JP5856415B2 - Drying device, its remodeling method and remodeling device - Google Patents

Description

  The present invention relates to a drying device using a heat pump device, a method for remodeling an existing drying device to a drying device using a heat pump device, and a drying device remodeled by the remodeling method.

  A gravure printing machine, a coating machine, and the like are devices that produce packaging films for food and daily necessities, and functional films used for flat-screen TVs, solar cells, and the like. In these devices, when printing or coating is performed on a film or the like, the main component such as a pigment or a coating liquid is diluted with an organic solvent or water and applied to the film or the like. Thereafter, the organic solvent and water are removed by heat, and the film and the like are dried. Further, the laminating machine uniformly applies an adhesive diluted with an organic solvent to a film or the like, and then removes the organic solvent by heat to dry the laminated film or the like. Hot air is used for drying a film or the like, and the hot air uses air heated using steam or fuel combustion as a heat source.

  A conventional drying apparatus used in a gravure printing machine will be described with reference to FIG. The conventional drying apparatus 100 includes a dryer 102 having a plurality of drying chambers 106a to 106c, and a drying air supply path 104 for supplying drying air to the drying chambers 106a to 106c via branch pipes 104a to 104c. ing. A nozzle 108 for blowing dry air is provided in each drying chamber. The dry air supply path 104 includes an air intake port 110 at one end, and air that removes impurities such as dust from the outside air a sucked from the air intake port 110. A filter 112 and a hot air generator 114 for heating the dry air are provided. The hot air generator 114 burns fuel with a burner and heats the air sucked from the air intake port 110. Instead of the hot air generator 114, a dryer using a steam heater is also used.

  The branch pipes 104a to 104c are connected to a number of nozzles 108 provided in the drying chambers 106a to 106c. The branch pipes 104 a to 104 c are provided with air supply fans 116 a to 116 c that suck the outside air “a” into the dry air supply path 104. The drying chambers 106a to 106c are provided with an entrance through which an object to be dried f such as a film enters and exits.

  In such a configuration, the outside air a is introduced from the air intake port 110 by the air supply fans 116a to 116c, the introduced outside air a is heated by the hot air generator 114, and the heated dry air is nozzleed in the drying chambers 106a to 106c. From 108, it blows off toward the to-be-dried material f, and dries the to-be-dried material f. The temperature of the drying air is adjusted for each drying chamber. The temperature of the dry air flowing through each branch pipe 104a-c is adjusted by the amount of outside air a supplied from the supply pipes 118a-c. Alternatively, a heater may be provided for each branch path, and the temperature of the dry air supplied to each drying chamber may be changed. The exhaust e after being dried in the drying chambers 106 a to 106 c is exhausted from the exhaust path 120.

  Patent Document 1 discloses a drying device for a gravure printing machine. This drying device uses a plurality of nozzles arranged in the running direction on a substrate (soft packaging material mainly made of plastic film) on which the ink is transferred to the printing surface and is guided by a guide roll. The ink is dried by discharging hot air heated by a heater or the like. The air volume of the nozzle is gradually increased toward the downstream side in the running direction of the base material to prevent a skinning phenomenon (a phenomenon in which only the ink surface is evaporated and dried, and the inside becomes an undried state).

  Patent Document 2 discloses a drying device for a laminating machine. The drying apparatus includes a drying chamber in which a base material that has been laminated and guided by a guide roll travels, and a spray nozzle that is disposed in the drying chamber along the travel direction of the base material and blows hot air toward the base material. And a heating device that uses electric heat or steam as a heat source and supplies hot air to the spray nozzle. In this drying apparatus, most of the hot air for drying is circulated and used repeatedly to improve thermal efficiency.

  The temperature of the drying air is selected from the viewpoints of the drying speed that leads to productivity and the avoidance of the skinning phenomenon. Usually, in gravure printing, for example, dry air of 50 to 70 ° C. is supplied to the drying chamber, 60 to 80 ° C. in the laminating process, and in the coating machine, the amount of the coating liquid and the organic solvent is large. Dry air of about 0 ° C. is supplied to the drying chamber.

  As described above, dry air is heated by electric heating, steam heating, or fuel combustion. As an energy saving measure for these heating methods, there is a system in which exhaust gas exhausted from the dryer and drying air are recovered by a gas-gas plate heat exchanger. However, this energy saving means has low heat recovery efficiency because the temperature of the exhaust gas is low. In addition, the apparatus is increased in size and there is a problem in the layout of the duct.

On the other hand, a drying device using a heat pump device as a heating means has been proposed for drying clothes and other industrial drying devices. This drying apparatus can obtain higher thermal efficiency than the heating means. For example, in Patent Document 3, high-temperature air heated by a hot air generator equipped with a heat pump device including CO ₂ as a refrigerant and an air heater, a water heat source evaporator, and the like is used as wood, marine products, industrial parts, etc. It is disclosed for use in drying.

JP 2005-178235 A Japanese Patent Laid-Open No. 62-110777 JP 2010-281553 A

  In the gravure printing machine, every time the printed material is changed, it is necessary to change the plate and ink, and to correct the color tone. In addition, when the printed matter changes, the number of printing colors increases or decreases, and the printing line speed increases or decreases. Therefore, it is necessary to frequently change the temperature and air volume of the dry air. Also in laminating machines and coating machines, it is necessary to frequently change the temperature and air volume of dry air according to the thickness of the film, the number of film layers, or the amount of coating liquid. When applying a drying device using a heat pump device to these devices, it is necessary to enable stable operation while responding to frequent fluctuations in the temperature and air volume of the drying air.

  In view of the problems of the prior art, the present invention is a drying device using a heat pump device, which maintains high thermal efficiency and enables stable operation even with frequent fluctuations in the temperature and air volume of the drying air. The object is to realize the device. In addition, when remodeling from a conventional drying device using a heating device such as a burner or steam heater to a drying device using a heat pump device, the existing equipment can be used as it is without any major modification. The second object is to make it possible easily and at low cost.

  In order to achieve such an object, the drying apparatus of the present invention is a drying apparatus including a dryer having a drying chamber through which an object to be dried enters and exits, and a heat pump device that heats dry air sent to the dryer. A drying air supply path having an air inlet at one end, led to the dryer via the air heater of the heat pump device, and having an air opening between the heat pump device and the dryer, and evaporation of the heat pump device A heat source water circulation path is connected to the cooler, a cooling device using the heat source water cooled by the evaporator as a cold heat source, and a dry air provided in a dry air supply path downstream from the atmosphere opening and heated by a heat pump device The first blower that supplies the air to the dryer and the second blower that is provided in the dry air supply path upstream from the atmosphere opening and that takes in air from the air intake and supplies it to the air heater of the heat pump device The air flow sensor and the air temperature sensor provided in the dry air supply path between the air opening and the first blower, and the operation of the heat pump device are controlled based on the detected values of the air flow sensor and the air temperature sensor. And a controller for controlling the amount of air blown from the second blower, and the difference in the amount of air blown between the first blower and the second blower is adjusted by taking air in and out of the atmosphere opening port. is there.

  In the device of the present invention, a heat source water circulation path is connected to the evaporator of the heat pump device, and a cooling device using the heat source water cooled by the evaporator as a cold heat source is provided, so that the heat pump device can be fully operated and stably operated. Make it possible. Thereby, the drying air taken in from the outside air can be heated to high-temperature air necessary for drying. Further, even when outside air is taken in from the air opening, the drying air can be kept at a high temperature necessary for drying with a margin. Furthermore, the cooling device can be used as an air conditioner necessary for the dryer side equipment or a cooling device for a production line.

Moreover, the first blower and the second blower are provided and are operated separately, thereby ensuring the amount of dry air necessary for the dryer and stable operation of the heat pump device. Further, by controlling the operation of the heat pump device or the amount of air blown by the second blower with a controller based on the detected values of the air flow rate sensor and the air temperature sensor, it is possible to stabilize the dry air having the temperature and air amount necessary for the dryer. Supply is possible. Furthermore, an air opening is provided in the dry air supply path, and the difference in the amount of air flow between the first blower and the second blower is adjusted by taking in and out the air from the air opening, so that the drying air required by the dryer can be adjusted. While being able to cope with frequent fluctuations in temperature and air volume, it is possible to achieve stable energy-saving operation of the heat pump device and to improve the safety of the entire device.

The air flow sensor may be configured not to directly detect the air flow rate, but to detect the pressure or flow velocity of the dry air and indirectly determine the flow rate of the dry air from those detected values. In the present invention, CO ₂ and alternative chlorofluorocarbon can be used as the refrigerant of the heat pump apparatus. When CO ₂ is used, CO ₂ is not condensed by the air heater, and when alternative chlorofluorocarbon is used, the alternative chlorofluorocarbon is condensed by the air heater.

  In the device of the present invention, an air flow rate adjustment damper capable of adjusting the opening degree is provided in the dry air supply path between the heat pump device and the atmosphere opening port, and the air flow rate is adjusted so that the detected value of the air temperature sensor becomes the set temperature by the controller. It is advisable to adjust the opening of the adjustment damper. The temperature of the dry air supplied to the dryer can be adjusted by controlling the operation of the heat pump device and the air flow rate of the second blower. However, by providing the air flow rate adjusting damper, the temperature of the dry air is improved. In addition, the temperature can be adjusted over a wide range. Therefore, it is possible to quickly respond to the demand for frequent temperature fluctuations of the dry air.

  In the device of the present invention, an air release damper whose opening degree can be adjusted is provided in a dry air supply path between the heat pump device and the air release port, the opening degree of the air release damper is adjusted by a controller, and the upstream side of the air release damper is The air pressure in the dry air supply path is preferably adjusted. This makes it possible to quickly respond to frequent changes in the required air volume of dry air.

  In the apparatus of the present invention, an auxiliary air heater may be provided in the dry air supply path downstream of the atmosphere opening. This makes it possible to quickly respond to frequent changes in the required temperature of dry air. Therefore, the apparatus of the present invention is particularly preferably used in a drying apparatus attached to a gravure printing machine, laminating machine, and coating machine in which the required temperature and required air volume of dry air frequently change.

The method for remodeling the drying apparatus of the present invention is as follows:
A dryer having a drying space for drying an object to be dried; a first dry air supply passage having a first air intake port at one end and the other end led to the dryer; In a method for remodeling a drying apparatus including a first blower and a first air heater provided in a first dry air supply path,
A heat pump device is provided in the first dry air supply path, and a second dry air supply path having a second air intake port at one end is connected to the second air heater of the heat pump apparatus, and the other end is connected. a first step of connecting the first dry air supply path of the first air intake port downstream side,
A second blower that takes air from the second air intake into the second dry air supply path and supplies the air to the second dry air supply path via the second air heater. A second step of providing
A third step of attaching an air flow rate sensor and an air temperature sensor to a first dry air supply path upstream of the first blower and the first air heater downstream from the first air intake;
A fourth step of connecting a heat source water circulation path cooled by the evaporator to the evaporator of the heat pump device and providing a cooling device using the heat source water flowing through the heat source water circulation path as a cold heat source;
Based on the detected values of the air flow rate sensor and the air temperature sensor, the operation of the heat pump device is controlled, and the fifth step is provided with a controller for controlling the air flow rate of the second blower.

  According to the remodeling method of the present invention, an existing drying apparatus using an electric heater or steam heating as a heating source or a fuel combustion type hot air generator as a heating source can be remodeled to a drying apparatus using a heat pump device with high thermal efficiency. In addition, since the existing equipment can be used almost without modification, and a new equipment such as a heat pump device need only be added to the existing equipment, the modification process can be completed in a short time and at a low cost.

  Also, in the fourth step, by providing a heat source water circulation path and a cooling device that uses the heat source water flowing through the heat source water circulation path as a cold heat source, the heat pump device can be fully operated and stably operated, and the drying air taken in from the outside air Can be heated to high temperature air necessary for drying. Moreover, even when outside air is taken in from the first air intake port, the drying air can be maintained at a high temperature necessary for drying with a margin. Furthermore, the cooling device can be used as an air conditioner necessary for the dryer side equipment or a cooling device for a production line.

  In the remodeling method of the present invention, a sixth step of providing an air flow rate adjusting damper whose opening is adjusted by the controller so that the detected value of the air temperature sensor becomes the set temperature in the second dry air supply path downstream of the heat pump device. It is good to add further. As a result, the temperature of the dry air can be adjusted to the set temperature in a wide range with good responsiveness. Therefore, it is possible to quickly respond to frequent fluctuations in the required temperature of dry air.

  In the remodeling method of the present invention, the second dry air supply path downstream of the heat pump device is provided with an air release damper that adjusts the air pressure of the second dry air supply path downstream by adjusting the opening degree by the controller. Seven steps may be further added. This makes it possible to quickly respond to frequent changes in the required air volume of dry air.

  The drying apparatus remodeled by the remodeling method of the present invention can be manufactured using the existing equipment as it is without significantly remodeling the equipment constituting the existing drying equipment, so that the remodeling cost is low. Moreover, the above-mentioned effect obtained by the drying apparatus of the present invention can be obtained.

  According to the drying device of the present invention, the heat pump is used to increase the thermal efficiency, and the heat pump provided with the cooling device that uses the heat source water cooled by the evaporator as the cooling heat source is provided in the water heat source evaporator of the heat pump device. Enables full operation and stable operation of the equipment. As a result, even when outside air is taken in from the air opening, the temperature and air volume of the drying air necessary for drying the material to be dried can be secured with sufficient margin, and the cooling device must be installed in the air conditioner and production required for the dryer side equipment. It can be used as a line cooling device.

  Moreover, the air volume of the dry air required for a dryer is ensured with the 1st air blower, and the stable operation of the heat pump apparatus is enabled by the 2nd air blower. In addition, the controller controls the operation of the heat pump device based on the air flow rate sensor, the air temperature sensor, and the detected values thereof, and also controls the air flow rate of the second blower, so that the temperature and air flow required for the dryer are controlled. The dry air can be supplied. Furthermore, since the difference in the amount of air flow between the first blower and the second air blower is adjusted at the air opening provided in the dry air supply path, the temperature of the dry air and the air flow required by the dryer are frequently changed. It is possible to respond quickly to such fluctuations and to improve the safety of the entire apparatus.

  In this way, even if it is applied to drying equipment such as gravure printing machines, laminating machines, coating machines, etc., where fluctuations in operating conditions according to the season and product of the dryer, or frequent start / stop of the dryer, it is possible to respond quickly. It is possible and stable operation is possible.

  Further, according to the remodeling method of the present invention, the existing equipment can be used as it is without requiring a large remodeling of the existing equipment, so that the remodeling to the drying apparatus using the heat pump device with high thermal efficiency can be performed in a short period of time. It can be realized at a cost.

It is a whole block diagram of the drying apparatus which concerns on one Embodiment of this invention apparatus. It is a flowchart which shows the operation | movement procedure of the said drying apparatus. It is a flowchart which shows the operating method of the said drying apparatus. It is a diagram which shows the operation method at the time of the drying air temperature adjustment of the said drying apparatus. It is a diagram which shows the operation method at the time of the drying air pressure adjustment of the said drying apparatus. It is a whole block diagram of the conventional drying apparatus.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(Embodiment 1)
One embodiment of the device of the present invention will be described with reference to FIGS. FIG. 1 shows an overall configuration of a drying apparatus 10 according to the present embodiment. In FIG. 1, a dryer 12 is a dryer of a laminating machine, for example, and includes three drying chambers 16a to 16c arranged in series, and the drying chambers 16a to 16c have an adhesive on a film to be laminated. After the coating, an entrance is provided for the film f to be dried. The first dry air supply path 14 is divided into branch paths 14a to 14c, and is connected to a number of nozzles 18 disposed in the drying chambers 16a to 16c.

  The branch paths 14a to 14c are provided with auxiliary air heaters 20a to 20c and air supply fans 22a to 22c using steam or electric heaters as heat sources. The drying chambers 16 a to 16 c are provided with exhaust passages 24 a to 24 c, and the exhaust passages 24 a to 24 c are connected to the main exhaust passage 24. An exhaust fan 26 is provided in the main exhaust path 24. An air release port 28 is provided at one end of the first dry air supply path 14. Further, an air filter 29 for removing impurities in the dry air is provided on the downstream side of the air opening 28. A second dry air supply path 30 is connected to the first dry air supply path 14 between the atmosphere opening 28 and the air filter 29. The other end of the second dry air supply path 30 is provided with an air intake 31 provided with an air filter 32.

A blower fan 34 and an inverter device 36 that can change the rotational speed of the blower fan 34 are provided on the downstream side of the air intake 31. A heat pump device 40 is provided on the downstream side of the blower fan 34. In the heat pump device 40, a compressor 402, an air heater 404, an expansion valve 406, and an evaporator 408 are interposed in the refrigerant circuit 400, and constitutes a heat pump cycle using CO ₂ as a refrigerant. The second dry air supply path 30 is connected to the air heater 404. The CO ₂ refrigerant becomes high temperature and high pressure in the compressor 402, and the outside air a taken into the second dry air supply path 30 from the air intake 31 is heated by exchanging heat with the CO ₂ refrigerant in the air heater 404. . The CO ₂ refrigerant is decompressed by the expansion valve 406 and sent to the evaporator 408.

  The evaporator 408 is connected to a main circulation path 42 that includes a water supply path 42a and a water return path 42b through which heat source water circulates. A temperature sensor 44 for detecting the temperature of the heat source water is attached to the water supply path 42a. A first branch circulation path 46 including a first branch water supply path 46a and a first branch water return path 46b, and a second branch water supply path 50a and a second branch water return path 50b are provided on the downstream side water supply path 42a of the temperature sensor 44. A two-branch circuit 50 is connected. The first branch circuit 46 is connected to an air conditioning cooling device 48 such as an air conditioner or a refrigerator, and the second branch circuit 50 is connected to a production cooling device 52 such as a cooling tower or an air cooling chiller. Yes. The air conditioning cooling device 48 and the production cooling device 52 are provided in a production line such as a laminating machine.

  A heat source water pump 54 that circulates the heat source water in the direction of the arrow is provided in the return water passage 42b, and an inverter device 56 that makes the rotation speed of the heat source water pump 54 variable and the flow rate of the heat source water variable is provided. The heat source water is supplied as a cooling medium to the air conditioning cooling device 48 and the production cooling device 52. The production cooling device 52 is provided with a temperature sensor 58 for detecting the temperature of the heat source water supplied to the production cooling device 52, and the temperature sensor 60 for detecting the temperature of the heat source water is provided in the water return channel 42b. A three-way valve 64 capable of switching and supplying heat source water to the production cooling device 52 or the bypass passage 62 is provided in the second branch water supply passage 50a. The detection values of the temperature sensors 58 and 60 are input to the controller 66, and the controller 66 controls the operation of the three-way valve 64 in order to set these detection values to the set temperature.

  On the downstream side of the heat pump device 40, the second dry air supply path 30 is provided with a pressure sensor 68 that detects the pressure of the dry air. At the downstream side of the pressure sensor 68, an air opening 70 and an air opening damper 72 for opening and closing the air opening 70 and adjusting the opening degree are provided. A temperature adjustment damper 74 that adjusts the temperature of the dry air by adjusting the flow rate of the second dry air supply path 30 is provided on the downstream side of the air opening 70.

  A temperature sensor 76 is provided in the vicinity of the air opening 28 in the first dry air supply path 14. Further, an air volume sensor 78 for detecting the flow rate of the dry air and a temperature sensor 80 for detecting the temperature of the dry air are provided on the downstream side of the air filter 29. The air volume sensor 78 uses, for example, a Pitot tube and detects the flow rate of dry air. Alternatively, for example, a sensor that detects the pressure of dry air may be provided, and the flow rate of dry air may be calculated from the detected value.

  In such a configuration, the outside air a is taken in from the air intake 31 by the blower fan 34, and impurities are removed by the air filter 32 to obtain clean air. Clean air is heated by the air heater 404 of the heat pump device 40. The heated dry air is reheated by the auxiliary air heaters 20a to 20c as necessary, and is supplied to the drying chambers 16a to 16c by the air supply fans 22a to 22c. The laminated film f is dried with dry air in the drying chambers 16a to 16c.

  The temperature of the heat source water cooled by the evaporator 408 and sent to the water supply passage 42 a is detected by the temperature sensor 44, and this detected value is input to the controller 82. The controller 82 controls the inverter device 56 so that the heat source water reaches a set temperature (for example, 7 ° C. for the air conditioning cooling device 48 and 25 ° C. for the production cooling device 52) by the air conditioning cooling device 48 and the production cooling device 52. The flow rate of the heat source water flowing through the circulation path 42 is adjusted. At this time, in order to prevent the heat recovery efficiency in the evaporator 408 from being lowered, the flow rate of the heat source water is maintained at a required minimum flow rate or more.

  When the amount of heat that can be supplied from the air conditioning cooling device 48 is less than the required recovered heat amount of the evaporator 408, the production cooling device 52 compensates for the insufficient heat amount. The energy consumption in cooling is larger in the air conditioning cooling device 48. Therefore, the heat source water supply from the heat pump device 40 is preferentially supplied to the air conditioning cooling device 48, and a greater amount of energy saving can be obtained by stopping the air conditioning cooling device 48.

  When the cooling load of the air-conditioning cooling device 48 is sufficiently large in summer or the like, the heat source water coming out of the air-conditioning cooling device 48 has an appropriate temperature (for example, 12 ° C.), and the heat pump device 40 is in an operation state with high thermal efficiency. However, when the cooling load of the air-conditioning cooling device 48 is insufficient, such as in the intermediate period or winter, the heat source water coming out of the air-conditioning cooling device 48 has an inappropriate temperature (less than 12 ° C. to 7 ° C.). Therefore, it becomes difficult to operate the heat pump device 40, or it is necessary to increase the flow rate of the heat source water due to the lack of heat amount of the heat source water, and the power consumption increases. In order to eliminate these problems, heat is supplied from the production cooling device 52 to the heat source water.

  The temperature of the heat source water supplied to the production cooling device 52 is detected by the temperature sensor 58, and the three-way valve 64 is controlled by the controller 66 so as to reach a set temperature (for example, 25 ° C.). The supply is switched to the bypass 62. Further, the temperature sensor 60 detects the heat source water temperature of the water return path 42b, and controls the three-way valve 64 so that the temperature difference between the heat source water flowing through the water supply path 42a and the water return path 42b becomes an appropriate temperature (for example, 5 ° C.). .

  With these controls, the temperature of the heat source water flowing through the water supply path 42a and the water return path 42b can be controlled to an optimum temperature for energy-saving operation of the heat pump device 40, thereby responding to changes in seasons and operating conditions of the dryer 12. Thus, the energy saving operation of the heat pump device 40 is enabled.

Outside air a is taken in from the air intake 31 by the blower fan 34, and becomes clean air through the air filter 32. This clean air is heated by the CO ₂ refrigerant in the air heater 404. The heated dry air is supplied from the second dry air supply path 30 to the drying chambers 16a to 16c of the dryer 12 through the first dry air supply path 14 and the branch paths 14a to 14c. The amount of dry air required for each of the drying chambers 16a to 16c is set by operating the air supply fans 22a to 22c. The air supply fans 22a to 22c are manually started and stopped by an operator of the laminating machine. The difference between the amount of air blown from the second dry air supply path 30 and the total amount of air blown from the air supply fans 22a to 22c is adjusted by taking in and out the outside air through the atmosphere opening port 28.

  The operation procedure of the drying apparatus 10 will be described with reference to FIG. First, the production machine such as a laminating machine and the drying device 10 start operation (S10). When the production machine is in operation (S12) and the drying apparatus 10 is also in operation (S14), (necessary dry air amount of the dryer 12)> (dry air amount after being heated by the heat pump device 40) (S16), the air amount that is the difference between the air blowing amount of the air supply fans 22a to 22c and the air blowing amount of the blower fan 34 is sucked from the atmosphere opening port 28 (S18). When (required dry air amount of the dryer 12) <(dry air amount after heating by the heat pump device 40) (S16), a differential air amount is blown out from the atmosphere opening port 28 (S20). When the production machine is in operation (S12) and the drying apparatus 10 is stopped or malfunctioning (S14), dry air is sucked from the air opening 28 (S22).

  When the dry air flows into the first dry air supply path 14, impurities are removed by the air filter 29. When the temperature of the dry air that has passed through the air filter 29 is insufficient, the temperature shortage is heated by the auxiliary air heaters 20a to 20c. Dry air is blown out from the nozzle 18 by the air supply fans 22a to 22c to dry the film f. The dried air after the drying process is discharged to the outside from the exhaust paths 24a to 24c and the main exhaust path 24 by the exhaust fan 26 together with the organic solvent and the like generated by the drying process. The exhaust gas is discharged into the atmosphere after being processed by a deodorizing device (not shown). The auxiliary air heaters 20a to 20c are provided for each of the branch paths 14a to 14c. Instead, one auxiliary air heater or one hot air generator is connected to the first dry air supply path 14. You may make it provide in.

  Based on the detection value of the air volume sensor 78, the controller 82 determines that the air supply fans 22a to 22c are in operation, and starts the operation of the blower fan 34 and the heat pump device 40. Moreover, when it determines with the air supply fans 22a-c having stopped from the detected value of the air volume sensor 78 with the controller 82, the ventilation fan 34 and the heat pump apparatus 40 are stopped. Further, the inverter device 36 is controlled by the controller 82 in accordance with the detection value of the pressure sensor 68, and the air flow rate of the blower fan 34 is controlled.

  As another determination means for determining whether the supply air fans 22a to 22c are stopped, the determination may be made from the detection value of the temperature sensor 76. When the air supply fans 22a to 22c are stopped or the air blowing fan 34 has a larger amount of air than the air blowing fans 22a to 22c, the heated dry air flows out from the atmosphere opening port 28. The presence or absence of outflow of heated dry air can be determined based on the detection value of the temperature sensor 76.

  A method of temperature control and pressure control of dry air will be described with reference to FIG. The temperature control of the dry air on the downstream side of the air opening 28 is performed by the opening degree control of the temperature adjustment damper 74. The pressure control of the dry air on the downstream side of the heat pump device 40 is performed by controlling the air volume of the blower fan 34 with a high pressure setting. Further, pressure control is performed by opening control of the open air damper 72 at a high pressure setting. This operation is illustrated in FIG.

  For example, when the temperature of the dry air detected by the temperature sensor 80 is higher than the temperature required by the dryer 12, the controller 82 operates the temperature adjustment damper 74 and the flow rate of the dry air in the second dry air supply path 30. Reduce. As a result, since a shortage of air is sucked from the atmosphere opening port 28, the temperature of the dry air is lowered to the set temperature. At this time, the pressure of the dry air on the downstream side of the heat pump device increases, and the pressure control method at this time is shown in FIG. In order to detect the dry air pressure with the pressure sensor 78 and keep the dry air pressure constant, the controller 82 controls the inverter device 36 to control the air flow rate of the blower fan 34. The increase / decrease time of the blower fan 34 is provided in the inverter device 36 so that the temperature control of the dry air by the heat pump device 40 can follow.

  When the pressure control of the dry air by the air flow increase / decrease of the blower fan 34 cannot follow, such as when a sudden pressure fluctuation occurs, the controller 82 controls the air release damper 72 to control the opening degree of the air release port 70, Keep dry air pressure constant. FIG. 4 shows the relationship between the temperature of the dry air downstream of the air opening 28 and the opening degree of the temperature adjustment damper 74. The opening degree of the temperature adjustment damper 74 is controlled so that the temperature of the dry air becomes the set temperature. When the temperature of the dry air is higher than the set temperature, the opening degree of the temperature adjustment damper 74 is reduced to the set temperature.

  According to this embodiment, the heat efficiency can be improved by using the heat pump device 40 as compared with a heater using steam or an electric heater as a heating source, a hot air generator of a fuel combustion type, or the like. Further, the air supply fan 22a-c can secure the air volume of the dry air necessary for the dryer 12, and the blower fan 34 can ensure the air volume of the dry air necessary for the stable operation of the heat pump device 40.

In addition, CO ₂ is used as the refrigerant of the heat pump device 40, the main circulation path 42 is connected to the evaporator 408 of the heat pump device 40, and the air conditioning cooling device 48 uses the heat source water cooled by the evaporator 408 as a cold heat source. Further, by providing the production cooling device 52, it is possible to sufficiently recover the heat of the evaporator 408. Therefore, the heat pump device 40 can be fully operated and stably operated. Thereby, the drying air taken in from the outside air a can be heated to high-temperature air necessary for drying. Further, even when outside air is taken in from the air opening 28, the drying air can be kept at a high temperature necessary for drying with a margin. Furthermore, the air-conditioning cooling device 48 and the production cooling device 52 can be used as an air-conditioning device or a cooling device necessary for a production line such as a laminating machine.

  Further, by providing the three-way valve 64, the temperature sensors 58 and 60, and the controller 66, the temperature difference between the heat source water flowing through the water supply passage 42a and the heat source water flowing through the return water passage 42b can be controlled to the temperature difference with the highest thermal efficiency. . Therefore, the energy saving operation of the heat pump device 40 corresponding to the season of the dryer 12 and the change of the operation conditions becomes possible.

  Further, since the difference in the amount of air flow between the air supply fans 22a to 22c and the air blowing fan 34 is allowed by taking air in and out through the atmosphere opening port 28, fluctuations in the operating conditions of the dryer 12 and the operation. When stopping, the time lag of increase / decrease in the air volume between the air supply fans 22a to 22c and the blower fan 34 can be absorbed, and even when the heat pump device 40 breaks down, the dry air can be supplied to the dryer 12 from the atmosphere opening port 28. In this way, it is possible to quickly cope with frequent fluctuations in the temperature and air volume of the drying air required by the dryer 12 such as a laminating machine, and it is possible to improve the safety of the entire drying apparatus.

  Moreover, since the difference in the air flow rate between the air supply fans 22a to 22c and the blower fan 34 is detected by the air flow sensor 78 and the air flow rate of the blower fan 34 is adjusted based on the detected value, it is necessary for the dryer 12. It is possible to respond quickly to frequent fluctuations in the air volume of dry air. Further, the temperature sensor 80 detects the temperature of the dry air downstream of the air opening 28 and controls the opening degree of the temperature adjustment damper 74 so that the detected value becomes the set temperature. Therefore, it is possible to adjust the temperature of the dry air with high accuracy in response to frequent fluctuations in the temperature of the dry air required by the factory.

  In addition, an air opening 70 and an air opening damper 72 that can adjust the opening degree of the air opening 70 are provided, and the pressure of the dry air after being heated by the heat pump device 40 is controlled by increasing or decreasing the air volume of the blower fan 34. Pressure fluctuations that cannot be followed by the increase or decrease in the air volume of the blower fan 34 are controlled by opening control of the atmospheric release damper 72, so that rapid response to sudden pressure fluctuations in the dry air required by the dryer 12 can be made quickly. Become.

Further, since the auxiliary air heaters 20a to 20c are provided in the air supply fans 22a to 22c, it is possible to quickly cope with a change in the temperature condition of the drying air of the dryer 12. Further, since CO ₂ is used as the refrigerant of the heat pump device 40, the dry air can be easily heated to a temperature of 60 to 80 ° C. necessary for drying the laminated film f.

Although the auxiliary air heaters 20a to 20c are provided in the present embodiment, the auxiliary air heaters 20a to 20c are not necessarily provided in the present invention. Further, instead of CO ₂ , an alternative chlorofluorocarbon can be used as the refrigerant. Further, a gas-water heat exchanger may be provided in the main exhaust passage 24 to recover the retained heat of the exhaust e by heat source water. Further, the heat source water may recover heat from well water, exhaust heat from a deodorizing device provided in the exhaust path, cogeneration exhaust heat, air, or the like.

(Embodiment 2)
Next, an embodiment of the remodeling method of the present invention will be described with reference to FIGS. The present embodiment is an example in which the conventional drying apparatus 100 shown in FIG. 6 is modified to the drying apparatus 10 shown in FIG. First, as a first step, the heat pump device 40 is provided adjacent to the dry air supply path 104. Next, the second dry air supply path 30 provided with the air intake 31 with the air filter 32 at one end is connected to the air heater 404 of the heat pump device 40 and the other end of the second dry air supply path 30 is connected. Is connected to the first dry air supply path 104 between the air intake port 110 and the air filter 112.

  Next, as a second step, a blower fan 34 is interposed in the second dry air supply path 30 between the air intake 31 and the heat pump device 40. Next, as a third step, the air volume sensor 78 and the temperature sensor 80 are attached to the first dry air supply path 104 between the air filter 112 and the hot air generator 114. Next, as a fourth step, the main circulation path 42 of the heat source water connected to the evaporator 408, the first branch circulation path 46, the second branch circulation path 50, the air conditioning cooling device 48, the production cooling device 52, and the heat source water. A heat recovery facility for heat source water composed of incidental facilities such as a pump 54 will be installed.

  Next, as a fifth step, a temperature adjustment damper 74 is provided in the second dry air supply path 30. Next, as a sixth step, an atmosphere release port 70, an atmosphere release damper 72, and a pressure sensor 68 are provided in the second dry air supply path 30. Next, as a seventh step, a controller 82 is provided which receives detection values of various sensors of the drying apparatus 10 and controls the devices of the drying apparatus 10 based on these detection values. Thus, the drying apparatus 10 shown in FIG. 1 can be modified. The air intake 110 is used as the atmosphere opening 28 in FIG.

  According to the present embodiment, it is possible to remodel the drying apparatus 10 using almost the same equipment as the conventional drying apparatus 100 with almost no modification. Therefore, the existing equipment can be used effectively, the remodeling process can be shortened, and the remodeling cost can be reduced. Further, as a means for determining the operation or stop of the air supply fans 22a to 22c, when determining with the operation signal of the air supply fans 22a to 22c or the signal from the flow switch attached to the air supply fans 22a to 22c, a new electric Although wiring work is required, the method of determining based on the detection values of the air volume sensor 78 and the temperature sensor 76 as in the above embodiment does not require new electric wiring work.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal efficiency which is high using a heat pump apparatus, and can also implement | achieve the drying apparatus which enables a stable driving | operation also with respect to the frequent fluctuation | variation of the temperature and air volume of dry air is realizable.

DESCRIPTION OF SYMBOLS 10,100 Drying device 12,102 Dryer 14 1st dry air supply path 14a-c, 104a-c Branch path 16a-c, 106a-c Drying chamber 18,108 Nozzle 20a-c Auxiliary air heater 22a-c Air supply fan (first blower)
24 Main exhaust passages 24a to c Exhaust passage 26 Exhaust fans 28, 70 Atmospheric opening 29, 32, 112 Air filter 30 Second dry air supply passage 31, 110 Air intake 34 Blower fan (second blower)
36, 56 Inverter device 40 Heat pump device 400 Refrigerant circulation path 402 Compressor 404 Air heater 406 Expansion valve 408 Evaporator 42 Main circulation path 42a Water supply path 42b Water return path 44, 58, 60, 76, 80 Temperature sensor 46 First branch Circulation path 46a First branch water supply path 46b First branch water return path 48 Air conditioning cooling device 50 Second branch circulation path 50a Second branch water supply path 50b Second branch water return path 52 Production cooling apparatus 54 Heat source water pump 62 Bypass path 64 Three-way valve 66, 82 Controller 68 Pressure sensor 72 Open air damper 74 Temperature adjustment damper (air flow adjustment damper)
78 Air volume sensor 104 Dry air supply path 114 Hot air generator a Outside air e Exhaust f Film

Claims (8)

In a drying apparatus comprising a dryer having a drying chamber through which a material to be dried enters and exits, and a heat pump device that heats dry air sent to the dryer,
A dry air supply path having an air intake at one end, led to the dryer via an air heater of the heat pump device, and having an air opening between the heat pump device and the dryer;
A heat source water circuit is connected to the evaporator of the heat pump device, and a cooling device using the heat source water cooled by the evaporator as a cold heat source,
A first blower that is provided in a dry air supply path downstream from the atmosphere opening, and that supplies dry air heated by a heat pump device to the dryer;
A second air blower that is provided in a dry air supply path upstream from the atmosphere opening and that takes in air from the air intake and supplies it to an air heater of a heat pump device;
An air flow rate sensor and an air temperature sensor provided in a dry air supply path between the atmosphere opening and the first blower;
A controller for controlling the operation of the heat pump device based on the detected values of the air flow rate sensor and the air temperature sensor, and for controlling the blast volume of the second blower,
A drying apparatus characterized in that the difference in the amount of air blown between the first blower and the second blower is adjusted by taking air in and out of the atmosphere opening port.   An air flow rate adjustment damper capable of adjusting the opening is provided in the dry air supply path between the heat pump device and the atmosphere opening, and the air flow rate adjustment is performed by the controller so that the detected value of the air temperature sensor becomes a set temperature. The drying apparatus according to claim 1, wherein the opening degree of the damper is adjusted.   A dry air supply path between the heat pump device and the air release port is provided with an air release damper whose opening degree can be adjusted, the opening degree of the air release damper is adjusted by the controller, and the upstream side of the air release damper is dried. 2. A drying apparatus according to claim 1, wherein the air pressure in the air supply path is adjusted.   The drying apparatus according to claim 1, wherein an auxiliary air heater is provided in a dry air supply path downstream of the atmosphere opening.   It uses as a drying apparatus of a gravure printing machine, a laminating machine, or a coating machine, The drying apparatus in any one of Claims 1-4 characterized by the above-mentioned. A dryer having a drying space for drying an object to be dried; a first dry air supply passage having a first air intake port at one end and the other end led to the dryer; In a method for remodeling a drying apparatus including a first blower and a first air heater provided in a first dry air supply path,
A heat pump device is provided in the first dry air supply path, and a second dry air supply path having a second air intake port at one end is connected to the second air heater of the heat pump apparatus, and the other end is connected. a first step of connecting the first dry air supply path of the first air intake port downstream side,
A second blower that takes air from the second air intake into the second dry air supply path and supplies the air to the second dry air supply path via the second air heater. A second step of providing
A third step of attaching an air flow rate sensor and an air temperature sensor to a first dry air supply path upstream of the first blower and the first air heater downstream from the first air intake;
A fourth step of connecting a heat source water circulation path cooled by the evaporator to the evaporator of the heat pump device and providing a cooling device using the heat source water flowing through the heat source water circulation path as a cold heat source;
The drying step is characterized by comprising a fifth step of controlling the operation of the heat pump device based on the detected values of the air flow rate sensor and the air temperature sensor and providing a controller for controlling the air flow rate of the second blower. How to modify the device.   Adding a sixth step of providing an air flow rate adjustment damper whose opening degree is adjusted by the controller so that the detected value of the air temperature sensor becomes a set temperature in the second dry air supply path downstream of the heat pump device; The method for remodeling a drying apparatus according to claim 6.   A seventh step is provided in the second dry air supply path on the downstream side of the heat pump device, in which an opening is adjusted by the controller and an atmospheric release damper for adjusting the air pressure in the second dry air supply path on the downstream side is provided. The method for remodeling a drying apparatus according to claim 6 or 7,

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