CN111156632A - Drainage device, cooling fan and control method - Google Patents

Abstract

The application relates to the technical field of air conditioning devices, in particular to a drainage device for a cooling fan, and further relates to a cooling fan comprising the drainage device and a control method of the cooling fan. The drainage device comprises a rotating shaft, a curtain cloth, a slideway and a driving assembly, wherein the rotating shaft is rotatably and transversely arranged in a wet curtain mounting area of the cooling fan; one end of the curtain cloth is fixed on the rotating shaft and can be wound on the rotating shaft along with the rotation of the rotating shaft; the curtain cloth can slide along the slide way; the driving assembly is used for driving the rotating shaft to rotate so that the curtain cloth slides along the slide way to be unfolded or wound on the rotating shaft. When the wet curtain is not installed, the driving assembly controls the roller curtain to be unfolded, and water flowing down from the water distribution hole flows down along the roller curtain and flows back to the water tank below; when the wet curtain is loaded, the driving assembly controls the roller shutter to be folded, the cooling fan works normally, potential safety hazards brought by the user when the wet curtain is not loaded are well avoided, noise is reduced, and safe and comfortable product experience is brought to the user.

Description

Drainage device, cooling fan and control method

Technical Field

The application relates to the technical field of air conditioning devices, in particular to a drainage device for a cooling fan, and further relates to a cooling fan comprising the drainage device and a control method of the cooling fan.

Background

The thermantidote is as a novel cooling mode between fan and air conditioner, increasingly receive consumers' favor in general, the thermantidote generally inhales and blows off through the fan through wet curtain humidification air again at present, wet curtain and fan are the indispensable structure of thermantidote, the wet curtain plays the effect of dispersion rivers, to the thermantidote that can dismantle wet curtain, the water that the water pump was gone up flows from the distributive hole at thermantidote top, the wet curtain is flowed through to the water column that the distributive hole flows, can increase the area of contact with the air, increase the evaporation capacity, make the water column form that the water smoke that the naked eye can not see blows off along with the wind from the air outlet.

When the user is pulling down wet curtain, clean organism and wet curtain back, often can forget the installation wet curtain and just open the water pump and use the humidification function, the water that gets off from the distributive hole can directly flow down, the fan probably will flow down water inhales and lead to damaging, has the potential safety hazard, and the water droplet that directly flows down can form certain noise in the basin of below, seriously influences the quality safety and the user experience of thermantidote.

Disclosure of Invention

In order to solve the technical problem, the application provides a drainage device for evaporating cooling fan, cooling fan that includes this drainage device and the control method of this cooling fan to can prevent that the water droplet from being inhaled electrical equipment under the condition of forgetting the installation wet curtain, and reduce the noise pollution that the water droplet produced when falling.

In order to achieve the above object, according to one aspect of the present technical solution, the present technical solution provides a flow guiding device for a cooling fan.

According to this application embodiment's drainage device, it includes:

the rotating shaft is used for being rotatably and transversely arranged in a wet curtain mounting area of the cooling fan;

one end of the curtain cloth is fixed on the rotating shaft and can be wound on the rotating shaft along with the rotation of the rotating shaft;

the curtain cloth can slide along the slide way; and

and the driving component is used for driving the rotating shaft to rotate so that the curtain cloth slides along the slide way to be unfolded or wound on the rotating shaft.

Further, the slide includes interconnect's first section and second section, the contained angle of first section and second section is the obtuse angle.

Further, the rotating shaft is arranged at the end of the first section, and the length of the first section is smaller than that of the second section.

Furthermore, a supporting rod is fixed at the other end of the curtain cloth opposite to the end fixed on the rotating shaft, and the end part of the supporting rod is limited in the slideway in a sliding manner.

Furthermore, the drainage device further comprises a detection device connected with the driving assembly, and the detection device is used for detecting whether the cooling fan is provided with a wet curtain or not.

Further, the driving assembly comprises a motor and a controller, an output shaft of the motor is connected with the rotating shaft, and the controller is used for controlling the rotating direction and the rotating time of the motor.

Further, the curtain detection device is at least one of a physical switch, a hall sensing element and a photoelectric sensor.

In order to achieve the above object, according to a second aspect of the present technical solution, the present technical solution further provides a cooling fan.

According to thermantidote according to this application embodiment, its drainage device that includes this application first aspect provides, curtain cloth is under the expansion state, is located the water hole is just right in the top branch of thermantidote curtain cloth.

Furthermore, pivot, slide and drive assembly all fix on the casing of thermantidote.

In order to achieve the above object, according to a third aspect of the present disclosure, the present disclosure further provides a method for controlling a cooling fan according to the second aspect of the present disclosure.

The control method of the cooling fan according to the embodiment of the application comprises the following steps:

detecting whether a cooling fan is provided with a wet curtain or not;

if the cooling fan is not provided with the wet curtain, the driving assembly drives the curtain cloth to slide and unfold along the slide way when the cooling fan is started;

if the cooling fan is provided with the wet curtain, when the evaporative cooling fan is started, the driving assembly drives the curtain cloth to slide along the slide way and be wound on the rotating shaft.

The drainage device that provides at above-mentioned technical scheme and install its thermantidote sets up a roll curtain formula drainage structure in the book curtain installation area of thermantidote, plays the effect of drainage. When the wet curtain is not installed, the driving assembly controls the roller curtain to be unfolded, and water flowing down from the water distribution hole flows down along the roller curtain and flows back to the water tank below; when the wet curtain is loaded, the driving assembly controls the roller shutter to be folded, the cooling fan works normally, potential safety hazards brought by the user when the wet curtain is not loaded are well avoided, noise is reduced, and safe and comfortable product experience is brought to the user.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic structural reference view of a drainage device provided by an embodiment of the present application in a deployed state;

FIG. 2 is a schematic reference view of the drainage device provided by the embodiment of the present application in a retracted state;

FIG. 3 is a partial structural reference view schematically illustrating a support rod according to an embodiment of the present disclosure;

FIG. 4 is a schematic reference diagram illustrating a control system of the drainage device provided by an embodiment of the present application;

FIG. 5 is a schematic structural reference diagram illustrating the structure of the flow guiding device installed on the cooling fan casing according to the embodiment of the present application; and

fig. 6 schematically shows a flow chart of a control method of a cooling fan according to an embodiment of the present application.

In the figure:

1. a rotating shaft; 2. a cord fabric; 3. a slideway; 301. a first stage; 302. a second stage; 4. a drive assembly; 401. a motor; 402. a controller; 5. a support bar; 501. mounting grooves; 502. installing a seam; 503. a hollow cavity; 6. a detection device; 7. a housing.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings are intended to cover non-exclusive inclusions, such that a system, product or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

In this application, the terms "upper", "lower", "inner", "middle", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In the working process of the evaporative cooling fan, water pumped up by the water pump flows out from the water outlet at the top of the cooling fan, and a water column flowing out from the water outlet flows through the wet curtain, so that the contact area with air can be increased, the evaporation capacity is increased, and the water column forms invisible water mist which is blown out from the air outlet along with wind. When the user is pulling down wet curtain, clean organism and wet curtain back forget the wet curtain of installation very easily, at this moment open the thermantidote and use the humidification function, the water that gets off from the distributive hole can directly flow down, the fan probably will flow down the water intake lead to damaging, has the potential safety hazard, and the water droplet that directly flows down can form certain noise in the basin of below, seriously influences the quality safety and the user experience of thermantidote. In order to solve the problem, the embodiment of the present application provides a drainage device as shown in fig. 1 and 2, which is used for being mounted on a cooling fan with a detachable wet curtain structure, such as an evaporative cooling fan. The drainage device as shown in the figure comprises a rotating shaft 1, curtain cloth 2, a slide way 3 and a driving assembly 4, wherein the rotating shaft 1 is used for being rotatably and transversely arranged in a wet curtain installation area of the cooling fan, one end of the curtain cloth 2 is fixed on the rotating shaft 1 and can be wound on the rotating shaft 1 along with the rotation of the rotating shaft 1, the curtain cloth 2 can be slid by the slide way 3, and the driving assembly 4 is used for driving the rotating shaft 1 to rotate so that the curtain cloth 2 is stretched or wound on the rotating shaft 1 along the slide way 3 in a sliding manner. Under the driving action of the driving assembly 4, the curtain 2 has two states as shown in fig. 1 and fig. 2, fig. 1 is a schematic view of the curtain 2 in an unfolded state, when the driving assembly 4 controls the rotating shaft 1 to rotate in a first direction, the curtain 2 slides upwards along the slide way 3 and gradually winds around the rotating shaft 1, and finally reaches the state as shown in fig. 2, at the moment, the curtain 2 is in a folded state, and when the driving assembly 4 continuously controls the rotating shaft 1 to rotate in a second direction opposite to the first direction, the curtain 2 slides downwards along the slide way 3 and gradually unwinds the curtain 2 wound around the rotating shaft 1, and finally reaches the state as shown in fig. 1. When curtain cloth 2 is in the state of opening, make its position be in between the basin distributive hole at thermantidote top and thermantidote major structure, can play and stop that big water droplet blows off from the air outlet, can also prevent that the water droplet from spattering on the electric elements in the thermantidote major structure, reduction potential safety hazard. When setting up curtain cloth 2 and having certain angle, can be so that the water column that the water diversion hole flows directly drips on curtain cloth 2, curtain cloth 2 can play the drainage effect this moment, with rivers drainage to the water tank of below to avoid the direct noise pollution that causes that drips in the water tank of water droplet. The material of the curtain cloth 2 is not specifically limited, and all the effects of blocking and guiding can be achieved, the curtain cloth is preferably waterproof cloth, and the waterproof cloth is preferably breathable and waterproof, so that when the wet curtain is not filled, the influence on fan wind of cold wind is reduced when the curtain cloth 2 is unfolded to block water drops.

The slide way 3 is preferably in a double-slide way form as shown in fig. 1 and 2, and is respectively positioned on two sides of the curtain cloth 2, so that the curtain cloth 2 slides more stably, and the slide way 3 can also play a limiting role in the curtain cloth 3 after being unfolded, so as to prevent the curtain cloth 2 from swinging and folding to influence the drainage effect. As an alternative embodiment, as shown in fig. 2, the chute 3 comprises a first section 301 and a second section 302 connected to each other, and the included angle between the first section 301 and the second section 302 is an obtuse angle.

In specific use, second section 302 can be vertically installed on the casing of thermantidote, and first section 301 is towards one side bending of thermantidote air outlet for expand curtain fabric 2 on first section 301 and form the tilt plane, and this tilt plane can just be to the distributive hole of thermantidote top basin, makes the water that the distributive hole stayed directly drip on this tilt plane, then along forming vertical plane through curtain fabric 2 that expands on second section 302 and leave, accomplishes drainage work. Can fully adapt to the inner structure of current thermantidote like this, can accomplish the transformation work to current thermantidote in narrow and small space down. Preferably, drainage device pivot 1 sets up the tip of first section 301, the length of first section 301 is less than the length of second section 302 can make the bending part of slide minimize like this, saves the installation space of fore-and-aft direction in the thermantidote, during specific setting, can set up the wet curtain of thermantidote in the curtain cloth below of first section 301 department to wet curtain is in curtain cloth the place ahead of second section 302 department, thereby makes under the condition of having installed wet curtain, can not influence the packing up and the expansion of curtain cloth 2 among the drainage device.

In some embodiments, as shown in fig. 1 and 2, a support rod 5 is fixed to the other end of the curtain cloth 2 opposite to the end fixed to the rotating shaft 1, that is, the rotating shaft 1 and the support rod 5 are respectively arranged on two opposite edges of the curtain cloth 2, and the end of the support rod 5 is slidably limited in the slideway 3. On the first hand, the support rod 5 can play a role of supporting the curtain cloth 2, so that the curtain cloth 2 can be spread along the direction of the support rod under the action of the support rod 5 and the rotating shaft 1; in the second aspect, the support rod 5 is in limit fit with the slide way 3 to realize the stable sliding of the curtain cloth 2; in the third aspect, the weight of the support rod 5 is adjusted to play a role of counterweight, when the curtain cloth 2 is unfolded, the gravity of the curtain cloth 2 cannot overcome the resistance in the unfolding process generally, so that the curtain cloth 2 is folded and curled, and the curtain cloth 2 can be smoothly unfolded under the action of the counterweight of the support rod 5.

As shown in fig. 3, a specific optional structure of the support rod 5 is provided, as shown in fig. 3, a hollow cavity 503 is provided inside the support rod 5, the surface of the support rod 5 is recessed inwards to form an installation groove 501, an installation slot 502 is provided at the bottom of the installation groove 501, the installation groove 501 is communicated with the hollow cavity 503 through the installation slot 502, when in use, one end of the curtain cloth 2 passes through the installation slot 502 to enter the hollow cavity 503, and the edge of the curtain cloth 2 is fixed in the hollow cavity 503 through a fixing member with a size larger than the installation slot 501. Of course, the structural arrangement of the rotating shaft 1 can also refer to the supporting rod 5, so that the fixing of the rotating shaft 1 and the curtain cloth 2 is realized. In addition, the bracing piece 5 preferably adopts elastic material, for example can slightly bend the plastic, can insert the slide 3 respectively with the both ends of bracing piece 5 in the installation through slightly bending bracing piece 5, loosen the back, bracing piece 5 can be because elastic recovery original state, the card reaches fixed mounting's purpose on the slide, and the installation is dismantled conveniently.

As shown in fig. 4, in order to realize the automatic control function of the drainage device of the present application, the drainage device may further include a detection device 6 connected to the driving assembly 4, where the detection device 6 is configured to detect whether the cooling fan is installed with a wet curtain. For example, when the detection device 6 detects that the cooling fan is not provided with the wet curtain, the detection device 6-shaped driving assembly 4 sends a first signal, and when the cooling fan is started, the driving assembly 4 drives the curtain cloth 2 to slide and unfold along the slide rail 3; when detecting device 6 detects that the thermantidote has installed wet curtain, detecting device 6 sends the second signal to drive assembly 4, and when starting the thermantidote, drive assembly 4 drive curtain cloth 2 is followed slide 3 slides and convolute in pivot 1. Optionally, the driving assembly 4 includes a motor 401 and a controller 402, an output shaft of the motor 401 is connected to the rotating shaft 1, and the controller 402 is configured to receive a signal sent by the detecting device 6 and control a rotation direction and a rotation time of the motor based on the signal. The detecting device 6 may be any switch or sensor having a detecting function in the prior art, and any function that can detect whether the wet curtain is installed may be implemented, and includes but is not limited to at least one of a physical switch, a hall sensing element, and a photoelectric sensor. For example, when the detection device 6 is selected as a physical switch, when the cooling fan is provided with a wet curtain, the wet curtain triggers the physical switch, the physical switch sends a signal to the controller 402 of the driving assembly 4, that is, the physical switch needs to be installed at a position where the wet curtain can be pressed in an installation state, after the wet curtain is installed, the wet curtain mechanically triggers the physical switch, and the physical switch can be fixed on a housing of the cooling fan through a buckle structure; for another example, when the detection device 6 selects a hall sensing element, a magnetic material is disposed on the wet curtain, the magnetic material needs to be within the sensing range of the hall sensing element when the wet curtain is installed in the installation state, the magnetic material triggers the hall sensing element when the wet curtain is installed on the cooling fan, the hall sensing element sends a signal to the controller 402 of the driving assembly 4, and the hall sensing element can also be fixed on the casing of the cooling fan through a buckle structure. Of course, the manner of detecting whether the wet curtain is installed is not limited to this, and other implementation forms may also be used.

Specifically, when the driving assembly 4 includes the motor 401, the motor 401 drives the rotating shaft 1 to rotate in a specific manner, including but not limited to a coaxial transmission, a gear transmission and a belt transmission. The driving mechanism can be other specific driving forms, for example, a projection can be formed at the end of the output shaft of the motor 401, a groove matched with the projection is formed at one end of the rotating shaft 1, the projection is inserted into the groove, the matching coupling of the projection and the groove can realize the power output of the motor 401, and the driving mechanism is simple in structure and easy to assemble. In specific use, can install pivot 1 at the top of the casing of thermantidote (specifically can be the backshell), fixed orifices are dug at the relevant position at casing top, pass the fixed orifices with the both ends of pivot 1, motor 401 can fix on the casing equally, the trompil diameter on the casing is than pivot 1's diameter a bit greatly more usually, in order to prevent that pivot 1 from taking place the drunkenness in the axial, can increase bearing arrangement or install the jump ring at the both ends of the first body of rod 1, the diameter of jump ring is greater than the trompil on the casing, can play limiting displacement to pivot 1 in the axial.

It should be noted that other configurations and operations of the drainage device of the present application will be known to those skilled in the art, and reference may be made to the structure of the related devices in the prior art, and will not be described in detail herein.

The embodiment of the application still provides a thermantidote, and it includes the drainage device that the above-mentioned embodiment of this application provided, curtain cloth 2 is under the expansion state, is located the water hole is just right in the top of thermantidote curtain cloth 2. Specifically, as shown in fig. 5, the rotating shaft 1 is located on one side, close to the air outlet, of the water dividing hole in the top of the cooling fan, the slide 3 is far away from one side, away from the air outlet, of the top water outlet of the cooling fan, and water in the water dividing hole flow can directly drip on the curtain cloth 2 after being unfolded. When the wet curtain of neglected loading, the thermantidote drives opening of curtain cloth 2 through drive assembly 4, can separate thermantidote top water column and air outlet and electrical structure down to make the water column flow back to the water tank along curtain cloth 2, avoid arousing the noise pollution that the direct drippage of water droplet caused or the electrical safety problem that the drippage spatters and arouse when the wet curtain of neglected loading. The rotating shaft 1, the slide way 3 and the driving assembly 4 can be fixed on a shell 7 of the cooling fan. The slideway 3 can be a groove directly formed in the shell 7 or a crack formed in a rib structure arranged on the shell 7 in parallel, and the concrete implementation form can be diversified.

The evaporative cooling fan in the embodiment of the present application may control the drainage device by the following control method, as shown in fig. 6, specifically, the control method may include the following steps:

firstly, detecting whether a cooling fan is provided with a wet curtain or not; this step can be implemented by the detection device 6 in the above embodiment, or other implementations are possible, and the following description will specifically refer to a physical switch capable of sending an electrical signal as the detection device 6;

if the cooling fan is not provided with the wet curtain, the physical switch cannot be triggered, the cooling fan is started at the moment, the controller 402 of the motor 401 is controlled not to receive an electric signal sent by the physical switch, the motor 401 of the driving assembly 4 can be controlled to rotate positively by the controller 402 to drive the rotating shaft 1 to rotate positively, the curtain cloth 2 is driven by the rotating shaft 1 to slide along the slide way 3 to be unfolded, after the curtain cloth 2 is completely unfolded, the motor 401 stops rotating, the motor forward rotation time can be specifically set in the controller 402 according to the unfolding length of the curtain cloth or an in-place sensor is set, when the curtain cloth reaches a limiting position, the in-place sensor senses and sends an in-place signal to the controller 402, and the motor 401. At the moment, the water column flowing down from the top of the evaporative cooling fan can flow back to the water tank at the lower part along the curtain cloth 2, so that the noise pollution or safety problem caused by the neglected-loading of the wet curtain is avoided.

If the cold fan has installed wet curtain, the physics switch can be triggered, start the cold fan this moment, the controller 402 of control motor 401 can receive the signal of telecommunication that the physics switch sent, the controller 402 can control the motor 401 reversal of drive assembly 4, drive pivot 1 reversal, curtain cloth 2 slides and convolutes on pivot 1 along slide 3 under pivot 1 drives, after curtain cloth 2 rolls up completely, motor 401 stall, specifically can set up the time of motor reversal or set up the sensor that targets in place in controller 402 according to the length of packing up of curtain cloth, when curtain cloth reachs limiting position, through the sensor response that targets in place and send the signal of targeting in place for controller 402, control motor 401 stall. At this moment, the cooling fan can work normally.

The cooling fan disclosed in the embodiment of the present application is because including the drainage device that above-mentioned embodiment provided, consequently the cooling fan that has this drainage device also has all above-mentioned technological effects, no longer gives unnecessary details one by one here. Other constructions and operations of the cooling fan will be known to those skilled in the art and will not be described in detail herein.

Some embodiments in this specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a drainage device, this drainage device are used for the thermantidote, its characterized in that, drainage device includes:

the rotating shaft (1) is rotatably and transversely arranged in a wet curtain mounting area of the cooling fan;

one end of the curtain cloth (2) is fixed on the rotating shaft (1) and can be wound on the rotating shaft (1) along with the rotation of the rotating shaft (1);

the curtain cloth (2) can slide along the slide way (3); and

the driving assembly (4) is used for driving the rotating shaft (1) to rotate so that the curtain cloth (2) can be unfolded or wound on the rotating shaft (1) along the slide way (3) in a sliding manner.

2. The drainage device according to claim 1, characterized in that the chute (3) comprises a first section (301) and a second section (302) connected to each other, the angle between the first section (301) and the second section (302) being an obtuse angle.

3. The drainage device according to claim 2, characterized in that the shaft (1) is arranged at the end of the first section (301), the length of the first section (301) being smaller than the length of the second section (302).

4. The drainage device according to claim 1, characterized in that a support rod (5) is fixed on the curtain cloth (2) at the end opposite to the end fixed on the rotating shaft (1), and the end of the support rod (5) is limited in the slideway (3) in a sliding manner.

5. The drainage device according to claim 2, characterized by further comprising a detection device (6) connected with the driving assembly (4), wherein the detection device (6) is used for detecting whether the cooling fan is provided with a wet curtain or not.

6. The drainage device according to claim 5, characterized in that the drive assembly (4) comprises a motor (401) and a controller (402), the output shaft of the motor (401) is connected with the rotating shaft (1), and the controller (402) is used for controlling the rotating direction and rotating time of the motor.

7. The drainage device according to claim 5, characterized in that the detection means (6) is at least one of a physical switch, a Hall sensing element and a photo sensor.

8. A cooling fan, characterized by comprising the drainage device of any one of claims 1-7, wherein the curtain cloth (2) is positioned at the top part of the cooling fan and is opposite to the curtain cloth (2) in the unfolded state.

9. The cooling fan according to claim 8, wherein the shaft (1), the slideway (3) and the driving assembly (4) are fixed on the housing (7) of the cooling fan.

10. The control method of the cooling fan according to claim 8 or 9, characterized by comprising the steps of:

detecting whether a cooling fan is provided with a wet curtain or not;

if the cooling fan is not provided with the wet curtain, the driving assembly drives the curtain cloth to slide and unfold along the slide way when the cooling fan is started;

if the cooling fan is provided with the wet curtain, when the evaporative cooling fan is started, the driving assembly drives the curtain cloth to slide along the slide way and be wound on the rotating shaft.

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