JP2006308191A - Integrated air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with cleaning of a flow passage by removing impurities contained in drain water. <P>SOLUTION: A switch 46 for switching a delivery destination of the drain water from a pump between an inside flow passage and an outside flow passage comprises a drain joint 60 which is a part of the inside flow passage, and a drain cock 61 which is a part of the outside flow passage and switches the flow passage. The drain cock 61 is detachably attached to the drain joint 60, and a strainer 62 catching and removing the impurities contained in the drain water is attached to the drain cock 61. The drain water always passes through the strainer 62, and the impurities are caught by the strainer 62. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an integrated air conditioner that accumulates drain water generated by a refrigeration cycle operation such as a cooling operation or a dehumidifying operation and processes the drain water.

  Generally, in an integrated air conditioner, a compressor, an evaporator, a condenser, an evaporator fan, and a condenser fan are incorporated in a main body. Drain water is generated when the indoor air is taken in during the cooling operation and the indoor air is cooled by the evaporator.

As described in Patent Document 1, for example, this drain water is stored in a water reservoir, and the drain water is pumped from the water reservoir by a pump and stored in a tank. Remove this tank from the cabinet and discard the drain water. At this time, a rib is provided around the suction port of the pump so as to prevent the pump from sucking impurities such as dust.
Japanese Patent Laid-Open No. 11-108390

  However, you can stop the trash that gets caught in the above ribs, but small trash can pass through the ribs and be sucked into the pump. And garbage flows through a flow path such as a hose, which causes clogging of the pump and the flow path. Moreover, when performing the internal process which evaporates drain water through a condenser, impurities, such as dust contained in drain water, adhere to a condenser, and cause the fall of the heat exchange performance of a condenser.

  Therefore, it is necessary to wash the inside of the pump, the flow path, and the condenser. By the way, it is conceivable to perform cleaning using a cleaning liquid. However, since sewage is generated, this processing becomes a problem, and the user cannot always clean.

  In view of the above, an object of the present invention is to provide an integrated air conditioner that allows a user to easily clean impurities contained in drain water.

  The present invention includes a compressor, a condenser, and an evaporator installed in a cabinet, a reservoir for storing drain water generated by refrigeration cycle operation, drainage means for discharging the drain water from the reservoir, and drain water in the cabinet. An internal flow path to be circulated for processing in the process, an external flow path for draining drain water to the outside of the cabinet, and a switch for switching the flow path, and removing impurities contained in the drain water in the switch A strainer is provided, and the switch is detachable from the cabinet.

  The drain water flows through the switch to the internal channel or the external channel. Since the switcher is provided with a strainer, the drain water always passes through the strainer, and impurities contained in the drain water are captured by the strainer. And since a switching device can be removed, a strainer can also be taken out. Therefore, the strainer can be easily cleaned.

  The switching device includes a drain joint that is interposed in the internal flow path and forms a part of the internal flow path, and a drain cock that is detachably attached to the drain joint and opens and closes the flow path in the drain joint. The drain cock protrudes outside the cabinet to form a part of the external flow path, and a strainer is attached to the drain cock.

  Thus, since the drain cock can be easily removed, the strainer can be easily removed from the cabinet. Here, if the strainer is made detachable from the drain cock, the impurities can be completely removed by taking out and washing the strainer, thereby preventing the strainer from being clogged.

  According to the present invention, since the strainer is provided so that it can be easily taken out, the strainer can be easily cleaned. Therefore, since the performance can be maintained by washing the strainer, impurities contained in the drain water can be removed, and the flow of the drain water can be made smooth without clogging the pump and the flow path. Therefore, it is not necessary to clean the pump and the flow path, and maintenance is facilitated. Further, when drain water is evaporated through a condenser, the impurities are removed from the drain water, so that the impurities do not adhere to the condenser. Therefore, the heat exchange performance of the condenser does not deteriorate, and an efficient refrigeration cycle operation can be performed.

  In the integrated air conditioner of this embodiment, as shown in FIGS. 1 and 2, a cabinet 1 is equipped with a compressor 2, a condenser 3, an evaporator 4, and a throttle mechanism (not shown). A cycle is formed. The air conditioner performs a cooling operation for generating cold air to cool the room. Therefore, the air conditioner includes a blower fan 5 for the evaporator 4, an exhaust fan 6 for the condenser 3, an exhaust duct 7, and a pump 8 for treating drain water generated by the cooling operation. Yes.

  The cabinet 1 has a structure surrounded by a front panel 10, a pair of left and right side plates 11, and a back plate 12, as shown in FIGS. The cabinet 1 is partitioned into an upper cooling chamber 13 and a lower exhaust heat chamber 14. The cooling chamber 13 and the exhaust heat chamber 14 are partitioned by a partition plate 15, and the upper and lower spaces are thermally insulated.

  The cooling chamber 13 accommodates the evaporator 4 and the blower fan 5, and the exhaust heat chamber 14 accommodates the compressor 2, the condenser 3, the exhaust fan 6, and the pump 8. In the cooling chamber 13, the evaporator 4 is disposed on the front side, and the blower fan 5 including a sirocco fan is disposed on the back side. In the heat exhaust chamber 14, the condenser 3 is disposed on the front side, and the exhaust fan 6 including a sirocco fan is disposed on the back side. Between the condenser 3 and the exhaust fan 6, the compressor 2 and the pump 8 are arrange | positioned at right and left, respectively. The condenser 3 is located below the evaporator 4, and the evaporator 4 and the condenser 3 are lined up and down.

  The front side of the cabinet 1 is opened, and this opening is covered with the front panel 10. The evaporator 4 and the condenser 3 face the opening, and a gap 16 is formed between the front panel 10 and the evaporator 4 and the condenser 3. A filter 17 is detachably attached to the gap 16.

  A front suction port 20 and an air outlet 21 are formed in the front panel 10. Further, a side suction port 22 is formed between the front panel 10 and the side plate 11. The front suction port 20 is located in the center of the front panel 10 and is arranged in the vertical direction. The front suction port 20 and the side suction port 22 communicate with the gap 16. The blower outlet 21 is located in the upper part of the front panel 10, and is opened toward the diagonally upward direction from the horizontal direction. The air outlet 21 is provided with a louver 23, and the louver 23 is swung by a motor. The blower outlet 21 communicates with the cooling chamber 13, and a ventilation path is formed from the front suction port 20 and the side suction port 22 through the evaporator 4 to the blower outlet 21. Thereby, the suction from the front surface of the cabinet 1 and the forward blowing can be realized.

  The exhaust heat chamber 14 projects to the back side of the cooling chamber 13, and an exhaust port 24 is formed on the upper surface of the exhaust heat chamber 14. One end of a bellows-like duct 7 is attached to the exhaust port 24. The other end of the duct 7 is attached to the opening of the wall 25, and the exhaust heat chamber 14 communicates with the outside via the duct 7. Therefore, in the exhaust heat chamber 14, a ventilation path is formed from the front suction port 20 and the side suction port 22 through the condenser 3 to the exhaust port 24. This ventilation path communicates with the duct 7 and communicates with the outside.

  One end of the duct 7 is rotatable and detachable with respect to the exhaust port 24. That is, the fan guard 27 is rotatably fitted in the exhaust port 24 formed in the casing 26 of the exhaust fan 6. A duct connector 28 is provided at one end of the duct 7. The duct connector 28 is detachably attached to the fan guard 27, but the duct connector 28 is attached so as not to rotate with respect to the fan guard 27. As the duct 7 and the fan guard 27 rotate integrally, the duct 7 and the cabinet 1 rotate relatively.

  The other end of the duct 7 is detachably attached to the opening of the wall 25. That is, the mounting panel 31 for mounting the duct 7 is fixed to the window frame using the window 30 in the opening. The window 30 may be either a raising / lowering window or a sliding window, and the length of the mounting panel 31 can be varied according to the size of the window 30.

  A duct holder 33 is fitted into the attachment port 32 of the attachment panel 31, and a duct connector 34 provided at the other end of the duct 7 is detachably attached to the duct holder 33. By attaching the duct connector 34 to the duct holder 33, the duct holder 33 is attached so as not to be detached from the attachment panel 31. A rain guard 35 is attached to the outdoor side of the duct holder 33 so that rain does not enter. Therefore, by removing the duct connector 34 from the duct holder 33, the duct 7 can be removed from the window 30, and the duct holder 33 can also be detached from the mounting panel 31. Here, when the duct 7 is removed, the attachment port 32 of the attachment panel 31 remains open, so that a cover for closing the attachment port 32 is provided on the attachment panel 31. In FIG. 1, reference numeral 36 denotes a ventilation hole to which a ventilation fan can be attached.

  A wheel 40 is attached to the bottom surface of the cabinet 1. Therefore, this air conditioner can be moved and can be moved indoors with the duct 7 being extendable. Further, by removing the duct 7, the air conditioner can be carried into another room and can be used in any place.

  By the way, in the evaporator 4, when performing heat exchange of indoor air, the water | moisture content in air will condense and drain water will generate | occur | produce. A drain pan 41 that receives drain water is provided below the evaporator 4, and a drip pan 42 is provided below the drain pan 41. The drain pan 41 is accommodated in the dropping tray 42, and the dropping tray 42 is attached to the cabinet 1. The drain water dripped onto the drain pan 41 flows down to the dropping tray 42 and further flows from the dropping tray 42 to the condenser 3. The drain water evaporates while cooling the condenser 3 when passing through the condenser 3. A drain tray 43 is provided below the condenser 3, and drain water that has flowed through the condenser 3 accumulates in the drain tray 43. The drain tray 43 is placed on the bottom of the heat exhaust chamber 14, and the drain tray 43 is formed with a drain hole 44 and plugged. When the stopper is removed, drain water is discharged.

  Then, in order to perform the internal treatment by circulating the drain water accumulated in the drain tray 43, the drain water is again led to the condenser 3 by the pump 8 and evaporated. The pump 8 is installed in a drain tray 43, a drain hose 45 is connected to the pump 8, and a drain hose 44 is connected to the dropping tray 42. The pump 8 serves as a drainage means, the drain tray 43 serves as a water reservoir, and an internal flow path that connects the drain tray 43 and the dropping tray 42 is formed by the drain hose 45.

  The pump 8 sucks the drain water and sends it to the dropping tray 42. The drain water flows down from the dropping tray 42 and is evaporated by the heat of the condenser 3. In this way, by circulating the drain water, internal treatment can be performed without draining the drain water to the outside.

  And the external flow path for discharging | emitting drain water from the drain pan 43 to the exterior of the cabinet 1 is formed, and the external flow path has branched from the middle of the drain hose 45. FIG. A switch 46 is provided at the branch portion in the drain hose 45 to switch the flow path for drain water between an internal flow path and an external flow path. The switch 46 protrudes outside the cabinet 1, and a drain hose 47 is connected to the switch 46, and the switch 46 constitutes a part of the external flow path.

  As shown in FIG. 5, the air conditioner includes a control device 50 that drives and controls the compressor 2, the blower fan 5, the exhaust fan 6, and the pump 8. A control device 50 including a microcomputer is built in the cabinet 1 and executes various operations such as a cooling operation, a dehumidifying operation, and a ventilation operation in response to an operation signal from a remote controller 51 or an operation switch provided in the cabinet. Further, the front panel 10 is provided with a display 52 made of LEDs and the like, and the control device 50 controls the lighting of the display 52 according to various operations. Further, a water level detector 53 is provided in the drain pan 43, and the control device 50 controls the operation and each operation of the pump 8 according to the amount of accumulated drain water, and as a warning when the drain water becomes full. Control such as lighting or blinking of the display 52 is performed.

  A drain button 54 for operating the pump 8 is provided in the cabinet 1. When the drain button 54 is operated, the pump 8 is forcibly operated for a predetermined time. It should be noted that the existing operation button for starting the cooling operation may be shared and used as the drain button 54. In this case, when starting operation, the operation button is pressed once. When functioning as the drain button 54, the operation is different from usual, such as long pressing or continuous pressing multiple times. When such an operation is performed, the control device 50 activates the pump 8.

  Further, a switching detector 55 that detects the switching state of the switch 46 is provided. The switch detector 55 detects the switch position of the switch 46. The control device 50 determines whether the current flow path is an internal flow path or an external flow path from the detected switching state. Then, it is determined whether or not the flow path of the drain water is appropriate for the selected operation, and when the flow path is not suitable for the selected operation, the user is notified or the execution of the operation is restricted.

  In the cooling operation, room air is sucked from the front suction port 20 and the side suction port 22 by driving the blower fan 5 and passes through the evaporator 4 from the gap 16 of the front panel 10. At this time, the sucked air is cooled by the evaporator 4 and becomes cold air. The cold air is blown out into the room from the air outlet 21.

  On the other hand, by driving the exhaust fan 6, room air is sucked from the front suction port 20 and the side suction port 22 and passes through the condenser 3 from the gap 16 of the front panel 10. At this time, the sucked air is warmed by the condenser 3 and becomes warm air. The warm air passes through the duct 7 from the exhaust port 24 and is discharged outside the room.

  The drain water generated from the evaporator 4 by the cooling operation flows down and accumulates in the drain tray 43. When the drain water accumulates to a predetermined water level, the pump 8 is actuated to pump up the drain water in the drain pan 43 and guide it to the dropping pan 42 through the internal flow path. The drain water drawn up flows down along the surface of the condenser 3 and evaporates. The drain water that has not evaporated is collected in the drain tray 43, pumped up again, and circulated until it evaporates. In this way, internal treatment of drain water is performed.

  In the dehumidifying operation, the compressor 2, the blower fan 5, the exhaust fan 6, and the pump 8 are driven and controlled as in the cooling operation. The drain water accumulated in the drain pan 43 is not circulated, flows through the external flow path, and is discharged from the switch 46 through the drain hose 47 to the outside. In this case, the duct 7 is removed. The air dehumidified through the exhaust heat chamber 14 is exhausted from the exhaust port 24 into the room. Therefore, dehumidification can be performed without changing the indoor temperature.

  In the ventilation operation, the compressor 2, the blower fan 5, and the pump 8 are stopped, and only the exhaust fan 6 is driven. Indoor air sucked from the front of the cabinet 1 is discharged from the heat exhaust chamber 14 through the duct 7 to the outside. At this time, outdoor air enters from the ventilation hole 36 of the wall 25, and ventilation of the room is performed.

  Here, the switch 46 is shown in FIGS. The switch 46 includes a drain joint 60 interposed in the internal flow path, and a drain cock 61 that is detachably and rotatably mounted on the drain joint 60. The drain cock 61 is provided with a strainer 62 for removing impurities such as dust contained in the drain water.

  As shown in FIGS. 8 to 10, the drain joint 60 has a cylindrical holding portion 63 whose one end is closed, and a flange 64 is formed at the other end of the holding portion 63. A pair of connection ports 65 and 66 project from one end of the holding portion 63, the drain hose 45 from the pump 8 is connected to the upstream connection port 65, and the dropping plate is connected to the downstream connection port 66. A drain hose 45 connected to 42 is connected. Thereby, the drain joint 60 constitutes a part of the internal flow path.

  An attachment piece 67 is integrally formed on the side surface of the holding portion 63. The attachment piece 67 is attached to the cabinet 1 with screws or the like, and the drain joint 60 is fixed to the cabinet 1. And the flange 64 is arrange | positioned so that the cabinet 1 may face the exterior. As shown in FIG. 11, a pair of guide grooves 68 are formed in the flange 64 symmetrically across the central axis. The guide groove 68 is formed in an arc shape and guides the rotation of the drain cock 61.

  As shown in FIGS. 8 to 10, the drain cock 61 has a cylindrical valve portion 70, and a through hole 71 is formed therein. One end side of the valve part 70 is fitted into the holding part 63 of the drain joint 60, and is rotatable. The other end side of the valve portion 70 has a smaller diameter than the one end side, and the drain hose 47 is connected or plugged. The drain hose 47 communicates with the internal channel through the through hole 71, and the drain cock 61 constitutes a part of the external channel.

  A flange 72 is formed at an intermediate portion of the valve portion 70, and a knob 73 projects from the outer surface side of the flange 72. A pair of hooks 74 are formed in an L shape on the inner surface side of the flange 72, and the hooks 74 are inserted into and engaged with the guide grooves 68 of the drain joint 60. As a result, the drain cock 61 is rotatably held by the drain joint 60 and is detachable. Further, the rotation angle of the drain cock 61 is restricted by the guide groove 68, and the rotation angle is about 90 degrees.

  On one end side of the valve portion 70 of the drain cock 61, a part of the peripheral wall is cut away to form a cutout portion 75, and the remaining peripheral wall is projected. The peripheral wall slides along the inner peripheral surface of the holding portion 63 of the drain joint 60 and closes the downstream connection port 66.

  That is, the drain cock 61 is rotated between the circulation position and the drainage position. When in the drainage position, the valve portion 70 of the drain cock 61 closes the downstream connection port 66, and the downstream connection port 65 of the drain joint 60 communicates with an external flow path passing through the valve portion 70. When in the circulating position, the connection ports 65 and 66 are not blocked by the valve portion 70, and the connection ports 65 and 66 are communicated through the notch 75 of the valve portion 70.

  Normally, when using an integrated air conditioner, the drain hose 47 is not connected to the drain cock 61 and is plugged instead. Therefore, when the drain cock 61 is switched to the circulation position, the drain water enters the through hole 71 of the valve portion 70 but does not leak to the outside. Then, when performing dehumidifying operation or forcibly draining from the drain pan 43, the stopper is removed and the drain hose 47 is connected. The drain hose 47 may be always connected.

  Here, the switching detector 55 provided for detecting the switching state of the switching device 46 detects the switching position of the drain cock 61 to be rotated. Therefore, a limit switch, an optical switch, or the like is used as the switching detector 55 and is installed in the cabinet 1.

  The strainer 62 is disposed on one end side of the drain cock 61 and is provided so as to cover the opening including the notch 75. The strainer 62 is a synthetic resin net and is insert-molded into the drain cock 61. Therefore, the strainer 62 can be taken out from the cabinet 1 by removing the drain cock 61 from the drain joint 60.

  In the above integrated air conditioner, when the cooling operation is selected, the control device 50 confirms the switching position of the drain cock 60 based on the output of the switching detector 55 and displays the current position on the display 52 or the like. . When the switching position of the drain cock 60 is in the circulation position, the control device 50 drives the compressor 2, the pump 8, and the like so as to start the cooling operation because it corresponds to the cooling operation. It is assumed that the through hole 71 of the drain cock 61 is plugged.

  When the switching position of the drain cock 61 is in the drainage position, the cooling device does not support the cooling operation. Therefore, the control device 50 notifies the user that the switching position is wrong by sound or light, and executes the operation. To regulate. That is, the driving of the compressor 2, the pump 8, etc. is prohibited, and the operation is completely restricted. Alternatively, the compressor 2 and the fans 5 and 6 are driven, but the driving of the pump 8 is prohibited and the operation is partially restricted. Then, when the drain water is accumulated in the drain tray 43 and becomes full, the cooling operation is stopped.

  Similarly, when the dehumidifying operation is selected, the control device 50 confirms the switching position of the drain cock 61. When the switching position of the drain cock 61 is at the drainage position, the dehumidifying operation is started because it corresponds to the dehumidifying operation. At this time, the drain hose 47 is connected to the drain cock 61.

  Since the dehumidifying operation is not supported when the switching position of the drain cock 61 is in the circulation position, the control device 50 notifies the user that the switching position is incorrect by sound, light, etc., and executes the operation. To regulate. That is, the drive of the compressor 2, the pump 8, etc. is prohibited. Alternatively, the compressor 2 and the fans 5 and 6 are driven, but the driving of the pump 8 is prohibited and the drain water is accumulated in the drain tray 43. Then, when the drain pan 43 is full of water, the dehumidifying operation is stopped.

  Similarly, when the drain button 54 is operated, the control device 50 confirms the switching position of the drain cock 61. When the switching position of the drain cock 61 is at the drainage position, the pump 8 is driven and drain water is discharged. When the switching position of the drain cock 61 is in the circulation position, the control device 50 notifies the user that it is in the wrong switching position by sound, light, or the like, and restricts the execution of the operation. That is, the drive of the pump 8 is prohibited.

  Therefore, when the selected operation and the switching position of the drain cock 61 do not correspond to each other, the operation is restricted. Therefore, it is possible to prevent the drain water from flowing into an unintended flow path and hindering the operation. For example, drain water can be prevented from being discharged to the outside of the cabinet 1 even when the drain cock 61 is mistakenly switched during cooling operation and the stopper is forgotten to be closed.

  When the operation starts normally, drain water is generated and collected in the drain pan 43. The drain water accumulated in the drain pan 43 is pumped up by driving the pump 8, and the drain water passes through the switch 46 through the drain hose 45. In the case of cooling operation, it is sent to the dropping tray 42 and applied to the condenser 3. In the case of the dehumidifying operation, the water flows from the drain cock 61 to the drain hose 47 and is drained to the outside. At this time, impurities such as dust accumulated in the drain tray 43 also flow in the drain hose 45 together with the drain water. The drain water passes through the strainer 62, but the impurities are captured by the strainer 62 and accumulate. After the operation, the user pulls out the drain cock 61 from the drain joint 60 and cleans the strainer 62.

  As described above, since the strainer 62 can be easily washed, if it is regularly washed, impurities contained in the drain water can be removed, and when the drain water is circulated using the internal flow path, It is possible to prevent clogging of the flow path and decrease in flow rate due to impurities. Since the drain water from which impurities have been removed can be flowed to the condenser 3, no impurities remain on the surface of the condenser 3 even if the drain water evaporates. Therefore, even if the internal treatment of the drain water is performed for a long time, the heat exchange capability of the condenser 3 can be prevented from decreasing.

  The switch 46 is operated manually, but the flow path may be automatically switched using an electromagnetic valve. The electromagnetic valve is a two-way switching valve, to which an upstream drain hose 45 from the pump 8, a downstream drain hose 45 leading to the dropping tray 42, and a drain hose 47 leading to the outside are connected. When the upstream connection port 65 and the downstream connection port 66 communicate with each other by the solenoid valve, an internal flow path is formed, and when the upstream connection port 65 and the drainage hose 47 communicate with each other, the external flow A path is formed. In addition, when using a solenoid valve, the drainage hose 47 is always connected.

  Then, switching of the electromagnetic valve is controlled by the control device 50. That is, the control device 50 operates the solenoid valve according to the selected operation, switches the flow path from the pump 8 to the internal flow path side during the cooling operation, and when the dehumidifying operation or the drain button 54 is operated, Switch to the external channel side. This eliminates the need for the user to perform an operation of switching the flow path according to the operation, and improves operability as an air conditioner.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. You may apply not only to an integrated air conditioner but to a separation-type air conditioner. Furthermore, you may apply to the electric equipment which water generate | occur | produces by driving | operation, such as a dehumidifier and a refrigerator.

  In the circulation mode for circulating drain water for internal treatment, it is executed by evaporating the drain water with a condenser during cooling operation. In addition to this, the drain water is led to a heating device such as a heater and directly evaporated. Alternatively, the drain water may be sprayed using an ultrasonic vibrator. That is, when the integrated air conditioner also performs the heating operation, the circulation mode is executed during the heating operation.

Whole block diagram of integrated air conditioner of the present invention The figure which shows arrangement | positioning inside the exhaust heat chamber of an air conditioner External perspective view of the air conditioner viewed from the front side External perspective view of the air conditioner viewed from the back side Air conditioner control block diagram Diagram showing switch Cross section of switch Top view of drain cock and drain joint Side view of drain cock and drain joint Front view of drain cock Front view of drain joint

Explanation of symbols

2 Compressor 3 Condenser 4 Evaporator 5 Blower Fan 6 Exhaust Fan 7 Duct 8 Pump 45 Drain Hose 46 Switch 47 Drain Hose 50 Control Device 54 Drain Button 55 Switching Detector 60 Drain Joint 61 Drain Cock 62 Strainer

Claims (2)

A compressor, a condenser and an evaporator are installed in the cabinet, and a water reservoir for storing drain water generated by the refrigeration cycle operation, a drain means for discharging the drain water from the water reservoir, and for treating the drain water in the cabinet. An internal flow path that circulates to the outside, an external flow path that drains drain water to the outside of the cabinet, and a switch that switches the flow path, and a strainer that removes impurities contained in the drain water is provided in the switch. The integrated air conditioner is characterized in that the switch is detachable from the cabinet. The switching device includes a drain joint that is interposed in the internal flow path and forms a part of the internal flow path, and a drain cock that is detachably attached to the drain joint and opens and closes the flow path in the drain joint. The integrated air conditioner according to claim 1, wherein the drain cock protrudes outside the cabinet to constitute a part of an external flow path, and a strainer is attached to the drain cock.

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