A wet curtain leakage protection structure and tower cooling fan

Abstract

The present invention provides a wet curtain missing installation protection structure and a tower cooling fan, comprising: a rear shell, comprising an installation groove for installing a wet curtain, a water supply port is provided in the installation groove, and the cooling water flowing out of the water supply port flows to the wet curtain; a water receiving trough is provided in the installation groove, the water receiving trough is used to receive cooling water, the water receiving trough is controlled by a driving mechanism to move relative to the installation groove, and the water receiving trough has a first state located on the cooling water flow path, and a second state separated from the cooling water flow path; an induction switch is provided on the wet curtain and / or the rear shell, the induction switch is used to detect whether the wet curtain is installed, and the driving mechanism is controlled by the induction switch. The water receiving trough enters the cooling water flow path, and the cooling water flowing out of the water supply port falls into the water receiving trough. Water intrusion and its interior are prevented, and the operation of the cooling fan circuit is protected from being affected. When the water flow falls into the water receiving trough, the gravitational potential energy of the water flow is less converted into kinetic energy, the collision degree between the water flow and the water receiving trough is significantly reduced, and the noise of the cooling fan operation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of safety protection structures for cooling fans, and in particular to a wet curtain leakage protection structure and a tower cooling fan. Background Art

[0002] A cooling fan is a fan that uses water evaporation to absorb heat to achieve cooling purposes. The cooling fan includes a water tank and a wet curtain. The wet curtain is used to absorb water. When the air flows through the wet curtain with water, the water evaporates and absorbs heat. Therefore, the temperature of the air passing through the wet curtain is reduced, achieving the purpose of cooling.

[0003] In order to improve the heat absorption performance of the wet curtain, the wet curtain surface needs to be filled with water. Therefore, water from the water tank is usually pumped above the wet curtain to supply water to the wet curtain from top to bottom.

[0004] However, when users disassemble and repair the cooling fan, they often remove the wet curtain. Even when reinstalling, the cooling fan can still work without the wet curtain. Therefore, users tend to forget to reinstall the wet curtain.

[0005] When the wet curtain is not installed, the water in the water tank is still pumped to the top of the wet curtain installation position. Without the wet curtain to absorb water, the water will fall into the fan. Water entering the fan will affect the normal operation of electrical components and even pose a safety hazard.

[0006] On the other hand, the water drawn above the wet curtain installation position converts its gravitational potential energy into kinetic energy when it falls, and falls into the inside of the cooling fan, creating a loud noise, and the water flow will form a large splashing area. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art that the cooling fan has a safety hazard when the wet curtain is not installed, thereby providing a wet curtain missing protection structure and a tower cooling fan.

[0008] A wet curtain leakage protection structure, comprising:

[0009] The rear shell includes a mounting groove for mounting a wet curtain, wherein a water supply port is provided in the mounting groove, and the cooling water flowing out of the water supply port flows toward the wet curtain;

[0010] A water receiving trough is provided in the installation trough, the water receiving trough is used to receive the cooling water, the water receiving trough is controlled by a driving mechanism to move relative to the installation trough, and the water receiving trough has a first state of being located on the cooling water flow path, and a second state of being separated from the cooling water flow path;

[0011] The induction switch is arranged on the wet curtain and / or the rear housing. The induction switch is used to detect whether the wet curtain is installed. The driving mechanism is controlled by the induction switch.

[0012] The water receiving groove is slidably connected in the installation groove.

[0013] The driving mechanism comprises:

[0014] A motor, arranged on the rear housing;

[0015] A cam is arranged at the output end of the motor, and a rotary groove for embedding the cam is arranged on the water receiving groove.

[0016] The water receiving groove is provided with a limiting sliding block, the inner wall of the installation groove is provided with a limiting sliding groove, and the limiting sliding block is slidably supported in the limiting sliding groove.

[0017] The limiting sliding groove extends along the depth direction of the mounting groove.

[0018] The rotary trough is located at the bottom of the water receiving trough.

[0019] The water receiving tank also includes:

[0020] The limiting contact pins form the rotating groove between every two of the limiting contact pins.

[0021] When the water receiving trough is in the second state, the distances from the point where the motor is connected to the cam to the limit contact feet on both sides are the same.

[0022] The water receiving tank also includes:

[0023] A return pipe, one end of which is connected to the water receiving tank, and the other end of which extends to the water tank below the rear shell.

[0024] The rear shell and / or the base below the rear shell are provided with a clearance hole for the return pipe to pass through.

[0025] A tower cooling fan, comprising:

[0026] The wet curtain missing protection structure described in any of the above schemes;

[0027] An upper cover is detachably mounted on the upper part of the rear shell, wherein the upper cover comprises a water pumping chamber, and the water supply port is connected to the water pumping chamber;

[0028] The base is arranged below the rear shell, and the base includes a water tank, which is used to transport cooling water to the pumping bin.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. The present invention provides a wet curtain missing installation protection structure, comprising: a rear shell, comprising a mounting groove for mounting the wet curtain, a water supply port being provided in the mounting groove, and cooling water flowing out of the water supply port flows toward the wet curtain; a water receiving trough, provided in the mounting groove, for receiving the cooling water, the water receiving trough being controlled by a driving mechanism to move relative to the mounting groove, the water receiving trough having a first state located on the cooling water flow path, and a second state separated from the cooling water flow path; a sensing switch, provided on the wet curtain and / or the rear shell, the sensing switch being used to detect whether the wet curtain is installed, and the driving mechanism being controlled by the sensing switch.

[0031] The induction switch is used to sense whether the wet curtain is installed. When it is determined that the wet curtain is not installed, a signal is sent to the driving mechanism to control the driving mechanism to drive the water receiving trough to move to the first state, so that the water receiving trough enters the flow path of the cooling water. At this time, since the wet curtain is not installed, when the cooling fan is working, the cooling water flowing out of the water supply port falls into the water receiving trough. The water receiving trough collects the outflowing water to prevent water from intruding into and inside, and protects the operation of the cooling fan circuit from being affected. At the same time, since the water receiving trough is located near the water supply port, when the water flow falls into the water receiving trough, compared with the high drop in the prior art, the gravitational potential energy of the water flow is less converted into kinetic energy, so the degree of collision between the water flow and the water receiving trough is significantly reduced, and the noise of the cooling fan operation is significantly reduced.

[0032] 2. The wet curtain missing protection structure provided by the present invention has a water receiving trough slidably connected in the installation trough

[0033] The sliding connection method can ensure that the water receiving trough can be away from the wet curtain in the second state to prevent the wet curtain from absorbing water.

[0034] 3. The wet curtain missing protection structure provided by the present invention, the driving mechanism includes: a motor, which is arranged on the rear shell; a cam, which is arranged at the output end of the motor, and a rotating groove for embedding the cam is provided on the water receiving groove.

[0035] Since the cam is rotatably connected in the revolving groove, a horizontal thrust is generated when the cam rotates, driving the water receiving groove to slide along a preset path, thereby realizing the switching of the water receiving groove between the first state and the second state.

[0036] 4. The wet curtain missing protection structure provided by the present invention has a limiting sliding block on the water receiving groove, a limiting sliding groove on the inner wall of the installation groove, and the limiting sliding block is slidably supported in the limiting sliding groove.

[0037] The limit slider and the limit chute cooperate with each other to limit the water receiving trough to slide along a preset path under the push of the cam. Because the limit slider is slidably supported in the limit chute, the water receiving trough is supported on the limit chute. During the rotation of the cam, the water receiving trough is always supported on the limit chute. Therefore, the minimum distance between the cam and the inner wall of the rotary trough during the rotation process is not less than zero.

[0038] 5. In the wet curtain missing installation protection structure provided by the present invention, the limiting sliding groove extends along the depth direction of the installation groove.

[0039] Since the wet curtain is located on the opening of the installation slot, when the wet curtain is installed, the water receiving slot is located inside the installation slot. When the wet curtain is not installed, the induction switch controls the water receiving slot to slide from the inside of the installation slot to the opening of the installation slot, and slides along the extension direction of the limit slide slot to the flow path of the cooling water.

[0040] 6. In the wet curtain missing protection structure provided by the present invention, the rotary trough is located at the bottom of the water receiving trough.

[0041] When the rotary groove is located at the bottom of the water receiving groove, the opening of the water receiving groove extends in a direction away from the water receiving groove, so the cam can be installed on the extension path of the rotary groove, and the cam has a large installation space, which is convenient for users to disassemble and repair.

[0042] 7. The wet curtain missing protection structure provided by the present invention, the water receiving trough further comprises: limiting contact feet, and the rotating trough is formed between every two limiting contact feet.

[0043] The limit contact feet are used to resist the cams respectively, and when the cams rotate, the torque of the cams is converted into a thrust for driving the water receiving trough to slide horizontally.

[0044] 8. In the wet curtain missing protection structure provided by the present invention, when the water receiving trough is in the second state, the distances from the place where the motor is connected to the cam to the limit contact feet on both sides are the same.

[0045] At this time, if the water receiving trough wants to move to the first state, because the output shaft of the motor is located below the center of gravity of the cam, it is only necessary to control the drive motor to rotate clockwise to achieve the translation of the water receiving trough.

[0046] 9. The wet curtain missing protection structure provided by the present invention, the water receiving tank also includes: a return pipe, one end of which is connected to the water receiving tank, and the other end of which extends to the water tank below the rear shell.

[0047] The return pipe can return the water collected by the water tank to the water tank in time.

[0048] 10. In the wet curtain missing protection structure provided by the present invention, the rear shell and / or the base below the rear shell are provided with a clearance hole for the return pipe to pass through.

[0049] On the one hand, the clearance hole can allow the return pipe to pass through, and on the other hand, when the return pipe slides along the water receiving trough, it can provide sufficient movement space for the return pipe.

[0050] 11. The present invention also provides a tower cooling fan, comprising: the wet curtain missing installation protection structure described in any of the above schemes; an upper cover, which is detachably installed above the rear shell, and the upper cover includes a water pumping tank, and the water supply port is connected to the water pumping tank; a base, which is arranged below the rear shell, and the base includes a water tank, and the water tank is used to transport cooling water to the water pumping tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 A schematic diagram showing the structure of the present invention;

[0053] Figure 2 A schematic diagram showing the position of the clearance hole of the present invention;

[0054] Figure 3 An exploded view showing the positional relationship between the upper cover, the rear shell, and the base;

[0055] Figure 4 A three-dimensional diagram showing the structure of the driving mechanism;

[0056] Figure 5 A three-dimensional diagram showing a water receiving tank structure;

[0057] Figure 6 The schematic diagram is a schematic diagram showing the movement of the water receiving trough controlled by the cam;

[0058] Figure 7 The figure is a schematic diagram showing the setting position of the induction switch in one embodiment.

[0059] Description of reference numerals:

[0060] 1. Back shell; 11. Mounting groove; 12. Water inlet; 13. Make way hole; 14. Upper cover; 141. Pumping bin; 15. Limit slide; 2. Water receiving trough; 21. Return pipe; 22. Rotating trough; 23. Limit contact foot; 24. Limit slider; 3. Motor; 31. Cam; 32. Connecting rod; 4. Base; 41. Water tank; 5. Induction switch. DETAILED DESCRIPTION

[0061] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] Example 1

[0066] This embodiment provides a wet curtain missing protection structure, such as Figure 1 , Figure 2As shown, it includes: a rear shell 1, including a mounting groove 11 for mounting a wet curtain, a water supply port 12 is provided in the mounting groove 11, and the cooling water flowing out of the water supply port 12 flows to the wet curtain; a water receiving tank 2 is provided in the mounting groove 11, the water receiving tank 2 is used to receive the cooling water, the water receiving tank 2 is controlled by a driving mechanism to move relative to the mounting groove 11, and the water receiving tank 2 has a first state located on the cooling water flow path, and a second state separated from the cooling water flow path; a sensor switch 5 is provided on the wet curtain and / or the rear shell 1, the sensor switch 5 is used to detect whether the wet curtain is installed, and the driving mechanism is controlled by the sensor switch 5. The sensor switch 5 is used to sense whether the wet curtain is installed. When it is determined that the wet curtain is not installed, a signal is sent to the driving mechanism to control the driving mechanism to drive the water receiving tank 2 to move to the first state, so that the water receiving tank 2 enters the cooling water flow path. At this time, since the wet curtain is not installed, when the cooling fan is working, the cooling water flowing out of the water supply port 12 falls into the water receiving tank 2. The water receiving tank 2 collects the outflowing water to prevent water from entering and inside the tank, thus protecting the cooling fan circuit from being affected. At the same time, since the water receiving tank 2 is located near the water supply port 12, when the water flows into the water receiving tank 2, compared with the high drop in the prior art, the gravitational potential energy of the water flow is less converted into kinetic energy, so the collision degree between the water flow and the water receiving tank 2 is significantly reduced, and the noise of the cooling fan is significantly reduced.

[0067] There is no specific restriction on the location of the induction switch 5. In this embodiment, Figure 3 , Figure 7 As shown, the induction switch 5 is arranged on the rear shell 1, specifically located below the rear shell 1. When the wet curtain is buckled and installed on the mounting groove 11, the induction switch 5 is triggered, so that the induction switch 5 determines that the wet curtain has been installed, and sends a command to the motor 3, so that the motor 3 controls the water receiving tank 2 to move inside the mounting groove 11, thereby leaving the flow path of the cooling water, that is, the second position of the water receiving tank 2. At this time, the water flowing out of the water supply port 12 falls directly on the wet curtain, and the water diffuses from the top to the bottom of the wet curtain to the entire wet curtain, thereby obtaining a larger evaporation area and improving the cooling effect of the cold fan. As an alternative embodiment, the induction switch 5 is arranged in the mounting groove 11. As another alternative embodiment, the induction switch 5 is arranged on the base 4 or the wet curtain.

[0068] The induction switch 5 includes an induction element. In this embodiment, Figure 3 , Figure 7, the sensing element is a pressure sensor. The wet curtain has a protrusion. When the wet curtain is buckled on the installation groove 11, the protrusion contacts the pressure sensor, so that the pressure sensor determines that the wet curtain has been installed, otherwise it determines that the wet curtain has not been installed. As an alternative embodiment, the sensing element is a photosensitive sensor. When the wet curtain is installed, it covers the front of the photosensitive part of the photosensitive sensor, making the environment around the photosensitive part darker, thereby determining that the wet curtain is installed, otherwise it determines that the wet curtain is not installed.

[0069] There is no specific limitation on the switching method of the water receiving tank 2 between the first state and the second state. Figure 1 , Figure 2 As shown, the water receiving trough 2 is slidably connected in the mounting groove 11. The sliding connection method can ensure that the water receiving trough 2 can be away from the wet curtain in the second state to prevent the wet curtain from absorbing water. As an alternative embodiment, the water receiving trough 2 is rotatably connected in the mounting groove 11. The water receiving trough 2 is controlled by the driving mechanism to rotate into the flow path of the cooling water, and rotate out of the flow path of the cooling water.

[0070] In this embodiment, Figure 3 , Figure 4 As shown, the driving mechanism includes: a motor 3, which is arranged on the rear housing 1; a cam 31, which is arranged at the output end of the motor 3, and a revolving groove 22 for embedding the cam 31 is provided on the water receiving tank 2. Since the cam 31 is rotatably connected in the revolving groove 22, the cam 31 generates a horizontal thrust when rotating, driving the water receiving tank 2 to slide along a preset path, thereby realizing the switching of the water receiving tank 2 between the first state and the second state.

[0071] Among them, Figure 5 , Figure 6 As shown, the water receiving trough 2 is provided with a limit slider 24, and the inner wall of the mounting groove 11 is provided with a limit slide groove 15, and the limit slider 24 is slidably supported in the limit slide groove 15. The limit slider 24 and the limit slide groove 15 cooperate with each other to limit the water receiving trough 2 to slide along a preset path under the push of the cam 31. Because the limit slider 24 is slidably supported in the limit slide groove 15, the water receiving trough 2 is supported on the limit slide groove 15. During the rotation of the cam 31, the water receiving trough 2 is always supported on the limit slide groove 15. Therefore, the minimum distance between the cam 31 and the inner wall of the rotary groove 22 during the rotation process is not less than zero.

[0072] Combination Figure 2 and Figure 3, the limiting slide groove 15 extends along the depth direction of the mounting groove 11. Since the wet curtain is located on the opening of the mounting groove 11, when the wet curtain is installed, the water receiving groove 2 is located inside the mounting groove 11. When the wet curtain is not installed, the induction switch 5 controls the water receiving groove 2 to slide from the inside of the mounting groove 11 to the opening of the mounting groove 11, and slides along the extension direction of the limiting slide groove 15 to the flow path of the cooling water.

[0073] There is no specific restriction on the location of the rotary groove 22. In this embodiment, Figure 3 - Figure 5 As shown, the rotary groove 22 is located at the bottom of the water receiving trough 2. When the rotary groove 22 is located at the bottom of the water receiving trough 2, the opening of the water receiving trough 2 extends in a direction away from the water receiving trough 2, so the cam 31 can be installed on the extension path of the rotary groove 22, and the cam 31 has a larger installation space. It is convenient for users to disassemble and repair. As an alternative embodiment, the rotary groove 22 is located on the outer wall of the water receiving trough 2, or the rotary groove 22 is located inside the water receiving trough 2. When the rotary groove 22 is located inside the water receiving trough 2, the output shaft of the motor 3 passes through the side wall of the water receiving trough 2, and the output shaft of the motor 3 is rotatably connected to the side wall of the water receiving trough 2. A waterproof structure is provided at the position where the output shaft of the motor 3 is connected to the side wall of the water receiving trough 2.

[0074] There is no specific limitation on the shape of the rotary groove 22. Figure 4 and Figure 6 The water receiving trough 2 further includes: a limiting contact pin 23, and the rotation groove 22 is formed between each two of the limiting contact pins 23. The limiting contact pins 23 are respectively used to contact the cams 31, and when the cams 31 rotate, the torque of the cams 31 is converted into a thrust to drive the water receiving trough 2 to slide horizontally. In this embodiment, the rotation groove 22 is a C-shaped structure with one end open. As an alternative embodiment, the rotation groove 22 can be a strip hole with a closed periphery.

[0075] Among them, Figure 6 As shown, when the water receiving trough 2 is in the second state, the distances from the place where the motor 3 is connected to the cam 31 to the limit contact feet 23 on both sides are the same. At this time, if the water receiving trough 2 wants to move to the first state, because the output shaft of the motor 3 is located below the center of gravity of the cam 31, it is only necessary to control the drive motor 3 to rotate clockwise to achieve the translation of the water receiving trough 2.

[0076] In this embodiment, Figure 2 , Figure 5 As shown, the water receiving tank 2 further includes a return pipe 21, one end of which is connected to the water receiving tank 2, and the other end of which extends to the water tank 41 below the rear shell 1. The return pipe 21 can return the water collected by the water receiving tank 2 to the water tank 41 in a timely manner.

[0077] There is no specific restriction on the material of the return pipe 21. In this embodiment, Figure 5 As shown, the return pipe 21 is a metal pipe such as PVB or stainless steel. As an alternative embodiment, the return pipe 21 is a hose made of a flexible material.

[0078] There is no specific limitation on the structure of the return pipe 21. In this embodiment, Figure 5 As shown, the return pipe 21 includes a first part and a second part that are detachably connected. The first part is connected to the water tank 2, and the second part is connected to the first part and the water tank 41. The first part can be made of a flexible material. As an alternative embodiment, the return pipe 21 is an integrally formed whole.

[0079] In this embodiment, Figure 1 , Figure 2 As shown, the rear shell 1 and / or the base 4 below the rear shell 1 is provided with a clearance hole 13 for the return pipe 21 to pass through. The clearance hole 13 can allow the return pipe 21 to pass through on the one hand, and on the other hand, when the return pipe 21 slides with the water receiving tank 2, it can provide sufficient movement space for the return pipe 21.

[0080] There is no specific restriction on the equipment for implementing the wet curtain missing protection structure in this embodiment. In this embodiment, the wet curtain missing protection structure is implemented on a tower cooling fan. Figure 3 A tower cooling fan comprises: the wet curtain missing protection structure described in any of the above schemes; an upper cover 14, which is detachably mounted on the upper part of the rear shell 1, the upper cover 14 comprises a water pumping bin 141, the water supply port 12 is connected to the water pumping bin 141; a base 4, which is arranged below the rear shell 1, the base 4 comprises a water tank 41, and the water tank 41 is used to transport cooling water to the water pumping bin 141. As an alternative embodiment, the wet curtain missing protection structure of this embodiment can also be applied to other equipment that uses evaporative cooling water for cooling.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A wet curtain missing protection structure, characterized in that: include: The rear housing (1) comprises a mounting groove (11) for mounting a wet curtain, wherein a water supply port (12) is provided in the mounting groove (11), and cooling water flowing out of the water supply port (12) flows toward the wet curtain; A water receiving trough (2) is arranged in the installation groove (11), the water receiving trough (2) is used to receive the cooling water, the water receiving trough (2) is controlled by a driving mechanism to move relative to the installation groove (11), and the water receiving trough (2) has a first state of being located on the cooling water flow path, and a second state of being separated from the cooling water flow path; The induction switch (5) is arranged on the wet curtain and / or the rear housing (1), the induction switch (5) is used to detect whether the wet curtain is installed, and the driving mechanism is controlled by the induction switch (5).

2. The wet curtain missing protection structure according to claim 1 is characterized in that: The water receiving groove (2) is slidably connected in the installation groove (11).

3. The wet curtain missing protection structure according to claim 2 is characterized in that: The driving mechanism comprises: A motor (3) is arranged on the rear housing (1); A cam (31) is arranged at the output end of the motor (3), and a rotary groove (22) for embedding the cam (31) is provided on the water receiving groove (2).

4. The wet curtain missing protection structure according to claim 3 is characterized in that: The water receiving groove (2) is provided with a limiting slide block (24), the inner wall of the installation groove (11) is provided with a limiting slide block (15), and the limiting slide block (24) is slidably supported in the limiting slide block (15).

5. The wet curtain missing protection structure according to claim 4 is characterized in that: The limiting sliding groove (15) extends along the depth direction of the installation groove (11).

6. The wet curtain missing protection structure according to claim 3, characterized in that: The rotary trough (22) is located at the bottom of the water receiving trough (2).

7. The wet curtain missing protection structure according to any one of claims 3 to 6, characterized in that: The water receiving tank (2) further comprises: The limiting contact pins (23) form the rotating groove (22) between every two of the limiting contact pins (23).

8. The wet curtain missing protection structure according to claim 7, characterized in that: When the water receiving trough (2) is in the second state, the distances from the point where the motor (3) is connected to the cam (31) to the limit contact feet (23) on both sides are the same.

9. The wet curtain missing protection structure according to claim 1, characterized in that: The water receiving tank (2) further comprises: A return pipe (21), one end of which is connected to the water receiving tank (2), and the other end of which extends to the water tank (41) below the rear shell (1).

10. The wet curtain missing protection structure according to claim 9, characterized in that: The rear shell (1) and / or the base (4) below the rear shell (1) is provided with a clearance hole (13) for the return pipe (21) to pass through.

11. A tower cooling fan, characterized in that: include: The wet curtain missing protection structure according to any one of claims 1 to 10; An upper cover (14) is detachably mounted on the upper part of the rear shell (1), wherein the upper cover (14) comprises a water pumping chamber (141), and the water supply port (12) is connected to the water pumping chamber (141); The base (4) is arranged below the rear shell (1), and the base (4) comprises a water tank (41), and the water tank (41) is used to transport cooling water to the water pumping tank (141).

Images