Groundable warm built-in valve air disc

Abstract

The application belongs to the technical field of air conditioning equipment, and relates to a built-in valve air disc capable of being connected with a floor heating system, which comprises a shell, a fan assembly arranged in the shell and a heat exchange device. The shell has a valve body accommodating cavity in the interior. The valve body accommodating cavity is provided with at least an air disc water inlet pipe connected with an inlet of the heat exchange device and an air disc water return pipe connected with an outlet of the heat exchange device. The air disc water return pipe is connected with at least two floor heating connecting pipes which form a passage with a floor heating pipe line. The air disc water return pipe is connected with the air disc water inlet pipe through a bypass pipe at the upstream end of the at least two floor heating connecting pipes. The built-in air disc, floor heating and bypass mode realizes dual supply of the air disc and the floor heating. Four control logics, i.e. only the air disc, only the floor heating, bypass and dual circulation of the air disc and the floor heating, can be realized according to requirements. The floor heating connecting pipes are directly arranged in the air disc, and do not need to be led out from a distribution center, so that the length of the floor heating pipe line is greatly reduced, and a valve position on the pipe line is avoided from becoming an external leakage point.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning equipment technology, and relates to a fan coil unit, and more particularly to a fan coil unit with an internal valve that can be grounded and heated. Background Technology

[0002] Fan coil units, also known as fan coil units or fan coil units, are one of the terminal devices in an air conditioning system, consisting of a small fan, an electric motor, and a coil (air heat exchanger). When chilled or hot water flows through the coil, it exchanges heat with the outside air, cooling, dehumidifying, or heating the air to regulate indoor air parameters. They are commonly used terminal devices for cooling and heating. Traditional fan coil units use external electric valves or motorized valves to control their operation, limiting their functionality to a single control logic: switching the fan coil unit on and off.

[0003] Currently, some combined heat and power (CHP) devices also enable switching between fan coil units and underfloor heating. For example, Chinese utility model patent CN214172429U discloses a ground source heat pump unit connected to a fan coil unit and a switching module, with an underfloor heating two-way valve between the ground source heat pump unit and the switching module, and the underfloor heating two-way valve being electrically connected to the switching module.

[0004] The above technical solution, through the control of the underfloor heating two-way valve, eliminates the need to manually close the winter valve during the summer, improving system convenience. However, the underfloor heating pipes in the room are distributed from a distant manifold, and the pipes are relatively long and located outside the fan coil unit. If not installed properly, they can easily become leak points. Inadequate insulation can cause condensation on the valve body, which in turn wets the ceiling plasterboard. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a built-in valve fan coil unit that can be grounded for heating;

[0006] This invention creatively proposes a built-in valve fan coil unit compatible with underfloor heating, comprising a housing, a fan assembly and a heat exchange device disposed within the housing, wherein the housing has a valve body receiving cavity, and the valve body receiving cavity is provided with at least a fan coil inlet pipe connected to the inlet of the heat exchange device and a fan coil return pipe connected to the outlet of the heat exchange device, and at least two underfloor heating pipes forming a passage with the underfloor heating pipeline are connected to the fan coil inlet pipe at the upstream end of at least two underfloor heating pipes through a bypass pipe;

[0007] The built-in valve fan disc has:

[0008] The fan coil circulation mode is characterized by the bypass pipe being disconnected, at least one of the two underfloor heating pipes being disconnected, and the fan coil inlet pipe and fan coil return pipe being connected through a heat exchange device.

[0009] A floor heating circulation mode in which the fan coil inlet pipe and / or fan coil return pipe are disconnected from the heat exchange device, the fan coil return pipe between the two floor heating pipes is disconnected, and the fan coil inlet pipe, bypass pipe, fan coil return pipe inlet, two floor heating pipes and fan coil return pipe outlet are connected in sequence.

[0010] A dual-circulation mode in which the return pipe of the fan coil unit between the two underfloor heating pipes is disconnected and the inlet pipe of the fan coil unit, the heat exchange device, the inlet of the return pipe of the fan coil unit, the two underfloor heating pipes and the outlet of the return pipe of the fan coil unit are connected in sequence.

[0011] And a bypass mode in which the fan coil inlet pipe and / or fan coil return pipe are disconnected from the heat exchange device, at least one of the two underfloor heating pipes is disconnected, and the fan coil inlet pipe and fan coil return pipe are connected through a bypass pipe.

[0012] This invention achieves dual-supply of fan coil unit and underfloor heating through a built-in fan coil unit, underfloor heating, and bypass. It can implement four control logics according to needs: fan coil unit only, underfloor heating only, bypass, and dual circulation of fan coil unit and underfloor heating. The underfloor heating pipes are directly installed within the fan coil unit, eliminating the need to extend them from the distribution center, significantly reducing the length of the underfloor heating pipes and lowering material costs and installation difficulty. Furthermore, by placing all pipes within the fan coil unit housing, valve locations on the pipes are prevented from becoming external leakage points.

[0013] In the above-mentioned type of underfloor heating built-in valve fan coil unit, an underfloor heating three-way valve is provided at the connection end between the fan coil return water pipe and at least one of the two underfloor heating pipes. The underfloor heating three-way valve has a first working position that connects the upstream and downstream of the fan coil return water pipe and blocks the fan coil return water pipe from the underfloor heating pipe, and a second working position that connects the underfloor heating pipe and the fan coil return water pipe and blocks the fan coil return water pipe from the side of the other underfloor heating pipe.

[0014] In the aforementioned type of underfloor heating built-in valve fan coil unit, the two underfloor heating pipes include an underfloor heating water supply pipe and an underfloor heating water return pipe arranged sequentially along the return water direction of the fan coil unit's return water pipe. The fan coil unit's return water pipe is connected to the underfloor heating water return pipe through an underfloor heating three-way valve.

[0015] The three-way valve for underfloor heating can be used to open or close the return water path of the underfloor heating system. The three-way valve is located on the return water side of the underfloor heating system to ensure a tight seal.

[0016] In the aforementioned type of built-in valve fan coil unit compatible with underfloor heating, the underfloor heating three-way valve includes a first valve body connecting the upstream and downstream ends of the fan coil unit's return water pipe and the underfloor heating pipe, a first partition plate disposed within the first valve body and arranged along its inner side wall, and a first valve stem assembly movably disposed within the first valve body. The first partition plate is provided with a first through hole, through which the first valve stem assembly passes. In the first working position, the first valve stem assembly blocks the underfloor heating pipe, thereby opening the first through hole. In the second working position, it blocks the first through hole, thereby connecting the underfloor heating pipe to the fan coil unit's return water pipe.

[0017] In the aforementioned type of underfloor heating built-in valve fan, an underfloor heating water supply control valve is provided at the inlet end of the underfloor heating water supply pipe. This valve controls the flow of water to and from the underfloor heating system and can be operated manually or electrically.

[0018] In the aforementioned type of ground-heated built-in valve fan coil unit, the fan coil return water pipe is connected to a bypass pipe via a bypass reversing valve. The bypass reversing valve has a first working position that connects to the bypass pipe and blocks the fan coil inlet water pipe and / or the fan coil return water pipe from the heat exchange device, and a second working position that connects the fan coil inlet water pipe and / or the fan coil return water pipe to the heat exchange device and blocks the bypass reversing valve.

[0019] The built-in bypass pipe avoids frequent start-stop of the main unit caused by low flow at the end of the system, thereby avoiding main unit failure, simplifying on-site construction procedures, and reducing the risk of water leakage.

[0020] In the aforementioned type of in-ground heating built-in valve fan coil unit, the bypass reversing valve includes a second valve body connecting the upstream and downstream ends of the fan coil unit's return water pipe and a bypass pipe, a second partition plate disposed within the second valve body and arranged along its inner sidewall, and a second valve stem assembly movably disposed within the second valve body. The second partition plate has a second through hole, through which the second valve stem assembly passes. In the first working position, the second valve stem assembly blocks the second through hole to connect the bypass pipe with the fan coil unit's return water pipe. In the second working position, it blocks the connection between the bypass pipe and the fan coil unit's return water pipe to open the second through hole.

[0021] In the aforementioned type of ground-heated built-in valve fan coil unit, a bypass flow control valve is provided at the inlet end of the bypass pipe. The bypass flow control valve can be controlled manually or electrically. This valve can regulate the water flow rate; it can even close the bypass pipe completely, opening it when the water flow in the system is insufficient to protect the main unit from frequent motor start-stop cycles.

[0022] In the aforementioned type of underfloor heating fan coil unit with built-in valve, the underfloor heating three-way valve and the bypass reversing valve are equipped with electric heating / electric controllers, allowing the room control panel to be directly connected to the fan coil unit's circuit, greatly reducing wiring length.

[0023] In the aforementioned type of underfloor heating built-in valve fan coil unit, a fan coil unit supply water temperature sensor is installed on the fan coil unit inlet pipe, a fan coil unit return water temperature sensor is installed on the fan coil unit return water pipe, an underfloor heating supply water temperature sensor is installed on the underfloor heating supply water pipe, and an underfloor heating return water temperature sensor is installed on the underfloor heating return water pipe. The fan coil unit supply water temperature sensor, fan coil unit return water temperature sensor, underfloor heating supply water temperature sensor, and underfloor heating return water temperature sensor control the underfloor heating three-way valve and bypass reversing valve through an electric heating / electric controller.

[0024] In the aforementioned type of built-in valve fan coil unit that can be used for underfloor heating, the inlet of the fan coil unit's inlet pipe, the outlet of the fan coil unit's return pipe, and the underfloor heating interface of the underfloor heating pipe are connected to the outside of the housing, and a drainage mechanism is provided below the valve body's receiving cavity.

[0025] In the aforementioned type of built-in valve fan that can be grounded and heated, the drainage mechanism includes a water receiving tray, one end of which is provided with a centralized drainage area, which is provided with a gravity drainage outlet that communicates with the outside.

[0026] In the aforementioned type of built-in valve fan plate that can be grounded and heated, the centralized drainage area is provided with a downwardly recessed lift pump suction area, and a lift pump that draws water from the lift pump suction area is provided above the water receiving plate.

[0027] In the aforementioned type of built-in valve fan plate that can be grounded and heated, the water receiving plate is symmetrical along the central plane, the axis of the gravity drain port coincides with the central plane, and the water receiving plate is symmetrically provided with mounting parts that cooperate with the shell on both sides of the central plane. The water receiving plate is provided with a drainage slope that is high in the middle and low on both sides below the heat exchange device. A drainage channel is provided on both sides of the lower part of the drainage slope. The drainage channel connects to the centralized drainage area. The height of the drainage slope, the drainage channel and the centralized drainage area decreases in a step-like manner. A level mounting groove is provided on one side of the water receiving plate.

[0028] Compared with the prior art, the advantages of the present invention are as follows:

[0029] 1) This invention employs a built-in fan coil unit, underfloor heating, and bypass to achieve dual power supply for both the fan coil unit and underfloor heating. It can implement four control logics according to requirements: fan coil unit only, underfloor heating only, bypass, and dual circulation of both fan coil unit and underfloor heating. The underfloor heating pipes are directly installed within the fan coil unit, eliminating the need for routing from the distribution center, significantly reducing the length of the underfloor heating pipes, lowering material costs and installation difficulty, and consequently reducing the length of the control circuit. Furthermore, by placing each pipe within the fan coil unit housing, valve locations on the pipes are prevented from becoming external leakage points.

[0030] 2) This invention has a built-in bypass pipe, which avoids frequent start-stop of the host due to low flow at the end of the system, thereby avoiding host failure, simplifying on-site construction procedures, and reducing the risk of water leakage.

[0031] 3) The present invention can realize the opening and closing of the underfloor heating circulating water circuit through the underfloor heating three-way valve. The underfloor heating three-way valve is set on the underfloor heating return water side to ensure the underfloor heating is sealed.

[0032] 4) The water tray of this invention improves drainage efficiency by draining water in stages, avoids the accumulation of condensate, keeps the entire water tray clean and hygienic, and reduces the problem of bacterial growth caused by condensate accumulation.

[0033] 5) The water receiving trays of this invention are symmetrically arranged, which can realize the solution of connecting pipes on different sides of the fan, and is not affected by the position of the fins. The same water receiving tray can meet both left and right connection forms, reducing inventory pressure and production costs. Attached Figure Description

[0034] Figure 1 This is a perspective view of a built-in valve air disc provided by the present invention.

[0035] Figure 2 This is an internal structural diagram of a built-in valve air disc provided by the present invention.

[0036] Figure 3 This is a structural diagram of a pipeline assembly provided by the present invention.

[0037] Figure 4 This is a structural diagram of a pipeline component in bypass mode provided by the present invention.

[0038] Figure 5 This is a structural diagram of a pipe assembly under a fan coil circulation mode provided by the present invention.

[0039] Figure 6 This is a structural diagram of a pipe assembly in a floor heating circulation mode provided by the present invention.

[0040] Figure 7 This is a structural diagram of a pipe assembly under a dual-circulation mode for underfloor heating provided by the present invention.

[0041] Figure 8 This is a structural diagram of a water receiving tray provided by the present invention.

[0042] Figure 9 This is a bottom view of a built-in valve fan disc provided by the present invention.

[0043] In the diagram: 1. Housing; 110. Air outlet; 130. Fresh air inlet; 2. Fan assembly; 3. Heat exchange device; 4. Valve body cavity; 501. Fan coil inlet pipe; 502. Fan coil return pipe; 503. Bypass pipe; 504. Underfloor heating supply pipe; 505. Underfloor heating return pipe; 610. Underfloor heating three-way valve; 611. First valve body; 612. First partition plate; 613. First valve stem assembly; 614. First through hole; 620. Bypass reversing valve; 621. Second valve body; 622. Second partition plate; 623. Second valve stem assembly. Second through hole 624, bypass flow control valve 630, underfloor heating water supply control valve 640, drainage mechanism 7, water receiving tray 701, centralized drainage area 702, gravity drain outlet 703, lift pump 704, installation part 705, drainage ramp 706, drainage channel 707, level mounting groove 708, lift pump suction area 709, fan coil water supply temperature sensor 801, fan coil water return temperature sensor 802, underfloor heating water supply temperature sensor 803, underfloor heating water return temperature sensor 804. Detailed Implementation

[0044] The following specific examples further illustrate this point;

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0046] like Figures 1-9 As shown, in this embodiment, the front is defined as the side of the air outlet 110 and the bottom is defined as the side of the drainage mechanism 7.

[0047] The built-in valve fan coil unit that can be grounded and heated includes a housing 1, a fan assembly 2 and a heat exchange device 3 disposed in the housing 1.

[0048] like Figure 1 , Figure 2 and Figure 9 As shown, the housing 1 has an air outlet 110 at the front and fresh air inlets 130 on the sides, back, and bottom. The fan assembly 2 is located at the rear of the housing 1, and the heat exchange device 3, which is a surface cooler, is located in front of the fan assembly 2. The fan assembly 2 causes the fresh air introduced through the fresh air inlet 130 to pass through the heat exchange device 3 and be blown out from the air outlet 110, thus achieving heat exchange of the fresh air.

[0049] The housing 1 has a valve body receiving cavity 4 inside, which contains a pipeline assembly and a valve assembly connected to the pipeline assembly.

[0050] like Figures 2-7 As shown, the piping assembly includes a fan coil inlet pipe 501 connected to the inlet of the heat exchanger 3, a fan coil return pipe 502 connected to the outlet of the heat exchanger 3, a floor heating supply pipe 504 and a floor heating return pipe 505 sequentially connected to the fan coil return pipe 502 along the return water direction, and a bypass pipe 503 connecting the fan coil return pipe 502 and the fan coil inlet pipe 501. The bypass pipe 503 is located upstream of the floor heating supply pipe 504 and the floor heating return pipe 505 at the connection point of the fan coil return pipe 502.

[0051] A floor heating three-way valve 610 is installed at the connection end between the fan coil return water pipe 502 and the floor heating return water pipe 505. The floor heating three-way valve 610 allows for the opening and closing of the floor heating return water circuit. Located on the floor heating return side, the three-way valve 610 ensures a tight seal in the floor heating system. A floor heating water supply control valve 640 is installed at the inlet end of the floor heating water supply pipe 504. This valve allows for the opening and closing of the floor heating water supply circuit and can be controlled manually or electrically. The floor heating water supply control valve 640 can be a commercially available product and will not be described in detail in this embodiment.

[0052] The underfloor heating three-way valve 610 includes a first valve body 611 connecting the upstream and downstream ends of the fan coil return water pipe 502 and the underfloor heating return water pipe 505, a first partition 612 disposed within the first valve body 611 and arranged along its inner sidewall, and a first valve stem assembly 613 movably disposed within the first valve body 611. The first partition 612 has a first through hole 614, which is axially opposite to the outlet end of the underfloor heating return water pipe 505. The first valve stem assembly 613 passes through the first through hole 614 and moves axially between the outlet end of the underfloor heating return water pipe 505 and the first through hole 614 through a first sealing head. In the first working position, the first valve stem assembly 613 seals the outlet end of the underfloor heating return water pipe 505, thereby opening the first through hole 614. In the second working position, it seals the first through hole 614, thereby connecting the outlet end of the underfloor heating return water pipe 505 to the fan coil return water pipe 502.

[0053] The fan coil return water pipe 502 is connected to the bypass pipe 503 via a bypass reversing valve 620. The bypass pipe 503 has a built-in inlet end equipped with a bypass flow control valve 630, which can be controlled manually or electrically. This avoids frequent start-ups and shutdowns of the main unit caused by low flow at the system's end, thus preventing main unit failure, simplifying on-site construction procedures, and reducing the risk of leakage.

[0054] The bypass reversing valve 620 includes a second valve body 621 connecting the upstream and downstream ends of the fan coil return water pipe 502 and the bypass pipe 503. A second partition 622 is disposed within the second valve body 621 and arranged along its inner wall. A second valve stem assembly 623 is movably disposed within the second valve body 622. The second partition 622 has a second through hole 624 axially opposite to the outlet end of the bypass pipe 503. The second valve stem assembly 623 passes through the second through hole 624 and moves axially between the outlet end of the bypass pipe 503 and the second through hole 624 via a second sealing head. In the first working position, the second valve stem assembly 623 blocks the second through hole 624, connecting the bypass pipe 503 to the end of the fan coil return water pipe 502. In the second working position, it blocks the connection between the bypass pipe 503 and the fan coil return water pipe 502, opening the second through hole 624 to connect the fan coil return water pipe 502 to the heat exchange device 3.

[0055] The underfloor heating three-way valve 610 and the bypass reversing valve 620 are equipped with electric heating / electric controllers (not shown in the figure), which allows the room control panel to be directly connected to the circuit of the fan coil unit, greatly reducing the wiring length.

[0056] A fan coil unit inlet pipe 501 is equipped with a fan coil unit supply water temperature sensor 801, a fan coil unit return water temperature sensor 802 is equipped with a fan coil unit return water temperature sensor 802, a floor heating supply water temperature sensor 803 is equipped with a floor heating supply water temperature sensor 504, and a floor heating return water temperature sensor 804 is equipped with a floor heating return water temperature sensor 804. The fan coil unit supply water temperature sensor 801, fan coil unit return water temperature sensor 802, floor heating supply water temperature sensor 803, and floor heating return water temperature sensor 803 control the floor heating three-way valve 610 and the bypass reversing valve 620 via an electric heating / electric controller. Control conditions can be set according to usage requirements to achieve automatic switching between four modes.

[0057] The inlet of the fan coil water inlet pipe 501, the outlet of the fan coil water return pipe 502, and the underfloor heating interface of the underfloor heating pipe are connected to the outside of the housing 1.

[0058] like Figure 1 , Figure 8 and Figure 9 As shown, a drainage mechanism 7 is provided below the valve body receiving cavity 4.

[0059] The drainage mechanism 7 includes a water receiving tray 701, and a centralized drainage area 702 is provided at one end of the water receiving tray 701. The centralized drainage area 702 is provided with a gravity drainage outlet 703 that communicates with the outside.

[0060] The centralized drainage area 702 is provided with a downwardly recessed lift pump suction area 709, and a lift pump 704 is provided above the water receiving tray 701 to draw water from the lift pump suction area 709.

[0061] The water receiving tray 701 is symmetrical along the central plane, the axis of the gravity drain outlet 703 coincides with the central plane, and the water receiving tray 701 is symmetrically provided with mounting parts 705 that cooperate with the shell 1 on both sides of the central plane. The water receiving tray 701 is provided with a drainage ramp 706 that is high in the middle and low on both sides below the heat exchange device 3. Drainage channels 707 are provided on the lower sides of the drainage ramp 706. The drainage channels 707 are connected to the centralized drainage area 702. The heights of the drainage ramp 706, drainage channels 707 and centralized drainage area 702 decrease in a step-like manner. A level mounting groove 708 is provided on one side of the water receiving tray 701.

[0062] The built-in valve fan coil unit has the following four operating modes:

[0063] like Figure 4 The diagram shows the bypass mode. The underfloor heating three-way valve 610 is in the first working position, the bypass reversing valve 620 is in the first working position, the fan coil return water pipe 502 is disconnected from the heat exchange device 3, the connection between the underfloor heating return water pipe 505 and the fan coil return water pipe 502 is disconnected, and the fan coil inlet pipe 501, the bypass pipe 503 and the fan coil return water pipe 502 form a passage.

[0064] like Figure 5The diagram shows the fan coil circulation mode. The underfloor heating three-way valve 610 is in the first working position, the bypass reversing valve 620 is in the second working position, the fan coil return water pipe 502 is connected to the heat exchange device 3, the connection between the underfloor heating return water pipe 505 and the fan coil return water pipe 502 is disconnected, and the fan coil inlet water pipe 501, the heat exchange device 3 and the fan coil return water pipe 502 form a passage for fan coil heat exchange.

[0065] like Figure 6 The diagram shows the underfloor heating circulation mode. The underfloor heating three-way valve 610 is in the second working position, the bypass reversing valve 620 is in the first working position, the fan coil return water pipe 502 is disconnected from the heat exchange device 3, and the connection between the underfloor heating return water pipe 505 and the fan coil return water pipe 502 is connected. The fan coil inlet pipe 501, bypass pipe 503, inlet of fan coil return water pipe 502, underfloor heating supply pipe 504, underfloor heating pipeline, underfloor heating return water pipe 505 and outlet of fan coil return water pipe 502 form a passage for underfloor heating circulation.

[0066] like Figure 7 The diagram shows the dual-circulation mode of the fan coil floor heating system. The floor heating three-way valve 610 is in the second working position, the bypass reversing valve 620 is in the second working position, the fan coil return water pipe 502 is connected to the heat exchange device 3, the connection between the floor heating return water pipe 505 and the fan coil return water pipe 502 is connected, and the fan coil inlet pipe 501, the heat exchange device 3, the inlet of the fan coil return water pipe 502, the floor heating supply water pipe 504, the floor heating pipeline, the floor heating return water pipe 505, and the outlet of the fan coil return water pipe 502 are connected in sequence to form the dual-circulation mode of the fan coil floor heating system.

[0067] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0068] Although this article extensively uses the following components: shell 1, air outlet 110, fresh air interface 130, fan assembly 2, heat exchange device 3, valve body receiving cavity 4, fan coil inlet pipe 501, fan coil return pipe 502, bypass pipe 503, underfloor heating supply pipe 504, underfloor heating return pipe 505, underfloor heating three-way valve 610, first valve body 611, first partition 612, first valve stem assembly 613, first through hole 614, bypass reversing valve 620, second valve body 621, second partition 622, and second valve stem assembly 62... 3. Terms such as second through hole 624, bypass flow control valve 630, underfloor heating water supply control valve 640, drainage mechanism 7, water receiving tray 701, centralized drainage area 702, gravity drain outlet 703, lift pump 704, installation part 705, drainage ramp 706, drainage channel 707, level mounting slot 708, lift pump suction area 709, fan coil unit water supply temperature sensor 801, fan coil unit return water temperature sensor 802, underfloor heating water supply temperature sensor 803, and underfloor heating return water temperature sensor 804 are used. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A built-in valve fan coil unit for ground heating, comprising a housing (1), a fan assembly (2) disposed in the housing (1), and a heat exchange device (3), characterized in that: The housing (1) has a valve body receiving cavity (4) inside. The valve body receiving cavity (4) is provided with at least a fan coil inlet pipe (501) connected to the inlet of the heat exchange device (3) and a fan coil return pipe (502) connected to the outlet of the heat exchange device (3). The fan coil return pipe (502) is connected to at least two floor heating pipes that form a passage with the floor heating pipes. The fan coil return pipe (502) is connected to the fan coil inlet pipe (501) through a bypass pipe (503) at the upstream end of at least two floor heating pipes. The built-in valve fan coil unit has a fan coil circulation mode in which the bypass pipe (503) is disconnected, at least one of the two underfloor heating pipes is disconnected, and the fan coil inlet pipe (501) and fan coil return pipe (502) are connected through a heat exchange device (3). The fan coil inlet pipe (501) and / or the fan coil return pipe (502) are disconnected from the heat exchange device (3), the fan coil return pipe (502) between the two underfloor heating pipes is disconnected, and the fan coil inlet pipe (501), bypass pipe (503), and fan coil return pipe (502) are connected... The floor heating circulation mode is characterized by the inlet, two floor heating pipes and the outlet of the fan coil return pipe (502) being connected in sequence; the dual circulation mode is characterized by the fan coil return pipe (502) being disconnected between the two floor heating pipes and the fan coil inlet pipe (501), heat exchange device (3), inlet of fan coil return pipe (502), two floor heating pipes and downstream of fan coil return pipe (502) being connected in sequence; and the fan coil inlet pipe (501) and / or fan coil return pipe (502) being disconnected from the heat exchange device (3) and the two floor heating pipes being connected in sequence. The system is configured in a bypass mode where at least one section of the pipe is disconnected and the fan coil inlet pipe (501) and fan coil return pipe (502) are connected via a bypass pipe. A floor heating three-way valve (610) is installed at the connection end between the fan coil return pipe (502) and at least one of the two floor heating pipes. This three-way valve (610) has a first working position that connects the upstream and downstream sides of the fan coil return pipe (502) and blocks the connection between the fan coil return pipe (502) and the floor heating pipe, and a second working position that connects the floor heating pipe to the fan coil return pipe (502). And the second working position of blocking the return water pipe (502) of the fan coil unit to the side of the other floor heating pipe; the return water pipe (502) of the fan coil unit is connected to the bypass pipe (503) through the bypass reversing valve (620). The bypass reversing valve (620) has a first working position that connects the bypass pipe (503) and blocks the return water pipe (502) of the fan coil unit and the heat exchange device (3), and a second working position that connects the return water pipe (502) of the fan coil unit and the heat exchange device (3) and blocks the bypass reversing valve (620).

2. The built-in valve fan coil unit for ground heating as described in claim 1, characterized in that: The two floor heating pipes include a floor heating supply pipe (504) and a floor heating return pipe (505) arranged sequentially along the return direction of the fan coil return pipe (502). The fan coil return pipe (502) is connected to the floor heating return pipe (505) through a floor heating three-way valve (610).

3. The built-in valve fan coil unit for ground heating as described in claim 2, characterized in that: The inlet end of the floor heating water supply pipe (504) is equipped with a floor heating water supply control valve (640).

4. The built-in valve fan coil unit for ground heating as described in claim 1, characterized in that: The inlet end of the bypass pipe (503) is equipped with a bypass flow control valve (630).

5. A built-in valve fan coil unit for ground heating as described in claim 1, characterized in that: The floor heating three-way valve (610) and the bypass reversing valve (620) are respectively equipped with electric heating / electric controllers.

6. A built-in valve fan coil unit for ground heating as described in claim 1, characterized in that: The inlet of the fan coil water inlet pipe (501), the outlet of the fan coil return water pipe (502) and the underfloor heating interface of the underfloor heating pipe are connected to the outside of the housing (1), and a drainage mechanism (7) is provided below the valve body receiving cavity (4).

7. A built-in valve fan coil unit for ground heating as described in claim 6, characterized in that: The drainage mechanism (7) includes a water receiving tray (701), and a centralized drainage area (702) is provided at one end of the water receiving tray (701). The centralized drainage area (702) is provided with a gravity drainage outlet (703) that communicates with the outside. The centralized drainage area (702) is provided with a downwardly recessed lift pump suction area (709), and a lift pump (704) that draws water from the lift pump suction area (709) is provided above the water receiving tray (701).

8. A built-in valve fan coil unit for ground heating as described in claim 7, characterized in that: The water receiving tray (701) is symmetrical along the central plane, the axis of the gravity drain outlet (703) coincides with the central plane, and the water receiving tray (701) is symmetrically provided with mounting parts (705) that cooperate with the shell (1) on both sides of the central plane. The water receiving tray (701) is provided with a drainage slope (706) that is high in the middle and low on both sides below the heat exchange device (3). A drainage channel (707) is provided on both sides of the lower part of the drainage slope (706). The drainage channel (707) is connected to the centralized drainage area (702). The heights of the drainage slope (706), the drainage channel (707) and the centralized drainage area (702) decrease in a step-like manner. A level mounting groove (708) is provided on one side of the water receiving tray (701).

Images