Fan-coil structure and air conditioning system

Abstract

The application provides a fan coil structure and an air conditioning system. The fan coil structure comprises a coil water head structure, and the coil water head structure comprises: N header tanks and at least two branch pipes; at least two branch pipes between adjacent two header tanks are taken as a branch pipe group; two ends of at least two branch pipes in the same branch pipe group are respectively communicated with adjacent two header tanks; the N header tanks comprise adjacent (N-1)th header tank and Nth header tank, and the branch pipe group between the (N-1)th header tank and the Nth header tank is an (N-1)th branch pipe group; a first header tank is communicated with a plurality of heat exchange coils for heat exchange; and the Nth header tank is communicated with an external pipeline for circulating a heat exchange medium. The heat exchange medium is divided into the (N-1)th header tank through a plurality of branch pipes in the (N-1)th branch pipe group, the first header tank delivers the heat exchange medium into the plurality of heat exchange coils for heat exchange, N-1 times of division of the heat exchange medium is realized, and reasonable distribution of the heat exchange medium is ensured.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a fan coil unit structure and an air conditioning system. Background Technology

[0002] The fan coil unit structure in the surface cooler of an air conditioning system uses a heat exchange medium (such as chilled water) to cool the air flowing outside the coil. The fan drives the cooled air to the place of use for refrigeration. The chilled water flows inside the coil and returns through the return pipe to carry the absorbed heat back to the refrigeration unit, release the heat, cool down, and then is sent back to the coil to absorb heat and cool the air flowing outside the coil. This cycle continues to refrigerate.

[0003] In existing air conditioning systems, heat exchangers, including fan coil units, are common heat exchange structures that play a role in regulating indoor temperature. Fan coil units typically include components such as coils, fans, and manifolds. The manifolds are used to distribute and collect the heat exchange medium entering multiple coils connected in parallel, which directly affects the efficiency and energy consumption of the equipment.

[0004] However, existing fan coil unit structures typically use a claw-type water inlet at the water inlet (i.e., a manifold is used to connect to multiple parallel coils, and the manifold directly distributes water to multiple coils) to distribute water flow. The existing claw-type water inlet has certain limitations in water flow distribution. For example, the existing claw-type water inlet does not distribute the water flow evenly in multiple parallel coils, which prevents the internal piping of the heat exchanger from fully utilizing its heat dissipation performance, and thus directly reduces the heat exchange performance of the fan coil unit structure and the heat exchanger. Summary of the Invention

[0005] This invention provides a fan coil unit structure and an air conditioning system to solve the problem that the claw-type water inlet method in the prior art results in uneven water flow distribution, which in turn reduces the heat exchange performance of the fan coil unit structure.

[0006] To address the aforementioned problems, according to one aspect of the present invention, a fan coil unit structure is provided, comprising a coil head structure, the coil head structure including: N manifolds and at least two distribution pipes, where N ≥ 2 and N The number is a positive integer; at least two distribution pipes located between two adjacent manifolds form a distribution group, forming an N-1 distribution group; the two ends of at least two distribution pipes within the same distribution group are respectively connected to two adjacent manifolds; the N manifolds include the adjacent N-1th manifold and the Nth manifold, and the distribution group between the N-1th manifold and the Nth manifold is the N-1th distribution group; the first manifold is connected to multiple heat exchange coils for heat exchange; the Nth manifold is connected to an external pipeline for the flow of heat exchange medium; wherein, the Nth manifold, the N-1th manifold, the N-2th manifold, ..., the second manifold, and the first manifold are connected sequentially through distribution pipes; the heat exchange medium flows in from the Nth manifold, is diverted by at least two distribution pipes within the N-1th distribution group, and then enters the N-1th manifold, and the first manifold transports the heat exchange medium to multiple heat exchange coils for heat exchange.

[0007] Furthermore, within the first dispensing group, the central axis of the dispensing tube forms an angle with the central axis of the first manifold and the central axis of the second manifold; and / or, when N > 2, the connection position between at least one dispensing tube in the N-1 dispensing group and the N-1 manifold is closer to the middle of the N-1 manifold than the connection position between at least one dispensing tube in the N-2 dispensing group and the N-1 manifold.

[0008] Furthermore, when N is 2, the second manifold is connected to the external pipeline; the two ends of the liquid distribution pipe are connected to the first manifold and the second manifold respectively; at least two liquid distribution pipes are arranged at intervals along the axial direction of the second manifold; the heat exchange medium flows into the second manifold, and after being diverted by at least two liquid distribution pipes, it enters the first manifold.

[0009] Furthermore, when N is 2 and one external pipe is connected to the second manifold, the connection position between the second manifold and the external pipe is taken as the first position; along the axial direction of the second manifold, the connection positions of the two adjacent distribution pipes closest to the middle of the second manifold and the second manifold are respectively the third and fourth positions, and the first position is located between the third and fourth positions, so that the heat exchange medium diffuses and flows from the middle of the second manifold to both ends before entering the first manifold; when N is 2 and multiple external pipes are connected to the second manifold, along the axial direction of the second manifold, the connection position of the external pipe closest to one end of the second manifold and the second manifold is taken as the first position, and the connection position of the external pipe closest to the other end of the second manifold and the second manifold is taken as the second position; within the first distribution group, along the axial direction of the second manifold, the two adjacent distribution pipes closest to the middle of the second manifold... The connection positions with the second manifold are the third and fourth positions, respectively. The first and second positions are both located between the third and fourth positions, so that the heat exchange medium diffuses and flows from the middle of the second manifold to both ends before entering the first manifold. When N>2, in the second liquid distribution group, along the axial direction of the second manifold, the liquid distribution pipe closest to one end of the second manifold is connected to the second manifold at the first position, and the liquid distribution pipe closest to the other end of the second manifold is connected to the second manifold at the second position. In the first liquid distribution group, along the axial direction of the second manifold, the two adjacent liquid distribution pipes closest to the middle of the second manifold are connected to the second manifold at the third and fourth positions, respectively. The first and second positions are both located between the third and fourth positions, so that the heat exchange medium diffuses and flows from the middle of the second manifold to both ends before entering the first manifold.

[0010] Furthermore, along the axial direction of the first manifold, the connection position between the liquid distribution pipe closest to one end of the first manifold and the first manifold is the fifth position, and the connection position between the liquid distribution pipe closest to the other end of the first manifold and the first manifold is the sixth position; the connection positions between the two adjacent heat exchange coils closest to the middle of the first manifold and the first manifold are the seventh position and the eighth position, respectively; the fifth position and / or the sixth position are located between the seventh position and the eighth position, so that the heat exchange medium diffuses and flows from the middle of the first manifold to both ends and then enters the heat exchange coil.

[0011] Furthermore, the internal volume of the Nth manifold is taken as the Nth volume, and the total volume of the (N-1)th manifold to the first manifold is taken as the liquid distribution volume, wherein the Nth volume is greater than or equal to the liquid distribution volume; and / or, the ratio of the internal diameter of the Nth manifold to the internal diameter of the (N-1)th manifold is in the range of 1.5 to 2; and / or, the axial length of the (N-1)th manifold is greater than the axial length of the Nth manifold, and the two ends of the Nth manifold in the axial direction are located between the two ends of the (N-1)th manifold in the axial direction.

[0012] Furthermore, the fan coil unit structure also includes a drive fan and multiple heat exchange coils for heat exchange. The drive fan drives the airflow through the heat exchange coils so that the airflow and the heat exchange coils can exchange heat through convection.

[0013] Furthermore, the driving fan drives the airflow to form an airflow field, which includes adjacent dense airflow areas and loose airflow areas. The airflow density in the dense airflow areas is greater than that in the loose airflow areas. The number of heat exchange coils arranged in the dense airflow areas is greater than that in the loose airflow areas.

[0014] Furthermore, the fan coil unit structure also includes a housing, inside which there is a heat exchange cavity, and the housing also has an air inlet communicating with the heat exchange cavity; the drive fan is mounted on the housing and communicates with the air inlet to drive airflow from the air inlet into the heat exchange cavity; wherein, the coil head structure is located outside the heat exchange cavity, and at least a portion of the heat exchange coil is located inside the heat exchange cavity.

[0015] Furthermore, the heat exchange coil includes multiple connected straight pipes, the central axes of which are arranged in parallel and perpendicular to the air outlet direction of the driving fan. Along the air outlet direction of the driving fan, the multiple straight pipes, the airflow field, and the air inlet are projected onto a projection plane perpendicular to the air outlet direction. At least a portion of the projection of the air inlet is located within the projection of the airflow field. Within the projection plane, the overlapping portion of the air inlet projection and the airflow field is designated as the first region, the projection of the airflow field excluding the first region is designated as the second region, and the portion outside the projection of the airflow field is designated as the third region. The number of straight pipes in the first region is the first quantity, the number in the second region is the second quantity, and the number in the third region is the third quantity. The first quantity is greater than the second quantity, and the second quantity is greater than or equal to the third quantity.

[0016] Furthermore, the ratio of the first quantity to the second quantity to the third quantity is 4:3:2; or the ratio of the first quantity to the second quantity to the third quantity is 4:2:2.

[0017] Furthermore, multiple straight pipes form multiple heat exchange groups, and the central axes of multiple straight pipes in the same heat exchange group are arranged in the same plane; multiple heat exchange groups are arranged at intervals along the air outlet direction; wherein, at least a portion of the straight pipes in the same heat exchange group are arranged in parallel; and at least a portion of the projections of different heat exchange groups onto the projection plane along the air outlet direction overlap.

[0018] Furthermore, there are multiple coil head structures, and each coil head structure is connected to at least one heat exchange group.

[0019] Furthermore, there are multiple drive fans, which are spaced apart along the axial direction of the straight pipe; there are also multiple air inlets, which are arranged one-to-one with each of the drive fans.

[0020] According to another aspect of the present invention, an air conditioning system is provided, which includes the above-described fan coil unit structure.

[0021] Applying the technical solution of this invention, this invention provides a fan coil unit structure, including a coil head structure, wherein the coil head structure comprises: N manifolds and at least two distribution pipes, where N ≥ 2 and N The number is a positive integer; at least two distribution pipes located between two adjacent manifolds form a distribution group, forming an N-1 distribution group; the two ends of at least two distribution pipes within the same distribution group are respectively connected to two adjacent manifolds; the N manifolds include the adjacent N-1th manifold and the Nth manifold, and the distribution group between the N-1th manifold and the Nth manifold is the N-1th distribution group; the first manifold is connected to multiple heat exchange coils for heat exchange; the Nth manifold is connected to an external pipeline for the flow of heat exchange medium; wherein, the Nth manifold, the N-1th manifold, the N-2th manifold, ..., the second manifold, and the first manifold are connected sequentially through distribution pipes; the heat exchange medium flows in from the Nth manifold, is diverted by at least two distribution pipes within the N-1th distribution group, and then enters the N-1th manifold, and the first manifold transports the heat exchange medium to multiple heat exchange coils for heat exchange.

[0022] This invention utilizes at least N manifolds and at least two distribution pipes to work together. The heat exchange medium flows into the Nth manifold, is divided by multiple distribution pipes in the (N-1)th distribution group, and then enters the (N-1)th manifold. This continues until it is divided by the distribution pipes in the first distribution group and enters the first manifold. The first manifold then delivers the heat exchange medium to multiple heat exchange coils for heat exchange, achieving N-1 diversions of the heat exchange medium and ensuring its rational distribution. Compared to existing methods using claw-type inlet water distribution, the coil head structure proposed in this invention overcomes the limitations of the claw-type inlet method in water flow distribution, achieving a uniform distribution of the heat exchange medium flow in multiple parallel heat exchange coils. This allows the heat exchange coils to fully utilize their heat dissipation performance, directly improving the heat exchange performance of the fan coil structure. This invention improves the efficiency of subsequent air conditioning systems and effectively reduces energy consumption. The fan coil unit structure proposed in this invention eliminates the need for additional electric valves or other devices for heat exchange medium diversion control, ensuring uniform flow distribution and optimal operation of each heat exchange coil loop. Furthermore, the fan coil unit structure facilitates pressure drop in the heat exchange medium, thereby enhancing the stability and reliability of the air conditioning system. The optimized head structure significantly improves the heat exchange efficiency and operational stability of heat exchangers containing fan coil units, enabling uniform distribution of circulating water flow and effectively preventing localized overheating or overcooling, thus improving the overall performance of the air conditioning system. This invention is simple in structure and low in cost, easy to assemble and maintain, and has broad application prospects, making it suitable for large-scale promotion and use. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This diagram shows the external structure of the fan coil unit provided in an embodiment of the present invention.

[0025] Figure 2 This diagram shows a partially enlarged schematic of the external structure of the fan coil unit provided in an embodiment of the present invention;

[0026] Figure 3 A partial structural schematic diagram of a fan coil unit structure including two manifolds provided by an embodiment of the present invention is shown from a side view.

[0027] Figure 4 A partial structural schematic diagram of a fan coil unit structure including four manifolds provided by an embodiment of the present invention is shown from a side view.

[0028] Figure 5 This shows a partial structural schematic diagram of multiple straight tubes projected in a projection plane according to Embodiment 1 of the present invention;

[0029] Figure 6 This diagram illustrates a partial structural schematic of multiple straight tubes projected onto a projection plane, according to Embodiment 2 of the present invention.

[0030] The above figures include the following reference numerals:

[0031] 10. First manifold; 11. Fifth position; 12. Sixth position; 13. Seventh position; 14. Eighth position;

[0032] 20. Second manifold;

[0033] 30. Separating tube; 31. First separating group; 32. Second separating group; 33. Third separating group;

[0034] 40. Third manifold;

[0035] 50. Fourth collection pipe;

[0036] 60. Heat exchanger coil; 61. Straight tube;

[0037] 70. External piping;

[0038] 80. Drive the fan;

[0039] 90. Shell;

[0040] 101. First area; 102. Second area; 103. Third area. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1 to 6 As shown, an embodiment of the present invention provides a fan coil unit structure, including a coil head structure, the coil head structure comprising: N manifolds and at least two distribution pipes 30, where N ≥ 2 and N The value is a positive integer; at least two liquid distribution pipes 30 located between two adjacent manifolds form a liquid distribution group, forming an N-1 liquid distribution group; the two ends of at least two liquid distribution pipes 30 located in the same liquid distribution group are respectively connected to two adjacent manifolds; the N manifolds include the adjacent N-1th manifold and the Nth manifold, and the liquid distribution group between the N-1th manifold and the Nth manifold is the N-1th liquid distribution group; the first manifold 10 is connected to multiple heat exchange coils 60 for heat exchange; the Nth manifold is connected to an external pipeline 70 for the flow of heat exchange medium; wherein, the Nth manifold, the N-1th manifold, the N-2th manifold, ..., the second manifold 20, and the first manifold 10 are connected in sequence through liquid distribution pipes 30; the heat exchange medium flows in from the Nth manifold, is diverted by at least two liquid distribution pipes 30 in the N-1th liquid distribution group, and then enters the N-1th manifold, and the first manifold 10 transports the heat exchange medium to multiple heat exchange coils 60 for heat exchange.

[0043] This invention utilizes at least N manifolds and at least two distribution pipes 30 working in coordination. The heat exchange medium flows into the Nth manifold, is divided by multiple distribution pipes 30 within the (N-1)th distribution group, and then enters the (N-1)th manifold. Finally, it is divided by the distribution pipes 30 within the first distribution group 31 and enters the first manifold 10. The first manifold 10 then delivers the heat exchange medium to multiple heat exchange coils 60 for heat exchange, achieving N-1 diversions of the heat exchange medium and ensuring its rational distribution. Compared to existing methods using claw-type inlet water distribution, the coil head structure proposed in this invention overcomes the limitations of existing claw-type inlet methods in water flow distribution. It achieves a uniform distribution of the heat exchange medium flow within multiple parallel-connected heat exchange coils 60, allowing the heat exchange coils 60 to fully utilize their heat dissipation performance, thereby directly improving the fan coil structure. This invention improves heat exchange performance and enhances the efficiency of subsequent air conditioning systems while effectively reducing energy consumption. The proposed fan coil unit structure eliminates the need for additional electric valves or other devices for heat exchange medium distribution control, ensuring uniform flow distribution and optimal operation of each heat exchange coil loop. Furthermore, the proposed fan coil unit structure facilitates pressure drop in the heat exchange medium, thereby improving the stability and reliability of the air conditioning system. The optimized head structure significantly improves the heat exchange efficiency and operational stability of heat exchangers containing fan coil units, enabling uniform distribution of circulating water flow and effectively preventing localized overheating or overcooling, thus enhancing the overall performance of the air conditioning system. This invention is simple in structure and low in cost, easy to assemble and maintain, and has broad application prospects, making it suitable for large-scale promotion and use.

[0044] It should be noted that: such as Figure 4 As shown, in a specific embodiment of the present invention, N=4, and the four manifolds include a first manifold 10, a second manifold 20, a third manifold 40, and a fourth manifold 50 that are sequentially adjacent to each other. Multiple distribution pipes 30 between two adjacent manifolds form a distribution group, resulting in three distribution groups: a first distribution group 31, a second distribution group 32, and a third distribution group 33. Each distribution group includes four distribution pipes 30. The first manifold 10 is connected to multiple heat exchange coils 60 used for heat exchange. The fourth manifold 50... It is connected to an external pipeline 70 for circulating heat exchange medium; wherein, the heat exchange medium flows into the fourth manifold 50 through the external pipeline 70, is divided by the four distribution pipes 30 in the third distribution group 33 and enters the third manifold 40, is divided by the four distribution pipes 30 in the second distribution group 32 and enters the second manifold 20, until it is divided by the four distribution pipes 30 in the first distribution group 31 and enters the first manifold 10, and the first manifold 10 delivers the heat exchange medium to multiple heat exchange coils 60 for heat exchange.

[0045] like Figure 1 , Figure 2, Figure 3 and Figure 4 As shown, within the first liquid distribution group 31, the central axis of the liquid distribution tube 30 forms an angle with the central axis of the first manifold 10 and the central axis of the second manifold 20.

[0046] By setting the central axis of the distribution pipe 30 in the first distribution group 31 to form an angle with the central axis of the first manifold 10 and the second manifold 20, it helps to improve the uniformity of fluid distribution and further improves the heat exchange efficiency. The angle design allows the heat exchange medium to fill the first manifold 10 and the second manifold 20 as much as possible, thereby improving the uniformity of heat exchange medium distribution.

[0047] In one specific embodiment of the present invention, the central axis of the first manifold 10 is parallel to the central axis of the second manifold 20, and the central axis of the first manifold 10 is perpendicular to the central axis of the liquid separator 30.

[0048] When N > 2, the connection position between at least one dispensing tube 30 in the N-1 dispensing group and the N-1 manifold is closer to the middle of the N-1 manifold than the connection position between at least one dispensing tube 30 in the N-2 dispensing group and the N-1 manifold.

[0049] By setting the connection position between the liquid distribution pipe 30 and the manifold in each liquid distribution group as described above, the distribution of the heat exchange medium in the manifold can be controlled, promoting the diffusion and flow of the heat exchange medium from the middle to both ends of the manifold, thereby ensuring the uniformity of the heat exchange medium flow rate in each heat exchange coil 60, improving the heat exchange efficiency, and making the heat exchange medium in the heat exchange coil 60 effectively pressure drop.

[0050] like Figure 1 , Figure 2 and Figure 3 As shown, when N is 2, the second manifold 20 is connected to the external pipeline 70; the two ends of the liquid distribution pipe 30 are connected to the first manifold 10 and the second manifold 20 respectively; at least two liquid distribution pipes 30 are arranged at intervals along the axial direction of the second manifold 20; the heat exchange medium flows into the second manifold 20, and after being diverted by at least two liquid distribution pipes 30, it enters the first manifold 10.

[0051] When N equals 2, the connection between the second manifold 20 and the external pipe 70 ensures that the flow rate of the heat exchange medium (e.g., water) from the second manifold 20 to the first manifold 10 can be evenly distributed, thus improving the heat exchange performance. In addition, this design reduces the flow resistance in the head structure, improves the efficiency of heat exchange medium circulation, and simplifies the structure, making it easier to manufacture and maintain.

[0052] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, when N is 2 and one external pipe 70 is connected to the second manifold 20, the connection position between the second manifold 20 and the external pipe 70 is taken as the first position; along the axial direction of the second manifold 20, the connection positions of the two adjacent distribution pipes 30 closest to the middle of the second manifold 20 and the second manifold 20 are respectively the third and fourth positions, and the first position is located between the third and fourth positions, so that the heat exchange medium diffuses from the middle of the second manifold 20 to both ends and then enters the first manifold 10; when N is 2 and multiple external pipes 70 are connected to the second manifold 20, along the axial direction of the second manifold 20, The connection position between the external pipe 70 closest to one end of the second manifold 20 and the second manifold 20 is the first position, and the connection position between the external pipe 70 closest to the other end of the second manifold 20 and the second manifold 20 is the second position; within the first liquid distribution group 31, along the axial direction of the second manifold 20, the connection positions between the two adjacent liquid distribution pipes 30 closest to the middle of the second manifold 20 and the second manifold 20 are the third position and the fourth position, respectively. The first position and the second position are both located between the third position and the fourth position, so that the heat exchange medium diffuses and flows from the middle of the second manifold 20 to both ends before entering the first manifold 10; Figure 4 As shown, when N > 2, within the second liquid distribution group 32, along the axial direction of the second manifold 20, the liquid distribution pipe 30 closest to one end of the second manifold 20 is connected to the second manifold 20 at the first position, and the liquid distribution pipe 30 closest to the other end of the second manifold 20 is connected to the second manifold 20 at the second position; within the first liquid distribution group 31, along the axial direction of the second manifold 20, the two adjacent liquid distribution pipes 30 closest to the middle of the second manifold 20 are connected to the second manifold 20 at the third and fourth positions, respectively. The first and second positions are both located between the third and fourth positions, so that the heat exchange medium diffuses and flows from the middle of the second manifold 20 to both ends before entering the first manifold 10.

[0053] For cases where N equals 2 and N is greater than 2, by precisely positioning the connection between the distributor 30 and the manifold, the distribution of the heat exchange medium in the manifold can be controlled, promoting the diffusion and flow of the heat exchange medium from the middle to both ends of the second manifold 20. This ensures the uniformity of the heat exchange medium flow rate in each heat exchange coil 60, improves the heat exchange efficiency, and effectively reduces the pressure of the heat exchange medium in the heat exchange coil 60.

[0054] like Figure 3As shown, along the axial direction of the first manifold 10, the liquid distribution pipe 30 closest to one end of the first manifold 10 is connected to the first manifold 10 at position 5 11, and the liquid distribution pipe 30 closest to the other end of the first manifold 10 is connected to the first manifold 10 at position 6 12; the two adjacent heat exchange coils 60 closest to the middle of the first manifold 10 are connected to the first manifold 10 at positions 7 13 and 8 14, respectively; position 5 11 and / or position 6 12 are located between position 7 13 and position 8 14, so that the heat exchange medium diffuses from the middle of the first manifold 10 to both ends and then enters the heat exchange coil 60.

[0055] By setting the connection position between the liquid distribution pipe 30 and the first manifold 10 inside the first manifold 10, it can be ensured that the heat exchange medium diffuses and flows from the middle to both ends of the first manifold 10, which not only ensures the uniformity of flow distribution, but also helps to improve the heat exchange efficiency of the heat exchange coil 60 located in the middle of the heat exchange cavity.

[0056] Specifically, the internal volume of the Nth manifold is taken as the Nth volume, and the total volume of the (N-1)th manifold to the first manifold 10 is taken as the liquid distribution volume, and the Nth volume is greater than or equal to the liquid distribution volume; and / or, the ratio of the internal diameter of the Nth manifold to the internal diameter of the (N-1)th manifold is in the range of 1.5 to 2; and / or, the axial length of the (N-1)th manifold is greater than the axial length of the Nth manifold, and the two ends of the Nth manifold in the axial direction are located between the two ends of the (N-1)th manifold in the axial direction.

[0057] By setting the volume, diameter ratio, and length of the Nth manifold, more efficient water flow distribution can be achieved. This design helps control fluid pressure and flow, thereby improving heat exchange performance. At the same time, since no additional electric valves are needed to regulate the flow, energy consumption can also be reduced.

[0058] like Figure 1 and Figure 2 As shown, the fan coil unit structure also includes a drive fan 80 and multiple heat exchange coils 60 for heat exchange. The drive fan 80 drives the airflow through the heat exchange coils 60 so that the airflow and the heat exchange coils 60 can perform convective heat exchange.

[0059] The fan coil structure proposed in this invention, which combines a coil head structure, a drive fan 80, and multiple heat exchange coils 60, can more effectively utilize airflow for convective heat exchange, thereby improving heat exchange efficiency and energy utilization efficiency.

[0060] Specifically, the drive fan 80 drives the airflow to form an airflow field, which includes adjacent dense airflow areas and loose airflow areas. The airflow density in the dense airflow area is greater than that in the loose airflow area. The number of heat exchange coils 60 arranged in the dense airflow area is greater than that in the loose airflow area.

[0061] By optimizing the airflow field design, the heat exchange coils 60 are arranged reasonably in the dense airflow area and the loose airflow area. This increases the number of heat exchange coils 60 in the dense airflow area and improves the heat exchange efficiency in the high airflow area. This design improves the overall heat exchange capacity of the equipment without increasing the additional energy consumption.

[0062] like Figure 1 and Figure 2 As shown, the fan coil unit structure also includes a housing 90, which has a heat exchange cavity inside and an air inlet communicating with the heat exchange cavity. A drive fan 80 is mounted on the housing 90 and communicates with the air inlet to drive airflow from the air inlet into the heat exchange cavity. The coil head structure is located outside the heat exchange cavity, and at least a portion of the heat exchange coil 60 is located inside the heat exchange cavity.

[0063] By connecting the air inlet on the housing 90 with the drive fan 80, the airflow path is optimized, the uniformity of airflow distribution is improved, and the heat exchange efficiency is further enhanced. This design also simplifies the fan coil unit structure and improves the convenience of subsequent fan coil unit installation and maintenance in the air conditioning system.

[0064] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the heat exchange coil 60 includes multiple connected straight pipes 61, with their central axes arranged in parallel and perpendicular to the air outlet direction of the drive fan 80. Along the air outlet direction of the drive fan 80, the multiple straight pipes 61, the airflow field, and the air inlet are projected onto a projection plane perpendicular to the air outlet direction. At least a portion of the projection of the air inlet is located within the projection of the airflow field. Within the projection plane, the overlapping portion of the air inlet projection and the airflow field is designated as the first region 101, the projection of the airflow field excluding the first region 101 is designated as the second region 102, and the portion outside the projection of the airflow field is designated as the third region 103. The number of straight pipes 61 within the first region 101 is the first number, the number within the second region 102 is the second number, and the number within the third region 103 is the third number. The first number is greater than the second number, and the second number is greater than or equal to the third number.

[0065] The layout design of the straight tube 61 ensures effective heat exchange between the airflow dense area and the straight tube 61. At the same time, by overlapping and controlling the number on the projection plane, the heat exchange performance of the entire device is optimized. The design also utilizes the natural distribution law of airflow to improve overall energy efficiency.

[0066] like Figure 5 As shown, the ratio of the first quantity to the second quantity to the third quantity is 4:3:2; or, as... Figure 6As shown, the ratio of the first quantity to the second quantity to the third quantity is 4:2:2.

[0067] By controlling the proportion of straight pipes 61 in different areas, the heat exchange efficiency can be further optimized. This design has the most straight pipes 61 in the first area 101, followed by the second area 102, and the fewest in the third area 103. It not only makes full use of the heat exchange capacity of the high air volume area, but also takes into account the heat exchange needs of the low air volume area, thereby improving the overall heat exchange effect.

[0068] In one specific embodiment of the present invention, in practical applications, the number of pipelines can be decreased using an arithmetic sequence, such as... Figure 5 and Figure 6 As shown, along the direction from inside the first region 101 to outside the second region 102 and / or along the direction from inside the second region 102 to outside the third region 103, the number of straight pipes 61 is reduced by utilizing the decreasing law of an arithmetic sequence, so that the change in the number of straight pipes 61 corresponds to the change law of airflow in the airflow field, thereby improving the overall heat exchange efficiency.

[0069] It should also be noted that the heat exchange coil 60 in this invention is arranged in a meandering pattern to increase the heat exchange area and improve the heat exchange efficiency; it includes a technical solution in which a portion of the multiple straight tubes 61 in the heat exchange coil 60 are connected in series, and a technical solution in which a portion of the multiple straight tubes 61 are connected in parallel; specific embodiments are as follows:

[0070] 1. Technical solution for multiple straight pipes 61 connected in series:

[0071] Multiple straight pipes 61 form a multi-stage series structure; a portion of the heat exchange coil 60 is composed of multiple straight pipes 61 connected in series, with each straight pipe 61 connected at both ends by bends, forming a meandering and coiled structure; this series connection increases the fluid path length, thereby increasing the heat exchange surface area and improving heat exchange efficiency; multiple series-connected straight pipes 61 form a circulation path, and through a carefully designed series path, the fluid is guided through each set of straight pipes 61 of the heat exchange coil 60, forming a continuous circulation path. This design ensures uniform distribution of the heat exchange medium, and in the air conditioning system, it ensures that the fluid passes through each heat exchange coil 60, thereby optimizing the heat exchange performance of the entire system;

[0072] Multiple straight tubes 61 form a zoned series structure. Multiple straight tubes 61 in the same zone are connected in series, while multiple straight tubes 61 in different zones are connected in parallel. It can be designed such that there are more series connections between multiple straight tubes 61 in dense airflow zones and fewer series connections in loose airflow zones. This design can provide more heat exchange area in high airflow zones and reduce the number of heat exchange coils 60 in low airflow zones, thereby balancing the heat exchange efficiency and pressure drop of the entire heat exchanger.

[0073] 2. Technical solution for multiple straight pipes connected in parallel:

[0074] The heat exchange coil 60 can be composed of multiple straight pipes 61 connected in parallel. The straight pipes 61 in each group are connected in parallel to form an independent heat exchange loop. This design allows multiple straight pipes 61 in the same heat exchange group to be set in parallel. In air conditioning systems, this parallel grouping can achieve rapid fluid distribution, improve heat exchange efficiency, and reduce the overall system pressure drop. In the parallel grouping design, the heat exchange efficiency of the heat exchange coil 60 can be optimized by controlling the fluid pressure and flow rate on each parallel path. Combined with the ratio of the internal diameter of the Nth manifold to the internal diameter of the (N-1)th manifold being in the range of 1.5 to 2, this design helps to control the distribution of fluid in the parallel path, thereby increasing the contact area between the fluid and the pipe wall and optimizing the heat exchange efficiency.

[0075] Furthermore, it can be designed so that the number of straight tubes 61 is the largest in the dense airflow area, the second largest in the loose airflow area, and the smallest in the inefficient area. This parallel structure with regional settings can ensure rapid heat exchange of fluid in the high airflow area, while reducing the number of heat exchange coils 60 in the inefficient area, thereby balancing system performance and energy efficiency.

[0076] Through the detailed description of the above embodiments, it can be seen that the heat exchange coil 60 is specifically arranged in a meandering manner. Whether multiple straight tubes 61 are connected in series or in parallel, the heat exchange area can be effectively increased and the heat exchange efficiency can be improved. At the same time, the layout of the heat exchange coil 60 is optimized according to the airflow distribution, balancing the system performance and energy efficiency. Of course, in practical applications, the structure of multiple straight tubes 61 connected in series or in parallel can be combined and adjusted according to specific heat exchange requirements to achieve the optimal heat exchange effect.

[0077] like Figure 5 and Figure 6 As shown, multiple straight pipes 61 form multiple heat exchange groups, and the central axes of multiple straight pipes 61 in the same heat exchange group are arranged in the same plane; multiple heat exchange groups are arranged at intervals along the air outlet direction; wherein, at least a portion of the straight pipes 61 in the same heat exchange group are arranged in parallel; at least a portion of the projections of different heat exchange groups onto the projection plane along the air outlet direction overlap.

[0078] By dividing the straight tubes 61 into multiple heat exchange groups, with each group arranged coplanarly, the structural stability and heat exchange capacity of the equipment can be enhanced while maintaining heat exchange efficiency. By setting the straight tubes 61 in the same heat exchange group to be connected in parallel, the path of the heat exchange medium can be increased, thereby optimizing fluid distribution and improving heat exchange efficiency.

[0079] Specifically, such as Figure 1 and Figure 2 As shown, there are multiple coil head structures, and each coil head structure is connected to at least one heat exchange group.

[0080] This configuration improves the flexibility and scalability of the fan coil unit structure, allowing for adjustments to the number and layout of heat exchange units based on different heat exchange needs, thereby achieving more efficient and wider heat exchange.

[0081] like Figure 1 and Figure 2 As shown, there are multiple drive fans 80, which are spaced apart along the axial direction of the straight pipe 61; there are multiple air inlets, which are arranged one-to-one with the multiple drive fans 80.

[0082] By setting up multiple air inlets and multiple drive fans 80 in a one-to-one correspondence, the uniform distribution of airflow in the heat exchange chamber can be ensured, further improving the convective heat transfer efficiency.

[0083] The present invention also provides an air conditioning system, which includes the above-described fan coil unit structure.

[0084] The air conditioning system proposed in this invention can provide a more efficient and energy-saving air temperature regulation solution. It can ensure that the air conditioning system can maintain good heat exchange efficiency and air circulation under different environmental conditions, thereby improving the comfort of the indoor environment and the overall energy efficiency of the system, thus providing a more efficient and energy-saving technical solution for air conditioning systems.

[0085] The working process and principle of a specific embodiment of the present invention will now be described in detail as follows:

[0086] like Figure 1 , Figure 2 and Figure 3 As shown, this application forms a double manifold structure through structural design, which can redistribute water flow without the need to add additional electric valves or other equipment. This design allows the heat exchange coil 60 of the heat exchanger to fully utilize its performance advantages. Furthermore, by setting the number of straight pipes 61 in different areas, the pipes with poor heat dissipation performance can be redistributed, avoiding the problem of further efficiency reduction due to uneven water flow distribution.

[0087] In a specific embodiment of the present invention, the total height of the fan coil unit structure is 210mm, the distance between the upper end of the air inlet and the upper sheet metal part of the shell 90 is 20mm, and the overall height of the air inlet is 90mm. At this point, the dense airflow zone is located in the upper middle part of the fan coil unit structure of the heat exchanger, making the top and bottom of the fan coil unit structure loose airflow zones, with less direct airflow within these zones. To improve the heat exchange efficiency of both the dense and loose airflow zones, the design of the heat exchange coil 60 references... Figure 5 or Figure 6The branching layout places the most straight pipes 61 in the first area 101 (i.e., the air inlet), the middle number of straight pipes 61 in the second area 102 (i.e., the middle part of the heat exchange chamber), and the minimum number of straight pipes 61 in the third area 103 (i.e., the inefficient area of ​​the air outlet, where the air volume is small) to increase the overall heat exchange efficiency.

[0088] In summary, this invention provides a fan coil unit structure and air conditioning system. By cooperating with at least N manifolds and at least two distribution pipes 30, the heat exchange medium flows into the Nth manifold, is diverted by multiple distribution pipes 30 within the N-1th distribution group, and then enters the N-1th manifold. Finally, after being diverted by the distribution pipes 30 within the first distribution group 31, it enters the first manifold 10. The first manifold 10 delivers the heat exchange medium to multiple heat exchange coils 60 for heat exchange, achieving N-1 diversions of the heat exchange medium and ensuring its rational distribution. Compared to existing methods using claw-type water inlets for water distribution, the fan coil unit structure proposed in this invention overcomes the limitations of existing claw-type water inlets in water flow distribution, achieving a uniform distribution of the heat exchange medium flow within multiple parallel-connected heat exchange coils 60. This allows the heat exchange coils 60 to fully utilize their heat dissipation performance. This invention directly improves the heat exchange performance of the fan coil unit structure, while also increasing the efficiency of the subsequent air conditioning system and effectively reducing energy consumption. The fan coil unit structure proposed in this invention eliminates the need for additional electric valves or other devices for heat exchange medium distribution control, ensuring uniform flow distribution and optimal operation of each heat exchange coil loop. Furthermore, the proposed fan coil unit structure facilitates pressure drop in the heat exchange medium, thereby improving the stability and reliability of the air conditioning system. The optimized head structure significantly improves the heat exchange efficiency and operational stability of the heat exchanger containing the fan coil unit structure, enabling uniform distribution of circulating water flow and effectively preventing localized overheating or undercooling, thus enhancing the overall performance of the air conditioning system. This invention is simple in structure and low in cost, easy to assemble and maintain, and has broad application prospects, making it suitable for large-scale promotion and use.

[0089] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0090] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0091] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0092] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0093] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fan coil unit structure, characterized in that, The system includes a coil head structure, comprising: N manifolds and at least two distribution pipes (30), where N ≥ 2 and N is a positive integer; at least two distribution pipes (30) located between two adjacent manifolds form a distribution group, forming N-1 distribution groups; the two ends of at least two distribution pipes (30) located in the same distribution group are respectively connected to two adjacent manifolds; the N manifolds include adjacent N-1th manifolds and Nth manifolds, and the distribution group between the N-1th manifold and the Nth manifold is the N-1th distribution group; the first manifold (10) is connected to a plurality of heat exchange coils (60) for heat exchange; the N-1th manifold is connected to the Nth manifold. The manifold is connected to an external pipeline (70) for the flow of heat exchange medium; wherein the Nth manifold, the N-1th manifold, the N-2th manifold, ..., the second manifold (20), and the first manifold (10) are connected in sequence through the liquid distribution pipe (30); the heat exchange medium flows in from the Nth manifold, is diverted by at least two of the liquid distribution pipes (30) in the N-1 liquid distribution group, and then enters the N-1th manifold; the first manifold (10) transports the heat exchange medium to multiple heat exchange coils (60) for heat exchange.

2. The fan coil unit structure according to claim 1, characterized in that, Within the first liquid distribution group (31), the central axis of the liquid distribution tube (30) forms an angle with the central axis of the first manifold (10) and the central axis of the second manifold (20); and / or, when N>2, the connection position of at least one liquid distribution tube (30) in the N-1 liquid distribution group with the N-1 manifold is closer to the middle of the N-1 manifold than the connection position of at least one liquid distribution tube (30) in the N-2 liquid distribution group with the N-1 manifold.

3. The fan coil unit structure according to claim 1, characterized in that, When N is 2, the second manifold (20) is connected to the external pipeline (70); the two ends of the liquid distribution pipe (30) are connected to the first manifold (10) and the second manifold (20) respectively; at least two liquid distribution pipes (30) are arranged at intervals along the axial direction of the second manifold (20); the heat exchange medium flows into the second manifold (20), and after being diverted by at least two liquid distribution pipes (30), it enters the first manifold (10).

4. The fan coil unit structure according to claim 1, characterized in that, When N is 2 and one of the external pipes (70) is connected to the second manifold (20), the connection position between the second manifold (20) and the external pipe (70) is taken as the first position; along the axial direction of the second manifold (20), the connection positions between the two adjacent liquid distribution pipes (30) closest to the middle of the second manifold (20) and the second manifold (20) are respectively the third position and the fourth position, and the first position is located between the third position and the fourth position, so that the heat exchange medium diffuses from the middle of the second manifold (20) to both ends and then enters the first manifold (10); When N is 2 and multiple external pipes (70) are connected to the second manifold (20), the connection position of the external pipe (70) closest to one end of the second manifold (20) along the axial direction of the second manifold (20) is the first position, and the connection position of the external pipe (70) closest to the other end of the second manifold (20) is the second position; within the first liquid distribution group (31), the connection positions of the two adjacent liquid distribution pipes (30) closest to the middle of the second manifold (20) along the axial direction of the second manifold (20) are the third position and the fourth position, respectively. The first position and the second position are both located between the third position and the fourth position, so that the heat exchange medium diffuses and flows from the middle of the second manifold (20) to both ends and then enters the first manifold (10); When N > 2, in the second liquid distribution group (32), along the axial direction of the second manifold (20), the liquid distribution pipe (30) closest to one end of the second manifold (20) is connected to the second manifold (20) at the first position, and the liquid distribution pipe (30) closest to the other end of the second manifold (20) is connected to the second manifold (20) at the second position; in the first liquid distribution group (31), along the axial direction of the second manifold (20), the two adjacent liquid distribution pipes (30) closest to the middle of the second manifold (20) are connected to the second manifold (20) at the third and fourth positions, respectively. The first position and the second position are both located between the third position and the fourth position, so that the heat exchange medium diffuses and flows from the middle of the second manifold (20) to both ends and then enters the first manifold (10).

5. The fan coil unit structure according to claim 1, characterized in that, Along the axial direction of the first manifold (10), the liquid distribution pipe (30) closest to one end of the first manifold (10) is connected to the first manifold (10) at the fifth position (11), and the liquid distribution pipe (30) closest to the other end of the first manifold (10) is connected to the first manifold (10) at the sixth position (12); the two adjacent heat exchange coils (60) closest to the middle of the first manifold (10) are connected to the first manifold (10) at the seventh position (13) and the eighth position (14), respectively; the fifth position (11) and / or the sixth position (12) are located between the seventh position (13) and the eighth position (14) so ​​that the heat exchange medium diffuses from the middle of the first manifold (10) to both ends and then enters the heat exchange coil (60).

6. The fan coil unit structure according to claim 1, characterized in that, The internal volume of the Nth manifold is taken as the Nth volume, and the total volume of the N-1th manifold to the first manifold (10) is taken as the liquid distribution volume, wherein the Nth volume is greater than or equal to the liquid distribution volume; And / or, the ratio of the inner diameter of the Nth manifold to the inner diameter of the (N-1)th manifold is in the range of 1.5 to 2; And / or, the axial length of the (N-1)th manifold is greater than the axial length of the Nth manifold, and the two ends of the Nth manifold in the axial direction are located between the two ends of the (N-1)th manifold in the axial direction.

7. The fan coil unit structure according to claim 1, characterized in that, The fan coil structure also includes a drive fan (80) and a plurality of heat exchange coils (60) for heat exchange. The drive fan (80) drives the airflow through the heat exchange coils (60) so that the airflow and the heat exchange coils (60) can exchange heat through convection.

8. The fan coil unit structure according to claim 7, characterized in that, The driving fan (80) drives the airflow to form an airflow field, which includes adjacent dense airflow areas and loose airflow areas. The airflow density in the dense airflow area is greater than the airflow density in the loose airflow area. The number of heat exchange coils (60) arranged in the dense airflow area is greater than the number arranged in the loose airflow area.

9. The fan coil unit structure according to claim 8, characterized in that, The fan coil structure also includes a housing (90), which has a heat exchange cavity inside and an air inlet communicating with the heat exchange cavity. The driving fan (80) is disposed on the housing (90) and communicates with the air inlet to drive the airflow from the air inlet into the heat exchange cavity. The coil head structure is located outside the heat exchange cavity, and at least a portion of the heat exchange coil (60) is located inside the heat exchange cavity.

10. The fan coil unit structure according to claim 9, characterized in that, The heat exchange coil (60) includes multiple connected straight tubes (61), the central axes of which are arranged in parallel, and the central axes of the straight tubes (61) are perpendicular to the air outlet direction of the drive fan (80); along the air outlet direction of the drive fan (80), the multiple straight tubes (61), the airflow field, and the air inlet are projected onto a projection plane perpendicular to the air outlet direction, and at least a portion of the projection of the air inlet is located within the projection of the airflow field; within the projection plane, the projection of the air inlet and the... The overlapping part of the airflow field is the first region (101), the projection of the airflow field outside the first region (101) is the second region (102), and the part outside the projection of the airflow field is the third region (103). The number of the straight pipes (61) in the first region (101) is the first number, the number in the second region (102) is the second number, and the number in the third region (103) is the third number. The first number is greater than the second number, and the second number is greater than or equal to the third number.

11. The fan coil unit structure according to claim 10, characterized in that, The ratio of the first quantity to the second quantity to the third quantity is 4:3:2; Alternatively, the ratio of the first quantity to the second quantity to the third quantity is 4:2:

2.

12. The fan coil unit structure according to claim 10, characterized in that, Multiple straight pipes (61) form multiple heat exchange groups, and the central axes of multiple straight pipes (61) in the same heat exchange group are arranged in the same plane; multiple heat exchange groups are arranged at intervals along the air outlet direction; wherein, at least a portion of the straight pipes (61) in the same heat exchange group are arranged in parallel; at least a portion of the projections of different heat exchange groups onto the projection plane along the air outlet direction overlap.

13. The fan coil unit structure according to claim 12, characterized in that, There are multiple coil head structures, and each coil head structure is connected to at least one heat exchange group.

14. The fan coil unit structure according to claim 10, characterized in that, There are multiple drive fans (80), and the multiple drive fans (80) are arranged at intervals along the axial direction of the straight pipe (61); there are multiple air inlets, and the multiple air inlets are arranged one-to-one with the multiple drive fans (80).

15. An air conditioning system, characterized in that, The air conditioning system includes the fan coil unit structure as described in any one of claims 1 to 14.

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