Large space cooling device

Abstract

To provide a large space temperature decreasing device which can effectively decrease a temperature in a large space, such as a factory, a warehouse, and a large scale commercial facility, at low costs.SOLUTION: A large space temperature decreasing device 1 according to the invention includes: a ceiling fan 3 which is attached to a ceiling or the like of a space whose temperature is decreased (a temperature decreasing space), causes rotary vanes 9 to rotate to stir air in the temperature decreasing space; and a mist sprayer 4 which makes water into mist to spray the mist from nozzles 17. The nozzle 17 is arranged so that a position of a jet port is located at the outer side relative to an outer diameter of the rotary vane 9 in a plan view.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a large-space temperature-lowering device for lowering the temperature of large spaces such as factories, warehouses, and large commercial facilities.

Background Art

[0002] As a device for lowering the temperature of a space where people gather, there is, for example, a spraying system for temperature lowering disclosed in Patent Document 1. This spraying system for temperature lowering is composed of a spray nozzle installed at the entrance of a customer-attracting facility or in its vicinity, a pump for supplying pressurized water to the spray nozzle, and a water distribution pipe for distributing the pressurized water from the pump to the spray nozzle. Mist is sprayed from the spray nozzle, and the customer-attracting facility is cooled by the latent heat accompanying the evaporation of the mist.

[0003] In addition, as a device for improving the comfort of a large space, there is a ceiling fan attached to the ceiling of factories, warehouses, sports facilities, large commercial facilities, etc. (see Patent Document 2). The ceiling fan has no effect of lowering the space temperature, but by generating an air flow in the space, it makes people less likely to feel uncomfortable even when the air temperature is relatively high, or by stirring the air, it can improve the efficiency of heating, cooling, and humidity control by air conditioning equipment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the spray cooling system of Patent Document 1, the temperature of the space can be lowered by about 2°C (see paragraph

[0029] of Patent Document 1), but it is difficult to achieve a greater temperature drop. Also, in places such as warehouses and factories where water-sensitive items like cardboard boxes are stored, the spray amount of the mist is restricted, and there is a problem that it is difficult to expect a greater cooling effect.

[0006] On the other hand, the ceiling fan has no problem of water wetting due to the mist, but it cannot be expected to lower the temperature. However, by using it in combination with air-conditioning equipment such as an air conditioner, it can be expected to cool the entire interior uniformly, but this is premised on expensive air-conditioning equipment, and it is not possible to expect a cooling effect greater than the capacity of the air-conditioning equipment.

[0007] The present invention has been made to solve such problems, and an object thereof is to provide a large-space cooling device that can inexpensively and effectively lower the temperature of a large space such as a factory, a warehouse, or a large commercial facility.

Means for Solving the Problems

[0008] (1) The large-space cooling device according to the present invention includes a ceiling fan that is attached to the ceiling or the like of the space to be cooled and stirs the air in the space to be cooled by rotating the rotor blades, and a mist spraying device that turns water into a mist and sprays it from a nozzle. The nozzle is arranged such that the position of the injection port is outside the outer diameter of the rotor blades in a plan view.

[0009] (2) Further, in the device according to (1) above, the nozzle is composed of a plurality, and the plurality of nozzles are arranged with a predetermined interval between adjacent ones with the injection ports facing inward.

[0010] (3) Further, in the device according to (2) above, the plurality of nozzles are set such that the injection directions of adjacent nozzles are different.

[0011] (4) Also, in the invention according to the above (1) or (3), the nozzles are plural, and the plural nozzles are arranged in an arc shape with their injection ports facing inward, and the arc is a part of a virtual circle centered on a vertical line passing through the rotation center of the sealing fan.

Effect of the Invention

[0012] The large-space cooling device according to the present invention includes a sealing fan that is attached to the ceiling or the like of the space to be cooled and stirs the air in the space to be cooled by rotating the rotating blades, and a mist spraying device that turns water into a mist and sprays it from the nozzles. The nozzles are arranged such that in a plan view, the positions of the injection ports are outside the outer diameter of the rotating blades. Thus, the mist sprayed from the injection ports arranged outside is sucked by the sealing fan. Although the mist will evaporate during this suction process, since the injection ports are arranged outside the outer diameter of the rotating blades, the evaporation distance becomes longer by the distance of suction, and the mist can be evaporated more efficiently, and the cooling of the target space can be effectively performed.

Brief Description of the Drawings

[0013]

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MODE FOR CARRYING OUT THE INVENTION

[0014] As shown in FIGS. 1 and 2, the large space temperature-lowering device 1 according to one embodiment of the present invention includes a sealing fan 3 attached to the ceiling or the like of the space to be cooled, and a mist spraying device 4 that sprays water in a mist form from a nozzle. Hereinafter, each component will be described in detail.

[0015] <Space to be cooled> The temperature-lowering space targeted by the large space temperature-lowering device 1 of the present invention is not particularly limited, but is a large indoor space such as a factory, a warehouse, a sports facility, a large commercial facility, etc., and it is desired that the mist is in a dry state (a state where people and objects are not wetted). It is suitable for space. In the case of a factory or the like, the sealing fan 3 may not have a ceiling surface and the ceiling may be composed of beams 7 or the like. The ceiling or the like in this specification includes beams, frames, etc. that are above the floor surface and below the roof.

[0016] <Sealing fan> The sealing fan 3 is attached to the ceiling or the like of the space to be cooled, and includes an attachment portion 5 for attaching to the ceiling or the like, a motor 6, and a rotating blade 9 that is rotationally driven by the motor 6.

[0017] As shown in FIG. 2, five rotary blades 9 of this embodiment are provided at equal intervals in the rotational direction. However, the number, size (width and length), shape, etc. of the rotary blades 9 of the large space cooling device 1 according to the present invention are not particularly limited, and may be appropriately set in consideration of various conditions such as the size of the cooling target space to be installed and the installation height.

[0018] Note that the ceiling fan 3 is installed on the ceiling or the like indoors. Different from the blower fan, the outer diameter of the rotation locus of the rotary blade 9 (hereinafter referred to as "rotary blade locus") is 1.8 m to 3 m to 8 m, and the rotation speed is 1 to 220 rpm, mainly those with 60 to 75 rpm are targeted.

[0019] <Mist spraying device> The mist spraying device 4 sprays water in a mist form, and includes a water supply pipe 11 for supplying pressurized water, a header 13 provided at the end of the water supply pipe 11, a plurality (six) of branch pipes 15 branched from the header 13, and nozzles 17 attached to the ends of the respective branch pipes 15 for spraying mist. In the mist spraying device 4 of this embodiment, the header 13, the branch pipes 15, and the nozzles 17 are unitized as a dry mist unit 19. That is, six branch pipes 15 are provided at equal intervals in the circumferential direction around the header 13, and nozzles 17 are provided at the tips of the branch pipes 15. However, the mist spraying device 4 according to the present invention is not limited to such a unitized one.

[0020] The nozzles 17 are arranged such that the position of the injection port is outside the outer diameter of the rotary blade 9 as shown in FIGS. 1 and 2 in a plan view. In other words, the injection ports of the nozzles 17 are arranged outside the virtual circle connecting the tips of the rotary blades 9 when the rotary blades 9 are viewed in a plan view. The reason for setting the position of the injection port outside the outer diameter of the rotary blade 9 is as follows. When the ceiling fan 3 operates, the rotation of the rotating blades 9 generates air convection. This convection occurs downward from the rotating blades 9, hits the floor surface and then goes outward, and subsequently hits the wall surface of the building and goes upward. The upward convection hits the ceiling surface and heads toward the ceiling fan 3, and goes downward together with the newly generated convection from the rotating blades 9. Among this convection, the mist sprayed from the injection ports arranged outside the rotating blades 9 is sucked toward the side of the ceiling fan 3. Although the mist will evaporate during this suction process, since the injection ports are arranged outside the outer diameter of the rotating blades 9, the evaporation distance becomes longer by the distance of suction, and the mist can be efficiently evaporated, and the target space can be effectively cooled.

[0021] Also, it is desirable to spray the mist below the rotating blades 9 of the ceiling fan 3. Conversely, it is not preferable to spray all the mist directly above the rotating blades 9 (inside the circle that is the rotation locus of the rotating blades 9). If a large amount of mist is sprayed at this position, regardless of the distance from the rotating blades 9, the mist may adhere to the rotating blades 9 and other parts (such as the fixing parts) of the ceiling fan 3 before vaporizing due to the suction force of the rotating blades 9 and fall as water droplets.

[0022] In this embodiment, two dry mist units 19 are provided so as to face each other in the diameter direction of the circle that is the rotation locus of the rotating blades of the ceiling fan 3, but the number of dry mist units 19 is not limited to this, and it may be one or three or more. Regarding the number of nozzles 17 provided in the dry mist unit 19, although an example of six is shown in this embodiment, it is not limited to this, and it may be one or a plurality other than six.

[0023] The structure and function of the nozzle 17 are not particularly limited, but for example, those in the form disclosed in Patent Document 1 may also be used. That is, it includes a pressurized water receiving cavity formed in a substantially cylindrical housing, a pressure-sensitive check valve, a jet generation cavity, and an orifice. Pressurized water is injected into the pressurized water receiving cavity. When the water pressure reaches a predetermined value, the pressure-sensitive check valve opens, and the pressurized water becomes a collision jet in the jet generation cavity and is sprayed from the orifice as mist.

[0024] Mist is water droplets with a small diameter, and it is preferably about 8 to 160 μm as the average particle diameter. When the spray water pressure is low, the average particle size of the mist increases and the spray flow rate decreases, resulting in a small cooling effect. On the other hand, when the spray water pressure is high, the average particle size of the mist decreases and the spray flow rate increases, resulting in a high cooling effect. However, if the spray water pressure is too high, a large shock wave is applied to the piping etc., which is not preferable in terms of safety. Therefore, the spray water pressure is preferably between 0.5 MPa and 10 MPa.

[0025] The method for measuring the average particle size of the mist is, as shown in Patent Document 1, for example, the volume surface average particle size (referred to as the Sauter mean diameter) measured by the laser diffraction method at a location 50 mm away from the tip of the orifice on the central axis of the nozzle 17 is used. In the laser diffraction method, a laser diffraction particle size measuring instrument (manufactured by Malvern Instruments, Mastersizer - S type, laser used: He - Ne laser) is used to measure five times in the same manner, and the average value is used as the average particle size of the mist.

[0026] The operation of the large - space temperature - lowering device 1 of the present embodiment configured as described above will be described. Mist is sprayed from the nozzle 17 simultaneously with the rotation of the sealing fan 3. Due to the rotation of the sealing fan 3, an air flow is generated in the space centered on the sealing fan 3, flowing towards the center and downward. When the mist rides on this air flow, the mist sprayed from the nozzle 17 is discharged in an amount of water set to evaporate before reaching the floor surface, installed equipment, items to be stored, etc., and a high evaporation effect is exerted without wetting these, causing the surrounding temperature to drop suddenly. Furthermore, this flow hits the floor surface and then heads outward, and subsequently hits the wall surface of the building and becomes an upward flow. Due to this air flow, the air cooled by the evaporation of the mist is widely diffused, and the temperature can be effectively lowered even in a large space. Particularly, in the present embodiment, the nozzle 17 is arranged such that the position of the injection port is outside the outer diameter of the rotating blade 9 in a plan view. As a result, when the mist sprayed from the injection port is sucked towards the center of the reeling fan 3, the distance of movement is such that the distance related to evaporation is longer than simply dropping the mist, and thus the amount of mist to be sprayed can be increased accordingly, enabling the cooling effect to be further enhanced.

[0027] In the case of only spraying mist, as disclosed in Patent Document 1 mentioned above, the temperature dropped by about 2°C. However, according to the large-space temperature-lowering device 1 of the present embodiment, a temperature drop of 5°C to 6°C can be obtained. That is, the sealing fan 3 alone does not have the function of lowering the temperature, and only spraying mist results in a temperature drop of about 2°C. However, in the present embodiment where these are appropriately combined, a high temperature drop of 5°C to 6°C can be obtained.

[0028] Such a high temperature drop can be achieved because, compared with the case where the nozzle 17 is arranged directly below the sealing fan 3 or simply when only mist descends, the mist sprayed from the nozzle 17 moves laterally toward the downward airflow until it reaches the downward airflow of the sealing fan 3, resulting in a longer movement distance of the mist until it reaches the floor surface. That is, by increasing the movement distance of the mist, a high evaporation effect is produced, and a synergistic effect can be exerted due to an increase in the amount of sprayable mist and a decrease in the temperature of the entire space by circulating the cooled air.

[0029] Note that the sealing fan 3 and the spraying of the mist do not necessarily have to be at the same timing. The sealing fan 3 may be operated intermittently while the mist is sprayed continuously, or conversely, the sealing fan 3 may be operated continuously while the mist is sprayed intermittently. Even if the sealing fan 3 is operated intermittently, a certain effect can be obtained when the airflow in the room is generated by the sealing fan 3 depending on the indoor space. Also, depending on indoor conditions such as temperature and humidity, it may be better to spray the mist intermittently so that the mist does not fall as water droplets.

[0030] In the above description, the dry mist unit 19 was composed of a header 13, six branch pipes 15 provided at equal intervals in the circumferential direction around the header 13, and nozzles 17 provided at the tips of the branch pipes 15. Therefore, a plurality of nozzles 17 were arranged on a circumference centered on the header 13. However, the arrangement of the nozzles 17 is not limited to this and can take various forms.

[0031] For example, as shown in FIGS. 3 and 4, a plurality of nozzles 17 may be arranged such that the injection ports face inward (inside the virtual circle connecting the tips of the rotating blades 9 when viewed in plan) and adjacent ones are spaced apart by a predetermined distance. Specifically, as shown in FIG. 4, the dry mist unit 21 is composed of a linear header 23, six branch pipes 25 installed inwardly at a predetermined interval from the header 23, and nozzles 17 attached to the tips of the branch pipes 25. In the examples of FIGS. 3 and 4, the branch pipes 25 are attached at a downward 45° angle with respect to the horizontal header 23. As a result, the nozzles 17 are also oriented downward at 45°. Note that, as shown in FIGS. 5 and 6, the nozzles may be attached in the horizontal direction.

[0032] Also, as shown in FIGS. 7 and 8, a plurality of nozzles 17 may be arranged in an arc with their injection ports facing inward, such that the arc is a part of a virtual circle centered on a vertical line passing through the rotation center of the sealing fan 3. In the embodiment shown in FIGS. 7 and 8, the orientation of each nozzle 17 is downward at 45°, similar to that shown in FIGS. 3 and 4. In the embodiment shown in FIGS. 7 and 8, by arranging a plurality of nozzles 17 on the virtual circle, they are arranged at an equal distance from the sealing fan 3. For this reason, since the arrangement relationship between the mist sprayed from each nozzle 17 and the sealing fan 3 is the same, uniform evaporation of the mist sprayed from each nozzle 17 is possible.

[0033] Note that the examples shown in FIGS. 4, 6, and 8 are examples where the orientations of all the nozzles 17 are the same. However, as shown in FIGS. 9 to 11, the nozzles 17 may be arranged such that the orientations of adjacent nozzles 17 are different. Specifically, as shown in FIG. 11, the nozzles 17 arranged at both ends of the header 23 are oriented outward at 120° with respect to the header 23 and downward at 45°. Also, the two nozzles 17 arranged second from both ends of the header 23 are oriented outward at 110° with respect to the header 23, and their vertical direction is the horizontal direction (90° with respect to the vertical). Furthermore, the two nozzles 17 arranged third from both ends of the header 23 are oriented outward at 100° with respect to the header 23 and downward at 45°. By arranging them in this way, it becomes difficult for the mists sprayed from each nozzle 17 to come into contact with each other, and it is possible to prevent the mists from becoming droplets when they come into contact. When the mists become droplets, it becomes difficult for them to evaporate. However, in the embodiments of FIGS. 9 to 11, this can be prevented and evaporation can be ensured, thereby enhancing the temperature-lowering effect.

Explanation of Reference Numerals

[0034] 1 Outdoor space temperature-lowering device 3 Sealing fan 4 Mist spraying device 5 Mounting part 6 Motor 7 Beam 9 Rotating blade 11 Water supply pipe 13, 23 Header 15, 25 Branch pipe 17 Nozzle 19, 21 Dry mist unit

Claims

1. A ceiling fan that is attached to a beam or frame above the ceiling or floor surface of the space to be cooled and below the roof, and rotates the rotor blades to stir the air in the space to be cooled, and a mist spraying device that turns water into a mist and sprays it from a nozzle. The nozzle is arranged such that the position of the injection port is outside the outer diameter of the rotor blades in a plan view, and the nozzle is composed of a plurality of nozzles. The plurality of nozzles are arranged with a predetermined interval between adjacent ones with the injection ports facing inward. A large-space cooling device characterized by this.

2. The mist spraying device includes a water supply pipe that supplies pressurized water, a header provided at the end of the water supply pipe, a plurality of branch pipes branching from the header, and a plurality of nozzles provided at the ends of each branch pipe for spraying mist. The dry mist unit including the header, the branch pipes, and the nozzles is provided facing the diameter direction of the circle that is the locus of the rotor blades of the ceiling fan. The large-space cooling device according to Claim 1, characterized by this.

3. The plurality of nozzles provided on the plurality of branch pipes are set such that the injection directions of adjacent nozzles are different. The large-space cooling device according to Claim 2, characterized by this.

4. The plurality of nozzles provided on the plurality of branch pipes are arranged in an arc shape with the injection ports facing inward, and the arc is a part of a virtual circle centered on a vertical line passing through the rotation center of the ceiling fan. The large-space cooling device according to Claim 2, characterized by this.

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