A fan coil and air conditioning system

Abstract

The utility model provides a fan -coil and air conditioning system, including base, be provided with a plurality of centrifugal fan, a motor and heat exchanger on the base, all coaxial arrangement of centrifugal fan, all centrifugal fan's export all lead to heat exchanger, form the air intake interval of different width between two adjacent centrifugal fan, be provided with fixed position in the air intake interval of maximum width, motor setting is on fixed position, motor can drive all centrifugal fan rotates, with can realize the purpose of reducing the overall energy consumption of air disc under the condition of guaranteeing the air intake of centrifugal fan.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to a fan coil unit and an air conditioning system. Background Technology

[0002] In commercial air conditioning systems, terminal fan coil units typically use multiple motors to drive multiple centrifugal fans to achieve air circulation and heat exchange. One motor is positioned between two adjacent centrifugal fans, with the motor's shaft coaxial with the fan's axis of rotation. Since the air inlets of the centrifugal fans are located on either side of their own axis of rotation, the motor's placement occupies valuable air intake space, negatively impacting airflow into the centrifugal fans and reducing intake efficiency. Increasing the motor's power to ensure sufficient airflow into the centrifugal fans would increase the overall power consumption of the fan coil unit.

[0003] How to reduce the overall energy consumption of the fan coil unit while ensuring the air intake of the centrifugal fan is a technical problem that urgently needs to be solved. Utility Model Content

[0004] Therefore, this utility model provides a fan coil unit and air conditioning system that can reduce the overall energy consumption of the fan coil unit while ensuring the air intake of the centrifugal fan.

[0005] On one hand, this utility model provides a fan coil unit, including a base, on which multiple centrifugal fans, a motor and a heat exchanger are arranged. All the centrifugal fans are coaxially arranged, and the outlets of all the centrifugal fans lead to the heat exchanger. Adjacent centrifugal fans are separated by air intake gaps of different widths. A fixed position is provided in the air intake gap with the largest width, and the motor is located in the fixed position. The motor can drive all the centrifugal fans to rotate.

[0006] In some embodiments, the number of centrifugal fans is three, and the three centrifugal fans are, in order, a first fan, a second fan, and a third fan; there is a first air intake interval between the first fan and the second fan, and a second air intake interval between the second fan and the third fan; the width of the first air intake interval is greater than the width of the second air intake interval, and the motor is located in the middle of the first air intake interval.

[0007] In some embodiments, the width of the first air intake interval (501) is L1, and the width of the second air intake interval (502) is L2, where 1.7L2≤L1≤1.9L2.

[0008] In some embodiments, the base has a length L in the axial direction of the centrifugal fan, and the two ends of the base are a first end and a second end, respectively. The distance between the first fan and the first end of the base is L3, and the distance between the third fan and the second end of the base is L4. The length of the centrifugal fan is...

[0009] In some embodiments, a bracket is provided between the third fan and the second end, and one end of the shaft of the third fan is rotatably mounted on the bracket, where L4 = 1.1L3.

[0010] In some embodiments, the axial length of the motor housing is F, the distance between the motor housing and the first fan is E1, the distance between the motor housing and the second fan is E2, the housing is disposed in the middle of the first air intake interval, and E1 + E2 ≥ F.

[0011] In some embodiments, both ends of the motor shaft extend out of the motor housing. The first end of the shaft drives the first fan to work, and the second end of the shaft is connected to a drive shaft via a coupling. The drive shaft drives both the first fan and the second fan to work simultaneously.

[0012] In some embodiments, the coupling is an elastic coupling, which includes a first rigid part and a second rigid part, the first rigid part and the second rigid part being connected together via the elastic part; the second end of the rotating shaft is connected to the first rigid part, one end of the transmission shaft is connected to the second rigid part, and when a bracket is provided, the other end of the transmission shaft is rotatably connected to the bracket.

[0013] In some embodiments, the first rigid portion is provided with a first hole, the second rigid portion is provided with a second hole, the first rigid portion and the second rigid portion are spaced apart, the first hole and the second hole are coaxial, and the elastic portion wraps around the first rigid portion and the second rigid portion.

[0014] On the other hand, this utility model also provides an air conditioning system, including the aforementioned fan coil unit.

[0015] This invention effectively optimizes the distribution of centrifugal fans and motors by reducing the number of motors and adjusting the air intake interval between two adjacent centrifugal fans, and placing the motors in the widest air intake interval. This ensures the air volume delivered by the fan coil unit while effectively reducing energy consumption. Since the airflow through each air intake interval is basically the same, the air delivery by the fan coil unit is more uniform and the air delivery efficiency is improved. The required air volume can be achieved without increasing the overall size of the fan coil unit, which helps to maintain the compactness of the fan coil unit. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a first-view schematic diagram of the fan coil unit structure according to an embodiment of the present utility model;

[0018] Figure 2 This is a second-view schematic diagram of the fan coil unit structure according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the centrifugal fan structure according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the motor and the transmission shaft connected together via a coupling according to an embodiment of this utility model;

[0021] Figure 5 This is a radial sectional view of the coupling according to an embodiment of the present invention;

[0022] Figure 6 This is an airflow cloud diagram of the existing technology when three centrifugal fans are set with one motor, the motor speed is 960 r / min, and the distance between two adjacent centrifugal fans is the same.

[0023] Figure 7 This is an airflow cloud diagram of the existing technology when three centrifugal fans are set with one motor, the motor speed is 1200 r / min, and the distance between two adjacent centrifugal fans is the same.

[0024] Figure 8 This is an airflow cloud diagram of an embodiment of the present invention with a motor speed of 960 r / min, different spacing between two adjacent centrifugal fans, and one motor set in the air intake interval with the largest spacing.

[0025] Figure 9This is an airflow cloud diagram of an embodiment of the present invention with a motor speed of 1200 r / min, different spacing between two adjacent centrifugal fans, and one motor set in the air inlet interval with the largest spacing.

[0026] Figure 10 This is a comparison chart of the air delivery volume of the fan coil unit of this utility model embodiment and the fan coil unit of the prior art at the same motor speed;

[0027] Figure 11 This is a diagram showing the motor distribution of existing fan coil units;

[0028] Figure 12 This is a diagram showing the motor distribution of the fan coil unit of this utility model;

[0029] Figure 13 This is a schematic diagram of a fan coil unit based on existing technology.

[0030] The attached figures are labeled as follows:

[0031] 1. Motor; 2. Fan coil; 201. Base; 202. Heat exchanger; 301. Drive shaft; 3011. Keyway; 4. Volute; 401. First fan; 402. Second fan; 403. Third fan; 404. Blade; 501. First air intake gap; 502. Second air intake gap; 6. Coupling; 601. First rigid part; 602. Second rigid part; 603. Elastic part; 6011. First hole; 6021. Second hole; 7. Bracket; 8. Fan blade nesting. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0036] In commercial air conditioning systems, terminal fan coil units typically employ a multi-motor driven, multi-fan structure to achieve air circulation and heat exchange. This traditional structure presents several problems: First, the use of multiple motors increases system energy consumption and manufacturing costs. Second, the motors are usually positioned between or in the center of the fans, occupying valuable intake space and restricting airflow between fans, thus affecting intake efficiency. Furthermore, due to motor obstruction, the spacing between fans must be relatively large to avoid performance loss, resulting in an increased overall fan coil unit size, which is unfavorable in compact installation environments. In addition, existing fan coil unit structures lack design considerations for key parameters such as fan spacing and motor layout, leading to uneven airflow and low efficiency. Therefore, how to reduce energy consumption, increase airflow, and improve airflow uniformity within limited space has become a pressing technical problem to be solved in the design of current commercial air conditioning fan coil unit structures.

[0037] See also Figure 1-5 As shown, the present invention proposes a fan coil unit, including a base 201, on which multiple centrifugal fans, a motor 1, and a heat exchanger 202 are mounted. All the centrifugal fans are coaxially arranged, and the outlets of all the centrifugal fans lead to the heat exchanger 202. Adjacent centrifugal fans are separated by air intake gaps of different widths. A fixed position is provided in the air intake gap with the largest width, and the motor 1 is mounted in the fixed position. The motor 1 can drive all the centrifugal fans to rotate.

[0038] Compared to existing technologies (such as...) Figure 11 (As shown) Motor 1 is installed between two adjacent centrifugal fans. This application only installs one, as shown. Figure 12 This design reduces the obstruction of the centrifugal fan inlet by motor 1; simultaneously, adjusting the distance between adjacent centrifugal fans maximizes the width of the air intake interval for motor 1, making it wider than other air intake intervals, effectively reducing the obstruction of air intake by motor 1. Without altering the existing fan coil unit's external dimensions, it improves air intake efficiency. Combined with increasing the power of a single motor 1, it ensures the overall exhaust volume of the fan coil unit. Due to the optimized air intake layout, the resistance of a single motor 1 to airflow is reduced. Compared to existing technologies, while maintaining a essentially unchanged exhaust volume, the optimized fan coil unit of this application reduces overall power consumption, saving energy. Compared to simply increasing the spacing between centrifugal fans without optimizing the motor 1 setup, which results in a larger overall fan coil unit size, this application, by adjusting the spacing between centrifugal fans and the number of motors 1, achieves a more compact overall structure for the fan coil unit, making it suitable for smaller spaces. Using a single motor 1 not only reduces energy consumption but also lowers manufacturing costs and assembly time. Unless otherwise specified, the term "width" in this application refers to the "dimension" in the axial direction of the rotating shaft of motor 1.

[0039] Furthermore, motor 1 is a variable frequency motor.

[0040] Preferred, such as Figure 1 and Figure 2 As shown, there are three centrifugal fans, which are sequentially designated as a first fan 401, a second fan 402, and a third fan 403. The first fan 401 and the second fan 402 are connected by a first air intake interval 501, and the second fan 402 and the third fan 403 are connected by a second air intake interval 502. The width of the first air intake interval 501 is greater than the width of the second air intake interval 502. The motor 1 is positioned in the middle of the first air intake interval 501.

[0041] The base 201 of this application is equipped with three centrifugal fans, forming a layout of centrifugal fans, motor 1, centrifugal fans, and centrifugal fans. An air intake interval is formed between two adjacent centrifugal fans. The width of the first air intake interval 501 (the axial width of the rotation axis of the centrifugal fan) is greater than the width of the second air intake interval 502 (in the prior art, the spacing between two adjacent centrifugal fans is the same). The motor 1 is set in the first air intake interval 501 (in the prior art, each air intake interval is equipped with a motor, but this application eliminates the motor in the second air intake interval 502) and is located in the middle position of the first air intake interval 501. In this way, the obstruction of the motor 1 to the air entering the first air intake interval 501 is effectively reduced, which is conducive to improving the exhaust efficiency of the fan coil unit of the single motor 1 and three fans.

[0042] Preferred, such as Figure 1 and Figure 2 As shown, the width of the first air intake interval 501 is L1, and the width of the second air intake interval 502 is L2, where 1.7L2≤L1≤1.9L2.

[0043] By ensuring that 1.7L2≤L1≤1.9L2, the airflow entering the first air intake interval 501 and the second air intake interval 502 can be effectively balanced, which effectively improves the overall air intake and exhaust volume of the fan coil unit, as well as the uniformity of air delivery by the multiple centrifugal fans of the fan coil unit, and improves the air delivery efficiency.

[0044] Preferred, such as Figure 1 and Figure 2 As shown, the base 201 has a length of L in the axial direction of the centrifugal fan. In the axial direction, the two ends of the base 201 are a first end and a second end, respectively. The distance between the first fan 401 and the first end of the base 201 is L3, and the distance between the third fan 403 and the second end of the base 201 is L4. The length of the centrifugal fan is D.

[0045] ,

[0046] like Figure 2 and Figure 9 As shown, this application is approved. The spacing between centrifugal fans was optimized, and the distance between motor 1 and the centrifugal fans was also optimized, effectively increasing the air intake and exhaust volume. Specifically, through... This design allows the fan coil unit to be installed in indoor spaces where there are obstacles at both ends. On one hand, it avoids the adverse effects of outdoor weather changes on the fan coil unit; on the other hand, the centrifugal fan is a certain distance from both ends of the base 201, minimizing the impact on air intake even with obstacles at the ends of the base 201, thus improving the applicable environment for the fan coil unit. The centrifugal fan on the base 201 is a certain distance (L3 and L4) from both ends of the base 201, ensuring good air intake even with walls or other objects at the ends of the base 201, which helps maintain the overall airflow of the fan coil unit. Figure 12 As shown, for example: when the total length of the fan coil unit L=1250mm and D=211mm, L1=240mm, L2=140mm, L3=118mm, L4=118mm.

[0047] Preferred, such as Figure 1 and Figure 2 As shown, a bracket 7 is provided between the third fan 403 and the second end, and one end of the shaft of the third fan 403 is rotatably mounted on the bracket 7, with L4=1.1L3.

[0048] Because of the bracket 7, by making L4=1.1L3, the impact of the bracket 7 on the air intake is effectively reduced, which is conducive to improving the air intake and air output of the fan coil unit.

[0049] Furthermore, the bracket 7 is positioned near the edge of the second end of the chassis.

[0050] Preferred, such as Figure 1 and Figure 2 As shown, the axial length of the housing of the motor 1 is F, the distance between the housing of the motor 1 and the first fan 401 is E1, the distance between the housing of the motor 1 and the second fan 402 is E2, the housing is located in the middle of the first air intake interval 501, and E1 + E2 ≥ F.

[0051] The housing is located in the middle of the first air intake interval 501, so that the air intake volume of the first fan 401 and the second fan 402 from the first air intake interval 501 is basically balanced. By E1 + E2 ≥ F, the obstruction of the motor 1 (the housing of the motor 1) to the air intake is further reduced, thereby reducing the adverse effect of the motor 1 on the air volume entering the centrifugal fan.

[0052] Preferred, such as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, both ends of the rotating shaft of the motor 1 extend out of the housing of the motor 1. The first end of the rotating shaft drives the first fan 401 to work, and the second end of the rotating shaft is connected to the transmission shaft 301 via the coupling 6. The transmission shaft 301 drives both the first fan 401 and the second fan 402 to work.

[0053] When the motor 1's shaft extends out of the motor 1's housing at both ends, it forms a dual-output structure. The first end of the shaft directly drives the first fan 401, and the second end of the shaft drives the second fan 402 and the third fan 403 to operate synchronously via the transmission shaft 301. This makes the overall structure relatively simple, and the transmission shaft 301 has little impact on the airflow, which is beneficial to improving the air intake of the fan coil unit.

[0054] Preferred, such as Figure 4 and Figure 5 As shown, the coupling 6 is an elastic coupling 6, which includes a first rigid part 601 and a second rigid part 602. The first rigid part 601 and the second rigid part 602 are connected together via an elastic part 603. The second end of the rotating shaft is connected to the first rigid part 601, and one end of the transmission shaft 301 is connected to the second rigid part 602. When a bracket 7 is provided, the other end of the transmission shaft 301 is rotatably connected to the bracket 7.

[0055] By including a first rigid part 601, a second rigid part 602, and an elastic part 603 connecting the two rigid parts, and having the two rigid parts directly connected to the rotating shaft and transmission shaft 301 of the motor 1, the transmission of vibration can be reduced, which is beneficial to reducing the vibration and noise of the fan coil unit during operation.

[0056] Preferred, such as Figure 4 and Figure 5 As shown, the first rigid part 601 is provided with a first hole 6011, the second rigid part 602 is provided with a second hole 6021, the first rigid part 601 and the second rigid part 602 are spaced apart, the first hole 6011 and the second hole 6021 are coaxial, and the elastic part 603 wraps around the first rigid part 601 and the second rigid part 602.

[0057] Specifically, the second end of the motor 1's shaft is inserted into the first hole 6011 and fixed with screws, and one end of the drive shaft 301 is inserted into the second hole 6021 and fixed with screws. The elastic part 603 effectively absorbs and weakens the vibration of the motor 1's shaft, effectively reducing the adverse effects of the motor 1's operation on the centrifugal fan. Similarly, the vibration generated by the airflow during the centrifugal fan's operation can also be absorbed and weakened by the elastic part 603, reducing the impact of airflow fluctuations on the motor 1 and lowering the vibration and noise of the fan coil unit. Ultimately, this improves the stability and service life of the fan coil unit.

[0058] Furthermore, such as Figure 3 As shown, the centrifugal fan is housed within the volute 4. The centrifugal fan also includes a fan blade nest 8 (on the hub for inserting the drive shaft) and blades 404. Specifically, the first end of the motor 1's shaft is inserted into the fan blade nest 8 of the first fan 401, and the drive shaft 301 is sequentially inserted into the fan blade nests 8 of the second fan 402 and the third fan 403. Furthermore, the drive shaft 301 has two keyways 3011, which are opposite to the fan blade nest 8. By setting a key within the keyway 3011, the key connects to the fan blade nest 8 via the keyway 3011, thus creating an anti-rotation connection between the drive shaft 301 and the centrifugal fan.

[0059] Furthermore, the elastic part 603 is a composite material.

[0060] Through CFD simulation, such as Figures 6-9 As shown in the figure, it can be clearly concluded that ( Figure 8 and Figure 9 When each fan coil unit is equipped with a single motor, the air inlet spacing (air inlet duct) layout of this application is more reasonable, with a smaller low-speed area and more consistent air velocity, effectively improving the uniformity of air supply and maximizing the air volume supplied, thereby improving the heat exchange efficiency of the fan coil unit; specifically, such as Figure 10 As shown, when the speed of motor 1 is 960 r / min, the air volume of the fan coil unit of this application is increased by 3.8% compared with the air volume of the fan coil unit of the prior art, and the air delivery is more uniform; when the speed of motor 1 is 1200 r / min, the air volume of the fan coil unit of this application is increased by 2.8% compared with the air volume of the fan coil unit of the prior art, and the air delivery is more uniform.

[0061] Calculations show that, under the same air volume, the power consumption of the fan coil unit in this application is reduced by approximately 30W, and the number of motors 1 is also reduced. This not only reduces operating energy consumption but also manufacturing costs. Since only one motor 1 is set, the overall structure of the fan coil unit is also simplified, which helps to reduce the total life cycle cost of the fan coil unit.

[0062] This application also provides an air conditioning system, including the aforementioned fan coil unit.

[0063] The fan coil unit includes a fan coil 2, which is a cylindrical shell. A heat exchanger 202 is installed inside the fan coil 2. The heat exchanger 202 includes a heat exchange plate. The extension direction of the heat exchange plate is consistent with the air outlet direction of the centrifugal fan, ensuring that the air blown out by the centrifugal fan can flow fully through the heat exchange plate (that is, the surface of the heat exchanger 202), thereby improving the heat exchange efficiency and accelerating the heat exchange of indoor air.

[0064] One side wall of the fan plate 2 forms the base 201.

[0065] The air conditioning system using the aforementioned fan coil units reduces energy efficiency and improves user comfort.

[0066] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A fan-coil comprising a base (201) provided with a plurality of centrifugal fans, a motor (1) and a heat exchanger (202), all the centrifugal fans being coaxially arranged, all the centrifugal fans having their outlets leading to the heat exchanger (202), characterized in that, Two adjacent centrifugal fans are separated by air intake gaps of different widths. A fixed position is provided in the air intake gap with the largest width, and the motor (1) is located in the fixed position. The motor (1) can drive all the centrifugal fans to rotate.

2. The fan-coil of claim 1, wherein, The number of centrifugal fans is three, namely, the first fan (401), the second fan (402) and the third fan (403); the first fan (401) and the second fan (402) are connected by a first air intake interval (501), and the second fan (402) and the third fan (403) are connected by a second air intake interval (502). The width of the first air intake interval (501) is greater than the width of the second air intake interval (502). The motor (1) is located in the middle of the first air intake interval (501).

3. The fan-coil of claim 2, wherein, The width of the first intake interval (501) is L1, and the width of the second intake interval (502) is L2, where 1.7L2≤L1≤1.9L2.

4. The fan coil of claim 3, wherein, The base (201) has a length of L in the axial direction of the centrifugal fan. In the axial direction, the two ends of the base (201) are a first end and a second end, respectively. The distance between the first fan (401) and the first end of the base (201) is L3, and the distance between the third fan (403) and the second end of the base (201) is L4. The length of the centrifugal fan is D.

5. The fan coil of claim 4, wherein, A bracket (7) is provided between the third fan (403) and the second end. One end of the shaft of the third fan (403) is rotatably mounted on the bracket (7), and L4 = 1.1L3.

6. The fan coil of claim 4, wherein, The axial length of the housing of the motor (1) is F, the distance between the housing of the motor (1) and the first fan (401) is E1, the distance between the housing of the motor (1) and the second fan (402) is E2, the housing is located in the middle of the first air intake interval (501), and E1 + E2 ≥ F.

7. The fan-coil of any one of claims 1-6, wherein, When a first fan (401) and a second fan (402) are provided, both ends of the rotating shaft of the motor (1) extend out of the housing of the motor (1). The first end of the rotating shaft drives the first fan (401) to work, and the second end of the rotating shaft is connected to a transmission shaft (301) via a coupling (6). The transmission shaft (301) drives both the first fan (401) and the second fan (402) to work simultaneously.

8. The fan coil of claim 7, wherein, The coupling (6) is an elastic coupling (6), which includes a first rigid part (601) and a second rigid part (602). The first rigid part (601) and the second rigid part (602) are connected together via an elastic part (603). The second end of the rotating shaft is connected to the first rigid part (601), and one end of the transmission shaft (301) is connected to the second rigid part (602). When a bracket (7) is provided, the other end of the transmission shaft (301) is rotatably connected to the bracket (7).

9. The fan coil of claim 8, wherein, The first rigid part (601) is provided with a first hole (6011), and the second rigid part (602) is provided with a second hole (6021). The first rigid part (601) and the second rigid part (602) are spaced apart, and the first hole (6011) and the second hole (6021) are coaxial. The elastic part (603) wraps around the first rigid part (601) and the second rigid part (602).

10. An air conditioning system comprising the fan coil of any one of claims 1-9.

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