Patent Application
20190172622
This invention relates to a power supply device for an ozone generator which generates ozone from gas containing oxygen by silent discharge.
In general, a power supply device for an ozone generator (ozonizer) has a large-capacity transformer, reactor and inverter, and further, high voltage is applied to the power supply device. Further, it is necessary to cool the above mentioned equipment, via a heat exchanger, housing, in which equipment of a power supply device is installed, is cooled. In Patent Document 1, it is disclosed such that in order to avoid deterioration of cooling efficiency due to increase of resistance in flow paths caused by condensation in a heat exchanger, by suppressing condensation at a part where resistance in flow paths is dominant, it is aimed to obtain housing which is excellent in cooling capacity.
In Patent Documents 2 and 3, it is disclosed such that by disposing a heat exchanger at a lower part of housing, while damage of internal parts is protected in a case where condensation occurs in a heat exchanger, internal equipment which generates heat is cooled. Further, in Patent Document 4, by disposing a heat exchanger being inclined at an acute angle to a bottom of casing in a casing, condensed water can be certainly discharged outside.
Regarding conventional power supply devices for an ozone generator which applies more than 100 kW of electric power, for example, a transformer, a reactor and an inverter are large and heavy, individually, therefore, in many cases, they are disposed in different housings. Further, their heat density is high, therefore, the configuration is designed such that designated wind tunnel is provided by using each heat exchanger and fan so as for cooling air to be sufficiently blown, and cooling is performed. Further, regarding the devices, high voltage is applied, therefore, while sufficient insulation distance is secured, from the point of safety, a partition plate for preventing electric shock is disposed, as a result, the size of the device is increased, and the configuration thereof is complicated. Consequently, the device have problems regarding disposition of devices which require maintenance, difficulties of operation and safety.
The present invention is made for solving the above mentioned problems, and aims to obtain a power supply device for an ozone generator having small size and simple configuration in which disposition of each device and cooling performance is optimized. Further, high voltage is applied to the power supply device for an ozone generator, therefore, the present invention aims to obtain a power supply device for an ozone generator having the configuration in which operation is easy to be performed during maintenance while insulation distance is secured and having excellent safety.
It is configured such that a power supply device for an ozone generator, which applies electric power to an ozone generator which generates ozone by silent discharge from gas containing oxygen, according to present invention comprises a transformer which transforms a voltage which is applied from a commercial AC power supply, an inverter which converts the AC voltage which is transformed by the transformer to be an AC voltage having higher frequency than a frequency of the commercial AC power supply and a reactor which is connected to an output of the inverter, wherein the transformer, the inverter and the reactor are disposed inside of one housing, a flat heat exchanger which cools passing air with cooling water is disposed at a lower part inside the housing, the transformer and the inverter are disposed above the heat exchanger, the reactor is disposed above the transformer and the inverter, a protection panel is disposed further toward the front side of the housing than the transformer and the inverter by being separated from a front door of the housing, and by a fan which is provided at a position inside the front door, cooling air is circulated by passing through an air passage which is a space between the front door and the protection panel, a space between the heat exchanger and a bottom of the housing, the heat exchanger, the transformer and the inverter, the reactor and the fan, sequentially.
According to present invention, a transformer, a reactor and an inverter are disposed in the same housing, the space between a protection panel which isolates from a high voltage and a front door is made to be an air passage, a fan is disposed at a position which is inside of the front door, cooling air whose heat is exchanged by a heat exchanger is circulated in the housing, therefore a power supply device for an ozone generator in which operation for maintenance of fan is easy, whose size can be miniaturized can be obtained.
Hereinafter, a power supply device for an ozone generator according to Embodiment 1 will be described based on
As shown in
A heating value of the transformer 3 and the inverter 4 is large, and configuration of them is complicated, therefore, cooling is difficult. Further, the inverter 4 incorporates semiconductor switches, therefore, in order to prevent damaging of the semiconductors, it is necessary to decrease a temperature. Consequently, by disposing the transformer 3 and the inverter 4 directly above the heat exchanger 2, cooling can be performed with cooling air which is cooled most in the housing 1, and the maximum temperature of the transformer 3 and the inverter 4 can be suppressed. By disposing the transformer 3 at back of the housing 1 being away 5 mm to 50 mm, the back-side panel of the housing 1 can also be used as partition of an air passage, cooling air can be aggressively flown to inside or outside surface of the transformer 3. Regarding a distance between the back of the housing 1 and the transformer 3, by considering a voltage to be applied to the transformer 3, the back surface of the housing 1 should be away from the transformer 3 by an amount of necessary insulation distance at least. Further, by disposing the transformer 3 being away from the inverter 4 by 5 mm to 100 mm, the back side of the inverter 4 can also be used as an air passage, consequently cooling air can be aggressively flown to inside or outside surface of the transformer 3. However, regarding a distance between the transformer 3 and the inverter 4, by considering an electrical potential difference to be applied to the transformer 3 and the inverter 4, the transformer 3 should be away from the inverter 4 by an amount of necessary insulation distance at least. Further, by disposing the transformer 3 which is heavy at a lower part of the housing 1, the center of mass of the housing 1 is brought lower, consequently, from a view point of vibration during transport and earthquake-proof designs, it is advantageous.
A power supply device for an ozone generator according to the present invention is a power supply device for applying electric power to an ozone generator by silent discharge. Regarding an ozone generator by silent discharge, a load of a power supply is capacitive load, and generally, a reactor is provided at an output side of the power supply. The reactor 5 is attached on a reactor attaching plate 16 which is disposed above the transformer 3 and the inverter 4, and cooling is performed with cooling air after the transformer 3 and the inverter 4 are cooled. At a part which is a lower part of the reactor of the reactor attaching plate 16, an opening is formed so as for cooling air to flow. Though a temperature of cooling air which is flown to the reactor 5 increases, cooling can be performed by using all of cooling air which flows the housing 1, therefore the reactor can be sufficiently cooled. Further, in a case where the reactor 5 is sufficiently cooled, by making a size of the reactor attaching plate 16 small or by forming an opening at a part in addition to a part which is a lower part of the reactor, an amount of cooling air which is flown in the reactor 5 can be controlled. In this case, pressure loss of cooling air is decreased, therefore, the number of fan 7 can be decreased or a fan having lower capacity can be used, as a result, electric power and cost for cooling can be suppressed.
Here, an air-core coil reactor can be used as the reactor 5. In this case, an air-core part of the air-core coil is used as an air passage, therefore cooling of the reactor 5 can be efficiently performed. Further, by adapting an air-core coil reactor, weight is lowered, as a result, the configuration of housing can be simplified, from a view point of vibration during transport and earthquake-proof designs, the configuration can be advantageous.
The fan 7 is disposed at a position which is inside of a front door 11. The fan 7 is a part which requires maintenance, only by opening the front door 11, maintenance can be performed, consequently, operation efficiency during maintenance can be significantly increased. Conventionally, a fan is disposed at an upper part or a lower part or back of the housing, therefore, it is necessary to open a panel which is dedicated to maintenance or operation using a stepladder or operation which is performed by crouching may be necessary. By disposing the fan 7 at a position which is inside of the front door 11, workability can be significantly improved in comparison with that of conventional devices. Further, a protection panel 9 which is grounded is disposed between the fan 7 and the inverter 4 to which high voltage is applied, therefore, the configuration is safe, that is, the inverter 4 will not be touched by mistake when the fan 7 is replaced. Consequently, operator's emotional burden can be greatly reduced, as a result, more accurate and rapid operation can be performed. As above mentioned, special technique when a fan is replaced is not required, therefore, when malfunction occurs, user can replace fans rapidly by himself.
The air passage 8 is configured by the protection panel 9 for isolating the inverter 4 to which high voltage is applied and the front door 11 of the housing 1, and does not have a structural component which is dedicated to an air passage. By sharing structural components, miniaturization, simplification and reduction of cost of the housing 1 can be realized. Further, by providing the air passage 8 at a side of front of the housing 1, further as shown in
As shown in
As shown in a top view of
As the heat exchanger 2 is disposed at a lower part of the housing 1, a cooling water pipe 6 for introducing cooling water to the heat exchanger 2 can be shorten in comparison with a case where the heat exchanger 2 is disposed at the center or an upper part of the housing 1, therefore, there is no waste of piping material, and a distance where cooling water flows is decreased, as a result, pressure loss can be decreased. Further, in a case where the heat exchanger 2 is disposed in the center or at an upper part of the housing 1, protection material such as a dedicated pan or a tray is necessary so as not for an electric part of the housing 1 to be gotten water due to water leak mainly from a copper pipe hair pin part or condensation. Inside the housing 1, high voltage equipment such as the transformer 3, the inverter 4, the reactor 5, etc. is disposed, therefore, between a protection material and high voltage equipment, insulation distance should be provided, as a result, a size of the housing 1 is made to be large. As the heat exchanger 2 is disposed at a lower part of the housing 1 and the air passage partition plate 10 is provided, therefore, even when water leaks from a hair pin part of the copper pipe 1 and water blows out, the air passage partition plate 10 functions to guard the transformer 3 and the inverter 4 to be prevented from being gotten water. Condensation of water drop trickles along the heat exchanger 2 which is disposed diagonally and drips from the lowest edge of the heat exchanger 2, therefore, there is no worry such that an electric part will be gotten water and malfunction of device will be occurred. Further, for water wet measures for electric parts, a dedicated approach is not intended, therefore, the number of part to be used is not increased, as a result, a device which is small-sized and simple and has reliable configuration can be realized.
Cooling water is flown in the copper pipe 2e of the heat exchanger 2, however, in many cases, pressure loss of cooling water becomes problems. When pressure loss of cooling water becomes large, it is necessary to increase pump capacity for flowing cooling water, therefore electric power to be used and cost is increased. It is configured such that the copper pipe 2e of the heat exchange 2 has headers 2a, in accordance with calorific value which is generated in the housing 1, the number of copper pipe 2e can be increased or decreased in parallel (in the configuration shown in
As shown in
As above mentioned, regarding a power supply device for an ozone generator according to Embodiment 1, a transformer, a reactor and an inverter are disposed in the same housing, the space between the protection panel 9 which isolates high voltage and the front door 11 is made to be an air passage, and a fan is provided at a position which is inside of a front door so as to circulate cooling air whose heat is exchanged by the heat exchanger in the housing. Consequently, a power supply device for an ozone generator in which maintenance operation of fan is easy and a size of the housing can be small-sized can be obtained.
In Embodiment 1, cooling configuration which is dedicated to the transformer 3 is not provided, however, the configuration of the transformer 3 is especially complicated, therefore, when cooling air is aggressively flown inside the transformer 3, the efficiency is more excellent in comparison with when cooling air is flown only outer surface. Consequently, in Embodiment 2, as shown in FIGS. 8 to 11, a cooling air guide 31 which aggressively cools the transformer 3 is provided at a lower part of the cooling air guide 31. A cooling air guide 31 shown in
In Embodiment 3, a designated fan for cooling transformer which flows cooling air directly toward a transformer so as to forcibly cool the transformer 3 is provided in a power supply device for an ozone generator having the same configuration as that of a power supply device for an ozone generator in Embodiment 1, and the fans are disposed at a front side and a back side of the transformer 3. Regarding a fan, an axial flow fan, a line flow fan, etc. can be used, and if necessary, the fan12 for cooling a transformer at front side or the fan 13 for cooling a transformer at back side can be omitted, as a result, cooling capacity can be voluntarily adjusted.
A commercial AC power supply 60, via a switch 70, is connected to each of transformers 3a, 3b, 3c and 3d of each of power supply devices 20a, 20b, 20c and 20d for an ozone generator. Each of the transformer 3a, 3b, 3c and 3d transforms voltage from the commercial AC power supply. AC voltage which is transformed by the transformer is converted by inverters 4a, 4b, 4c and 4d to be AC voltage having frequency which is higher than that of the commercial AC power supply, the converted AC power voltage is outputted via reactors 5a, 5b, 5c and 5d and the outputted power is combined so as to supply electric power to the ozone generator 50. Consequently, the transformers 3a, 3b, 3c and 3d of each of the power supply devices 20a, 20b, 20c and 20d for an ozone generator has smaller electric power capacity than electric power which is supplied to whole of the ozone generator. It is needless to say such that other equipment of each of the power supply devices 20a, 20b, 20c and 20d for an ozone generator has smaller electric power than electric power which is supplied to whole of the ozone generator. The reactors 5a, 5b, 5c and 5d can be made to be reactors having a small value in comparison with a case in which one reactor is used for whole of the ozone generator without unifying in order to make appropriate value for unified electric power. Consequently, the above mentioned reactor having an air-core can be effectively used.
In
As above mentioned, in a power supply device for an ozone generator of one unit in an ozone generator according to Embodiment 4, power capacity of equipment including a transformer is smaller than electric power which is supplied to whole of the ozone generator, and by using the power supply device alone, electric power for whole of the ozone generator can not be sufficiently supplied. By using an appropriate number of the power supply devices for an ozone generator in accordance with the electric capacity of the ozone generator so as to configure a power supply for an ozone generator to supply the electric power to whole of the ozone generator, it is not necessary to dispose equipment of power supply device, perform connecting, cooling designing per capacity of ozone generator, therefore, time and cost for spending for designing and verifying can be reduced.
Further, cooling air in a unit is circulated from front side to a lower part, back side and front side, therefore when a plurality of units are connected in parallel, even by taking away partition walls between adjacent units, flow of cooling air will not be affected. Consequently, partition walls between adjacent units can be taken away, therefore price of device can be reduced.
Further, present invention may be made without departing from the scope thereof, by combining embodiments, appropriately changing or omitting.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2016/073400 | 8/9/2016 | WO | 00 |
