CN113529374A

CN113529374A - Laundry dryer

Info

Publication number: CN113529374A
Application number: CN202110412055.3A
Authority: CN
Inventors: 崔敬民; 朴秀原; 蒋薰
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2020-04-16
Filing date: 2021-04-16
Publication date: 2021-10-22
Also published as: KR20210128260A; US20210324568A1; EP3896215A1

Abstract

The present invention relates to a laundry dryer including a water supply connector for connecting an internal water supply pipe, a straight water pipe, and a water supply inflow pipe, the water supply connector including a connector body and a connector prevention valve combined inside the connector body for preventing water from flowing back to a supply part, thereby preventing water from flowing back to a water supply source side, and a check valve is installed only through an assembly process of the connector and the pipe, thereby having an effect of improving assemblability.

Description

Laundry dryer

Technical Field

The present invention relates to a laundry dryer, and more particularly, to a laundry dryer in which high-temperature steam is injected into a drum through a steam part.

Background

Recently, a laundry treating apparatus capable of removing moisture from laundry by performing a drying process has appeared. In the related art laundry treating apparatus, laundry is dried by supplying hot wind to a drum for receiving the laundry, so that not only can a drying time of the laundry be greatly shortened, but also the laundry can be sterilized and disinfected

In addition, there is also a related art laundry treating apparatus which supplies steam (steam) to laundry in the laundry treating apparatus which performs the drying process to remove wrinkles on the laundry or improve drying efficiency or perform sterilization, etc.

Korean patent laid-open No. 10-1435823 discloses a laundry treating apparatus that supplies steam to laundry and then performs drying.

In the related art laundry treating apparatus, a water supply connector for connecting an external water supply source, a water supply drum, and a steam generator is disclosed.

However, when negative pressure is generated in an external water supply source simply including tap water or the like or reverse osmosis pressure is generated by straight water, there is a problem in that water in the water supply tank or water in the steam generator may flow backward, thereby contaminating the water.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the conventional laundry dryer, and an object of the present invention is to provide a laundry dryer which prevents contamination of an external water supply source by preventing the reverse flow of water.

In order to achieve the above object, the laundry dryer of the present invention may include: a drum rotatably provided inside the cabinet for forming an external appearance, and for accommodating the objects to be dried; a duct part provided to resupply the air exhausted from the drum to the drum; a circulation fan that provides a flow force to air moving along the duct portion; a heat exchange portion provided on the duct portion and heat-exchanging air circulating along the duct portion; a steam part having a steam generator for generating steam and supplying the steam (steam) to the inside of the drum; and a water supply part having an internal water supply part and an external water supply part and supplying water to the steam part.

The water supply part may include: an internal water supply pipe connected with the internal water supply part to supply water of the internal water supply part to the steam generator; a straight water pipe connected with the external water supply part to supply water of the external water supply part to the steam generator; a water supply inflow pipe connected to the steam generator such that water of the internal water supply part or water of the external water supply part flows into the water supply inflow pipe; a water supply connector connecting the internal water supply pipe, the straight water pipe, and the water supply inflow pipe; and a check valve part provided with at least one of the straight water pipe or the internal water supply pipe to prevent the water of the steam generator from flowing backward.

The check valve portion may include: a connecting seat for connecting the two pipes; and a check valve inserted into and coupled to the coupling seat.

The connection socket may include: a seat main body formed in a cylindrical shape, both side end portions of the seat main body in an axial direction being respectively inserted into an inside of the tube; and a guide protrusion formed to protrude from an outer circumferential surface of the seat main body and guiding an assembling direction and an assembling position.

The check valve portion includes: a first straight water check valve provided to the straight water pipe to prevent water from flowing backward to the external water supply part; and a second straight water check valve disposed between the first straight 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 may include: a drum rotatably provided inside the cabinet for forming an external appearance, and for accommodating the objects to be dried; a duct part provided to resupply the air exhausted from the drum to the drum; a circulation fan that provides a flow force to air moving along the duct portion; a heat exchange part provided on the duct part and heat-exchanging with air circulating along the duct part; a steam part having a steam generator for generating steam and supplying the steam (steam) to the inside of the drum; and a water supply part having an internal water supply part and an external water supply part and supplying water to the steam part; the water supply part may include: an internal water supply pipe connected with the internal water supply part to supply water of the internal water supply part to the steam generator; a straight water pipe connected with the external water supply part to supply water of the external water supply part to the steam generator; a water supply inflow pipe connected to the steam generator such that water of the internal water supply part or water of the external water supply part flows into the water supply inflow pipe; a water supply connector connecting the internal water supply pipe, the straight water pipe, and the water supply inflow pipe; the water supply connector may include: a connector body in which a flow path for communicating the internal water supply pipe, the straight water pipe, and the water supply inflow pipe is formed; and a connector prevention valve coupled to an inside of the connector body to prevent water from flowing backward to the external water supply part.

The connector body may include: a discharge port connected to the water supply inflow pipe, the discharge port discharging water flowing from the internal water supply unit or the external water supply unit to the water supply inflow pipe; an internal water supply inlet connected to the discharge port and coupled to the internal water supply pipe, the water of the internal water supply unit flowing into the internal water supply inlet; and a straight water inlet connected to the discharge port and combined with the straight water pipe, wherein water in the straight water pipe flows into the straight water inlet.

The connector prevention valve may be insertedly coupled to the straight water inflow port.

The straight water inflow port may be formed to have an inner diameter larger than that of the discharge port.

The straight water inflow port may be formed to have an outer diameter larger than that of the discharge port.

The straight water inflow port may include an assembly guide protrusion formed to protrude from an outer circumferential surface to guide an insertion position of the connector prevention valve.

The straight water inflow port may further include a direction indicating protrusion connected to an axial surface of the guide protrusion and formed to be protruded in a triangular prism shape to indicate an assembling direction.

The connector prevention valve may include: a valve body formed in a cylindrical shape to be inserted and coupled to the connector body; and a valve discharge port that is formed to extend from one axial end of the valve body so as to have a reduced diameter, is disposed inside the connector body, and discharges water flowing in from the straight water pipe, thereby blocking the flow of water flowing in from the internal water supply pipe or the water supply inflow pipe.

The connector prevention valve may further include a coupling support step formed to extend from the other side end portion in the axial direction of the valve main body toward the outer side in the radial direction and supported by the connector main body.

The connector prevention valve may further include a coupling protrusion formed to protrude in a circumferential direction on an outer circumferential surface of the valve main body and contacting the inner circumferential surface of the connector main body.

The water supply part may further include a straight water check valve provided at the straight water pipe to prevent water from flowing backward to the external water supply part.

The water supply part may further include an internal water supply check valve provided at the internal water supply pipe to prevent water from flowing backward to the internal water supply part.

The inner diameter of the valve body may be sized to correspond to the inner diameter of the discharge port.

As described above, according to the laundry dryer of the present invention, the check valve is provided inside the connector, and thus, there is an effect that it is possible to prevent water from flowing back to the water supply source side.

Further, the check valve can be attached only by a process of inserting and coupling the check valve into the connector and assembling the connector and the pipe, and therefore, there is an effect that the assembling property can be improved.

In addition, the check valve can be mounted even if only the connector is replaced on the existing pipe.

Drawings

Fig. 1 is a view for explaining an external appearance of a laundry dryer according to an embodiment of the present invention.

Fig. 2 is a sectional view for explaining an internal structure of a laundry dryer according to an embodiment of the present invention.

Fig. 3 is a diagram illustrating a piping structure of a water supply part and a steam part of a laundry dryer according to an embodiment of the present invention.

Fig. 4 is a view for explaining a check valve of a laundry dryer according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a diagram for explaining a piping structure of a water supply part and a steam part of a laundry dryer according to another embodiment of the present invention.

Fig. 7 is a view for explaining a water supply connector of a washing dryer according to another embodiment of the present invention.

Fig. 8 is a cross-sectional view of fig. 7.

Fig. 9 is a perspective view for explaining a structure of a connector prevention valve of a laundry dryer according to another embodiment of the present invention.

Description of the reference numerals

1: laundry dryer

20: the roller 30: pipe section

40: heat exchange portion 43: circulating fan

80: water supply part

81: internal water supply portion 82: external water supply part

83: internal water supply pipe 84: straight water pipe

85: water supply inflow pipes 86, 86': water supply connector

87: check valve part

90: the steam part 91: steam generator

861: connector body 862: check valve of connector

871: connecting seat 872: check valve

Detailed Description

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

In the present invention, various changes may be made and embodiments may be made, and specific embodiments will be shown in the drawings and will be described in detail in the detailed description. It is not intended to limit the present invention to the specific embodiments, but should be construed to include all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

In the present invention, the terms first, second, etc. are used for explaining a plurality of constituent elements, however, these structural elements may not be limited to these terms. These terms are used only for distinguishing one constituent element from another constituent element. For example, the first component may be the second component, and similarly, the second component may also be the first component, without departing from the scope of the present invention.

The term "and/or" may include a combination of the plurality of items described in association with each other or any one of the plurality of items described in association with each other.

It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled or connected to the other element or intervening elements may also be present. In contrast, where an element is "directly connected" or "directly connected" to another element, it is understood that there is no other element present therebetween.

The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless the context clearly dictates otherwise, expressions in the singular include a plurality of expressions.

The term "comprising" or "having" as used in this specification is to be understood as meaning the presence of the features, numbers, steps, actions, elements, components or combinations thereof disclosed in the specification, and also to be understood as not excluding the presence or addition of one or more other features, numbers, steps, actions, elements, components or combinations thereof in advance.

Unless defined otherwise, all terms including technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art. Terms commonly used, such as terms defined in dictionaries, should be interpreted as having a meaning that is consistent with the context of the relevant art and should not be interpreted in an ideal or excessive form unless explicitly defined in the specification.

Also, the following embodiments are provided for more complete description to those skilled in the art, and the shapes and sizes of the respective elements in the drawings may be exaggerated for more clear description.

Fig. 1 shows a diagram for explaining an external appearance of a laundry dryer according to an embodiment of the present invention, and fig. 2 shows a sectional view for explaining an internal structure of the laundry dryer according to the embodiment of the present invention.

As shown in fig. 1 and 2, a cabinet 10 for forming an external appearance of a laundry dryer 1 includes: a front panel 11 for constituting a front surface of the laundry dryer 1; a back panel 12 for forming a rear surface of the laundry dryer 1; a pair of side panels 14 for constituting the side surfaces of the laundry dryer 1; and an upper panel 13 for constituting a top surface of the laundry dryer 1.

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

A control panel 117 is provided on the front panel 11.

The control panel 117 may be provided with: an input unit 118 that receives a control instruction from a user; a display unit 119 that outputs information such as a control command that can be selected by a user; and a main control unit (not shown) for controlling commands for executing the program of the laundry dryer 1.

On the other hand, the input unit 118 may be configured to include: a power supply request unit for requesting power supply to the laundry dryer 1; a process input section for allowing a user to select a desired process among a plurality of processes; and an execution request unit that requests the start of execution of the process selected by the user.

The display unit 119 may include: a display panel that can output characters and/or graphics; and a speaker capable of outputting voice signals and sounds; at least one of (1). The user can easily grasp the status, remaining time, and the like of the program being executed by the information output from the display unit 119.

Provided inside the cabinet 10 are a drum 20 rotatably provided inside the cabinet 10 and providing a space for accommodating laundry (objects to be dried), a duct part 30 forming a flow path for resupplying air discharged from the drum 20 to the drum 20, and a heat exchange part 40 dehumidifying and heating the air flowing into the duct part 30 and resupplying the air to the drum 20.

The drum 20 includes a drum main body 21 of a cylindrical shape, the drum main body 21 being formed such that a front surface thereof is open; inside the case 10, there may be provided: a first support part 22 rotatably supporting the front surface of the drum main body 21; and a second support portion 23 rotatably supporting a rear surface of the drum main body 21.

The first support portion 22 may be configured to include: a first fixed body 22a fixed inside the case 10; a drum input port 22b which is provided to penetrate the first fixed body 22a, thereby communicating the input port 111 with the interior of the drum main body 21; and a first support 22c provided on the first fixing body 22a and inserted into the front surface of the drum main body 21.

The first support part 22 may further include a connecting body 22d for connecting the input port 111 and the drum input port 22b with each other. As shown, the connecting body 22d may be provided in a pipe shape extending from the drum input port 22b toward the input port 111. Further, the connecting body 22d may be provided with an air outlet 22e communicating with the duct portion 30.

As shown in fig. 2, the air outlet 22e is a passage through which the air inside the drum main body 21 can move to the duct portion 30, and may be a through hole penetrating the connection main body 22 d.

The second support portion 23 includes: a second fixed body 23a fixed inside the case 10; and a second support 23b provided on the second fixed body 23a and inserted into the rear surface of the drum main body 21.

The second support portion 23 further includes an air inflow port 23c provided to penetrate the second fixing body 23a and communicating the inside of the drum main 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 23 c.

The cylindrical drum main body 21 can be rotated by various types of driving portions 50.

For example, fig. 2 shows an embodiment of the driving part 50, the driving part 50 comprising: a drum motor 51 fixed inside the cabinet 10; a pulley 52 rotated by the drum motor 51; a belt 53 for coupling the circumferential surface of the pulley 52 and the circumferential surface of the drum main body 21.

In this case, the first supporting part 22 may further include a first roller R1 rotatably supporting the circumferential surface of the drum main body 21; the second support portion 23 may further include a second roller R2 rotatably supporting the circumferential surface of the drum main body 21.

However, the present invention is not limited thereto, and a direct drive type driving part in which the drum motor 51 is directly connected to the drum 20 without a pulley and a belt and rotates the drum 20 may be employed; and, of course, fall within the scope of the invention. For convenience of explanation, the embodiment of the driving unit 50 shown in the drawings will be described with reference to the drawings.

The duct portion 30 includes: an exhaust duct 31 connected to the air outlet 22 e; a supply duct 32 connected to the air inflow port 23 c; and a connection duct 33 for connecting the exhaust duct 31 and the supply duct 32, and provided with a heat exchange portion 40 inside thereof.

The exhaust duct 31 may communicate with the front of the drum 20, and the supply duct 32 may communicate with the rear of the drum 20.

The heat exchange part 40 may be provided as various means capable of sequentially dehumidifying and heating the air flowing into the duct part 30. For example, the heat exchange portion 40 may be a heat pump system.

The heat exchange portion 40 as the heat pump system method may include: a circulation fan 43 for moving air along the duct portion 30; a first heat exchanger (heat absorbing part) 41 that reduces the humidity of the air flowing into the duct part 30 and performs a dehumidifying function; and a second heat exchanger (heat generating portion) 42 that is provided inside the duct portion 30 and heats the air passing through the first heat exchanger 41.

The circulation fan 43 is provided to include: an impeller 43a provided inside the duct portion 30; and an impeller motor 43b for rotating the impeller 43a, and providing a flow force to the air moving along the duct portion 30.

The impeller 43a may be disposed at any one of the exhaust duct 31, the connection duct 33, and the supply duct 33, and fig. 2 shows an embodiment in which the impeller 43a is disposed at the connection duct 33, but the present invention is not limited thereto, and the following description will be made with reference to an embodiment in which the impeller 43a is disposed at the connection duct 32 for convenience of description.

The heat exchange portion 40 may perform heat exchange with air circulating along the duct portion 30.

The heat absorbing portion 41 and the heat generating portion 42 are disposed inside the connecting duct 33, and are sequentially disposed in a direction from the exhaust duct 31 toward the supply duct 32, and are connected to each other via a refrigerant pipe 44 for forming a circulation flow path of the refrigerant.

The heat absorbing unit 41 is a device that cools air and evaporates the refrigerant by transferring heat of the air flowing into the exhaust duct 31 to the refrigerant.

The heat generating portion 42 is a device that heats air and condenses the refrigerant by transferring heat of the refrigerant passing through the compressor 45 to the air.

The compressor 45 compresses the refrigerant heat-exchanged with the air circulating along the pipe portion 30 by receiving a rotational force provided by the compressor motor 45 a.

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

As described above, a configuration known in the art may be adopted as to the configuration of the heat exchange portion 40 of the heat pump system type including the heat absorbing portion 41 and the heat generating portion 42, and a detailed configuration thereof will be omitted.

On the other hand, the laundry dryer 1 of the present invention further includes a water collecting portion 60 to collect condensed water condensed from the air passing through the heat absorbing portion 41 and collected on the bottom surface of the connection duct 33.

The condensed water condensed in the heat absorbing part 41 may be collected by the water collecting part 60 for the first time and then collected by the water storage part 70 for the second time. The water collecting part 60 may be located inside the connection pipe 33 as shown, or may be additionally provided in a space separated from the connection pipe 33.

The condensed water collected by the water collecting part 60 for the first time is supplied to the water storage part 70 through the condensed water supply pipe 61. At this time, a condensate pump 62 is provided in the condensate supply pipe 61 in order to smoothly discharge the condensate.

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

The user may draw the water storage tank 72 out of the cabinet 10 and remove the condensed water, and then install the water storage tank 72 into the cabinet 10 again. Therefore, the laundry dryer of the present invention may be installed in a place where a drain opening or the like is not installed.

In more detail, the water storage part 70 may be configured to include: a water storage tank 72 detachably provided in the tank 10 and providing a space for storing water; the inflow port 72a is provided to penetrate the water storage tank 72 and allows water discharged from the condensed water supply pipe 61 to flow into the water storage tank 72.

The water storage tank 72 may be provided as a drawer type tank drawn out from the cabinet 10, and in this case, a water storage portion mounting hole for inserting the water storage tank 72 is provided on the front panel 11 of the cabinet.

A panel (panel)71 is fixed to the front surface of the water tank 72, and the panel 71 is detachably joined to the water storage portion 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 held. In this case, the panel 71 may also function as a handle for drawing the water storage tank 72 out of the tank or inserting the water storage tank 72 into the tank 72.

The inflow port 72a is formed to receive the condensate discharged from the condensate nozzle 63 fixed to the casing 10. The condensed water nozzle 63 may be fixed to the upper panel 13 of the cabinet 10 such that the condensed water nozzle 63 is positioned at an upper portion of the inflow port 72a when the water storage tank 72 is inserted into the cabinet 10.

The user may drain the water inside the storage tank 72 by turning or tilting the storage tank 72 in a direction in which the inflow port 72a is located after the storage tank 72 is drawn out of the cabinet 10. The storage tank 72 may further include a communication hole 72b provided to penetrate an upper surface of the storage tank 72 such that water inside the storage tank 72 is easily discharged through the inflow port 72 a.

In addition, the laundry dryer 1 of the present invention includes a first filter part F1 and a second filter part F2, and the first filter part F1 and the second filter part F2 are devices for removing foreign matters such as lint and dust generated in the process of drying laundry such as laundry.

The first filtering portion F1 is provided in the exhaust duct 31, and the exhaust duct 31 can filter foreign substances contained in the air discharged from the drum 20 for the first time.

The second filter F2 is disposed downstream of the first filter F1 in the flow direction of the air so as to be able to filter foreign substances contained in the air passing through the first filter F1 a second time. More specifically, as shown in the drawing, the second filter unit F2 is preferably disposed on the upstream side of the first heat exchanger 41 in the connecting duct 33. This is to prevent foreign substances contained in the air from contaminating the first heat exchanger 41 by being collected in the first heat exchanger 41, which is a heat absorbing part, or to reduce the performance of the first heat exchanger 41.

As for the detailed configuration of the first filter house F1 and the second filter house F2, any means known in the art may be employed, and thus, the description of the detailed configuration thereof will be omitted.

On the other hand, the laundry dryer 1 of the present invention further comprises a supply part 80 and a steam part 90, the supply part 80 comprising a first supply part 81 and a second supply part 82, the steam part 90 receiving water from the supply part 80 and generating steam.

The first and

second supply parts

81 and 82 may be provided to supply water to the steam part 90 from water supply sources different from each other.

The steam section 90 may be arranged to receive fresh water and produce steam, rather than receiving condensed water. The steam part 90 may include a steam generator 91, a steam pipe 92, a steam nozzle 93, and a liquid reservoir 94 (see fig. 3).

The steam generator 91 may receive water from the supply part 80 and generate steam by heating the received water. The structure of the piping for allowing water to flow into the steam generator 91 and for discharging steam will be described later.

On the other hand, in the present embodiment, a method (hereinafter, referred to as "total heating method") has been described in which the steam generator 91 heats a predetermined amount of water contained therein by a heater (not shown) and generates steam.

The steam nozzle 93 may serve to inflow steam generated by the steam generator 91 and to spray the steam toward the inside of the drum 20.

The steam pipe 92 connects the steam generator 91 and the steam nozzle 93, and a flow path for flowing steam is formed inside the steam pipe 92. Therefore, the steam generated in the steam generator 91 can flow along the steam pipe 92 and be discharged into the drum 20 through the steam nozzle 93.

The accumulator 94 is disposed in the steam pipe 92, and when the steam generated in the steam generator 91 is condensed in the steam pipe 92 to form condensed water, the accumulator 94 performs a function of separating the condensed water and the steam. At this time, the condensed water may flow into the steam generator 91 again or into the sump portion 60.

For example, the first supply part 81 may be regarded as corresponding to the internal water supply part 81, and the second supply part 82 may be regarded as corresponding to the external water supply part 82.

The steam part 90 may be controlled to receive water from the internal and external

water supply parts

81 and 82 and supply the generated steam to the inside of the drum main body 21, as needed.

The external water supply part 82 may include a direct water valve 82a adjacent to the back panel 13 or fixed to the back panel 13, and a direct water pipe 82b supplying the steam part 90 with water supplied from the direct water valve 82a

The direct water valve 82a may be provided in combination with an external water supply source. For example, the straight water valve 82a may be combined with a water supply pipe (not shown) extending toward the back of the tank. Thus, the steam part 90 may directly receive water through the direct water valve 82 a.

Therefore, even if the internal water supply part 81 is omitted or water is not stored in the internal water supply part 81, the steam part 90 may receive water for generating steam through the direct water valve 82a as necessary.

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

The control part 100 may be provided to the control panel 117, but may be provided by a separate control panel as shown in fig. 1, in order to prevent the control panel 117 from being overloaded and to prevent an increase in manufacturing cost.

At this time, the control part 100 may be disposed adjacent to the steam part 90. The control part 100 may be provided at the side panel 14 for providing the steam part 90, thereby enabling to shorten the length of a control wire or the like connected to the steam part 90.

On the other hand, it is preferable that the steam part 90 is disposed adjacent to the straight water valve 82 a. This prevents unnecessary residual water from remaining in the straight water pipe 82b, and allows immediate water reception when necessary.

On the other hand, the internal water supply part 81 includes: a storage tank (tank)810 for holding water; a supply pump 820 receiving water from the storage water tank 810 and supplying the water to the steam part 90; a water tank case 830 providing a space for accommodating the storage water tank 810 and the supply pump 820; and an internal water supply pipe 83 for connecting the supply pump 820 and the steam part 90, and having a flow path formed therein through which water can flow.

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

On the other hand, fig. 3 shows a piping structure diagram for explaining a water supply part and a steam part of the laundry dryer according to an embodiment of the present invention, fig. 4 shows a diagram for explaining a check valve of the laundry dryer according to an embodiment of the present invention, and fig. 5 shows a cross-sectional view of fig. 4.

Referring to fig. 2 to 5, 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 as follows.

The supply part 80 of the present invention may include: an internal water supply unit 81 for supplying water from the storage tank 810 to the steam unit 90; an external water supply unit 82 for supplying water from an external water supply source to the steam unit 90; a water supply connector 86 capable of receiving water from a water supply portion of at least one of the internal water supply portion 81 and the external water supply portion 82; and a water supply inflow pipe 85 for connecting the water supply connector 86 and the steam part 90.

In addition, the supply part 80 may further include a check valve part 87, and the check valve part 87 prevents water or steam from flowing backward in at least any one of the internal water supply part 81, the external water supply part 82, and the steam part 90.

Specifically, the internal water supply part 81 of the supply part 80 may include: an internal water supply pipe 83 for supplying water in the storage water tank 810 to the steam generator 91.

The external water supply part 82 may include a straight water pipe 84, and the straight water pipe 84 receives water by communicating with an external water supply source and supplies the water to the steam generator 91.

The internal water supply pipe 83 and the straight water pipe 84 may be connected with a water supply connector 86. As a result, the water of the internal water supply unit 81 or the water of the external water supply unit 82 can flow into the water supply connector 86. The water supply connector 86 and the steam generator 91 may be connected via the water supply inflow pipe 85, so that the water of the internal water supply part 81 or the water of the external water supply part 82 may be supplied to the steam generator 91.

The internal water supply pipe 83 may be a pipe having a flow path through which water can flow.

One end of the internal water supply pipe 83 may communicate with the storage water tank 810 or the supply pump 820, and the other end of the internal water supply pipe 83 may be connected with the water supply connector 86.

For example, the internal water supply pipe 83 includes a first internal water supply pipe 83a and a second internal water supply pipe 83 b.

The check valve part 87 may include an internal water supply check valve 87c, and the internal water supply check valve 87c prevents the water flowing in the first and second internal

water supply pipes

83a and 83b from flowing backward. One side end of the first internal water supply pipe 83a may communicate with the storage water tank 810 or the supply pump 820, and the other side end of the first internal water supply pipe 83a may be connected with the internal water supply check valve portion 87 c.

In addition, one side end of the second internal water supply pipe 83b may be connected with the internal water supply check valve portion 87c, and the other side end of the second internal water supply pipe 83b may be connected with the water supply connector 86.

The straight water pipe 84 may be a pipe having a flow path through which water flows. One side end of the straight water pipe 84 may be connected with the external water supply part 82, and the other side end of the straight water pipe 84 may be connected with the water supply connector 86.

The check valve portion 87 may include

straight check valves

87a, 87b, and the

straight check valves

87a, 87b prevent the water flowing in the straight water pipe 84 from flowing backward.

The straight water check valve may be plural.

For example, the straight water pipes 84 may include a first straight water pipe 84a, a second straight water pipe 84b, and a third straight water pipe 84 c. One side end of the first straight water pipe 84a may be connected to the straight water valve 82a, and the other side end of the first straight water pipe 84a may be connected to the first straight water check valve portion 87 a.

In addition, both side end portions of the second straight water pipe 84b may be connected with the first straight check valve portion 87a and the second straight check valve portion 87b, respectively. And, one side end of the third straight water pipe 84c may be connected with the second straight water check valve portion 87b, and the other side end of the one side end of the third straight water pipe 84c may be connected with the water supply connector 86. Therefore, check valve portions 87 may be disposed between the first straight water tube 84a and the second straight water tube 84b and between the second straight water tube 84b and the third straight water tube 84c, respectively.

The supply part 80 may include a water supply inflow pipe 85, the water supply inflow pipe 85 being connected with the steam generator 91 and supplying water of the internal water supply part 81 or water received from the external water supply part 82 to the steam generator 91.

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

The water supply connector 86 may connect the internal water supply pipe 83, the straight water pipe 84, and the water supply inflow pipe 85. In detail, the water supply connector 86 may be a pipe opened in three directions. For example, the water supply connector 86 may be a T-shaped connector.

The check valve portion 87 may be configured to prevent the fluid from flowing backward. Specifically, the check valve portion 87 may be configured to be disposed in the flow path so as not to block the flow of the fluid when the fluid flows in a direction set at the time of design (hereinafter, may be referred to as a "forward direction"), and to block the flow of the fluid when the fluid flows in a reverse direction opposite to the set direction (hereinafter, may be referred to as a "reverse direction").

The internal water supply check valve portion 87c and the straight water check valve portion 87a may be identical in structure.

The laundry dryer of the type that sprays high-temperature steam into the drum is configured to supply water to the inside of the steam generator by using an internal water supply part or an external water supply part.

On the other hand, in the case of an external water supply unit connected to a water supply line or the like to receive clean water, there is a possibility that negative pressure is generated according to conditions, and in the case of an internal water supply unit supplied with water by the operation of the supply pump 820, there is a possibility that negative pressure is generated according to the operation conditions of the pump.

In addition, in this case, reverse osmosis pressure against the straight water or reverse osmosis pressure against the stored water may occur.

On the other hand, when water is stored in the internal water supply part 81 or the steam generator 91 for a long time, contamination such as propagation of bacteria in water may occur. When the polluted water is reversely flowed due to the reverse osmosis pressure or the pressure difference, the upper water passage or the storage tank 810 storing clean water may be polluted.

Therefore, it is necessary to prevent the contaminated water from flowing backward to the external water supply unit 82 in the internal water supply unit 81 or the steam generator 91.

Therefore, in the laundry dryer 1 according to the embodiment of the present invention, the check valve portion 87 may be provided in the straight water pipe 84 or the internal water supply pipe 83, so that the water in the steam generator 91 or the internal water supply portion 81 is prevented from flowing backward.

Next, the check valve portion 87 will be described in detail.

As previously described, the check valve portion 87 may include: a first straight water check valve 87a provided to the straight water pipe 84 and preventing water from flowing backward to the external water supply part 82; and a second straight water check valve 87b disposed between the first straight water check valve 87a and the water supply connector 86.

In addition, the check valve portion 87 may be provided in the internal water supply pipe 83 to prevent water from flowing back to the internal water supply portion 82.

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

Also, an internal water supply check valve 87c may be disposed between the first and second internal

water supply pipes

83a and 83 b.

With the above configuration, the water that has flowed back can be prevented from flowing into the internal water supply unit 81 and the external water supply unit 82.

In particular, when the straight water pipe 84, which is necessary to block the reverse flow in order to prevent the water quality from being polluted, is provided with the check valve units 87 in a double manner, there is an effect that the reverse flow can be blocked even when any one of the check valve units 87 is broken.

This has an effect of stably protecting the external water supply unit 82 from the reverse flow, as compared with the case where the check valve unit 87 is provided in the supply water inflow pipe 85.

For example, it is assumed that one check valve portion 87 is provided in each of the internal water supply pipe 83, the straight water pipe 84, and the water supply inflow pipe 85. In this case, the water flowing backward in the steam generator 91 is blocked by the two check valve portions 87 while flowing to the external water supply portion 82.

However, the water flowing backward from the internal water supply unit 81 to the external water supply unit 82 via the internal water supply pipe 83 and the water supply connector 86 is blocked by only one check valve unit 87 disposed in the straight water pipe 84. That is, when water flows backward from the internal water supply unit 81 to the external water supply unit 82, the check valve unit 87 disposed in the internal water supply pipe 83 is disposed in the forward direction, and therefore, the function of blocking the backward flow cannot be exerted, and only the check valve unit 87 disposed in the straight water pipe 84 exerts the function of preventing the backward flow.

In order to solve the above problem, the present invention provides two check valve portions 87 provided in the straight water pipe 84, and includes: and a double blocking effect against a reverse flow which may occur in the internal water supply part 81 or the steam generator 91. Fig. 4 and 5 are views showing an embodiment of the check valve portion 87.

The check valve portion 87 of the present invention may include a connection seat 871 and a check valve 872.

Specifically, the check valve portion 87 may include: a connecting holder 871 for connecting two tubes; and a prevention valve 872 inserted into and coupled to the connection seat 871, thereby blocking the reverse flow of fluid.

The coupling seat 871 may include a seat body 871a and a guide protrusion 871 b. In detail, the connection holder 871 may include: a seat body 871 a; and a guide protrusion 871b formed to protrude toward the outside in the circumferential direction at the outer circumferential surface of the seat main body 871 a.

For example, the seat main body 871a may be formed in a cylindrical shape so that fluid can flow therein, and both side ends thereof may be inserted into the internal water supply part 81 or the external water supply part 82, respectively. For example, the seat body 871a may be provided to be insertable into at least any one of the internal water supply pipe 83 or the straight water pipe 84 or the water supply inflow pipe 85.

On the other hand, a discharge port 871d is formed at the end of the seat body 871a in the direction (forward direction) in which the fluid is discharged.

The seat body 871a may be formed such that the inner diameter thereof gradually decreases from the vicinity of the discharge port 871d toward the discharge port 871 d.

In other words, the spout 871d can be formed by gradually reducing the inner diameter of the seat body 871 a.

The guide protrusion 871b is formed by protruding and extending from the outer peripheral surface of the seat main body 871a toward the outside in the radial direction, and the guide protrusion 871b can guide the assembling direction and the assembling position.

As an example, the guide protrusion 871b may be formed to protrude in a ring shape along the outer circumferential surface of the seat body 871 a.

In addition, the coupling seat 871 may further include a direction indicating protrusion 871c that is coupled to a side surface of the guide protrusion 871b in the axial direction, is formed to protrude from the outer circumferential surface of the seat main body 871a in a triangular prism shape toward the outside in the radial direction, and indicates an assembling direction.

The direction indicating protrusion 871c may extend from a surface of the guide protrusion 871b toward the length direction of the seat body 871 a. For example, the direction indicating protrusion 871c may extend from the guide protrusion 871b toward the ejection port 871 b.

Therefore, in the case of assembling the connection seat 871 to the tube, the operator can recognize that the mark indicates the direction of the triangle (or arrow) of the protrusion 871c in the direction, and insert the prevention valve 872 into the connection seat 871 in consideration of the flow direction of the fluid set at the time of design, and then assemble the connection seat 871 to the tube. That is, by the guide protrusion 871b and the direction indicating protrusion 871c of the present invention, erroneous assembly can be prevented.

The prevention valve 872 may include a valve body 872a, a valve discharge port 872b, a bonding support 872c, and a bonding protrusion 872 d.

Specifically, the prevention valve 872 includes a valve body 872a inserted into the connecting seat 871, a valve discharge port 872b for discharging fluid flowing in the forward direction is formed at one end of the valve body 872a, a coupling support seat 872c engaged with and supported by an end of the connecting seat 871 is formed at the other end of the valve body 872a, and a coupling protrusion 872d is formed on an outer circumferential surface of the valve body 872a in a protruding manner, and the coupling protrusion 872d is supported in contact with an inner circumferential surface of the connecting seat 871.

As an example, the valve body 872a may be formed in a cylindrical shape to be inserted into the seat body 871 a.

On the other hand, the valve body 872a may have an inner diameter sized to correspond to the inner diameter of the discharge port 871d of the connection seat 871. For example, the valve body 872a may have the same inner diameter as the discharge port 871d of the connection seat 871.

With the above-described configuration, in the present invention, the amount of fluid flowing to the valve body 872a and the amount of fluid discharged through the discharge port 871d can be uniformly maintained, and pulsation or the like caused by inflow of fluid can be prevented.

The valve discharge port 872b may be formed to extend such that the diameter thereof gradually decreases from one axial end of the valve main body 872 a. In this case, the valve discharge port 872b may have various shapes such that the flow path area for discharging the fluid is reduced.

For example, the valve discharge port 872b may be formed by extending a cylindrical valve body 872a such that one axial end thereof gradually narrows in a conical shape.

As another example, the valve discharge port 872b may be formed by narrowing the one-side end portion of the valve body 872a line-symmetrically so as to open in a rectangular shape. That is, one axial end portion of the valve body 872a may be extended to form inclined surfaces gradually approaching each other toward the inside in the opposite direction of the radius, and the extended inclined surfaces may be concentrated to form a rectangular-shaped hole.

With this configuration, the valve discharge port 872b according to the present invention can be disposed inside the seat main body 871a to discharge the inflowing water in the forward direction, thereby preventing or blocking the water from flowing backward in the reverse direction.

The coupling support bench 872c is formed to extend radially outward from the other end of the valve main body 872a and is supported in contact with the seat main body 871. For example, the coupling support 872c may be formed to protrude outward in the radial direction from the other end of the valve body 872a, and may be formed to protrude in a hook (hook) shape in the circumferential direction.

With this configuration, the coupling support table 872c of the present invention can be held in contact with and supported by an end portion of the seat body 871a in the direction in which the fluid flows (an end portion in the direction opposite to the discharge port 871 d). Therefore, even when the inflow pressure of the fluid is large, the check valve 872 can be supported.

The coupling protrusion 872d may be convexly formed in a circumferential direction at an outer circumferential surface of the valve body 872a and contact an inner circumferential surface of the seat body 871 a.

For example, two coupling protrusions 872d may be formed to protrude in a rib (rib) shape in the circumferential direction on the outer circumferential surface of the valve body 872 a.

With this configuration, the coupling protrusion 872d of the present invention can be contact-supported at the inner circumferential surface of the holder main body 871a, and the disengagement of the valve 872 from the connection holder 871 due to the pressure of the fluid can be prevented.

On the other hand, since the prevention valve 872 of the present embodiment has the same structure as the connector prevention valve 862 described later, it can be understood by the structure of the connector prevention valve 862 shown in fig. 9.

On the other hand, fig. 6 is a view illustrating a piping structure of a water supply part and a steam part of a laundry dryer for explaining another embodiment of the present invention, fig. 7 is a view illustrating a water supply connector of a laundry dryer for explaining another embodiment of the present invention, fig. 8 is a sectional view illustrating fig. 7, and fig. 9 is a perspective view illustrating a structure of a connector check valve.

In the present embodiment, the same contents as those of the above-described embodiment of the present invention are omitted, and a detailed description is mainly given with a different configuration to avoid redundant description.

First, in the piping structure of the water supply unit and the steam unit according to the embodiment of the present invention, the water in the internal water supply unit 81 or the steam generator 91 can be prevented from flowing back to the external water supply unit 82 by providing two check valve units 87 in the straight water pipe 84.

On the other hand, as shown in fig. 3, in order to prevent condensed water from accumulating inside the drum when steam is generated, a reservoir 94 may be installed. In this case, the reservoir 94 is coupled to the top frame 24 disposed on the upper side of the drum 20, and a part of the reservoir 94 is disposed to be fixed to the outer circumferential surface of the straight water pipe 84 and to support the straight water pipe 84.

In order to dispose the two check valve portions 87 in the straight water pipe 84, it is necessary to divide the straight water pipe 84 into the first straight water pipe 84a, the second straight water pipe 84b, and the third straight water pipe 84c, to assemble the first straight water check valve 87a between the first straight water pipe 84a and the second straight water pipe 84b, and to assemble the second straight water check valve 87b between the second straight water pipe 84b and the third straight water pipe 84 c.

As described above, in the case where a plurality of components are assembled in a narrow space and connected, there is a possibility of water leakage due to incomplete assembly of the straight water pipe 84 and the check valve portion 87, and condensed water may flow into the inside of the drum 20 due to incomplete installation of the reservoir 94.

To this end, another embodiment of the present invention provides a structure for improving assemblability, improving space efficiency, and preventing water from flowing backward to the external water supply unit 82.

Referring to fig. 2, 6 to 8, a water supply connector 86' according to another embodiment of the present invention will be described in detail as follows.

In this embodiment, the water supply connector 86' may be provided to connect the internal water supply pipe 83, the straight water pipe 84, and the water supply inflow pipe 85 and prevent the water from flowing backward to the external water supply part 81.

The water supply connector 86' includes a connector body 861 and a connector prevention valve 862.

The connector body 861 includes: a flow path for communicating the internal water supply pipe 83, the straight water pipe 84, and the water supply inflow pipe 85 is formed inside the water supply pipe.

Specifically, the connector body 861 may have a tube (pipe) shape that is open in three directions and includes a discharge port 861a, an internal water supply inlet 861b, and a straight water inlet port 861 c.

For example, the connector body 861 may be a T-shaped connector in which the discharge port 861a and the straight water inlet port 861c are linearly connected to each other on the same axis, and the internal feed water inlet port 861b is vertically connected to the discharge port 861 a.

More specifically, the discharge port 861a may be coupled to the water supply inflow pipe 85 to discharge the water flowing in from the internal water supply unit 81 or the external water supply unit 82 to the water supply inflow pipe 85.

For example, the discharge port 861a may be formed in a cylindrical shape, a flow path into which water for generating steam flows may be formed inside the discharge port 861a, and a discharge protrusion 861aa that guides the coupling between the discharge port 861a and the feed water inflow pipe 85 may be formed so as to protrude in the circumferential direction on the outer circumferential surface of the discharge port 861 a.

The internal water supply inlet 861b communicates with the discharge port 861a and is connected to the internal water supply pipe 83, thereby providing a flow path for the water discharged from the internal water supply unit 81 to flow into.

For example, the internal water supply inlet 861b may be formed in a cylindrical shape, and a flow path for allowing water discharged from the internal water supply unit 81 to flow therein may be formed in the internal water supply inlet 861b, and a water supply protrusion 861ba may be formed on an outer circumferential surface of the internal water supply inlet 861b to protrude in a circumferential direction, and the water supply protrusion 861ba may guide coupling between the internal water supply inlet 861b and the internal water supply pipe 83. Further, a steam pipe mounting surface 861bb for guiding a position where the steam pipe 92 is to be arranged may be formed on an outer peripheral surface of the internal water supply inlet 861 b.

The inner diameter Φ 2 of the internal feed water inlet 861b may be formed to be the same as the inner diameter Φ 1 of the discharge port 861 a. With the above-described configuration, the water flowing into the internal feed water inlet 861b can be stably discharged into the feed water inlet pipe 85 without changing the pressure and flow rate thereof.

The straight water inflow port 861c may be connected to the discharge port 861a and coupled to the straight water pipe 84, thereby providing a flow path for water of the straight water pipe 82b to flow in.

For example, the straight water inflow port 861c may be formed in a cylindrical shape, and a flow path for allowing water discharged from the external water supply unit 82 to flow therein may be formed in the straight water inflow port 861c, and a straight water protrusion 861ca that guides coupling between the straight water inflow port 861c and the straight water pipe 84 may be formed to protrude in the circumferential direction on the outer circumferential surface of the straight water inflow port 861 c.

In addition, the straight water flow inlet 861c may further include a direction indicating protrusion 861cb formed to extend from the guide protrusion 861ca and indicating an assembling direction.

The direction indicates that the projection 861cb may be formed to protrude from the guide projection 861ca in the shape of a triangular prism or an arrow.

With the above-described configuration, when assembling the water supply connector 86 ', the operator can recognize the direction of the triangle (or arrow) marked with the direction indicating the protrusion 861cb, insert the connector prevention valve 862, which will be described later, into the connector body 861 in consideration of the flow direction of the fluid set at the time of design, and then assemble the water supply connector 86' to the tube. Therefore, the present invention has an effect of being able to prevent erroneous assembly by the direction indicating projection 861 cb.

On the other hand, the inner diameter Φ 3 of the straight water inlet 861c may be formed larger than the inner diameter Φ 1 of the discharge port 861a (Φ 3> Φ 1). Further, the outer diameter of the straight water inlet port 861c may be formed larger than the outer diameter of the discharge port 861 a. Therefore, according to the present invention, there is an effect that the connector prevention valve 862 can be easily inserted into the straight water inflow port 861 c.

The connector prevention valve 862 may be incorporated inside the connector body 861 to prevent water from flowing backward to the external water supply part 82. Specifically, the connector prevention valve 862 may be inserted and coupled to the inside of the straight water inflow port 861 c.

The connector prevention valve 862 may include a valve body 862a, a valve exit 862b, a coupling support 862c, and a coupling boss 862 d.

Specifically, the connector prevention valve 862 includes a valve body 862a inserted into the connector body 861, a valve discharge port 862b for discharging fluid flowing in the forward direction is formed at one end of the valve body 862a, a coupling support base 862c that is locked to and supported by an end of the connector body 861 is formed at the other end of the valve body 862a, and a coupling boss 862d that is supported in contact with an inner peripheral surface of the connector body 861 is formed in a projecting manner on an outer peripheral surface of the valve body 862 a.

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

On the other hand, the inner diameter Φ 4 of the valve body 862a may be formed to have a size corresponding to the inner diameter Φ 1 of the discharge port 861 a. For example, the inner diameter Φ 4 of the valve body 862a may be formed to have the same size as the inner diameter Φ 1 of the discharge port 861 a.

With the above-described configuration, the present invention can uniformly maintain the amount of fluid flowing into the valve body 862a and the amount of fluid discharged through the discharge port 861a, thereby having an effect of preventing pulsation or the like from occurring due to inflow of fluid.

The valve discharge port 862b may be formed to extend from one axial end of the valve main body 862a so as to reduce the diameter thereof. In this case, the valve discharge port 862b may have various shapes in which the cross-sectional area of the flow path is reduced.

For example, the valve discharge port 862b may be formed by extending one end of a cylindrical valve body 862a so as to be tapered.

As another example, the valve outlet 862b may be formed to be line-symmetrically narrowed by one end of the valve body 862a and opened in a rectangular shape. That is, one end of the valve body 862a may be extended to form inclined surfaces close to each other toward the inside in the radial direction, and the extended inclined surfaces may be concentrated to form a rectangular hole.

With this configuration, the valve discharge port 862b according to the present invention is disposed inside the straight water flow inlet 861c, and thus discharges water flowing in the forward direction, thereby blocking water flowing in the reverse direction.

The coupling support 862c may be formed to extend radially outward from the other end of the valve body 862a, and may be supported by being contacted by the connector body 861. For example, the coupling support 862c may be formed to protrude outward in the radial direction from the other end of the valve main body 862a, and protrude in a hook shape along the circumferential direction.

With this configuration, the coupling support 862c of the present invention can be supported by being locked to the end of the straight water inlet 861c in the direction in which the fluid flows (the end opposite to the discharge port 861 a) and by being in contact therewith. Therefore, even in the case where the inflow pressure of the fluid is large, the connector prevention valve 862 can be supported.

The coupling boss 862d may be formed to protrude in a circumferential direction at an outer circumferential surface of the valve body 862a and contact an inner circumferential surface of the straight water inflow port 861 c.

For example, two coupling bosses 862d may be formed to protrude in a rib shape in the circumferential direction on the outer circumferential surface of the valve body 862 a.

With this configuration, the coupling boss 862d of the present invention can be contact-supported at the inner peripheral surface of the straight water inflow port 861c, and the connector prevention valve 862 can be prevented from being detached from the connector body 861 by the pressure of the fluid.

Therefore, according to the water supply connector 86' of the present embodiment, a sufficient backflow prevention effect can be maintained by providing only one check valve portion 87 in the straight water pipe 84. For example, in the present embodiment, the straight water pipe 84 may be composed of the first straight water pipe 84a and the second straight water pipe 84b, and only one straight water check valve 87a may be disposed between the first straight water pipe 84a and the second straight water pipe 84 b.

With the above-described structure, the number of parts to be assembled or connected in a narrow space above the drum 20 can be reduced, and water leakage or condensed water flowing into the drum 20 due to incomplete assembly can be prevented.

In addition, the assemblability and the space efficiency are improved, so that the production efficiency and the repair efficiency can be improved.

In addition, the check valve can be mounted to the existing pipe by merely replacing the connector.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited thereto, and it should be understood that the present invention can be modified or improved by those skilled in the art within the scope of the technical idea of the present invention.

The present invention is not limited to the above embodiments, but may be modified in various ways.

Claims

1. A laundry dryer, comprising:

a drum rotatably provided in the cabinet and accommodating the objects to be dried;

a duct part provided to resupply the air exhausted from the drum to the drum;

a circulation fan that provides a flow force to air moving along the duct portion;

a heat exchange part provided in the duct part and exchanging heat with air;

a steam part which is provided with a steam generator for generating steam and supplies the steam to the inside of the drum; and

a supply part capable of supplying water for generating the steam to the steam part,

the supply section includes:

a first supply part including a storage water tank for storing water and an internal water supply pipe through which the water stored in the storage water tank is supplied to the steam generator;

a second supply part provided with a straight water pipe receiving water from an external water supply source and supplying the water to the steam generator;

a water supply inflow pipe through which the water of the first supply part or the water of the second supply part is supplied to the steam generator;

a water supply connector connecting the internal water supply pipe and the straight water pipe to the water supply inflow pipe; and

and a check valve part provided to at least one of the straight water pipe or the internal water supply pipe to prevent the water of the steam generator from flowing backward.

2. The laundry dryer of claim 1,

the check valve portion includes:

a connection seat connecting at least two of the internal water supply pipe, the straight water pipe, and the water supply inflow pipe; and

and a prevention valve inserted into and coupled to the connection seat.

3. The laundry dryer of claim 2,

the connecting seat includes:

a seat main body formed in a cylindrical shape, both side end portions of the seat main body in an axial direction being inserted into at least one of the internal water supply pipe, the straight water pipe, and the water supply inflow pipe, respectively; and

and a guide projection formed to protrude and extend from an outer circumferential surface of the seat main body to guide an assembling direction and an assembling position of the check valve portion.

4. The laundry dryer of claim 1,

the check valve portion includes:

a first straight water check valve provided to the straight water pipe to prevent water from flowing backward to the second supply part; and

a second straight water check valve disposed between the first straight water check valve and the water supply connector.

5. The laundry dryer of claim 3,

the water supply connector includes:

a connector body in which a flow path for communicating the internal water supply pipe, the straight water pipe, and the water supply inflow pipe is formed; and

and a connector prevention valve coupled to an inside of the connector body to prevent water flowing through a flow path formed in the connector body from flowing backward.

6. The laundry dryer of claim 5,

the connector body includes:

a discharge port coupled to the water supply inflow pipe and discharging the water to the water supply inflow pipe;

an internal water supply inlet connected to the discharge port and coupled to the internal water supply pipe so that water from the first supply unit flows into the internal water supply inlet; and

a straight water inlet connected to the discharge port and coupled to the straight water pipe such that water of the straight water pipe flows into the straight water inlet;

the connector prevents the valve from being inserted into and coupled to the straight water inflow port.

7. The laundry dryer of claim 6,

the inner diameter of the straight water flow inlet is larger than that of the discharge port.

8. The laundry dryer of claim 6,

the outer diameter of the straight water flow inlet is larger than that of the discharge port.

9. The laundry dryer of claim 6,

the straight water inflow port further includes a direction indicating protrusion formed to protrude in a triangular prism shape from the guide protrusion.

10. The laundry dryer of claim 6,

the connector prevention valve further includes:

a valve body inserted into and coupled to the straight water inlet;

a valve discharge port extending from one end of the valve body so that an outer diameter thereof becomes smaller, the valve discharge port being disposed inside the connector body and discharging water flowing in from the straight water pipe and preventing backflow of water flowing in from the internal water supply pipe or the water supply inflow pipe;

a coupling support base extending from the other end of the valve body to the outside in the radial direction and supported by the connector body; and

and a coupling protrusion formed on an outer circumferential surface of the valve body to protrude in a circumferential direction and contacting an inner circumferential surface of the connector body.