KR20210128260A - Laundry drying machine - Google Patents

Abstract

The present invention relates to a laundry drying machine comprising a water supply connector for connecting an internal water supply pipe, a direct water pipe, and a water supply inlet pipe, wherein the water supply connector includes a connector body and a connector check valve coupled to the connector body to prevent backflow of water toward an external water supply part and thus to prevent the backflow of water toward a water supply source, and the check valve is installed only by assembling the connector with a pipe so as to improve the assemblability.

Description

Laundry Dryer {LAUNDRY DRYING MACHINE}

The present invention relates to a laundry dryer, and more particularly, to a laundry dryer that sprays high-temperature steam into a drum through a steam unit.

Recently, a clothes treatment device that performs a drying cycle capable of removing moisture from clothes has appeared. Conventional clothes treatment apparatuses supply hot air to a drum accommodating clothes to dry clothes, thereby greatly shortening the drying time of clothes, and performing sterilization and disinfection of clothes.

On the other hand, there is also a conventional laundry treatment apparatus that supplies steam to the clothes in order to remove wrinkles from the clothes, improve drying efficiency, or perform sterilization.

Korean Patent Registration No. 10-1435823 discloses a clothes treatment apparatus that supplies steam to clothes and then dries them.

A water supply connector for connecting an external water supply source, a water supply container, and a steam generator is disclosed in a conventional laundry treatment apparatus.

However, when negative pressure is simply generated in an external water supply source including water supply or when reverse osmosis pressure is generated by direct water, there is a limit in that water in the water supply tank or water in the steam generator may reverse flow to contaminate water.

The present invention was created to improve the problems of the conventional laundry dryer as described above, and an object of the present invention is to provide a laundry dryer that prevents backflow of water so as not to contaminate an external water supply source.

In order to achieve the above object, a laundry dryer according to the present invention includes: a drum rotatably installed inside a cabinet forming an exterior and accommodating a to-be-dried product; a duct unit provided to re-supply the air discharged from the drum to the drum; a circulation fan providing a flow force to the air moving along the duct; a heat exchange unit provided on the duct unit and including heat exchange with air circulated along the duct unit; a steam unit including a steam generator generating steam and supplying steam into the drum; and a water supply unit for supplying water to the steam unit, including an internal water supply unit and an external water supply unit.

The water supply unit may include: an internal water supply pipe connected to the internal water supply unit to supply water from the internal water supply unit to the steam generator; a direct water pipe connected to the external water supply unit to supply water from the external water supply unit to the steam generator; a water supply inlet pipe connected to the steam generator and through which water from the internal water supply unit or water from the external water supply unit is introduced; a water supply connector connecting the internal water supply pipe, the direct water pipe, and the water supply inlet pipe; and at least one check valve installed in the direct water pipe or the internal water supply pipe to prevent the water of the steam generator from flowing backward.

The check valve unit, a connecting holder for connecting the two pipes; and a check valve inserted and coupled to the connecting holder.

The connecting holder may include: a holder body having both ends in an axial direction formed in a cylindrical shape to be inserted into the tube, respectively; and a guide protrusion formed to protrude from the outer circumferential surface of the holder body to guide the assembly direction and position.

The check valve unit may include: a first direct water check valve installed in the direct water pipe to prevent water from flowing backward toward the external water supply unit; and a second direct water check valve disposed between the first direct water check valve and the water supply connector.

In order to achieve the above object, a laundry dryer according to another embodiment of the present invention includes: a drum rotatably installed inside a cabinet forming an exterior and accommodating an object to be dried; a duct unit provided to re-supply the air discharged from the drum to the drum; a circulation fan providing a flow force to the air moving along the duct; a heat exchange unit provided on the duct unit and including heat exchange with air circulated along the duct unit; a steam unit including a steam generator generating steam and supplying steam into the drum; and a water supply unit for supplying water to the steam unit, including an internal water supply unit and an external water supply unit, wherein the water supply unit is connected to the internal water supply unit to supply water from the internal water supply unit to the steam generator internal water supply pipe; a direct water pipe connected to the external water supply unit to supply water from the external water supply unit to the steam generator; a water supply inlet pipe connected to the steam generator and through which water from the internal water supply unit or water from the external water supply unit is introduced; and a water supply connector connecting the internal water supply pipe, the direct water pipe, and the water supply inlet pipe, wherein the water supply connector includes a connector body having a flow path for communicating the internal water supply pipe, the direct water pipe, and the water supply inlet pipe therein ; and a connector check valve coupled therein to the connector body to prevent water from flowing backward toward the external water supply unit.

The connector body may include: a discharge port coupled to the water supply inlet pipe and discharging water introduced from the internal water supply part or the external water supply part to the water supply inlet pipe; an internal water supply inlet connected to the outlet and coupled to the internal water supply pipe through which water from the internal water supply is introduced; and a direct water inlet connected to the outlet and coupled to the direct water pipe through which the water of the direct water pipe flows.

The connector check valve may be inserted and coupled to the direct water inlet.

The direct water inlet may be formed to have an inner diameter greater than an inner diameter of the discharge port.

The direct water inlet may be formed to have an outer diameter greater than an outer diameter of the outlet.

The direct water inlet may include an assembly guide protrusion protruding from the outer circumferential surface to guide the insertion position of the connector check valve.

The direct water inlet may further include a direction indicating protrusion connected to the axial surface of the guide protrusion and protruding in the shape of a triangular prism to indicate the assembly direction.

The connector check valve may include a valve body formed in a cylindrical shape to be inserted and coupled to the connector body; and a narrow diameter extending from one end of the valve body in the axial direction, disposed inside the connector body to discharge water flowing in from the direct water pipe, and the flow of water flowing in from the internal water supply pipe or the water supply inlet pipe It may include a; valve outlet to block.

The connector check valve may further include a coupling support jaw that is formed to extend radially outwardly from the other end of the valve body in the axial direction and is supported by the connector body.

The connector check valve may further include a coupling protrusion formed to protrude along a circumferential direction on the outer circumferential surface of the valve body and contact with the inner circumferential surface of the connector body.

The water supply unit may further include a direct water check valve installed in the direct water pipe to prevent water from flowing backward toward the external water supply unit.

The water supply unit may further include an internal water supply check valve installed in the internal water supply pipe to prevent water from flowing backward toward the internal water supply unit.

The inner diameter of the valve body may be formed to correspond to the size of the inner diameter of the outlet.

As described above, according to the laundry dryer according to the present invention, a check valve is provided in the connector to prevent backflow of water toward the water supply source.

In addition, since the check valve can be mounted only by inserting the check valve into the connector and assembling the connector with the pipe, there is an effect of improving assembly.

In addition, there is an effect that the check valve can be mounted even by replacing only the connector on the existing pipe.

1 is a view for explaining the external appearance of a laundry dryer according to an embodiment of the present invention.
2 is a cross-sectional view for explaining the internal structure of the laundry dryer according to the embodiment of the present invention.
3 is a view for explaining the piping structure of the water supply unit and the steam unit in the laundry dryer according to an embodiment of the present invention.
4 is a view for explaining a check valve in the laundry dryer according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of FIG. 4 .
6 is a view for explaining the piping structure of the water supply unit and the steam unit in the laundry dryer according to another embodiment of the present invention.
7 is a view for explaining a water supply connector in the laundry dryer according to another embodiment of the present invention.
FIG. 8 is a cross-sectional view of FIG. 7 .
9 is a perspective view illustrating a structure of a connector check valve in a laundry dryer according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be construed to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The above terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The term “and/or” may include a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but other components may exist in between. can be understood On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it may be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression may include the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and one or more other features It may be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary may be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, it is interpreted in an ideal or excessively formal meaning. it may not be

In addition, the following embodiments are provided to more completely explain to those with average knowledge in the art, and the shapes and sizes of elements in the drawings may be exaggerated for clearer description.

1 is a view for explaining the external appearance of the laundry dryer according to the embodiment of the present invention is disclosed, Figure 2 is a cross-sectional view for explaining the internal structure of the laundry dryer according to the embodiment of the present invention is disclosed.

1 and 2 , the cabinet 10 forming the outer body of the laundry dryer 1 includes a front panel 11 constituting the front surface of the laundry dryer 1, and a rear surface constituting the rear surface of the laundry dryer 1 . It includes a panel 12, a pair of side panels 14 constituting a side surface, and an upper panel 13 constituting an upper surface.

The front panel 11 may be provided with an inlet 111 provided to communicate with the drum 20 to be described later, and a door 112 rotatably coupled to the cabinet 10 to open and close the inlet 111 .

The front panel 11 is provided with a control panel 117 .

The control panel 117 includes an input unit 118 for receiving a control command from a user, a display unit 119 for outputting information such as a control command selectable by the user, and a command for controlling the operation of the laundry dryer 1 . A main control unit (not shown) may be installed.

On the other hand, the input unit 118 includes a power supply requesting unit for requesting power supply to the laundry dryer, a course input unit allowing a user to select a desired course from among a plurality of courses, an execution request unit requesting the start of the course selected by the user, and the like. can be configured to include.

The display unit 119 may be configured to include at least one of a display panel capable of outputting characters and/or figures, and a speaker capable of outputting a voice signal and sound. The user can easily grasp the status of the current administration, the remaining time, and the like through the information output through the display unit 119 .

A drum 20 is rotatably provided inside the cabinet 10 and provides a space in which clothes (to be dried) are accommodated, and a flow path for re-supplying air discharged from the drum 20 to the drum 20 is formed. and a heat exchange unit 40 for dehumidifying and heating the air introduced into the duct unit 30 and re-supplying it to the drum 20 .

The drum 20 includes a cylindrical drum body 21 having an open front surface, and a first support part 22 rotatably supporting the front surface of the drum body 21 inside the cabinet 10, and A second support part 23 for rotatably supporting the rear surface of the drum body 21 may be provided.

The first support part 22 is provided to penetrate the first fixed body 22a fixed to the inside of the cabinet 10 and the first fixed body 22a to communicate the inlet 111 and the inside of the drum body 21 . It may be configured to include a drum inlet (22b), a first support body (22c) provided in the first fixed body (22a) is inserted into the front surface of the drum body (21).

The first support 22 may be configured to further include a connection body 22d connecting the inlet 111 and the drum inlet 22b. As shown, the connection body 22d may be provided in the shape of a pipe extending from the drum inlet 22b toward the inlet 111. In addition, the connection body (22d) may be provided with an air outlet (22e) communicating with the duct (30).

As shown in FIG. 2, the air outlet 22e is a passage through which the internal air of the drum body 21 can move to the duct part 30, and is provided as a through hole provided to pass through the connecting body 22d. can

The second support part 23 includes a second fixed body 23a fixed inside the cabinet 10 , and a second support body provided on the second fixed body 23a and inserted into the rear surface of the drum body 21 . (23b) is included.

The second support part 23 is provided with an air inlet 23c which is provided to pass through the second fixed body 23a and communicates the inside of the drum body 21 with the inside of the cabinet 10 .

In this case, the duct portion 30 is configured to connect the air outlet 22e and the air inlet 23c.

The cylindrical drum body 21 may rotate through various types of driving units 50 .

For example, in FIG. 2 , a drum motor 51 in which the driving unit 50 is fixed inside the cabinet 10 , a pulley 52 rotated by the drum motor 51 , a circumferential surface of the pulley 52 and the drum body An embodiment comprising a belt 53 connecting the circumferential surfaces of 21 is shown.

In this case, a first roller R1 for rotatably supporting the circumferential surface of the drum body 21 is provided on the first support part 22 , and the circumferential surface of the drum body 21 is provided on the second support part 23 . A second roller R2 that rotatably supports may be provided.

However, the present invention is not limited thereto, and the drum motor 51 is directly connected to the drum and rotates the drum without going through a pulley and a belt, and a direct drive type driving unit is also applicable, which naturally falls within the scope of the present invention. . For convenience, the following description will be based on the illustrated embodiment of the driving unit 50 .

The duct part 30 connects the exhaust duct 31 connected to the air outlet 22e, the supply duct 32 connected to the air inlet 23c, the exhaust duct 31, and the supply duct 32, and has an inside It includes a connection duct 33 in which the heat exchange unit 40 is installed.

The heat exchange unit 40 may be provided with various devices capable of sequentially dehumidifying and heating the air introduced into the duct unit 30 . For example, the heat exchange unit 40 may be provided as a heat pump system.

As a heat pump system method, the heat exchange unit 40 includes a circulation fan 43 that moves air along the duct unit 30 and a first that performs a dehumidification function by lowering the humidity of the air introduced into the duct unit 30 . It may include a heat exchanger (heat absorbing part, 41) and a second heat exchanger (heating part, 42) provided inside the duct part 30 to heat the air that has passed through the first heat exchanger (41).

The circulation fan 43 is provided to include an impeller 43a provided in the duct part 30 and an impeller motor 43b for rotating the impeller 43a, and the air moving along the duct part 30 provide fluidity to

The impeller 43a may be installed at any position among the exhaust duct 31 , the connection duct 33 , and the supply duct 32 , and in FIG. 2 , the impeller 43a is provided in the connection duct 32 . An example is shown, and the present invention is not limited thereto, but for convenience, the following description will be made based on an embodiment in which the impeller 43a is provided in the connection duct 32 .

The heat exchange unit 40 may exchange heat with air circulated along the duct unit 30 .

The heat absorbing part 41 and the heat generating part 42 are sequentially arranged in the direction from the exhaust duct 31 to the supply duct 32 as the inside of the connection duct 33, and a refrigerant pipe forming a circulation path of the refrigerant. (44) is connected to each other.

The heat absorbing part 41 is a means for cooling the air and evaporating the refrigerant by transferring the heat of the air introduced into the exhaust duct 31 to the refrigerant.

The heat generating unit 42 is a means for heating the air and condensing the refrigerant by transferring the heat of the refrigerant that has passed through the compressor 45 to the air.

The compressor 45 receives rotational force by the compressor motor 45a and compresses the refrigerant exchanged with the air circulated along the duct part 30 .

In this case, the moisture contained in the air moves along the surface of the heat absorbing part 41 when passing through the heat absorbing part 41 and is collected on the bottom surface of the connection duct 33 .

As described above, the configuration of the heat pump system type heat exchanger 40 including the heat absorbing part 41 and the heat generating part 42 is applicable to configurations already known in the art. A description thereof will be omitted.

On the other hand, in order to collect the condensed water condensed from the air passing through the heat absorbing unit 41 and collected on the bottom surface of the connection duct 33, the laundry dryer 1 according to the present invention is provided with a water collecting unit 60 .

The condensed water condensed in the heat absorbing unit 41 may be first collected in the water collecting unit 60 , and then may be secondarily collected in the water storing unit 70 . The water collecting part 60 may be located inside the connection duct 33 as shown, or may be provided separately in a space spaced apart from the connection duct 33 .

The condensed water first collected through the water collecting unit 60 is supplied to the water storage unit 70 through the condensed water supply pipe 61 . At this time, the condensed water supply pipe 61 is provided with a condensed water pump 62 for smooth discharge of the condensed water.

The water storage unit 70 includes a water storage tank 72 that is provided to be withdrawn from one side of the front panel 11 to the outside. The water storage tank 72 is configured to collect the condensed water transferred from the water collecting unit 60 to be described later.

The user may remove the condensed water by withdrawing the water storage tank 72 from the cabinet 10 , and then re-install it in the cabinet 10 . Accordingly, the laundry dryer according to the present invention may be disposed at any place where a sewer or the like is not installed.

In more detail, the water storage unit 70 is provided so as to penetrate through the water storage tank 72 that is detachably provided in the cabinet 10 to provide a space in which water is stored, and the water storage tank 72, so that the condensed water supply pipe 61 is provided. It may be provided to include an inlet (72a) for introducing the water discharged from the water storage tank (72).

The water storage tank 72 may be provided as a drawer-type tank drawn out from the cabinet 10 . In this case, the front panel 11 of the cabinet is provided with a water storage unit mounting hole into which the water storage tank 72 is inserted.

A panel 71 is fixed to the front surface of the water storage tank 72 , and the panel 71 may be provided to be detachably coupled to the water storage unit mounting hole to form a part of the front panel 11 .

The panel 71 may further include a groove portion 71a into which a user's hand is inserted and gripped. In this case, the panel 71 also functions as a handle for withdrawing the water storage tank 72 from the cabinet or inserting it into the cabinet.

The inlet 72a is formed to receive the condensed water discharged from the condensate nozzle 63 fixed to the cabinet 10 . The condensate nozzle 63 may be fixed to the upper panel 13 of the cabinet 10 so that the water storage tank 72 is positioned above the inlet 72a when it is inserted into the cabinet 10 .

The user can discard the water inside the water storage tank 72 by withdrawing the water storage tank 72 from the cabinet 10 and then turning or tilting the water storage tank 72 toward the direction in which the inlet 72a is located. A communication hole 72b provided to penetrate the upper surface of the water storage tank 72 may be further provided so that the water inside the water storage tank 72 is easily discharged through the inlet 72a.

In addition, the laundry dryer 1 according to the present invention includes a first filter unit F1 and a second filter unit F2 as a means for removing foreign substances such as lint and dust generated during the drying process of laundry such as clothes. be prepared

The first filtering unit F1 is provided in the exhaust duct 31 to primarily filter foreign substances contained in the air discharged from the drum 20 .

The second filtering unit F2 is disposed downstream of the first filtering unit F1 in the flow direction of the air so as to secondarily filter foreign substances contained in the air that has passed through the first filtering unit F1. As shown in more detail, it is preferable that the second filtering unit F2 be disposed on the upstream side of the first heat exchanger 41 as the inside of the connection duct 33 . This is to prevent foreign substances contained in the air from accumulating in the first heat exchanger 41 acting as a heat absorbing part to contaminate the first heat exchanger 41 or to cause deterioration in performance.

As for the detailed configuration of the first filtering unit F1 and the second filtering unit F2, any means known in the art may be applied, and a description of the detailed configuration will be omitted.

On the other hand, the laundry dryer 1 according to the present invention is a water supply unit 80 including an internal water supply unit 81 and an external water supply unit 82, and receives water from the water supply unit 80 to generate steam. It further includes a steam unit (90).

The steam unit 90 may be provided to generate steam by receiving fresh water instead of condensed water. The steam unit 90 may include a steam generator 91 , a steam pipe 92 , a steam nozzle 93 , and an accumulator 94 .

The steam generator 91 may receive water from the water supply unit 80 and heat the supplied water to generate steam. A piping structure through which water flows into the steam generator 91 and steam is discharged will be described later.

Meanwhile, in the present embodiment, the steam generator 91 heats a certain amount of water contained therein with a heater (not shown) to generate steam (hereinafter referred to as 'tong heating method' for convenience), but limited to this. it's not going to be

Steam generated by the steam generator 91 may be introduced into the steam nozzle 93 , and the steam may be sprayed into the drum 20 .

The steam pipe 92 connects the steam generator 91 and the steam nozzle 93, and a flow path through which steam can flow is formed therein. Accordingly, the steam generated by the steam generator 91 may flow along the steam pipe 92 and be discharged into the drum 20 through the steam nozzle 93 .

The accumulator 94 is installed on the steam pipe 92 to separate the condensed water from steam when the steam generated from the steam generator 91 is condensed in the steam pipe 92 to become condensed water. . At this time, the condensed condensed water may flow back into the steam generator 91 or into the water collecting unit 60 .

The steam unit 90 may be controlled to supply steam to the inside of the drum body 21 by receiving water through the external water supply unit 82 as well as the internal water supply unit 81 as needed.

The external water supply unit 82 includes a direct water valve 82a adjacent to or fixed to the rear panel 13 and a direct water pipe supplying water delivered from the direct water valve 82a to the steam unit 90 . (84) may be included.

The direct water valve 82a may be provided to be coupled to an external water supply source. For example, the direct water valve 82a may be coupled to a water supply pipe (not shown) extending to the rear surface of the cabinet. Accordingly, the steam unit 90 may be provided to receive water directly through the direct water valve 82a.

Therefore, even if the internal water supply unit 81 is omitted or water is not stored in the internal water supply unit 81, the steam unit 90 receives water for steam generation through the direct water valve 82a when necessary. can

The direct water valve 82a may be directly controlled by the control unit 100 .

The control unit 100 may be installed on the control panel 117 , but may be provided as a separate control panel to prevent overload of the control panel 117 and increase manufacturing cost as shown in FIG. 1 .

In this case, the control unit 100 may be provided adjacent to the steam unit 90 . The control unit 100 is provided on the side panel 14 on which the steam unit 90 is installed to reduce the length of a control line connected to the steam unit 90 .

On the other hand, the steam unit 90 is preferably installed adjacent to the direct water valve (82a). Accordingly, it is possible to prevent unnecessary residual water from remaining in the direct water pipe 82b, and water can be supplied immediately when necessary.

On the other hand, the internal water supply unit 81 includes a storage tank 810 for storing water, a supply pump 820 that receives water from the storage tank 810 and delivers water to the steam unit 90 , and a storage tank ( 810) and a tank housing 830 providing a space for accommodating the supply pump 820, and an internal water supply pipe 83 that connects the supply pump 820 and the steam unit 90 and has a flow path through which water can flow. ) is included.

Accordingly, the internal water supply unit 81 is configured to supply stored water to the steam unit. That is, the water stored in the storage tank 810 may be supplied to the steam unit 90 along the internal water supply pipe 83 by the operation of the supply pump 820 .

Meanwhile, FIG. 3 is a view for explaining a piping structure of a water supply unit and a steam unit in the laundry dryer according to an embodiment of the present invention, and FIG. 4 shows a check valve in the laundry dryer according to an embodiment of the present invention. A drawing for explanation is disclosed, and FIG. 5 is a cross-sectional view of FIG. 4 is disclosed.

The piping structure of the water supply part and the steam part of the laundry dryer according to an embodiment of the present invention will be described with reference to FIGS. 2 to 5 .

The water supply unit 80 of the present invention may include an internal water supply pipe 83 , a direct water pipe 84 , a water supply inlet pipe 85 , a water supply connector 86 , and a check valve unit 87 .

Specifically, the water supply part 80 includes an internal water supply pipe 83 connected to the internal water supply part 81 in order to supply the water of the internal water supply part 81 to the steam generator 91, and an external water supply part 82. It may include a direct water pipe 84 connected to the external water supply unit 82 to supply water to the steam generator 91 . In addition, the internal water supply pipe 83 and the direct water pipe 84 are connected to the water supply connector 86 so that the water of the internal water supply part 81 or the water of the external water supply part 82 flows into the water supply connector 86. have. In addition, the water supply connector 86 and the steam generator 91 are connected to the water supply inlet pipe 85 so that the water of the internal water supply part 81 or the water of the external water supply part 82 can be supplied to the steam generator 91 . have.

The internal water supply pipe 83 may mean a pipe in which a flow path through which water can flow is formed, an internal water supply part 81 is connected to one end, and a water supply connector 86 is connected to the other end.

For example, the internal water supply pipe 83 may include a first internal water supply pipe 83a and a second internal water supply pipe 83b. At this time, one end of the first internal water supply pipe 83a may be connected to the internal water supply unit 81 , and the other end may be connected to the check valve unit 87 . In addition, one end of the second internal water supply pipe 83b may be connected to the check valve unit 87 , and the other end may be connected to the water supply connector 86 . Accordingly, the check valve unit 87 may be disposed between the first internal water supply pipe 83a and the second internal water supply pipe 83b.

The check valve unit 87 will be described later with reference to FIGS. 4 and 5 .

The direct water pipe 84 may mean a pipe in which a flow path through which water can flow is formed, an external water supply part 82 may be connected to one end thereof, and a water supply connector 86 may be connected to the other end thereof.

For example, the direct water pipe 84 may include a first direct water pipe 84a, a second direct water pipe 84b, and a third direct water pipe 84c. In this case, one end of the first direct water pipe 84a may be connected to the external water supply unit 82 , and the other end may be connected to the check valve unit 87 . In addition, both ends of the second direct water pipe 84b may be respectively connected to the check valve unit 87 . In addition, one end of the third direct water pipe 84c may be connected to the check valve unit 87 , and the other end may be connected to the water supply connector 86 . Therefore, a check valve unit 87 may be disposed between the first direct water pipe 84a and the second direct water pipe 84b and between the second direct water pipe 84b and the third direct water pipe 84c, respectively. .

The water supply unit 80 is connected to the steam generator 91 and may include a water supply inlet pipe 85 through which water from the internal water supply unit 81 or water from the external water supply unit 82 flows.

The water inlet pipe 85 may mean a pipe in which a flow path through which water can flow is formed, a water supply connector 86 may be connected to one end thereof, and a steam generator 91 may be connected to the other end thereof.

The water supply connector 86 may connect the internal water supply pipe 83 with the direct water pipe 84 and the water supply inlet pipe 85 . In detail, the water supply connector 86 may be in the form of a pipe open in three directions. For example, the water supply connector 86 may be a T-shaped connector.

The check valve unit 87 may refer to a structure that serves to prevent a reverse flow of a fluid. In detail, the check valve unit 87 is disposed on the flow path, and when the fluid flows in the intended direction (hereinafter may be referred to as a 'forward direction') at the time of design, it does not block the flow, but does not block the flow in the intended direction. When the fluid flows backward in the opposite direction (hereinafter may be referred to as 'reverse direction'), it may be configured to block the flow.

In a laundry dryer of a type that injects high-temperature steam into the drum, water is supplied into the steam generator by using an internal water supply unit or an external water supply unit.

On the other hand, in the case of an external water supply unit connected to a water supply and receiving clean water, there is a possibility that negative pressure may occur depending on conditions, and even in the case of an internal water supply unit to which water is supplied by the operation of the supply pump 820, depending on the operating conditions of the pump. There is a possibility that negative pressure may occur.

Also, in this case, reverse osmosis for direct water or reverse osmosis for stored water may occur.

On the other hand, when the water stored in the internal water supply unit or the steam generator is stagnant for a long time, contamination may occur such as bacteria breeding in the water. If contaminated water flows back due to reverse osmosis or pressure difference, it may contaminate tap water or contaminate a tank in which clear water is stored.

Therefore, it is necessary to prevent the water contaminated inside the internal water supply unit or the steam generator from flowing back into the external water supply unit.

In order to solve this problem, in the laundry dryer 1 according to the embodiment of the present invention, the check valve part 87 is installed in the direct water pipe 84 or the internal water supply pipe 83 so that the steam generator 91 or the internal water supply part 81 is installed. ) to prevent backflow of water.

For example, the check valve unit 87 includes a first direct water check valve 87a and a first direct water check valve 87a installed in the direct water pipe 84 to prevent water from flowing backward toward the external water supply unit 82 . and a second direct water check valve 87b disposed between the water supply connector 86 and the water supply connector 86 .

In addition, the check valve part 87 may be installed in the internal water supply pipe 83 to prevent water from flowing backward toward the internal water supply part 82 .

Specifically, a first direct water check valve 87a may be disposed between the first direct water pipe 84a and the second direct water pipe 84b, and the second direct water pipe 84b and the third direct water pipe 84c. A second direct water check valve 87b may be disposed between the .

In addition, an internal water supply check valve 87c may be disposed between the first internal water supply pipe 83a and the second internal water supply pipe 83b.

By such a configuration, it is possible to prevent the reverse flow of water from the internal water supply unit 81 and the external water supply unit 82 .

In particular, in the case of the direct water pipe 84 that needs to block the reverse flow in order to prevent water pollution, a double check valve part 87 is provided so that even if any one of the check valve parts 87 is damaged, the reverse flow has the effect of blocking

This has an effect of stably protecting the external water supply unit 82 from reverse flow, compared to installing the check valve unit 87 on the water supply inlet pipe 85 .

For example, it may be assumed that one check valve unit 87 is mounted on the internal water supply pipe 83 , the direct water pipe 84 , and the water inlet pipe 85 , respectively. In this case, water flowing backward from the steam generator 91 is blocked by the two check valve parts 87 while flowing to the external water supply part 82 .

But. Water flowing backward from the internal water supply part 81 to the external water supply part 82 through the internal water supply pipe 83 and the water supply connector 86 is in one check valve part 87 disposed in the direct water pipe 84. Backflow is blocked only by That is, when water flows backward from the internal water supply part 81 to the external water supply part 82, the check valve part 87 disposed in the internal water supply pipe 83 is installed in the forward direction, so it serves to block the reverse flow. There is a limit in that only the check valve part 87 disposed in the direct water pipe 84 can function to prevent backflow.

In order to solve this problem, in the present invention, by installing two check valve parts 87 on the direct water pipe 84, it is possible to double block all of the reverse flow that may occur in the internal water supply part 81 or the steam generator 91. there is an effect

Meanwhile, referring to FIGS. 4 and 5 , the detailed configuration of the check valve unit 87 is as follows.

The check valve unit 87 of the present invention may include a connecting holder 871 and a check valve 872 .

Specifically, the check valve unit 87 may include a connecting holder 871 connecting the two pipes and a check valve 872 inserted and coupled to the connecting holder 871 to block the reverse flow of the fluid.

The connecting holder 871 may include a holder body 871a and a guide protrusion 871b. In detail, the connecting holder 871 may include a holder body 871a and a guide protrusion 871b protruding from the outer circumferential surface of the holder body 871a in the circumferential direction.

For example, the holder body 871a may be formed in a cylindrical shape so that a fluid can flow therein, and both ends in the axial direction may be formed to be inserted into the tube, respectively. At this time, the pipe may be an internal water supply pipe 83 , a direct water pipe 84 , or a water inlet pipe 85 .

On the other hand, a discharge port 871d is formed at the end of the holder body 871a in the direction in which the fluid is discharged (positive direction). At this time, the discharge port 871d may be formed as the inner diameter of the holder body 871a gradually decreases.

The guide protrusion 871b is formed to protrude from the outer circumferential surface of the holder body 871a to guide the assembly direction and position.

For example, the guide protrusion 871b may be formed to protrude in an annular shape along the outer circumferential surface of the holder body 871a.

In addition, the connecting holder 871 is connected to the axial surface of the guide protrusion 871b and is formed to protrude in the form of a triangular prism from the outer circumferential surface of the holder body 871a and further includes a direction indicating protrusion 871c to indicate the assembly direction. can do.

Therefore, when assembling the connecting holder 871 to the pipe, the operator can recognize the triangle (or arrow) direction indicated on the direction indication protrusion 871c, and consider the intended flow of the fluid when designing the check valve 872 After inserting into the connecting holder 871, the connecting holder 871 can be assembled to the tube. That is, it is possible to prevent erroneous assembly through the guide protrusion 871b and the direction indication protrusion 871c of the present invention.

The check valve 872 may include a valve body 872a, a valve outlet 872b, a coupling support jaw 872c, and a coupling protrusion 872d.

Specifically, the check valve 872 includes a valve body 872a inserted into the connecting holder 871, and at one end of the axial direction of the valve body 872a, a valve outlet 872b for discharging the fluid flowing in the forward direction is provided. A coupling support jaw 872c that is caught and supported by the end of the connecting holder 871 is formed at the other end of the valve body 872a in the axial direction, and the outer circumferential surface of the valve body 872a has an inner circumferential surface of the connecting holder 871 A coupling protrusion (872d) supported in contact with the is formed to protrude.

For example, the valve body 872a may be formed in a cylindrical shape to be inserted and coupled to the holder body 871a.

Meanwhile, the inner diameter of the valve body 872a may be formed to correspond to the size of the inner diameter of the outlet 871c of the connecting holder 871 . For example, the inner diameter of the valve body 872a may be the same as the inner diameter of the outlet 871c of the connecting holder 871 .

With such a structure, in the present invention, the amount of fluid flowing into the valve body 872a and the amount of fluid discharged through the outlet 871c can be uniformly maintained, and pulsation caused by the inflow of the fluid is prevented. has the effect of

The valve outlet 872b may be formed to extend with a narrower diameter at one end of the valve body 872a in the axial direction. In this case, the valve outlet 872b may include various shapes in which the flow path area through which the fluid is discharged is reduced.

For example, the valve outlet 872b may be formed so that one end of the cylindrical valve body 872a in the axial direction is gradually narrowed in a conical shape.

As another example, the valve outlet 872b may be formed such that one end of the valve body 872a in the axial direction is symmetrically narrowed and opened in a rectangular shape. That is, one end of the valve body 872a in the axial direction may be formed to extend while forming inclined surfaces so as to approach each other, and the extended inclined surfaces may be gathered to form a rectangular hole.

With this configuration, the valve outlet 872b of the present invention may be disposed inside the holder body 871a to discharge water flowing in the forward direction, and block the flow of water flowing backward in the reverse direction.

The coupling support jaw 872c may be formed to extend radially outwardly from the other end of the valve body 872a in the axial direction, and may be supported in contact with the holder body 871 . For example, the coupling support jaw 872c is formed to protrude outward in the radial direction from the other end of the valve body 872a in the axial direction, and may be formed to protrude in the form of a hook along the circumferential direction.

With this configuration, the coupling support jaw 872c of the present invention may be contact-supported by being caught by the end of the holder body 871a in the direction in which the fluid flows (the end in the opposite direction to the outlet 871c). Accordingly, the check valve 872 can be supported even when the pressure into which the fluid is introduced is large.

The coupling protrusion 872d may protrude from the outer circumferential surface of the valve body 872a along the circumferential direction, and may come into contact with the inner circumferential surface of the holder body 871a.

For example, the coupling protrusion 872d may be formed to protrude in the form of two ribs along the circumferential direction from the outer circumferential surface of the valve body 872a.

With this configuration, the coupling protrusion 872d of the present invention can be supported in contact with the inner circumferential surface of the holder body 871a, and the check valve 872 can be prevented from being separated from the connecting holder 871 by the pressure of the fluid. have.

On the other hand, since the check valve 872 of this embodiment has the same structure as the connector check valve 862 to be described later, it can be understood using the structure of the connector check valve 862 shown in FIG. 9 .

Meanwhile, FIG. 6 is a view for explaining a piping structure of a water supply unit and a steam unit in a laundry dryer according to another embodiment of the present invention, and FIG. 7 is a water supply connector in the laundry dryer according to another embodiment of the present invention. A drawing for explaining is disclosed, FIG. 8 is a cross-sectional view of FIG. 7 is disclosed, and FIG. 9 is a perspective view for explaining the structure of a connector check valve is disclosed.

In order to avoid overlapping expressions, in this embodiment, the same content as in the embodiment of the present invention will be omitted, and a configuration with a difference will be mainly described in detail.

First, in the piping structure of the water supply part and the steam part according to an embodiment of the present invention, two check valve parts 87 are installed in the direct water pipe 84 so that the water from the internal water supply part 81 or the steam generator 91 is discharged. Backflow to the external water supply unit 82 can be prevented.

Meanwhile, as shown in FIG. 3 , an accumulator 94 may be mounted to prevent condensed water from accumulating in the drum when steam is generated. In this case, the accumulator 94 is coupled to the upper frame 24 disposed on the upper side of the drum 20 , and a part of the accumulator 24 holds the outer circumferential surface of the direct water pipe 84 to support the direct water pipe 84 . are placed

At this time, in order to arrange the two check valve parts 87 in the direct water pipe 84, the direct water pipe 84 is divided into the first direct water pipe 84a, the second direct water pipe 84b and the third direct water pipe 84c. Divide, assemble the first direct water check valve 87a between the first direct water pipe 84a and the second direct water pipe 84b, and between the second direct water pipe 84b and the third direct water pipe 84c. The direct water check valve (87b) must be assembled.

In the case of assembling and connecting a plurality of parts in such a narrow space, the assembly of the direct water pipe 84 and the check valve part 87 is incomplete, so there is a possibility that water may leak, and the installation of the accumulator 94 is incomplete, so condensed water may flow into the drum 20 .

In order to solve this problem, another embodiment of the present invention proposes a structure for preventing water from flowing backward to the external water supply unit 82 while improving assembly and improving space efficiency.

The water supply connector 86 ′ according to another embodiment of the present invention will be described with reference to FIGS. 2 and 6 to 8 .

In this embodiment, the water supply connector 86 ′ connects the internal water supply pipe 83 , the direct water pipe 84 , and the water supply inlet pipe 85 , and can prevent water from flowing backward toward the external water supply unit 81 . .

The water supply connector 86 ′ includes a connector body 861 and a connector check valve 862 .

The connector body 861 has a structure in which a flow path for communicating the internal water supply pipe 83 with the direct water pipe 84 and the water inlet pipe 85 is formed therein.

Specifically, the connector body 861 may be in the form of a pipe open in three directions including an outlet 861a, an internal water inlet 861b, and a direct water inlet 861c.

For example, the connector body 861 may be a T-shaped connector in which the outlet 861a and the direct water inlet 861c are linearly connected coaxially to each other, and the internal water inlet 861b is vertically connected to the outlet 861a. have.

More specifically, the discharge port 861a may be coupled to the water supply inlet pipe 85 , and discharge water introduced from the internal water supply part 81 or the external water supply part 82 to the water supply inlet pipe 85 .

For example, the discharge port 861a may be formed in a cylindrical shape to form a flow path through which water for steam generation is introduced therein, and a protrusion 861aa for guiding the coupling with the water supply inlet pipe 85 on the outer circumferential surface is circumferential. It may be formed to protrude along the direction.

The internal water inlet 861b may be connected to the discharge port 861a and may be coupled to the internal water supply pipe 83 to provide a flow path through which the water discharged from the internal water supply unit 81 flows.

As an example, the internal water inlet 861b is formed in a cylindrical shape so that a flow path through which the water discharged from the internal water supply unit 81 is introduced can be formed therein, and to guide the coupling with the internal water supply pipe 83 on the outer circumferential surface. The protrusion 861ba may be formed to protrude along the circumferential direction. In addition, a steam pipe seating surface 861bb guiding a position in which the steam pipe 92 is disposed may be formed on the outer circumferential surface of the internal water inlet 861b.

In addition, the size of the inner diameter (Φ2) of the internal water inlet (861b) may be the same as the size of the inner diameter (Φ1) of the discharge port (861a). With this configuration, the water introduced into the internal water supply inlet 861b may be stably discharged to the water supply inlet pipe 85 without changes in water pressure and flow rate.

The direct water inlet 861c may be connected to the discharge port 861a and may be coupled to the direct water pipe 84 to provide a flow path through which the water of the direct water pipe 82b flows.

For example, the direct water inlet 861c is formed in a cylindrical shape to form a flow path through which the water discharged from the external water supply unit 82 flows therein, and a guide for guiding the coupling with the direct water pipe 84 on the outer peripheral surface. The protrusion 861ca may be formed to protrude along the circumferential direction.

In addition, the direct water inlet 861c is connected to the axial surface of the guide protrusion 861ca and is formed to protrude from the outer circumferential surface of the direct water inlet 861c in the form of a triangular prism to indicate the assembly direction. can By this configuration, when assembling the water supply connector 86 ′, the operator can recognize the triangle (or arrow) direction indicated on the direction indication protrusion 861cb, which will be described later in consideration of the intended flow of fluid during design. After the connector check valve 862 is inserted into the connector body 861 , the water supply connector 86 ′ may be assembled to the pipe. Therefore, in the present invention, there is an effect of preventing erroneous assembly by the direction indicating protrusion 861cb.

On the other hand, the inner diameter (Φ3) of the direct water inlet (861c) may be formed to be larger (Φ3 > Φ1) than the inner diameter (Φ1) of the discharge port (861a). Also, the outer diameter of the direct water inlet 861c may be larger than the outer diameter of the outlet 861a. Therefore, according to the present invention, there is an effect that the connector check valve 862 can be easily inserted.

The connector check valve 862 may be coupled to the inside of the connector body 861 to prevent water from flowing backward toward the external water supply. Specifically, the connector check valve 862 may be inserted and coupled to the inside of the direct water inlet 861c.

The connector check valve 862 may include a valve body 862a, a valve outlet 862b, a coupling support jaw 862c, and a coupling protrusion 862d.

Specifically, the connector check valve 862 includes a valve body 862a inserted into the connector body 861, and at one end of the axial direction of the valve body 862a, a valve outlet 862b for discharging the fluid flowing in the forward direction. is formed, and at the other end of the valve body 862a in the axial direction, a coupling support jaw 862c caught and supported by the end of the connector body 861 is formed, and on the outer circumferential surface of the valve body 862a, the connector body 861 of A coupling protrusion 862d that is supported in contact with the inner circumferential surface is formed to protrude.

For example, the valve body 862a may be formed in a cylindrical shape to be inserted and coupled to the direct water inlet 861c.

Meanwhile, the inner diameter Φ4 of the valve body 862a may be formed to correspond to the size of the inner diameter Φ1 of the discharge port 861a. For example, the inner diameter Φ4 of the valve body 862a may be formed to be the same as the size of the inner diameter Φ1 of the outlet 861a.

With such a structure, in the present invention, the amount of fluid flowing into the valve body 862a and the amount of fluid discharged through the outlet 861a can be uniformly maintained, and pulsation caused by the inflow of the fluid is prevented. has the effect of

The valve outlet 862b may be formed to extend with a narrower diameter at one end of the valve body 862a in the axial direction. In this case, the valve outlet 862b may include various shapes in which the cross-sectional area of the flow path is reduced.

For example, the valve outlet 862b may be formed so that one end of the cylindrical valve body 862a in the axial direction is gradually narrowed in a conical shape.

As another example, the valve outlet 862b may be formed such that one end of the valve body 862a in the axial direction is symmetrically narrowed and opened in a rectangular shape. That is, one end of the valve body 862a in the axial direction may be formed to extend while forming inclined surfaces so as to approach each other, and the extended inclined surfaces may be gathered to form a rectangular hole.

With this configuration, the valve outlet 862b of the present invention is disposed inside the direct water inlet 861c to discharge water flowing in the forward direction, and block the flow of water flowing backward in the reverse direction.

The coupling support jaw 862c may extend radially outwardly from the other end of the valve body 862a in the axial direction, and may be supported in contact with the connector body 861 . For example, the coupling support jaw 862c is formed to protrude outward in the radial direction from the other end of the valve body 862a in the axial direction, and may be formed to protrude in the form of a hook along the circumferential direction.

With this configuration, the coupling support jaw 862c of the present invention may be contact-supported by being caught by the end of the direct water inlet 861c in the direction in which the fluid flows (the end in the opposite direction to the outlet 861a). Accordingly, the connector check valve 862 can be supported even when the pressure through which the fluid flows is large.

The coupling protrusion 862d is formed to protrude along the circumferential direction from the outer circumferential surface of the valve body 862a, and may be in contact with the inner circumferential surface of the direct water inlet 861c.

For example, the coupling protrusion 862d may be formed to protrude in the form of two ribs along the circumferential direction from the outer circumferential surface of the valve body 862a.

With this configuration, the coupling protrusion 862d of the present invention can be supported in contact with the inner circumferential surface of the direct water inlet 861c, and the connector check valve 862 is prevented from being separated from the connector body 861 by the pressure of the fluid. can

Therefore, according to the water supply connector 86 ′ of the present embodiment, it is possible to maintain a sufficient anti-backflow effect only by arranging only one check valve unit 87 in the direct water pipe 84 . For example, in this embodiment, the direct water pipe 84 may be composed of a first direct water pipe 84a and a second direct water pipe 84b, and between the first direct water pipe 84a and the second direct water pipe 84b. Only one direct water check valve 87a may be disposed.

By such a configuration, it is possible to reduce the number of parts that need to be assembled and connected in a narrow space on the upper side of the drum 20 , and it is possible to prevent water leakage or condensed water from flowing into the drum 20 due to incomplete assembly.

In addition, it is possible to improve the assembling property and improve the space efficiency to improve the production and repair efficiency.

In addition, there is an effect that the check valve can be mounted even by replacing only the connector on the existing pipe.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto. It is clear that the transformation or improvement is possible by the person.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Laundry dryer
20: drum
30: duct part
40: heat exchange unit
43: circulation fan
80: water supply
81: internal water supply
82: external water supply
83: internal water supply pipe
84: straight water pipe
85: water inlet pipe
86, 86` : water supply connector
87: check valve unit
90: steam unit
91: steam generator
861: connector body
862: connector check valve
871: connecting holder
872: check valve

Claims (16)

a drum rotatably installed inside the cabinet forming the exterior to accommodate the object to be dried;
a duct unit provided to re-supply the air discharged from the drum to the drum;
a circulation fan providing a flow force to the air moving along the duct;
a heat exchange unit provided on the duct unit and including heat exchange with air circulated along the duct unit;
a steam unit including a steam generator generating steam and supplying steam into the drum; and
a water supply unit for supplying water to the steam unit, including an internal water supply unit and an external water supply unit;
including,
The water supply unit,
an internal water supply pipe connected to the internal water supply part to supply water from the internal water supply part to the steam generator;
a direct water pipe connected to the external water supply unit to supply water from the external water supply unit to the steam generator;
a water supply inlet pipe connected to the steam generator and through which water from the internal water supply unit or water from the external water supply unit is introduced; and
a water supply connector connecting the internal water supply pipe, the direct water pipe, and the water supply inlet pipe;
includes,
The water supply connector is
a connector body having a flow path formed therein for communicating the internal water supply pipe, the direct water pipe, and the water inlet pipe; and
a connector check valve coupled to the inside of the connector body to prevent backflow of water toward the external water supply;
Laundry dryer comprising a.
According to claim 1,
The connector body is
a discharge port coupled to the water inlet pipe and discharging the water introduced from the internal water supply part or the external water supply part to the water supply inlet pipe;
an internal water supply inlet connected to the outlet and coupled to the internal water supply pipe through which water from the internal water supply is introduced; and
a direct water inlet connected to the outlet and coupled to the direct water pipe through which water from the direct water pipe is introduced;
including,
The connector check valve is
Laundry dryer, characterized in that it is inserted and coupled to the direct water inlet.
3. The method of claim 2,
The direct water inlet,
Laundry dryer, characterized in that formed to have a larger inner diameter than the inner diameter of the discharge port.
3. The method of claim 2,
The direct water inlet,
Laundry dryer, characterized in that formed to have a larger outer diameter than the outer diameter of the discharge port.
3. The method of claim 2,
The direct water inlet,
a guide protrusion protruding from the outer circumferential surface to guide the insertion position of the connector check valve;
Laundry dryer comprising a.
6. The method of claim 5,
The direct water inlet,
a direction indicating protrusion connected to the axial surface of the guide protrusion and formed to protrude in the shape of a triangular prism to indicate an assembly direction;
Laundry dryer further comprising.
3. The method of claim 2,
The connector check valve is
a valve body formed in a cylindrical shape to be inserted and coupled to the direct water inlet of the connector body; and
One end of the valve body in the axial direction is formed to extend and narrow in diameter, and disposed inside the connector body to discharge water flowing in from the direct water pipe, and block the flow of water flowing in from the internal water supply pipe or the water inlet pipe letting valve outlet;
Laundry dryer comprising a.
8. The method of claim 7,
The connector check valve is
a coupling support jaw extending radially outward from the other end of the valve body in the axial direction and supported by the connector body;
Laundry dryer further comprising a.
8. The method of claim 7,
The connector check valve is
a coupling protrusion formed to protrude along the circumferential direction on the outer circumferential surface of the valve body and contact with the inner circumferential surface of the connector body;
Laundry dryer further comprising.
According to claim 1,
The water supply unit,
a direct water check valve installed in the direct water pipe to prevent water from flowing backward toward the external water supply unit;
Laundry dryer further comprising.
According to claim 1,
The water supply unit,
an internal water supply check valve installed in the internal water supply pipe to prevent backflow of water toward the internal water supply part;
Laundry dryer further comprising.
8. The method of claim 7,
The inner diameter of the valve body is,
Laundry dryer, characterized in that formed to correspond to the size of the inner diameter of the discharge port.
a drum rotatably installed inside the cabinet forming the exterior to accommodate the object to be dried;
a duct unit provided to re-supply the air discharged from the drum to the drum;
a circulation fan providing a flow force to the air moving along the duct;
a heat exchange unit provided on the duct unit and including heat exchange with air circulated along the duct unit;
a steam unit including a steam generator generating steam and supplying steam into the drum; and
a water supply unit for supplying water to the steam unit, including an internal water supply unit and an external water supply unit;
including,
The water supply unit,
an internal water supply pipe connected to the internal water supply part to supply water from the internal water supply part to the steam generator;
a direct water pipe connected to the external water supply unit to supply water from the external water supply unit to the steam generator;
a water supply inlet pipe connected to the steam generator and through which water from the internal water supply unit or water from the external water supply unit is introduced;
a water supply connector connecting the internal water supply pipe, the direct water pipe, and the water supply inlet pipe; and
a check valve unit installed in at least one of the direct water pipe or the internal water supply pipe to prevent the water of the steam generator from flowing backward;
Laundry dryer comprising a.
14. The method of claim 13,
The check valve unit,
a connecting holder connecting the two tubes; and
a check valve inserted and coupled to the connecting holder;
Laundry dryer comprising a.
15. The method of claim 14,
The connecting holder is
A holder body formed in a cylindrical shape so that both ends in the axial direction are respectively inserted into the tube; and
a guide protrusion formed to protrude from the outer circumferential surface of the holder body to guide the assembly direction and position;
Laundry dryer comprising a.
14. The method of claim 13,
The check valve unit,
a first direct water check valve installed in the direct water pipe to prevent water from flowing backward toward the external water supply unit; and
a second direct water check valve disposed between the first direct water check valve and the water supply connector;
Laundry dryer comprising a.

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