Fan coil unit and air conditioning system
By automatically controlling the water pump to drain the cold water in the cold coil pipe in the fan coil device, the problem of traditional fan coil units needing to manually drain the cold coil pipe in winter is solved, and automatic control is achieved, avoiding the risk of cold water freezing and expansion.
Patent Information
- Application Number
- CN202421431207.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-21
AI Technical Summary
Traditional fan coil units need to manually emptiate the cold coil in winter to prevent icing and expansion. They lack automated control and are prone to breaking the cold coil due to user forgetting.
A temperature sensor is used to detect the air temperature blowing towards the cold coil pipe. When the temperature is lower than the preset value, the first and second solenoid valves are automatically opened, the water pump is started, and the cold water in the cold coil pipe is quickly discharged.
It realizes automatic evacuation of cold water in the cold coil pipe without manual monitoring, avoids losses caused by the icy expansion of cold water, and improves the safety and reliability of the system.
Smart Images
Figure CN222718277U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air conditioning, in particular to a fan coil device and an air conditioning system. Background Art
[0002] The fan coil air conditioning system consists of multiple fan coil units and a cold and heat source supply system. The fan coil unit includes a fan, coil and filter. As the terminal device of the air conditioning system, each fan coil unit is installed in each air-conditioned room to process the air independently, and the cold water or hot water required for air treatment is centrally prepared in the air conditioning room and provided to each fan coil unit through the water supply system.
[0003] The fan coil unit uses a fan to continuously circulate the air in the room, allowing it to continuously pass through the coil that supplies cold or hot water, and is continuously cooled or heated to maintain the temperature of the room.
[0004] In traditional fan coil units, there is a drain valve at the bottom and an exhaust valve at the top. In seasons when refrigeration is not needed, such as winter, the cold coil is not used. At this time, the user needs to manually open the exhaust valve and drain valve to drain the cold water inside the cold coil to prevent ice expansion and avoid the cold coil from bursting. However, the mode of manually opening the drain valve is not controllable. When the user forgets to handle it or the weather suddenly cools down, the cold coil will freeze and burst, causing irreparable losses.
[0005] Therefore, there is an urgent need for a fan coil unit device and an air conditioning system to solve the above problems. Utility Model Content
[0006] The utility model aims to provide a fan coil device and an air conditioning system, which utilizes a temperature sensor to detect the temperature of air blown to a cold coil. When the temperature of the air blown to the cold coil is lower than a preset value, a first solenoid valve and a second solenoid valve are both opened, and a water pump is started to discharge the cold water in the cold coil in time.
[0007] To achieve this purpose, the utility model adopts the following technical solutions:
[0008] A fan coil unit, comprising:
[0009] A cold coil, wherein the cold coil is connected to a first water pipe and a second water pipe, the first water pipe is provided with a first solenoid valve and a water pump, the first solenoid valve is used to open or close the first water pipe, the water pump is used to pump out cold water from the first water pipe and the cold coil, and the second water pipe is provided with a second solenoid valve, the second solenoid valve is used to open or close the second water pipe;
[0010] A temperature sensor is arranged on the air receiving side of the cold coil. The temperature sensor is used to detect the temperature of the air blowing toward the cold coil. When the temperature of the air blowing toward the cold coil is lower than a preset value, the first solenoid valve and the second solenoid valve are both opened, and the water pump is started.
[0011] As an optional technical solution, the first water pipe is arranged at the bottom of the cold coil.
[0012] As an optional technical solution, the fan coil device further includes a hot coil, and the hot coil is arranged on a side of the cold coil away from the temperature sensor.
[0013] As an optional technical solution, the fan coil unit further includes a heating element, and the heating element is arranged on the air receiving side of the cold coil.
[0014] As an optional technical solution, the heating element is located between the temperature sensor and the heat coil.
[0015] As an optional technical solution, the first water pipe is provided with a liquid level sensor, and the liquid level sensor is used to detect the liquid level height of the first water pipe.
[0016] As an optional technical solution, the temperature sensor is provided in a plurality, and the plurality of temperature sensors are arranged in a rectangular shape, and the distances from the plurality of temperature sensors to the cold coil are equal.
[0017] An air conditioning system, comprising an air input device and the fan coil device as described above, wherein the temperature sensor is arranged between the air input device and the cold coil.
[0018] As an optional technical solution, the air conditioning system further includes a water supply system, and the water supply system is connected to the cold coil.
[0019] Beneficial effects of the utility model:
[0020] The fan coil device provided by the utility model comprises a cold coil and a temperature sensor, the cold coil is connected with a first water pipe and a second water pipe, the first water pipe is provided with a first solenoid valve and a water pump, the first solenoid valve is used to open or close the first water pipe, the water pump is used to extract cold water from the first water pipe and the cold coil, the second water pipe is provided with a second solenoid valve, the second solenoid valve is used to open or close the second water pipe; the temperature sensor is arranged on the air receiving side of the cold coil, the temperature sensor is used to detect the temperature of the air blowing to the cold coil, when the temperature of the air blowing to the cold coil is lower than the preset value, the first solenoid valve and the second solenoid valve are both opened, and the water pump is started. When the temperature sensor detects that the temperature of the air blowing to the cold coil is lower than the preset value, it indicates that the ambient temperature is lower than the preset value, and it is no longer necessary to refrigerate through the air conditioning system, and at this time, the cold water inside the cold coil should be prevented from freezing, therefore, at this time, the first solenoid valve opens the first water pipe, the second solenoid valve opens the second water pipe, the water pump is started, and the cold water inside the cold coil is quickly extracted to prevent the cold water from freezing and expanding in the cold coil.
[0021] The air conditioning system provided by the utility model comprises the above-mentioned fan coil device, which does not require manual monitoring, thereby avoiding the problem that the cold water of the cold coil cannot be discharged in time due to the user forgetting. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural layout diagram of the air conditioning system of the utility model;
[0023] Figure 2 It is a partial structural layout diagram of the fan coil unit of the utility model.
[0024] In the figure:
[0025] 100. Fan coil unit; 200. Air input device;
[0026] 1. Cold coil; 2. First water pipe; 3. Second water pipe; 4. First solenoid valve; 5. Water pump; 6. Second solenoid valve; 7. Temperature sensor; 8. Liquid level sensor; 9. Hot coil; 10. Heating element. DETAILED DESCRIPTION
[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0031] like Figure 1 and Figure 2 As shown, the present embodiment provides a fan coil device 100, which includes a cold coil 1 and a temperature sensor 7. The cold coil 1 is connected to a first water pipe 2 and a second water pipe 3. The first water pipe 2 is provided with a first solenoid valve 4 and a water pump 5. The first solenoid valve 4 is used to open or close the first water pipe 2. The water pump 5 is used to extract cold water from the first water pipe 2 and the cold coil 1. The second water pipe 3 is provided with a second solenoid valve 6. The second solenoid valve 6 is used to open or close the second water pipe 3. The temperature sensor 7 is arranged on the air receiving side of the cold coil 1. The temperature sensor 7 is used to detect the temperature of the air blown to the cold coil 1. When the temperature of the air blown to the cold coil 1 is lower than a preset value, the first solenoid valve 4 and the second solenoid valve 6 are both opened, and the water pump 5 is started.
[0032] When the temperature sensor 7 detects that the temperature of the air blown to the cold coil 1 is lower than the preset value, it indicates that the ambient temperature is lower than the preset value and cooling by the air conditioning system is no longer needed. At this time, the cold water inside the cold coil 1 should be prevented from freezing. Therefore, the first solenoid valve 4 opens the first water pipe 2, the second solenoid valve 6 opens the second water pipe 3, and the water pump 5 starts to quickly pump out the cold water inside the cold coil 1 to prevent the cold water from freezing and expanding inside the cold coil 1.
[0033] In cold seasons, such as winter, generally speaking, rooms need heating but not cooling, so the hot coil 9 needs to work but not the cold coil 1. However, the installation position of the hot coil 9 is close to the installation position of the cold coil 1. When the fan blows cold air to the hot coil 9, it will also cause the cold coil 1 to cool down. If there is still cold water inside the cold coil 1 at this time, the cold water is likely to freeze and then break the cold coil 1. To solve this problem, the present embodiment first uses the temperature sensor 7 to detect the air temperature blown by the fan to the cold coil 1. When the air temperature is lower than a preset value, such as 5°C, it is necessary to ensure that no cold water is stored inside the cold coil 1. According to the detection data fed back by the temperature sensor 7, the first solenoid valve 4, the second solenoid valve 6 and the water pump 5 are all started to work. The first solenoid valve 4 opens the first water pipe 2, and the second solenoid valve 6 opens the second water pipe 3. Since the first water pipe 2 and the second water pipe 3 are both connected to the cold coil 1, the water pump 5 can quickly discharge the cold water inside the cold coil 1 to prevent the cold water from freezing inside the cold coil 1.
[0034] In this embodiment, the second solenoid valve 6 can open or close the second water pipe 3. When the second solenoid valve 6 opens the second water pipe 3, air can enter the second water pipe 3. Under the condition of atmospheric balance, the water pump 5 can smoothly pump out the cold water inside the cold coil 1.
[0035] Optionally, the first water pipe 2 is disposed at the bottom of the cold coil 1. When the water supply system no longer provides cold water to the cold coil 1, due to gravity, the cold water inside the cold coil 1 always tends to flow to the first water pipe 2, which is beneficial to drainage.
[0036] In this embodiment, the fan coil device 100 further includes a hot coil 9 , which is disposed on a side of the cold coil 1 away from the temperature sensor 7 .
[0037] In some application environments, such as laboratories, the laboratories have certain requirements for temperature and humidity. When the air conditioning system of this embodiment is applied to the laboratory, the air driven by the fan passes through the temperature sensor 7, the cold coil 1 and the hot coil 9 in sequence. When the air passes through the cold coil 1, it is cooled and dehumidified to obtain dry and low-temperature air. When passing through the hot coil 9, the air temperature is increased to a preset value, such as 10°C or 16°C, thereby meeting the laboratory's requirements for air temperature and humidity.
[0038] In some other application environments, the air does not need to be heated again after being cooled by the cold coil 1 , so the cold coil 1 and the hot coil 9 are thermally insulated.
[0039] Optionally, the fan coil unit 100 further includes a heating element 10, which is arranged on the air receiving side of the cold coil 1. The heating element 10 is a PTC heating element, and the air flows fast. In order to ensure that the air temperature can be raised to a preset requirement, the air can be heated first by the heating element 10, and then heated again by the hot coil 9.
[0040] Optionally, the heating element 10 is located between the temperature sensor 7 and the heat coil 9. The air passes through the temperature sensor 7, the heating element 10 and the heat coil 9 in sequence, and the air is first detected by the temperature sensor 7, and then heated by the heating element 10 and the heat coil 9 after obtaining the temperature signal.
[0041] Optionally, the first water pipe 2 is provided with a liquid level sensor 8, which is used to detect the liquid level of the first water pipe 2. When the temperature sensor 7 detects that the ambient temperature drops to 1°C and the liquid level sensor 8 detects that there is still water in the first water pipe 2, the heating element 10 is started to heat the air to 6°C to ensure that the cold water pan or the first water pipe 2 will not be frozen during the drainage process of the water pump 5.
[0042] Optionally, there are multiple temperature sensors 7 , and the multiple temperature sensors 7 are arranged in a rectangular shape, and the distances between the multiple temperature sensors 7 and the cold coil 1 are equal.
[0043] In this embodiment, the number of temperature sensors 7 is set to 9, and the 9 temperature sensors 7 are arranged in 3 rows and 3 columns to accurately detect the air temperature. When the air temperature detected by a certain temperature sensor 7 is lower than the preset value, the first solenoid valve 4, the second solenoid valve 6 and the water pump 5 are immediately controlled to start.
[0044] In this embodiment, the temperature sensor 7 is installed on a mounting bracket, and the mounting bracket can be adjusted along the air flow direction to be arranged on the air receiving side of the cold coil 1. The temperature sensor 7 is driven by the mounting bracket, so that the temperature sensor 7 is close to or away from the cold coil 1.
[0045] This embodiment also provides an air conditioning system, which includes an air input device 200 and the above fan coil device 100, and a temperature sensor 7 is arranged between the air input device 200 and the cold coil 1.
[0046] The air conditioning system provided in this embodiment includes the above-mentioned fan coil device 100, which does not require manual monitoring, thereby avoiding the problem that the cold water in the cold coil 1 cannot be discharged in time due to the user forgetting.
[0047] In this embodiment, the air input device 200 includes a fan, and the fan is used to blow air toward the fan coil device 100 .
[0048] Specifically, the air conditioning system is provided with a central control module, and the central control module is electrically connected to the temperature sensor 7 , the first solenoid valve 4 , the second solenoid valve 6 and the water pump 5 .
[0049] Specifically, the air conditioning system is provided with a water supply system, which is connected to the cold coil 1. The water supply system is also connected to the hot coil 9, and the water supply system can provide cold water to the cold coil 1 and hot water to the hot coil 9. In this embodiment, the water supply function of the water supply system is not affected by the operation of the first solenoid valve 4 and the second solenoid valve 6. In order to avoid waste, generally speaking, when the water supply system supplies cold water to the cold coil 1, the first solenoid valve 4 and the second solenoid valve 6 are both closed to prevent the cold water inside the cold coil 1 from being discharged. When it is necessary to prevent the cold water inside the cold coil 1 from freezing, the first solenoid valve 4 and the second solenoid valve 6 are both opened, and the water supply system stops supplying cold water to the cold coil 1 at this time, so as to avoid wasting cold water on the one hand, and to prevent the cold water from freezing after entering the cold coil 1 on the other hand.
[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A fan coil unit, characterized in that: The fan coil unit (100) comprises: A cold coil (1), the cold coil (1) being connected to a first water pipe (2) and a second water pipe (3), the first water pipe (2) being provided with a first electromagnetic valve (4) and a water pump (5), the first electromagnetic valve (4) being used to open or close the first water pipe (2), the water pump (5) being used to pump out cold water from the first water pipe (2) and the cold coil (1), the second water pipe (3) being provided with a second electromagnetic valve (6), the second electromagnetic valve (6) being used to open or close the second water pipe (3); A temperature sensor (7) is arranged on the air receiving side of the cold coil (1), and the temperature sensor (7) is used to detect the temperature of the air blowing toward the cold coil (1). When the temperature of the air blowing toward the cold coil (1) is lower than a preset value, the first solenoid valve (4) and the second solenoid valve (6) are both opened, and the water pump (5) is started.
2. The fan coil unit according to claim 1, characterized in that: The first water pipe (2) is arranged at the bottom of the cold coil (1).
3. The fan coil unit according to claim 1, characterized in that: The fan coil device (100) further comprises a hot coil (9), wherein the hot coil (9) is arranged on a side of the cold coil (1) facing away from the temperature sensor (7).
4. The fan coil unit according to claim 3, characterized in that: The fan coil unit (100) further comprises a heating element (10), wherein the heating element (10) is arranged on the air receiving side of the cold coil (1).
5. The fan coil unit according to claim 4, characterized in that: The heating element (10) is located between the temperature sensor (7) and the heat coil (9).
6. The fan coil unit according to claim 5, characterized in that: The first water pipe (2) is provided with a liquid level sensor (8), and the liquid level sensor (8) is used to detect the liquid level height of the first water pipe (2).
7. The fan coil unit according to claim 1, characterized in that: The temperature sensors (7) are provided in a plurality, and the plurality of temperature sensors (7) are arranged in a rectangular array, and the distances between the plurality of temperature sensors (7) and the cold coil (1) are all equal.
8. An air conditioning system, characterized in that The air conditioning system comprises an air input device (200) and a fan coil device (100) according to any one of claims 1 to 7, and the temperature sensor (7) is arranged between the air input device (200) and the cold coil (1).
9. The air conditioning system according to claim 8, characterized in that: The air conditioning system also includes a water supply system, which is connected to the cold coil (1).