JPH0678786U - Wood dryer - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Wood that has been dried to a specified water content in the drying box is allowed to cool to the outside air temperature in the drying box, and cracks when removed from the drying box. Prevents bending and distortion. [Structure] A substantially sealed drying box 1 for containing wood, an air blower 2 for generating an air flow in the drying box, an indirect heating device 3 for heating the inside of the drying box, and a humidity of air in the drying box. In a wood dryer provided with a dehumidifying device 4 for reducing the above, an indirect cooling device 5 for cooling the inside of the drying box is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wood dryer for artificially drying wood.

[0002]

[Prior art]

 As a conventional technique, there is one shown in FIG. In FIG. 3, reference numeral 1 denotes a substantially closed dry box having a rectangular parallelepiped shape, the front part of which is opened and closed by a door (not shown) and accommodates the wood 15 mounted on the carriage 14 from the front part side. An air blower 2 is provided in the upper part of the drying box 1, and a heating device 3 composed of an electric heater is arranged downstream of the air blower 2 to heat the air flow generated by the air blower 2, that is, the air. Further, a dehumidifying device 4 is installed outside the drying box 1, and the dehumidifying device 4 suppresses an increase in air humidity inside the box to a predetermined value.

Reference numeral 8 denotes a control device that controls the heating device 3 and the dehumidifying device 4, and turns on the switch 2a of the blower device 2 in the drying process, and also provides a temperature sensor 9 and a humidity sensor provided in the drying box 1. By inputting the measured value of 10 and turning on / off the switches 3a and 4a of the heating device 3 and the dehumidifying device 4, for example, the temperature of the air in the drying box 1 during the drying is indicated by the temperature characteristic line 11 in FIG. As shown, the humidity of the air in the drying box 1 during the above-mentioned drying is kept at about 70% as shown by the humidity characteristic line 12 in FIG. The moisture of 15 is dried until it reaches, for example, 20% as shown by the moisture characteristic line 13 of FIG.

Further, a plurality of ventilation windows 1a are attached to the peripheral wall of the drying box 1, and when the wood 15 in the drying box 1 reaches a predetermined water content, for example, 20%, the heating device 3 and the dehumidifying device 3 are stopped. After that, the ventilation window 1a is opened as shown by the phantom line in FIG. 1 to introduce the outside air, and the temperature of the wood 14 in the dry box 1 is lowered to the outside air temperature.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned conventional apparatus, after drying the wood 15 in the drying box 1 to a predetermined moisture content, the ventilation window 1a is opened to introduce outside air into the drying box 1, that is, When entering the cooling process, the temperature and humidity of the air in the dry box 1 rapidly drop to the temperature and humidity of the outside air at time T3, as shown by the falling temperature characteristic line 11a and the falling humidity characteristic line 12a in FIG. However, there is a drawback that the wood 15 is cracked, bent, or distorted due to a sudden change in the atmosphere. Further, in order to prevent this, the opening of the ventilation window 1a is manually adjusted according to the temperature and humidity of the outside air, but this has the drawback of requiring skill. An object of the present invention is to obtain a new wood dryer that solves the above drawbacks.

[0006]

[Means for Solving the Problems]

 The present invention is configured as follows in order to achieve the above object. That is, a substantially sealed drying box that contains wood, an air blower that generates an air flow inside the drying box, an indirect heating device that heats the inside of the drying box, and dehumidification that reduces the humidity of the air inside the drying box. In the wood dryer provided with the device, an indirect type cooling device for cooling the inside of the drying box is provided. Further, the air blower, the heating device, and the dehumidifying device are operated to dry the wood in the drying box, and when the wood reaches a predetermined water content, the heating device is stopped and the cooling device is operated. The configuration is such that a control device is provided.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the figure, FIG. 1 is a sectional front view of an essential part showing an embodiment of the present invention, and FIG. 2 is a characteristic diagram. In FIG. 1, reference numeral 1 is a drying box for accommodating wood 15 to be dried, which is mounted on a trolley 14. An air blower 2 and a heating device 3 are installed inside, and a dehumidifier 4 is installed outside to blow air. The device 2 circulates the air in the dry box 1, the heating device 3 heats the air in the dry box 1 to a predetermined temperature, and the dehumidifier 4 raises the air humidity in the dry box 1 to a predetermined value. Suppress to. These have substantially the same structure as the above-mentioned conventional one.

A cooling device 5 for cooling the air in the drying box 1 is provided. In this cooling device 5, a cooling pipe 6a is arranged on the air circulation path in the upper part of the drying box 1, a supply pipe 6b through which ground water or tap water flows is connected to one end of the cooling pipe 6a, and a drain pipe 6c is connected to the other end. Connect. A solenoid valve 7 is attached to the supply pipe 6b, and the supply pipe 6b is opened and closed by the solenoid valve 7. The cooling device 5 may be a circulation heat radiation type cooling device in which a water tank and a radiator are installed outside and heat is radiated by the radiator while circulating water in the water tank, or refrigeration using a refrigerator. It may be a mechanical cooling device.

The heating device 3, the dehumidifying device 4 and the cooling device 5 are controlled by the control device 8 as follows. That is, in the drying process, the solenoid valve 7 of the cooling device 5 is turned off (shut off), the switch 2a of the blower device 2 is turned on, and the measured values of the temperature sensor 9 and the humidity sensor 10 provided in the drying box 1 are measured. (Signal) is input, and when the measured value is, for example, 50 ° C. or 70% or less, the switches 3a and 4a of the heating device 3 and the dehumidifying device 4 are turned on, and the measured value is 50% or less. When the temperature exceeds 70%, the switches 3a and 4a of the heating device 3 and the dehumidifying device 4 are turned off, and the temperature and humidity of the air in the drying box 1 in the drying step are shown by the temperature characteristic line 11 in FIG. As shown by the humidity characteristic line 12, the temperature is kept at about 50 ° C. and about 70%, whereby the wood 15 in the drying box 1 is dried until it reaches, for example, 20% as shown by the moisture characteristic line 13 in FIG. Let The time T1 of this drying process is performed by a preset timer circuit (not shown). The set temperature and set humidity of the temperature sensor 9 and the humidity sensor 10 are appropriately set according to the type of wood 15.

Next, when the drying process is completed, the cooling process is started. That is, the switch 3a of the heating device 3 is turned off, the switch 2a of the blower device 2 is turned on (continued), and the solenoid valve 7 is turned on and off intermittently at preset time intervals to cool the cooling pipe. When the cooling water is intermittently circulated in 6a and the measured value of the temperature sensor 9 reaches the outside air temperature, for example, 20 ° C., the solenoid valve 7 is turned off. The interval of the on / off operation of the solenoid valve 7, that is, the cooling capacity of the cooling device 5 is such that the temperature of the air in the drying box 1 is the outside temperature (20 ° C.) as shown by the falling temperature characteristic line 11b in FIG. ) Is set so that the time T2 until it reaches) is about 24 hours. The cooling capacity of the cooling device 5, that is, the time T2 of the cooling process is set as appropriate according to the type of wood 15.

In the cooling step, when the measured value of the humidity sensor 10 provided in the drying box 1 is, for example, 70% or less, the switch 4a of the dehumidifier 4 is turned on, and the measured value is However, when it becomes 70% or more, the switch 4a of the dehumidifying device 4 is turned off, so that the humidity of the air in the drying box 1 in the cooling step becomes about 70% as shown by the humidity characteristic line 12b in FIG. In this state, the temperature of the wood 15 in the drying box 1 is lowered to the outside temperature. The operation of the dehumidifying device 4 in the cooling step may be stopped.

[0012]

[Effect of device]

 As is clear from the above description, the present invention lowers the temperature of the wood, which has been dried to a predetermined water content in the drying box, to the outside temperature without lowering the humidity of the air in the drying box. When the dried wood is taken out of the drying box, cracks, bends, distortions, etc. will not occur, and the dried wood can be easily cooled without requiring skill.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part.

FIG. 2 is a characteristic diagram of water content of wood and temperature and humidity in a drying box.

FIG. 3 is a sectional front view of a main part showing a conventional example.

[Explanation of symbols]

 1 Dry Box 2 Blower 2a Switch 3 Heating 3a Switch 4 Dehumidifier 4a Switch 5 Cooling 6a Cooling Pipe 6b Supply Pipe 6c Drain 7 Solenoid Valve 8 Controller 9 Temperature Sensor 10 Humidity Sensor 11 Temperature Characteristic Line 11b Falling Temperature Characteristic Line 12 Humidity characteristic line 12b Humidity characteristic line of cooling process 13 Wood Moisture characteristic line 14 Bogie 15 Wood

Claims (2)

[Scope of utility model registration request] 1. A substantially sealed drying box containing wood,
In a wood dryer provided with an air blower for generating an air flow in the drying box, an indirect heating device for heating the inside of the drying box, and a dehumidifying device for reducing the humidity of the air in the drying box,
A wood dryer comprising an indirect cooling device for cooling the inside of the drying box. 2. The blower, the heating device, and the dehumidifying device are operated to dry the wood in the drying box, and when the wood reaches a predetermined water content, the heating device is stopped and the cooling device is used. The wood dryer according to claim 1, further comprising a control device for operating the wood dryer.