JP3071065B2 - Clothes dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer for drying clothes and the like after washing.

[0002]

2. Description of the Related Art In general, a clothes dryer of this type puts clothes into a drum supported in a frame, takes in external air with a fan installed in the frame while rotating the drum, and drives a heating source such as a burner. After heating this, it is drawn into the drum, heat exchanges with clothes in the drum, and then discharged out of the frame through an exhaust duct.

[0003] The temperature of the heated air to be supplied into the drum has a great effect on the clothes inside the drum. Conventionally, a temperature sensor is arranged in an exhaust duct or the like which is the temperature closest to the temperature inside the drum. There has been proposed a dryer in which a heating source is turned on and off so that the detected value of the temperature sensor coincides with a set value (Japanese Utility Model Laid-Open No. 57-10397).

[0004]

However, in such a configuration, if the filter is clogged, the length of the exhaust duct changes according to the degree of the clogging and the length of the exhaust duct changes according to the installation location. However, the exhaust resistance of the air increases according to the length, the amount of ventilation decreases, and the temperature inside the drum rises.However, such temperature inside the drum cannot be detected directly, and the response is slow. There is a possibility that the clothes will be temporarily exposed to a high temperature, causing unexpected damage to clothing.

The present invention has been made in view of the above circumstances, and has as its object to change the exhaust resistance, such as filter clogging, by keeping the temperature near the air supply port of the heated air into the drum constant. It is an object of the present invention to provide a clothes dryer in which clothes are not exposed to high temperatures regardless of external factors to be caused.

[0006]

According to the present invention, there is provided a clothes dryer in which air heated by a gas burner is passed from the outside of the main body to the inside of the drum while rotating a drum into which clothes are put. The air outside the main unit.
The duct that flows into the ram and the
Gas burner to heat the air outside the main body
Heated by the gas burner and supplied into the drum.
A temperature sensor for detecting the temperature of the heated air to be heated, and heating by the gas burner in accordance with the detection signal of the temperature sensor.
Means for adjusting the amount of heat supplied to the drum.
And, the temperature sensor is heated air into the drum.
In the duct near the inflow hole and below the gas burner
It is characterized by being provided in.

[0007]

According to the present invention, it is possible to eliminate the influence of heat on the clothes without exposing the clothes in the drum to a temperature higher than the set temperature by quickly controlling the heating source using the detection signal of the temperature sensor. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. (Embodiment 1) FIG. 1 is a perspective view of a clothes dryer according to the present invention,
FIG. 2 is a side sectional view of the same, in which 1 denotes a frame forming a housing, and 4 denotes a drum. At the front of the frame 1 is provided an opening 1a for clothing, in which a door 2 is provided. As shown in FIG. 2, a vertical partition wall 3 is provided in the frame 1 at a position near the rear end, a drum 4 is provided near an upper front side of the partition wall 3, and a dust removal is provided at a lower portion also serving as an exhaust duct. An air supply duct 6 and a gas burner 7 are provided above the partition wall 3 behind the partition wall 3, and a fan 8, a fan motor 9 and an exhaust pipe 10 are provided below the partition wall 3.

The drum 4 has a large number of ventilation holes 4a in the peripheral wall on the front end side.
Is formed in a cylindrical shape with a
However, a large number of inflow holes 4c are opened in the rear wall, and the periphery of the opening of the clothing input port 4b is formed on a bearing 1b provided on the periphery of the clothing input port 1a of the frame 1, and on the rear wall. The peripheral portions are respectively fitted to bearing portions 3a provided on the partition wall 3 and are rotatably supported. The center of the rear wall of the drum 4 has an axis
One end of 4d is connected, and the other end penetrates the partition wall 3 and protrudes rearward. The pulley 4e provided here is connected to a motor (not shown) via a belt.

The dust remover 5 has a filter 5b provided inside a cylindrical filter case 5a having a large number of holes formed in a peripheral wall, and has a front end portion provided with a filter exchange port formed in a front wall of the frame 1. The rear end portion is fixed to the peripheral wall 1d and faces a hole 3b formed in the partition wall 3. The air supply duct 6 is installed so as to penetrate the partition wall 3. One end of the air supply duct 6 is opened to face substantially the entire rear wall of the drum 4, and the other end is opened behind the frame 1. The other end is provided with a gas burner 7.

The fan 8 has a rotating blade 8b provided in a fan case 8a, and a fan motor (inverter motor) M connected to the rotating blade 8b fixed to the outside of the fan case 8a. The mouth is fixed to a hole 3b formed in the partition wall 3 facing the dust remover 5, and the discharge port is provided with an exhaust pipe.
10 are linked. A temperature sensor SE is installed facing the air supply port in the air supply duct 6, in other words, the air inlet 4c provided in the rear wall of the drum 4. The temperature sensor SE is composed of, for example, a thermistor, etc.
As shown in FIG. 3, it is electrically connected to a gas flow control valve 20 attached to the gas burner 7.

FIG. 3 is an explanatory diagram showing the connection relationship between the temperature sensor SE and the gas flow control valve 20 of the gas burner 7. In FIG.
Reference numeral 15 denotes a DC power supply. The gas flow control valve 20 is a valve housing 21
A valve seat 21a is provided on a central peripheral wall in the upward and downward directions, and a valve body 22 moves upward and downward to contact and separate therefrom, and a gas inlet 21b provided on a peripheral wall of the valve housing 21 above the valve seat 21a. And a gas outlet 21c provided below is shut off and communicated. The valve body 22 is provided with a valve rod 22a, and a plunger 23 is connected to an upper end thereof. A coil 24 is provided on the peripheral wall of the plunger 23, and this coil 24
24 and the temperature sensor SE are connected in series to the DC power supply 15.

Next, the operation of the first embodiment will be described. After the door 2 is opened to put clothes into the drum 4 and the door 2 is closed, a motor (not shown) is driven to drive the drum 4,
The fan motor M is driven to rotate the fans 8 respectively. Further, by igniting the gas burner 7, external air is sucked into the air supply duct 6, heated by the gas burner 7, flows into the drum 4, and is dried by heat exchange with clothing. The air in the drum 4 flows out of the peripheral wall of the drum 4 into the frame 1, passes through the dust remover 5, and is discharged outside through the fan 8 and the exhaust pipe 10. Heated air supplied into the drum 4 through the air supply duct 6 is supplied to the temperature sensor S near the inflow hole 4c into the drum 4.
The temperature is detected by E.

That is, when the temperature of the thermistor constituting the temperature sensor SE is heated and the temperature rises, the resistance value increases, and the current value flowing through the coil 24 of the gas flow control valve 20 shown in FIG. 23 is moved in the direction of arrow A, and the valve body 22 approaches the valve seat 21a and the gas inlet 21b
The flow rate of gas from the gas outlet 21c to the gas outlet 21c is reduced, the amount of heat supplied by the gas burner 7 is reduced, and the temperature of the supplied air is reduced. Conversely, when the temperature of the thermistor decreases, its resistance value decreases, the value of current flowing through the coil 24 of the gas flow control valve 20 increases, and the plunger 23 is moved in the direction of arrow B, and the valve body 22 From the seat 21a and the gas inlet
The flow rate of gas from the gas outlet 21c to the gas outlet 21c increases, the amount of heat supplied from the gas burner 7 increases, and the temperature of the supply air increases.

Therefore, by using an appropriate resistance component as a thermistor, when the supply air temperature becomes higher than the set range, the amount of heat supplied from the gas burner 7 is reduced, and the air temperature is lowered. When the temperature decreases, the amount of heat supplied from the gas burner 7 is increased, and the temperature of the supplied air is increased. As a result, even if the temperature of the heated air flowing into the drum 4 changes due to clogging of the filter 5b or the like, the temperature of the heated air can be maintained at a predetermined value in response to the change. Thermal damage can be prevented.

(Embodiment 2) In this embodiment 2, the resistance value of the thermistor as the temperature sensor SE and the rotation speed of the fan motor (inverter motor) M of the fan 8 are controlled in a predetermined relationship.

FIG. 4 is a block diagram showing a control system according to another embodiment of the present invention. In FIG. 4, 31 indicates a microcomputer, and 32 and 33 indicate input / output circuits. The input / output circuit 32 is connected to a temperature sensor (thermistor) SE, a keyboard 34 for temperature setting, a display device 35 for temperature display, and the like. A signal (for example, current value) from the temperature sensor SE passes through an input / output circuit 32 to a microcomputer 31
Is input to The microcomputer 31 obtains an inverter operation signal S ₁ , an inverter frequency command output S _{2, and the} like based on the current value that is the detection signal, and outputs it to the fan motor M.

For example, when the temperature of the heated air flowing into the drum 4 increases, the resistance value of the thermistor serving as the temperature sensor SE increases, and the current value decreases. In response to the decrease in the current value, the microcomputer 31 outputs an inverter frequency command to the fan motor M and increases the amount of air blown by the fan 8 to lower the temperature of the heated air flowing into the drum 4.

Conversely, when the temperature of the heated air flowing into the drum 4 decreases, the resistance value of the thermistor decreases, and the current value increases. Therefore, the microcomputer 31 calculates the rotation speed of the fan motor M corresponding to this. An inverter frequency command is output to the fan motor M to reduce the number of revolutions, and the temperature of air flowing into the drum 4 is increased by reducing the amount of air blown.

Other structures and operations are substantially the same as those of the first embodiment. In the second embodiment, the temperature of the heated air directly or indirectly into the drum 4 depends on the change in the gas supply to the gas burner, the length of the exhaust pipe 10, the degree of clogging of the filter 5b of the dust remover 5, and the like. Even if the air temperature changes, the amount of the heated air can be suppressed by adjusting the amount of air to be blown in accordance with the air flow, and the air at a predetermined temperature can be stably supplied into the drum 4, thereby reliably preventing damage to the clothes. You can do it.

[0021]

As described above, according to the present invention, the temperature of the heated air supplied to the inside of the drum can always be maintained within a predetermined range irrespective of external factors, and the damage of the clothing due to heat can be ensured. The present invention has excellent effects, for example, it can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a clothes dryer according to the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a schematic diagram showing a connection relationship between a temperature sensor and a gas flow control valve of the clothes dryer according to the present invention.

FIG. 4 is a block diagram showing a control system for a fan motor according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 frame 2 door 3 partition wall 4 drum 5 dust remover 6 air supply duct 7 gas burner 8 fan 10 exhaust pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-57298 (JP, A) JP-A-4-152998 (JP, A) JP-A-62-249700 (JP, A) 6208 (JP, Y1) Jikken 47-39027 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) D06F 58/28

Claims (1)

(57) [Claims] 1. While rotating a drum into which clothes are put,
In a clothes dryer in which air heated by a gas burner is allowed to flow from the outside of the main body to the inside of the drum, a duct for allowing air outside the main body to flow into the drum is provided.
Heated air outside the main unit that is installed inside the duct
And a gas burner heated by the gas burner.
A temperature sensor that detects the temperature of the heated air supplied to the ram
And the gas bath corresponding to the detection signal of the temperature sensor.
Means for adjusting the amount of heat supplied to the drum by being heated by the heater, and feeding the temperature sensor into the drum.
Near the inlet of the heated air and from the gas burner
A clothes dryer provided in a lower duct .