JP7340918B2 - Lint removal equipment and laundry dryer - Google Patents

Description

The present invention relates to a lint removal device installed in an air flow path, and in particular to a device that uses a lint collector to remove lint from the air flowing through the flow path, and in particular, it relates to a device that uses a lint collector to remove lint from the air flowing through the flow path. The present invention relates to the above-described device characterized by a means for removing lint, and a laundry dryer equipped with the device.

In a laundry dryer that ventilates and dries laundry stored in the machine, lint generated from the laundry gets mixed into the drying air. In a typical dryer, a lint collector is provided in the drying air flow path to remove lint from the drying air. The lint remains accumulated on the filtration surface of the lint collector (the surface on which air flows in; herein referred to as the "lint adhering surface" and the surface on the outflow side is simply referred to as the "back surface") and dries. When the machine is operated, ventilation resistance increases and air volume decreases, reducing drying efficiency and making drying take longer. For this reason, it is necessary to remove the lint accumulated on the lint-adhering surface every time drying is performed several times.

A common method for automatically removing dust such as lint accumulated on a lint-attached surface is to flow air in the opposite direction through a lint collector or to rub the lint-attached surface with a brush, but Patent Document 1 describes The system sprays air from above and from the sides at the boundary between the lint adhering surface and the lint adhering surface to separate and fall the lint from the lint adhering surface, and collects the fallen lint into the lint box using a suction fan. A structural laundry dryer has been proposed.

On the other hand, in Patent Document 2, the applicant of the present invention discloses that external air introduction dampers are provided at the upper side, lower part, and rear surface of the lint adhesion surface of the lint collector, which are arranged diagonally so as to block the vertical air flow path. A lint removal device equipped with a switching damper and a back damper is proposed. The switching damper opens the air inflow path on the upstream side of the lint adhering surface when opened, and opens the air inflow path to the lint collector with an inflow slit left between it and the air inflow side of the lint adhering surface when closed. Cut off. On the other hand, the back surface damper allows air to pass over the entire surface of the lint collector when it is open, and when it is closed, it remains attached to the back surface and prevents air from passing through, leaving an outflow area adjacent to the downstream edge of the back surface. The back damper moves in a direction perpendicular to the plane of the back surface to close off the back surface except for the outflow area.

The lint removal device described in Patent Document 2 uses wind pressure accompanying the closing operation of the back damper to push the air on the back side of the lint collector toward the lint adhesion surface, lift up the lint adhering to the lint adhesion surface, and close the device. The back damper guides the air flowing in from the inflow slit along the lint adhering surface, and the air and the outside air flowing in from the upper side of the lint adhering surface separate and remove the lint accumulated on the lint adhering surface. It is.

Japanese Patent Application Publication No. 2002-113291 JP2009-201864A

In a lint removal device that uses only air injection, such as the one described in Patent Document 1, when air is injected onto the lint that has accumulated in a film on the lint-adhering surface, only the portion of the lint that is hit by the jet is blown off in a worm-eaten pattern, causing the lint to become lint-free. There was a problem that it was only partially removed. There have been proposals to spray air in the form of slits, but it is difficult to apply a peeling force uniformly over the entire surface of the lint that has adhered to the film, and the lint tends to peel off in a moth-eaten pattern and scatter.

On the other hand, the method proposed in Patent Document 2 has the advantage that the lint trapped in the lint collector can be removed using only the ventilation blower provided in the machine. However, if the wind pressure of the ventilation blower is not sufficient, the lint cannot be removed from the lint-attached surface, and there is a problem in that the three dampers, especially the rear damper, must be closed against the large wind pressure of the ventilation blower. .

Further, in a laundry dryer, the control procedure for the drying process and the control procedure for the lint removal operation are registered in the controller, and the lint removal operation is controlled to be interrupted in the middle of the repeatedly executed drying process. Therefore, the control is such that the lint removal operation is started after the drying process is completed and the ventilation blower decelerates and stops, which takes the time required to stop the ventilation blower at the end of the drying process and the time required to remove lint afterwards. The time it takes to accelerate the ventilation blower to the wind pressure is wasted time that does not contribute to drying the laundry or removing lint.

In addition, the method of Patent Document 2 has a structure in which the lint attached by the wind pressure of the ventilation blower is scraped off in the opposite direction to the direction in which the wind pressure acts, so the force that tries to suck the film-like lint attached to the lint-attached surface is There was also the problem that it took a long time to remove lint due to the balance with the force of peeling and falling off.

This invention relates to an improvement of the lint removal device proposed in Patent Document 2, which has a simpler structure, reduces the above-mentioned wasted time, and reliably removes the lint captured by the lint collector in a shorter time. The objective is to obtain a lint removal device that can remove lint by

The lint removal device of the present invention has a back surface that injects air from the back side of the lint adhesion surface 22 of the lint collector to a region below the upper side of the lint adhesion surface, instead of the back damper in the lint removal device proposed in Patent Document 2. A front nozzle 27 is provided on the nozzle 28 or the upper side of the lint adhesion surface 22 to inject air flowing along the lint adhesion surface obliquely downward. Although it is preferable to provide both the front nozzle 27 and the back nozzle 28, it is also possible to provide only one of them, and when only one is provided, it is preferable to provide the back nozzle 28.

The lint removal device of the present invention starts the lint removal operation during deceleration after the ventilation blower 45, which circulates air through the air passage 2 in which the lint collector 21 is disposed, receives a stop signal. 45 has stopped.

The lint removal device of the present invention includes an air flow path 2 provided in the vertical direction, a ventilation blower 45 that flows air from below to the top in this air flow path, and a lint removal device that captures lint in the air flowing through the air flow path 2. In order to do this, a narrow inflow slit 26 is left between the lint collector 21 having a lint adhesion surface 22 arranged to obliquely block the air flow path and the lower side 22b of the lint adhesion surface when closed. and a switching damper 23 that closes the ventilation port 14 on the upstream side of the lint collector when the lint collector is in the upstream state.

Furthermore, the lint removal device of the present invention has one or both of the front nozzle 27 provided close to the upper side 22a of the lint adhering surface 22 and the back nozzle 28 provided apart from the back surface of the lint adhering surface 22. We are prepared. The front nozzle 27 is arranged to blow out an air flow obliquely downward toward the lint adhesion surface 22, and the back nozzle 28 is arranged to blow out an air flow diagonally downward toward the lint adhesion surface 22. It is arranged so that it blows out.

The switching damper 23 closes the vent 14 when the ventilation blower 45 decelerates after the stop signal is sent, and the front nozzle 27 and the back nozzle 28 close the vent 14 after a predetermined time after the switching damper 23 closes the vent 14. Inject air. It is preferable that air is injected from these nozzles in such a manner that the air is repeatedly injected and stopped in a predetermined cycle. The air injection of these nozzles 27, 28 typically continues until after the draft blower 45 actually stops.

The lint removing device of the present invention is particularly suitable as a lint removing device for a commercial laundry dryer that continuously repeats a drying process of drying washed laundry with drying air A.

The lint removal device of this invention utilizes the inertial rotation of the ventilation blower that circulates air to the lint collector to push upward and collect the lint adhering to the lint adhesion surface of the lint collector, thereby temporarily removing lumps of lint. By spraying air from the nozzle to target the clumps, the lint adhered to the lint-adhering surface is prevented from peeling off and scattering, and the entire lint on the lint-adhering surface is smoothly removed. Can be removed.

In addition, since the lint removal operation starts when the ventilation blower 45 is decelerating toward a stop, and ends when the ventilation blower 45 is stopped, the rotation of the ventilation blower is repeatedly stopped in a machine such as a laundry dryer. Lint can be removed from the lint collector 21 without wasting time.

Cross-sectional front view of a laundry dryer according to an example Front view showing the rotational drive system of the inner cylinder Time chart showing lint removal operation in a laundry dryer Side view of the lint collector during drying operation, seen from the front of the laundry dryer A diagram similar to Figure 4 during the lint removal operation A diagram similar to Figure 4 immediately before the end of the lint removal operation. Time chart showing an example of performing a series of lint removal operations Time chart showing an example of performing lint removal operation divided into steps 1 to 3 Cross-sectional plan view of the suction duct of the laundry dryer in Figure 1 Cross-sectional plan view of the exhaust duct Cross-sectional side view mainly showing the exhaust flow path

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to drawings showing examples of a commercial laundry dryer equipped with a lint removing device of the present invention. The laundry dryer shown in the figure has a structure in which laundry placed in an inner barrel 11 that rotates around a horizontal axis within the dryer main body 1 is dried by drying air A that passes through the inner barrel in the diametrical direction. be. The inner shell 11 has a circumferential surface such as a wire mesh through which the drying air A can pass, and a baffle 12 is appropriately provided inside the circumferential surface. A laundry inlet and an outlet are provided at both ends of the inner drum 11 in the axial direction (front and rear in the plane of the drawing in FIG. The laundry is repeatedly scraped up by the baffle 12 and dropped, and during this process, the laundry dried by the drying air A flowing through the inner drum is discharged from the discharge port to the next process.

As shown in FIG. 2, the inner shell 11 has four drives that support the inner shell at the bottom of a circular holding frame provided at both ends of the inner shell 11 in the axial direction (direction perpendicular to the plane of the paper in FIG. 2). It is supported by rollers 51. The drive roller 51 is rotationally driven via a belt 53 by an inverter motor 52 whose rotational speed is controlled by a controller (not shown). At the beginning of the drying operation, heavy laundry containing moisture is accumulated at the bottom of the inner drum 11, so a driving force is required to rotate the inner drum 11 against the gravity.

The inner cylinder 11 is rotationally driven by the frictional force on the circumferential surface of the drive roller 51. However, due to an increase in the rotational resistance of the inner cylinder 11, a decrease in the friction coefficient of the drive roller 51, etc., the belt 53 and the drive roller 51 are rotated. may slip, resulting in a situation where the inner shell 11 is not rotating even if the drive motor 52 is rotating. Such abnormal rotation of the inner drum 11 cannot be detected only by detecting the rotation of the drive motor 52, and if the operation continues without being noticed, it may lead to poor drying, damage to mechanical parts, or damage to the laundry during drying. Occur.

In order to avoid this problem, the illustrated laundry dryer is provided with a rotation detection means for directly detecting the rotation of the inner drum 11. As the rotation detection means, the outer peripheral surface of the holding frame of the inner body 11 may be painted in two colors, white and black, and a sensor 54 may be provided to optically detect the color difference, or a metal piece attached to the holding frame may be magnetically detected. For example, means for detecting By directly detecting that the inner drum 11 is rotating by such a means, it is possible to prevent drying defects and damage to the laundry or the machine due to abnormal rotation of the inner drum 11.

Drying air A flows into the dryer main body 1 from the inlet opening 13 provided in the upper right corner of FIG. The air flows into the air flow path 2 from the lower left vent hole 14. The drying air A that has passed through the vent 14 is removed from the lint in the passing air by a lint collector 21 that is installed to block the air flow path 2, and then is sent to the upper left outlet of the dryer main body 1 in FIG. It flows out from the opening 15 into the exhaust duct 4. Inside the dryer main body 1, partition walls 16, 17, 18, and 19 are provided for guiding the drying air A to flow across the inside of the inner shell 11. The ventilation blower 45 is rotationally driven by an inverter motor 46 whose rotational speed is controlled by a controller (not shown).

The ventilation port 14 is provided with a switching damper 23 which is pivotally attached to the lower side 23b and swings to open and close the ventilation port 14. In the air flow path 2, the lint collector 21 obliquely blocks the air flow path 2 so that the upper side 23a of the switching damper 23 in the closed state and the lower side 22b of the lint adhering surface are adjacent to each other. is fixed.

The switching damper 23 is opened and closed by the expansion and contraction of an air cylinder 24 installed between its upper side 23a and a fixed position of the dryer main body. When the switching damper 23 is opened, it swings to close the space 25 on the back side of the damper to open the vent 14, and when it is closed, the switching damper 23 opens the upper part of the space 25 and opens the upper side 23a. The vent hole 14 is closed while leaving a narrow inflow slit 26 between the lint-attached surface and the lower side 22b of the lint-attached surface.

A front nozzle 27 is provided close to the upper side 22a of the lint adhering surface 22 of the lint collector 21 so as to blow out an air flow obliquely downward along the lint adhering surface. On the back side of the lint collector 21, a back nozzle 28 is provided that is 10 to 100 mm away from the lint adhesion surface 22 and blows out an air flow toward a region below the upper side 22a of the back surface of the lint adhesion surface 22. As the back nozzle 28, it is preferable to use a circular blow-out type air nozzle with a large flow rate. These nozzles 27 and 28 are provided one or more depending on the area of the lint collector 21, and are supplied with factory air or air pressurized by a compressor from an air tank 55 via solenoid valves 56 and 57 that are opened and closed by a controller. is supplied.

When the nozzles 27 and 28 are provided in close contact with the lint adhering surface 22, the injected air hits the lint before it spreads sufficiently, and the lint that has accumulated in a film is peeled off in a worm-eaten shape and blown away. When the nozzles 27 and 28 are provided at a certain distance from the lint adhering surface 22, the ejected air spreads out and the ejected pressure is transmitted over a relatively wide range, so that it is possible to prevent the lint from partially peeling off and scattering.

By passing through the laundry, lint is introduced into the drying air exhaust. When the lint contained in the exhaust gas passes through the lint collector 21, it adheres to the lint adhesion surface 22. After drying the laundry several times, lint accumulates in the form of a film on the lint adhering surface 22, and the passage of the drying air A is obstructed. Every time the drying operation is performed a number of times set depending on the type of laundry to be dried, the pressure of the pressure gauge installed on the back side of the lint collector 21 decreases, or the pressure difference between the pressure gauges installed on the front and back sides increases. When detected, an operation is performed to remove the lint adhering to the lint adhering surface 22.

As shown in the time chart of FIG. 3, the lint removal operation in the lint removal device of the present invention is performed when the previous drying process is completed and a stop signal is sent to the ventilation blower 45, or when the blower is decelerated thereafter. will be started. When the controller outputs a stop signal for the ventilation blower 45 after completing the number of drying steps set in the controller, or while the ventilation blower 45 is rotating by inertia toward stopping rotation, the switching damper is activated. 23 is moved from the open position during drying to the closed position during lint removal, and the lint L ( The lint L adhered in a film form is peeled off from the lint adhering surface 22 by the airflow blown in tangentially between the lint and the lint (FIG. 4) and pushed upward (FIG. 5).

After receiving the stop signal, the ventilation blower 45 decelerates toward stopping, so the suction force of the ventilation blower 45 decreases, and the force that tries to stick the film-like lint L to the lint adhesion surface 22 increases. , a point occurs where the force with which the lint L tries to fall off is reversed. A little before that timing (after 10 to 50% of the deceleration time of the ventilation blower has elapsed), air injection from the nozzles 27 and 28 is started to assist in dropping off the clumped lint L (FIG. 5).

As shown in FIG. 3, the air injection from the nozzles 27 and 28 is effectively carried out in an arbitrary cycle consisting of a combination of pulsed instantaneous injection and intermittent injection in cycles of several seconds. Since the ventilation blower 45 stops while the air injection is repeated, there is no longer a force that inhibits the falling of the lint L, and the force of the air injected from the nozzles 27 and 28 promotes the falling off, causing the lint L to fall above the surface on which the lint is attached. The lint L pushed up quickly falls off and falls into the space 25 on the back side of the switching damper 23 (FIG. 6).

The lint lumps that have fallen into the space 25 are sucked up by a suction device installed outside the machine and discharged to the outside of the machine. During the drying operation, this space 25 is closed by the open switching damper 23, so that the lint in the space 25 will not scatter during the drying process and will not adhere to the lint collector 21 again.

The dryer is operated repeatedly in a cycle of loading laundry, drying, and discharging laundry. As a means of automating the loading and unloading of laundry, the air pressure of the ventilation blower 45 is used. That is, when loading or unloading laundry, the damper switches the flow path of the ventilation blower 45 to control the airflow flowing from the laundry input port into the inner drum 11 or from the inside of the inner drum 11 to the laundry discharge port. The airflow is used to load and discharge laundry.

Discharging the laundry needs to be synchronized with the conveyor that transfers the discharged laundry to the next process, so once the drying process is completed, a stop signal is sent to the ventilation blower 45, and synchronization with the discharge conveyor is established. This controls the restart. In such control, a deceleration process of the ventilation blower 45 due to inertia occurs when the drying process ends and when the discharge process ends.

In the case of such a dryer, by dividing the lint removal operation into a plurality of steps, it is possible to shorten the dead time (waiting time) of the dryer required for removing lint. For example, by switching the lint removal operation described above and moving the damper 23 from the open position for drying to the closed position for lint removal, the lint L adhering to the lint adhesion surface 22 is generated by the suction force of the ventilation blower 45 that rotates by inertia. The operation in step 1 of peeling off the lint L and pushing it upward (FIG. 5) causes the lint L pushed up by the air jets from the nozzles 27 and 28 to form a lump to fall off the lint adhering surface 22 and into the space behind the switching damper 23. 25 (FIG. 6), and step 3, in which the lint lump L in the space 25 is discharged to the outside of the dryer using a central suction device (not shown).

FIG. 7 is a time chart in which the operations of steps 1 to 3 are performed as a series of undivided operations, and the operations of steps 1 to 3 are performed when the ventilation blower 45 is decelerated at the end of the laundry discharge process. On the other hand, FIG. 8 is a time chart showing an example in which steps 1 to 3 are performed in divided manner, in which the operation of step 1 is performed during the deceleration of the ventilation blower that is re-driven to discharge the laundry during the discharge process. Therefore, the waste time required for lint removal is shortened by requiring only step 2 to be performed after the discharge process is completed. By performing the lint suction operation in step 3 when the laundry is loaded, waste time is also prevented from occurring in the operation in step 3.

Regarding the operation start timing of each step when performing the divided operation as described above, in step 1, the remaining time of the discharge process, a command to stop the ventilation blower, etc., and in step 2, the time-up signal of the laundry discharge process, the ventilation blower, etc. In step 3, a time-up signal for the laundry discharging process, a laundry loading end command, an elapsed time after the start of the drying process, etc. can be used.

In addition, since the ventilation resistance of the ventilation blower can be reduced only by the operation in step 1 of pushing up the lint attached to the lint adhesion surface 22, it is possible to reduce the ventilation resistance of the ventilation blower. It is also possible to perform control such as performing only the above operation and starting the next drying operation.

A central suction device installed in a large-scale laundry factory performs the step 3 operation of discharging the lint lumps accumulated in the space 25 from a plurality of dryers. Suctioning and discharging the lint mass is a short-time operation, but it requires a certain amount of time. Therefore, the lint block discharge request signals from multiple dryers, each operating at its own timing, may overlap in a short period of time, causing the lint block discharge request to be delayed from other dryers. If the dryer that has been taken out does not wait until its turn has come and the lint lumps are discharged, it will not be able to start the next drying process, which may result in wasted time due to long waiting times.

This problem can be solved by, for example, ordering the lint block discharge request signals received by the central suction device, setting a limit on the number of acceptable lint block discharge request signals or waiting time, and A rejection signal is returned to the dryer that has exceeded the request and the dryer starts the next drying cycle, and when the next lint lump discharge request signal is received from the dryer that issued the rejection signal, it is given the highest priority. By performing control such as performing the lint lump discharge operation in the dryer, the waste time of the entire dryer can be shortened as much as possible.

As shown in Figure 7, if steps 1 to 3 are performed continuously, steps 1 to 3 must be performed between the end of the drying process and the start of the next drying process. Therefore, extra process time is required than when starting the next drying process without performing the lint removal operation. On the other hand, by dividing the lint removal operation into multiple steps, the next drying process can be started at the same time interval as when no lint removal operation is performed. It is possible to prevent the process time from increasing.

The laundry dryer of the embodiment is a gas dryer that uses the combustion heat of the burner 31 to increase the temperature of drying air and speed up drying. In the gas dryer shown in the figure, a suction duct 3 for drying air is disposed in the upper part of the dryer main body 1 in the horizontal direction, and a burner 31 is disposed approximately in the middle of the suction duct. Outside air used as drying air is sucked into the suction duct 3 through the suction port 32, mixed with combustion gas from the burner 31, heated, and guided to the drying air inlet opening 13.

In order to uniformly mix the outside air sucked in from the suction port 32 and the combustion gas of the burner 31, it is preferable to make the length of the duct downstream of the burner 31 long. 31a should be provided so that it is located closer to the suction port 32 than the rotation center N of the inner shell 11 or the center M of the dryer main body (the center of the machine width W).

In the laundry dryer shown in the figure, the exhaust duct 4 is placed over the suction duct 3, and the exhaust gas flowing out from the outlet opening 15 at the upper left of the dryer body 1 in FIG. The exhaust air is introduced into the exhaust duct 4 through the exhaust flow path 47, and is discharged outside the machine from the exhaust port 41 at the upper right side in FIG. 1 at the downstream end of the exhaust duct 4.

A circulation opening 42 for circulating exhaust gas is provided in a partition wall 44 that partitions the exhaust duct 4 and the intake duct 3 at the downstream end of the exhaust duct 4, and a flap valve adjusts the amount of exhaust gas flowing through this circulation opening. 43 are provided. When the circulation opening 42 is closed by the flap valve 43, the entire amount of exhaust gas flowing through the exhaust duct 4 is discharged from the exhaust port 41, and when the flap valve 43 closes the exhaust port 41, the entire amount of exhaust gas flowing through the exhaust duct 4 is discharged from the exhaust port 41. The entire volume of exhaust gas is led through the circulation opening 42 and the downstream end of the suction duct 3 to the inlet opening 13 . By locating the flap valve 43 between the exhaust port 41 and the circulation opening 42, a part of the exhaust gas flows into the suction duct 3 side, mixes with the air that has flowed through the suction duct 3, and is released into the dryer main body. It flows into the inlet opening 13.

This structure streamlines the air flow path of the dryer, which enables exhaust circulation, that is, allows some or all of the exhaust to pass through the inner shell 11 again, reducing the energy consumption of the dryer. It can be made compact and compact.

In the laundry dryer of the embodiment, a negative mix system is adopted as a gas unit that supplies the mixture to the burner 31. As shown in FIG. 9, in the negative mix method, fuel gas C is supplied to combustion air B at the air intake port 34 side of the air supply fan 33, and the combustion air and fuel gas are mixed by an impeller rotating inside the fan 33. This method mixes the ingredients uniformly. By adopting the negative mix method in a laundry dryer, it is possible to make the suction duct after passing through the gas unit and burner compact.

The air supply fan 33 is arranged on the side surface of the suction duct 3, as shown in FIG. Combustion air B is taken in in the axial direction of the air supply fan 33, flows into the air supply fan 33 along with the fuel gas C supplied from the side in the middle of its suction path 35, and is stirred by the stirring action of the rotating impeller. The mixture is passed straight from the outlet of the scroll 36 through the side wall of the suction duct 3 to the burner 31 .

Although details are not shown in the figure, the burner 31 is provided with a pilot burner, and this pilot burner is ignited when combustion in the main burner is stopped. The amount of combustion gas coming out of the burner 31 is adjusted by the rotation speed of the air supply fan 33 and the amount of fuel gas C supplied.

In the illustrated laundry dryer, as shown in FIG. 11, the burner 31 is arranged at the center of the cross section of the suction duct 3, and a baffle plate 37 that partially blocks the flow of intake air around the burner 31 is placed close to the burner 31. It is set up as follows. This baffle plate 37 guides a part of the outside air taken in from the suction port 32 to the flame side of the burner, and the vortex generated behind the baffle plate 37 promotes mixing of the outside air and combustion gas, resulting in a uniform Drying air A at a certain temperature can be obtained. The baffle plate 37 is not limited to the one shown in the figure, but rectangular baffle plates may be provided above, below, left and right of the burner 31, in short, by partially blocking the air flowing around the burner 31. It is fine as long as it leads to the flame side.

In a dryer that performs exhaust circulation, it is desirable to mix the circulated exhaust gas with freshly drawn outside air to supply drying air with uniform temperature and humidity to the inner shell. In the laundry dryer shown in the figure, the opening area of the circulation opening 42 connected from the exhaust duct 4 to the downstream end of the suction duct 3 is made smaller than the cross-sectional area of the exhaust duct 4 and the suction duct 3, By diffusing the circulating air that has flowed to the downstream side of the circulation opening 42, mixing of exhaust air and intake air during exhaust circulation is promoted.

In a laundry dryer that performs exhaust circulation, if the balance between the exhaust circulation rate, which is the ratio of the circulation amount to the exhaust amount, and the amount of intake air is lost, the exhaust gas may flow backwards from the outside air intake port 32 and blow out of the machine. . As a result, the circulation rate could only be set to a level that would prevent exhaust gas from blowing out, and the scope of application of exhaust gas circulation was restricted. This problem can be solved by attaching a flap 38 to the outside air inlet 32, which acts as a check valve, as shown in the figure.

That is, as shown in FIG. 1, a flap 38 is provided at the drying air inlet 32, and when a backflow of air occurs in the inlet duct 3, the flap 38 swings due to the wind pressure and closes the inlet 32. ing. This makes it possible to suppress blowing out of the machine due to backflow of exhaust gas when exhaust gas is circulated, and it becomes possible to set a wide range of circulation rates.

Furthermore, in the dryer of the illustrated embodiment, a temperature sensor 39 is provided at the drying air intake port 32, and when the temperature detected by this sensor increases during exhaust gas circulation, the controller reduces the exhaust gas circulation rate to prevent backflow of the exhaust gas. I am trying to alleviate this. That is, a temperature sensor 39 is attached to the drying air intake port 32, and when this temperature sensor detects high temperature circulating air, the controller operates the flap valve 43 in a direction to reduce the circulation rate, thereby reducing the exhaust gas. This makes it possible to circulate the exhaust gas at an optimal circulation rate that does not cause backflow.

2 Air flow path 14 Ventilation port 21 Lint collector 22 Lint adhering surface 22a Upper side 22b Lower side 23 Switching damper 26 Inflow slit 27 Front nozzle 28 Back nozzle 45 Ventilation blower A Drying air

Claims (2)

An air flow path provided in the vertical direction, a ventilation blower that blows air from below to the top in this air flow path, and an air flow path that is tilted diagonally to capture lint in the air flowing through the air flow path. A vent hole on the upstream side of the lint collector is opened with a lint collector having a lint adhering surface arranged to block the lint collector, and a lint-like inflow slit remaining between the lower side of the lint adhering surface when closed. A lint removal device comprising a switching damper that closes,
one or both of the front nozzle provided close to the upper side of the lint adhesion surface and the back nozzle provided apart from the back side of the lint adhesion surface; and an air tank for supplying pressurized air to these nozzles; and a solenoid valve that is opened and closed by a controller, the front nozzle is arranged to blow out an air flow obliquely downward toward the lint adhesion surface, and the back nozzle is arranged to blow airflow along the lint adhesion surface. It is arranged to blow airflow towards the area below the upper edge of the back ,
The switching damper closes the ventilation port when a stop signal is sent to the ventilation blower or during the subsequent inertial deceleration rotation of the ventilation blower, and the front nozzle and the back nozzle close the ventilation port when the switching damper closes the ventilation port. A lint removal device that injects air after a predetermined period of time after closing . 2. An inner shell that rotates while accommodating washed laundry, said ventilation blower that generates drying air that passes through said inner shell, and removes lint in the air that has passed through said inner shell. A laundry dryer equipped with a lint removal device .

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