JP2008248763A - Water injected compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reproduction of germs in a separator, a compressor and pipe without spending labor such as water replacement during interval until next operation even if the compressor is stopped for a long period of time. <P>SOLUTION: A water-injected compressor, which injects water inside a separator 3 into the compressor 1 and discharges the water along with compressed air into the separator, is provided with a water injection pipe 22 injecting water retained by the separator 3 to the compressor 1 via a water supply pipe 20 and a cooling water cooler 4, a pump 29 provided between the water supply pipe 20 and the cooling water cooler 4, a delivery pipe 15 delivering compressed air and water injected to the compressor 1 to the separator 3, and a delivery air pipe 16 delivering compressed air having water separated from the separator 3. When predetermined time elapses after stop of the compressor 1, the compressor 1 is driven with controlling displacement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water-injection compressor that injects water in a separator (water tank) into a compressor, discharges it into the separator together with compressed air, and separates it, and in particular prevents deterioration of circulating water and performs safety management of water quality. Suitable for energy saving.

  Conventionally, in order to reduce the impurity concentration of circulating water and operate continuously for a long time without replenishing water, compressed air is supplied to the water tank, the compressed air that has exited the water tank is cooled, and the separated moisture is stored in the compressor. It is known that the excess circulating water is discharged from the water tank, and is described in Patent Document 1, for example.

JP 2000-45948 A

  In the above-described prior art, when condensed water is always supplied from the compressed air while the compressor is operating, high pressure and high temperature are generated in the compressor, so that the growth of bacillus is suppressed. However, if the compressor is stopped for a long time, the water in the separator and the piping approaches the atmospheric temperature, and there is a risk that the bacilli in the air propagate in the water remaining in the separator and the piping.

  In particular, the environment where the atmospheric temperature is around 30 ° C from spring to autumn is suitable for the growth of Aspergillus. Therefore, in order to suppress the growth of Aspergillus oryzae when the stop time is long, frequent water exchange and further the equipment and piping Cleaning is necessary.

  The object of the present invention is to prevent the bacterium from growing in the separator, the compressor and the piping without taking the trouble of water exchange until the next operation even if the compressor is stopped for a long time. It is in. Furthermore, it is to save energy as much as possible for water quality management.

  In order to achieve the above object, the present invention is a water-injection compressor that injects water in a separator into a compressor, discharges water together with compressed air into the separator, and separates the water. Water injection piping that injects water into the compressor via a water supply piping, a pump, and a water cooler, discharge piping that discharges compressed air and water injected into the compressor to the separator, and water from the separator And a discharge air pipe for discharging the separated compressed air, and when the preset time has elapsed after the compressor is stopped, the compressor is operated while controlling its capacity.

  According to the present invention, when the compressor is not started even after a preset time has elapsed, the compressor is operated with capacity control, so that the bacterium is not propagated in the compressor and the piping, and power is saved. Can be achieved.

  FIG. 1 shows a system configuration of an embodiment, and a water jet compressor 1 is a positive displacement compressor, and a screw compressor will be described as an example.

  The water in the separator 3 is supplied from the water supply pipe 20 by the internal pressure of the separator, cooled by the air-cooled water cooler 4, and then supplied from the water injection pipe 22 to the rotor working chamber of the compressor 1. When a water-lubricated bearing is adopted as the bearing, since there is no pressure in the separator when starting from a stopped state, the pressure is increased by a pump 29 provided between the water supply pipe 20 and the air-cooled water cooler 4. To supply water.

  The compressor 1 compresses the air sucked from the suction port 14 provided with a suction filter, and discharges it to the separator 3 from the discharge port through the discharge pipe 15 together with water jetted in the compression process. In the separator 3, compressed air and water are separated, and the water is stored in the lower part of the separator 3 and then supplied again from the water supply pipe 20 to the compressor 1.

  After the compressed air is separated by the separator 3, the compressed air is cooled by the aftercooler 5 through the upper discharge air pipe 16, the drain condensed by the drain separator 19 is removed, and the compressed air is discharged to the in-situ line 18.

  When the water injection compressor 1 is stopped for a relatively long time such as at night or on holidays, the water injection compressor 1 is automatically operated for water quality management when the stop time exceeds a preset stop time toff23 as shown in FIG. , Drive for the set time ton24. Thereafter, the stoppage and operation are repeated until the water injection compressor is restarted. The operation and stop of the compressor will be further described with reference to FIG.

  The water injection compressor 1 includes a control panel 9 that controls the operation of the entire unit, and drives the drive motor 2 of the water injection compressor 1, the motor 6 for the cooling fan, and the motor of the pump 29. In addition, a three-way solenoid that switches between a bypass piping solenoid valve 45 of the booster pump 29 at the time of start-up, a piping that cools water for water supply through the air-cooled water cooler 4, and a piping that keeps the water temperature at a high temperature without cooling. The valve 21 is driven.

  The temperature of each part is detected by an atmospheric temperature (intake temperature) detection sensor 13, a separator water temperature detection sensor 11, and a discharge temperature detection sensor 12 provided at the suction port 14. Further, the operation time and stop time of the compressor are detected by the timer 10. As shown in FIG. 3, the control panel 9 has a storage device that stores data in which an operation time and a stop time are set according to the detected atmospheric (intake) temperature.

  Next, the operation procedure of the water jet compressor will be described with reference to FIG.

  On a daily basis, the compressor is started 31 for normal operation. When the operation time of the day is over, the compressor is stopped 32. Thereafter, the compressor detects the stop time to by a timer 33 and stores it. Further, the atmospheric temperature (intake temperature) Ta and the water temperature Tw of the separator are detected 34 and stored in the same manner. Therefore, based on the detected atmospheric temperature Ta or water temperature Tw, the compressor downtime toff and the operating time ton are set 35 with respect to the atmospheric temperature Ta or the water temperature Tw from the data in the storage device. Thereafter, the elapsed time t1 is detected 36 by a timer, and a pause time is calculated 37. If the pause time exceeds the set time 38, the water injection compressor is operated 39.

  When the pause time does not exceed the set time, the loop after the detection 34 of the air (intake) temperature and the water temperature is repeated. When the compressor is operating, the operating time t2 is detected 40 and stored. Next, the elapsed time t3 is detected 41, and the operation time is calculated 47. Therefore, the calculated operation time is compared 42 with the set operation time ton, and when the operation time exceeds the set time ton, the compressor is stopped 43.

  Thereafter, after determining 44 whether or not the normal start switch has been pressed on the compressor, if the normal start switch is pressed, the normal continuous operation 31 is performed. If the normal start switch is not pressed, the operation for water quality management is repeated.

  In addition, when the compressor for water quality management is operated after the compressor is stopped, the discharge air temperature is preferably raised from the normal operation in order to increase the sterilizing effect of water. That is, the water to be supplied is usually cooled and supplied by the air-cooled water cooler 4 shown in FIG. 1, but for example, the three-way solenoid valve 21 is switched to supply water directly to the water injection compressor without passing through the water cooler. To do. As a result, the temperature of the water also rises to a high temperature, so that the water sterilization effect increases. Furthermore, when the discharge air temperature (the temperature of the water at the time of discharge is close) is 85 ° C. or more and the operation time at this temperature is 15 minutes or more, the sterilization effect of water is ensured.

  In addition, the discharge air temperature (water temperature) is set by operating the three-way solenoid valve 21 and controlling the passage and bypass of the water cooler so that the discharge air temperature does not become excessively high after the discharge air temperature reaches the set temperature. It is desirable to adjust the cooling of water by adjusting the temperature or by controlling the rotational speed of the motor 6 that drives the cooling fan 7 of the air-cooled water cooler 4 to change the air volume.

  FIG. 6 shows the cooling of water by a water-cooled water cooler. The water in the separator 3 is supplied from the water supply pipe 20 by the internal pressure of the separator and cooled by the water-cooled water cooler 27. And supplied to the rotor working chamber of the compressor 1.

  When a water-lubricated bearing is adopted as the bearing, since there is no pressure in the separator when starting from a stopped state, the pressure is increased by a pump 29 provided between the water supply pipe 20 and the water-cooled water cooler 27 to the bearing of the compressor. Supply water. The compressor 1 compresses the air sucked from the suction port 14 provided with a suction filter, and discharges it to the separator 3 from the discharge port through the discharge pipe 15 together with water jetted in the compression process. The separator 3 separates compressed air and water, and the water is stored in the lower part of the separator 3 and then supplied again from the water supply pipe 20 to the compressor.

  The compressed air is separated by the separator 3, then cooled by the aftercooler 28 through the upper discharge air pipe 16, the drain condensed by the drain separator 19 is removed, and then discharged to the in-situ line 18.

  When the water injection compressor 1 is stopped for a relatively long time such as at night or on holidays, the water injection compressor 1 is automatically operated for water quality management after a stop time toff23 set in advance as shown in FIG. Operates for set time ton24. Thereafter, the stoppage and operation are repeated until the water injection compressor is restarted.

  The operation and stop of the compressor will be further described with reference to FIG. The water injection compressor is provided with a control panel 9 that controls the operation of the entire unit, and drives the drive motor 2 of the water injection compressor and the motor of the pump 29. In addition, the solenoid valve 45 for the bypass pipe of the booster pump 29 at the time of start-up, the pipe for cooling the water for supplying water through the water-cooled water cooler 27, and the three-way switching to the water injection pipe 22 for supplying the compressor 1 directly without cooling. The electromagnetic valve 21 is driven.

  Further, the temperature of each part is detected by an air (intake) temperature detection sensor 13, a separator water temperature detection sensor 11, and a discharge temperature detection sensor 12 provided at the suction port 14. Further, the operation time and stop time of the compressor are detected by the timer 10.

  Further, the control panel 9 has a storage device that stores data in which the operation time and the stop time are set according to the detected suction temperature as shown in FIG. Next, the operation procedure of the water jet compressor will be described with reference to FIG.

  On a daily basis, the compressor is started 31 for normal operation. The compressor is then stopped 32 when the day's operating time ends and the line stops. Thereafter, the compressor stores the stop time to by a timer 33, and further detects and stores the atmospheric temperature (intake air temperature) Ta and the water temperature of the separator Tw. Therefore, based on the detected atmospheric temperature Ta or water temperature, the compressor downtime toff and operating time ton for the atmospheric temperature Ta or the water temperature Tw are set from the data in the storage device. Thereafter, the elapsed time is detected by a timer, and when the pause time exceeds the set time, the water jet compressor 1 is operated.

  Furthermore, the operating time is detected, and the elapsed time is detected periodically thereafter. When the operating time exceeds the set time ton, the compressor is stopped. At that time, after determining whether or not the normal start switch has been pressed on the compressor, if the normal start switch is pressed, the normal continuous operation 31 is performed. If the normal start switch is not pressed, the operation for water quality management is repeated. The discharge air temperature is adjusted by adjusting the amount of cooling water in the water-cooled water cooler 27 with the electromagnetic valve 46.

  The casing, rotor, bearing, and shaft seal device have heat resistance that can be used at the set discharge temperature so that the compressor will not be disturbed even if the discharge temperature becomes high. In addition, the clearance between the rotor, between the rotor casing and the inner and outer rings of the bearing ensures values that do not cause damage when operating at the set discharge temperature. In addition, heat resistance is secured so that piping, separators, packings, solenoid valves, and temperature detection sensors can be operated at a set discharge temperature.

  As described above, after the water injection compressor is stopped, if the compressor is not started even after the preset time, that is, the time when the propagation of the koji mold starts to be active, the compressor is periodically operated and stopped. Since the water does not stay in the separator, the water pipe, and the compressor for a long time and the water temperature becomes higher, it is possible to prevent the koji mold from propagating in the water in the separator or in the apparatus.

  In addition, the air temperature or separator water temperature is detected, and the time and interval for operating the water jet compressor are set according to the air temperature or water temperature. Breeding can be prevented.

  Furthermore, when the atmospheric temperature is low, such as in winter, when the gonococcal breeding is not active, the driving energy of the compressor required for water quality management can be saved by extending the interval at which the water jet compressor is operated.

  Furthermore, when operating the water jet compressor for the purpose of water quality management, the water temperature also approaches the discharge temperature by making the discharge air temperature of the compressor higher than the set temperature during normal operation. The effect can be increased. In addition, the sterilization effect of water can be ensured by operating the discharge air temperature at the time of operating a water-injection compressor for water quality management at 85 degreeC or more for 15 minutes or more.

  In addition, the heat-injection compressor, separator, and piping have a heat-resistant structure that can be operated at a high set discharge air temperature, and by setting the clearance appropriately, the main components such as bearings, rotors, and casings are thermally expanded. Or, it can be altered to prevent damage such as deformation and contact, and deterioration of compression performance and function such as leakage.

  Furthermore, by performing capacity control by the capacity control mechanism shown in FIG. 7 and operating the compressor, it is possible to save energy when water is preserved. For example, by reducing the suction unloader 48 provided at the suction port of the compressor, the intake air can be reduced and the driving power of the compressor can be reduced.

  Further, the driving power of the compressor can be further reduced by driving the motor 2 that drives the compressor while the rotation is reduced by the inverter 49.

  Furthermore, the reverse osmosis membrane purified water production apparatus 50 is provided from FIG. 8, the compressor is operated for sterilization, the water in the separator is discarded, and the water produced by the reverse osmosis membrane purified water production apparatus 50 is replenished. As a result, the operation time of the compressor can be saved and an energy saving effect can be obtained.

  Further, by providing an ultraviolet sterilizer 55 in the water supply pipe 20 shown in FIG. 9 and sterilizing water with ultraviolet rays, the operation time of the compressor can be similarly saved and an energy saving effect can be obtained.

The block diagram which shows one embodiment by this invention. The graph which shows the relationship between the stop of one Embodiment, an operation time, and discharge air temperature. The figure which shows the relationship between the atmospheric temperature of one embodiment, a stop, and operation time. The flowchart which shows the driving | operation operation | movement of one Embodiment. The graph which shows the relationship between stop and operation time, and discharge air temperature. The block diagram which shows the system configuration | structure of other embodiment. The block diagram which shows the system configuration | structure of other embodiment. The block diagram which shows the form of other water quality management. Furthermore, the block diagram which shows the other water quality management form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Compressor drive motor 3 Separator 4 Air-cooled water cooler 7 Cooling fan 9 Control panel 11 Water temperature detection sensor 12 Discharge temperature detection sensor 13 Air temperature detection sensor 15 Discharge piping 16 Discharge air piping 20 Water supply piping 21 Three-way solenoid valve 22 Water injection pipe 27 Water-cooled water cooler 29 Pump 46 Water volume adjustment solenoid valve 48 Suction unloader 49 Inverter 50 Reverse osmosis membrane purified water production device 51 Water supply pipe 52 Supply water pipe 53 Drain pipe (1)
54 Drainage pipe 55 UV sterilizer 56 Power supply 57 UV lamp

Claims (5)

In the water injection compressor for injecting water in the separator into the compressor, discharging water into the separator together with compressed air, and separating the water,
A water injection pipe for injecting water held in the separator to the compressor via a water supply pipe, a pump and a water cooler;
A discharge pipe for discharging compressed air and water sprayed to the compressor to the separator;
A discharge air pipe for discharging compressed air from which water is separated from the separator;
A water-injection compressor characterized in that, when a preset time has elapsed after the compressor is stopped, the compressor is operated while controlling its capacity.   2. The water injection compressor according to claim 1, wherein a suction unloader (throttle mechanism) provided at the suction port is provided to vary the amount of intake air.   2. A water-injection compressor according to claim 1, further comprising an inverter that drives the drive motor of the compressor at a variable speed.   2. The apparatus according to claim 1, wherein a drain pipe, a reverse osmosis membrane filter water purifier, and a makeup water pipe capable of supplying water to the separator are provided at a lower part of the tank of the separator, and after the compressor is stopped. The water jet compressor is characterized in that when a preset time has elapsed, the water in the separator is discharged and purified water is added.   The water jet compressor according to claim 1, wherein an ultraviolet sterilizer is provided in the water supply pipe.

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