JPS6155399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dryer that dries objects to be dried by circulating hot air.

Conventionally, for example, in a clothes dryer that stores clothes in a rotating drum and dries the clothes while rotating the rotating drum, outside air is heated by a heater to hot air and is blown into the rotating drum. However, the hot air that has removed moisture from clothing is directly released outside the aircraft as exhaust air. However, according to such a conventional structure, because the temperature of the hot air supplied into the rotating drum is relatively low or because it is immediately exhausted as exhaust air, the absolute amount of moisture that the hot air can take away from clothing is small. It has the disadvantages of low drying efficiency, long drying time, and high power consumption.
Furthermore, since the moisture contained in the exhaust air is directly released into the room, there are also problems such as the walls of the room near the exhaust port becoming damp and moldy.

The present invention has been made in view of the above circumstances, and its object is to provide a first fan that circulates hot air within a drying chamber, and a second fan that is operated intermittently to replace the air inside the drying chamber with outside air. By providing a heat exchanger for exchanging heat between the intake air and exhaust air from the second fan in the exhaust path from the drying chamber to the second fan, drying efficiency can be significantly improved and consumption can be reduced. The power consumption can be drastically reduced, the items to be dried can be dried in a short time, and the moisture in the exhaust gas emitted into the room can be reduced as much as possible, preventing mold from forming on the walls of the room. An object of the present invention is to provide a dryer that can significantly improve the efficiency of a heat exchanger.

An embodiment of the present invention will be specifically described below with reference to the drawings. Reference numeral 1 denotes an outer box, the back opening 2 of which is removably closed by a back plate 4 in which a protrusion hole 3 is formed, and a door receiving recess 6 that matches the door 5 is formed on the front surface. A short cylindrical clothing loading/unloading opening 7 is formed in the housing. Reference numeral 8 denotes a rotating drum with a drying chamber 8a inside, which is formed by a cylindrical wall 9, a rear end plate 10, and a front end plate 11, and the cylindrical wall 9 scoops up dry matter and agitates it by falling. A plurality of buffs 12 are formed to protrude inward. In addition, the front end plate 1
An opening 13 communicating with the clothing opening 7 is formed in the central region of the cylindrical clothing opening 7. During the formation process, a rotary receiving part 14 formed around the periphery of the opening 13 is mounted on the outer periphery of the cylindrical clothing opening 7 using a well-known bearing. It is fitted and supported via a member 15. On the other hand, a bulging wall portion 16 that bulges inward is formed in a portion of the rear end plate 10 that faces the opening 13.
The circumferential area near the outer periphery of the cylindrical wall 9 is an inclined annular portion 17 that diagonally faces the inner circumferential surface of the cylindrical wall 9. A large number of ventilation holes 17a are formed in this inclined annular portion 17, and an expanded A large number of ventilation holes 16a are also formed in the central region of the projecting wall portion 16. Reference numeral 18 denotes an auxiliary casing in the shape of a circular shallow container for forming a fan chamber 19 with the bulging wall 16. The auxiliary casing 18 is in the shape of a circular shallow container for forming the fan chamber 19 with the bulging wall 16. It is connected to the support plate 21 via the connecting member 18a so as to be in a fitted state.
As shown in FIG. 2, both ends of the support plate 21 are connected to the opening edge of the rear opening 2 of the outer box 1 at the middle portion thereof by screwing means. One end of a rotary shaft 22 is rotatably supported by a shaft support member 23 in a cantilevered state in the middle portion of the support plate 21, and the other end of the rotary shaft 22 extends horizontally into the opening of the auxiliary shaft casing 18. 24 and reaches the center of the bulging wall portion 16, which is the center of rotation of the rotating drum 8, and is connected to this portion by a connecting member 25 so as to rotate together with the rotating drum 8. A rotation center portion of a circulation fan 26 corresponding to a first fan located in the fan chamber 19 is rotatably supported on the rotation shaft 22, and
A driven pulley 27 that rotates substantially integrally with the circulation fan 26 is located outside the fan chamber 19 and rotatably supported by the rotating shaft 22. An electric heater 28 is arranged in the fan chamber 19 around the space in which the circulation fan 26 is disposed, and the auxiliary casing 18 is surrounded by the electric heater 28 .
An internal air intake hole 29 is formed therein. 30 is a main motor, a pulley 31 is connected to one end of the motor shaft, and a belt 32 is placed between the pulley 31 and the driven pulley 27. Reference numeral 33 denotes a belt for driving the rotating drum 8, which is hung between a pulley (not shown) provided at the other end of the motor shaft of the main motor 30 and the outer periphery of the cylindrical wall 9. A well-known tension pulley mechanism 34 that applies tension to the belt 33 is provided. 35 is a small output type auxiliary motor, and a suction/exhaust fan 36 corresponding to a second fan is attached to the motor shaft of this motor.
are connected. And this suction/exhaust fan 3
6 is disposed in a fan casing 39 that communicates with a suction duct 37 formed at the front lower part of the outer box 1 through an inlet 38, and is connected to an outlet formed in a side wall of the fan casing 39. A substantially horizontally arranged exhaust duct 40 is communicated with the exhaust duct 40 , and the rear end of the exhaust duct 40 slightly projects outside the outer box 1 through the projection hole 3 . A circular protrusion 42 is formed on the inner plate 41 of the door 5 and projects into the clothing opening 7, and an internal exhaust passage 43 is formed between the outer periphery of the protrusion 42 and the inner circumferential surface of the clothing opening 7. . Reference numeral 44 denotes an air guiding path that communicates with the internal exhaust path 43 via a filter 45, and although not shown, it connects the internal exhaust path 43 to the suction duct 37. Reference numeral 46 denotes a heat exchanger consisting of a plurality of ventilation pipes 47 and a plurality of fins 48 attached at a predetermined distance from each other so as to be perpendicular to the ventilation pipes 47. Both ends of the ventilation pipes 47 are connected to the suction The end plates 49 and 50 provided in the middle part of the duct 37 communicate with each other, and the intake passage 5 is sandwiched between the end plates 49 and 50 and is perpendicular to the intake duct 37.
One end of the air intake passage 51 is connected to an external air intake port 52 provided below the door receiving recess 6, and the other end of the air intake path 51 and the internal air intake hole 29 are connected by an air intake duct 53. 54 is a grill fitted to the external intake port 52;
55 is a drain pipe connected to the heat exchanger 46 at the lower part of the suction duct 37, and 56 is a timer that turns on and off the electric heater 28, main motor 30, and auxiliary motor 35 according to the time chart shown in FIG. It is something to control.

Next, the operation of this embodiment configured as above will be explained. When the door 5 is opened and wet clothes are stored in the rotary drum 8, the door 5 is closed and the timer 56 is set, the main motor 30 and the electric heater 2 are turned off as shown in the time chart of FIG.
8 is energized. Then, the rotating drum 8 and the circulation fan 26 are rotationally driven by the main motor 30, and the electric heater 28 becomes in a heat generating state. When the rotary drum 8 is rotated, the clothes inside it are scooped up by the baffle 12 and are agitated. At the same time, the air in the drying chamber 8a is moved to the arrow 57 by the action of the circulation fan 26.
The air is sucked into the fan chamber 19 through the ventilation hole 16a located approximately in the center as shown in FIG. That is, circulating air is generated that is blown out near the inner side of the cylindrical wall 9 of the rotating drum 8 and circulates within the drying chamber 8a, and the circulating air is constantly reheated by the electric heater 28. That is, timer 5
As is clear from the time _chart , the auxiliary motor 35 that drives the suction/exhaust fan 36 stops operating, and the main motor 30
Since only the circulation fan 26 is operated by the electric heater 28, and the above-mentioned circulating air is heated while repeatedly passing around the electric heater 28, the temperature inside the drying chamber 8a is plotted on the vertical axis and on the horizontal axis. As shown in the temperature characteristic curve of FIG. 3, the temperature rises at a relatively high rate and reaches, for example, 70° C. at time _t1 . Now, at time _t1 , the auxiliary motor 35 is energized by the timer 56 and the intake/exhaust fan 36 is rotated, so that external air is sucked into the intake passage 51 via the external intake port 52, and the heat exchanger 46 The fan chamber 19
Thereafter, it is energized by the circulation fan 26, passes around the electric heater 28, and is supplied into the drying chamber 8a from the vent 17a as shown by the arrow 58 while being heated. Then, the same volume of air as the air supplied into the drying chamber 8a is transferred to the internal exhaust passage 43.
The air is sucked into the suction duct 37 through the air guide path 44 having the filter 45, and then passes through the air pipe 47 and suction port 38 of the heat exchanger 46 disposed inside the suction duct 37 in order to be drawn into the fan casing 39.
and this fan casing 3
9 is exhausted to the outside of the outer box 1 via the exhaust duct 40. Therefore, the external intake port 5 is connected from the outside of the outer box 1.
2 to the ventilation pipe 47 of the heat exchanger 46.
The intake air flowing around the fins 48 has a low temperature approximately equal to room temperature, whereas the exhaust air discharged from the drying chamber 8a and flowing through the vent pipe 47 of the heat exchanger 46 has a low temperature as described above. Since the temperature is as high as approximately 70° C., the heat exchanger 46 effectively exchanges heat between the intake air and exhaust air, heating the intake air and cooling the exhaust air. and,
The exhaust air from the drying chamber 8a is humid because it contains a lot of moisture taken from the clothes in the drying chamber 8a, so when it is cooled by the heat exchanger 46, dew condenses on the inner surface of the vent pipe 47. Therefore, the moisture in the exhaust air is effectively removed by the heat exchanger 46, and the latent heat released when the moisture condenses efficiently heats the intake air. In addition, water droplets generated due to dew condensation on the heat exchanger 46 are removed from the drain pipe 55.
It is discharged to the outside of the outer box 1 through. When the suction/exhaust fan 36 is operated by the auxiliary motor 35 in this manner, the circulating air that has taken moisture from the clothes in the drying chamber 8a and has become humid is discharged outside the drying chamber 8a, and a proportionate amount of outside air is generated. The air is supplied into the drying chamber 8a, and the inside of the so-called drying chamber 8a is ventilated, and at time _t2 , the auxiliary motor 35 is cut off and the ventilation ends. After time _t2 , the auxiliary motor 35 is intermittently energized a predetermined number of times, and the suction/exhaust fan 36 is operated intermittently at predetermined time intervals. And time t ₃
When the drying time is reached, the clothes in the drying chamber 8a finish drying, but at this time, the electric heater 28 is cut off and the auxiliary motor 35 is continuously energized instead.
That is, at this point, since the main motor 30 continues to operate, the outside air supplied into the drying chamber 8a through the above-mentioned route is not heated by the electric heater 28 and is dried as shown by the arrow 58. Since it is supplied into the drying chamber 8a and stirred in the drying chamber 8a, it removes heat from the clothes and is further discharged to the outside from the exhaust duct 40 through the above-mentioned route, so that the dried clothes are cooled to near room temperature. . and time t ₄
At this point, the main motor 30 and the auxiliary motor 35 are cut off, and the entire process of the drying operation is completed.

By the way, the conventional dryer is not provided with a fan corresponding to the circulation fan 26 of the present embodiment, and a fan corresponding to the suction/exhaust fan 36 is constantly operated to ventilate the inside of the rotating drum. The frequency of contact between the hot air heated by the rotating drum and the clothes being agitated in the rotating drum is low, and the hot air that passes through the rotating drum is immediately released to the outside as exhaust gas, causing the temperature inside the rotating drum to rise to the level shown in Figure 3. As shown by the broken line, since it is as low as 30 degrees Celsius, the amount of moisture that the hot air supplied to the rotating drum per unit volume can remove from clothing is small, and according to experiments, it accounts for 25 to 35% of the total amount of heat supplied by the heater. The reason for this is that the waste is discarded outside along with the exhaust air without contributing to the drying of clothes.

However, in this embodiment, since the suction/exhaust fan 36 is operated intermittently and the circulation fan 26 is constantly operated, the circulation generated by the circulation fan 26 when the suction/exhaust fan 36 is stopped. The air is repeatedly heated by the electric heater 28 and repeatedly comes into contact with the clothes in the drying chamber 8a, and the air taken into the drying chamber 8a is sufficiently heated by the heat exchanger 46 by the exhaust air from the drying chamber 8a. Therefore, the temperature inside the drying chamber 8a can be raised sufficiently compared to the conventional structure without increasing the capacity of the electric heater 28, and the moisture from the clothes can be actively evaporated. The heat discharged outside the box 1 can be reduced as much as possible, the drying efficiency can be significantly improved, and the drying can be completed in a short time.

Further, since the moisture in the exhaust air from the drying chamber 8a is partially condensed and removed when passing through the heat exchanger 46, the moisture discharged into the room from the exhaust duct 40 is significantly less than in the conventional structure. Furthermore, since the air is only exhausted intermittently, mold does not form on the walls of the room.

Now, in the above embodiment, the heat exchanger 46 is located in the suction duct 37 which is the suction side of the suction/exhaust fan 36. The efficiency of heat exchange between the intake air and the exhaust air is significantly increased compared to the case where the intake air and the exhaust air are provided. That is, FIG. 5 is an experimental comparison of the characteristics when the heat exchanger 46 is provided on the suction side or the discharge side of the suction/exhaust fan 36.
The vertical axis shows the pressure P, and the horizontal axis shows the air flow Q. Pi and Ri are the heat exchangers 46 and 36
Po and Ro are pressure curves and resistance curves when the heat exchanger 46 is installed on the suction side of the suction/exhaust fan 36; Air flow rate Qi when the heat exchanger 46 is installed on the suction side of the suction/exhaust fan 36
is larger than the amount of air blown Qo when the heat exchanger 46 is provided on the discharge side of the suction/exhaust fan 36. on the other hand,
The efficiency α of the heat exchanger 46 is proportional to the air flow rate Q, as is clear from the characteristic curve in FIG. 6, which shows the efficiency α on the vertical axis and the air flow rate Q on the horizontal axis. Efficiency α when installed on the suction side of 36
i is higher than the efficiency αo when the heat exchanger 46 is provided on the discharge side of the suction/exhaust fan 36.

Furthermore, if the heat exchanger 46 is provided on the discharge side of the suction/discharge fan 36, the high temperature discharge from the drying chamber 8a becomes a turbulent flow within the fan casing 29, and the heat exchanger 46
Until this point is reached, a large amount of heat is radiated from the surface of the fan casing 29, and the amount of heat given to the intake air is reduced. The heat exchanger 46 immediately exchanges heat with the intake air, and the heat radiation until reaching the heat exchanger 46 is extremely small, so the heat exchange efficiency is even higher.
If the heat exchanger 46, which acts as a resistance to the
By disposing the auxiliary motor 35 on the suction side of the suction/exhaust fan 36 as in this embodiment, the required power of the auxiliary motor 35 is reduced, and the power consumption of the auxiliary motor 35 is reduced. Fever generation may also be reduced.

In the above embodiment, the operation of the suction/exhaust fan 36 as the second fan is controlled intermittently by the timer 56. Intermittent operation may be controlled by a thermoswitch.

As is clear from the above description, the present invention repeatedly heats the circulating air circulated in the drying chamber by the first fan using the heater, so that the temperature of the drying chamber can be raised sufficiently and the temperature of the drying chamber can be increased sufficiently. It is possible to accelerate the evaporation of moisture from objects, and the second fan intermittently replaces the air inside the drying chamber with outside air, and the heat exchanger installed in the exhaust path from the drying chamber to the second fan The second fan allows the intake air and exhaust air to exchange heat with each other to prevent wasteful release of thermal energy as much as possible, and to reduce moisture in the exhaust air as much as possible, so overall drying efficiency is improved. It is possible to provide a dryer that can significantly improve the efficiency of a heat exchanger, can dry objects to be dried in a short time, does not cause mold to form on the walls of the chamber, and can significantly improve the efficiency of a heat exchanger.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view, FIG. 2 is a rear view with the back plate removed, FIG. 3 is a temperature characteristic diagram, and FIG. 4 is a diagram of FIG. 1. 5 is a diagram showing air blowing characteristics, and FIG. 6 is a diagram showing heat exchange characteristics. In the drawing, 8 is a rotating drum, 8a is a drying chamber, 26
is a circulation fan (first fan), 28 is an electric heater, 30 is a main motor, 35 is an auxiliary motor, 36
37 is a suction duct, 46 is a heat exchanger, and 56 is a timer.

Claims (1)

[Claims] 1 A first fan that generates circulating air in the drying chamber; a heater that heats the circulating air; a second fan for exhausting air and simultaneously sucking outside air into the drying chamber; and a second fan provided in an exhaust path leading from the drying chamber to the second fan, allowing the exhaust air and intake air by the second fan to exchange heat with each other. A dryer equipped with a heat exchanger.