A four-pipe fan coil system, fan coil unit and air conditioner

Abstract

This utility model discloses a four-pipe fan coil system, a fan coil unit, and an air conditioner. The cooling system inlet pipe assembly and the heating system inlet pipe assembly of the four-pipe fan coil system are both connected to the main inlet pipe. A first one-way valve is connected to both the cooling and heating main inlet pipes, allowing fluid to flow only from the heating main inlet pipe to the cooling main inlet pipe. The cooling system inlet pipe assembly is externally connected to a cooling inlet pipe, and a shut-off valve is installed on the cooling inlet pipe. The opening and closing of the shut-off valve allows cold water to flow out first during heating. The heating system outlet pipe assembly and the cooling system outlet pipe assembly are both connected to the main outlet pipe. A second one-way valve is connected to both the cooling and heating outlet pipes, allowing fluid to flow only from the cooling outlet pipe to the heating outlet pipe. This utility model uses a single circulation system for both cooling and heating, and the inlet and outlet systems are connected via main pipes and branch pipes, simplifying the structure.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to a four-pipe fan coil system, a fan coil unit, and an air conditioner. Background Technology

[0002] In existing four-pipe fan coil units, cooling and heating are separate systems, such as Figure 1 , Figure 2 and Figure 3 As shown, the four-pipe fan coil unit has two circulation systems, a cooling system and a heating system, which require separate cooling water inlet assembly 25, heating water inlet assembly 26, cooling water outlet assembly 27 and heating water outlet assembly 28. When cooling, the cooling system circulates liquid to lower the temperature, while the heating system does not operate. When heating, the heating system circulates liquid to raise the temperature, while the cooling system does not operate. The structure is complex and has low integration, and the two circulation systems occupy a large space.

[0003] Due to structural limitations, the system can only be assembled by splitting off a portion of the existing heat exchanger system, resulting in a significant reduction in both cooling and heating efficiency. The simultaneous existence of two independent circulation systems leads to complex inlet and outlet water pipe components, making production and assembly difficult, and resulting in high failure rates and maintenance costs. Furthermore, since heating efficiency is usually lower than cooling efficiency, but the heating system can only improve heating efficiency by significantly increasing the inlet water temperature during heating, the outdoor unit load increases, energy consumption increases, and prolonged high-power heating can easily lead to equipment damage and reduced durability. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a four-pipe fan coil system, a fan coil unit, and an air conditioner. By optimizing the inlet and outlet water pipe structure and circulation system, this invention solves the problems of complex pipe processing and assembly in current four-pipe units, improving the reliability of production and assembly. Simultaneously, the integration of check valves and shut-off valves into the system significantly enhances its heating capacity.

[0005] The present invention adopts the following technical solution.

[0006] This utility model discloses a four-pipe fan coil system, including: a water inlet system and a water outlet system. The water inlet system includes: a cooling system water inlet pipe assembly, a heating system water inlet pipe assembly, and a main water inlet pipe. The cooling system water inlet pipe assembly and the heating system water inlet pipe assembly are both connected to the main water inlet pipe. The main water inlet pipe includes: a cooling water inlet pipe and a heating water inlet pipe. The two ends of a first one-way valve are respectively connected to the cooling water inlet pipe and the heating water inlet pipe. The first one-way valve only allows fluid to flow from the heating water inlet pipe to the cooling water inlet pipe. The cooling system water inlet pipe assembly is externally connected to the cooling water inlet pipe, and a shut-off valve is provided on the cooling water inlet pipe.

[0007] The water outlet system includes: a heating system water outlet pipe assembly, a cooling system water outlet pipe assembly, and a main water outlet pipe. Both the heating system water outlet pipe assembly and the cooling system water outlet pipe assembly are connected to the main water outlet pipe. The main water outlet pipe includes: a cooling water outlet pipe and a heating water outlet pipe. The two ends of the second one-way valve are respectively connected to the cooling water outlet pipe and the heating water outlet pipe. The second one-way valve only allows fluid to flow from the cooling water outlet pipe to the heating water outlet pipe.

[0008] The first and second check valves have built-in automatic pressure controllers.

[0009] Preferably, the cooling water inlet main pipe and the heating water inlet main pipe are open at one end and closed at the other end. The cooling system water inlet pipe assembly is connected to the cooling water inlet main pipe, and the heating system water inlet pipe assembly is connected to the heating water inlet main pipe. A compression ring is provided on the open side of the cooling water inlet main pipe and the heating water inlet main pipe, and the first one-way valve is connected between the cooling water inlet main pipe and the heating water inlet main pipe through the compression ring.

[0010] Preferably, the cooling water outlet main pipe and the heating water outlet main pipe are open at one end and closed at the other end. The cooling system water outlet pipe assembly is connected to the cooling water outlet main pipe, and the heating system water outlet pipe assembly is connected to the heating water outlet main pipe. A compression ring is provided on the open side of the cooling water outlet main pipe and the heating water outlet main pipe, and the second one-way valve is connected between the cooling water outlet main pipe and the heating water outlet main pipe through the compression ring.

[0011] Preferably, the water inlet system further includes: water inlet branch pipes, water inlet main pipes, and multiple water inlet branch pipes connected together. The water inlet branch pipes include: cooling water inlet branch pipes and heating water inlet branch pipes. Multiple cooling water inlet branch pipes are connected to the cooling water inlet main pipe, and multiple heating water inlet branch pipes are connected to the heating water inlet main pipe.

[0012] Preferably, the water outlet system further includes: water outlet branch pipes, a water outlet main pipe, and multiple water outlet branch pipes connected together. The water outlet branch pipes include: a cooling water outlet branch pipe and a heating water outlet branch pipe. Multiple cooling water outlet branch pipes are connected to the cooling water outlet main pipe, and multiple heating water outlet branch pipes are connected to the heating water outlet main pipe.

[0013] Preferably, during cooling, all one-way valves automatically close, and cold water flows only into the cooling inlet branch pipe and out from the cooling system outlet pipe assembly; during heating, all one-way valves automatically operate, and hot water flows into all inlet branch pipes, while the hot water in the cooling outlet main pipe flows out from the heating system outlet pipe assembly through the second one-way valve.

[0014] Preferably, both the inlet branch pipe and the outlet branch pipe are connected to the surface cooler assembly. Multiple circulating water inlet pipes are arranged inside the surface cooler assembly from top to bottom. The inlet of all circulating water inlet pipes is located on the end face of the surface cooler assembly and is connected to the inlet branch pipe. The circulating water inlet pipes wrap around inside the surface cooler assembly and are connected to the return water pipe at one end. The other end of the return water pipe is connected to the circulating water outlet pipe. The outlet of the circulating water outlet pipe is arranged sequentially to the right of the inlet of the circulating water inlet pipe. The circulating water outlet pipe wraps around inside the surface cooler assembly and is connected to the outlet branch pipe at the corresponding outlet to form a circulation loop.

[0015] Preferably, the heating system outlet pipe assembly is externally connected to a heating outlet pipe, and a heating system water valve is installed on the heating outlet pipe; the cooling system outlet pipe assembly is externally connected to a cooling outlet pipe, and a cooling system water valve is installed on the cooling outlet pipe; and the heating system inlet pipe assembly is externally connected to a heating inlet pipe.

[0016] This utility model also discloses a fan coil unit, including the aforementioned four-pipe fan coil unit system.

[0017] This utility model also discloses an air conditioner, including the aforementioned fan coil unit.

[0018] The present invention uses a single circulation system for both cooling and heating, which simplifies the structure, reduces the floor space required, and facilitates subsequent maintenance. At the same time, the water inlet and outlet systems are connected by main pipes and branch pipes, which further simplifies the structure of the water inlet and outlet pipelines, reduces the difficulty of production and assembly and the failure rate, and facilitates subsequent maintenance.

[0019] This utility model is equipped with one-way valves on both the main outlet and inlet water pipes. The automatic pressure controller inside the one-way valve ensures that the one-way valve only operates in heating mode. This allows cold water to be discharged first during heating through the shut-off valve, avoiding any impact on heating efficiency. At the same time, the one-way valve allows hot water to flow in all inlet branch pipes during heating, enabling the heating system to share the same circulation system as the cooling system. This eliminates the need to separate the heating and cooling systems, significantly improving both heating and cooling efficiency. Furthermore, the flow of hot water in all branch pipes maximizes the heat exchange area, greatly increasing heating capacity without raising the water temperature. This reduces equipment energy consumption and load, and improves equipment durability. Attached Figure Description

[0020] Figure 1 This is the first structural diagram of a four-pipe fan coil unit in the existing technology;

[0021] Figure 2 This is the second structural diagram of a four-pipe fan coil unit in the existing technology;

[0022] Figure 3 This is the third structural diagram of a four-pipe fan coil unit in the existing technology;

[0023] Figure 4 This is a structural diagram of the present invention;

[0024] Figure 5 This is a structural diagram of the water inlet system and water outlet system of this utility model;

[0025] Figure 6 This is a structural diagram of the water inlet system of this utility model;

[0026] Figure 7 This is a structural diagram of the water outlet system of this utility model;

[0027] Figure 8 This is a cross-sectional view of the water outlet system of this utility model;

[0028] Figure 9 This is an assembly drawing of this utility model;

[0029] Figure 10 This is a flowchart of the present invention;

[0030] In the diagram: 1. Side panel; 3. Baffle; 4. Heating system outlet pipe assembly; 5. Cooling system outlet pipe assembly; 6. Cooling system inlet pipe assembly; 7. Heating system inlet pipe assembly; 8. Cooler assembly; 9. Main inlet pipe; 9.1 Cooling main inlet pipe; 9.2 Heating main inlet pipe; 10. Main outlet pipe; 10.1 Cooling main outlet pipe; 10.2 Heating main outlet pipe; 11. Branch inlet pipe; 11.1 Cooling branch inlet pipe; 11.2 Heating branch inlet pipe; 12. Branch outlet pipe Pipes; 12.1, Cooling water outlet branch pipe; 12.2, Heating water outlet branch pipe; 13, Compression ring clamp; 14, First check valve; 15, Cooling water inlet pipe; 16, Heating water inlet pipe; 17, Cooling water outlet pipe; 18, Heating water outlet pipe; 20, Shut-off valve; 21, Heating system water valve; 22, Opening; 23, Cooling system water valve; 24, Return water pipe; 25, Cooling water inlet assembly; 26, Heating water inlet assembly; 27, Cooling water outlet assembly; 28, Heating water outlet assembly; 29, Second check valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The embodiments described in this application are merely some embodiments of this utility model, and not all embodiments. Based on the spirit of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] like Figures 4-10 As shown, this utility model provides a four-pipe fan coil system. Figure 4This is a schematic diagram of the structure of the four-pipe fan coil system of this utility model. The four-pipe fan coil system includes: a side plate 1, a water inlet system and a water outlet system. An opening 22 is provided on the side plate 1. One end of the water inlet system and the water outlet system are connected to the circulation system in the surface cooler assembly 8, and the other end extends out of the side plate 1 through the opening 22.

[0033] like Figure 4 and Figure 5 As shown, the water inlet system includes: a refrigeration system water inlet pipe assembly 6, a heating system water inlet pipe assembly 7, a main water inlet pipe 9, and a branch water inlet pipe 11. One end of the refrigeration system water inlet pipe assembly 6 and the heating system water inlet pipe assembly 7 are connected to the main water inlet pipe 9. One side of the main water inlet pipe 9 is connected to multiple branch water inlet pipes 11. One end of the branch water inlet pipe 11 is connected to the water inlet of the internal circulation system of the surface cooler assembly 8.

[0034] The water outlet system includes: a heating system water outlet pipe assembly 4, a cooling system water outlet pipe assembly 5, a main water outlet pipe 10, and branch water outlet pipes 12. One end of the heating system water outlet pipe assembly 4 and the cooling system water outlet pipe assembly 5 are connected to the main water outlet pipe 10. One side of the main water outlet pipe 10 is connected to multiple branch water outlet pipes 12. One end of the branch water outlet pipes 12 is connected to the water outlet of the internal circulation system of the surface cooler assembly 8.

[0035] like Figure 4 As shown, the surface cooler assembly 8 is arranged in a disc shape. Multiple circulating water inlet pipes are arranged inside the surface cooler assembly 8 from top to bottom. The inlets of all circulating water inlet pipes are vertically arranged on one side of the end face of the surface cooler assembly 8 and connected to the inlet branch pipe 11. The circulating water inlet pipes are arranged inside the surface cooler assembly 8 and connected to the return water pipe 24 at the end. The other end of the return water pipe 24 is connected to the circulating water outlet pipe. The outlets of the circulating water outlet pipes are arranged from top to bottom to the right of the inlet of the circulating water inlet pipes. The other end of the circulating water outlet pipes is arranged inside the surface cooler assembly 8 and connected to the outlet branch pipe 12 at the corresponding outlet at the end, forming a circulation loop. A baffle 3 is arranged between the two ends of the surface cooler assembly 8.

[0036] like Figure 6 , Figure 7 and Figure 8As shown, the main water inlet pipe 9 includes: a cooling water inlet pipe 9.1 and a heating water inlet pipe 9.2. Both the cooling water inlet pipe 9.1 and the heating water inlet pipe 9.2 are open at one end and closed at the other. The cooling system water inlet pipe assembly 6 is connected to the side wall of the cooling water inlet pipe 9.1, and the heating system water inlet pipe assembly 7 is connected to the side wall of the heating water inlet pipe 9.2. A compression ring 13 is provided on the open side of both the cooling water inlet pipe 9.1 and the heating water inlet pipe 9.2, and the compression ring 13 is used to... The first one-way valve 14 is welded between the cooling water inlet main pipe 9.1 and the heating water inlet main pipe 9.2, so that the cooling water inlet main pipe 9.1 and the heating water inlet main pipe 9.2 are connected and communicate with each other through the first one-way valve 14; wherein the water inlet branch pipe 11 includes: cooling water inlet branch pipe 11.1 and heating water inlet branch pipe 11.2, multiple cooling water inlet branch pipes 11.1 are connected to the side wall of the cooling water inlet main pipe 9.1, and multiple heating water inlet branch pipes 11.2 are connected to the side wall of the heating water inlet main pipe 9.2.

[0037] The main water outlet pipe 10 includes a cooling water outlet pipe 10.1 and a heating water outlet pipe 10.2, both of which are open at one end and closed at the other. A cooling system water outlet pipe assembly 5 is connected to the side wall of the cooling water outlet pipe 10.1, and a heating system water outlet pipe assembly 4 is connected to the side wall of the heating water outlet pipe 10.2. A compression ring 13 is provided on the open side of both the cooling water outlet pipe 10.1 and the heating water outlet pipe 10.2, and the compression ring 13 is used to secure the cooling system water outlet pipe 10.1 to the side wall of the heating system water outlet pipe 10.2. Two one-way valves 29 are welded between the cooling water outlet main pipe 10.1 and the heating water outlet main pipe 10.2, so that the cooling water outlet main pipe 10.1 and the heating water outlet main pipe 10.2 are connected and communicate with each other through the second one-way valve 29; wherein the water outlet branch pipe 12 includes: cooling water outlet branch pipe 12.1 and heating water outlet branch pipe 12.2, multiple cooling water outlet branch pipes 12.1 are connected to the side wall of the cooling water outlet main pipe 10.1, and multiple heating water outlet branch pipes 12.2 are connected to the side wall of the heating water outlet main pipe 10.2.

[0038] The first check valve 14 on the inlet water main 9 only allows fluid to flow from the heating inlet water main 9.2 to the cooling inlet water main 9.1, and the second check valve 29 on the outlet water main 10 only allows fluid to flow from the cooling outlet water main 10.1 to the heating outlet water main 10.2. All check valves are equipped with automatic pressure controllers, which operate the check valves only during heating by controlling the different pressure differences during cooling and heating.

[0039] In a specific embodiment, during cooling, all one-way valves automatically close under the influence of the cooling pressure difference. Cold water flowing into the cooling inlet main pipe 9.1, restricted by the first one-way valve 14, flows through the cooling inlet branch pipe 11.1 into the circulation system within the surface cooler assembly 8 for heat dissipation and cooling. The circulated cold water flows out from the cooling outlet branch pipe 12.1 to the cooling outlet main pipe 10.1, and under the restriction of the second one-way valve 29, the cold water flows out from the cooling system outlet pipe assembly 5. During heating, all one-way valves automatically close under the influence of the cooling pressure difference. Under the influence of thermal pressure difference, it operates on its own. Hot water enters the heating inlet main pipe 9.2 and flows along the direction of the first one-way valve 14 to fill the entire inlet main pipe 9. Then, it flows from the cooling inlet branch pipe 11.1 and the heating inlet main pipe 11.2 into the circulation system in the surface cooler assembly 8 for heating, thereby increasing the heat exchange area. After circulation, the hot water flows from all the outlet branch pipes 12 to the outlet main pipe 10. The hot water in the cooling outlet main pipe 10.1 will flow out from the heating system outlet pipe assembly 4 along the second one-way valve 29.

[0040] The number and position of the heating water inlet branch pipe 11.2 and the heating water outlet branch pipe 12.2 are corresponding, and the number and position of the cooling water inlet branch pipe 11.1 and the cooling water outlet branch pipe 12.1 are corresponding.

[0041] like Figure 9 As shown, the cooling system water inlet pipe assembly 6 is externally connected to a cooling water inlet pipe 15, and a shut-off valve 20 is installed on the cooling water inlet pipe 15. The heating system water inlet pipe assembly 7 is externally connected to a heating water inlet pipe 16. The control board controls the opening and closing of the shut-off valve 20 through electrical signals, so that cold water can flow out first when heating is in operation by controlling the opening and closing of the shut-off valve 20.

[0042] The heating system water outlet pipe assembly 4 is externally connected to the heating water outlet pipe 18, and the heating water outlet pipe 18 is equipped with a heating system water valve 21. The cooling system water outlet pipe assembly 5 is externally connected to the cooling water outlet pipe 17, and the cooling water outlet pipe 17 is equipped with a cooling system water valve 23.

[0043] like Figure 10As shown in the specific embodiment, when the air conditioner is in cooling, fan, or dehumidification mode, the air conditioner is cooling, the shut-off valve 20 is normally open, the heating system water valve 21 is closed, and all one-way valves close automatically due to the pressure difference during cooling. Cold water is introduced into the cooling system water inlet pipe 15 and enters the cooling system water inlet pipe assembly 6. The cold water flows into the cooling water inlet main pipe 9.1 and is restricted by the first one-way valve 14. It then flows through the cooling water inlet branch pipe 11.1 into the circulation system within the surface cooler assembly 8 for heat dissipation and cooling. The circulated cold water flows out from the cooling water outlet branch pipe 12.1 and reaches the cooling water outlet main pipe 10.1. The cold water on the cooling water outlet main pipe 10.1 is restricted by the second one-way valve 29 and flows out from the cooling water outlet pipe 17 through the cooling system water outlet pipe assembly 5. When the air conditioner is not in cooling, fan, or dehumidification mode, the air conditioner is heating. The control main board electrical signal controls the shut-off valve 20 to close first, then delays the opening of the heating system water valve 21 and closes the cooling system water valve. 23. This allows sufficient time for all the previously cooled water to flow out. All one-way valves operate automatically due to the pressure difference during heating. Hot water flows into the heating system inlet pipe assembly 6 through the heating inlet pipe 16 and reaches the heating inlet main pipe 9.2. The hot water flows along the direction of the first one-way valve 14, filling the entire inlet main pipe 9 and flowing into the circulation system within the surface cooler assembly 8 from all inlet branch pipes 11 for heating. This maximizes the heat exchange area, significantly improving heating capacity without increasing water temperature and reducing energy consumption. The circulated hot water flows out from all outlet branch pipes 12 and reaches the outlet main pipe 10. The hot water in the heating outlet main pipe 10.2 flows along the second one-way valve 29 into the heating system outlet pipe assembly 4 and flows out from the heating outlet pipe 18. This utility model achieves the sharing of the cooling circulation system during heating by opening and closing the one-way valve, simplifying the structure and significantly improving heating efficiency. At the same time, the connection between the main pipe and branch pipes further simplifies the inlet and outlet pipe structure and reduces the difficulty of production and assembly.

[0044] Preferably, the water in this invention can be replaced with other media, such as chemical agents.

[0045] This utility model also provides a fan coil unit, including the aforementioned four-pipe fan coil unit system.

[0046] This utility model also provides an air conditioner, including the aforementioned four-pipe fan coil system.

[0047] This utility model also provides a method for controlling an air conditioner, including the following steps:

[0048] Step 1: When the air conditioner is in cooling, ventilation, or dehumidification mode, the air conditioner is cooling, the shut-off valve 20 is normally open, and the heating system water valve 21 is closed.

[0049] Step 2: All one-way valves close automatically due to the pressure difference during refrigeration. Cold water is introduced into the refrigeration system inlet pipe 15 and enters the refrigeration system inlet pipe assembly 6 to reach the main inlet pipe 9. The cold water is restricted in the direction of flow by the first one-way valve 14 in the main inlet pipe 9 and will flow into the surface cooler assembly 8 through the refrigeration inlet branch pipe 11.1 for heat dissipation and cooling.

[0050] Step 3: The circulated chilled water flows out from the chilled water outlet branch pipe 12.1 and reaches the chilled water outlet main pipe 10.1. The chilled water is restricted by the second one-way valve 29 and flows out from the chilled water outlet pipe 17 along the chilled system outlet pipe assembly 5.

[0051] Step 4: When the air conditioner is not in cooling, fan, or dehumidification mode, it will switch to heating mode. The shut-off valve 20 will close first, and after a delay, the heating system water valve 21 will open, while the cooling system water valve 23 will close, allowing cold water to flow out fully.

[0052] Step 5: All one-way valves operate automatically due to the pressure difference during heating. Hot water flows into the heating system inlet pipe assembly 6 through the heating inlet pipe 16 and reaches the main inlet pipe 9. The hot water fills the entire main inlet pipe 9 along the first one-way valve 14 and flows into the surface cooler assembly 8 from all the inlet branch pipes 11 for heating.

[0053] Step 6: The circulated hot water flows out from all the outlet branch pipes 12 to the outlet main pipe 10. The hot water in the heating outlet main pipe 10.2 flows through the second one-way valve 29 to the heating system outlet pipe assembly 4 and flows out from the heating outlet pipe 18.

[0054] This utility model also provides a computer-readable storage medium corresponding to an air conditioner control method, the computer-readable storage medium storing computer instructions, the instructions being executed by a processor, the air conditioner control method.

[0055] The beneficial effects of this utility model are that, compared with the prior art, the refrigeration and heating of this utility model share a single circulation system, which simplifies the structure, reduces the footprint, and facilitates subsequent maintenance. At the same time, the water inlet system and the water outlet system are connected through main pipes and branch pipes, which further simplifies the structure of the water inlet and outlet pipelines, reduces the difficulty of production and assembly and the failure rate, and facilitates subsequent maintenance.

[0056] This utility model is equipped with one-way valves on both the main outlet and inlet water pipes. The automatic pressure controller inside the one-way valve ensures that the one-way valve only operates in heating mode. This allows cold water to be discharged first during heating through the shut-off valve, avoiding any impact on heating efficiency. At the same time, the one-way valve allows hot water to flow in all inlet branch pipes during heating, enabling the heating system to share the same circulation system as the cooling system. This eliminates the need to separate the heating and cooling systems, significantly improving both heating and cooling efficiency. Furthermore, the flow of hot water in all branch pipes maximizes the heat exchange area, greatly increasing heating capacity without raising the water temperature. This reduces equipment energy consumption and load, and improves equipment durability.

[0057] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0059] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0060] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0061] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A four-pipe fan coil system, comprising: Water inlet system and water outlet system; characterized in that: The water inlet system includes: a refrigeration system water inlet pipe assembly (6), a heating system water inlet pipe assembly (7), and a main water inlet pipe (9). Both the refrigeration system water inlet pipe assembly (6) and the heating system water inlet pipe assembly (7) are connected to the main water inlet pipe (9). The main water inlet pipe (9) includes: a refrigeration water inlet pipe (9.1) and a heating water inlet pipe (9.2). The two ends of the first one-way valve (14) are connected to the refrigeration water inlet pipe (9.1) and the heating water inlet pipe (9.2) respectively. The first one-way valve (14) only allows fluid to flow from the heating water inlet pipe (9.2) to the refrigeration water inlet pipe (9.1). The refrigeration system water inlet pipe assembly (6) is externally connected to a refrigeration water inlet pipe (15). A shut-off valve (20) is provided on the refrigeration water inlet pipe (15). The water outlet system includes: a heating system water outlet pipe assembly (4), a cooling system water outlet pipe assembly (5), and a water outlet main pipe (10). The heating system water outlet pipe assembly (4) and the cooling system water outlet pipe assembly (5) are both connected to the water outlet main pipe (10). The water outlet main pipe (10) includes: a cooling water outlet main pipe (10.1) and a heating water outlet main pipe (10.2). The two ends of the second one-way valve (29) are connected to the cooling water outlet main pipe (10.1) and the heating water outlet main pipe (10.2) respectively. The second one-way valve (29) only allows fluid to flow from the cooling water outlet main pipe (10.1) to the heating water outlet main pipe (10.2). The first check valve (14) and the second check valve (29) have built-in automatic pressure controllers.

2. The four-pipe fan coil system according to claim 1, characterized in that: The cooling water inlet pipe (9.1) and the heating water inlet pipe (9.2) are open at one end and closed at the other end. The cooling system water inlet pipe assembly (6) is connected to the cooling water inlet pipe (9.1), and the heating system water inlet pipe assembly (7) is connected to the heating water inlet pipe (9.2). A compression ring clamp (13) is provided on the open side of the cooling water inlet pipe (9.1) and the heating water inlet pipe (9.2). The first one-way valve (14) is connected between the cooling water inlet pipe (9.1) and the heating water inlet pipe (9.2) through the compression ring clamp (13).

3. The four-pipe fan coil system according to claim 1, characterized in that: The cooling water outlet pipe (10.1) and the heating water outlet pipe (10.2) are open at one end and closed at the other end. The cooling system water outlet pipe assembly (5) is connected to the cooling water outlet pipe (10.1), and the heating system water outlet pipe assembly (4) is connected to the heating water outlet pipe (10.2). A compression ring clamp (13) is provided on the open side of the cooling water outlet pipe (10.1) and the heating water outlet pipe (10.2). The second one-way valve (29) is connected between the cooling water outlet pipe (10.1) and the heating water outlet pipe (10.2) through the compression ring clamp (13).

4. The four-pipe fan coil system according to claim 1, characterized in that: The water inlet system further includes: water inlet branch pipe (11), water inlet main pipe (9) and multiple water inlet branch pipes (11) connected together. The water inlet branch pipe (11) includes: a cooling water inlet branch pipe (11.1) and a heating water inlet branch pipe (11.2). Multiple cooling water inlet branch pipes (11.1) are connected to the cooling water inlet main pipe (9.1), and multiple heating water inlet branch pipes (11.2) are connected to the heating water inlet main pipe (9.2).

5. The four-pipe fan coil system according to claim 4, characterized in that: The water outlet system further includes: water outlet branch pipe (12), water outlet main pipe (10) and multiple water outlet branch pipes (12) connected together. The water outlet branch pipe (12) includes: a cooling water outlet branch pipe (12.1) and a heating water outlet branch pipe (12.2). Multiple cooling water outlet branch pipes (12.1) are connected to the cooling water outlet main pipe (10.1), and multiple heating water outlet branch pipes (12.2) are connected to the heating water outlet main pipe (10.2).

6. The four-pipe fan coil system according to claim 5, characterized in that: During cooling, all one-way valves automatically close, and cold water flows into the cooling water inlet branch pipe (11.1) and out from the cooling system outlet pipe assembly (5). During heating, all one-way valves automatically operate, and hot water flows into all inlet branch pipes (11). The hot water in the cooling water outlet main pipe (10.1) flows out from the heating system outlet pipe assembly (4) through the second one-way valve (29).

7. The four-pipe fan coil system according to claim 5, characterized in that: Both the inlet branch pipe (11) and the outlet branch pipe (12) are connected to the surface cooler assembly (8). Multiple circulating water inlet pipes are arranged inside the surface cooler assembly (8) from top to bottom. The inlet of all circulating water inlet pipes is located on the end face of the surface cooler assembly (8) and connected to the inlet branch pipe (11). The circulating water inlet pipes are arranged inside the surface cooler assembly (8) and connected to the return water pipe (24) at the end. The other end of the return water pipe (24) is connected to the circulating water outlet pipe. The outlet of the circulating water outlet pipe is arranged in sequence to the right of the inlet of the circulating water inlet pipe. The circulating water outlet pipe is arranged inside the surface cooler assembly (8) and connected to the outlet branch pipe (12) at the corresponding outlet to form a circulation loop.

8. The four-pipe fan coil system according to claim 1, characterized in that: The heating system outlet pipe assembly (4) is connected to a heating outlet pipe (18), and a heating system water valve (21) is installed on the heating outlet pipe (18). The cooling system outlet pipe assembly (5) is connected to a cooling outlet pipe (17), and a cooling system water valve (23) is installed on the cooling outlet pipe (17). The heating system inlet pipe assembly (7) is connected to a heating inlet pipe (16).

9. A fan coil unit, characterized in that: Includes the four-pipe fan coil system as described in any one of claims 1 to 8.

10. An air conditioner, characterized in that, Includes the fan coil unit as described in claim 9.

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