JP2007061411A - Entrance temperature control type drying method of laundry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for drying the laundry, capable of reducing the emission of carbon dioxide without unnecessarily consuming the thermal energy. <P>SOLUTION: In this drying method of the laundry, the laundry is dried by forcing the laundry stored in a rotary drum 14 to fall down continuously inside the drum by the rotation of the rotary drum 14 and blowing high-temperature air introduced by an introduction path to the falling laundry so that the moisture in the laundry is forcibly evaporated and is emitted to atmospheric air via a ventilation part. The temperature of the high-temperature dry air to be fed into the rotary drum 14 is set, and the high-temperature dry air is introduced into the rotary drum 14 with the temperature retained at the set temperature or a near temperature by adjusting the flow rate of steam flowing into a steam-heat exchanger 26 while detecting the temperature by an introduced air temperature sensor disposed in the introduction path. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for drying laundry, and more particularly, high temperature dry air heated and generated by a steam heat exchanger is blown onto the laundry contained in a rotating drum to evaporate moisture from the laundry. The present invention relates to a method for drying laundry.

  In the process of drying laundry consisting of dust control products such as mops and mats, towels, sheets, handkerchiefs, underwear, linen products such as cloth and aprons, and other textiles such as clothing, tumbler type ("rotary drum type" is generally used. The laundry drying apparatus is also used. Japanese Laid-Open Patent Publication No. 4-49934 (Patent Document 1) describes a rotary drum type laundry drying device for a washed dust control product. This conventional laundry drying device will be described below.

  FIG. 11 is a schematic configuration diagram of a conventional laundry drying apparatus 102. The outer drum 131 is provided with a rotary drum 114 that is rotationally driven, and a punch hole 113 is provided on almost the entire surface of the rotary drum 114. The rotating drum 114 is supported by a roller 140 and is rotationally driven by a drum motor 171 connected via a pulley 170, 172 and a belt 173. At the stage where the laundry 115 is put into the rotating drum 114, the washing, rinsing, and dehydration processes have already been completed and are in a state before drying. Moreover, the laundry 115 of FIG. 11 is a dust control product, and the spray nozzle 167 which sprays an oil agent is arrange | positioned.

  After the laundry 115 is put into the rotating drum 114, the rotating drum 115 is rotated, and the laundry 115 is continuously forcibly dropped in the rotating drum 115. Using the suction force of the exhaust fan 136, the outside air is drawn from the air guide section 125, and the outside air is heated and converted into high-temperature dry air by the steam heat exchanger 126 installed in the air guide section 125. This high-temperature dry air is introduced into the rotary drum 114, and the high-temperature dry air is sprayed onto the laundry 115 that is falling in the rotary drum 114, and moisture is forcibly evaporated from the laundry 115 and dried. The high-temperature dry air becomes medium-temperature wet air whose temperature is lowered and humidity is increased by coming into contact with the laundry 115. The medium-temperature humid air is discharged from the exhaust duct 116 to the outside by the exhaust fan 136 through the lint basket 138 for removing the dropped fibers and the exhaust section 134 through the punch hole 113.

The design philosophy of the above-mentioned conventional laundry drying device is focused on how many laundry items can be processed per unit time with a single device, and air with as low humidity as possible is introduced from outside the device. High temperature dry air heated in this way is used in the drying process, and the so-called one-pass method is adopted in which all of the medium-temperature wet air whose temperature has decreased and humidity has been increased is exhausted, and air corresponding to the exhaust amount is continuously introduced. It was. In this one-pass system, a temperature sensor is disposed in the exhaust duct 116, and the temperature is detected by the temperature sensor while adjusting the flow rate of the steam supplied to the steam heat exchanger 126, so that the detected temperature becomes a set temperature. A drying method in which dry air was introduced into the rotating drum 114 was used.
JP-A-4-49934

  Since the conventional laundry drying apparatus is provided with a temperature sensor for temperature control in the exhaust duct 116, high-temperature dry air is introduced into the rotating drum 114 and sprayed onto the laundry 115, and moisture is forcibly evaporated from the laundry 115. This means that the temperature of the medium-humidity air after the measurement is measured. However, the temperature of the medium-humidity humid air is likely to fluctuate depending on the drying state of the laundry 115, and is affected by the non-uniform heat distribution of the air in the rotary drum 114, and is detected by a temperature sensor provided in the exhaust duct 116. Since the temperature does not accurately reflect the progress of the actual drying process of the laundry 115, the conventional laundry drying apparatus needs to supply excessively high-temperature air for complete drying. For this reason, it becomes a heat excess supply state which introduce | transduces high temperature dry air into the rotating drum 114 more than the quantity required for a drying process, and the fuel consumption of the boiler used in order to supply a vapor | steam to the steam heat exchanger 126 increases. In addition, a large amount of carbon dioxide gas is released into the atmosphere. Further, the exhaust fan 136 disposed in the conventional laundry drying apparatus is designed to quickly discharge the medium-temperature wet air, and heat exchange between the high-temperature dry air and the laundry 115 is insufficient. As a result, heat energy is wasted and power consumption is enormous. Currently, reduction of carbon dioxide emissions is one of the most important issues in the world regarding environmental issues (such as the “Kyoto Protocol of the United Nations Framework Convention on Climate Change”). Energy saving operation and energy saving are required. However, since the conventional laundry drying apparatus that quickly discharges the medium-humidity humid air performs excessive heat supply as described above, it is possible to reduce the amount of carbon dioxide emission by adjusting the heating time and the flow rate of the high-temperature drying air. was difficult.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the laundry drying method which can reduce a carbon dioxide gas discharge | emission amount, without wasting heat energy.

  The present invention has been proposed in order to solve the above-mentioned problems. The first aspect of the present invention is that a rotating drum for storing laundry and high-temperature dry air generated by heating with a steam heat exchanger are provided. In the laundry drying apparatus, comprising a dry air introduction section for introducing into the rotary drum and an exhaust section for exhausting air in the rotary drum, the laundry housed in the rotary drum It is forcibly dropped in the rotating drum continuously by rotation, the high-temperature dry air is blown onto the laundry being dropped, the moisture is forcibly evaporated from the laundry, and the air is exhausted to the atmosphere through the exhaust part. In the laundry drying method, a temperature sensor is arranged in the dry air guide section or in the vicinity of the outlet thereof, the temperature of the high-temperature dry air supplied into the rotary drum is set, and temperature detection by the temperature sensor is not performed. Further, by adjusting the flow rate of steam flowing through the steam heat exchanger, the laundry drying method is characterized in that high temperature dry air is introduced into the rotating drum while maintaining the set temperature or a temperature in the vicinity thereof. is there.

  According to a second aspect of the present invention, in the first aspect, a part of the air exhausted from the rotating drum is circulated through the steam heat exchanger, and the circulating air and outside air are converted into high-temperature dry air. This is an inlet temperature controlled laundry drying method introduced into the rotating drum.

  The 3rd form of this invention is the inlet temperature control type laundry drying method which lowers | hangs the said preset temperature of the said high temperature dry air in multiple steps in the said 1st or 2nd form.

  The 4th form of this invention is an inlet temperature control type laundry drying method which reduces the flow volume of the said high temperature dry air in multiple steps in the said 1st, 2nd or 3rd form.

  A fifth aspect of the present invention is the laundry drying method according to any one of the first to fourth aspects, wherein the set temperature is in a range of 100 to 150 ° C.

  The sixth aspect of the present invention is the laundry drying method according to any one of the first to fifth aspects, wherein the temperature of the air in the exhaust section is in the range of 40 to 90 ° C.

  According to the first aspect of the present invention, the temperature of the high-temperature dry air supplied into the rotary drum is set, and the temperature is detected by the temperature sensor disposed in the dry air guide section or in the vicinity of the outlet thereof. By adjusting the flow rate of the steam supplied to the steam heat exchanger, the hot dry air is introduced into the rotating drum while maintaining the set temperature or a temperature in the vicinity thereof. The temperature control can be performed before the supply to the rotary drum. Compared to the case of measuring the temperature of the medium-humidity air that is exhausted in the past, it is not affected by the drying condition of the laundry and the heat distribution of the air in the rotating drum, and it is not necessary to oversupply high-temperature dry air Therefore, it is possible to supply a minimum amount of high-temperature dry air necessary for the drying process. Therefore, by appropriately supplying the high-temperature dry air according to the present invention, it is possible to efficiently use the heat energy given from the steam heat exchanger without wastefully supplying steam to the steam heat exchanger. Carbon dioxide discharged from the boiler can be greatly reduced.

  According to a second aspect of the present invention, in the first aspect, a part of the air exhausted from the rotating drum is circulated to the steam heat exchanger, and the circulating air and the outside air are converted into high-temperature dry air. Since it is converted and introduced into the rotating drum, the amount of heat given from the steam heat exchanger can be used with high efficiency, and the carbon dioxide discharged by the operation of the steam heat exchanger can be greatly reduced. it can. In the initial stage of drying of the laundry (at the start), the outside air that has passed through the steam heat exchanger is heated and sprayed on the laundry as high-temperature dry air, forcing moisture to evaporate, When the laundry is heated and the moisture contained therein begins to evaporate, it is quickly converted to medium and humid air that is circulated to the steam heat exchanger. The state of the intermediate temperature humid air is maintained for a relatively long time until the amount of moisture brought in by the laundry is significantly reduced by evaporative exhaust in the drying process. Rotating and dropping movements of the above are repeated, and a good texture (flexibility, bulkiness, etc.) can be imparted to the laundry.

According to the third aspect of the present invention, in the first or second aspect, the set temperature of the high-temperature dry air is lowered in a plurality of stages, so that the amount of water contained in the laundry is in accordance with the amount of water. The high-temperature dry air can be lowered stepwise, and the amount of heat given from the steam heat exchanger can be used with high efficiency. Furthermore, it is possible to supply the appropriate high-temperature dry air according to the drying conditions such as the amount and material of the laundry to be introduced.

According to the fourth aspect of the present invention, in the first or second aspect, since the flow rate of the high-temperature dry air decreases in a plurality of stages, the high-temperature dry air corresponding to the amount of water contained in the laundry is provided. And the laundry can be exchanged with high efficiency, and energy efficiency in the drying process can be improved. The flow rate of the high-temperature dry air can be adjusted by reducing the number of rotations of the exhaust fan in a plurality of stages, and the flow rate corresponding to the amount of moisture contained in the laundry is circulated from the boiler. The flow rate of steam supplied to the steam heat exchanger can be reduced. Therefore, the carbon dioxide gas discharged from the boiler can be greatly reduced.
Further, the stepwise lowering control of the high-temperature dry air flow rate makes it possible to supply the appropriate high-temperature dry air according to the drying conditions such as the amount and material of the laundry.

  According to the 4th form of this invention, since the said setting temperature exists in the range of 100-150 degreeC in the said 1st, 2nd or 3rd form, it is heated to 100 degreeC-150 degreeC, A required amount of high-temperature dry air suitable for drying can be supplied into the rotating drum.

  According to the fifth aspect of the present invention, in any one of the first to fourth aspects, the temperature of the air in the exhaust part is in the range of 40 to 90 ° C. It is possible to appropriately supply high-temperature dry air while discharging at a temperature suitable for drying.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a laundry drying apparatus using a laundry-like drying method according to the present invention will be described in detail with reference to the drawings. This laundry drying apparatus is a dryer for washing and drying dust control products such as rental mops, rental mats, and rental cloths.

  FIG. 1 is a schematic perspective view of a laundry drying apparatus 1 according to the present invention. The laundry drying apparatus 1 includes a drying unit 10, an air guide unit 25 connected to the drying unit, and an exhaust duct. The drying unit 10 includes a rotary drum 14 that houses the laundry. Yes. The low temperature outside air introduced into the air guide section 25 through the filter 28 is heated to 100 ° C. to 150 ° C. by a steam heat exchanger disposed in the air guide section 25 and converted into high temperature dry air, Introduced into the rotating drum 14.

  FIG. 2 is a schematic longitudinal sectional view of the laundry drying apparatus 1 according to the present invention. As described above, the air introduced from the air guide section 25 by the suction force of the exhaust fan 36 passes through the dust removal filter 28 and is heated to 100 ° C. to 150 ° C. in the steam heat exchanger 26. And converted to high temperature dry air. The high-temperature dry air is introduced into the drying unit 10 and guided to the rotating drum 14 through the introduction path 30. A wind guide temperature sensor 52 for measuring the temperature of the high-temperature dry air introduced into the rotary drum 3 is disposed in the introduction path 30.

  The wind guide temperature sensor 52 detects the temperature of the high-temperature dry air at a position close to the steam heat exchanger, and the detection output of the wind guide temperature sensor 54 is given to the control unit 50. The steam heat exchanger 26 is connected to a conduit 53 that supplies the steam generated in the steam generating section 56 (boiler) into the steam heat exchanger 26 and heats the low temperature outside air introduced from the air guide section 25. It is configured as follows. The steam generation unit 56 is connected to a water supply tank 37 via a water supply pump, and heated steam water is appropriately supplied from the water supply tank 37 to the steam generation unit 56 by the water supply pump. Further, a replenishment pipe 39 for replenishing supply water from the outside is connected to the water supply tank 37, and the drain warm water generated in the steam heat exchanger 26 is also recovered and connected to the water supply tank 37 for recovery.

  An electric valve 57 is provided in the middle of the conduit 53. The electric valve 57 controls the start / stop of steam supply and adjusts the steam flow rate. Accordingly, the opening / closing and opening area of the electric valve 57 is controlled by a signal from the control unit 50 based on the measured air guide temperature and the input set values (temperature, steam flow rate, time, etc.). Control of the heating temperature of the heat exchanger 26 is performed. For example, the temperature control is performed by lowering the flow rate of the steam supplied to the steam heat exchanger 26 in a plurality of stages at predetermined time intervals. Further, the motor of the exhaust fan 36 is also connected to the control unit 50, and the rotational speed of the motor is controlled by a signal from the control unit 50 based on the measured air guide temperature and the set rotational speed. it can. Further, when a computer is connected to the control unit 50, the heating temperature and the rotation speed of the motor can be controlled by a computer signal.

  The rotating drum 14 is supported in the rollers 40 and 40 and disposed in the outer drum 31. Further, the drying unit 10 is provided with driving means (not shown) for rotating the rotating drum 14. Further, the rotating drum 14 is provided with a mesh-like structure or a number of punch holes in order to introduce high-temperature dry air, exhaust medium-humidity humid air, and drain the moisture of the laundry 15 to the outside of the rotating drum 14. Have a structure. The laundry 15 accommodated in the rotating drum 14 is already in a state before drying after the washing, rinsing and dehydrating steps are completed in the charging stage. The rotational drive of the rotary drum 14 is set so that the laundry 15 is forcibly pulled up to the upper part of the rotary drum 14 and the laundry 15 is dropped when reaching the upper part. It is preferably pulled upward by a scraping member 14a provided on the inner surface of the rotating drum 14. The high-temperature dry air introduced into the rotary drum 14 is blown to the laundry 15 that is scraped up and dropped in the rotary drum 14, and the moisture of the laundry 15 is forcibly evaporated to dry it.

  FIG. 3 shows an example of a drying process by the laundry drying apparatus of this embodiment. The temperature of the high-temperature dry air introduced from the air guide passage 13 (introductory air temperature) is set to 100, 120, and 140 ° C., and the high-temperature dry air is supplied to the rotating drum 3 based on the laundry drying method and is dried. Processing was carried out. Compared with the conventional drying method based on the detected temperature of exhaust air. In the conventional example, 160 ° C. high-temperature dry air is continuously supplied so that the exhaust air temperature is 90 ° C. or lower. Assuming that the conventional steam usage is 100, the steam usage was reduced to 71, 81, 92 under the setting conditions of 100, 120, and 140 ° C. in the present embodiment. As described above, according to this embodiment, although the drying process time becomes long, the high-temperature drying necessary for the drying process is performed by introducing the high-temperature drying air into the rotating drum 3 while maintaining the set temperature or a temperature in the vicinity thereof. Air temperature control can be performed before the drum is supplied, and it is not affected by the drying condition of the laundry or the heat distribution of the air in the rotating drum, and it is not necessary to oversupply high-temperature dry air. The drying process can be completed by supplying a minimum amount of high-temperature dry air necessary for the drying process. Accordingly, it is possible to appropriately supply the high-temperature dry air, and the heat energy given from the steam heat exchanger 26 can be efficiently used without wasting it. When a heavy oil boiler or natural gas is used as a heat source, the fuel consumption can be reduced, and the carbon dioxide discharged by operation can be greatly reduced.

  Further, the set temperature of the high-temperature dry air may be lowered in a plurality of stages. FIG. 4 shows an example of a drying process when the set temperature is varied in two stages. When the introduction air temperature of the high-temperature dry air introduced from the air guide passage 13 is switched from, for example, 150 ° C. to 130 ° C. in the middle of drying, the 160 ° C. high-temperature dry air is reduced to an exhaust air temperature of 90 ° C. or less. Compared to the conventional steam usage 100 that continues to be supplied, it is 84 and less. Such a multi-stage lowering setting can realize a greater reduction in the amount of steam used as compared to the single setting of the high temperature shown in FIG. In addition, by the step-down of the set temperature, it is possible to supply appropriate high-temperature dry air according to the drying conditions such as the amount and material of the laundry. Note that this multi-step descent setting may be performed in three or more steps.

  Further, in addition to the supply control based on the introduction temperature of the high-temperature dry air, the flow rate of the high-temperature dry air is changed by changing the rotational speed of the exhaust fan 36 stepwise according to the amount of water contained in the laundry 15. As a result, the flow rate of the high-temperature dry air passing through the rotary drum 14 is reduced, and the high-temperature dry air and the laundry 15 are sufficiently brought into contact with each other. The amount reduction effect can be enhanced. When the rotational speed of the exhaust fan 36 is switched from about 2000 rpm to about 900 rpm in the middle of drying, the amount of steam used is 66 (compared to the conventional example) in FIG.

  In the laundry feeling drying apparatus of this embodiment, the exhaust air is circulated and used, so that the thermal efficiency is further improved and the wasteful consumption of thermal energy is further suppressed. Below, the exhaust air circulation system of this embodiment is demonstrated with reference to FIGS. As shown in FIG. 5, the exhaust air circulation system includes a circulation path 4, a drying unit 10, and an exhaust duct 16, and high-temperature dry air generated by heating is introduced into the drying unit 10 and used for a drying process. It is configured to circulate through the circulation path 4 medium-temperature humid air that is dried and dried and contains moisture. That is, the laundry drying apparatus 1 shown in FIG. 1 is provided with the circulation path 4 to configure the laundry feeling drying apparatus of FIG. 5, and the description of the parts common to FIG.

  The circulation path 4 is connected to the exhaust duct 32 and is composed of two circulation introduction parts 6 and circulation derivation parts 8, 8 installed symmetrically. For connection between the circulation derivation parts 8, 8 and the circulation introduction part 6. The connection member 23 is used, and the circulation deriving portion can be opened and closed as will be described later. The circulation path 4 may be an exhaust circulation device configured to be detachable from the circulation introduction portion 6 or may be integrally formed with the circulation introduction portion 11. In this embodiment, as will be described later, since the high-temperature dry air is introduced from two places, two circulation outlets 8 are provided. The amount of medium-temperature wet air circulated from the exhaust duct 16 to the circulation introduction unit 6 can be adjusted by a circulation flow rate adjusting means 16a provided in the exhaust duct 16, and the circulation flow rate adjustment means 16a includes an exhaust duct. The damper 20 which changes the opening area of 16 is arrange | positioned. Accordingly, the amount of circulation of the medium-temperature humid air circulated to the circulation introduction unit 6 can be freely adjusted by the damper 20, and when the opening area of the exhaust duct is reduced by the damper 20, the circulation path from the outside air introduction port 22. 4 is introduced outside air with low water content at low temperature. Furthermore, the circulation introduction unit 11 can be provided with a circulation amount adjusting means for adjusting the flow rate to the circulation deriving units 8, 8, and an operation member 24 for operating these circulation amount adjustment means is provided in the circulation introduction unit 6. It is also possible to adjust the circulation amount of the medium-humidity air as appropriate provided at the top. Therefore, by limiting the circulation amount of the medium-temperature humid air, a limited amount of outside air is introduced into the circulation path 4 from the outside air introduction port 22.

  FIG. 6 is a schematic perspective view of the laundry feeling drying apparatus 2 with the circulation path 4 removed. In the laundry feeling drying device 2, the laundry drying device 1 shown in FIG. 1 is provided with 16b, and the exhausted medium-temperature humid air is circulated. Moreover, in FIG. 6, the same code | symbol is attached | subjected about the common member with the laundry drying apparatus 1 of FIG. 1, and those description is abbreviate | omitted. Each air guide section 25 is composed of a steam heat exchanger 26 and a filter 28, and the air introduced into each air guide section 25 passes through the filter 28 for dust removal thread, thereby removing dust contained in the air and removing the air. The detached fibers can be removed, and dust and detached fibers can be prevented from adhering to the laundry. The air is a mixed air of medium-temperature humid air and outside air, and the mixed air contains dust from outside the apparatus. Further, the medium-temperature humid air exhausted from the circulation port 16b of the exhaust duct 16 passes through the dust removal filter, but may contain fine detached fibers.

  The mixed air that has passed through the filter 28 for dust removal yarn is introduced into the steam heat exchanger 26 and heated to 100 ° C to 150 ° C. Medium temperature humid air absorbs moisture evaporated from the laundry and is almost saturated. However, as will be described later, by heating the mixed air to 100 ° C. to 150 ° C., the contained water becomes superheated steam, and thus the circulated and heated mixed air can be used as suitable high-temperature dry air. Therefore, the high-temperature dry air converted in the steam heat exchanger 26 is introduced into the rotating drum 14 provided in the drying unit 10 and sprayed onto the laundry stored in the drum.

  FIG. 7 is a schematic vertical sectional view of the laundry-like drying apparatus according to this embodiment. As described above, the mixed air introduced from the air guide unit 25 by the suction force of the exhaust fan 36 passes through the dust removal filter 28 and is heated to 100 ° C. to 150 ° C. in the steam heat exchanger 26 to be a high temperature. Converted to dry air. The high-temperature dry air is introduced into the drying unit 14 and is guided to the rotating drum 3 through the introduction path 30. The rotating drum 3 is supported by the rollers 40 and 40 and disposed in the outer drum 31. Further, the drying unit 10 is provided with driving means (not shown) for rotating the rotary drum 14.

  The laundry 15 accommodated in the rotating drum 14 is already in a state before drying after the washing, rinsing, and dehydration steps are completed at the charging stage. The rotational drive of the rotary drum 14 is set so that the laundry M is forcibly pulled up to the upper part of the rotary drum 14 and the laundry M falls when reaching the upper part. It is preferably pulled upward by a scraping member 14a provided on the inner surface. The high-temperature dry air introduced into the rotating drum 14 is blown to the laundry M that is scraped up and dropped in the rotating drum 14, and the moisture of the laundry 15 is forcibly evaporated to dry it. Furthermore, since the high-temperature dry air is obtained by heating mixed air composed of medium-temperature humid air containing a larger amount of moisture than the outside air, it gives a good texture (flexibility, bulkiness, etc.) to the laundry 15 to be described later. It contains sufficient water vapor to contain the superheated water vapor.

  The high-temperature dry air absorbs moisture that is forcibly evaporated from the laundry 15, is cooled by contact with the laundry 15, becomes medium-humidity air of about 50 ° C. to 90 ° C., and is sucked by the exhaust fan 36 to remove dust. The air is introduced into the exhaust section 20 below the drum through the filter 38 for use. The dust generated from the laundry 15 that falls downward along with the medium temperature humid air and the detached fiber yarn are removed by the filter 38 for the dust removal thread, and the medium temperature humid air is exhausted to the exhaust duct 16 by the exhaust fan. The

  FIG. 8 is a schematic cross-sectional view of the circulation path 4 and the air guide portion 25. The intermediate temperature humid air rises up the exhaust duct 16, and a part thereof flows into the circulation introducing portion 6 from the circulation port 16b and is circulated again to the air guide portion 25 through the circulation passage ports 6b and 8b. The remainder of the humid air is discharged from the exhaust duct into the atmosphere. The circulation introduction part 6 constituting the circulation path 4 is provided with dampers 42 and 42 having variable opening areas as circulation flow rate adjusting means at the circulation passage 6b. The operation members 24 and 42 of the dampers 42 and 42 are provided with the dampers 42 and 42, respectively. 24 (see FIG. 5) can be operated to adjust the circulation amount of the medium-temperature humid air. Therefore, the amount of circulation is controlled by the rotational speed of the exhaust fan 36, the damper 20 of the exhaust duct 16, and / or the opening area of the dampers 42, 42 in the circulation path 9 and the opening area of the outside air inlets 22, 22.

  FIG. 9 is a schematic cross-sectional view of the circulation path 9 and the air guide portion 25. The circulation outlets 8 and 8 are connected to the circulation inlet 6 by a connecting member 23 so as to be freely opened and closed. By opening the circulation outlets 8 and 8, the dust removal filter 28 can be easily cleaned, removed or replaced, and by removing the filter 28, the steam heat exchanger can be cleaned, inspected and repaired. Etc. can be performed easily.

FIG. 10 is a graph showing the temperature dependence of the saturated water vapor amount in the air. In the figure, the water vapor weight in a saturated state for each temperature is plotted. As shown in the figure, water vapor exists in the air even at a boiling point (100 ° C.) or higher, and such water vapor at 100 ° C. or higher is generally called “superheated water vapor”. The medium temperature humid air contains a larger amount of water vapor than the outside air. When this water vapor is heated to 100 ° C. or higher, it becomes superheated water vapor, and when it comes into contact with the laundry, the superheated water vapor liquefies on the laundry surface. Heat exchange with the laundry (called “condensation heat transfer effect”), the laundry can be heated with high efficiency. Further, the temperature of the medium-humidity air that has been sprayed on the laundry, contains water, and is cooled is about 50 ° C. to 90 ° C. Even if the medium-temperature humid air is saturated, it is contained per 1 m ^3. steam weight that is 160g ^{/ m 3} ~850g ^/ m 3 approximately from temperature dependency. In the steam heat exchanger, when the saturated medium temperature humid air is heated to high temperature dry air of 100 ° C. to 150 ° C., the high temperature dry air of 100 ° C. to 150 ° C. is about 1630 g / m ^{3 to} 5100 g / m ³ or more. The ability to contain water vapor is provided. Therefore, even intermediate temperature humid air before heating include 160g ^{/ m 3} ~850g ^/ m 3 approximately steam, 100 ° C. to 150 DEG ° C. Fast dry air which has been heated to about 1630g ^{/ m 3} ~5100g ^/ m 3 Since the above water vapor can be contained, the laundry can be sufficiently dried.

Next, the fact that the moisture of the laundry can be suitably discharged outside the apparatus by exhausting a part of the medium-temperature humid air that is exhausted will be described using the following example. For example, the water evaporated from the laundry is about 80 kg, and the exhaust amount of exhaust air at 70 ° C. exhausted from the conventional one-pass type (100% exhaust) laundry drying device to the outside of the device is about 340 m ³ / If a minute, the emissions to be exhausted in 30 minutes, from the 340m ³ / min × 30 min = 10200m ^3, the water content of the conventional exhaust ^{air, 80kg / 10200m 3 = 7.8g /} m 3 It becomes. As shown in FIG. 10, since the saturated water vapor amount at 70 ° C. is 400 g / ^{m 3,} a humidity of conventional exhaust ^air, and ^{7.8g / m 3 / 400g / m} 3 × 100 = 1.95% It can be estimated and the conventional exhaust air is very dry. (When outside humidity is not considered)

On the other hand, when the medium-temperature humid air at 70 ° C. is circulated by 95% using the laundry-like drying apparatus according to the present embodiment, the exhaust amount is 1/20 of the one-pass type. Assuming that it is multiplied by a factor of 5, the displacement for 45 minutes is 340 m ³ / min × 1/20 × 45 minutes = 765 m ³ , and the moisture content of the medium-humid air exhausted is 80 kg / 765 m ³ = 105 g / m ³ Therefore, since the saturated water vapor amount at 70 ° C. is 400 g / m ³ , the humidity of the exhausted medium-temperature humid air can be estimated as 105 g / m ³ ÷ 400 g / m ³ × 100 = 26.3%. As described above, even in the 95% circulation, the moisture content of the medium temperature humid air is equal to or less than the saturated water vapor amount, and it can be understood that the moisture contained in the laundry can be discharged outside the apparatus if the exhaust time is about 1.5 times. . Further, if this medium temperature humid air is heated to produce 150 ° C. high temperature dry air, the saturated water vapor amount at 150 ° C. is 5100 g / m ³ as shown in FIG. 105 g / ^{m 3} was estimated to ^{÷ 5100g / m 3 × 100 =} 2.06%, it can be seen that suitably perform the drying of the laundry.

  By providing the exhaust air circulation system with the above configuration, for example, when the circulation rate is 85% to 99%, the energy efficiency is about twice that of the one-pass method, and accordingly, the circulation rate of the medium-humidity humid air is increased. Thus, high-temperature dry air containing a large amount of superheated steam can be generated, and in addition to the supply of high-temperature dry air by setting the temperature of the introduced air, further energy-saving drying can be realized. In addition, a good texture (finishedness of drying) can be obtained by circulating and using the exhaust air.

  The present invention is not limited to the above-described embodiment, and various modifications, design changes, and the like within the scope not departing from the technical idea of the present invention are included in the technical scope. Absent.

  The laundry-like drying method and laundry-like drying apparatus according to the present invention include dust control products such as mops and mats, textile products such as towels, sheets, handkerchiefs, underwear, linens such as cloth and apron, and other clothing items. If it uses for the drying process of the laundry which consists of, the energy efficiency of a drying process can be improved and a carbon dioxide gas discharge | emission amount can be reduced significantly.

1 is a schematic perspective view of a laundry feel drying apparatus according to the present invention. It is a schematic block diagram of the laundry feeling drying apparatus which concerns on embodiment of this invention. It is a table | surface which shows the comparative example of the drying process by the said laundry feeling drying apparatus. It is a table | surface which shows another comparative example of the drying process by the said laundry feeling drying apparatus. It is a schematic block diagram of the exhaust air circulation system in the laundry feel drying apparatus of FIG. FIG. 6 is a schematic perspective view of the laundry-like drying apparatus when the circulation path is removed in FIG. 5. It is the longitudinal cross-sectional schematic of FIG. FIG. 6 is a schematic cross-sectional view of the circulation path and the air guide portion in FIG. 5. FIG. 6 is a schematic cross-sectional view of the circulation path and the air guide portion in FIG. 5. It is the graph which showed the temperature dependence of the saturated water vapor amount in the air. It is the structure schematic of the conventional laundry drying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laundry drying apparatus 2 Laundry feel drying apparatus 4 Circulation path 6 Circulation introduction part 6b Circulation passage port 8 Circulation outlet part 8b Circulation passage port 10 Drying part 14 Rotating drum 15 Laundry 16 Exhaust duct 16a Circulation flow rate adjustment means 16b Circulation Port 18 Input port 20 Damper 22 Outside air introduction port 23 Connecting member 24 Operation member 25 Air guide part 26 Steam heat exchanger 28 Filter 30 Introduction path 31 Outer trunk 34 Air exhaust part 34a Drain part 36 Exhaust fan 40 Roller 42 Damper 50 Control Unit 52 wind guide temperature sensor 53 conduit 55 circulation pump 56 steam generating unit 57 electric valve 102 laundry drying device 113 punch hole 114 rotating drum 115 laundry 125 wind guide unit 126 steam heat exchanger 131 outer trunk 134 exhaust duct 138 lint removal Car 140 Roller 170 Buri 171 Drum motor 173 Belt

Claims (6)

  A rotating drum for storing laundry, a dry air introduction section for introducing high-temperature dry air heated and generated by a steam heat exchanger into the rotating drum, and an exhaust section for exhausting the air in the rotating drum. In the laundry drying apparatus, the laundry stored in the rotary drum is forced to drop continuously in the rotary drum by the rotation of the rotary drum, and the hot dry air is sprayed on the laundry being dropped. A laundry drying method for forcibly evaporating moisture from the laundry and exhausting it into the atmosphere through the exhaust part, wherein a temperature sensor is disposed in or near the outlet of the dry air guide part, and the rotating drum The temperature of the high-temperature dry air supplied to the inside is set, and while the temperature is detected by the temperature sensor, the flow rate of the steam flowing through the steam heat exchanger is adjusted to adjust the set temperature or the temperature. Inlet temperature controlled laundry drying method characterized by and maintained at a temperature in the vicinity of introducing hot dry air into the rotating drum.   The inlet temperature control according to claim 1, wherein a part of the air exhausted from the rotating drum is circulated through the steam heat exchanger, and the circulating air and outside air are converted into high-temperature dry air and introduced into the rotating drum. Mold laundry drying method.   The inlet temperature controlled laundry drying method according to claim 1 or 2, wherein the set temperature of the high-temperature drying air is lowered in a plurality of stages.   The inlet temperature-controlled laundry drying method according to claim 1, 2, or 3, wherein the flow rate of the high-temperature drying air is decreased in a plurality of stages.   The inlet temperature-controlled laundry drying method according to any one of claims 1 to 4, wherein the set temperature is in a range of 100 to 150 ° C.   The inlet temperature controlled laundry drying method according to any one of claims 1 to 5, wherein the temperature of the air in the exhaust section is in the range of 40 to 90 ° C.

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