CN106839086B - A fan coil unit - Google Patents

Abstract

The invention relates to a fan coil unit, which includes a fan and a coil. The coil includes a shell and a heat exchanger located in the shell. The shell and the front end plate are provided with an air inlet, and the rear end plate is provided with an air outlet. , the air inlet is close to the upper edge of the front end plate, the air outlet of the fan is in contact with the air inlet of the shell, the distance between the windward side of the heat exchanger and the front end plate is greater than the distance between the leeward side and the rear end plate, and the bottom plate The angle between the front bevel and the plane is greater than the angle between the back bevel and the plane. The structural design of the heat exchanger and the bottom plate of the present invention makes the air flow flow more smoothly after entering the shell from the air inlet, fully diffuse, and reach the heat exchanger smoothly and evenly after the wind speed is reduced, thus avoiding fin noise and resonance of the heat exchanger generation, reducing the noise value. Moreover, the airflow of the present invention reaches the heat exchanger uniformly after being fully diffused, and the heat exchange effect of the heat exchanger is greatly improved, and the heat exchange effect is increased by about 10%.

Description

A fan coil unit

technical field

The invention relates to the technical field of air temperature adjustment, in particular to a fan coil unit applied to an air conditioning system.

Background technique

The terminal equipment of the central air-conditioning system - fan coil unit is an air-conditioning device that assembles a fan and a heat exchange coil. It is currently widely used in shopping malls, hospitals, office buildings, hotels and other places. With the continuous improvement of people's living standards, especially in hotels and other places with high requirements for noise and abnormal sound, the reduction of noise and the elimination of abnormal sound are particularly important.

The structure of the existing fan coil unit is shown in Figure 1 and Figure 2, including a fan 1 and a coil, the coil includes a housing and a heat exchanger 2 located in the housing, and a front end plate 31 of the housing opposite to the fan 1 is provided There is an air inlet, and an air outlet is opened on the rear end plate 32 of the housing opposite to the front end plate 31 , and the distance from the heat exchanger 2 to the front end plate 31 and the rear end plate 32 is the same. The bottom plate 33 of the housing includes a front slope, a plane and a rear slope connected in sequence. The angle between the front slope and the plane is the same as the angle between the rear slope and the plane. The projected area in the planar direction is the same.

As shown in Figure 1, the airflow generated by the fan enters the shell from the air inlet and blows horizontally to the heat exchanger 2, and the airflow is concentrated in the upper 1/2 of the unit, and the lower part of the unit has only a small diffused airflow, resulting in consequences as follows:

(1) Due to the high wind speed of the upper airflow, the fin spacing of the heat exchanger is only 1.4~1.7mm, and there are slots on the fins. After the airflow blows to the heat exchanger, it will produce a whistling effect, resulting in high noise and fins The sound, and the fins of the heat exchanger tend to resonate with the shell, resulting in loud noise.

(2) Since the air flow is only concentrated in the upper part, the heat exchange effect of the upper part of the heat exchanger is better through the heat exchange between the wind and the chilled water, and the air flow in the lower part has only a small diffused air flow, which cannot fully exchange the heat and cold of the heat exchanger Therefore, the heat exchange effect is greatly reduced, resulting in poor heat exchange effect of the entire heat exchanger.

As shown in Figure 2, the heat exchanger is installed at the center of the unit, the distance d from the fan outlet to the heat exchanger is short, and the airflow cannot be fully diffused, resulting in the following consequences:

(1) The airflow has reached the heat exchanger without sufficient diffusion, so the airflow velocity is high, the fin spacing of the heat exchanger is only 1.4~1.7mm, and there are slots on the fins, the airflow blows to the heat exchanger and produces whistling effect, resulting in high noise and a finned sound.

(2) The air flow has reached the heat exchanger without sufficient diffusion. The middle distance e of the heat exchanger is not blown by the wind, and the heat and cold of the heat exchanger cannot be fully exchanged, so the heat exchange effect is greatly reduced, resulting in the failure of the entire heat exchanger. The heat exchange effect is poor.

The angle between the front slope and the plane of the bottom plate is the same as that between the rear slope and the plane, and the angle is relatively steep, which causes the airflow at the bottom of the unit to enter the heat exchanger at an angle that is too large, the airflow resistance is large, and the airflow direction changes suddenly, resulting in abnormal sound and increased noise. big.

Therefore, how to reduce the noise of the wind disk and eliminate the sound of the fins is a technical problem that needs to be solved.

Contents of the invention

The purpose of the present invention is to provide a fan coil unit, which solves the technical problems of high noise and poor heat exchange effect of the existing fan coil unit.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to achieve:

A fan coil unit, including a fan and a coil, the coil includes a casing and a heat exchanger located in the casing, an air inlet is opened on the front end plate of the casing opposite to the fan, and the casing and the The rear end plate opposite to the front plate is provided with an air outlet, the air inlet is close to the upper edge of the front plate, the air outlet of the fan is connected to the air inlet of the housing, and the heat exchange The distance between the windward side of the heat exchanger and the front end plate is L1, the distance between the leeward side of the heat exchanger and the rear end plate is L2, L1>L2; The front slope, the plane and the rear slope are connected, the front slope is connected to the front end plate, the rear slope is connected to the rear end plate, and the angle between the front slope and the plane is larger than the rear slope Angle with the plane.

The above-mentioned fan coil unit is characterized in that 1.5≤L1/L2≤2.5; the projection ratio of the front slope, the plane, and the rear slope in the plane direction is between 10:9:3-12:9:5 between.

As for the above fan coil unit, the angle between the front slope and the plane is between 150°-170°.

In the above-mentioned fan coil unit, the ratio of the height of the air inlet to the height of the front end plate is between 3/5-4/5; the air inlet area of the air inlet and the windward surface of the heat exchanger The area ratio is between 1/4-1/3.

In the above-mentioned fan coil unit, the number of the air inlets is the same as the number of the fans, and when there are multiple air inlets, the ratio of the distance between adjacent air inlets to the width of the air inlets is Between 1/2-3/4.

According to the above-mentioned fan coil unit assembly, a deflector is arranged inside the housing, and the deflector is fixed on the inner surface above the air inlet of the front plate.

In the above-mentioned fan coil unit assembly, the guide vane includes a connected planar guide part and an inclined guide part, and the planar guide part is fixed on the inner surface above the air inlet of the front plate, so The slope guide part is inclined toward the bottom plate.

The above-mentioned fan coil unit is characterized in that the angle between the plane guide part and the slope guide part is between 120°-170°.

The above-mentioned fan coil unit is characterized in that the area ratio of the projection of the slope guide portion in the direction of the air inlet to the area of the air inlet is between 1/12-1/10.

According to the above-mentioned fan coil unit, the ratio of the maximum distance between the guide vane and the front end plate to the distance between the heat exchanger and the front end plate is between 1/8-1/6 .

Compared with the prior art, the advantages and positive effects of the present invention are: the distance between the windward side and the front end plate of the heat exchanger of the present invention is greater than the distance between the leeward side and the rear end plate, and the structural design of the bottom plate is coordinated to ensure that the airflow After entering the shell from the air inlet, the flow is smoother, and it can be fully diffused and evenly reach the heat exchanger. The generation of fin sound and resonance reduces the noise value. Moreover, after the air flow is fully diffused and uniformly reaches the heat exchanger, the heat exchange effect of the heat exchanger is greatly improved, and the heat exchange effect is increased by about 10%.

Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic structural diagram of a fan coil unit in the background art.

Fig. 2 is a top view of a fan coil unit in the background art.

Fig. 3 is a schematic structural diagram of a fan coil unit according to a specific embodiment of the present invention.

Fig. 4 is a top view of a fan coil unit according to a specific embodiment of the present invention

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 3 and 4, this embodiment proposes a fan coil unit, including a fan 1 and a coil. The coil includes a shell 3 and a heat exchanger 2 inside the shell 3 .

The housing 3 is a cuboid, including a front end plate 31, a rear end plate 32, a bottom plate 33, a top plate and left and right side plates. The fan 1 is opposite to the front end plate of the casing 3 .

The front end plate 31 of the housing 3 is provided with an air inlet 311, the air outlet of the fan 1 is adapted to the air inlet 311 of the front end plate 31, the air outlet of the fan 1 is connected with the air inlet 311 of the housing 3, and the fan 1 generates The air flow enters the housing through the air inlet 311 and exchanges heat with the heat exchanger 2 when reaching the heat exchanger 2 . Wherein, the air inlet 311 is close to the upper edge of the front panel 31 .

An air outlet 321 is opened on the rear end plate 32 of the casing 3 opposite to the front end plate 31 , and the air flow that exchanges heat with the heat exchanger 2 is blown out from the air outlet 321 to achieve the effect of changing the ambient temperature.

The heat exchanger 2 is located in the shell 3, parallel to the front end plate 31 and the rear end plate 32 of the shell 3, the distance between the windward side of the heat exchanger 2 and the front end plate 31 is L1, and the leeward side of the heat exchanger 2 The distance from the rear end plate 32 is L2, L1>L2. Preferably, 1.5≤L1/L2≤2.5. The position design of the heat exchanger 2 can improve the smoothness and uniformity of the airflow after entering the shell, so that the airflow can reach the heat exchanger evenly, and after fully exchanging heat with the heat exchanger, it can quickly flow out from the air outlet. Since the wind speed of the airflow passing through the heat exchanger is reduced, the airflow passes through the heat exchanger smoothly, which can avoid the generation of fin noise of the heat exchanger and improve the heat exchange efficiency. At the same time, due to the design of the position of the heat exchanger, the heat exchanger will not resonate with the shell, so the noise generated by the resonance between the fins of the heat exchanger and the shell can also be avoided.

The bottom plate 33 of the housing 3 includes a front slope 331, a plane 332 and a rear slope 333 which are successively connected. The angle between them is greater than the angle between the rear bevel 333 and the plane 332 . Preferably, the angle between the front slope 331 and the plane 332 is between 150°-170°. The projection ratio of the front slope 331 , the plane 332 and the rear slope 333 in the direction of the plane 332 is between 10:9:3-12:9:5. The angle between the front slope 331 of the bottom plate 33 and the plane 332 is greater than the angle between the rear slope 333 and the plane 332, so that the angle at which the airflow at the bottom of the housing 3 enters the heat exchanger 2 becomes smaller, and the angle of the front slope 331 and the airflow direction reach Consistent, thereby eliminating fin ping and reducing noise values. The angle between the rear inclined surface 333 and the plane 332 is reduced, and the air flow passes through the heat exchanger 2 and reaches the air outlet along the rear inclined surface 333, which can increase the air outlet speed and improve the heat exchange efficiency.

The heat exchanger 2 is located above the plane 332. Due to the location design of the heat exchanger 2 and the structural design of the bottom plate, after the airflow generated by the fan 1 enters the housing 3 from the air inlet 311, the airflow can be smooth along the front slope 331 of the bottom plate 3 The ground flows to the heat exchanger 2, the air flow can be fully diffused and evenly reaches the heat exchanger 2, the air velocity of the air flow passing through the heat exchanger 2 is reduced, which can avoid the generation of fin sound and resonance of the heat exchanger 2, and reduce the noise value.

In order to further reduce the noise, the present embodiment designs the position and size of the air inlet, the ratio of the height of the air inlet 311 to the height of the front plate 31 is between 3/5-4/5; The area ratio of the windward side of the heater 2 is between 1/4-1/3. The design of the position and size of the air inlet 311 cooperates with the heat exchanger 2 and the bottom plate 33, so that the airflow can be evenly distributed to the windward side of the entire heat exchanger 2, reducing noise and improving the heat exchange effect of the heat exchanger 2 .

The number of air inlets 311 is the same as the number of fans 1 and corresponds one to one. There are two fans 2 in this embodiment, and there are also two air inlets on the front plate 31 . The ratio of the distance between the two air inlets 311 to the width of the air inlets 311 is between 1/2-3/4. It can not only avoid the abnormal sound caused by the mutual interference of the air intake when the two fans 2 are running, but also improve the air supply efficiency of the fans.

A deflector 4 is arranged inside the casing 3 , and the deflector 4 is fixed on the inner surface above the air inlet 311 of the front plate 31 . The deflector 4 makes the airflow running curve more reasonable, which conforms to the Archimedes spiral of the fan 1, so that the wind speed reaching the heat exchanger 2 is reduced, and the air supply is more uniform, thereby eliminating the fin noise.

The deflector 4 comprises a plane deflector 41 and an inclined plane deflector 42 which are connected, the plane deflector 41 is fixed on the inner surface above the air inlet 311 of the front end plate 31, and the inclined deflector 42 is inclined toward the direction of the bottom plate 33 .

The included angle between the plane guide part 41 and the inclined guide part 42 is between 120°-170°.

The ratio of the area ratio of the projection of the slope guide part 42 in the direction of the air inlet 311 to the area of the air inlet 311 is between 1/12-1/10; The distance ratio between the front-end boards is between 1/8-1/6. The structural design of the deflector 2 can further guide the airflow of the fan 1, and the airflow can smoothly flow to the heat exchanger 2 along the front slope 331 of the deflector 2 and the bottom plate 3, and the airflow can be fully diffused and evenly Reaching the heat exchanger 2, the wind speed of the airflow passing through the heat exchanger 2 is reduced, which can avoid the fin sound and resonance of the heat exchanger 2, reduce the noise value, and at the same time make the air flow evenly distributed to the windward side of the entire heat exchanger 2 On the other hand, while reducing noise, the heat exchange effect of the heat exchanger 2 is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (9)

1. A fan-coil unit comprises a fan and a coil, wherein the coil comprises a shell and a heat exchanger positioned in the shell, an air inlet is formed in a front end plate of the shell, which is opposite to the fan, an air outlet is formed in a rear end plate of the shell, which is opposite to the front end plate, the air inlet is close to the upper side edge of the front end plate, and the air outlet of the fan is butted with the air inlet of the shell, and the fan-coil unit is characterized in that the distance between the windward side of the heat exchanger and the front end plate is L1, the distance between the leeward side of the heat exchanger and the rear end plate is L2, and L1 is more than L2; the bottom plate of the shell comprises a front inclined plane, a plane and a rear inclined plane which are sequentially connected, the front inclined plane is connected with the front end plate, the rear inclined plane is connected with the rear end plate, the angle between the front inclined plane and the plane is larger than the angle between the rear inclined plane and the plane, and the projection proportion of the front inclined plane, the plane and the rear inclined plane in the plane direction is 10: 9: 3-12:9: 5; the angle between the front bevel and the plane is between 150 and 170 degrees.

2. The fan-coil unit of claim 1, wherein L1/L2 is 1.5 ≤ L1/L2 ≤ 2.5.

3. The fan coil unit of claim 1, wherein a ratio of a height of the air inlet to a height of the front end panel is between 3/5-4/5; the ratio of the air inlet area of the air inlet to the area of the windward side of the heat exchanger is 1/4-1/3.

4. The fan-coil unit of claim 1, wherein the number of the inlet vents is the same as the number of the fans, and wherein when a plurality of inlet vents are provided, the ratio of the distance between adjacent inlet vents to the width of the inlet vents is between 1/2-3/4.

5. The fan-coil unit of claim 1, wherein a baffle is disposed within the housing and secured to an inner side of the front end plate above the air inlet.

6. The fan-coil unit of claim 5, wherein the deflector comprises a planar deflector portion and a beveled deflector portion connected to each other, the planar deflector portion being secured to the inner side surface of the front end plate above the air inlet, the beveled deflector portion being inclined toward the base plate.

7. the fan coil unit of claim 6, wherein the angle between the planar and angled fairings is between 120 ° and 160 °.

8. The fan coil unit of claim 6, wherein a projection of the angled deflector in the direction of the air inlet opening has an area ratio to the air inlet opening of between 1/12-1/10.

9. The fan coil unit of claim 6, wherein a ratio of a maximum distance between the baffle and the front end plate to a distance between the heat exchanger and the front end plate is between 1/8-1/6.