Four-pipe fan coil system and control method thereof

Abstract

The invention discloses a four-pipe fan coil system and a control method thereof.The refrigerating system water inlet pipe assembly and the heating system water inlet pipe assembly of the four-pipe fan coil system are both connected with a water inlet main pipe, and the two ends of a first one-way valve communicate with a refrigerating water inlet main pipe and a heating water inlet main pipe correspondingly; the first one-way valve only allows fluid to circulate from the heating water inlet main pipe to the refrigeration water inlet main pipe, the refrigeration system water inlet pipe assembly is externally connected with a refrigeration water inlet pipe, a stop valve is arranged on the refrigeration water inlet pipe, and cold water flows out first during heating through opening and closing of the stop valve; the heating system water outlet pipe assembly and the refrigerating system water outlet pipe assembly are both connected with the water outlet main pipe, the two ends of the second one-way valve communicate with the refrigerating water outlet main pipe and the heating water outlet main pipe correspondingly, and the second one-way valve only allows fluid to flow from the refrigerating water outlet main pipe to the heating water outlet main pipe. Refrigerating and heating share one circulating system, the water inlet system and the water outlet system are connected through the main pipe and the branch pipe, and the structure is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a four-pipe fan coil system and a control method thereof. Background Art

[0002] In existing four-pipe fan coil units, refrigeration and heating are separate independent systems. As shown in Figure 1 、 Figure 2 and Figure 3 , the four-pipe fan coil unit has two sets of circulation systems, namely a refrigeration system and a heating system. Therefore, it is necessary to separately set up a separate refrigeration water inlet component 25, a heating water inlet component 26, a refrigeration water outlet component 27, and a heating water outlet component 28. When cooling, the refrigeration system is filled with liquid to cool down, and the heating system does not operate. When heating, the heating system is filled with liquid to heat up, and the refrigeration system does not operate. The structure is complex and the integration degree is low. The two sets of circulation systems occupy a large space;

[0003] Due to structural limitations, its system can only split a part of the existing heat exchanger system to form a heating system, resulting in a significant reduction in the refrigeration and heating efficiency of the device. Due to the simultaneous presence of two independent circulation systems, the structure of the inlet and outlet pipe components is complex, the production and assembly are difficult, and the failure rate and maintenance cost are high; and because the heating efficiency is usually lower than the refrigeration efficiency, but the heating system can only increase the heating efficiency by significantly increasing the inlet water temperature during heating, resulting in an increased load on the outdoor unit, increased energy consumption, and easy damage to the equipment and reduced durability during long-term high-power heating. Summary of the Invention

[0004] To solve the deficiencies in the prior art, the present invention provides a four-pipe fan coil system and a control method thereof. By optimizing the inlet and outlet pipe structure and the circulation system, the present invention solves the problem of complex pipe processing and assembly existing in current four-pipe units, and improves the reliability of production and assembly. At the same time, a check valve and a stop valve are integrated in the system, greatly improving the heating capacity of the system.

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

[0006] In a first aspect, the present invention discloses a four-pipe fan coil system, including: an inlet water system and an outlet water system; the inlet water system includes: a refrigeration system inlet pipe component, a heating system inlet pipe component, and an inlet main pipe. Both the refrigeration system inlet pipe component and the heating system inlet pipe component are connected to the inlet main pipe. The inlet main pipe includes: a refrigeration inlet main pipe and a heating inlet main pipe. Both ends of a first check valve are communicated with the refrigeration inlet main pipe and the heating inlet main pipe respectively. The first check valve only allows fluid to flow from the heating inlet main pipe to the refrigeration inlet main pipe. The refrigeration system inlet pipe component is externally connected to a refrigeration inlet pipe, and a stop valve is arranged on the refrigeration inlet pipe. By opening and closing the stop valve, cold water can flow out first during heating;

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

[0008] The first one-way valve and the second one-way valve are internally provided with a pressure automatic controller, and all the one-way valves only work during heating due to the different pressure differences between heating and refrigeration.

[0009] Preferably, one end of the refrigeration inlet main pipe and the heating inlet main pipe is open and the other end is closed. The refrigeration system inlet pipe assembly is connected to the refrigeration inlet main pipe, and the heating system inlet pipe assembly is connected to the heating inlet main pipe. Compression collars are arranged on the open sides of the refrigeration inlet main pipe and the heating inlet main pipe, and the first one-way valve is connected between the refrigeration inlet main pipe and the heating inlet main pipe through the compression collars.

[0010] Preferably, one end of the refrigeration outlet main pipe and the heating outlet main pipe is open and the other end is closed. The refrigeration system outlet pipe assembly is connected to the refrigeration outlet main pipe, and the heating system outlet pipe assembly is connected to the heating outlet main pipe. Compression collars are arranged on the open sides of the refrigeration outlet main pipe and the heating outlet main pipe, and the second one-way valve is connected between the refrigeration outlet main pipe and the heating outlet main pipe through the compression collars.

[0011] Preferably, the inlet system further includes: inlet branch pipes. The main inlet pipe is connected to a plurality of inlet branch pipes. The inlet branch pipes include: refrigeration inlet branch pipes and heating inlet branch pipes. A plurality of refrigeration inlet branch pipes are connected to the refrigeration inlet main pipe, and a plurality of heating inlet branch pipes are connected to the heating inlet main pipe; The water outlet system further includes: outlet branch pipes. The main water outlet pipe is connected to a plurality of outlet branch pipes. The outlet branch pipes include: refrigeration outlet branch pipes and heating outlet branch pipes. A plurality of refrigeration outlet branch pipes are connected to the refrigeration main water outlet pipe, and a plurality of heating outlet branch pipes are connected to the heating main water outlet pipe.

[0012] Preferably, during refrigeration, all the one-way valves are automatically closed, and cold water only flows into the refrigeration inlet branch pipes and flows out from the refrigeration system outlet pipe assembly; during heating, all the one-way valves automatically operate, hot water will flow into all the inlet branch pipes, and the hot water in the refrigeration main water outlet pipe will flow out from the heating system outlet pipe assembly along the second one-way valve.

[0013] Preferably, both the water inlet branch pipe and the water outlet branch pipe are connected to the surface cooler assembly. Inside the surface cooler assembly, multiple circulating water inlet pipes are arranged from top to bottom. The water inlets of all the circulating water inlet pipes are arranged on the end face of the surface cooler assembly and connected to the water inlet branch pipe. The circulating water inlet pipes surround inside the surface cooler assembly and are connected to the return water pipe at the end. The other end of the return water pipe is connected to the circulating water outlet pipe. The water outlets of the circulating water outlet pipe are sequentially arranged on the right side of the water inlets of the circulating water inlet pipes. The circulating water outlet pipe winds back inside the surface cooler assembly and is connected to the water outlet branch pipe at the corresponding water outlets, forming a circulating loop.

[0014] Preferably, the heating system water outlet pipe assembly is externally connected to the heating outlet pipe, and a heating system water valve is arranged on the heating outlet pipe. The refrigeration system water outlet pipe is externally connected to the refrigeration outlet pipe, and a refrigeration system water valve is arranged on the refrigeration outlet pipe. And the heating system water inlet pipe assembly is externally connected to the heating inlet pipe.

[0015] The second aspect of the present invention discloses an air conditioner, which is characterized by including the four-pipe fan coil system described above.

[0016] The third aspect of the present invention discloses a control method for an air conditioner, based on the four-pipe fan coil system described above, including the following steps:

[0017] When the air conditioner is in the refrigeration, air supply or dehumidification mode, refrigeration will be carried out. The cut-off valve is in the normally open state, and the heating system water valve is closed;

[0018] All one-way valves are automatically closed under the influence of the pressure difference during refrigeration. Cold water is introduced into the refrigeration water inlet main pipe through the refrigeration water inlet pipe. The cold water is restricted by the first one-way valve and will flow into the surface cooler assembly through the refrigeration water inlet branch pipe for refrigeration;

[0019] The circulated cold water flows from the refrigeration water outlet branch pipe to the refrigeration water outlet main pipe, and the cold water is restricted by the second one-way valve and flows out from the refrigeration water outlet pipe;

[0020] When the air conditioner is not in the refrigeration, air supply or dehumidification mode, heating will be carried out. The cut-off valve is first closed, and the heating system water valve is delayed to open and the refrigeration system water valve is closed to allow the cold water to flow out fully;

[0021] All one-way valves are automatically operated under the influence of the pressure difference during heating. Hot water flows into the heating water inlet main pipe through the heating water inlet pipe and fills the entire water inlet main pipe through the first one-way valve, and flows into the surface cooler assembly from all the water inlet branch pipes for heating;

[0022] The circulated hot water flows from all the water outlet branch pipes to the water outlet main pipe, and the hot water in the heating water outlet main pipe will flow out from the heating water outlet pipe along the flow direction of the second one-way valve.

[0023] A fourth aspect of the present invention discloses a computer-readable storage medium storing computer instructions, and the instructions are executed by a processor to implement the air conditioner control method described above.

[0024] The refrigeration and heating of the present invention share a set of circulation systems, which simplifies the structure, reduces the floor space, is conducive to subsequent maintenance. At the same time, both the water inlet system and the water outlet system are connected through the main pipe and the branch pipes, further simplifying the structure of the inlet and outlet water pipelines, reducing the production and assembly difficulty and the failure rate, and being conducive to subsequent maintenance.

[0025] One-way valves are provided on both the water outlet main pipe and the water inlet main pipe of the present invention. The pressure automatic controller in the one-way valve makes the one-way valve work only in the heating mode. Then, through the stop valve, the cold water can be discharged first during heating to avoid affecting the heating efficiency. At the same time, through the one-way valve, the hot water during heating flows in all the water inlet branch pipes, enabling the sharing of the circulation system during refrigeration during heating without splitting the heating and refrigeration systems. The heating and refrigeration efficiencies are both greatly improved. At the same time, the hot water flowing in all the branch pipes maximizes the heat exchange area, greatly improving the heating capacity without increasing the water temperature, reducing the equipment energy consumption and load, and improving the equipment durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the first structure diagram of a four-pipe fan coil unit in the prior art;

[0027] Figure 2 is the second structure diagram of a four-pipe fan coil unit in the prior art;

[0028] Figure 3 is the third structure diagram of a four-pipe fan coil unit in the prior art;

[0029] Figure 4 is the structure diagram of the present invention;

[0030] Figure 5 is the structure diagram of the water inlet system and the water outlet system of the present invention;

[0031] Figure 6 is the structure diagram of the water inlet system of the present invention;

[0032] Figure 7 is the structure diagram of the water outlet system of the present invention;

[0033] Figure 8 is the sectional view of the water outlet system of the present invention;

[0034] Figure 9 is the assembly diagram of the present invention;

[0035] Figure 10 is the flow chart of the present invention;

[0036] In the figure: 1, side plate; 3, baffle; 4, heating system water outlet pipe assembly; 5, refrigeration system water outlet pipe assembly; 6, refrigeration system water inlet pipe assembly; 7, heating system water inlet pipe assembly; 8, surface cooler assembly; 9, main water inlet pipe; 9.1, refrigeration main water inlet pipe; 9.2, heating main water inlet pipe; 10, main water outlet pipe; 10.1, refrigeration main water outlet pipe; 10.2, heating main water outlet pipe; 11, water inlet branch pipe; 11.1, refrigeration water inlet branch pipe; 11.2, heating water inlet branch pipe; 12, water outlet branch pipe; 12.1, refrigeration water outlet branch pipe; 12.2, heating water outlet branch pipe; 13, compression hoop; 14, first check valve; 15, refrigeration water inlet pipe; 16, heating water inlet pipe; 17, refrigeration water outlet pipe; 18, heating water outlet pipe; 20, stop valve; 21, heating system water valve; 22, opening; 23, refrigeration system water valve; 24, return water pipe; 25, refrigeration water inlet assembly; 26, heating water inlet assembly; 27, refrigeration water outlet assembly; 28, heating water outlet assembly; 29, second check valve. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] As Figures 4 - 10 shown, the present invention provides a four-pipe fan coil system and its control method. Figure 4 As the structural schematic diagram of the four-pipe fan coil system of the present invention, 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 is connected and communicated with the circulation system in the surface cooler assembly 8, and the other end extends out of the side plate 1 through the opening 22.

[0039] As Figure 4 and Figure 5 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 water inlet branch pipe 11. One end of both the refrigeration system water inlet pipe assembly 6 and the heating system water inlet pipe assembly 7 is connected and communicated with the main water inlet pipe 9. One side of the main water inlet pipe 9 is connected and communicated with a plurality of water inlet branch pipes 11. One end of the water inlet branch pipe 11 is connected to the water inlet of the circulation system in the surface cooler assembly 8.

[0040] The water outlet system includes: a heating system water outlet pipe assembly 4, a refrigeration system water outlet pipe assembly 5, a main water outlet pipe 10, and a water outlet branch pipe 12. One end of both the heating system water outlet pipe assembly 4 and the refrigeration system water outlet pipe assembly 5 is connected to the main water outlet pipe 10. One side of the main water outlet pipe 10 is connected to a plurality of water outlet branch pipes 12. One end of the water outlet branch pipe 12 is connected to the water outlet of the internal circulation system of the surface cooler assembly 8.

[0041] As Figure 4 shown, the surface cooler assembly 8 is arranged in a disc shape. A plurality of circulating water inlet pipes are arranged inside the surface cooler assembly 8 from top to bottom. The water inlets of all the circulating water inlet pipes are vertically arranged on one side of the end face of the surface cooler assembly 8 and are connected to the water inlet branch pipe 11. The circulating water inlet pipes surround inside the surface cooler assembly 8 and are 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 water outlets of the circulating water outlet pipe are sequentially arranged on the right side of the water inlets of the circulating water inlet pipes from top to bottom. The other end of the circulating water outlet pipe winds back inside the surface cooler assembly 8 and is connected to the water outlet branch pipe 12 at the corresponding water outlet at the end, forming a circulating loop. A baffle 3 is arranged between both ends of the surface cooler assembly 8.

[0042] As Figure 6 , Figure 7 and Figure 8 shown, the main water inlet pipe 9 includes: a refrigeration main water inlet pipe 9.1 and a heating main water inlet pipe 9.2. One end of the refrigeration main water inlet pipe 9.1 and the heating main water inlet pipe 9.2 is open and the other end is closed. The refrigeration system water inlet pipe assembly 6 is connected to the side wall of the refrigeration main water inlet pipe 9.1. The heating system water inlet pipe assembly 7 is connected to the side wall of the heating main water inlet pipe 9.2. A compression hoop 13 is arranged on the open side of the refrigeration main water inlet pipe 9.1 and the heating main water inlet pipe 9.2. The first one-way valve 14 is welded between the refrigeration main water inlet pipe 9.1 and the heating main water inlet pipe 9.2 through the compression hoop 13, so that the refrigeration main water inlet pipe 9.1 and the heating main water inlet pipe 9.2 are connected and communicated through the first one-way valve 14. Among them, the water inlet branch pipe 11 includes: a refrigeration water inlet branch pipe 11.1 and a heating water inlet branch pipe 11.2. A plurality of refrigeration water inlet branch pipes 11.1 are connected to the side wall of the refrigeration main water inlet pipe 9.1. A plurality of heating water inlet branch pipes 11.2 are connected to the side wall of the heating main water inlet pipe 9.2.

[0043] The main outlet pipe 10 includes: a refrigeration main outlet pipe 10.1 and a heating main outlet pipe 10.2. One end of the refrigeration main outlet pipe 10.1 and the heating main outlet pipe 10.2 is open and the other end is closed. The outlet pipe assembly 5 of the refrigeration system is connected to the side wall of the refrigeration main outlet pipe 10.1, and the outlet pipe assembly 4 of the heating system is connected to the side wall of the heating main outlet pipe 10.2. A compression hoop 13 is provided on the open side of the refrigeration main outlet pipe 10.1 and the heating main outlet pipe 10.2. The second one-way valve 29 is welded between the refrigeration main outlet pipe 10.1 and the heating main outlet pipe 10.2 through the compression hoop 13, so that the refrigeration main outlet pipe 10.1 and the heating main outlet pipe 10.2 are connected and communicated through the second one-way valve 29; among them, the outlet branch pipes 12 include: a refrigeration outlet branch pipe 12.1 and a heating outlet branch pipe 12.2. A plurality of refrigeration outlet branch pipes 12.1 are connected to the side wall of the refrigeration main outlet pipe 10.1, and a plurality of heating outlet branch pipes 12.2 are connected to the side wall of the heating main outlet pipe 10.2.

[0044] The first one-way valve 14 on the main inlet pipe 9 only allows the fluid to flow from the heating main inlet pipe 9.2 to the refrigeration main inlet pipe 9.1, and the second one-way valve 29 on the main outlet pipe 10 only allows the fluid to flow from the refrigeration main outlet pipe 10.1 to the heating main outlet pipe 10.2. A pressure automatic controller is arranged in all the one-way valves, and the one-way valves are controlled to work only during heating by different pressure differences during refrigeration and heating.

[0045] In a specific embodiment, during refrigeration, all the one-way valves are automatically closed under the influence of the refrigeration pressure difference. The cold water flowing into the refrigeration main inlet pipe 9.1 is restricted by the first one-way valve 14 and will flow into the circulation system in the surface cooler assembly 8 through the refrigeration inlet branch pipe 11.1 for heat dissipation and cooling. The circulated cold water flows out from the refrigeration outlet branch pipe 12.1 and reaches the refrigeration main outlet pipe 10.1. The cold water will flow out from the outlet pipe assembly 5 of the refrigeration system under the restriction of the second one-way valve 29; during heating, all the one-way valves operate automatically under the influence of the heating pressure difference. The hot water enters the heating main inlet pipe 9.2, and the hot water fills the entire main inlet pipe 9 along the flow direction of the first one-way valve 14 and then flows into the circulation system in the surface cooler assembly 8 through the refrigeration inlet branch pipe 11.1 and the heating main inlet pipe 11.2 together for heating, increasing the heat exchange area. The circulated hot water flows from all the outlet branch pipes 12 to the main outlet pipe 10, and the hot water in the refrigeration main outlet pipe 10.1 will flow out from the outlet pipe assembly 4 of the heating system along the second one-way valve 29.

[0046] The number and positions of the heating inlet branch pipes 11.2 and the heating outlet branch pipes 12.2 correspond to each other, and the number and positions of the refrigeration inlet branch pipes 11.1 and the refrigeration outlet branch pipes 12.1 correspond to each other.

[0047] As Figure 9As shown, the water inlet pipe assembly 6 of the refrigeration system is externally connected to the refrigeration water inlet pipe 15, and a stop valve 20 is provided on the refrigeration water inlet pipe 15. The water inlet pipe assembly 7 of the heating system is externally connected to the heating water inlet pipe 16. The control main board controls the opening and closing of the stop valve 20 through an electrical signal, so that when heating, the cold water can flow out first by controlling the opening and closing of the stop valve 20.

[0048] The water outlet pipe assembly 4 of the heating system is externally connected to the heating water outlet pipe 18, and a heating system water valve 21 is provided on the heating water outlet pipe 18. The refrigeration system water outlet pipe 5 is externally connected to the refrigeration water outlet pipe 17, and a refrigeration system water valve 23 is provided on the refrigeration water outlet pipe 17.

[0049] As Figure 10 shown, in a specific embodiment, when the air conditioner is in the refrigeration, air supply or dehumidification mode, the air conditioner performs refrigeration, the stop valve 20 is in the normally open state, the heating system water valve 21 is closed, and all check valves are automatically closed under the influence of the pressure difference during refrigeration. The cold water in the refrigeration water inlet pipe 15 flows into the refrigeration system water inlet pipe assembly 6. The cold water flowing into the refrigeration water inlet main pipe 9.1 is restricted by the flow direction of the first check valve 14 and will flow into the circulating system in the surface cooler assembly 8 through the refrigeration water inlet branch pipe 11.1 for heat dissipation and cooling. The circulated cold water flows out from the refrigeration water outlet branch pipe 12.1 to reach the refrigeration water outlet main pipe 10.1. The cold water on the refrigeration water outlet main pipe 10.1 is restricted by the second check valve 29 and will flow out from the refrigeration water outlet pipe 17 through the refrigeration system water outlet pipe assembly 5. When the air conditioner mode is not the refrigeration, air supply or dehumidification mode, the air conditioner performs heating. The control main board controls the stop valve 20 to close first, and then delays to open the heating system water valve 21 and closes the refrigeration system water valve 23, so that the previous cold water has sufficient time to flow out completely. All check valves operate automatically under the influence of the pressure difference during heating. The hot water flows into the heating system water inlet pipe assembly 6 through the heating water inlet pipe 16 to reach the heating water inlet main pipe 9.2. The hot water fills the entire inlet main pipe 9 along the flow direction of the first check valve 14 and flows into the circulating system in the surface cooler assembly 8 from all the inlet branch pipes 11 for heating, maximizing the heat exchange area, greatly improving the heating capacity without increasing the water temperature, reducing the energy consumption. The circulated hot water flows out from all the water outlet branch pipes 12 to reach the water outlet main pipe 10. The hot water in the heating water outlet main pipe 10.2 flows along the second check valve 29 into the heating system water outlet pipe assembly 4 and flows out from the heating water outlet pipe 18. The present invention realizes the sharing of the refrigeration circulating system during heating through the opening and closing of the check valve, simplifies the structure while greatly improving the heating efficiency, and further simplifies the structure of the inlet and outlet water pipes by connecting the main pipe and the branch pipe, reducing the production and assembly difficulty.

[0050] Preferably, the water in the present invention can be replaced with other media, such as chemical agents.

[0051] The present invention also provides an air conditioner, including the four-pipe fan coil system described above.

[0052] The present invention also provides a control method for an air conditioner, comprising the following steps:

[0053] Step 1: When the air conditioner is in the cooling, air supply or dehumidification mode, the air conditioner performs cooling, the cut-off valve 20 is in an open state, and the heating system water valve 21 is closed;

[0054] Step 2: All check valves are automatically closed under the influence of the pressure difference during cooling. Cold water enters the refrigeration system inlet pipe assembly 6 through the refrigeration inlet pipe 15 and reaches the inlet main pipe 9. The cold water is restricted by the flow direction of the first check valve 14 in the inlet main pipe 9 and will flow into the surface cooler assembly 8 through the refrigeration inlet branch pipe 11.1 for heat dissipation and cooling;

[0055] Step 3: The circulated cold water flows out from the refrigeration outlet branch pipe 12.1 and reaches the refrigeration outlet main pipe 10.1. The cold water is restricted by the second check valve 29 and will flow out from the refrigeration outlet pipe 17 along the refrigeration system outlet pipe assembly 5;

[0056] Step 4: When the air conditioner is not in the cooling, air supply or dehumidification mode, the air conditioner performs heating. The cut-off valve 20 is first closed, the heating system water valve 21 is delayed to be opened, and the refrigeration system water valve 23 is closed to allow the cold water to fully flow out;

[0057] Step 5: All check valves operate automatically under the influence of 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 inlet main pipe 9. The hot water fills the entire inlet main pipe 9 along the first check valve 14 and flows into the surface cooler assembly 8 through all the inlet branch pipes 11 for heating;

[0058] Step 6: The circulated hot water flows out from all the 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 check valve 29 into the heating system outlet pipe assembly 4 and flows out from the heating outlet pipe 18.

[0059] The present invention also provides a computer-readable storage medium corresponding to the control method of the air conditioner. The computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to perform the control method of the air conditioner.

[0060] The beneficial effects of the present invention are as follows. Compared with the prior art, the present invention shares a set of circulation systems for cooling and heating, simplifies the structure, reduces the floor space, is conducive to subsequent maintenance. At the same time, both the water inlet system and the water outlet system are connected by the main pipe and the branch pipe, further simplifying the structure of the inlet and outlet water pipes, reducing the production and assembly difficulty and the failure rate, and being conducive to subsequent maintenance;

[0061] One-way valves are provided on both the outlet main pipe and the inlet main pipe of the present invention. The pressure automatic controller inside the one-way valve enables the one-way valve to work only in the heating mode. Then, through the stop valve, cold water can be discharged first during heating, avoiding affecting the heating efficiency. At the same time, through the one-way valve, the hot water during heating can flow in all the inlet branch pipes, enabling the common use of the refrigeration cycle system during heating without the need to split the heating and refrigeration systems. The heating and refrigeration efficiencies are both greatly improved. At the same time, the hot water flowing in all the branch pipes maximizes the heat exchange area, significantly improving the heating capacity without increasing the water temperature, reducing the equipment energy consumption and load, and improving the equipment durability.

[0062] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer-readable storage medium having thereon computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0063] The computer-readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punched card or raised structures in grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium used herein is not construed as an instantaneous signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0064] The computer-readable program instructions described herein can be downloaded from the computer-readable storage medium to various computing / processing devices, or downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include a copper transmission cable, an optical fiber transmission, a wireless transmission, a router, a firewall, a switch, a gateway computer, and / or an edge server. The network adapter or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0065] Computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine - related instructions, microcode, firmware instructions, state - 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 be executed entirely on the user's computer, partially on the user's computer, executed as a stand - alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through 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., through the Internet using an Internet service provider). In some embodiments, by using the state information of computer - readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field - programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer - readable program instructions to implement various aspects of the present disclosure.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent substitutions. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A four-pipe fan coil unit 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). The refrigeration system water inlet pipe assembly (6) and the heating system water inlet pipe assembly (7) are both connected to the main water inlet pipe (9). The main water inlet pipe (9) includes: a refrigeration main water inlet pipe (9.1) and a heating main water inlet pipe (9.2). Both ends of the first one-way valve (14) are communicated with the refrigeration main water inlet pipe (9.1) and the heating main water inlet pipe (9.2) respectively. The first one-way valve (14) only allows fluid to flow from the heating main water inlet pipe (9.2) to the refrigeration main water inlet pipe (9.1). The refrigeration system water inlet pipe assembly (6) is externally connected to a refrigeration water inlet pipe (15), and a stop valve (20) is arranged on the refrigeration water inlet pipe (15). By opening and closing the stop valve (20), cold water can flow out first during heating. The water outlet system includes: a heating system water outlet pipe assembly (4), a refrigeration system water outlet pipe assembly (5), and a main water outlet pipe (10). The heating system water outlet pipe assembly (4) and the refrigeration system water outlet pipe assembly (5) are both connected to the main water outlet pipe (10). The main water outlet pipe (10) includes: a refrigeration main water outlet pipe (10.1) and a heating main water outlet pipe (10.2). Both ends of the second one-way valve (29) are communicated with the refrigeration main water outlet pipe (10.1) and the heating main water outlet pipe (10.2) respectively. The second one-way valve (29) only allows fluid to flow from the refrigeration main water outlet pipe (10.1) to the heating main water outlet pipe (10.2). The first one-way valve (14) and the second one-way valve (29) are internally provided with a pressure automatic controller, and all one-way valves only work during heating through the different pressure differences between heating and refrigeration.

2. The four-pipe fan coil system according to claim 1, characterized in that: One end of the refrigeration main water inlet pipe (9.1) and the heating main water inlet pipe (9.2) is open and the other end is closed. The refrigeration system water inlet pipe assembly (6) is connected to the refrigeration main water inlet pipe (9.1), and the heating system water inlet pipe assembly (7) is connected to the heating main water inlet pipe (9.2). Compression collars (13) are arranged on the open sides of the refrigeration main water inlet pipe (9.1) and the heating main water inlet pipe (9.2). The first one-way valve (14) is connected between the refrigeration main water inlet pipe (9.1) and the heating main water inlet pipe (9.2) through the compression collars (13).

3. The four-pipe fan coil system according to claim 1, characterized in that: One end of the refrigeration main water outlet pipe (10.1) and the heating main water outlet pipe (10.2) is open and the other end is closed. The refrigeration system water outlet pipe assembly (5) is connected to the refrigeration main water outlet pipe (10.1), and the heating system water outlet pipe assembly (4) is connected to the heating main water outlet pipe (10.2). Compression collars (13) are arranged on the open sides of the refrigeration main water outlet pipe (10.1) and the heating main water outlet pipe (10.2). The second one-way valve (29) is connected between the refrigeration main water outlet pipe (10.1) and the heating main water outlet pipe (10.2) through the compression collars (13).

4. The four-pipe fan coil system according to claim 1, characterized in that: The water inlet system further includes: water inlet branch pipes (11), a water inlet main pipe (9) is connected to a plurality of water inlet branch pipes (11), and the water inlet branch pipes (11) include: a refrigeration water inlet branch pipe (11.1) and a heating water inlet branch pipe (11.2), a plurality of refrigeration water inlet branch pipes (11.1) are connected to a refrigeration water inlet main pipe (9.1), and a plurality of heating water inlet branch pipes (11.2) are connected to a heating water inlet main pipe (9.2); the water outlet system further includes: water outlet branch pipes (12), a water outlet main pipe (10) is connected to a plurality of water outlet branch pipes (12), and the water outlet branch pipes (12) include: a refrigeration water outlet branch pipe (12.1) and a heating water outlet branch pipe (12.2), a plurality of refrigeration water outlet branch pipes (12.1) are connected to a refrigeration water outlet main pipe (10.1), and a plurality of heating water outlet branch pipes (12.2) are connected to a heating water outlet main pipe (10.2).

5. The four-pipe fan coil unit system according to any one of claims 2-4, characterized in that: During refrigeration, all one-way valves automatically close, and cold water only flows into the refrigeration water inlet branch pipe (11.1) and flows out from the refrigeration system water outlet pipe assembly (5); during heating, all one-way valves automatically operate, hot water will flow into all the water inlet branch pipes (11), and the hot water in the refrigeration water outlet main pipe (10.1) will flow out from the heating system water outlet pipe assembly (4) along the second one-way valve (29).

6. The four-pipe fan coil unit system according to claim 1, characterized in that: Both the water inlet branch pipe (11) and the water outlet branch pipe (12) are connected to the surface cooler assembly (8). A plurality of circulating water inlet pipes are arranged in the surface cooler assembly (8) from top to bottom. The water inlets of all the circulating water inlet pipes are arranged on the end surface of the surface cooler assembly (8) and are connected to the water inlet branch pipe (11). The circulating water inlet pipes surround inside the surface cooler assembly (8) and are 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 water outlets of the circulating water outlet pipe are sequentially arranged on the right side of the water inlets of the circulating water inlet pipes. The circulating water outlet pipe winds back inside the surface cooler assembly (8) and is connected to the water outlet branch pipe (12) at the corresponding water outlets, forming a circulating loop.

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

8. A fan coil unit, characterized in that: Comprising the four-pipe fan coil unit system according to any one of claims 1 to 7.

9. An air conditioner, characterized in that, Comprising the fan coil unit according to claim 8.

10. A control method for an air conditioner, based on the four-pipe fan coil unit system according to any one of claims 1 to 7, characterized in that: When the air conditioner is in the refrigeration, air supply or dehumidification mode, refrigeration will be carried out, the cut-off valve (20) is in the normally open state, and the heating system water valve (21) is closed; All check valves are automatically closed under the influence of the pressure difference during refrigeration. Cold water enters the main refrigeration water inlet pipe (9.1) through the refrigeration water inlet pipe (15). Restricted by the first check valve (14), the cold water will flow into the surface cooler assembly (8) through the refrigeration water inlet branch pipe (11.1) for refrigeration; The circulated cold water flows from the refrigeration water outlet branch pipe (12.1) to the main refrigeration water outlet pipe (10.1), and is restricted by the second check valve (29) and flows out through the refrigeration water outlet pipe (17); When the air conditioner is not in the refrigeration, air supply or dehumidification mode, heating will be carried out. The cut-off valve (20) is first closed, and the heating system water valve (21) is delayed to open and the refrigeration system water valve (23) is closed to allow the cold water to flow out fully; All check valves automatically operate under the influence of the pressure difference during heating. Hot water flows into the main heating water inlet pipe (9.2) through the heating water inlet pipe (16), fills the entire main water inlet pipe (9) through the first check valve (14), and flows into the surface cooler assembly (8) through all water inlet branch pipes (11) for heating; The circulated hot water flows from all water outlet branch pipes (12) to the main water outlet pipe (10), and the hot water in the main heating water outlet pipe (10.2) will flow out through the heating water outlet pipe (18) along the direction of the second check valve (29).

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to implement the air conditioner control method according to claim 10.

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