JP2016047139A - Dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge dehumidification water to the outside without making a leak current from a compressor flow to the outside, irrespective of operation/stop of the compressor of a heat pump unit.SOLUTION: A dryer includes: a heat pump (16) for circulating a heating medium pressurized and heated by a compressor in a condenser, a decompression device, an evaporator and the compressor in this order; an air circulation path for drying for circulating drying air in a drying tub (6) in a first heat exchanger (17) for accommodating the evaporator, a second heat exchanger for accommodating the condenser and the drying tub (6) in this order by a circulation fan (20); a dew condensation water tank (18) for temporarily storing dew condensation water from the drying air generated by condensation by the first heat exchanger (17) and introduced from the drying tub (6); a dew condensation drain pipe (25) for guiding the dew condensation water in the dew condensation water tank (18) to the drying tub (6); and a drain valve (15) interposed in a drain duct (13) for draining the water in the drying tub (6) to the outside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dryer, and more particularly to a dryer that dries wet cloth such as laundry.

  Conventionally, as a washing / drying machine having both a function as a drying machine and a function as a washing machine, there is a washing / drying machine disclosed in Japanese Patent No. 4543787 (Patent Document 1).

  In the conventional washer-dryer disclosed in the above-mentioned Patent Document 1, as a function of the dryer, a compressor, a heater as a condenser, a decompressor, a cooler as an evaporator, and the compressor are combined with a refrigerant pipe. Dehumidifying means connected in an annular shape is provided. Further, the washing tub, the cooler, the heater, and the washing tub are connected in an annular shape by an air passage having a blowing means, a duct, and a flexible hose.

  The said structure WHEREIN: At the time of drying, the said ventilation means and the said compressor are drive | operated. Then, the high-temperature drying air in the heater heated by the operation of the compressor is sent into the washing tub by the operation of the air blowing means, deprives the clothes of moisture, and becomes humid drying air. . Further, the humid drying air in the washing tub is fed into the cooler cooled by the operation of the compressor and is cooled and dehumidified. The dehumidified drying air is sent again into the heater and heated by the blowing means. At that time, the dew condensation water generated in the cooler is temporarily stored in the drainage tank.

  Moreover, the washing drainage channel which flows the wastewater in a washing tub at the time of the said washing | cleaning, and the condensation drainage channel which flows the condensed water stored in the said drainage tank at the time of the said drying are connected to the water pipe in the same location. A drain valve is provided at the junction of the laundry drainage channel, the condensation drainage channel, and the water distribution pipe to switch the communication pipe between the laundry drainage channel and the condensation drainage channel.

  Here, when the compressor is driven by using an inverter under PWM (pulse width modulation) control, the refrigerant electrostatics between the winding and the case inside the compressor in synchronization with the PWM. A high-frequency leakage current flows depending on the capacitance. And since the said dehumidification means and dew condensation water are comprised with the conductor, a leak current flows through the said dehumidification means, and a leak current flows also into the dew condensation water which touches the said dehumidification means. Therefore, if the condensed water is continuously discharged linearly during the operation of the compressor, a leakage current flows to the outside.

  Therefore, during the operation of the compressor, the condensation drainage channel is closed by the drain valve to prevent the leakage current from flowing out through the condensation water to the outside.

Japanese Patent No. 4543787

  However, the conventional washing and drying machine disclosed in Patent Document 1 has the following problems.

  That is, during the operation of the compressor, in order to prevent the condensation water generated in the cooler from being discharged to the outside, the washing drainage channel for flowing wastewater in the washing tub during the washing and the drainage during the drying. The condensation drainage channel for allowing the condensed water stored in the tank to flow is connected to the water distribution pipe at the same location. The drainage valve that switches the communication pipe to the washing drainage path and the condensation drainage path is provided at the junction of the washing drainage path, the condensation drainage path, and the water distribution pipe.

  Therefore, when the drainage tank is filled with condensed water during the drying, the drainage valve is required to discharge the condensed water in the drainage tank by switching the water distribution pipe to the condensed drainage channel side. There is. However, in that case, it is necessary to stop the compressor in order to prevent leakage current from the compressor from flowing to the outside. However, stopping the compressor for a predetermined time at the time of drying causes a decrease in dehumidification performance, and there is a problem that the drying time becomes long.

  Accordingly, an object of the present invention is to provide a dryer capable of discharging dehumidified water to the outside regardless of operation / stop of the compressor of the heat pump unit and without causing leakage current from the compressor to flow outside. is there.

In order to solve the above problems, the dryer of the present invention is:
A heat pump that has a compressor and circulates a condenser, a decompression device, an evaporator, and the compressor in this order in a heat medium pressurized and heated by the compressor;
A drying tank, and drying air in the drying tank by means of a circulation fan, the first heat exchange device containing the evaporator, the second heat exchange device containing the condenser, and the drying tank in this order A drying air circulation path to be circulated;
A condensed water tank that is generated by condensation by the first heat exchange device and temporarily stores condensed water from the drying air introduced from the drying tank;
A dew condensation drain pipe for guiding the dew condensation water in the dew condensation water tank to the drying tank;
A drain valve provided in a drain duct for discharging water in the drying tank to the outside is provided.

In the dryer according to one embodiment,
A check valve is interposed at the end of the dew drainage pipe on the drying tank side.

In the dryer according to one embodiment,
The heat pump is located below the drying tank, and a drainage pump is interposed in the condensation drainage pipe.

In the dryer according to one embodiment,
When driving the drainage pump to guide the condensed water in the condensed water tank to the drying tank, the drain valve is closed.

In the dryer according to one embodiment,
The drying tank has an overflow port,
The connection port to the drying tank in the condensation drainage pipe is above the overflow port.

  As apparent from the above, in the dryer of the present invention, at the time of drying, the compressor of the heat pump is first driven, and then the circulation fan of the drying air circulation path is driven. Then, in the drying air circulation path, the drying air is heated in the second heat exchange device, dehydrates moisture in the drying tank, and is cooled and dehumidified in the first heat exchange device. The Hereinafter, the drying air repeats the above operation to dry the material to be dried in the drying tank.

  At that time, the dew condensation water generated in the first heat exchange device is temporarily stored in the dew condensation water tank. And the dew condensation water in the said dew condensation water tank is guide | induced to the said drying tank by the said dew condensation drainage pipe.

  Here, a high-frequency leakage current flows inside the compressor of the heat pump, and the leakage current also flows in the heat pump made of a conductor, condensed water in the condensed water tank, condensed water drainage pipe, and condensed water in the drying tank. . Therefore, if the drain valve interposed in the drain duct is closed, a current path through which a leakage current from the compressor flows can be blocked by the drain valve.

  Therefore, regardless of whether the compressor in the heat pump is operating or stopped, the condensed water is discharged to the outside through the drying tank without flowing the leakage current generated during the operation of the compressor. It can be done.

It is a longitudinal cross-sectional view of the drum-type washing dryer to which the dryer of this invention is applied. It is a flowchart figure of dew condensation water discharge processing operation.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view of a drum type laundry dryer to which the dryer according to the present embodiment is applied.

  As shown in FIG. 1, the drum type washing and drying machine includes an outer box 1 having an outer box opening 2 on the front surface. The outer box opening 2 is opened and closed by a door 3 that is rotatably attached to the outer box 1 by a hinge. A part of the door 3 is made of a transparent member such as glass so that the inside of the drum 4 can be visually recognized.

  A control device 5 including a microcomputer, a timer, an input / output circuit, and the like is provided at the upper front of the outer box 1. An operation display unit (not shown) and various sensors (not shown) are connected to the control device 5, and signals from the operation display unit and the various sensors can be acquired. Then, calculation and determination are performed based on signals from the operation display unit and the various sensors, and the operation display unit and a load driving circuit (not shown) are controlled to perform a washing operation, a dehydrating operation, a rinsing operation, and a drying operation. Perform the action.

  The operation display unit includes a plurality of operation keys for determining the operation content, a display unit for displaying the operation content determined by the operation key, and the like. As described above, the controller 5 performs a washing operation, a dehydrating operation, a rinsing operation, a drying operation, and the like by the input to the operation display unit.

  Furthermore, this drum-type washing and drying machine has a water tank 6 that is an example of the drying tank disposed in the outer box 1 and a laundry (not shown) such as clothes that is rotatably disposed in the water tank 6. And a drum 4 to be accommodated. Here, for convenience of explanation, in FIG. 1, only the upper half of the water tank 6 has a vertical cross section, and the lower half has side walls.

  A water tank opening 7 that opens to face the outer box opening 2 is provided on the front surface of the water tank 6. The water tank 6 has a bottomed cylindrical shape, and is disposed sideways so that the water tank opening 7 faces the outer box opening 2. In that case, the axis passing through the center of gravity of the water tank 6 is inclined so as to have an angle of 5 ° to 30 ° with respect to the horizontal direction. A main motor 8 is attached to the rear surface (bottom outer surface) of the water tank 6, and the drum 4 is rotated by the main motor 8.

  The drum 4 has a bottomed cylindrical shape, and is inclined so that a bottom portion (that is, a rear portion) is lower than a front portion. That is, the rotation axis of the drum 4 is parallel to the axis passing through the center of gravity of the water tank 6. Therefore, the rotating shaft of the drum 4 is inclined so as to have an angle of 5 ° to 30 ° with respect to the horizontal direction. In addition, a drum opening 9 that opens to face the water tank opening 7 is provided on the front surface of the drum 4. Further, a plurality of through holes 10 (only four are shown as representatives in FIG. 1) are provided in the entire side wall of the drum 4.

  The through hole 10 is a hole for allowing the laundry treatment solution, water, and air to circulate between the space between the water tank 6 and the drum 4 and the space in the drum 4. For example, during drying, heated air supplied into the drum 4 enters the water tank 6 through the through hole 10.

  A packing 11 made of an elastic body such as rubber or soft resin is fixed to the water tank opening 7. Therefore, when the door 3 is closed, the door 3 comes into close contact with the packing 11, so that the liquid in the water tank 6 can be prevented from leaking out of the water tank 6.

  The packing 11 connects the edge of the outer box opening 2 in the outer box 1 and the edge of the water tank opening 7 in the water tank 6 so that the laundry can pass through the space inside the packing 11. Yes. That is, the packing 11 forms an access path for taking in and out the laundry. Further, the packing 11 is provided with a bellows or the like, and can bend according to the swinging of the water tank 6 to follow the movement of the water tank 6.

  A drain port 12 for draining the washing liquid and the like in the water tank 6 to the outside is provided at the lower part of the water tank 6, and an upper end portion of a drain duct 13 is connected to the drain port 12. Washing water in the drain duct 13 is discharged out of the outer box 1 through the drain hose 14.

  A drain valve 15 that is opened and closed by a drain motor (not shown) controlled by the control device 5 is interposed at the end of the drain duct 13 on the drain hose 14 side. That is, the control device 5 controls the opening and closing of the drain valve 15. When the drain valve 15 is opened, the washing water in the water tub 6 is discharged out of the outer box 1 through the drain duct 13 and the drain hose 14.

  A heat pump unit 16 is installed on the bottom plate of the space behind the main motor 8 in the outer box 1. The heat pump unit 16 is constituted by a refrigerant circuit formed by connecting a compressor, a condenser, a pressure reducing device, an evaporator, and the compressor in a ring shape with a refrigerant pipe.

  Next, the circulation path of the drying air will be described.

  A drying air discharge port 22 provided at an upper portion in the vicinity of the rear surface (bottom surface) on the side surface of the water tank 6 and the first heat exchange device 17 accommodating the evaporator are connected by a drying air pipe 23. Further, a drying air introduction port 19 provided at the lower rear surface (bottom surface) of the water tank 6 and a second heat exchange device that accommodates the condenser are connected by an air duct 21 in which a fan unit 20 is interposed. . Although not shown in FIG. 1, the second heat exchange device is located on the rear side of the first heat exchange device 17 in FIG. 1. The first heat exchange device 17 and the second heat exchange device are connected by a duct. Thus, a circulation path for drying air is formed.

  Further, a dew condensation water tank 18 for temporarily storing the dew condensation water condensed by the first heat exchange device 17 is disposed below the first heat exchange device 17.

  One end of a condensate drain pipe 25 provided with a drain pump 24 is connected to the bottom of the dew condensation water tank 18. Further, the other end of the condensation drain pipe 25 is connected to a condensation introduction hole 26 provided on the side wall of the water tank 6. A check valve 27 is provided in the vicinity of the condensation introduction hole 26 in the condensation drain pipe 25 to prevent the backflow of the condensed water to the condensed water tank 18 side.

  An overflow port 28 is provided at a position slightly below the edge of the water tank opening 7 on the side wall of the water tank 6. An overflow pipe 29 that guides the overflow from the overflow port 28 to the drain hose 14 is provided. Here, the height in the vertical direction of the condensation introduction hole 26 is set higher than that of the overflow port 28. This prevents the washing water in the water tank 6 from overflowing into the packing 11 from the water tank opening 7. Further, the washing water in the water tub 6 is prevented from flowing back from the condensation introduction hole 26 into the condensation drain pipe 25.

  Reference numeral 30 denotes a balancer that prevents vibration during rotation of the drum 4.

  Hereinafter, the drying process in the drum type laundry dryer having the above-described configuration will be described.

  The drying process is started under the control of the control device 5. First, the compressor of the heat pump unit 16 is driven, and then the fan unit 20 is driven. Further, the drum 4 is rotated. Then, the drying air in the second heat exchange device having the condenser is heated in the circulation path of the drying air. Then, the drying air in the second heat exchange device that has reached a high temperature is guided to the drying air inlet 19 via the air duct 21 and introduced into the water tank 6 by the operation of the fan unit 20.

  Then, the high-temperature drying air introduced into the water tank 6 is guided into the drum 4 as indicated by an arrow (A), and the moisture in the laundry is deprived in the drum 4 to become humid drying air. . Further, by the operation of the fan unit 20, the humid drying air in the drum 4 passes through the water tank 6, the drying air discharge port 22 and the drying air pipe 23 as indicated by a plurality of arrows, and evaporates. It is introduced into a first heat exchange device 17 having a vessel and cooled and dehumidified. The dehumidified drying air is again introduced into the second heat exchange device through the duct and heated. Thereafter, the drying air repeats the above operation to dry the laundry in the drum 4.

  At that time, the dew condensation water generated in the first heat exchange device 17 is temporarily stored in the dew condensation water tank 18. Here, the dew condensation water tank 18 is provided with a dew condensation water detection sensor (dehumidification water) for detecting the presence or absence of dew condensation water (dehumidified water) below the intermediate portion in the depth direction and above the connection position of the dew condensation drain pipe 25. (Not shown) is installed. Further, a water level sensor (not shown) for detecting that the water level of the dew condensation water has reached a predetermined water level is provided above the intermediate portion in the depth direction. Then, detection signals from the dew condensation water detection sensor and the water level sensor are sent to the control device 5.

  Then, when the control device 5 receives the detection signal from the dew condensation water detection sensor, the control device 5 closes the drain valve 15 interposed in the drain duct 13 and turns on the drain pump 24 interposed in the condensation drain pipe 25. Driving is performed for a first time set in advance at a preset time interval. As an example, it is driven for 15 seconds at 10 minute intervals. In this way, the dew condensation water (dehumidified water) stored in the dew condensation water tank 18 passes through the dew condensation drain pipe 25 and is introduced into the water tank 6 through the check valve 27 and the dew condensation introduction hole 26.

  In addition, the said dew condensation water detection sensor is installed in the lower part rather than the intermediate part of the depth direction in the dew condensation water tank 18, as mentioned above. Therefore, the water level of the dew condensation water tank 18 when the drainage pump 24 is driven is low, and the drainage pump 24 is easily air-engaged. When the drainage pump 24 is engaged with air or the like, the amount of condensed water discharged into the water tank 6 decreases, so the water level in the condensed water tank 18 rises. Eventually, a detection signal from the water level sensor is sent to the control device 5.

  Then, when receiving the detection signal from the water level sensor, the control device 5 drives the drain pump 24 for a second time set in advance longer than the first time. As an example, it is driven for 30 seconds. Thus, by driving for a longer time than the first time described above, coupled with the fact that the water level of the dew condensation water tank 18 is high and the water pressure is high, the air biting of the drainage pump 24 is easily eliminated, and the dew condensation water is discharged into the water tank 6. Can be done quickly.

  Here, when the compressor of the heat pump unit 16 is driven by inverter control, for example, a high-frequency leakage current is generated between the winding and the case inside the compressor in synchronization with the PWM due to the capacitance of the refrigerant. Flowing. The leakage current also flows through the heat pump unit 16 made of a conductor, the condensed water in the condensed water tank 18, the condensed drain pipe 25, the drain pump 24 and the condensed water in the water tank 6. Therefore, the control device 5 closes the drain valve 15 interposed in the drain duct 13 when the compressor of the heat pump unit 16 is driven and when the drain pump 24 is driven. Thus, leakage current generated during the operation of the compressor is prevented from flowing to the outside through the drainage duct 13 and the drainage hose 14.

  In that case, a check valve 27 is interposed in the condensation drain pipe 25, and the vertical height of the condensation introduction hole 26, which is an attachment port of the condensation drain pipe 25 to the water tank 6, is higher than that of the overflow port 28. Is also set high. Accordingly, the washing water in the water tub 6 is prevented from flowing back into the condensation drain pipe 25 from the condensation introduction hole 26 at the time of washing water drainage or washing. Therefore, water pressure due to the washing water is not applied to the check valve 27, and the life of the check valve 27 can be extended.

  Here, the check valve 27 in the present embodiment is preferably a duckbill-shaped valve, for example. Furthermore, a duckbill-shaped valve formed entirely of rubber around the slit is desirable because no abnormal noise is generated when the slit opens and closes due to a pressure change in the water tank 6.

  A water level sensor (not shown) is provided at the lower part of the water tank 6. And when the said water level sensor sends out the detection signal which detected that the water level in the water tank 6 reached the preset set water level to the control apparatus 5, the control apparatus 5 will stop the drain pump 24, and will 15 is opened and the condensed water in the water tank 6 is discharged. In this case, since the drain pump 24 is stopped, the condensed water (dehumidified water) in the condensed water tank 18 and the condensed water (dehumidified water) in the water tank 6 are blocked. Therefore, the leakage current that has flowed to the condensed water in the condensed water tank 18 is prevented from flowing to the outside via the drainage duct 13 and the drainage hose 14. In this case, it is desirable to open the drain valve 15 after a predetermined time has elapsed since the drain pump 24 was stopped. In this case, the dew condensation water (dehumidified water) in the dew condensation drain pipe 25 surely returns to the dew condensation water tank 18, so the dew condensation water (dehumidification water) in the dew condensation water pipe 25 and the dew condensation water (dehumidification water) in the water tank 6 are used. The water is reliably cut off and the safety is further increased.

  Further, the control device 5 has a counter and counts the number of on / off operations of the drainage pump 24 as described above. When the number of operations reaches a preset number, the drain valve 15 is opened and the condensed water in the water tank 6 is discharged. In this case, since the drainage pump 24 is already stopped, the leakage current that has flowed to the condensed water in the condensed water tank 18 is prevented from flowing to the outside.

  Hereinafter, the dew condensation water discharge processing operation executed based on the detection signals from the two sensors, the count signal from the counter, and the time signal from the timer under the control of the control device 5 will be described. FIG. 2 is a flowchart of the condensed water discharge processing operation. When the controller 5 and the fan unit 20 of the heat pump unit 16 are driven by the control device 5, the condensed water discharge processing operation starts.

  In step S1, the drain valve 15 interposed in the drain duct 13 is closed. In step S2, it is determined whether or not condensed water (dehumidified water) is detected based on a detection signal from the condensed water detection sensor of the condensed water tank 18. As a result, if detected, the process proceeds to step S3. In step S3, the drainage pump 24 interposed in the condensation drainage pipe 25 is driven. In step S4, it is determined whether or not a first predetermined time (corresponding to the first time) (for example, 15 seconds) has elapsed since the drainage pump 24 was driven. As a result, if it has elapsed, the process proceeds to step S5. If it has not elapsed, the process returns to step S3 and the drain pump 24 is continuously driven. In step S5, the drain pump 24 is stopped.

  In step S6, it is determined whether or not the drain pump 24 has been driven a predetermined number of times (for example, 3 to 4 times). As a result, if it is the predetermined number of times, the process proceeds to step S7. Otherwise, the process proceeds to step S8. In step S7, the drain valve 15 is opened and the condensed water (dehumidified water) in the water tank 6 is discharged to the outside. After that, the condensed water discharge processing operation is terminated.

  In step S8, it is determined whether or not there is a detection signal from the water level sensor of the water tank 6. As a result, if there is, the process proceeds to step S7. On the other hand, if not, the process proceeds to step S9. In step S9, it is determined whether or not there is a detection signal from the water level sensor of the condensed water tank 18. As a result, if there is, the process proceeds to step S11, and if not, the process proceeds to step S10. In step S10, it is determined whether or not a second predetermined time (10 minutes as an example) has elapsed since the drainage pump 24 was stopped. As a result, if it has elapsed, the process returns to step S3 and the drain pump 24 is driven. On the other hand, if it has not elapsed, the process returns to step S9 to determine the presence or absence of a detection signal from the water level sensor of the dew condensation water tank 18.

  In step S11, the drainage pump 24 is driven. In step S12, it is determined whether or not a third predetermined time (corresponding to the second time) (for example, 30 seconds) has elapsed since the drainage pump 24 was driven. As a result, if it has elapsed, the process proceeds to step S13. If it has not elapsed, the process returns to step S11 and the drain pump 24 is continuously driven. In step S13, the drain pump 24 is stopped. After that, the process returns to step S3, and when the drain valve 15 is opened in step S7, the dew condensation water discharge processing operation is terminated.

  As described above, in the present embodiment, the condensed water tank 18 that temporarily stores the condensed water condensed by the first heat exchange device 17 that houses the evaporator in the heat pump unit 16 is provided. And this dew condensation water tank 18 and the water tank 6 are connected by the dew condensation drain pipe 25 in which the drainage pump 24 was interposed. Therefore, if the drainage valve 15 provided in the drainage duct 13 is closed, the drainage pump 24 is driven and the condensed water temporarily stored in the condensed water tank 18 can be discharged to the water tank 6. .

  In this case, the condensed water (dehumidified water) in the condensed water tank 18 can be discharged to the water tank 6 regardless of whether the compressor in the heat pump unit 16 is operating or stopped. Further, the dehumidified water in the water tank 6 can be discharged to the outside regardless of whether the compressor is operating or stopped by opening the drain valve 15 if the drain pump 24 is stopped. it can.

  Therefore, according to the present embodiment, the dehumidified water can be discharged to the outside regardless of the operation / stop of the compressor of the heat pump unit 16 and without causing leakage current from the compressor to flow outside. .

  In the present embodiment, the dew condensation water detection sensor is installed below the intermediate portion in the depth direction of the dew condensation water tank 18. When the control device 5 receives the detection signal from the dew condensation water detection sensor, the drain valve 15 interposed in the drain duct 13 is closed and the drain pump 24 is preset at a preset time interval. The driving is performed only for the first time.

  Therefore, when there is condensed water (dehumidified water) in the condensed water tank 18, it is automatically stored temporarily in the condensed water tank 18 without causing leakage current from the compressor to flow outside. The condensed water can be discharged into the water tank 6.

  Furthermore, in the present embodiment, the water level sensor is installed above the intermediate portion in the depth direction of the condensed water tank 18. When the control device 5 receives the detection signal from the water level sensor, the drain pump 24 is driven for a second time set in advance longer than the first time.

  Therefore, when the drain pump 24 is air-engaged, the water level of the dew condensation water tank 18 is high and the water pressure is high by driving the drain pump 24 for a longer time than the first time described above. Together with this, it becomes possible to eliminate the air biting, and it becomes possible to quickly discharge condensed water into the water tank 6.

  In the present embodiment, when the drain pump 24 is driven a predetermined number of times by the control device 5, the drain valve 15 is opened and the condensed water (dehumidified water) in the water tank 6 is discharged to the outside. I am doing so.

  Therefore, the condensed water (dehumidified water) accumulated in the water tank 6 can be quickly discharged to the outside.

  In the above embodiment, the present invention is described by taking a drum-type washing / drying machine having a function of a dryer as an example. However, the present invention is not limited to the drum-type washing / drying machine, and a single drying machine may be used.

As mentioned above, the present invention is summarized as follows.
A heat pump 16 that has a compressor and circulates a condenser, a decompression device, an evaporator, and the compressor in this order in a heat medium pressurized and heated by the compressor;
While having the drying tank 6, the drying air in the drying tank 6 is circulated by the circulation fan 20 into the first heat exchange device 17 that houses the evaporator, the second heat exchange device that houses the condenser, and the drying. A drying air circulation path for circulating the tank 6 in this order;
A condensed water tank 18 that is generated by condensation by the first heat exchange device 17 and temporarily stores condensed water from the drying air introduced from the drying tank 6;
A dew condensation drain pipe 25 for guiding the dew condensation water in the dew condensation water tank 18 to the drying tank 6;
A drain valve 15 provided in the drain duct 13 for discharging the water in the drying tank 6 to the outside is provided.

  According to the above configuration, at the time of drying, the compressor of the heat pump 16 is first driven, and then the circulation fan 20 in the drying air circulation path is driven. Then, the drying air in the second heat exchange device is heated in the drying air circulation path. Then, the drying air in the second heat exchange device that has reached a high temperature is introduced into the drying tank 6 by the operation of the circulation fan 20.

  Thus, the high-temperature drying air introduced into the drying tank 6 removes moisture from the object to be dried in the drying tank 6 and becomes humid drying air. Further, by the operation of the circulation fan 20, the humid drying air in the drying tank 6 is introduced into the first heat exchange device 17 and is cooled and dehumidified. Then, the dehumidified drying air is again introduced into the second heat exchange device and heated. Hereinafter, the drying air repeats the above-described operation to dry the object to be dried in the drying tank 6.

  At that time, the dew condensation water generated in the first heat exchange device 17 is temporarily stored in the dew condensation water tank 18. The condensed water in the condensed water tank 18 is guided to the drying tank 6 by the condensed drainage pipe 25.

  Here, a high-frequency leakage current flows inside the compressor of the heat pump 16, and the heat pump 16 made of a conductive material, the condensed water in the condensed water tank 18, the condensed drain pipe 25, and the condensed water in the drying tank 6 are also treated. The leakage current flows. Therefore, if the drain valve 15 interposed in the drain duct 13 is closed, a current path through which a leakage current from the compressor flows can be blocked by the drain valve 15.

  Therefore, regardless of whether the compressor of the heat pump 16 is operating or stopped, condensed water is discharged to the outside through the drying tank without causing leakage current generated during operation of the compressor to flow to the outside. It can be done.

In the dryer according to the first embodiment,
A check valve 27 is interposed at the end of the condensation drain pipe 25 on the drying tank 6 side.

  According to this embodiment, a check valve 27 is interposed in the condensation drain pipe 25 that guides the condensation water in the condensation water tank 18 to the drying tank 6. Therefore, the dew condensation water in the drying tank 6 is prevented from flowing back into the dew condensation drain pipe 25.

In the dryer according to the second embodiment,
The heat pump 16 is located below the drying tank 6, and a drainage pump 24 is interposed in the condensation drainage pipe 25.

  According to this embodiment, the heat pump 16 is located below the drying tank 6. And since the evaporator of the heat pump 16 is located below the drying tank 6, the condensed water in the condensed water tank 18 located below the drying tank 6 is removed from the drying tank. 6, it is necessary to drive the drainage pump 24 interposed in the condensation drainage pipe 25.

  Therefore, in this embodiment, if the drainage pump 24 is stopped, the condensed water in the condensed drainage pipe 25 automatically returns to the condensed water tank 18, and the leakage current from the compressor is reduced. The flowing current path can be blocked by the condensation drain pipe 25.

In the dryer according to the third embodiment,
When the drainage pump 24 is driven and the condensed water in the condensed water tank 18 is guided to the drying tank 6, the drain valve 15 is closed.

  According to this embodiment, when the drainage pump 24 is driven to guide the condensed water in the condensed water tank 18 to the drying tank 6, the compressor is connected between the compressor and the drainage valve 15. A current path through which a leakage current flows is formed. Therefore, when the drain valve 15 is opened, the leakage current flows to the outside. Therefore, when the drainage pump 24 is driven, the leakage current can be prevented from flowing to the outside by closing the drainage valve 15.

In the dryer according to the fourth embodiment,
The drying tank 6 is provided with an overflow port 28,
The connection port to the drying tank 6 in the condensation drain pipe 25 is above the overflow port 28.

  According to this embodiment, the connection port to the drying tank 6 in the condensation drain pipe 25 is above the overflow port 28. Therefore, the dew condensation water in the drying tank 6 does not flow back to the dew condensation drain pipe 25, and the water pressure of the dew condensation water in the drying tank 6 is not applied to the check valve 27. Therefore, the life of the check valve 27 can be extended.

In the dryer according to the fifth embodiment,
A connection port to the drying tank 6 in the condensation drain pipe 25 is a plane perpendicular to a vertical plane and is located below a plane including the central axis in the drying tank 6.

  According to this embodiment, the connection port to the drying tank 6 in the condensation drain pipe 25 is located below the horizontal plane including the central axis in the drying tank 6. Therefore, even when the dew condensation water in the dew condensation water tank 18 is led to the drying tank 6 due to, for example, malfunction of the drainage pump 24 at the time of drying, it is higher above the plane including the central axis in the drying tank 6. It is prevented that dew condensation water pours from the position and the object to be dried gets wet.

DESCRIPTION OF SYMBOLS 1 ... Outer box 2 ... Outer box opening part 3 ... Door 4 ... Drum 5 ... Control apparatus 6 ... Water tank (drying tank)
DESCRIPTION OF SYMBOLS 7 ... Water tank opening part 8 ... Main motor 9 ... Drum opening part 10 ... Through-hole 11 ... Packing 12 ... Drain port 13 ... Drain duct 14 ... Drain hose 15 ... Drain valve 16 ... Heat pump unit 17 ... 1st heat exchanger 18 ... Condensed water tank 19 ... Dry air inlet 20 ... Fan unit 21 ... Air duct 22 ... Dry air outlet 23 ... Dry air pipe 24 ... Drain pump 25 ... Condensate drain pipe 26 ... Condensation inlet hole 27 ... Check valve 28 ... overflow port 29 ... overflow pipe 30 ... balancer

Claims (5)

A heat pump that has a compressor and circulates a condenser, a decompression device, an evaporator, and the compressor in this order in a heat medium pressurized and heated by the compressor;
A drying tank, and drying air in the drying tank by means of a circulation fan, the first heat exchange device containing the evaporator, the second heat exchange device containing the condenser, and the drying tank in this order A drying air circulation path to be circulated;
A condensed water tank that is generated by condensation by the first heat exchange device and temporarily stores condensed water from the drying air introduced from the drying tank;
A dew condensation drain pipe for guiding the dew condensation water in the dew condensation water tank to the drying tank;
A dryer comprising: a drainage valve interposed in a drainage duct for discharging water in the drying tank to the outside. The dryer according to claim 1,
A dryer characterized in that a check valve is interposed at an end of the dew drainage pipe on the drying tank side. In the dryer according to claim 1 or 2,
The said heat pump is located below the said drying tank, The drainage pump is interposed in the said dew condensation drainage pipe, The dryer characterized by the above-mentioned. In the dryer according to claim 3,
When the drain pump is driven and the condensed water in the condensed water tank is guided to the drying tank, the drain valve is closed. In the dryer according to any one of claims 1 to 4,
The drying tank has an overflow port,
The dryer characterized in that the connection port to the drying tank in the dew condensation drain pipe is above the overflow port.

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