JP2019084359A - Lint removal device and laundry dryer - Google Patents

Abstract

To provide means which has a simple structure and which does not generate wasteful time, regarding means for removing lint accumulated on a lint attachment surface of a lint collector for capturing lint in the air flowing in a flow passage and a laundry dryer including the means.SOLUTION: A lint removal device includes: a ventilation blower for flowing air from below to above in an air flow passage provided in the vertical direction; a lint collector including a lint attachment surface arranged so as to cut off the air flow passage obliquely; a switching damper for closing a vent hole on the upstream side of the lint collector by leaving an inflow slit between itself and a lower side of the lint attachment surface when closing; and a back surface nozzle for injecting air to a region below an upper side of the lint attachment surface from the back surface side of the lint attachment surface or a front surface nozzle for injecting air flowing along the lint attachment surface obliquely downward. The lint removal device starts a lint removal operation while decelerating after the ventilation blower receives a stop signal, and normally, finishes the operation after the ventilation blower stops.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an apparatus for removing lint (tongue) provided in an air flow path, and more particularly to an apparatus for removing lint in air flowing through the flow path with a lint collector. The present invention relates to the above-mentioned apparatus characterized by the means for removing lint and a laundry dryer provided with the apparatus.

  In a laundry drier or the like which blows and dries the laundry stored in the machine, lint generated from the laundry mixes in the drying air. In a general dryer, a lint collector is provided in the flow path of the drying air in order to remove the lint from the drying air. The filter surface of this lint collector (the surface on which air flows in. In this specification, it is referred to as the "lint attached surface" and the surface on the outflow side is simply referred to as the "rear surface"). When the machine is operated, air resistance increases, air volume decreases, drying efficiency deteriorates, and drying takes time. For this reason, it is necessary to remove the lint deposited on the lint-adhered surface every several dryings.

  A general method of automatically removing dust such as lint deposited on the lint-adhering surface is a method of flowing air in the reverse direction to the lint collector or rubbing the lint-adhering surface with a brush. The air is jetted from above and in the lateral direction to the boundary between the lint attached to the lint adhering surface and the lint adhering surface to separate and drop the lint from the lint adhering surface, and the dropped lint is collected by the suction fan into the lint box A laundry dryer of construction has been proposed.

  On the other hand, the applicant of the present invention has disclosed in Patent Document 2 an outdoor air introduction damper and an upper side portion, a lower side, and a rear side of a lint-adhered surface of a lint collector obliquely disposed so as to block the air flow path in the vertical direction. The lint removal apparatus which provided the switching damper and the back surface damper is proposed. The switching damper opens the air inflow path on the upstream side of the lint adhesion surface when open and closes the air inflow path to the lint collector with the inflow slit remaining between the side of the lint adhesion surface and the air inflow side when closing. Cut off. On the other hand, the rear surface damper allows air to pass through the entire surface of the lint collector when it is open, and prevents the air from passing while remaining behind the outflow region adjacent to the downstream end of the rear surface when it is closed. The back damper moves in a direction perpendicular to the back surface to close the back except the outflow area.

  In the lint removal device described in Patent Document 2, the air on the back surface of the lint collector is pushed toward the lint attachment surface side by the wind pressure accompanying the closing operation of the rear surface damper to lift the lint attached to the lint attachment surface and close it. The rear damper guides the air flowing in from the inflow slit along the lint-adhering surface, and removes the lint deposited on the lint-adhering surface by the air and the outside air flowing in from the upper side of the lint-adhering surface It is.

JP 2002-113291 A JP, 2009-201864, A

  In the air jet only lint removal apparatus as described in Patent Document 1, when air is jetted to the lint deposited in a film form on the lint adhering surface, only the lint in the part to which the jet stream hits is blown away in a worming manner. There was a problem that was only partially eliminated. There is also a proposal to spray slit-like air, but it is difficult to apply a peeling force uniformly over the entire surface of the lint attached in a film-like form, and it is likely to peel off and scatter in a worm-like manner.

  On the other hand, the means proposed in Patent Document 2 has an advantage that the lint trapped in the lint collector can be removed only by the ventilation blower provided in the machine. However, if the air pressure of the ventilation blower is not sufficient, the lint can not be removed from the lint-adhering surface, and there is a problem that the three dampers, in particular the back damper, have to be closed against the large wind pressure of the ventilation blower. .

  In the laundry drier, the control procedure of the drying process and the control procedure of the lint removal operation are registered in the controller, and the lint removal operation is interrupted during the repeated drying process. Therefore, control is performed to start the lint removal operation after the drying process ends and the ventilation blower decelerates and stops before starting the lint removal, and the time required for stopping the ventilation blower at the end of the drying process and the time required for lint removal The time to accelerate the ventilation blower to the wind pressure was a dead time that did not contribute to the drying of the laundry or the removal of lint.

  Further, in the means of Patent Document 2, since the lint attached by the wind pressure of the ventilation blower is scraped in the direction opposite to the direction in which the wind pressure acts, a force for suctioning a film-like lint attached to the lint attached surface There is also a problem that it takes a long time to remove the lint in relation to the balance between the peeling and dropping forces.

  The present invention relates to an improvement of the lint removal device proposed in Patent Document 2, and reduces the above-mentioned dead time with a simpler structure, and reliably peels off the lint captured by the lint collector in a shorter time. The problem is to obtain a lint removal device that can be removed by

  In the lint removal apparatus according to the present invention, the rear surface damper in the lint removal apparatus proposed in Patent Document 2 is replaced with a rear surface that jets air from the rear surface side of the lint attachment surface 22 of the lint collector to the area under the upper side of the lint attachment surface. A front nozzle 27 is provided on the upper side of the nozzle 28 or the lint attachment surface 22 for injecting air flowing along the lint attachment surface obliquely downward. Although it is preferable to provide both the front side nozzle 27 and the back side nozzle 28, only one side may be used, and when only one side is provided, it is preferable to provide the back side nozzle 28.

  The lint removal apparatus according to the present invention starts the lint removal operation during deceleration after the ventilation blower 45, which distributes air in the air flow path 2 in which the lint collector 21 is disposed, receives a stop signal. Exit after 45 stops.

  The lint removal apparatus according to the present invention captures the lint in the air flowing through the air flow path 2 provided in the vertical direction, the ventilation blower 45 flowing air from the lower side to the upper side in the air flow path, and the air flow path 2 In order to block the air flow path, a slit-like inflow slit 26 is left between the lint collector 21 provided with the lint adhesion surface 22 and the lower side 22b of the lint adhesion surface at the time of closing. And a switching damper 23 for closing the vent 14 on the upstream side of the lint collector.

  Furthermore, according to the lint removal apparatus of the present invention, one or both of the front nozzle 27 provided close to the upper side 22 a of the lint attached surface 22 and the rear nozzle 28 provided away from the back of the lint attached surface 22 Have. The front nozzle 27 is disposed so as to blow an air flow along the lint adhesion surface obliquely downward toward the lint adhesion surface 22, and the rear nozzle 28 is directed to a region below the upper side 22a of the lint adhesion surface It is arranged to blow out.

  The switching damper 23 closes the air vent 14 at the time of deceleration of the ventilation blower 45 after the stop signal is sent, and the front nozzle 27 and the back nozzle 28 a predetermined time after the switching damper 23 closes the vent 14 Jet the air. It is preferable that the air injection from these nozzles is performed in a mode in which the injection and the injection stop are repeated in a predetermined cycle. The air injection of these nozzles 27, 28 usually continues until after the ventilation blower 45 has actually stopped.

  The lint removal apparatus of the present invention is particularly suitable as a lint removal apparatus for a business-use laundry drier, in which the drying step of drying the washed laundry with the drying air A is continuously repeated.

  In the lint removal apparatus according to the present invention, the lint adhering to the lint-adhered surface of the lint collector is pushed up and collected by utilizing the inertia rotation of a ventilation blower that causes air to flow through the lint collector, and lumps of lint are temporarily collected. Since the lint attached to the lint-adhering surface is prevented from coming off in a worm-like manner by spraying air from the nozzle aiming at the lump, the entire lint on the lint-adhering surface is smoothed. It can be removed.

  In addition, since the lint removal operation is started during deceleration to stop the ventilation blower 45 and ended when the ventilation blower 45 is stopped, a machine in which the rotation of the ventilation blower is repeatedly stopped like a laundry dryer. The removal of the lint from the lint collector 21 can be performed without wasting time.

Cross-sectional front view of the laundry dryer of the embodiment Front view showing the rotary drive system of the inner barrel Time chart showing the lint removal operation in the laundry dryer Side view of the lint collector during the drying operation viewed from the front of the laundry dryer A view similar to FIG. 4 during the lint removal operation A view similar to FIG. 4 immediately before the end of the lint removal operation A time chart showing an example of performing a lint removal operation by a series of operations A time chart showing an example in which the lint removal operation is performed by dividing it into steps 1 to 3 Cross-sectional plan view of the suction duct of the laundry dryer of FIG. 1 Cross-sectional plan view of the same exhaust duct Cross-sectional side view mainly showing the flow path of the same exhaust

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings showing an example of a commercial laundry dryer provided with the lint removal device of the present invention. The laundry dryer shown in the figure has a structure in which the laundry introduced into the inner cylinder 11 rotating around the horizontal axis in the dryer main body 1 is dried by the drying air A passing through the inner cylinder in the diameter direction. is there. The inner barrel 11 is provided with a circumferential surface through which the drying air A such as a wire mesh can pass, and a baffle 12 is appropriately provided inside thereof. In the axial direction both ends (the front and the back of the paper surface of FIG. 1) of the inner cylinder 11 are provided with an inlet and an outlet for the laundry, and the laundry inserted into the inner cylinder 11 is rotated by the inner cylinder 11. The operation of scraping up and dropping down by the baffle 12 is repeated, during which the laundry dried by the drying air A flowing in the inner cylinder is discharged from the discharge port to the next step.

  As shown in FIG. 2, the inner barrel 11 supports four inner barrels supported by the bottom of a circular holding frame provided at each end of the inner barrel 11 in the axial direction (the direction perpendicular to the sheet of FIG. 2). It is supported by a roller 51. The driving 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, since the heavy laundry containing moisture is accumulated at the bottom of the inner shell 11, a driving force is required to rotate the inner shell 11 against the gravity.

  The inner cylinder 11 is rotationally driven by the frictional force of the circumferential surface of the drive roller 51, but the belt 53 and the drive roller 51 are caused due to an increase in rotational resistance of the inner cylinder 11 and a decrease in the coefficient of friction of the drive roller 51. May slide, and even if the drive motor 52 is rotating, the inner cylinder 11 may not rotate. Such abnormal rotation of the inner cylinder 11 can not be known only by detecting the rotation of the drive motor 52, and if the operation is continued without being noticed, the drying failure, breakage of machine parts, damage to the laundry during drying, etc. Occur.

  In order to avoid this problem, the laundry drying machine shown in the figure is provided with rotation detection means for directly detecting the rotation of the inner cylinder 11. As the rotation detecting means, a means for providing a sensor 54 for separately detecting the outer peripheral surface of the holding frame of the inner barrel 11 in two colors of white and black and optically detecting a color difference, and a metal piece attached to the holding frame are magnetically Can be exemplified. By directly detecting that the inner cylinder 11 is rotating by such means, it is possible to prevent the drying failure due to the rotation abnormality of the inner cylinder 11 and the breakage of the laundry and the machine.

  The drying air A flows into the dryer main body 1 from the inlet opening 13 provided at the upper right of FIG. 1 by the rotation of the ventilation blower 45 provided at the outlet opening 15 portion of the dryer main body 1 and crosses the inner cylinder 11 Flow into the air flow path 2 from the lower left vent 14. After the lint in the passing air is removed by the lint collector 21 provided so as to block the air flow path 2, the drying air A having passed through the vent 14 is then exited at the upper left of FIG. It flows out from the opening 15 to the exhaust duct 4. In the dryer main body 1, partition walls 16, 17 and 18, 19 are provided for guiding the drying air A to flow across the inside of the inner cylinder 11. The ventilation blower 45 is rotationally driven by an inverter motor 46 whose rotational speed is controlled by a controller (not shown).

  The air vent 14 is provided with a switching damper 23 pivotally mounted on the lower side 23 b so as to open and close the air vent 14. In the air flow path 2, the lint collector 21 blocks the air flow path 2 obliquely so that the upper side 23 a of the switching damper 23 in the closed state and the lower side 22 b of the lint attachment surface are adjacent to each other. It is fixed to

  The switching damper 23 is opened and closed by the expansion and contraction operation of an air cylinder 24 installed between the upper side 23 a and the immovable position of the dryer main body. When opened, the switching damper 23 swings to close the space 25 on the back side of the damper to open the vent 14, and when closed, opens the space 25 and the upper side 23a thereof. The vent 14 is closed with the slit-like inflow slit 26 remaining between the lower side 22b 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-adhered surface 22 of the lint collector 21 so as to blow the air flow along the lint-adhered surface obliquely downward. On the back surface side of the lint collector 21, a back surface nozzle 28 is provided which blows an air flow toward the area below the upper side 22a of the back surface of the lint attached surface 22 at a distance of 10 to 100 mm from the lint attached surface 22. It is preferable to use a circular flow-out type air nozzle with a large flow rate as the back surface nozzle 28. One or more of these nozzles 27 and 28 are provided according to the area of the lint collector 21, and factory air or air pressurized by a compressor via solenoid valves 56 and 57 opened and closed by a controller from the air tank 55 Is supplied.

  When the nozzles 27 and 28 are provided closely to the lint-adhered surface 22, the sprayed air strikes the lint before the air is sufficiently spread, and the lint deposited in the form of a film is peeled off and blown off. If the nozzles 27 and 28 are provided apart from the lint-adhering surface 22 to a certain extent, the jetted air spreads and the pressure of the jet is transmitted over a relatively wide range, so that it is possible to prevent the lint from partially peeling and scattering.

  By passing through the laundry, lint is mixed in the exhaust air of the drying air. When the lint contained in the exhaust passes through the lint collector 21, it adheres to the lint attached surface 22. When the laundry is dried several times, the lint deposits in a film form on the lint-adhered surface 22 to prevent the passage of the drying air A. The pressure drop of the pressure gauge provided on the back side of the lint collector 21 or the increase in the pressure difference of the pressure gauge provided on the front and the back for each number of times of drying operation set according to the type of laundry to be dried When is detected, the removal operation of the lint adhering to the lint adhesion surface 22 is performed.

  The removal operation of lint in the lint removal apparatus according to the present invention is, as shown in the time chart of FIG. 3, when the immediately preceding drying step is completed and a stop signal is sent to the ventilation blower 45 or when the blower is decelerated thereafter. It is started. When the drying process for the number of times set in the controller is completed and the controller outputs a stop signal of the ventilation blower 45 or after that, while the ventilation blower 45 is rotating in a direction to stop rotation, the switching damper 23 is moved from the open position at the time of drying to the closed position at the time of lint removal, and lint L adhering to the lint adhering surface 22 in a film form through the inflow slit 26 by the suction force of the draft blower 45 rotating in inertia. The lint L adhering in the form of a film is peeled off from the lint-adhered surface 22 by an air flow blown in a tangential direction between the sheet and the sheet shown in FIG.

  After receiving the stop signal, the ventilation blower 45 decelerates toward the stop, so the suction force of the ventilation blower 45 decreases and the force to stick the film-like lint L to the lint adhesion surface 22 , The point at which the force for Lint L to fall is reversed. Slightly before that timing (after 10 to 50% of the deceleration time of the ventilation blower), air injection of the nozzles 27 and 28 is started to assist dropping of the lump L (FIG. 5) that has become lumpy.

  As shown in FIG. 3, it is effective to carry out the air injection from the nozzles 27 and 28 in an arbitrary cycle consisting of a combination of pulsed instantaneous injection and intermittent injection of several seconds cycle. Since the ventilation blower 45 is stopped while the air injection is repeated, there is no force that inhibits the removal of the lint L, and the force of the air jetted from the nozzles 27, 28 promotes the detachment and the upper side of the lint attached surface The lint L pushed up quickly drops out and falls into the space 25 on the back of the switching damper 23 (FIG. 6).

  Lint lumps dropped into the space 25 are sucked by the suction device installed outside the machine and discharged out of the machine. During the drying operation, the space 25 is closed by the open switching damper 23 so that lint in the space 25 does not scatter during the drying process and adhere to the lint collector 21 again.

  The operation of the drier is repeatedly performed with one cycle of loading of laundry → drying → discharging of laundry. The air pressure of the ventilation blower 45 is used as a means for automating the input and output of the laundry. That is, at the time of charging or discharging of the laundry, the flow path of the ventilation blower 45 is switched by the damper to flow the air flowing from the laundry inlet into the inner shell 11 or the air from the inside of the inner shell 11 to the laundry outlet. It generates and inputs and discharges the laundry by the air flow.

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

  In the case of such a drier, it is possible to reduce the dead time (waiting time) of the drier required for removing the lint by dividing the lint removal operation into a plurality of steps. For example, the lint removal operation is performed by moving the switching damper 23 from the open position at the time of drying to the closed position at the time of lint removal and adhering to the lint adhering surface 22 by the suction force of the ventilation blower 45 rotating in inertia. 5 and peeling the lint L pushed up and lumped up by the air jets of the nozzles 27 and 28 from the lint adhesion surface 22 and the space in the back of the switching damper 23 The operation is divided into the operation of step 2 dropping to 25 (FIG. 6), and the operation of step 3 of discharging the lint lump L in the space 25 to the outside of the dryer by the centralized suction device not shown.

  FIG. 7 is a time chart in the case where the operations of steps 1 to 3 are performed as a series of operations not divided, 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 divided and performed, the operation of step 1 is performed at the time of deceleration of the redriven ventilation blower for discharging the laundry during the discharging process. Thus, by setting the operation to be performed after the end of the discharging process only to Step 2, the dead time required for lint removal is shortened. And, by performing the lint suction operation of step 3 at the time of the input of the laundry, it is also prevented that a dead time is generated in the operation of step 3.

  For the operation start timing of each step when performing the division operation as described above, the remaining time of the discharge process in step 1, the stop command of the ventilation blower, etc. in step 1, the time up signal of the laundry discharge process in step 2, the ventilation blower In step 3, the time-up signal of the laundry discharge process, the laundry input termination command, the elapsed time after the start of the drying process, and the like can be used, such as the stop command of laundry and the laundry input start command.

  Further, since the ventilation resistance of the ventilation blower can be reduced only by the operation of step 1 that pushes up the lint adhered to the lint adhesion surface 22 upward, control for performing the operation of step 1 at the timing of D in FIG. It is also possible to perform control such as performing the following drying operation by performing only the operation of.

  The centralized suction device installed in a large-scale laundry factory performs the operation of step 3 for discharging lint lumps accumulated in the space 25 for a plurality of dryers. Lint mass suction and discharge is a short time operation, but requires a certain time. Therefore, it may happen that Lint mass discharge request signals from multiple driers, each operating at its own timing, appear in duplicate for a short time, and Lint mass discharge requests are delayed from other driers. If the driers are taken out of order and wait until the lint mass is discharged, there is a risk that waste time will occur due to waiting for a long time without entering the next drying step.

  The problem is, for example, ordering the lint mass discharge request signals received by the central suction device, setting the number of acceptable lint mass discharge request signals or setting the limit of the waiting time, and setting the number and setting time For the dryer that has requested over, it sends a rejection signal to make the dryer start the next drying cycle, and when it receives the next Lint mass discharge request signal from the dryer that has issued the rejection signal, it receives the highest priority. The waste time of the whole drier can be reduced as much as possible by performing control such that the lint mass discharging operation is performed.

  As shown in FIG. 7, when the lint removal operation of steps 1 to 3 is continuously performed, steps 1 to 3 must be performed between the end of the drying step and the start of the next drying step. This requires extra process time than starting the next drying step without the lint removal operation. On the other hand, by performing the lint removal operation divided into a plurality of steps, the next drying step can be started at the same time interval as when the lint removal operation is not performed, so for lint removal operation It is possible to prevent the process time from becoming long.

  The laundry dryer of the embodiment is a gas dryer that uses the heat of combustion of the burner 31 to raise the temperature of the drying air to accelerate the drying. In the gas dryer shown in the figure, a suction duct 3 for drying air is disposed laterally in the upper part of the dryer main body 1, and a burner 31 is disposed at a substantially intermediate position of the suction duct. Outside air used as drying air is drawn into the suction duct 3 from the suction port 32, mixed with the combustion gas of the burner 31, heated, and led to the inlet opening 13 of the drying air.

  It is preferable to increase the length of the duct downstream of the burner 31 in order to uniformly mix the ambient air drawn in from the suction port 32 and the combustion gas of the burner 31. For that purpose, the nozzle tip of the burner 31 31a should be located closer to the suction port 32 than the rotation center N of the inner cylinder 11 or the center (center of the machine width W) M of the dryer main body.

  In the laundry dryer shown in the figure, the exhaust duct 4 is disposed so as to overlap the suction duct 3, and the exhaust flowing out from the outlet opening 15 at the upper left portion in FIG. 1 of the dryer main body 1 penetrates the suction duct 3 up and down. The air is introduced into the exhaust duct 4 through the exhaust flow path 47, and is discharged to the outside from the exhaust port 41 on the upper right of the downstream end of the exhaust duct 4 in FIG.

  A circulation opening 42 for circulating the exhaust is provided in a partition 44 which divides the exhaust duct 4 at the downstream end of the exhaust duct 4 and the suction duct 3 and a flap valve for adjusting the amount of the exhaust flowing through the circulation opening 43 are provided. In a state in which the circulation opening 42 is closed by the flap valve 43, the entire amount of exhaust flowing through the exhaust duct 4 is discharged from the exhaust port 41, and in a state in which the exhaust port 41 is closed by the flap valve 43 The entire amount of exhaust is led to the inlet opening 13 through the circulation opening 42 and the downstream end of the suction duct 3. By positioning the flap valve 43 at an intermediate position between the exhaust port 41 and the circulation opening 42, a part of the exhaust flows into the suction duct 3 side, and is mixed with the air flowing through the suction duct 3 to form the dryer body. It flows to the entrance opening 13.

  Such a structure streamlines the exhaust gas circulation, that is, the air flow path of the drier, which allows an operation of allowing part or all of the exhaust gas to pass again into the inner cylinder 11 to reduce the energy consumption of the drier. And can be formed compactly.

  In the laundry drier of the embodiment, a negative mix system is adopted as a gas unit for supplying the mixture to the burners 31. In the negative mix method, as shown in FIG. 9, the combustion air and the fuel gas are supplied by the impeller rotating in the fan 33 by supplying the fuel gas C to the combustion air B on the air intake port 34 side of the air supply fan 33. Are uniformly mixed. By adopting the negative mix method in the dryer of the laundry, it is possible to make the suction duct compact after passing through the gas unit and the burner.

  The air supply fan 33 is disposed on the side surface of the suction duct 3 as shown in FIG. The combustion air B is sucked in the axial direction of the air supply fan 33, flows into the air supply fan 33 together with the fuel gas C supplied from the side along the suction passage 35, and is stirred by the rotating impeller. The mixed gas is led straight from the outlet of the scroll 36 through the side wall of the suction duct 3 to the burner 31.

  Although not shown in detail in the drawing, the burner 31 is provided with a pilot burner, and when the combustion of the main burner has stopped, this pilot burner is ignited. The amount of combustion gas emitted from the burner 31 is adjusted by the number of rotations of the air supply fan 33 and the amount of fuel gas C supplied.

  In the laundry dryer of the figure, as shown in FIG. 11, the burner 31 is disposed at the center of the cross section of the suction duct 3 and the baffle plate 37 partially blocking the flow of intake air around the burner 31 is close to the burner 31. Provided. The baffle plate 37 guides a part of the outside air sucked from the suction port 32 to the flame side of the burner and swirls generated behind the baffle plate 37 to promote mixing of the outside air and the combustion gas, resulting in evenness. Drying air A at a temperature can be obtained. The baffle plate 37 is not limited to the one as shown in the figure, but a rectangular baffle plate may be provided on the top, bottom, left, and right of the burner 31. Anything that leads to the flame side is acceptable.

  In a dryer performing exhaust gas circulation, it is desirable to supply the drying air with uniform temperature and humidity to the inner barrel by mixing the circulated exhaust gas with the newly drawn outside air. 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 flowing to the downstream side of the circulation opening 42, the mixing of the exhaust gas and the intake air during the exhaust gas circulation is promoted.

  In a laundry dryer that carries out exhaust circulation, when the balance between the exhaust circulation rate, which is the ratio of the amount of circulation to the amount of exhaust, and the amount of intake air breaks down, the exhaust may flow back from the outside air inlet 32 and blow out outside the machine . Therefore, only the circulation rate to the extent that the exhaust gas does not blow out can be set, and the application range of the exhaust gas circulation is restricted. This problem can be solved by attaching a flap 38 acting as a check valve to the outside air intake 32 as shown in the figure.

  That is, as shown in FIG. 1, a flap 38 is provided at the suction port 32 for drying air, and when air flows backward in the suction duct 3, the flap 38 is swung by the wind pressure to close the suction port 32. ing. As a result, it becomes possible to suppress the blowout due to the backflow of the exhaust when the exhaust gas circulation is performed, and it becomes possible to set the circulation rate widely.

  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 rises during exhaust circulation, the controller reduces the exhaust circulation rate to cause the exhaust backflow. To ease. That is, when the temperature sensor 39 is attached to the drying air intake port 32 and the temperature sensor detects high temperature circulating air, the controller operates the flap valve 43 in the direction to decrease the circulation rate, thereby exhausting the exhaust gas. It is possible to perform exhaust gas recirculation at an optimal circulation rate that does not cause backflow of the

Reference Signs List 2 air flow path 14 air vent 21 lint collector 22 lint attached surface 22 a upper side 22 b lower side 23 switching damper 26 inflow slit 27 front nozzle 28 back nozzle 45 air blower blower A drying air

Claims (4)

An air flow path provided in the vertical direction, a ventilation blower for flowing air from the lower side to the upper side in the air flow path, and an oblique flow path for capturing the lint in the air flowing in the air flow path. The vent on the upstream side of the lint collector is left with a slit-like inflow slit between the lint collector with the lint adhesion surface arranged to block and the lower side of the lint adhesion surface at the time of closing. In the lint removal device provided with a closing damper,
One or both of a front nozzle provided close to the upper side of the lint-adhered surface and a rear nozzle provided apart from the back of the lint-adhered surface, the front nozzle being inclined toward the lint-adhered surface A lint removal apparatus, which is arranged to blow air flow downward along the lint-adhered surface, and the back nozzle is arranged to blow air flow toward the lower region of the upper side of the back surface of the lint-adhered surface.   The switching damper closes the vent when the stop signal is sent to the ventilating blower or during the inertia decelerating rotation of the ventilating blower thereafter, and the switching damper serves as a vent when the front nozzle and the back nozzle The lint removal device according to claim 1, wherein air is injected after a predetermined time after closing.   An inner cylinder that accommodates and rotates the laundry after washing, the ventilation blower that generates drying air that penetrates the inner cylinder, and lint in the air that has passed through the inner cylinder. A laundry dryer equipped with the lint removal device described.   The laundry drier according to claim 3, further comprising rotation detection means for directly detecting the rotation stop of the inner cylinder.

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