Fan coil, air conditioner indoor unit and heating and ventilation system

Abstract

The invention discloses a fan coil, an air conditioner indoor unit and a heating and ventilation system.The fan coil is applied to the air conditioner indoor unit and comprises a heat exchanger and a liquid distributing and collecting device; the heat exchanger comprises a heat exchange tube which is a flexible stainless steel tube; the liquid distributing and collecting device comprises a shell, the shell is provided with a liquid inlet cavity and a liquid outlet cavity which are independent of each other, the liquid inlet cavity is used for distributing liquid to the heat exchange pipes, the liquid outlet cavity is used for collecting the liquid of the heat exchange pipes, the shell is provided with a plurality of pipe passing holes, and the pipe passing holes communicate with the liquid inlet cavity and the liquid outlet cavity correspondingly. The heat exchange tube is arranged in the heat exchange tube in a penetrating manner; a first step part is arranged on the hole wall of the pipe passing hole, the heat exchange pipe is provided with a second step part, and the first step part is matched with the second step part in an abutting mode so as to limit the heat exchange pipe to move in the axial direction of the pipe passing hole. According to the technical scheme, the installation efficiency of the water distributing and collecting device and the heat exchange pipe in the fan coil can be improved.

Description

Technical Field

[0001] This application relates to the technical field of heating, ventilation, and air conditioning equipment, and particularly relates to a fan coil unit, an air conditioner indoor unit, and a heating, ventilation, and air conditioning system. Background Art

[0002] Currently, as the terminal equipment of a heating, ventilation, and air conditioning system, an air conditioner indoor unit is mainly used to adjust the temperature, humidity, and cleanliness of indoor air. Among them, the fan coil unit in the air conditioner indoor unit is widely used in places such as hotels, office buildings, and hospitals due to its compact structure and various installation methods. Among them, the water distributor in the fan coil unit, as a core component, mainly distributes the cold water or hot water transmitted in the heating, ventilation, and air conditioning system to the indoor heat exchanger, and then the indoor heat exchanger exchanges heat with the indoor air.

[0003] In related technologies, when a fan coil unit shunts and integrates the fluid circulating inside it, a metal water collecting head is usually used. Multiple water outlet branch pipes and water inlet branch pipes are bent and welded on the existing metal water collecting head, and then both the water outlet branch pipes and the water inlet branch pipes (collectively referred to as branch pipes below) are connected to the heat exchanger. The complex pipeline connections formed by multiple branch pipes require additional space to be reserved. During installation, on-site welding or assembly is required, and the pipeline orientation and connection angle need to be adjusted multiple times. This not only increases the installation time but also easily leads to installation errors, and it is extremely inconvenient during the installation process with the indoor heat exchanger, resulting in a low overall installation efficiency. Summary of the Invention

[0004] The embodiments of this application provide a fan coil unit, an air conditioner indoor unit, and a heating, ventilation, and air conditioning system, which can improve the installation efficiency of the water distributor and the heat exchange pipe in the fan coil unit.

[0005] In a first aspect, the embodiments of this application provide a fan coil unit, which is applied to an air conditioner indoor unit. The fan coil unit includes a heat exchanger and a liquid distributor; the heat exchanger includes heat exchange pipes, and the heat exchange pipes are flexible stainless steel pipes; the liquid distributor includes a housing, the housing has an independent liquid inlet chamber and a liquid outlet chamber, the liquid inlet chamber is used to shunt the liquid to a plurality of the heat exchange pipes, the liquid outlet chamber is used to collect the liquid of the plurality of the heat exchange pipes, the housing has a plurality of pipe passing holes, the plurality of pipe passing holes are respectively communicated with the liquid inlet chamber and the liquid outlet chamber, and are used for the heat exchange pipes to pass through; a first step portion is provided on the hole wall of the pipe passing hole, and a second step portion is provided on the heat exchange pipe, and the first step portion and the second step portion are in abutting cooperation to limit the axial movement of the heat exchange pipe along the pipe passing hole.

[0006] In some of these embodiments, each of the heat exchange pipes includes:

[0007] A main body section; and

[0008] The perforated section is connected and in communication with the main body section. The perforated sections are inserted into the through holes one by one, and the second stepped portion is provided on the perforated section.

[0009] In some embodiments, the perforated section includes:

[0010] A first pipe section, which is in communication with the main body section; and

[0011] A second pipe section, which is in communication with the first pipe section. The diameter of the second pipe section is larger than that of the first pipe section, so that the second stepped portion is configured on the perforated section, and a second stepped surface is configured between the first pipe section and the second pipe section.

[0012] In some embodiments, the through hole includes:

[0013] A first hole section for the first pipe section to pass through; and

[0014] A second hole section for the second pipe section to pass through. The diameter of the second hole section is larger than that of the first hole section, so that the first stepped portion is configured on the through hole, and a first stepped surface is configured between the first hole section and the second hole section.

[0015] In some embodiments, the first stepped surface extends horizontally or obliquely upward along the direction close to the central axis of the perforated section; and / or,

[0016] The second stepped surface extends horizontally or obliquely downward along the direction away from the central axis of the perforated section.

[0017] In some embodiments, the first stepped surface and the second stepped surface are arranged parallel to each other.

[0018] In some embodiments, the through hole further includes:

[0019] A flared hole section, which is connected to one end of the second hole section away from the first hole section and is flared along the direction away from the second hole section;

[0020] The perforated section includes:

[0021] A flared pipe section, which is connected to one end of the second pipe section away from the first pipe section and is flared along the direction away from the second hole section. The flared pipe section is arranged in the flared hole section.

[0022] In some embodiments, the housing includes:

[0023] An upper cover;

[0024] A lower cover, connected to the upper cover, with a plurality of through holes formed therethrough; and

[0025] A seal, at least partially located between the upper cover and the lower cover, configured with the upper cover to define the liquid inlet chamber and the liquid outlet chamber, the seal being provided with a plurality of liquid through holes, the liquid through holes being in one-to-one correspondence and communication with the through holes.

[0026] In some embodiments, it further includes:

[0027] A conducting member, disposed in the liquid inlet chamber and configured to conduct the two heat exchange tubes in the liquid inlet chamber, and / or disposed in the liquid outlet chamber and configured to conduct the two heat exchange tubes in the liquid outlet chamber; and

[0028] A partition member, disposed on the upper cover or the lower cover, and cooperating with the upper cover and the lower cover to define the liquid inlet chamber and the liquid outlet chamber;

[0029] Wherein, the conducting member is disposed on at least one of the upper cover, the lower cover, and the partition member.

[0030] In some embodiments, the partition member divides the internal space enclosed by the upper cover and the lower cover into the liquid inlet chamber and the liquid outlet chamber along a horizontal direction or a vertical direction.

[0031] In some embodiments, the conducting member includes:

[0032] A first conducting member, disposed in the liquid inlet chamber, configured to conduct the two heat exchange tubes; and

[0033] A second conducting member, disposed in the liquid outlet chamber, configured to conduct the two heat exchange tubes.

[0034] In some embodiments, a plurality of the through holes are arranged in a row direction, and the conducting member connects adjacent two of the through holes along the row direction; or,

[0035] A plurality of the through holes are arranged in a column direction, and the conducting member connects adjacent two of the through holes along the column direction; or,

[0036] A plurality of the through holes are arranged in a row direction and also in a column direction, and some of the conducting members connect adjacent two of the through holes along the row direction, and the remaining conducting members connect adjacent two of the through holes along the column direction.

[0037] In some embodiments, the partition member divides the internal space enclosed by the upper cover and the lower cover into the liquid inlet chamber and the liquid outlet chamber along a horizontal direction, and the column direction is parallel to the extending direction of the partition member.

[0038] In a second aspect, an embodiment of the present application provides an indoor air conditioner, which includes:

[0039] A fan coil unit as described in any one of the above;

[0040] A housing, wherein the liquid distributor and the heat exchanger are both arranged inside the housing; and

[0041] A water receiving tray, which is arranged inside the housing and is located below the heat exchanger and the liquid distributor.

[0042] In a third aspect, an embodiment of the present application provides a heating and ventilation system, which includes:

[0043] The indoor air conditioner as described above; and

[0044] An outdoor air conditioner, which is connected to the indoor air conditioner through pipelines.

[0045] Based on the fan coil unit of the embodiment of the present application, the housing has a plurality of pipe passing holes, and the plurality of pipe passing holes are respectively communicated with the liquid inlet chamber and the liquid outlet chamber, and are used for the heat exchange pipes to pass through, so as to realize the rapid installation of the heat exchange pipes and the housing. The plurality of pipe passing holes can be docked with the heat exchange pipes one by one, improving the accuracy of installation positioning, thereby ensuring that each heat exchange pipe can obtain sufficient liquid flow, and ensuring the uniform flow of the liquid in each heat exchange pipe, avoiding problems such as reduced heat exchange efficiency, local overheating or overcooling caused by uneven flow. At the same time, through the docking and cooperation between the pipe passing holes and the heat exchange pipes, the docking of multiple branch pipes with the heat exchange pipes is avoided, the structure of the liquid distributor is simplified, and installation steps such as welding between the heat exchange pipes and the housing are avoided, greatly improving the installation efficiency.

[0046] Moreover, a first step portion is provided on the hole wall of the pipe passing hole, and a second step portion is provided on the heat exchange pipe. The first step portion and the second step portion are in abutting cooperation to limit the axial movement of the heat exchange pipe along the pipe passing hole, making the connection between the heat exchange pipe and the pipe passing hole tighter and more firm, and enhancing the stability of the overall structure of the fan coil unit. In the face of external environmental changes and internal pressure fluctuations, the risk of loosening and detachment between components can be reduced, and the reliability and service life of the equipment can be improved.

[0047] The tight abutting of the first step portion and the second step portion forms a mechanical seal structure, which can effectively prevent fluid from leaking from the gap between the heat exchange pipe and the pipe passing hole. The seal is more reliable and is not easily caused by the aging or damage of the sealing material. During the working process, the components where the heat exchange pipe and the pipe passing hole are located may expand and contract due to temperature changes. The matching design of the first step portion and the second step portion can adapt to this thermal expansion and contraction within a certain range, maintain the stability of the sealing effect, and avoid leakage problems caused by component deformation, thereby greatly improving the sealing performance. Brief Description of the Drawings

[0048] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0049] Figure 1 It is a schematic assembly structure diagram of an embodiment of a fan coil unit of the present application;

[0050] Figure 2 It is a schematic partial assembly structure diagram of the first perspective of the fan coil unit of the present application;

[0051] Figure 3 It is a schematic partial assembly structure diagram of the second perspective of the fan coil unit of the present application;

[0052] Figure 4 It is an exploded structure diagram of an embodiment of a manifold of the present application;

[0053] Figure 5 For Figure 3 It is a schematic cross-sectional structure diagram at A-A of the fan coil unit shown;

[0054] Figure 6 For Figure 5 It is an enlarged view of an embodiment at B shown in;

[0055] Figure 7 For Figure 5 It is an enlarged structural diagram of another embodiment at B shown in;

[0056] Figure 8 For Figure 4 It is a top view structural diagram of the manifold shown in;

[0057] Figure 9 For Figure 8 It is a schematic cross-sectional view at C-C in;

[0058] Figure 10 It is a flow path schematic diagram of the manifold of the present application.

[0059] Explanation of the reference numerals in the drawings:

[0060] 100, Fan coil unit; 10, Manifold; 1, Housing; 10a, Liquid inlet chamber; 10b, Liquid outlet chamber; 11, Upper cover; 11a, Water inlet through-hole; 11b, Water outlet through-hole; 111, Upper top wall; 112, Upper side wall; 12, Lower cover; 12a, Pipe passing hole; 122, First step portion; 122a, First hole section; 122b, Second hole section; 122c, First step surface; 123, Flared hole section; 13, Conducting member; 131, First conducting member; 132, Second conducting member; 133, Conducting inner cavity; 14, Sealing member; 144, Liquid passing hole; 17, Cross-connecting conducting member; 171, Cross-connecting inner cavity; 19, Partition member; 2, Exhaust valve; 3, Water inlet joint; 31, Water inlet interface; 4, Water outlet joint; 41, Water outlet interface;

[0061] 20, Heat exchanger; 21, Heat exchange tube; 211, Perforated section; 2111, Second step portion; 2111a, First pipe section; 2111b, Second pipe section; 2111c, Second step surface; 2112, Flared pipe section; 212, Main body section; 22, Upper side plate; 23, Lower side plate;

[0062] 200, Water receiving tray; 300, Machine housing.

[0063] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0064] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe in detail the embodiments of this application with reference to the accompanying drawings.

[0065] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are only examples of the devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0066] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0068] Heat pump technology is an energy-saving technology that can efficiently utilize low-grade energy. As an environmentally friendly and efficient energy conversion device, it has attracted much attention and has great development potential. It has broad application prospects in the fields of building heating, industrial waste heat utilization, new energy, etc. At present, as the terminal equipment of the HVAC system, the air conditioner indoor unit can be used to adjust the temperature, humidity and cleanliness of the indoor air by cooling or heating the air passing through the heat exchanger by the fan, providing a comfortable environment for the indoor. Among them, the fan coil unit (FCU, Fan Coil Unit) in the air conditioner indoor unit is widely used in hotels, office buildings, hospitals and other places due to its compact structure and various installation methods. As the core component of the fan coil unit, the water distribution and collection device mainly distributes the cold water or hot water transmitted in the HVAC system to the indoor heat exchanger, and then the indoor heat exchanger exchanges heat with the indoor air. Through reasonable design and layout, the water distribution and collection device can balance the pressure of each parallel loop and ensure uniform water flow distribution.

[0069] In the related art, the water distribution and collection device mainly includes two parts: the water distribution device and the water collection device. In the fan coil unit, the water distribution device mainly distributes the water in the main water supply pipe as needed to the indoor heat exchanger and ensures that the flow rate of each branch meets the load requirements; while the water collection device mainly converges the water from each branch of the indoor heat exchanger and re-inputs it into the main return water pipe, which can ensure the stable flow rate of each terminal device and avoid the difference in cooling or heating effects caused by hydraulic imbalance.

[0070] However, the water distribution device and the water collection device in the water distribution and collection device are independent of each other and usually need to be manufactured or purchased separately according to system requirements. The manufacturing process is relatively complex, especially for systems with high customization requirements. For example, precise design and welding are required according to the pipe diameter, the number of pipelines and the system pressure requirements. In addition, the complex pipeline connections of the water distribution device and the water collection device require additional space to be reserved, which affects the overall layout efficiency. During installation, on-site welding or assembly is required, increasing the construction difficulty and time cost. The water distribution device and the water collection device need to be fixed separately during installation, and the water supply and return pipes need to be precisely connected. Since their relative positions are fixed, the pipeline orientation and connection angle need to be adjusted multiple times during installation, which not only increases the installation time but also easily leads to installation errors. In addition, during the installation process, the tightness of each interface needs to be ensured, and the sealing difficulty is relatively large, seriously affecting the installation efficiency. Moreover, it is extremely inconvenient during the installation process with the indoor heat exchanger, and the overall installation efficiency is relatively low.

[0071] To solve the above problems, please refer to Figures 1 to 4 , this application proposes a fan coil unit 100, which is applied to an air conditioner indoor unit. In the embodiment of this application, the fan coil unit 100 includes a heat exchanger 20 and a manifold 10.

[0072] The heat exchanger 20 includes heat exchange tubes 21, and the heat exchange tubes 21 are flexible stainless steel tubes. The flexible stainless steel tubes are corrosion-resistant and temperature-pressure-resistant, can be expanded to 3 times the pipe diameter, do not require additional elbows or welded joints, can simplify the complex pipeline layout, improve the installation efficiency, and have a long service life, reducing the maintenance and replacement costs. Of course, the heat exchange tubes 21 can also be copper tubes, aluminum tubes, etc., and this application does not limit this.

[0073] The manifold 10 includes a housing 1. The housing 1 can be made of materials such as plastic, aluminum, stainless steel, etc., and has high strength and corrosion resistance. The housing 1 has an independent liquid inlet chamber 10a and a liquid outlet chamber 10b. The liquid inlet chamber 10a is used to distribute the liquid to a plurality of heat exchange tubes 21, and the liquid outlet chamber 10b is used to collect the liquid of a plurality of heat exchange tubes 21. It should be noted that the liquid can be refrigerant, coolant, etc. In an embodiment of this application, the liquid is water, and the water can exchange heat with the indoor air after flowing through the heat exchange tubes 21.

[0074] The housing 1 of the technical solution of this application has a plurality of tube holes 12a, and the plurality of tube holes 12a are respectively communicated with the liquid inlet chamber 10a and the liquid outlet chamber 10b, and are used for the heat exchange tubes 21 to pass through them, realizing the rapid installation of the heat exchange tubes 21 and the housing 1. The plurality of tube holes 12a can be docked one by one with the heat exchange tubes 21, improving the accuracy of installation positioning, so as to ensure that each heat exchange tube 21 can obtain sufficient liquid flow, and ensure the uniform liquid flow in each heat exchange tube 21, avoiding problems such as reduced heat exchange efficiency, local overheating or overcooling caused by uneven flow. At the same time, through the docking and cooperation of the tube holes 12a and the heat exchange tubes 21, it avoids the setting of multiple branch pipes on the manifold in the prior art to dock with the heat exchange tubes 21, simplifies the structure of the manifold, and avoids installation steps such as welding between the heat exchange tubes 21 and the housing 1, greatly improving the installation efficiency.

[0075] Please refer to Figures 4 to 7, a first step portion 122 is provided on the pore wall of the pipe hole 12a, and a second step portion 2111 is provided on the heat exchange tube 21. The first step portion 122 is in abutting cooperation with the second step portion 2111 to limit the axial movement of the heat exchange tube 21 along the pipe hole 12a. The abutting cooperation design of the first step portion 122 and the second step portion 2111 makes the connection between the heat exchange tube 21 and the pipe hole 12a tighter and more secure, enhancing the stability of the overall structure of the fan coil unit 100. When facing external environmental changes and internal pressure fluctuations, it can reduce the risk of loosening and detachment between components, improving the reliability and service life of the equipment.

[0076] The tight abutting of the first step portion 122 and the second step portion 2111 forms a mechanical seal structure, which can effectively prevent fluid from leaking through the gap between the heat exchange tube 21 and the pipe hole 12a. Compared with simple sealing methods such as sealant or gasket, this structural seal is more reliable and is not easily caused by the aging or damage of the sealing material to result in seal failure. During the working process, the components where the heat exchange tube 21 and the pipe hole 12a are located may undergo thermal expansion and contraction due to temperature changes. The cooperation design of the first step portion 122 and the second step portion 2111 can adapt to this thermal expansion and contraction within a certain range, maintaining the stability of the sealing effect and avoiding leakage problems caused by component deformation, thereby greatly improving the sealing performance.

[0077] In some embodiments, the housing 1 can be an integral component formed by welding or casting, etc., or can be a split type. In the structural form where the housing 1 is a split type, the housing 1 includes an upper cover 11, a lower cover 12, and a seal 14. The lower cover 12 is connected to the upper cover 11, and a plurality of pipe holes 12a are provided through the lower cover 12; at least part of the seal 14 is located between the upper cover 11 and the lower cover 12 to jointly define an inlet liquid chamber 10a and an outlet liquid chamber 10b with the upper cover 11. As the top closure, the upper cover 11 can be provided with necessary components of the liquid collector 10 such as a water inlet interface 31 and a water outlet interface 41. The above components can be provided on the upper top wall 111 or the upper side wall 112 of the upper cover 11 to facilitate the connection of the water inlet interface 31 and the water outlet interface 41 to the inlet liquid chamber 10a and the outlet liquid chamber 10b respectively.

[0078] Among them, the upper cover 11 and the lower cover 12 can be connected in a detachable form such as screwing or clamping. Of course, they can also be connected into one body by welding, etc. after being separately cast during production. And the materials of the upper cover 11 and the lower cover 12 can be the same or different. For example, the upper cover 11 and the lower cover 12 can be made of the same material such as copper, aluminum, stainless steel, or plastic, or can be made of one of the materials respectively. This application does not limit this.

[0079] The seal 14 is provided with a plurality of liquid passing holes 144, and the liquid passing holes 144 communicate with the pipe passing holes 12a one by one. The liquid passing holes 144 can ensure the directional flow of the liquid and avoid cross-flow, so that after the heat exchange tube 21 is inserted into the pipe passing holes 12a, the liquid in the heat exchange tube 21 can flow into the liquid outlet cavity 10b, or the liquid in the liquid inlet cavity 10a can flow into the heat exchange tube 21 to form a stable circulating heat exchange flow path to meet the flow requirements of the equipment during operation.

[0080] The seal 14 can fill the microscopic gap between the upper cover 11 and the lower cover 12, and can also be used to seal another part of the hole wall where the heat exchange tube 21 passes through the pipe passing hole 12a, further ensuring the sealing effect. The seal 14 can be made of materials such as silica gel and rubber, and has high waterproofness and corrosion resistance. It is integrally formed with one of the upper cover 11 or the lower cover 12 by an injection molding method, or is integrally formed with the upper cover 11 and the upper cover 11 together, without welding or complex positioning, greatly improving the installation efficiency.

[0081] In some embodiments, each heat exchange tube 21 includes a main body section 212 and a perforated section 211. The perforated section 211 is connected and communicated with the main body section 212. The perforated sections 211 are inserted into the pipe passing holes 12a one by one to form a plurality of flow paths, making the installation of the heat exchange tube 21 more convenient and accurate. Quick positioning is achieved through the abutment of the second step portion 2111 and the first step portion 122 to ensure that the heat exchange tube 21 is installed in place, improving the installation efficiency. And the second step portion 2111 is provided on the perforated section 211, avoiding increasing the processing steps of the main body section 212 and also avoiding the influence of the second step portion 2111 on the heat exchange efficiency of the main body section 212, which can effectively control the processing cost and also ensure the heat exchange efficiency.

[0082] Specifically, the perforated section 211 includes a first pipe section 2111a and a second pipe section 2111b. The first pipe section 2111a is communicated with the main body section 212, and the second pipe section 2111b is communicated with the first pipe section 2111a. By separately processing the perforated section 211, for example, expanding the pipe of the perforated section 211, the diameter of the second pipe section 2111b is made larger than that of the first pipe section 2111a, so that the perforated section 211 is configured to form the second step portion 2111, and a second step surface 2111c is configured between the first pipe section 2111a and the second pipe section 2111b.

[0083] The pipe passing hole 12a includes a first hole section 122a and a second hole section 122b. The first hole section 122a is for the first pipe section 2111a to pass through it, and the second hole section 122b is for the second pipe section 2111b to pass through it. The diameter of the second hole section 122b is larger than that of the first hole section 122a, so that the pipe passing hole 12a constructs a first step portion 122, and a first step surface 122c is constructed between the first hole section 122a and the second hole section 122b. The second step portion 2111 abuts and cooperates with the first step portion 122 of the pipe passing hole 12a to form a mechanical stop. This structure can effectively limit the axial movement of the heat exchange pipe 21 along the pipe passing hole 12a and ensure the stable position of the heat exchange pipe 21 during installation and use. At the same time, the cooperation of the step portions also increases the connection strength between the heat exchange pipe 21 and the pipe passing hole 12a, making the connection between the two more firm and reliable.

[0084] Moreover, the perforated section 211 is divided into a first pipe section 2111a and a second pipe section 2111b, and the second step portion 2111 is formed by expanding the pipe. The expanded second pipe section 2111b has a larger cross-sectional area, can withstand greater pressure and mechanical stress, enhances the stability of the heat exchange pipe 21 in the pipe passing hole 12a, and reduces the risk of displacement or damage of the heat exchange pipe 21 caused by vibration or fluid impact. The segmented design of the perforated section 211 and the pipe passing hole 12a makes the installation of the heat exchange pipe 21 more convenient and accurate. The installer can easily insert the perforated section 211 into the corresponding pipe passing hole 12a, and realize quick positioning through the abutment of the second step portion 2111 and the first step portion 122, ensuring that the heat exchange pipe 21 is installed in place and improving the installation efficiency and quality.

[0085] In a structural form, the first step surface 122c extends horizontally or obliquely upward along the direction close to the central axis of the perforated section 211, and the second step surface 2111c extends horizontally or obliquely downward along the direction away from the central axis of the perforated section 211; or, only the first step surface 122c extends horizontally or obliquely upward along the direction close to the central axis of the perforated section 211, while the second step surface 2111c extends in any direction. The horizontal inclination angles of the first step surface 122c and the second step surface 2111c relative to the central axis direction of the pipe passing hole 12a can be 30°, 60° or 90°, etc.

[0086] With such a setting, the first step surface 122c extends towards the central axis direction of the perforated section 211. When the heat exchange pipe 21 is passed through the pipe passing hole 12a, the first step surface 122c can better fit the outer shape of the heat exchange pipe 21, reduce the gap, and prevent fluid leakage. And the second step surface 2111c extends away from the central axis direction of the perforated section 211, which can further seal the space between the heat exchange pipe 21 and the pipe passing hole 12a and enhance the reliability of the seal.

[0087] The cooperation between the first stepped surface 122c and the second stepped surface 2111c forms a mechanical locking structure, which makes the connection between the heat exchange tube 21 and the tube passing hole 12a more firm, restricts the movement of the heat exchange tube 21 in the axial and radial directions, enhances the stability of the heat exchange tube 21 in the tube passing hole 12a, and reduces the risk of loosening caused by vibration or fluid impact.

[0088] In another structural form, the first stepped surface 122c and the second stepped surface 2111c are arranged parallel to each other. The parallel stepped surfaces can ensure a more uniform pressure distribution in the contact area. When the heat exchange tube 21 is inserted into the tube passing hole 12a, the parallel contact surfaces of the first stepped portion 122 and the second stepped portion 2111 can provide a consistent sealing pressure, making the sealing effect more reliable. During operation, even if there are slight vibrations or pressure fluctuations, the parallel stepped surfaces can maintain good contact, avoiding seal failure, and thus effectively preventing fluid leakage from the gap between the heat exchange tube 21 and the tube passing hole 12a. Moreover, during the production and installation process, since the first stepped surface 122c and the second stepped surface 2111c are arranged parallel to each other, the installer can quickly position and install them, which is convenient for processing and at the same time avoids the seal failure problem caused by processing errors.

[0089] In some embodiments, as Figure 6 and Figure 7 shown, the tube passing hole 12a further includes a flared hole section 123. The flared hole section 123 communicates with one end of the second hole section 122b far from the first hole section 122a and is flared in the direction away from the second hole section 122b. The perforated section 211 includes a flared tube section 2112. The flared tube section 2112 is connected to one end of the second tube section 2111b far from the first tube section 2111a and is flared in the direction away from the second hole section 122b. The flared tube section 2112 is arranged in the flared hole section 123.

[0090] The tight fit between the flared tube section 2112 and the flared hole section 123 forms a mechanical seal structure. The shape and size of the flared part can be precisely controlled, making the sealing contact surface closer, effectively preventing fluid leakage from the gap between the heat exchange tube 21 and the tube passing hole 12a. When temperature changes cause thermal expansion or contraction of the components, the elastic deformation ability of the flared structure can absorb this change to a certain extent, maintaining the stability of the sealing effect and avoiding seal failure caused by component deformation.

[0091] The flared structure can reduce the flow resistance when the fluid enters the liquid inlet chamber 10a or the liquid outlet chamber 10b, and can guide the fluid to enter the liquid inlet chamber 10a or the liquid outlet chamber 10b more smoothly from the heat exchange tube 21. The cooperation between the flared tube section 2112 and the flared hole section 123 forms a locking structure at the orifice of the tube passing hole 12a, thereby further restricting the movement of the heat exchange tube 21 in the axial and radial directions of the tube passing hole 12a and improving the installation stability.

[0092] In some embodiments, the heat exchanger 20 further includes an upper side plate 22 and a lower side plate 23. A plurality of heat exchange tubes 21 can be arranged in a meandering manner between the upper side plate 22 and the lower side plate 23 to increase the heat exchange path within a limited space and ensure sufficient heat exchange.

[0093] The perforated section 211 passes through the upper side plate 22. Each heat exchange tube 21 is provided with a perforated section 211, and the perforated sections 211 are inserted into the tube passing holes 12a one by one. At this time, in the structural form where the housing 1 is formed into an upper cover 11 and a lower cover 12, the lower cover 12 of the housing 1 can serve as the upper side plate 22 of the heat exchanger 20. The lower cover 12 is provided with tube passing holes 12a, and the perforated sections 211 pass through the tube passing holes 12a, thereby realizing the installation and fixation of the heat exchanger 20 and the distributor 10 and the flow path docking. The installation is efficient and reliable, and the cost is also low.

[0094] In some embodiments, the housing 1 further includes a partition member 19 provided inside the housing 1. The partition member 19 can be a flat plate structure, or can be a plate structure in an arc shape, a wave shape or a broken line shape. The partition member 19 is not limited in this application. The partition member 19 can be arranged in the internal cavity of the integral housing 1 to divide the internal cavity of the housing 1 into a liquid inlet chamber 10a and a liquid outlet chamber 10b, or can cooperate with the upper cover 11 and the lower cover 12 to configure the liquid inlet chamber 10a and the liquid outlet chamber 10b. It should be noted that the partition member 19 is preferably on one of the upper cover 11 and the lower cover 12, that is, one of the upper cover 11 and the lower cover 12 is integrally formed with the partition member 19, or can also be a separate component. Both the upper cover 11 and the lower cover 12 are provided with partition grooves for buckling the partition member 19.

[0095] To facilitate the centralized connection of the multiple heat exchange tubes 21 of the heat exchanger 20 to the housing 1, improve the assembly efficiency and assembly convenience of the fan coil unit 100 and the air conditioner indoor unit, and make the overall structure of the fan coil unit 100 more compact and reduce the space occupancy rate, as Figures 2 to 4 shown, a plurality of heat exchange tubes 21 are all connected to the same side wall of the housing 1. In the form where the upper cover 11 and the lower cover 12 are assembled to form the housing 1, a plurality of heat exchange tubes 21 are all inserted into the lower cover 12 of the housing 1. After assembly, the lower bottom surface of the lower cover 12 is close to or abuts against the heat exchanger 20.

[0096] In this embodiment, please refer toFigures 8 to 10 The separator 19 preferably divides the internal space enclosed by the upper cover 11 and the lower cover 12 into a liquid inlet chamber 10a and a liquid outlet chamber 10b in the horizontal direction. At this time, the separator 19 is arranged perpendicular to the lower bottom surface of the lower cover 12, and the divided liquid inlet chamber 10a and liquid outlet chamber 10b are on the same horizontal level. In other embodiments, the separator 19 preferably divides the internal space enclosed by the upper cover 11 and the lower cover 12 into a liquid inlet chamber 10a and a liquid outlet chamber 10b in the vertical direction. It can be understood that the vertical direction is the direction perpendicular to the lower bottom surface of the lower cover 12. At this time, the separator 19 is arranged parallel to the lower bottom surface of the lower cover 12, and the divided liquid inlet chamber 10a and liquid outlet chamber 10b are stacked and distributed in the vertical direction.

[0097] Furthermore, the above-mentioned manifold 10 further includes a water inlet joint 3 and a water outlet joint 4 provided on the housing 1. Among them, the water inlet joint 3 communicates with the liquid inlet chamber 10a, and the water outlet joint 4 communicates with the liquid outlet chamber 10b. Considering preventing the water inlet external pipe connected to the water inlet joint 3 and the water outlet external pipe connected to the water outlet joint 4 from interfering with the installation of the heat exchanger 20, both the water inlet joint 3 and the water outlet joint 4 are installed on the same side wall of the housing 1, and the side wall on which the water inlet joint 3 and the water outlet joint 4 are installed is opposite to the side wall on which the plurality of heat exchange tubes 21 are installed. In the form where the upper cover 11 and the lower cover 12 are assembled to form the housing 1, both the water inlet joint 3 and the water outlet joint 4 are inserted into the upper cover 11 of the housing 1.

[0098] It should be noted that when the separator 19 divides the internal space enclosed by the upper cover 11 and the lower cover 12 into a liquid inlet chamber 10a and a liquid outlet chamber 10b in the horizontal direction, the upper cover 11 is provided with a water inlet through hole 11a that matches the shape and size of the water inlet joint 3. The water inlet joint 3 is inserted into the water inlet through hole 11a, and the water inlet external pipe will directly conduct the liquid inlet chamber 10a through the water inlet interface 31 of the water inlet joint 3, so that the liquid will directly flow through the water inlet interface 31 and fill into the liquid inlet chamber 10a. Similarly, the upper cover 11 is also provided with a water outlet through hole 11b that matches the shape and size of the water outlet joint 4. The water outlet joint 4 is inserted into the water outlet through hole 11b, and the water outlet external pipe will directly conduct the liquid outlet chamber 10b through the water outlet interface 41 of the water outlet joint 4, so that the liquid collected in the liquid outlet chamber 10b will directly flow through the water outlet interface 41 and enter the water outlet external pipe.

[0099] When the separator 19 divides the internal space enclosed by the upper cover 11 and the lower cover 12 into an inlet chamber 10a and an outlet chamber 10b in the vertical direction, the flow distributor 10 further includes a first flow guiding member and a second flow guiding member. A first flow guiding channel is provided through the interior of the first flow guiding member, and a second flow guiding channel is provided through the interior of the second flow guiding member. Among them, the first flow guiding member is disposed in the outlet chamber 10b, and both ends of the first flow guiding member are respectively abutted against the separator 19 and the upper cover 11. The water inlet interface 31 of the water inlet joint 3 conducts the inlet chamber 10a through the first flow guiding channel. In this way, the internal flow channel of the water inlet joint 3 is isolated from the outlet chamber 10b through the first flow guiding member at the position passing through the outlet chamber 10b. Then, the liquid will flow through the water inlet interface 31 and the first flow guiding channel in sequence from the water inlet outer pipe and be filled into the inlet chamber 10a, and it is ensured that the liquid inside the first flow guiding channel will not penetrate with the liquid inside the outlet chamber 10b.

[0100] The second flow guiding member is disposed in the inlet chamber 10a, and both ends of the second flow guiding member are respectively abutted against the separator 19 and the lower cover 12. The heat exchange tube 21 conducts the outlet chamber 10b through the second flow guiding channel. In this way, the liquid flowing out of the heat exchange tube 21 can be separated from the liquid in the inlet chamber 10a, so that the liquid inside the second flow guiding channel will not penetrate with the liquid inside the inlet chamber 10a, and guides the liquid to pass through the inlet chamber 10a and be filled into the outlet chamber 10b, and finally flows into the water outlet outer pipe through the water outlet interface 41.

[0101] It should be supplemented and explained here that the lower chamber on the side close to the heat exchanger 20 of the above-mentioned flow distributor 10 is configured as the inlet chamber 10a, and the upper chamber on the side away from the heat exchanger 20 is configured as the outlet chamber 10b. Therefore, the liquid will flow through the water inlet interface 31 and the first flow guiding channel in sequence from the water inlet outer pipe and be filled into the inlet chamber 10a, while the liquid flowing out of the heat exchange tube 21 passes through the second flow guiding channel through the inlet chamber 10a and is filled into the outlet chamber 10b. The flow distributor 10 of the present application can configure the lower chamber on the side close to the heat exchanger 20 as the outlet chamber 10b according to design requirements or structural design, and the upper chamber on the side away from the heat exchanger 20 is configured as the inlet chamber 10a. At this time, the liquid will first be filled into the inlet chamber 10a from the water inlet outer pipe and flow into the heat exchange tube 21 after passing through the outlet chamber 10b through the first flow guiding channel, while the liquid flowing out of the heat exchange tube 21 is first filled into the outlet chamber 10b and flows into the water outlet interface 41 of the water outlet joint 4 after passing through the inlet chamber 10a through the second flow guiding channel.

[0102] It can be understood that, please combine Figure 4 、 Figures 8 to 10, the manifold 10 is disposed outside the housing 300 and connected to the housing 300. At this time, the housing 1 of the manifold 10 is inserted and fitted with the heat exchange tubes 21 of the heat exchanger 20. When the liquid entering the liquid inlet chamber 10a from the water inlet interface 31 flows into a plurality of heat exchange tubes 21 at the same time, the liquid inlet chamber 10a realizes the purpose of diverting the liquid to a plurality of heat exchange tubes 21. When the liquid flowing out of a plurality of heat exchange tubes 21 enters the liquid outlet chamber 10b, the liquid outlet chamber 10b realizes the purpose of collecting the liquid of a plurality of heat exchange tubes 21.

[0103] Figure 10 A flow path schematic diagram of the manifold 10 is shown, wherein the solid arrows represent the flow paths of the liquid flowing through the conduction member 13, the dashed arrows represent the flow paths of the liquid flowing through the heat exchange tubes 21, and in combination with Figure 9 the indicated liquid flow paths. The manifold 10 further includes a conduction member 13, which includes a first conduction member 131 and a second conduction member 132. The first conduction member 131 is disposed in the liquid inlet chamber 10a and is used to conduct two heat exchange tubes 21 in the liquid inlet chamber 10a, and the second conduction member 132 is disposed in the liquid outlet chamber 10b and is used to conduct two heat exchange tubes 21 in the liquid outlet chamber 10b. On the one hand, the conduction member 13 provides a more direct and smooth flow channel for the liquid, reducing or even avoiding the turbulent flow and eddy current phenomena caused by the complex flow paths of the liquid in the liquid inlet chamber 10a and the liquid outlet chamber 10b. The liquid can flow more orderly between the heat exchange tubes 21, reducing the local resistance during the flow process, thereby improving the fluid transportation efficiency and reducing the energy loss. On the other hand, the conduction member 13 realizes the conduction between two adjacent heat exchange tubes 21, not only enabling the liquid participating in the heat exchange to be more reasonably distributed and flow between different heat exchange tubes 21, avoiding the situation of excessive or too small liquid flow in some heat exchange tubes 21, so that the heat exchange effects of each heat exchange tube 21 are more uniform. At the same time, it also makes the flow rate and flow volume of the liquid in the heat exchange tubes 21 more stable and reasonable, and the contact time and contact area between the liquid and the tube walls of the heat exchange tubes 21 more uniform, which is conducive to the full transfer of heat from the high-temperature side to the low-temperature side. Therefore, under the action of the conduction member 13, it helps to improve the heat exchange efficiency of the entire fan coil unit 100 and reduce the local overheating or overcooling phenomena caused by uneven heat exchange.

[0104] It should be noted that the above-mentioned conducting member 13 and the heat exchange tube 21 jointly form a heat exchange flow path, and the liquid will flow along the extension direction of the heat exchange flow path and exchange heat with the air flowing through the heat exchanger 20. Among them, the first conducting member 131 and the second conducting member 132 cooperate with each other, extremely effectively extending the length of the heat exchange flow path, that is, extending the flow path of the liquid. In this way, it can ensure that the heat exchange process of the liquid is more sufficient, greatly improving the heat exchange effect. In actual design, according to specific design requirements and structural design schemes, the manifold 10 can be configured with only the first conducting member 131 in the liquid inlet cavity 10a, or only the second conducting member 132 in the liquid outlet cavity 10b. In addition, in this embodiment, the numbers of the first conducting member 131 and the second conducting member 132 are not specifically limited, and the numbers of the first conducting member 131 and the second conducting member 132 can be flexibly set according to actual design requirements to better adapt to the performance requirements under different working conditions.

[0105] In addition, in an embodiment of the present application, by providing a flared hole section 123 in the through-hole 12a and a flared tube section 2112 in the perforated section 211, and the heat exchange tube 21 is inserted into the through-hole 12a, the flared tube section 2112 of the perforated section 211 can be closely attached to the peripheral wall of the first conducting member 131 or the second conducting member 132 to achieve reliable sealed connection, effectively avoiding liquid leakage. And when the temperature change causes the components to thermally expand or contract, the flared structure of the flared tube section 2112 has the ability of elastic deformation, which can absorb this change to a certain extent and maintain the stability of the sealing effect, avoiding sealing failure caused by component deformation.

[0106] It should also be noted that the above-mentioned conducting member 13 is disposed on at least one of the upper cover 11, the lower cover 12 and the partition member 19. In this embodiment, the conducting member 13 is integrally formed on the inner surface of the upper cover 11. In the area of the liquid inlet cavity 10a, the first conducting member 131 extends from the upper cover 11 to the lower cover 12. When the upper cover 11 is covered on the lower cover 12, the first conducting member 131 will abut against the lower cover 12 and accurately conduct the ports of the two heat exchange tubes 21. In the area of the liquid outlet cavity 10b, the second conducting member 132 also extends from the upper cover 11 to the lower cover 12. When the upper cover 11 is covered on the lower cover 12, the second conducting member 132 also abuts against the lower cover 12 and conducts the ports of the two heat exchange tubes 21. Considering that the partition member 19 is disposed perpendicular to the bottom surface of the lower cover 12 and its position is above the heat exchange tube 21. Under this structural layout, when the liquid wants to flow into or out of the heat exchange tube 21, the partition member 19 will block the flow of the liquid, such as Figure 10As shown, the conducting member 13 can also be arranged on the separating member 19. In this way, the two heat exchange tubes 21 located below the separating member 19 are made to communicate with each other, ensuring that the liquid can flow smoothly between the two heat exchange tubes 21 and guaranteeing the smoothness of the liquid flow path in the entire heat exchange system. At the same time, the conducting member 13, as a part of the separating member 19, is equivalent to increasing the effective width of the separating member 19. From the perspective of the mechanical structure, a wider separating member 19 has stronger bending and anti-deformation capabilities when resisting external forces. When the separating member 19 faces the impact of liquid pressure, it can better maintain its own shape and position with better mechanical structure characteristics, reducing deformations, displacements, etc. caused by the pressure impact, thereby greatly enhancing the structural stability of the entire manifold 10.

[0107] In other embodiments, the conducting member 13 can also be integrally formed on the inner surface of the lower cover 12. The conducting member 13 extends from the lower cover 12 towards the upper cover 11. When the upper cover 11 is covered on the lower cover 12, the conducting member 13 will abut against the upper cover 11 and accurately conduct the two heat exchange tubes 21. Of course, the conducting member 13 can also be only arranged on the separating member 19. For example, the separating member 19 is horizontally arranged, dividing the internal space enclosed by the upper cover 11 and the lower cover 12 into a liquid inlet chamber 10a and a liquid outlet chamber 10b. A first conducting member 131 is extended and arranged on one side of the separating member 19 facing the liquid inlet chamber 10a, and a second conducting member 132 is extended and arranged on one side of the separating member 19 facing the liquid outlet chamber 10b. When the upper cover 11 is covered on the lower cover 12, the first conducting member 131 abuts and fits against the upper cover 11, and the second conducting member 132 abuts and fits against the lower cover 12, and both the first conducting member 131 and the second conducting member 132 can communicate with the heat exchange tubes 21, enabling the liquid to flow between the two heat exchange tubes 21 through the conducting member 13. In actual design, according to specific design requirements and structural design schemes, some of the conducting members 13 can be arranged on the upper cover 11, and some of the conducting members 13 can be arranged on the lower cover 12.

[0108] Specifically, please refer to Figure 9 As shown, a conducting inner cavity 133 is provided inside the conducting member 13, and along the direction perpendicular to the lower bottom surface of the lower cover 12, the conducting inner cavity 133 covers two adjacent tube passing holes 12a, and the two adjacent tube passing holes 12a communicate with the conducting inner cavity 133. Among them, the arrangement form of the multiple tube passing holes 12a can be: the multiple tube passing holes 12a are arranged along the row direction, and the conducting member 13 communicates with two adjacent tube passing holes 12a along the row direction. Or, the multiple tube passing holes 12a are arranged along the column direction, and the conducting member 13 communicates with two adjacent tube passing holes 12a along the column direction. Or, the multiple tube passing holes 12a are arranged along the row direction and along the column direction, and some of the conducting members 13 communicate with two adjacent tube passing holes 12a along the row direction, and the remaining conducting members 13 communicate with two adjacent tube passing holes 12a along the column direction.

[0109] With such a configuration, in the actual fan coil unit 100, the configuration of the tube holes 12a and the conductive members 13 can flexibly cope with various layout situations. When the heat exchange tubes 21 are arranged in a simple row or column direction, the conductive members 13 can connect adjacent tube holes 12a along the row direction or column direction accordingly to ensure smooth flow of liquid between the heat exchange tubes 21. For heat exchange tubes 21 with a complex mixed arrangement of rows and columns, some conductive members 13 are connected along the row direction and some are connected along the column direction, accurately adapting to this complex layout and meeting the liquid conduction requirements in different design scenarios.

[0110] At the same time, by connecting the adjacent tube holes 12a through the conductive member 13, the liquid entering the liquid inlet chamber 10a can be more evenly distributed to different heat exchange tubes 21, and the liquid flowing out of different heat exchange tubes 21 can also be more smoothly collected in the liquid outlet chamber 10b. For example, when the heat exchange tubes 21 are arranged in the row direction and the conductive member 13 is connected in the row direction, the liquid can be evenly distributed between the heat exchange tubes 21 in the row direction, ensuring that each heat exchange tube 21 can work under the optimal flow condition, improving the overall heat exchange efficiency, and also allowing the liquid to flow more orderly between the heat exchange tubes 21, reducing the local resistance during the flow process, thereby improving the fluid transportation efficiency, reducing energy loss, and improving the operating performance of the entire fan coil unit 100 and the air conditioner indoor unit.

[0111] In addition, whether the connection is in the row direction, column direction, or a mixed row and column direction, the connection stability of the shell 1 is increased. Under the pressure impact generated by the flow of liquid, this stable partition 19 can better withstand external forces, and can also more evenly distribute the pressure generated by the liquid acting on the pipeline and the connection part of the pipeline during the flow process to the entire shell 1, thereby reducing the risk of loosening and falling off of the connection between the shell 1 and the heat exchange tube 21. For example, in the case of a mixed row and column arrangement, the conductive parts 13 in different directions work together to disperse the liquid pressure in the row and column directions, avoiding structural damage caused by excessive local force, and further enhancing the stability and reliability of the entire shell 1.

[0112] It should be added that Figure 10 As shown, when the partition 19 divides the internal space enclosed by the upper cover 11 and the lower cover 12 into the liquid inlet cavity 10a and the liquid outlet cavity 10b along the horizontal direction, the direction extending along the long side of the lower cover 12 can be defined as the row direction, and the direction extending along the short side of the lower cover 12 can be defined as the longitudinal direction. When the partition 19 divides the internal space enclosed by the upper cover 11 and the lower cover 12 into the liquid inlet cavity 10a and the liquid outlet cavity 10b along the horizontal direction, the row direction is perpendicular to the extension direction of the partition 19 or obliquely intersects with the partition 19, and the column direction is parallel to the extension direction of the partition 19.

[0113] Understandably, in the case where the partition member 19 divides the internal space enclosed by the upper cover 11 and the lower cover 12 into an inlet chamber 10a and an outlet chamber 10b in the horizontal direction, the conduction member 13 conducts adjacent two heat exchange tubes 21 along the row direction and / or the column direction, and uses the heat exchange tubes 21 below the partition member 19 to guide the liquid on the side of the inlet chamber 10a to the side of the outlet chamber 10b, so as to achieve the purpose that the heat exchange flow path formed by the conduction member 13 and the heat exchange tubes 21 together connects the inlet chamber 10a and the outlet chamber 10b.

[0114] In addition to the above-mentioned manner, as a preferred manner of this embodiment, please refer to Figure 10 As shown, the manifold 10 further includes a cross-connecting conduction member 17. The cross-connecting conduction member 17 penetrates through the partition member 19. Specifically, the cross-connecting conduction member 17 is arranged on the partition member 19 and integrally formed with the partition member 19. And an internal cross-connecting cavity 171 is provided inside the cross-connecting conduction member 17, and the internal cross-connecting cavity 171 covers two pipe-passing holes 12a on both sides of the partition member 19, so that a part of the cross-connecting conduction member 17 is located in the inlet chamber 10a and conducts with one heat exchange tube 21, and the remaining part is located in the outlet chamber 10b and conducts with another heat exchange tube 21.

[0115] The manner in which the conduction member 13 cooperates with the heat exchange tubes 21 to guide the liquid to flow from the inlet chamber 10a to the outlet chamber 10b is relatively indirect. The cross-connecting conduction member 17 can directly connect the inlet chamber 10a and the outlet chamber 10b, and establish an efficient liquid flow shortcut between the heat exchange tubes 21 on both sides of the partition member 19, greatly simplifying the liquid flow path between the inlet and outlet chambers 10b, shortening the heat exchange cycle, enabling more liquid to participate in the heat exchange process per unit time, improving the heat exchange efficiency of the entire fan coil unit 100, and thus being conducive to efficiently adjusting the indoor temperature.

[0116] A plurality of cross-connecting conduction members 17 are configured, and a plurality of conduction members 13 are also configured in both the inlet chamber 10a and the outlet chamber 10b. The plurality of conduction members 13, the plurality of heat exchange tubes 21 and the plurality of cross-connecting conduction members 17 constitute a plurality of heat exchange flow paths. One end of each heat exchange flow path conducts with the inlet chamber 10a, and the other end conducts with the outlet chamber 10b. This enables the liquid participating in the heat exchange to flow in more paths, fully contact with air or other heat exchange media, greatly increasing the heat exchange area and paths, thus significantly improving the heat exchange efficiency of the entire heat exchanger 20 and being able to more quickly and effectively adjust the temperature. At the same time, the plurality of independent heat exchange flow paths can make the liquid evenly distributed and flow between the inlet chamber 10a and the outlet chamber 10b. Each heat exchange flow path can relatively independently complete the heat exchange process, avoiding the situation where the liquid is concentrated in a few heat exchange flow paths, resulting in excessive heat exchange in some areas and insufficient heat exchange in other areas. This helps to make the heat exchange of the entire heat exchanger 20 more uniform and improve the accuracy and stability of temperature control.

[0117] In addition, during the liquid flow process, multiple heat exchange channels can disperse the pressure of the liquid. If there are only a few heat exchange channels, the liquid pressure may concentrate on this heat exchange channel, causing a large pressure on the heat exchange tube 21 and increasing the risk of leakage and damage. Multiple heat exchange channels can share the liquid pressure, reduce the pressure borne by each heat exchange channel, thereby reducing the probability of failures caused by excessive pressure, and improving the stability and reliability of the fan coil unit 100 and the air conditioner indoor unit.

[0118] In some embodiments, please refer to again Figures 8 to 10 , the liquid distributor 10 further includes an exhaust valve 2. The exhaust valve 2 is provided at the top of the housing 1, that is, the exhaust valve 2 is provided on the upper cover 11 of the housing 1, and an exhaust passage is provided inside the exhaust valve 2. An exhaust port 11c is provided on the upper cover 11 of the housing 1. The central axis of the exhaust passage coincides with the exhaust port 11c. The exhaust port 11c can conduct the exhaust passage, so that the exhaust passage of the exhaust valve 2 can discharge the gas in the housing 1. The exhaust valve 2 can be selectively connected to the liquid inlet chamber 10a or the liquid outlet chamber 10b. In actual application scenarios, multiple exhaust valves 2 can be configured according to specific requirements. Some exhaust valves 2 are connected to the liquid inlet chamber 10a, and the other part is connected to the liquid outlet chamber 10b. One part of the exhaust valves 2 is connected to the liquid inlet chamber 10a, and the other part is connected to the liquid outlet chamber 10b. It should be noted that the exhaust valve 2 belongs to the well-known and mature prior art in the field, so its specific structure will not be described in detail here.

[0119] This application also proposes an air conditioner indoor unit, which includes a fan coil unit 100, a housing 300, and a water receiving tray 200. The specific structure of this air conditioner indoor unit refers to the above embodiments. Since this air conditioner indoor unit adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. Among them, the liquid distributor 10 and the heat exchanger 20 are both provided inside the housing 300,

[0120] The water receiving tray 200 is provided inside the housing 300. The water receiving tray 200 usually adopts corrosion-resistant materials (such as stainless steel, ABS plastic, etc.), taking into account both light weight and durability. Anti-slip patterns or diversion grooves can be added to the surface of the water receiving tray 200 to optimize the water collection efficiency. Condensate is likely to be generated on the surface of the heat exchanger 20 due to temperature differences, and there is a small amount of leakage or frosting during the distribution and collection of liquid by the liquid distributor 10. The water receiving tray 200 is located below the heat exchanger 20 and the liquid distributor 10. By using the gravity effect, it collects the condensate or leaked liquid dripping from the heat exchanger 20 and the liquid distributor 10, ensuring that the liquid is directly intercepted and collected by the water receiving tray 200 after natural falling, thereby preventing the liquid from dripping onto other electrical components inside the air conditioner indoor unit, preventing short circuits, corrosion or insulation failure, and significantly improving the reliability of the equipment.

[0121] The present application also provides a heating, ventilation and air conditioning (HVAC) system, which includes the air conditioner indoor unit and the air conditioner outdoor unit as described above, and the air conditioner outdoor unit is connected to the air conditioner indoor unit through pipelines. The HVAC system of the present application includes, but is not limited to, heat pumps, multi-connected units, etc.

[0122] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0123] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fan coil unit, characterized in that, Applied to an air conditioner indoor unit, the fan coil unit includes: A heat exchanger including heat exchange tubes, and the heat exchange tubes are flexible stainless steel tubes; and A liquid distributor including a housing having an independent liquid inlet chamber and a liquid outlet chamber. The liquid inlet chamber is used to distribute liquid to a plurality of the heat exchange tubes, and the liquid outlet chamber is used to collect the liquid from a plurality of the heat exchange tubes. The housing has a plurality of tube passing holes respectively communicating with the liquid inlet chamber and the liquid outlet chamber and for the heat exchange tubes to pass through; Wherein, a first stepped portion is provided on the hole wall of the tube passing hole, and a second stepped portion is provided on the heat exchange tube. The first stepped portion is in abutting cooperation with the second stepped portion to limit the axial movement of the heat exchange tube along the tube passing hole.

2. The fan coil unit according to claim 1, characterized in that, Each of the heat exchange tubes includes: A main body section; and A perforated section connected and communicating with the main body section. The perforated sections are respectively inserted into the tube passing holes one by one, and the second stepped portion is provided on the perforated section.

3. The fan coil unit according to claim 2, wherein, The perforated section includes: A first pipe section communicating with the main body section; and A second pipe section communicating with the first pipe section. The diameter of the second pipe section is larger than that of the first pipe section so that the second stepped portion is configured on the perforated section, and a second stepped surface is configured between the first pipe section and the second pipe section.

4. The fan coil unit according to claim 3, wherein, The tube passing hole includes: A first hole section for the first pipe section to pass through; and A second hole section for the second pipe section to pass through. The diameter of the second hole section is larger than that of the first hole section so that the first stepped portion is configured on the tube passing hole, and a first stepped surface is configured between the first hole section and the second hole section.

5. The fan coil unit according to claim 4, characterized in that, The first stepped surface extends horizontally or obliquely upward in a direction close to the central axis of the perforated section; and / or, The second stepped surface extends horizontally or obliquely downward in a direction away from the central axis of the perforated section.

6. The fan coil unit according to claim 5, characterized in that, The first stepped surface and the second stepped surface are arranged parallel to each other.

7. The fan coil unit according to claim 4, wherein, The tube passing hole further includes: A flared hole section communicating with one end of the second hole section far from the first hole section and flaring in a direction away from the second hole section; The perforated section includes: A flared pipe section connected to one end of the second pipe section far from the first pipe section and flaring in a direction away from the second hole section. The flared pipe section is arranged in the flared hole section.

8. The fan coil unit according to any one of claims 1 to 7, characterized in that, The housing includes: An upper cover; A lower cover connected to the upper cover, and a plurality of the tube passing holes penetrate through the lower cover; and A seal at least partially located between the upper cover and the lower cover to jointly configure the liquid inlet chamber and the liquid outlet chamber with the upper cover. The seal is provided with a plurality of liquid passing holes which are in one-to-one correspondence and communication with the tube passing holes.

9. The fan coil unit according to claim 8, wherein, It further includes: A conducting member arranged in the liquid inlet chamber and used to conduct two of the heat exchange tubes in the liquid inlet chamber, and / or arranged in the liquid outlet chamber and used to conduct two of the heat exchange tubes in the liquid outlet chamber; And A separating member arranged on the upper cover or the lower cover and cooperating with the upper cover and the lower cover to configure the liquid inlet chamber and the liquid outlet chamber; Wherein, the conducting member is disposed on at least one of the upper cover, the lower cover and the partition member.

10. The fan coil unit according to claim 9, characterized in that, The partition member divides the internal space enclosed by the upper cover and the lower cover into the liquid inlet chamber and the liquid outlet chamber along the horizontal direction or the vertical direction.

11. The manifold as claimed in claim 9, wherein, The conducting member includes: a first conducting member disposed in the liquid inlet chamber for connecting the two heat exchange tubes; and a second conducting member disposed in the liquid outlet chamber for connecting the two heat exchange tubes.

12. The fan coil unit according to claim 9, characterized in that, A plurality of the tube passing holes are arranged in the row direction, and the conducting member connects two adjacent ones of the tube passing holes along the row direction; or a plurality of the tube passing holes are arranged in the column direction, and the conducting member connects two adjacent ones of the tube passing holes along the column direction; or a plurality of the tube passing holes are arranged in the row direction and in the column direction, some of the conducting members connect two adjacent ones of the tube passing holes along the row direction, and the remaining conducting members connect two adjacent ones of the tube passing holes along the column direction.

13. The fan coil unit according to claim 12, characterized in that, The partition member divides the internal space enclosed by the upper cover and the lower cover into the liquid inlet chamber and the liquid outlet chamber along the horizontal direction, and the column direction is parallel to the extending direction of the partition member.

14. An air conditioner indoor unit, characterized in that, Comprising: a fan coil unit according to any one of claims 1 to 13; a housing, wherein the manifold and the heat exchanger are both disposed in the housing; and a water receiving tray disposed in the housing and located below the heat exchanger and the manifold.

15. A heating, ventilation and air conditioning (HVAC) system, characterized in that, Comprising: an indoor air conditioner according to claim 14; and an outdoor air conditioner, which is connected to the indoor air conditioner through pipelines.

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