Prefabricated energy-saving fan-coil unit

Abstract

The utility model relates to an assembled energy -conserving fan -coil unit belongs to air conditioning unit technical field. Fan -coil body is equipped with water supply main, return water main, is equipped with bypass pipe between water supply main, return water main, is equipped with first gate valve on bypass pipe, water supply main, return water main end part has reserved main pipe interface, is equipped with exhaust valve, electric two -way valve, second gate valve on water supply main, is equipped with low -resistance filter, third gate valve on return water main, electric two -way valve and temperature controller electric connection, fan -coil body bottom is equipped with heat preservation water collecting tray, heat preservation water collecting tray bottom is equipped with the condensate water pipe that inclines to the down, is equipped with water seal and plug on condensate water pipe. The flange plate with heat preservation air pipe soft connection is equipped at the fan -coil body's send back air outlet, so as to be connected with the quick connection of sending back air pipe or sending back air mouth. The utility model can install fast, avoid the drip, run cold, condensate, precipitation resistance caused by improper assembly, shorten construction period and reduce operating cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of air conditioning units and relates to a prefabricated energy-saving fan coil unit. Background Technology

[0002] Fan coil units, as the most widely used terminal equipment in central air conditioning systems, play a crucial role in regulating indoor temperature and humidity in various buildings. However, their traditional installation methods present numerous troublesome technical problems, severely restricting the overall performance and operational quality of central air conditioning systems.

[0003] Currently, valves, filters, water pipe expansion joints, and air duct expansion joints at the inlet and outlet of fan coil units are generally assembled on-site using loose parts such as threaded (butt-fit) and unions. While this assembly method seems simple, it actually harbors many hidden dangers. To ensure sealing, a large amount of auxiliary materials such as PTFE tape, hemp fiber, and lead oil are required during installation. Too much or too little PTFE tape, uneven hemp fiber filling, or insufficient lead oil application—any deviation in any of these steps can lead to a poor seal. Furthermore, condensate water seals and equipment and pipe insulation also need to be fabricated on-site. On-site fabrication is not only limited by site conditions but also makes it difficult to guarantee fabrication accuracy, resulting in extremely low efficiency.

[0004] This non-standardized on-site assembly method brings problems far beyond this. With numerous components to be assembled, a multitude of joints are inevitable. The poor sealing reliability of these numerous joints becomes a prominent issue. In actual operation, leaks and cold water loss frequently occur, not only wasting water resources but also affecting indoor comfort and potentially damaging the building structure. Furthermore, the installation process is time-consuming and labor-intensive, heavily reliant on the skill level and responsibility of the workers. Different workers have varying operating techniques and experience; even the same worker may not maintain consistent installation quality at different times and under different conditions. This makes it difficult to effectively guarantee quality and creates significant risks for subsequent system maintenance. Once problems arise, troubleshooting and repair are extremely difficult, requiring substantial manpower, resources, and time.

[0005] In summary, the technical problems of traditional fan coil unit installation methods urgently need to be solved in order to promote the development of central air conditioning systems towards greater efficiency, stability, and reliability. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a prefabricated energy-saving fan coil unit that can be quickly installed, avoids leakage caused by improper on-site assembly, effectively reduces cooling loss and condensate generation, and at the same time reduces water resistance of various components, shortens the construction period and reduces operating costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A prefabricated energy-saving fan coil unit includes a fan coil body. A supply water main and a return water main are located on one side of the fan coil body, connected by a bypass pipe. A first gate valve is installed on the bypass pipe. A main pipe interface is pre-installed at the end of each of the supply and return water mains away from the fan coil body for quick connection to the air conditioning system's supply and return water mains. An air vent valve, an electric two-way valve, and a second gate valve are sequentially installed on the supply water main. A low-resistance filter and a third gate valve are sequentially installed on the return water main. The electric two-way valve is electrically connected to a thermostat for room temperature control. An insulated water collection tray is located at the bottom of the fan coil body, with its horizontal projection covering the fan coil body, the supply water main, the return water main, and the main pipe interface. A condensate drain pipe is located at the bottom of the insulated water collection tray.

[0008] Optionally, the water supply main and return main are connected to the fan coil unit body via flexible water pipe connections.

[0009] Optionally, the condensate pipe is installed at a downward angle at the bottom of the insulated water collection pan via a water pipe flexible joint.

[0010] Optionally, the tilt angle of the condensate pipe is ≥1%.

[0011] Optionally, a U-shaped water seal pipe is provided in the middle of the condensate pipe, and a removable plug is provided at the bottom of the U-shaped water seal pipe.

[0012] Optionally, the supply and return air outlets of the fan coil unit are provided with insulated air duct flexible connections.

[0013] Optionally, the length of the flexible joint in the insulated air duct is ≤300mm.

[0014] Optionally, the insulated air duct flexible joint is provided with a flange to facilitate quick connection with the supply and return air duct or supply and return air outlet.

[0015] Optionally, the fan coil unit body includes a fan, a motor, a heat exchange coil, and an external polyurethane insulation shell.

[0016] Optionally, the low-resistance filter has a pore size ≤ 1.5 mm and an effective filtration area that is more than three times the cross-sectional area of ​​the connecting pipe.

[0017] The beneficial effects of this utility model are as follows: The unit of this utility model adopts an integrated product design. Through the reserved interface, it can be quickly installed with the air conditioning system's supply and return water mains, supply and return air outlets, etc., avoiding leakage caused by improper on-site assembly, effectively reducing cold water loss and condensate generation, with good sealing performance and perfect insulation, improving the operating efficiency and stability of the entire air conditioning system; at the same time, it reduces the water resistance of each component, shortens the construction period and reduces operating costs.

[0018] Specifically, the entire fan coil unit, supply and return water pipe valves, condensate water seal, supply and return air flexible joints, and their insulation are shipped as a prefabricated product, reducing on-site assembly time and preventing leaks and cold air loss caused by improper connections. Furthermore, individual valves can be disassembled independently for maintenance and replacement without affecting the overall system operation. All valve assemblies and components utilize low-resistance equipment, and seamless connections between components reduce water resistance in pipe connections, improving system energy efficiency. The condensate pipe is equipped with a U-shaped water seal, the water seal height of which is factory-configured based on the coil's static pressure, preventing omissions or reliance on experience that could lead to poor condensate drainage and airflow short-circuiting, affecting air conditioning performance. The equipment, condensate tray, water pipe valve assemblies, and inlet and return air vents use self-insulated flexible joints, avoiding condensation caused by uninsulated duct joints or inadequate insulation.

[0019] Because the valve assembly and components can be seamlessly connected, the length of the valve assembly is shortened. The length of the insulated water collection tray just exceeds the reserved main pipe interface of the supply and return water valve assembly, which can collect any drips at the interface into the water collection tray and avoid affecting the ceiling. The bypass pipe added between the supply and return water pipes can facilitate pipe flushing and avoid clogging the fan coil unit.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a structural schematic diagram of the prefabricated energy-saving fan coil unit of this utility model.

[0022] Figure label: 1. Fan coil unit body; 2. Water supply main pipe; 3. Water return main pipe; 41. First gate valve; 42. Second gate valve; 43. Third gate valve; 5. Electric two-way valve; 6. Air vent valve; 7. Low-resistance filter; 8. Water pipe flexible joint; 9. Insulated water collection tray; 10. Insulated air duct flexible joint; 11. Condensate pipe; 12. Flange; 13. Water pipe insulation; 14. Main pipe interface; 15. Thermostat; 16. Bypass pipe; 17. Plug. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Example 1 Please see Figure 1This is a prefabricated energy-saving fan coil unit, including a fan coil unit body 1. A water supply main pipe 2 and a return main pipe 3 are provided on one side of the fan coil unit body 1. The water supply main pipe 2 and the return main pipe 3 are connected to the fan coil unit body 1 via flexible water pipe connectors 8. The water supply main pipe 2 and the return main pipe 3 are connected by a bypass pipe 16, which is equipped with a first gate valve 41. The ends of the water supply main pipe 2 and the return main pipe 3 away from the fan coil unit body 1 are respectively provided with main pipe interfaces 14 for quick connection to the air conditioning system's water supply and return main pipes. An air vent valve 6, an electric two-way valve 5, and a second gate valve 42 are sequentially provided on the water supply main pipe 2. A low-resistance filter 7 and a third gate valve 43 are sequentially provided on the return main pipe 3. The gate valves, electric two-way valve 5, low-resistance filter 7, and flexible connectors can be directly connected in sequence without the need for additional pipe sections in the middle, and the valves can be disassembled independently for maintenance and replacement. All pipes and valves in the overall unit of this utility model are equipped with heat preservation measures.

[0027] Furthermore, the electric two-way valve 5 is electrically connected to the thermostat 15, which can switch the electric two-way valve 5 on and off to control the room temperature.

[0028] Furthermore, the bottom of the fan coil unit body 1 is provided with an insulated water collection tray 9, the horizontal projection range of which covers the fan coil unit body 1, the water supply main pipe 2, the return water main pipe 3 and the main pipe interface 14; the bottom of the insulated water collection tray 9 is provided with a condensate pipe 11.

[0029] Example 2 Based on the above embodiments, this embodiment further specifies that the condensate pipe 11 is inclined downwards at the bottom of the insulated water collection pan 9 via the water pipe flexible joint 8, with an inclination angle ≥1%, to ensure that the condensate flows in the prescribed direction; in some embodiments of this utility model, the inclination angle is preferably 1%. A U-shaped water seal pipe is provided in the middle of the condensate pipe 11, and a removable plug 17 is provided at the bottom of the U-shaped water seal pipe for easy unblocking and cleaning during seasonal changes; the water seal height is determined based on several static pressures such as 15Pa, 30Pa, and 50Pa. A water pipe insulation 13 is also provided at the end of the condensate pipe 11. The water pipe insulation 13 and the pipe valve are manufactured using a polyurethane integrated molding process, resulting in tight joints that significantly reduce cold bridging and cold loss caused by insulation defects.

[0030] The installation of the insulated water collection tray 9 and the condensate pipe 11 ensures that even if the joints become slightly loose during operation, the dripping water will be collected by the insulated water collection tray 9 and discharged through the condensate pipe 11, thus avoiding damage to the ceiling.

[0031] Example 3 Furthermore, the fan coil unit body 1 is equipped with an insulated air duct flexible joint 10 at the supply and return air outlets. The end of the insulated air duct flexible joint 10 is provided with a flange 12 for quick connection to the supply and return air duct or supply and return air outlet. The length of the insulated air duct flexible joint 10 is ≤300mm.

[0032] The fan coil unit body 1 includes a fan, a motor, a heat exchange coil, and an external polyurethane insulation shell; during the manufacturing process, the water pipes and valves are assembled in the factory, and the external polyurethane insulation shell is formed in one piece.

[0033] The low-resistance filter 7 has a pore size of ≤1.5mm, and the effective filtration area is more than 3 times the cross-sectional area of ​​the connecting pipe.

[0034] The operation process of this utility model is as follows: During the installation of the fan coil unit 1 and system flushing, the second gate valve 42 and the third gate valve 43 on the supply and return water mains 3 are closed to protect the electric two-way valve 5, the low-resistance filter 7, and the fan coil unit 1. The first gate valve 41 on the bypass pipe 16 is opened to flush the system pipeline. After flushing, the first gate valve 41 on the bypass pipe 16 is closed, and the second gate valve 42 and the third gate valve 43 on the supply and return water mains 3 are opened, allowing the system to operate stably. When the low-resistance filter 7, the electric two-way valve 5, or the fan coil unit needs maintenance or replacement, the second gate valve 42 and the third gate valve 43 on the supply and return water mains 3 are closed, and the component requiring maintenance is removed and replaced without affecting system operation.

[0035] The unit of this utility model adopts an integrated product design. Through the reserved interface, it can be quickly installed with the air conditioning system's supply and return water mains, supply and return air outlets, etc., avoiding leakage caused by improper on-site assembly, effectively reducing cold water loss and condensate generation, with good sealing performance and perfect insulation, improving the operating efficiency and stability of the entire air conditioning system; at the same time, it reduces the water resistance of each component, shortens the construction period and reduces operating costs.

[0036] Specifically, the entire fan coil unit, supply and return water pipe valves, condensate water seal, supply and return air flexible joints, and their insulation are shipped as a prefabricated product, reducing on-site assembly time and preventing leaks and cold air loss caused by improper connections. Furthermore, individual valves can be disassembled independently for maintenance and replacement without affecting the overall system operation. All valve assemblies and components use low-resistance equipment, and seamless connections between components reduce water resistance in pipe connections, improving system efficiency. A U-shaped water seal is installed on the condensate pipe 11, with the water seal height configured at the factory based on the coil's static pressure, avoiding omissions or reliance on experience that could lead to poor condensate drainage and airflow short-circuiting, affecting air conditioning performance. The equipment, condensate tray, water pipe valve assemblies, and inlet and return air vents use self-insulated flexible joints, preventing condensation caused by using uninsulated duct flexible joints 10 or improper insulation.

[0037] Because the valve assembly and components can be seamlessly connected, the length of the valve assembly is shortened. The length of the insulated water collection tray 9 just exceeds the reserved main pipe interface 14 of the supply and return water valve assembly, which can collect the drips at the interface into the water collection tray and avoid affecting the ceiling. The bypass pipe 16 added between the supply and return water pipes can facilitate pipe flushing and avoid clogging the fan coil unit.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A prefabricated energy-saving fan coil unit, characterized in that: The system includes a fan coil unit body (1), on one side of which a water supply main pipe (2) and a return main pipe (3) are provided. The water supply main pipe (2) and the return main pipe (3) are connected by a bypass pipe (16), and a first gate valve (41) is provided on the bypass pipe (16). The water supply main pipe (2) and the return main pipe (3) are respectively provided with a main pipe interface (14) at the end away from the fan coil unit body (1) to facilitate quick connection with the air conditioning system's water supply and return main pipes. An air vent valve (6) and an electric second valve are provided in sequence on the water supply main pipe (2). The system includes a through valve (5) and a second gate valve (42); a low-resistance filter (7) and a third gate valve (43) are sequentially installed on the return water main pipe (3); the electric two-way valve (5) is electrically connected to the thermostat (15) to control the room temperature; the bottom of the fan coil unit body (1) is provided with an insulated water collection tray (9), and the horizontal projection range of the insulated water collection tray (9) covers the fan coil unit body (1), the water supply main pipe (2), the return water main pipe (3) and the main pipe interface (14); the bottom of the insulated water collection tray (9) is provided with a condensate pipe (11).

2. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: The water supply main (2) and the return water main (3) are respectively connected to the fan coil body (1) through water pipe flexible connectors (8).

3. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: The condensate pipe (11) is installed at the bottom of the heat-insulating water collection pan (9) by means of a water pipe flexible joint (8).

4. The prefabricated energy-saving fan coil unit according to claim 3, characterized in that: The tilt angle of the condensate pipe (11) is ≥1%.

5. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: A U-shaped water seal pipe is provided in the middle of the condensate pipe (11), and a removable plug (17) is provided at the bottom of the U-shaped water seal pipe.

6. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: The fan coil unit body (1) is provided with a flexible insulated air duct (10) at the air supply and return outlet.

7. The prefabricated energy-saving fan coil unit according to claim 6, characterized in that: The length of the flexible joint (10) of the insulated air duct is ≤300mm.

8. The prefabricated energy-saving fan coil unit according to claim 6, characterized in that: The insulated air duct flexible connector (10) is provided with a flange (12) to facilitate quick connection with the supply and return air duct or supply and return air outlet.

9. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: The fan coil unit body (1) includes a fan, a motor, a heat exchange coil, and an external polyurethane insulation shell.

10. The prefabricated energy-saving fan coil unit according to claim 1, characterized in that: The low-resistance filter (7) has a pore size ≤ 1.5 mm and an effective filtration area that is more than 3 times the cross-sectional area of ​​the connecting pipe.

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