JP2006177579A - Spray system for lowering temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray system for lowering a temperature, having high cooling energy efficiency, allowing sprayed mist to effectively evaporate, and preventing a person passing under the system from being wetted by droplet. <P>SOLUTION: This spray system for lowering a temperature of an object space by spraying the pressurized water as mist, comprises a spray head mounted at an upper portion of the object space for spraying the pressurized water as mist, and a drain pot mounted at a lower portion of the spray head to receive droplet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature lowering spray system which is provided in a customer collection facility such as a pavilion of an exposition and uses a cooling action by latent heat due to mist evaporation.

  A conventional temperature drop spraying system includes a spray nozzle installed at or near an entrance of a customer collection facility, a pump for supplying pressurized water to the spray nozzle, and a water distribution pipe for distributing pressurized water from the pump to the spray nozzle. . And when cooling is needed, mist is sprayed from the spray nozzle, and the customer collection facility is cooled by the latent heat accompanying transpiration of the mist (for example, refer patent document 1).

JP-A-6-109341

However, when the mist is sprayed horizontally or upwards in an attempt to prevent the droplets that have been sprayed from merging from falling onto the ground, the sprayed mist is swept horizontally by the horizontal component of the wind. There is a problem in that it collides with the spray nozzle and the water pipe and dew condensation occurs on their surfaces, which becomes a large droplet, falls as a droplet, and wets the person who passes under.
Further, in order to speed up the mist transpiration, when the high-pressure air is used to reduce the diameter of the sprayed mist and the two-fluid jet is used, the average particle diameter of the mist can be reduced to 10 μm or less. Therefore, a very large amount of energy must be consumed to supply the heat, and there is a problem that the cooling energy efficiency is poor.

  It is an object of the present invention to provide a cooling spray system that is efficient in cooling energy, effectively sprays mist, and does not wet a person passing under by droplets.

  A spraying system for temperature drop according to the present invention is a spraying system for temperature drop that sprays pressurized water as a mist to lower the temperature of a target space, and is disposed above the target space and pressurized. A spray head that sprays water as a mist and a drain pot that is disposed below the spray head and receives droplets are provided.

  The effect of the temperature lowering spray system according to the present invention is that the mist sprayed from the spray head grows into a large diameter droplet and drops, so that the droplet is received by the drain pot, so that it is below the spray head. Prevents people from getting wet.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a temperature lowering spray system according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the spray head according to the first embodiment. FIG. 3 is a cross-sectional view of the spray head according to the first embodiment. FIG. 4 is a cross-sectional view taken along the central axis of the spray nozzle according to the first embodiment. FIG. 5 is a configuration diagram of the pressurized water supply apparatus according to the first embodiment. FIG. 6 is a functional block diagram of the mist control panel according to the first embodiment. FIG. 7 is a timing chart of mist spraying.
2 is a partial cross-sectional view of the spray head as viewed downward from the BB cross section of FIG. 3 is a cross-sectional view of the spray head as viewed in the horizontal direction from the AA cross section of FIG.

As shown in FIG. 1, the spray system 1 for cooling a temperature according to the first embodiment includes a spray head 3 provided at the tips of two pillars 2 that stand vertically from the ground, and pressurized water supplied to the spray head 3. Of a sub-distribution pipe 4 to which water is distributed, a pressurized water supply apparatus 5 for supplying pressurized water via the sub-distribution pipe 4, a temperature / humidity meter 6 for measuring the ambient temperature and humidity and transmitting to the pressurized water supply apparatus 5; A drain pot 7 disposed below and fixed to the pillar 2 is provided. The drain pot 7 is a shallow dish whose center is the lowest so that mist adheres to the surfaces of the column 2, the spray head 3, and the sub-distribution pipe 4, grows to a large diameter, and can receive the falling droplet. Shaped member. This central portion is fixed to the column 2. Further, a drain pipe 8 for draining the received droplets is connected to the central portion, and water is allowed to flow to the ground through the drain pipe 8. Further, when the spray head 3 and the drain pot 7 are projected on the same horizontal plane in the vertical direction, the outer periphery of the projection of the drain pot 7 includes the outer periphery of the projection of the spray head 3.
Further, water is supplied from the water supply 9 to the pressurized water supply device 5. In addition, although the two pillars 2 are described as an example, the number may be determined as appropriate according to the size of the facility to be cooled.

As shown in FIG. 2, the spray head 3 distributes the pressurized water introduced through the sub-distribution pipe 4 so that the pressure is uniformly applied to the six spray nozzles 10. The six extension pipes 12 provided for the separation of the distance, and the six spray nozzles 10 for spraying by using pressurized water as a mist. And the length of the extension piping 12 is 15 cm, and the installation height of the spray nozzle 10 is 4 m. The installation altitude of the spray nozzle 10 is set based on the Sauter average particle size and 90% cumulative volume particle size of the mist.
Here, it is described that the six spray nozzles 10 are provided in the spray head 3, but the present invention is not limited to this, and the number of spray nozzles 10 may be one to N.

  As shown in FIGS. 2 and 3, the spray header 11 is a hexagonal cylinder in which a central axis is arranged in the vertical direction and a hollow 15 having a hexagonal cross section is formed inside. A hole 16 is provided in the center of the lower end face of the hexagonal cylinder, to which the sub-distribution pipe 4 is connected, and the outside and the cavity 15 having a hexagonal cross section communicate with each other. Further, a hole 17 to which the extension pipe 12 is connected is provided at the center of each side surface of the hexagonal cylinder, and the outside and the cavity 15 having a hexagonal cross section communicate with each other. The pressurized water is poured from the holes 16 on one end face and supplied to the extension pipe 12 from the holes 17 on the six side faces. The spray header 11 is made of stainless steel.

As shown in FIG. 3, the extension pipe 12 is a cylindrical tube, one end of which is vertically attached to the side surface of the spray header 11, is bent downward in the longitudinal direction, and the other end is the spray header 11. The central axis of the cylindrical tube is inclined from the horizontal plane including the lower end face of the lower side so as to bow at an angle θ = 22.5 °. The extension pipe 12 is made of stainless steel.
A straight pipe 18 is attached to the other end of the extension pipe 12, and the spray nozzle 10 is fitted therein. In addition, the water pressure applied to the pressurized water receiving cavity 21 of the spray nozzle 10 with a pressure converter (model PVD-100ka, measurement range 0 to 10 MPa) 14 branched from one straight pipe 18 is attached. Is measured and used as the spray water pressure. Usually, the relationship between the spray water pressure and the output water pressure of the high-pressure pump is obtained in advance, and the spray water pressure is managed by managing the output water pressure of the high-pressure pump. A Bourdon tube pressure gauge or the like may be used for measuring the water pressure. The straight pipe 18 is made of stainless steel.
The central axis of the spray nozzle 10 connected in this way is inclined downward by an angle θ22.5 ° from a horizontal plane including the lower end face of the spray header 11.

  As shown in FIG. 4, the spray nozzle 10 has a substantially cylindrical housing 19. A section for receiving the pressurized water supplied via the extension pipe 12 along the central axis of the cylindrical housing 19 is located on the downstream side of the circular pressurized water receiving cavity 20 and the pressurized water receiving cavity 20. A rib 21 that accommodates a circular cavity 21 smaller than the diameter of the cavity 20 and a pressure-sensitive check valve 22 and has a cross section that is larger than the diameter of the cavity 21 and the outer edge of the downstream end face protrudes in the center direction. The partitioned valve storage cavity 24 and the piece 25 are accommodated, and are formed of a circular cavity 26 having a cross section equal to the diameter of the pressurized water receiving cavity 20 and a funnel-shaped cavity 27 continuous with the cavity 26. An orifice 29 connected to the tip of the jet generating cavity 28 and the funnel-shaped cavity 27 is provided continuously.

A pressure-sensitive check valve 22 that closes / opens the opening 21 a on the downstream side of the cavity 21 is inserted into the valve storage cavity 24.
When the pressure sensitive check valve 22 abuts the opening 21 a on the downstream side of the cavity 21, the blocking ball 30 that blocks the flow of pressurized water, one end contacts the blocking ball 30, and the other end is fixed to the rib 23. A spring 31 is bent so that a predetermined spring pressure is applied to the blocking ball 30.
When the water pressure in the cavity 21 exceeds a predetermined spring pressure, the blocking ball 30 and the opening 21a of the cavity 21 are separated from each other, and water flows into the valve housing cavity 24 from the gap.

  Further, in the jet generation cavity 28, the pressure water is ejected as a swirling jet, and the piece 25 for colliding with the inner surface of the funnel-shaped cavity 27 is in contact with the inner surface of the cylindrical cavity 26, and the direction of the central axis of the spray nozzle 10 Move while sliding. A spiral groove 32 is dug in the side surface of the piece 25, and a swirl flow path for swirling and ejecting pressurized water is formed by the groove 32 and the inner surface of the cylindrical cavity 26.

Next, a procedure for spraying pressurized water in the spray nozzle 10 will be described.
When pressurized water is poured into the pressurized water receiving cavity 20 and the water pressure reaches a predetermined value, the blocking ball 30 is pushed and the pressurized water flows into the valve housing cavity 24.
Then, pressurized water pushes one end face of the piece 25 from the hole 23 a formed in the center of the rib 23, and the piece 25 is moved along the central axis of the spray nozzle 10 toward the funnel-shaped cavity 27. The pressurized water passes through the groove 32 while being swirled, and is jetted from the end of the groove 32.
This jet collides with the inner surface of the funnel-shaped cavity 27 to become a collision jet and is sprayed from the orifice 29 as a mist.

  As shown in FIG. 5, the pressurized water supply device 5 includes a high pressure pump 40, a main valve 41 disposed on the downstream side of the high pressure pump 40, and a drain valve 43 that opens and closes a flow path for draining water in the main distribution pipe 42. A selection valve 44 that selects the supply of pressurized water to each spray head 3, a high-pressure pump 40, and a mist control panel 45 that controls various valves. The sub-distribution pipes 4 are connected to the selection valves 44, respectively. The dry bulb temperature and wet bulb temperature measured by the thermohygrometer 6 are input to the mist control panel 45.

The main valve 41 and the selection valve 44 are communicated with each other through the main water distribution pipe 42, and the drain valve 43 is communicated with the main water distribution pipe 42 through a drain pipe 46 branched from the middle of the main water distribution pipe 42. The main water pipe 42, the drain pipe 46, and the sub water pipe 4 are each made of stainless steel. The high pressure pump 40 and the main valve 41 are communicated with each other by a rubber blade hose 47 to smooth the pulsation generated by the positive displacement high pressure pump 40.
Further, in order to remove dust contained in the pressurized water, a 20 μm square opening filter (not shown) is interposed at the outlet of the high-pressure pump 40.
Further, in order to supply pressurized water with a small amount of metal ions so that scale does not deposit on the main water distribution pipe 42, the sub water distribution pipe 4, and the spray head 3, tap water softened from a water softener (not shown) is supplied to the high pressure pump 40. Have been supplied.

  As shown in FIG. 6, the mist control panel 45 includes a spray determining means 50 for determining whether or not spraying is possible based on the dry bulb temperature and wet bulb temperature measured by the thermohygrometer 6, and if spraying is possible, the spray amount is determined. A water supply amount control means 51 for controlling the amount of water supplied from the high-pressure pump 40, a spray sequence control means 52 for controlling the high-pressure pump 40 and various valves, and an air diagram database 53 in which wet air diagrams are stored. Have. The mist control panel 45 is composed of a computer having a CPU, a RAM, a ROM, and an interface circuit.

Next, a sequence for supplying pressurized water from the high-pressure pump 40 will be described with reference to FIG.
The spray sequence control means 52 of the mist control panel 45 first opens the main valve 41. At the same time, the drain valve 43 is opened.
Next, the spray sequence control means 52 starts the operation of the high-pressure pump 40 and supplies pressurized water from the blade hose 47 to the main water distribution pipe 42. As a result, the air remaining in the main water distribution pipe 42 is pushed out together with the water from the drain valve 43, and a uniform water pressure is applied in the main water distribution pipe 42.
Next, the spray sequence control means 52 closes the drain valve 43. Thereby, the water pressure in the main water distribution pipe 42 reaches a desired water pressure, for example, 6 MPa.
Next, the spraying sequence control means 52 opens the selection valve 44 connected to the spraying head 3 that performs spraying, and the pressurized water is propagated as the rising pressure wave through the sub-distribution pipe 4, and water is supplied to the spraying head 3. Is done. At this time, the water pressure applied by being poured into the pressurized water receiving cavity 20 reaches approximately 0 MPa to 6 MPa in 4 seconds. When the water pressure becomes 1 MPa or higher in this way, the pressure-sensitive check valve 22 of the spray nozzle 10 is opened and spraying of mist is started.

On the contrary, when the spraying of the mist is finished, the spray sequence control means 52 opens the drain valve 43 so that the descending pressure wave is propagated in the child water distribution pipe 4, and the water pressure in the pressurized water receiving cavity of the spray nozzle 10 is changed. Since the pressure is reduced to 1 MPa or less, the pressure-sensitive check valve 22 is closed, and mist spraying is stopped.
Then, after about 3 seconds from the opening of the drain valve 43, the operation of the high-pressure pump 40 is stopped and the selection valve 44 is closed. Thereafter, the main valve 41 and the drain valve 43 are closed.

Next, the state of the mist sprayed from the spray head 3 will be described.
The sprayed mist descends while evaporating. When the wind is flowing in the horizontal direction, the mist adheres to the surfaces of the spray head 3, the sub-distribution pipe 4, and the column 2 to form a large-diameter droplet and falls downward. However, since the outer periphery in the horizontal direction of the drain pot 7 is outside the point farthest from the column 2 of the spray head 3 in the horizontal direction, it receives the falling liquid droplets and is drained from the drain pipe 8 to the ground. The person who passes under the spray head 3 is not wetted.

  In such a temperature lowering spray system 1, even if the mist sprayed from the spray head 3 grows into a droplet having a large diameter and falls, it is received by the drain pot 7, so that it prevents the person underneath from getting wet. it can.

  Although the example in which the extension pipe 12 has the same length has been described, when the extension pipe 12 is composed of different lengths, the point of the spray nozzle 10 attached to the tip of the longest extension pipe 12 is set vertically. By projecting onto the drain pot 7 and setting the diameter of the drain pot 7 so that the outer periphery of the drain pot 7 is outside the projected point, the person who passes under is similarly not wetted.

Embodiment 2. FIG.
FIG. 8 is a block diagram of a temperature lowering spray system according to Embodiment 2 of the present invention.
As shown in FIG. 8, in the spraying system 1 </ b> B for temperature drop according to the second embodiment, the spray head 3 is suspended from a beam 60 on the ceiling of a facility by a suspension member 61. The spray head 3 is connected to a sub-distribution pipe 4 piped between a beam 60 and a suspension member 61.
And the center part of the drain pot 7B is being fixed to the lower end of the coupling member 62 extended below from the spray header 11. FIG. The drain pot 7B has a shallow dish shape with the center part being the lowest part. The outer periphery of the shallow dish-shaped drain pot 7 </ b> B includes the spray head 3 when the drain pot 7 </ b> B is moved in the vertical direction and superimposed on the spray head 3.

  In such a temperature lowering spray system, even in the case of the spray head 3 suspended from the beam 60 or the like, the drain pot 7B is disposed below the spray head 3, so that the diameter is large as in the first embodiment. The droplets are prevented from getting wet by a person passing underneath.

Embodiment 3 FIG.
FIG. 9 is a configuration diagram of a temperature lowering spray system according to Embodiment 3 of the present invention.
The temperature-falling spray system 1C according to the third embodiment is different from the temperature-falling spray system 1 according to the first embodiment in that a plurality of spray nozzles 10 are directly connected to the sub-distribution pipes 4 without extending through the spray header 11, respectively. The other parts are the same, and thus the same parts are denoted by the same reference numerals and the description thereof is omitted.

As shown in FIG. 9, the sub-distribution pipe 4 is piped around a building rail 63. An extension pipe 12 is connected in the horizontal direction from the middle of the child water distribution pipe 4. The spray nozzle 10 is disposed on the extension of the extension pipe 12.
When a mist adheres to the surfaces of the spray nozzle 10 and the extension pipe 12 and a droplet having a large diameter falls, the drain pot 7C for receiving the droplet is connected to the coupling member 62B below the spray nozzle 10 and the extension pipe 12. It is suspended from the crosspiece 63 via

  In this way, when the temperature lowering spray system 1C is to be installed in a linearly long facility, for example, in the entrance passage, the drain pot 7C is suspended below the spray nozzle 10 and the extension pipe 12. Even if a large-diameter droplet falls, it does not wet a person passing underneath.

It is a block diagram of the spray system for temperature fall concerning Embodiment 1 of this invention. It is a partial cross section figure of the spray head of this invention. It is sectional drawing of this spray head. It is sectional drawing along the central axis of the spray nozzle. It is a block diagram of a pressurized water supply apparatus. It is a functional block diagram of a mist control panel. It is a timing chart of mist spraying. It is a block diagram of the spraying system for temperature fall concerning Embodiment 2 of this invention. It is a block diagram of the spraying system for temperature fall concerning Embodiment 3 of this invention.

Explanation of symbols

  1, 1B, 1C Temperature drop spray system, 2 pillars, 3 spray heads, 4 water distribution pipes, 5 pressurized water supply device, 6 thermohygrometer, 7, 7B, 7C drain pot, 8 drain pipe, 9 water supply, 10 spray nozzle , 11 Spray header, 12 Extension pipe, 14 Pressure transducer, 15 Cavity, 16, 17 hole, 18 Straight pipe, 19 Housing, 20, 21 Cavity, 21a Opening, 22 Pressure-sensitive check valve, 23 Rib, 23a hole, 24 Valve storage cavity, 25 pieces, 26, 27 cavity, 28 Jet generation cavity, 29 Orifice, 30 Blocking ball, 31 Spring, 32 groove, 40 High pressure pump, 41 Main valve, 42 Main water pipe, 43 Drain valve, 44 selection Valve, 45 mist control panel, 46 drain pipe, 47 blade hose, 50 spray judgment means, 51 water supply amount control means, 52 spray sequence control means, 53 Vapor diagram database, 60 beams, 61 hanging lower member, 62,62B coupling member 63 bar.

Claims (4)

In a spraying system for lowering the temperature of the target space by spraying pressurized water as a mist,
A spray head disposed above the target space and spraying the pressurized water as a mist;
A drain pot disposed below the spray head for receiving droplets;
A spraying system for cooling down, characterized in that   2. The temperature drop according to claim 1, wherein when the spray head and the drain pot are projected on the same horizontal plane in a vertical direction, the outer periphery of the projection of the drain pot includes the outer periphery of the projection of the spray head. Spraying system.   3. The spraying system for temperature reduction according to claim 1 or 2, wherein the drain pot is suspended from the spray head via a coupling member.   4. The spraying system for temperature reduction according to claim 1, wherein the drain pot is made of a dish-shaped member having a central portion that is the lowest portion and that increases toward the outer peripheral portion. 5.

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