JP2012007806A - Dry air supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a margin of a supply capacity is required in a dry air supply system that can respond to the amount of dry air needed steadily as well as a suddenly needed increased or decreased amount of air.SOLUTION: There is provided a dry air supply system, including: a supply chamber for communicating a plurality of outlets of dehumidifiers with an air blowing pipe which blows dry air; an outside air introducing chamber for communicating a plurality of inlets of dehumidifiers with an outside air intake opening; a bypass air blowing passage for communicating the supply chamber with the outside air introducing chamber; a pressure gauge disposed on the supply chamber side in the bypass air blowing passage and outputting a measured value; a bypass damper disposed on the outside air introducing chamber side than the pressure gauge in the bypass air blowing passage and controlling opening/closing; and a control unit for receiving a pressure signal from the pressure gauge and individually controlling the bypass damper and the plurality of dehumidifiers on the basis of the pressure signal.

Description

  The present invention relates to a supply system for dry air supplied to a factory or the like.

  In recent years, electronic parts such as liquid crystal panels, plasma display panels, and batteries are manufactured through very fine manufacturing processes such as manufacturing semiconductors in the products themselves, and manufacturing the main parts of the products themselves with 1 mm or less. . Along with this, it is necessary to prevent cross contamination from moisture and contaminants in the air, which has heretofore been only noticed in the semiconductor manufacturing process.

  Thus, dry air having a low moisture concentration is supplied into the factory, and manufacturing and parts are transported in a low humidity environment. According to Patent Document 1, with respect to the supply of dry air into the factory, filling the entire factory with dry air requires enormous energy. Therefore, dry air is locally applied only to the required area. A delivery system is disclosed.

  However, there is only disclosure that a desiccant dehumidifier is used as the supply source of dry air. Generally, since these factory facilities occupy a huge space, it is impossible to supply dry air required by one dehumidifier. Therefore, regarding the supply of dry air, how to arrange and operate a plurality of dehumidifiers becomes a problem as a dry air supply system.

  As dry air supply systems using a plurality of dehumidifiers, technologies such as Patent Documents 2 and 3 are disclosed. These relate to a system for supplying dry air to storage bins used for storing crops.

  In Patent Document 2, a plurality of dehumidifiers are only controlled to be turned on or off, whereas in Patent Document 3, the operation of the dehumidifiers is changed in multiple stages to supply dry air that is estimated to be necessary. Fine control.

  FIG. 5 shows a dry air supply system 100 according to Patent Document 3, which will be outlined. A plurality of storage bins 110 are arranged, in which grains and the like are stored. The dry air supply system includes a main and sub dehumidifiers (112, 113), a blower (114, 115), an air duct 118 to each storage bin, and an air damper (120a, 120b, 120c) arranged at the bottom of the storage bin. ), A hydrostatic pressure gauge 122 disposed at the end of the air duct, a moisture meter and a meter (not shown) for observing the amount of grain and the amount of moisture stored in the storage bottle.

  In the dry air supply system 100, a target value obtained by adjusting the two dehumidifiers in a multistage manner is obtained by a predetermined calculation from the amount of grain stored in each storage bin 110 and the amount of moisture. And the output of the compressor which drives these dehumidifiers is controlled in multistage. The multi-stage control method is a three-stage operation capability (100, 60, 0) of each dehumidifier, while the combination shown in FIG. 6 is executed.

JP 2009-162404 A Japanese Utility Model Publication No. 03-057394 JP 05-079764 A

  In the dry air supply system, it is necessary to have a sufficient supply capacity so that the amount of dry air that is regularly required and the required amount suddenly increase or decrease can be accommodated. Become. This is because, especially in factories, changes such as the entry / exit of parts, materials and products, or the introduction of equipment occur, and the dry air supply system must always supply dry air as desired. In addition, even if any dehumidifier fails, it is necessary to be able to supply dry air.

  In this regard, the technique disclosed in Patent Document 1 assumes that there is sufficient supply of dry air, and the adjustment of the supply amount to each local area is only performed by a damper of the supply pipe.

  In addition, in the case of Patent Documents 2 and 3, although the correspondence of changing the operation method between the dehumidifiers with respect to the required amount has been made, how is the difference in supply capacity when the dehumidifiers change in multiple stages? It is not disclosed whether to handle it. For this reason, when supplying a required amount of dry air that is slightly higher than a certain operation state, the operation is performed in the next higher operation state, and excess dry air is discarded.

  In addition, as a dehumidifier that can be operated with low power consumption, a desiccant type dehumidifier that adsorbs moisture etc. with an adsorption rotor, desorbs moisture in the same device, and operates cyclically in recent years has been used. However, in the case of a desiccant type dehumidifier, it is necessary to replace the rotor at regular intervals.

  And since the dry air supply system utilized in a factory etc. is a big system, it is more efficient to exchange these rotors at once. That is, it is desirable that a plurality of dehumidifiers be deteriorated in the same manner. In the operation method in which only one dehumidifier is operated for a long time or the operation time of only one dehumidifier is short, the operation is as viewed from the whole system. There was a problem that the cost would be high.

  The present invention has been conceived in view of the above-described problems, and provides a dry air supply system capable of reducing power consumption and maintenance cost as much as possible as the entire system.

Specifically, the dry air supply system of the present invention is:
A supply chamber in which an output port of a plurality of dehumidifiers and a blower pipe for sending dry air are communicated;
An outside air introduction chamber in which an input port and an outside air intake port of the plurality of dehumidifiers are communicated;
A bypass air passage communicating the supply chamber and the outside air introduction chamber;
A pressure gauge that is arranged on the supply chamber side in the bypass air passage and outputs a measurement value;
A bypass damper disposed on the outside air introduction chamber side from the pressure gauge in the bypass air passage and controlled to be opened and closed;
The apparatus includes a control unit that receives a pressure signal from the pressure gauge and individually controls the bypass damper and the plurality of dehumidifiers based on the pressure signal.

The dry air supply system of the present invention is
The said control part has the information of at least each operation time of these dehumidifiers, It is characterized by the above-mentioned.

The dry air supply system of the present invention is
When the plurality of dehumidifiers are decelerated, the control unit decelerates from the dehumidifier having the largest operating load among the plurality of dehumidifiers.

The dry air supply system of the present invention is
When the speed of the plurality of dehumidifiers is increased, the control unit increases the speed from a dehumidifier having a low operating load among the plurality of dehumidifiers.

The dry air supply system of the present invention is
The plurality of dehumidifiers are controlled so that the output port and the input port can be opened and closed,
The control unit closes at least the output port of the dehumidifier for a predetermined time when changing the operating state of the dehumidifier.

The dry air supply system of the present invention is
Each of the plurality of dehumidifiers outputs a status signal regarding its own state,
The control unit receives status signals from the plurality of dehumidifiers, and speeds up the operation of the other dehumidifiers when any of the dehumidifiers has failed.

  The dry air supply system of the present invention includes a supply chamber in which the output ports of a plurality of dehumidifiers are communicated, and an outside air introduction chamber in which the input ports of these dehumidifiers are in communication, and these chambers communicate with each other by a bypass air passage. Since the bypass damper in the bypass air passage opens and closes, the pressure in the supply damper is set within a predetermined range, so that supply according to the amount of dry air required is possible. That is, it is possible to provide a margin for the supply capacity of dry air.

  In addition, since the control unit has information on the operating time of each dehumidifier, when lowering the operation of the dehumidifier, lowering it from the dehumidifier with the highest operating load based on the operating time, and increasing the operation, Can be raised from the least dehumidifier. As a result, the use of the respective dehumidifiers is made uniform, so that the plurality of dehumidifiers are almost uniformly deteriorated, and the system can be restored by maintenance once. This has an effect that the maintenance cost can be lowered particularly in the case of a desiccant type dehumidifier using an adsorbent.

  In addition, when changing the operating state of the dehumidifier, only the dehumidifier is operated independently for a predetermined time, and dry air is output to the supply chamber after reaching a steady state. It has an effect that the humidity of the air does not change before and after the change of the operating state.

  Also, if any of the dehumidifiers breaks down, the operating state of all the remaining dehumidifiers is raised, so that even if one dehumidifier breaks down, the supply of dry air can be continued. .

Conceptual diagram of the dry air supply system of the present invention The figure which shows one example of a structure of the dehumidifier used for the system of this invention Flow chart showing air volume adjustment processing of the system of the present invention The flowchart which shows the whole process of the system of this invention The figure which shows the structure of the dry air supply system which has several conventional dehumidifiers The figure which shows the driving | running state of a dehumidifier in the system of FIG.

  FIG. 1 shows a configuration of a dry air supply system 1 of the present invention. In addition, below, although the case where there exist two or more about the same component is demonstrated, the number of components is not limited to the number of the following description.

  The present dry air supply system 1 is assumed to have a plurality of dry air supply destinations ("drying chamber 30" described later). The present dry air supply system 1 includes a plurality of dehumidifiers (11a to 11e), a supply chamber 15 in which output ports (13a to 13e) of each dehumidifier 11 are communicated, and input ports (12a to 12a to 12) of the dehumidifiers 11. 12e) and the outside air intake chambers (25a to 25e) communicated with each other, and a bypass air passage 16 that connects the supply chamber 15 and the outside air introduction chamber 17 with each other. In addition, although each dehumidifier 11 is shown by FIG. 2, it is comprised by the three-way valve for making the output port 13 and the input port 12 connect, and carrying out a circulating operation.

  A bypass damper 21 and a pressure gauge 20 disposed on the supply chamber 15 side from the bypass damper 21 are disposed in the bypass air passage 16.

  Moreover, it has the control part 10 which controls the dry air supply system 1 whole. The control unit 10 is connected to at least the pressure gauge 20, the bypass damper 21, and each dehumidifier (11a to 11e: reference numeral 11 is used when representatively referred to). Connected to the output port (13a to 13e: symbol 13 is used when representative) and the input port (12a to 12e: symbol 12 is used when representative) of each dehumidifier 11. May be. Note that “connected” here means that signals can be exchanged with each connected device. In addition, being connected to the bypass damper 21, the output port 13, and the input port 12 means that the drive motor that controls the opening and closing of each can be controlled.

  Between the supply chamber 15 and a drying chamber (30a to 30d: where 30 is representatively used, reference numeral 30 is used as a representative) to which dry air is sent, a blower pipe (24a to 24d: when representatively referred to) Are communicated with each other using a reference numeral 24). Each drying chamber 30 has an air volume adjustment damper (31a to 31d: reference numeral 31 is used as a representative) in the middle of the air duct 24. Each air volume adjustment damper 31 can be controlled from each drying chamber 30.

  Next, each component will be described in more detail. The dehumidifier 11 is not particularly limited, such as a type that uses a cooler, a type that uses a chiller system, or a type that uses a plurality of adsorbing elements in a batch system. However, the adsorbing elements are rolled in the sense of power saving. A desiccant dehumidifier using a dehumidifying rotor formed in the above can be suitably used. In particular, this type of dehumidifier can exhibit high efficiency in the dry air supply system 1 of the present invention.

  FIG. 2 shows a schematic configuration of the desiccant type dehumidifier 11. Any dehumidifier 11 shown in FIG. 1 has the same configuration. The dehumidifier 11 includes at least a dehumidification rotor 40, a blower fan 42 that takes in air from the outside air, a blower fan 44 that takes in air from the outside air or the air blowing destination, and a heater 47. In addition, this type of dehumidifier 11 may include not only a dehumidifying rotor 40 that adsorbs moisture but also a degassing rotor 41 that also adsorbs organic components. In FIG. 2, the dehumidifier 11 which has arrange | positioned the degassing rotor 41 is shown. Further, since the gas removal rotor 41 is arranged, a drawing in which a blower fan 43, a heater 46, and a blower fan 45 are further added is shown.

  The output port 13 and the input port 12 are arranged with a three-way valve that allows the dry air to flow in the direction of communicating with the supply chamber 15 and the outside air introduction chamber 17 or returning the output dry air to the input port 12. Has been. The output port 13 and the input port 12 are communicated with each other by a return pipe 14, and the dry air to be output can be reentered into the dehumidifier 11 from the input port 12. The control of the three-way valve is performed by a control signal Ch from the control unit 10.

  An outline of the operation of the dehumidifier 11 will be described. In the dehumidifier 11, the dehumidification rotor 40 is rotated in the arrow direction by a motor (not shown) around the axis 50. The blower fan 42 sucks the outside air 60 containing moisture and passes the dehumidifying rotor 40. In the dehumidifying rotor 40, the adsorbent adsorbs moisture in the air and outputs dry air 61. The dry air 61 is further pressurized by the blower fan 43 and passed through the gas removal rotor 41. Similarly to the dehumidifying rotor 40, the degassing rotor 41 is also rotated by a motor (not shown).

  The degassing rotor 41 carries an adsorbent that adsorbs organic substances, metal ions, and the like, removes these substances from the dry air 61, and outputs dry purified air 62.

  In the dehumidifier 11, moisture and other substances are removed by the rotor carrying the adsorbent, so that the adsorption capacity cannot be maintained unless the substance adsorbed from the adsorbent is desorbed. Therefore, the dry purified air 62 (collectively referred to as “regeneration gas 65”) output to the outside air 60 or the output port 13 is sucked, and these are used as desorption gas to regenerate the adsorbent on each roll.

  Specifically, the regenerated gas 65 that has been sucked is heated by the heater 46 to produce warm air, and then passed through the gas removal rotor 41. The warm air releases organic matter, metal ions, and the like in the gas removal rotor 41. The regeneration gas 66 containing organic matter, metal ions, and the like that has come out of the degassing rotor 41 is pressurized by the blower fan 44, heated again by the heater 47, and passed through the dehumidifying rotor 40. The regenerated gas 66 that has been warmed again desorbs moisture from the dehumidifying rotor 40 and becomes a regenerated gas 67 that includes even moisture. The regeneration gas 67 is discharged out of the dehumidifier 11 by the blower fan 45.

  As described above, a desiccant-type dehumidifier removes moisture and other substances by passing air through a rotor carrying an adsorbent, and performs a regeneration operation for desorbing those substances from the adsorbent. Is going. Therefore, the operation must be performed while the adsorption / desorption operations are synchronized. If the balance is lost, sufficient dehumidification cannot be performed or efficient operation cannot be performed. In other words, this type of dehumidifier has a characteristic that it is difficult to continuously adjust the amount of dry air and cannot be stably operated unless it is in several stages.

  Needless to say, the dehumidifier 11 has power for operating the blower fan, the dehumidifying rotor 40, and the like. This power state is transmitted to the control unit 10 by the information signal Sh. Further, each dehumidifier 11 has its own control device, and may be configured to control these operating states and the input port 12 and output port 13 according to instructions from the control unit 10 of the system. Good.

  Returning to FIG. 1, the shape of the supply chamber 15 is particularly limited as long as the supply chamber 15 is a space of a predetermined capacity and is sealed except for a portion communicating with the dehumidifier 11, the blower pipe 24, and the outside air introduction chamber 17. It is not a thing. This is because any structure that does not allow air containing moisture or the like to enter from the outside may be used. However, preferably, the interference plate 22 or the like is disposed so as to face the output port 13 of the dehumidifier 11 so that the flow of the drying air from the dehumidifier 11 does not flow directly to the blower pipe 24 or the bypass air passage 16. It is good to be. This is because the air flow from the supply chamber 15 can be controlled by the internal pressure value.

  The outside air introduction chamber 17 is formed with an input port 12 to the dehumidifier 11 and an outside air intake port 25. The outside air introduction chamber 17 communicates with the bypass air passage 16 and is a sealed space having a predetermined volume. 15 and in common. Note that both the supply chamber 15 and the outside air introduction chamber 17 may have a leak valve that opens to the outside air at a predetermined pressure.

  The outside air intake port 25 is an opening for taking in outside air, and has a blower fan and an air filter. The outside air intake 25 is connected to the control unit 10, and the amount of outside air intake may be increased or decreased by control from the control unit 10.

  The bypass air passage 16 is a duct that allows the supply chamber 15 and the outside air introduction chamber 17 to communicate with each other, and is installed in the supply chamber 15 from the bypass damper 21 whose opening area is controlled by the control unit 10 on the way and the bypass damper 21. At least a pressure gauge 20 is included. The shape of the bypass air passage 16 is not particularly limited. However, it is preferable that the inner wall has no structural protrusion such as a flange so that air flows easily.

  The pressure gauge 20 arranged on the supply chamber 15 side of the bypass air passage 16 is not particularly limited as long as it is a type that can electronically output a measurement value. Further, the bypass damper 21 is provided with a driving device such as a motor capable of adjusting the opening diameter. The pressure gauge 20 and the bypass damper 21 are each connected to the control unit 10.

  The pressure gauge 20 measures at least the pressure in the bypass air passage 16 and transmits the value to the control unit 10 by the information signal Sp. Further, the drive device of the bypass damper 21 adjusts the opening area of the damper by the control signal Cd from the control unit 10. In the following description, if the bypass damper 21 receives the control signal Cd from the control unit 10, the description will be continued assuming that the opening area of the damper is adjusted.

  The control unit 10 may be a so-called PID control device, but a configuration including an MPU (Micro Processor Unit) equipped with control software, a memory, and peripheral devices can be suitably used. This is because, as shown below, complicated control of the dry air supply system 1 can be performed with a relatively small device. Here, a plurality of MPUs may be used. Only the control software may be on another computer.

  As described above, the control unit 10 is not only electrically connected to the pressure gauge 20 and the bypass damper 21 but also connected to each dehumidifier 11. In particular, signals are exchanged with each dehumidifier 11. A control signal Ch is sent from the control unit 10. The connection between each dehumidifier 11 may be a loop connection or a star connection. The control unit 10 can send the control signal Ch to each of the dehumidifiers 11, and can send the control signal Ch to all the dehumidifiers 11.

  Each dehumidifier 11 sends information such as the state of each dehumidifier 11 and the continuous operation time as an information signal Sh. The control signal Cd and the information signal Sh may include an open / close control signal and open / closed state information for the input port 12 and the output port 13 of each dehumidifier 11. That is, the control unit 10 can also detect whether the input port 12 and the output port 13 of each dehumidifier 11 are open. In the present specification, the description will be continued as such a configuration.

  The control signal Ch may include a control signal for opening and closing the three-way valve for taking in the dry air output from each dehumidifier 11 from the input port 12 again. In particular, when the dehumidifier 11 rises from the stopped state, the dehumidifier 11 rises quickly by circulating the inside of the dehumidifier 11 using the output dry air as it is as the input gas.

  Moreover, the control part 10 receives the instruction | indication Cc about the driving | operation of the whole system from the console which is not shown in figure. Further, the control unit 10 can output information on the entire system as a signal Ss based on the instruction Cc. The signal Ss can display the status of the entire system on a display device using liquid crystal or the like.

  Next, the operation of the dry air supply system 1 will be described. First, the outline of the operation of the dry air supply system 1 is as follows. The drying chamber 30 is a space partitioned for each process performed in a factory, for example. In each room, the air volume adjustment damper 31 is adjusted by a control panel (not shown) according to the status of work and maintenance, and the supply amount of dry air from the blower pipe 24 is adjusted. The used dry air is discharged from each drying chamber 30. Thus, when it sees from the supply chamber 15 side which sends dry air to the ventilation pipe | tube 24, it is unclear when and how much dry air is requested | required.

  Each dehumidifier 11 is designed so that the drying air predetermined by design can be blown to all the drying chambers 30 at 70% of the maximum output. In the steady state, dry air is discharged from the output port 13 of the dehumidifier 11 operating at 70% to the supply chamber 15. The dry air that has entered the supply chamber 15 raises the internal pressure in the supply chamber 15, and the dry air flows through the blower pipe 24.

  The pressure in the supply chamber 15 is notified to the control unit 10 by an information signal Sp output from the pressure gauge 20. When the control unit 10 recognizes that the inside of the supply chamber 15 becomes a predetermined pressure value or more, the control unit 10 outputs a control signal Cd for opening the bypass damper 21. By this control signal Cd, the bypass damper 21 is opened, and the dry air flows through the bypass air passage 16 and flows into the outside air introduction chamber 17. As a result, the pressure in the supply chamber 15 decreases.

  The outside air introduction chamber 17 takes in outside air from the outside air inlet 25. The dry air is mixed with the outside air and supplied again to the dehumidifier 11 from the input port 12. As a result, the humidity of the outside air is reduced by the amount mixed with the dry air, and the load on the dehumidifier 11 is reduced.

  The case where more dry air is needed on the drying chamber 30 side in this state will be described. For example, assume that the amount of dry air used in the drying chamber 30b has increased. Since the pressure in the supply chamber 15 decreases, the control unit 10 detects this and transmits a control signal Cd for closing the bypass damper 21. Thereby, the dry air sent to the outside air introduction chamber 17 side decreases, and the amount of dry air that can be sent to the drying chamber 30 increases. In addition, the load of each dehumidifier 11 becomes high because the quantity of the dry air sent to the external air introduction chamber 17 side decreases.

  Conversely, if the amount of dry air used on the drying chamber 30 side decreases, the pressure in the supply chamber 15 increases. When the control unit 10 knows that the pressure has increased by the information signal Sp from the pressure gauge 20 and determines that the pressure has exceeded a predetermined value, a control signal Cd for opening the bypass damper 21 is sent. When the bypass damper 21 is opened, the dry air in the supply chamber 15 flows into the outside air introduction chamber 17, and the pressure in the supply chamber 15 decreases. Note that when the amount of dry air flowing to the outside air introduction chamber 17 side increases, the load on each dehumidifier 11 decreases.

  As described above, in the dry air supply system 1 of the present invention, dehumidification is performed between the supply chamber 15 and the outside air introduction chamber 17 even if there is some variation in the amount of dry air used on the drying chamber 30 side. By exchanging dry air, there is a margin in supply.

  FIG. 3 shows the above flow. This process is a part of the process in the entire system to be described later, and adjusts the supply amount of dry air when the operating state of each dehumidifier 11 is not changed. When the process is started (S1100), the value of the pressure P in the supply chamber 15 is acquired by the information signal Sp from the pressure gauge 20 (S1102).

  If the pressure P is higher than the pressure value (denoted as “Thwu”) that should consider the speed increase of the operation of the dehumidifier 11 (Y branch in S1104), a speed increase flag is set (not shown). The process exits from this process and returns to the entire process flow (S1116). Otherwise, it is determined whether or not the damper is higher than a value that needs to be adjusted (described as “Thu”). If the pressure is higher than the threshold Thu (Y branch of S1106), the bypass damper 21 is opened ( S1108) This process is exited. Otherwise, this process is skipped (N branch of S1108).

  Next, when the pressure P in the supply chamber 15 is lower than the pressure (denoted as “Thwd”) that needs to be taken into consideration for the deceleration of the operation of the dehumidifier 11 (Y branch of S1110), a deceleration flag is set. (Not shown) After this process, the process returns to the overall flow (S1116). Otherwise, it is determined whether or not the damper needs to be adjusted to a value lower than the value (denoted as Thd). If the pressure is lower than the threshold Thd (Y branch of S1112), the bypass damper 21 is closed (S1114). . Otherwise, this process is skipped (N branch of S1112). Then, the process returns to the overall process flow (S1116).

  In the process of opening and closing the bypass damper 21 (S1108 and S1114), the damper may be opened by a predetermined angle and the process may return to step S1102 which is the pressure acquisition process again. By doing in this way, even if the angle at which the damper moves is reduced, it is possible to shift to a stable state within this process. Further, the threshold value Thwu and the threshold value Thwd may be determined in advance, or may be changed in consideration of the amount of pressure change per unit time.

  The process shown in FIG. 3 was a process when the variation in dry air used was small. However, in the factory, the use of dry air may fluctuate more greatly, such as when a device is replaced. In this case, the entire system cannot be maintained only by the exchange between the supply chamber 15 and the outside air introduction chamber 17 as in the process of FIG.

  FIG. 4 shows a flow of how to operate when the dry air supply system 1 of the present invention is subjected to larger fluctuations. When the operation of the entire system is started (S1000), a start-up process (not shown) is performed and a steady operation is performed, and then automatic operation by a plurality of dehumidifiers 11 is performed. This automatic operation refers to the flow in the case where the required variation in dry air described with reference to FIG. 3 is small.

  Next, the power supply state of the dehumidifier 11 is acquired (S1200). This is acquired by the information signal Sh indicating the status from each dehumidifier 11, but may be acquired by other methods. This information is mainly used to determine whether the dehumidifier 11 has stopped or has failed. Through the above processing, the control unit 10 acquires the pressure state in the supply chamber 15 and the power state of each dehumidifier 11.

  Next, it is determined from these information whether or not the output decelerating of the dehumidifier 11 is necessary (S1300). As a more specific example, there is a case where the pressure in the supply chamber 15 is equal to or higher than a predetermined value although the bypass damper 21 is completely opened. This corresponds to the case where the consumption of the dry air is stopped, even if many of the drying chambers 30 that consume the dry air are primarily used. If it is determined that this situation has occurred, a process of decelerating the supply capacity of the dehumidifier 11 is performed. Details will be described later.

  Next, it is determined whether or not the output speed of the dehumidifier 11 is necessary (S1400). As a more specific example, there is a case where the pressure in the supply chamber 15 is equal to or lower than a predetermined value although the bypass damper 21 is completely closed. This corresponds to the case where a large amount of dry air is consumed, even if most of the drying chamber 30 side that consumes the dry air is primary. When it is determined that this situation has occurred, processing for increasing the supply capacity of the dehumidifier 11 is performed. Details will be described later.

  Next, it is determined whether there are any malfunctions among the plurality of dehumidifiers 11 (S1500). This is determined by detecting the failure status in the information signal Sh from the dehumidifier 11 by the control unit 10. When it is determined that this situation has occurred, processing for increasing the supply capacity of all the dehumidifiers 11 is performed. This is because even if one of the plurality of dehumidifiers 11 is stopped, the supply capacity of dry air is reduced. Details will be described later.

  If the dehumidifier 11 is not in a state of speed increase, deceleration, or failure, the process returns to step S1100 again, and the process starts from the automatic operation. The above is the main processing flow of the dry air supply system 1 of the present invention. In the overall process, the stop of the process is not particularly shown, but the entire system is stopped by forcibly stopping each dehumidifier 11.

<Deceleration processing>
Next, each process will be described in more detail. This is a case where it is determined in step S1300 that the operation needs to be decelerated. This corresponds to the case where the pressure in the supply chamber 15 is smaller than the threshold value Thwu in process S1100. When entering the branch of this process (Y branch of S1300), first, it is determined from the status by the information signal Sh of each dehumidifier 11 whether there is a dehumidifier 11 that can be decelerated (S1310).

  As described in FIG. 2, the dehumidifier 11 must be operated so that the adsorption / desorption process is harmonized, and the output cannot be continuously changed. The stable operation state has only four stages of 100%, 70%, 50%, and 0% when the maximum output is 100%. The dry air supply system 1 itself is designed so that the total supply amount of dry air can be achieved by 70% operation of each dehumidifier 11. This is so that a specified amount of dry air can be supplied even if an unexpected situation occurs.

  Whether there is a dehumidifier 11 that can be decelerated depends on whether the dehumidifier 11 that is currently operating is 100% to 70%, or 70% to 50%, or 50% to 0%. This means whether there is a dehumidifier 11 that can switch operation.

  If there is no dehumidifier 11 that can be decelerated (N branch of S1310), that is, if all the dehumidifiers 11 are operating at 50%, is the minimum number of units possible even if one of them is stopped? It is determined whether or not (S1320). The number of dehumidifiers 11 that must operate at the minimum in the entire dry air supply system 1 is determined by design. This is called the minimum operation number. The minimum number of operating units is determined because when the dehumidifier 11 is completely stopped, it takes a long time to shift to the steady operation. For example, in the dry air supply system 1 assuming that four dehumidifiers 11 are operated and maintained at 70%, a steady state cannot be maintained unless at least three dehumidifiers 11 are operating.

  Therefore, if the dehumidifier 11 is stopped any more, if it becomes less than the minimum number of operating units, this process is exited and the process returns to the automatic operation process (N branch of S1320). When the minimum number of operating units can be secured (Y branch of S1320), the dehumidifier 11 having the largest operating load among the currently operating dehumidifiers 11 is stopped (standby) (S1330).

  Here, the operating load can be, for example, a value obtained by multiplying the operation speed by time. This is because the load of the dehumidifier 11 is considered to be proportional to the number of times of adsorption / desorption of the rotor. Further, since the adsorption / desorption speed and the deterioration of the adsorption element according to the length of the operation time are also related, the operation speed and the operation time may be further multiplied. These determinations are made based on a calculation method and a table given in advance after the control unit 10 grasps the operation time and operation speed of each dehumidifier 11. The control unit 10 knows the operation time, operation speed, and the like of each dehumidifier 11 from the information signal Sh from each dehumidifier 11. Further, the control unit 10 may manage the operation time and the operation speed.

  On the other hand, when there is a dehumidifier 11 that can be decelerated (Y branch of S1310), the control unit 10 transmits a control signal Ch so as to decelerate from the dehumidifier 11 having the largest operating load (S1340).

  The control unit 10 instructs the dehumidifier 11 to perform a preliminary operation in which the input port 12 and the output port 13 are communicated with each other in both cases of decelerating operation and stopping ( S1350). That is, during this time, at least the output port 13 is closed with respect to the supply chamber 15. This is because it is necessary to enter the steady state. During this time, the system is continuously operated for a predetermined time.

  When the preparatory operation for a predetermined time is completed, the control unit 10 keeps the input port 12 and the output port 13 closed when the dehumidifier 11 is stopped, and the input port 12 when the decelerating operation is performed. An instruction is given to open the output port 13, and the process returns to automatic operation (S1100).

<Acceleration processing>
Next, processing when it is necessary to increase the driving speed will be described. This is the case where it is determined in step S1400 that the output speed needs to be increased. This is a case where the pressure in the supply chamber 15 is higher than the threshold value Thwu in the automatic operation (S1100). When entering the branch of this process (Y branch of S1400), first, it is determined from the status by the information signal Sh of each dehumidifier 11 whether there is a dehumidifier 11 capable of increasing the speed (S1410).

  Whether or not there is a dehumidifier 11 capable of increasing the speed depends on whether the dehumidifier 11 that can be switched from 50% to 70% or from 70% to 100% in the currently operating dehumidifier 11. It means that there is. When all the dehumidifiers 11 in operation are operating at 100%, there is no dehumidifier 11 that can increase the speed.

  Next, when there is a dehumidifier 11 capable of increasing the speed (Y branch of S1410), the speed is increased from the dehumidifier 11 having a small operating load (S1430). This is because the rotors of all the dehumidifiers 11 are used as evenly as possible. On the other hand, when there is no dehumidifier 11 capable of increasing the speed (N branch in S1410), the presence / absence of the dehumidifier 11 being stopped is checked (S1420). And when there exists the dehumidifier 11 which has stopped (Y branch of S1420), the driving | operation of the dehumidifier 11 is started (S1440). That is, in the dry air supply system 1 of the present invention, once stopped, the other dehumidifiers 11 do not start up automatically unless the operation of the dehumidifier 11 reaches 100%. If there is no dehumidifier 11 which has stopped (N branch of S1420), it will return to the process (S1100) of automatic operation. This is because since all the dehumidifiers 11 are operated at 100%, no further operation is possible.

  Even in the case of the speed increasing operation, similarly to the deceleration process, the control unit 10 instructs the dehumidifier 11 to communicate with the input port 12 and the output port 13 to perform the preliminary operation (S1450). This is because it is necessary to enter the steady state. During this time, the system is continuously operated for a predetermined time.

<Failure processing>
Next, processing when there is a failure will be described. This is a case where the dehumidifier 11 has a failure in step S1500. In this case, the operating speed of all the remaining dehumidifiers 11 is increased (S1510). The degree of speed increase is increased so that the output immediately before the failed dehumidifier 11 can be covered by another dehumidifier 11. At this time, the speed increasing process described above may be followed. In this case, it is desirable that the preliminary operation process in step S1520 is a process of sequentially increasing the speed of the dehumidifier 11. This is because if all the dehumidifiers 11 are set in a preliminary operation at a time, dry air cannot be supplied during that time.

  As described above, the dry air supply system 1 of the present invention includes the supply chamber 15 and the outside air introduction chamber 17 communicated with each other by the bypass damper 21, so that the dry air corresponding to the required amount of dry air can be efficiently generated. Can be provided. In addition, since the plurality of dehumidifiers 11 are accelerated or decelerated based on the operation load based on the respective operation time and the like, the suction rolls of each dehumidifier 11 are consumed uniformly, so the roll replacement time is temporarily You can match.

  The present invention can be used not only in dry air supply systems in factories and the like, but also in office buildings and large ships.

DESCRIPTION OF SYMBOLS 1 Dry air supply system 10 Control part 11 Dehumidifier 12 Input port 13 Output port 14 Return pipe 15 Supply chamber 16 Bypass air path 17 Outside air introduction chamber 20 Pressure gauge 21 Bypass damper 22 Interference plate 24 Blow pipe 25 Outside air intake 30 Drying chamber 31 Air volume adjustment damper 40 Dehumidification rotor 41 Degassing rotor 42, 43, 44, 45 Blower fan 46, 47 Heating heater 60 Outside air 61 Dry air 62 Dry purified air 65, 66, 67 Regenerated gas

Claims (6)

A supply chamber in which an output port of a plurality of dehumidifiers and a blower pipe for sending dry air are communicated;
An outside air introduction chamber in which an input port and an outside air intake port of the plurality of dehumidifiers are communicated;
A bypass air passage communicating the supply chamber and the outside air introduction chamber;
A pressure gauge that is arranged on the supply chamber side in the bypass air passage and outputs a measurement value;
A bypass damper disposed on the outside air introduction chamber side from the pressure gauge in the bypass air passage and controlled to be opened and closed;
A dry air supply system including a control unit that receives a pressure signal from the pressure gauge and individually controls the bypass damper and the plurality of dehumidifiers based on the pressure signal.   The dry air supply system according to claim 1, wherein the control unit includes information on at least each operation time of the plurality of dehumidifiers.   3. The dry air supply system according to claim 2, wherein when the plurality of dehumidifiers are decelerated, the control unit decelerates from a dehumidifier having the largest operating load among the plurality of dehumidifiers.   The said control part was described in the claim in any one of Claim 2 or 3 which speeds up from a dehumidifier with few working loads in these dehumidifiers when accelerating these dehumidifiers. Dry air supply system. The plurality of dehumidifiers are controlled so that the output port and the input port can be opened and closed,
The said control part closes the output port of the said dehumidifier for a predetermined time at least when changing the driving | running state of the said dehumidifier, The dry air described in any one of the Claims 2 thru | or 4 characterized by the above-mentioned. Supply system. Each of the plurality of dehumidifiers outputs a status signal regarding its own state,
The control unit receives a status signal from the plurality of dehumidifiers, and when any of the dehumidifiers has failed, the operation of the other dehumidifier is accelerated. A dry air supply system according to claim.