JPS5941830Y2 - Dryer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dryer that uses liquid fuel as a heat source by vaporizing and burning it.

Conventional clothes dryers all use electricity or city gas as their heat source, which poses problems such as high operating costs.

On the other hand, if oil is used as the heat source, the operating cost can be kept low, and for this reason, a dryer equipped with an oil vaporization type heat generating device has been devised.

That is, a dryer equipped with a heat generating device configured to supply white kerosene from an oil supply device into a vaporizing pot heated by a heater, vaporize it, and supply hot air obtained by combusting the vaporized gas into a drying chamber. has been devised.

In such a dryer, the combustion operation of the heat generating device is stopped in response to the opening of the door provided at the opening for entering and exiting the material to be dried, and the combustion operation is restarted in response to the closing of the layer. The configuration does not include a door switch.

However, the door switch described above is configured to stop the refueling device when the door is opened, and at the same time cut off the power to the heater for heating the vaporizing pot, so that when the door is subsequently closed, the combustion operation of the heat generating device is resumed. The disadvantage is that sometimes the vaporization of the white kerosene does not take place immediately, so that the combustion operation is not resumed immediately even though the refueling system and the ignition system are in operation.

In addition, there is a drawback that white kerosene is supplied one after another into the vaporizing pot until the vaporization action in the vaporizing pot is restarted, and the white kerosene remains without being vaporized. There is a problem in that it takes a considerable amount of time until the normal combustion operation, in which the kerosene is sequentially vaporized and combusted, takes place.

Therefore, the purpose of this invention is to vaporize and burn liquid fuel and use it as a heat source, at the moment when the combustion operation of the heat generating device resumes in response to the opening and closing of the door, and the supply of liquid fuel by the refueling device resumes. To provide a dryer which is capable of starting the vaporization of the liquid heating material immediately, restarting the combustion operation of a heat generating device immediately, and quickly shifting to normal combustion operation. be.

An embodiment of the present invention will be described below based on the drawings.

First, in FIG. 1 showing the overall structure, 1 is an outer box with a front plate 2 and a back plate 3 attached to the front and rear sides, respectively. It forms an entrance 5 for things.

Reference numeral 6 denotes a rotating drum with a drying chamber 7 inside, which is placed inside the outer box 1 with a predetermined space A between it and the back plate 3, and whose front part is fitted into the doorway 5. It is supported on the front plate 2 via a bearing member 8, and the rear part is supported on the back plate 3 via a bearing device 9.

Reference numeral 10 denotes an exhaust duct, the suction side end of which communicates with the drying chamber 7 via the filter tube 11 formed on the front plate 2 and the entrance/exit 5, and the discharge side end protruding outside the outer box 1. ing.

Reference numeral 12 denotes a fan casing portion provided in the middle of the duct 10, and a fan 14 rotatably driven by a motor 13 is disposed inside the fan casing portion.

Reference numeral 15 denotes a pulley attached to the end of the rotating shaft of the motor 13 on the side opposite to the fan 14, and a belt 16 is stretched between the pulley and the outer periphery of the rotating drum 6.

1γ is a group of intake holes formed in the back plate 3, and 18 is a group of ventilation holes formed on the back side of the rotating drum 6 so as to communicate between the drying chamber 7 and the space A.

Reference numeral 19 denotes a heat generating device disposed within the space A, which is of a type that vaporizes and burns white kerosene, for example.

That is, in this heat generating device 19, 20 is a combustion chamber that receives outside air through an intake pipe 21, and a vaporizing pot 22 and a perforated plate-shaped burner 23 are disposed inside the combustion chamber.
A heater 24 is buried in the bottom of the vaporizing pot 22, and an ignition device 25 is further provided directly above the burner 23.

Further, 26 is a container-shaped heat exchanger forming a part of the heat generating device 19, to which high temperature combustion gas generated in the combustion chamber 20 is supplied via a vibrator 27. The supplied combustion gas is discharged to the outside of the outer box 1 via an exhaust pipe 28.

Reference numeral 29 denotes an electromagnetic pump serving as a refueling device, which is configured to supply an appropriate amount of oil in an oil tank (not shown) into the vaporizer bot 22 via a refueling pipe 30. "are doing.

In addition, 31 is a timer device attached to the front plate 2, and this is a timer motor 31a and a normally open contact 31b shown in FIG.
The normally open contact 31b is turned on in response to a time limit setting operation and is turned off when the time limit operation by the timer motor 31a ends.

Next, in FIGS. 2 and 3 showing the electrical configuration, 32
is a power supply, one end of which is connected to the normally open connection of the power switch 33 and the timer device 31, and connected to the bus bar 34 through Q3 lb in series.
The other end is connected to the bus bar 35.

36 is a door switch that is turned off in conjunction with the opening of the field 4 and turned on in conjunction with the closing of the door 4;
4 and the auxiliary bus bar 37.

38 is a normally open first temperature switch disposed in the duct 10, and switch 'L senses when the temperature of the exhaust gas discharged from the drying chamber 7 exceeds dloC. This is the configuration that turns it on for the first time.

Further, 39 and 40 are normally closed second and third temperature switches provided to sense the temperature of the heater 24, respectively, and these are turned off for the first time when the heater 24 exceeds a predetermined temperature. It is the composition.

41 is a first relay, which has normally open relay switches 41a, 41b and an exciting coil 41c.

42 is a second relay, which is a changeover type relay switch 42a.

42b and an excitation coil 42c, the excitation coil 42c
When energized, each relay switch 42a.

When the contact pieces (c-a) of 42b are closed and the excitation coil 42C is disconnected, each monthly switch 42a is activated.

The contact pieces (c-b) of 42b are closed.

However, V relay switch 42a between bus bars 34 and 35
A series circuit of the second temperature switch 39 and the heater 24 is connected between the contact pieces (c-b) of the bus bar 34.
35 between the third temperature switch 40 and the excitation coil 41c
A relay switch 41a is connected in parallel with the second temperature switch 40.

Also, between the auxiliary bus bar 37 and the bus bar 35, the series circuit of the first temperature switch 38 and the exciting coil 42c, and the contact piece (c-a) of the relay switch 42b, and the timer motor 31a.
Similarly, the motor 13 is connected between the auxiliary bus bar 37 and the bus bar 35.

Then, the common connection point of the temperature switch 38 and the excitation coil 42c and the fixed contact piece a of the Lou switch 42a are connected to each other.

43 is a delay circuit which will be described later, and its terminal A is connected to the auxiliary bus 31.
, terminal B is connected to the bus bar 35, and terminal C is connected to the relay switch 42 via the relay switch 41b.
Connect to the fixed contact piece b, and then connect the terminal to the electromagnetic pump 29.
It is connected to the bus bar 35 via C0).

Reference numeral 44 denotes a timer circuit, which is configured to close the normally open contact 44b for a predetermined short time from the start of direct communication when the circuit main body 44a is energized, and the circuit main body 44a is connected in parallel with the electromagnetic pump 29. and the normally open contact 44
b and the series circuit of the ignition device 25 are also connected to the electromagnetic pump 29.
are connected in parallel.

Here, the delay circuit 43 is constructed in a ridge as shown in FIG. 3, and this will be described below.

That is, a parallel circuit of the excitation coil 45a of the relay 45 and the primary winding 46a of the step-down transformer 46 is connected between terminals A and B, and a parallel circuit of the illustrated polarity is connected between both ends of the secondary winding 46b of the step-down transformer 46. A series circuit of a diode 47 and a smoothing capacitor 48 is connected.

Further, a series circuit of the normally open contact 45b1 of the relay 45, a resistor 49, and a delay element θ capacitor 50 is connected in parallel with the smoothing capacitor 48, and a series circuit of the relay 51 is connected in parallel with the series circuit of the resistor 49 and capacitor 50. A series circuit of the excitation coil 51a and the thyristor 52 is connected.

Further, a resistor 53 is connected in parallel with the capacitor 50, and their common connection point is connected to the gate of the thyristor 52.

A normally open contact 51b of the relay 51 is connected between terminals C and D.
is connected.

Therefore, in such a delay circuit 43, when power is applied between terminals A and B, charging of the capacitor 50 is started by closing the normally open contact 45b in response to this, and the charging voltage reaches a predetermined value. When the thyristor 52 is turned on, the normally open contact 51b is closed.

That is, the configuration is such that when a predetermined delay time has elapsed after power is turned on between terminals A and B, terminals C and D are brought into conduction.

Next, the operation of the above embodiment will be explained with reference to FIG. 4 as well.

In addition, this figure 4 shows the change characteristics of exhaust temperature during drying operation, where the horizontal axis is time T and the vertical axis is exhaust temperature D.
Represents °C.

First, the items to be dried such as clothes are placed in the drying chamber I, and the door 4 is opened.
is closed and the door switch 36 is turned on,
Next, the timer device 31 is set and operated to close its normally open contact 31b, and the power switch 33 is also closed.

At the beginning of such operation, the first temperature switch 38 that senses the exhaust gas temperature is turned off, and the heater 2 is turned off.
4 second and third temperature switches 39.4
0 is on, the first relay 41 has its excitation coil 41c energized and each relay switch 41a.

41b is turned on and placed in a self-holding state,
The second relay 42 is a relay switch 42a.

The contact pieces (c-b) of 42b are turned on.

However, at the same time as the power switch 33 is closed, the motor 13
is energized, which rotates the rotary drum 6 and agitates the material to be dried inside, and at the same time rotates the fan 14, which causes the outside air sucked into the space A from the intake hole group 17 to flow through the ventilation hole group. The air is blown into the drying chamber γ through the air filter 18 and then exhausted to the outside through the filter chamber 11 and the duct 10.

Further, at the same time as the power switch 33 is closed, the heater 24 is energized to heat the vaporizing pot 22, and when the return time has elapsed after the power switch 33 is closed, the delay circuit 43
Terminals C and D are brought into conduction, and the electromagnetic pump 29 and the circuit body 44a of the timer circuit 44 are energized.

Therefore, white kerosene is supplied into the preheated vaporization pot 22 by the electromagnetic pump 29 and vaporized, and the normally open contact 4 responds to the energization of the circuit main body 44a.
4b turns on, the ignition device 25 is energized for a predetermined short period of time, thereby igniting the vaporized white kerosene gas.

In the combustion chamber 20, the white kerosene supplied one after another by the electromagnetic pump 29 is vaporized, and since this vaporized gas is not mixed with the air from the intake pipe 21, the burner 2
This combustion gas flows into the heat exchanger 26 and heats it, and then is discharged to the outside via the exhaust pipe 28.

Therefore, as described above, the outside air sucked into the space A by the rotation of the fan 14 is heated by the heat exchanger 26, is turned into hot air, and is then supplied into the drying chamber 7, thereby causing so-called drying. The hot air drying process is now executed.

Note that the third temperature switch 40 is turned off in response to the rise in temperature of the heater 24, but as described above, the first relay 41 is in a self-holding state and its relay switches 41a and 4 are turned off.
lb never turns off.

Further, the temperature increase of the heater 24 is controlled by the second hair wetting switch 39.
is suppressed below a certain value.

Thereafter, as the hot air drying process described above progresses, the drying rate of the material to be dried (100% drying rate here does not mean zero moisture, but refers to an artificially determined target value) is 90%. When the temperature exceeds the temperature limit, the exhaust temperature mD starts to rise rapidly.

Then, at time 1° (see Fig. 4) when the drying rate reaches about 95%, the first temperature switch 38 that senses the exhaust temperature Dd1 at this time is turned on, so that the second relay 42 is energized. The coil 42c is energized and the relay switch 4
The contacts (c-a) of contacts 2a and 42b are turned on, and the second relay 42 is brought into a self-holding state.

Therefore, the electromagnetic pump 29 and the heater 24 are cut off, and the combustion of white kerosene in the heat generating device 19 is stopped.
The timer motor 31a of the timer device 31 is energized to start a set timed operation.

In this way, a so-called cold air drying process is started in which cold air is supplied into the drying chamber 7, and in this cold air drying process, the normally open contact 31 of the timer device 31 is terminated.
This continues until time t2 (see FIG. 4) when b is turned off.

That is, by turning off the normally open contact 31b, the motor 13 is stopped from being de-energized, and the first and second relays 41 and 42 are turned off.
The self-holding state of is released and these are returned to their initial state.

By the way, when the door 4 is opened during the hot air drying process described above, the door switch 36 is turned off and the motor 1 is turned off.
3 and the electromagnetic pump 29, thereby stopping the rotation of the rotary drum 6 and the fan 14, and also stopping the combustion operation of the heat generating device 19, thereby temporarily interrupting the hot air drying process.

At this time, the heater 24 is energized and heats the vaporizing pot 22 regardless of the operation of the door switch 36.

Then, when the door 4 is closed and the door switch 36 is turned on, the motor 13 is re-energized, and after a delay time due to the delay circuit 43, the electromagnetic pump 29 and the ignition device 25 are re-energized. As a result, the combustion operation of the heat generating device 19 is restarted, and the hot air drying process is continued.

According to the present embodiment described above, the heater 24 for heating the vaporizer bot 22 is configured to be energized regardless of the operation of the door switch 36, so that the vaporization occurs even during the interruption of the hot air drying process due to the opening of the door 4. Since the pot 22 is heated, when the combustion operation of the heating device 19 is restarted after the door 4 is closed, white kerosene can be vaporized at the moment when the supply of white kerosene into the vaporizer bot 22 is resumed. As a result, the combustion operation of the heat generating device 19 can be restarted immediately when the refueling device 29 and the ignition device 25 start operating after the door 4 is closed.

Therefore, white kerosene is not successively supplied into the vaporizer bot 22 until the vaporization action within the vaporizer bot 22 is restarted, and the white kerosene does not remain unvaporized, resulting in normal combustion operation. Can be migrated early.

Further, according to the above embodiment, the first temperature switch 38 is provided to sense the exhaust temperature and shift from the hot air drying process to the cold air drying process.
Since the second relay 42 is provided to turn off the power to the heater 24 at the same time as the transition to the cold air drying process, the heater 24 is not unnecessarily energized during the cold air drying process.

Further, according to the above embodiment, a delay circuit 43 is provided to energize the electromagnetic pump 29 and the ignition device 25 after a predetermined delay time has elapsed after the door switch 36 is turned on when the door 4 is closed. ,During the hot air drying process, door 4
When the door 4 is opened or closed, there is no risk that the combustion operation of the heat generating device 19 will restart until a predetermined time has elapsed since the door was closed. Therefore, even if the door 4 is frequently opened and closed during the hot air drying process, This prevents the combustion operation from being restarted each time, and in particular can suppress the reduction in the life of the ignition device 25 and the generation of so-called raw gas that occurs each time vaporized gas is ignited.

According to the present invention, as is clear from the above explanation, in a dryer that vaporizes and burns liquid fuel and uses this as a heat source, when the heating device restarts the combustion operation in response to the opening and closing of the door, the refueling device It may be possible to start vaporizing the liquid fuel the moment the fuel supply is resumed, and the combustion operation of the heat generating device may be restarted immediately;
This can bring about effects such as being able to quickly shift to normal combustion operation.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a vertical sectional side view, Fig. 2 is an overall electrical circuit diagram, Fig. 3 is an electrical circuit diagram of a delay circuit, and Fig. 4 is a diagram for explaining the operation. It is a temperature characteristic curve diagram. In the figure, 4 is a door, 5 is an entrance, 7 is a drying room, 19 is a heat generating device, 24 is a heater, 25 is an ignition device, 29 is an electromagnetic pump (oil supply device), 36 is a door switch, and 43 is a delay circuit. .

Claims (1)

[Scope of utility model registration request] 1. A heat generating device that vaporizes and burns the liquid fuel sent from the fuel supply device using a heater, an ignition device for starting the combustion operation of the heat generating device, a drying chamber that receives hot air from the heat generating device, and a drying chamber. It is provided so as to be interlocked with a door for opening and closing an entrance/exit of an object, and stops combustion of the heat generating device in response to the opening of the door, and drives the ignition device to start the combustion operation of the heat generating device after the layer is closed. 4. A dryer comprising a door switch, the heater being connected to be energized regardless of the operation of the door switch. 2. The ignition device is configured to be activated when a predetermined delay time has elapsed after the operation of the door switch in response to the closing of the door. Dryer listed.