Damping panel and dishwasher including same

Abstract

A damping panel according to one embodiment of the present disclosure includes a damping layer including a plurality of pores and configured to absorb noise and a reinforcing layer positioned on one surface of the damping layer and having a density higher than that of the damping layer.

Description

DAMPING PANEL AND DISHWASHER INCLUDING SAME

[0001] The present disclosure relates to a damping panel and a dishwasher including the same, and more specifically, to a damping panel with improved damping performance and thermal insulation performance and a dishwasher including the same.

[0002]

[0003]

[0004] A dishwasher is a device that automatically washes food residue and other debris from dishes using a detergent and washing water.

[0005] A dishwasher includes a case in which a washing tank is provided, a basket for accommodating tableware, a sump for storing washing water, a spray nozzle for spraying the washing water, and a pump configured to pump the washing water in the sump and supply the washing water to the spray nozzle.

[0006] When the dishwasher is in operation, significant noise and vibration are generated. To reduce this noise and vibration, generally, an asphalt damping sheet is attached to the outer surface of the washing tank. However, at least one drying / cooling process is required to attach the asphalt damping sheet to the outer surface of the washing tank. Furthermore, because the outer surface of the washing tank is uneven, it is difficult to expect a strong bond of the asphalt damping sheet.

[0007] Furthermore, the asphalt damping sheet has a relatively high density, which may increase the thermal mass of the dishwasher. This leads to a problem of increased power consumption.

[0008] Furthermore, Patent Document 1 discloses the use of urethane foam as a damping sheet. However, when the urethane foam is installed on a bottom of the washing tank, the urethane foam may be deteriorated by water, resulting in reduced damping performance or reduced strength.

[0009] In addition, in Patent Document 1, when only the urethane foam is used, a main noise source in the dishwasher is low-frequency noise caused by water drops striking a bottom surface of the washing tank; however, there is a drawback in that the low-frequency noise cannot be efficiently reduced.

[0010] [Prior Art Document]

[0011] [Patent Document]

[0012] Patent Document 1: Korean Patent Application Publication No. 10-2019-0017452

[0013]

[0014] An object of the present disclosure is to provide a damping panel that effectively absorbs vibration and noise generated from a dishwasher and has excellent thermal insulation performance, and a dishwasher including the same.

[0015] Another object of the present disclosure is to provide a damping panel that effectively absorbs vibration and noise generated from a dishwasher while preventing performance degradation due to washing water or moisture used in the dishwasher, and a dishwasher including the same.

[0016] Another object of the present disclosure is to provide a damping panel capable of efficiently absorbing low-frequency noise, which is a main noise source in the dishwasher and is caused by water drops striking the bottom surface of the washing tank, and a dishwasher including the same.

[0017] Objects of the present disclosure are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

[0018] In order to achieve the above-described objects, there is provided a damping panel including: a damping layer including a plurality of pores and configured to absorb noise; and a reinforcing layer positioned on one surface of the damping layer and having a density higher than that of the damping layer.

[0019] The damping layer may include at least one of a rigid polyurethane foam, a flexible polyurethane foam, and a semi-rigid polyurethane foam.

[0020] The reinforcing layer may include at least one of glass wool and metal.

[0021] The reinforcing layer may include a first layer including glass wool, and a second layer including metal.

[0022] The second layer may include aluminum.

[0023] Strength of the reinforcing layer may be greater than strength of the damping layer, and a thickness of the reinforcing layer may be smaller than a thickness of the damping layer.

[0024] Porosity of the reinforcing layer may be lower than porosity of the damping layer, and a heat transfer rate of the reinforcing layer may be greater than a heat transfer rate of the damping layer.

[0025] The damping panel of the present disclosure may further include a mass layer positioned on the other surface facing one surface of the damping layer, in which the mass layer may have a density higher than that of the reinforcing layer.

[0026] The mass layer may have a thickness greater than that of the reinforcing layer.

[0027] Strength of the mass layer may be greater than strength of the reinforcing layer.

[0028] The mass layer may be in contact with the washing tank, or be attached to the washing tank by an adhesive.

[0029] The damping panel may further include a contact surface in contact with the washing tank, and a stepped portion formed on the contact surface and having a step with respect to the contact surface.

[0030] The stepped portion may include a rib groove into which rib formed in the washing tank is inserted.

[0031] The stepped portion may include a contact protrusion that is inserted into a groove formed in the washing tank.

[0032] The damping panel may be disposed on a bottom surface of the washing tank, and a thickness of a rear end of the damping panel may be greater than a thickness of a front end of the damping panel.

[0033] The damping panel may have a size and shape corresponding to one surface of the washing tank.

[0034] The damping panel may have a size smaller than one surface of the washing tank, and a plurality of the damping panels may be disposed on one surface of the washing tank.

[0035] The damping panel may be disposed on each of at least two surfaces of the washing tank, and configurations of the damping panel disposed on the two surfaces may be different from each other.

[0036] The mass layer may be in contact with the washing tank or be attached to the washing tank by an adhesive.

[0037] In order to achieve the above-described objects, there is provided a damping panel in contact with at least one surface of the washing tank to reduce noise generated from the washing tank, the damping panel including: a contact surface in contact with the washing tank; and a stepped portion formed on the contact surface and having a step with respect to the contact surface.

[0038] In order to achieve the above-described objects, according to one embodiment of the present disclosure, there is provided a dishwasher including: a case; a washing tank having at least one open surface and provided inside the case; and a damping panel in contact with at least one surface of the washing tank to reduce noise generated from the washing tank, in which the damping panel includes a contact surface in contact with the washing tank, and a stepped portion formed on the contact surface and having a step with respect to the contact surface.

[0039] The stepped portion may include a rib groove into which rib formed in the washing tank is inserted.

[0040] The stepped portion may include a contact protrusion that is inserted into a groove formed in the washing tank.

[0041] Specific details of other embodiments are included in the detailed description and drawings.

[0042] The damping panel of the present disclosure and the dishwasher including the same have one or more of the following effects.

[0043]

[0044] According to the present disclosure, by disposing the damping panel including the urethane foam including a polyol system and an isocyanate and the reinforcing layer having a density higher than that of the urethane foam in at least one of an interior of a door and a space between the washing tank and the case, noise and vibration can be reduced, a thermal insulation effect can be enhanced, durability of the damping panel can be improved by the reinforcing layer, and flame retardancy can be increased.

[0045] In addition, according to the present disclosure, during manufacturing of the damping panel, the rib grooves corresponding to ribs of one surface of the washing tank or the door are formed, so that the damping panel is closely attached to the one surface of the washing tank or the door without pores, thereby more efficiently reducing noise and vibration generated in the dishwasher.

[0046] In addition, according to the present disclosure, by disposing the damping panel including the urethane foam including the polyol system and the isocyanate, the reinforcing layer having a density higher than that of the urethane foam, and the mass layer having a density higher than that of the reinforcing layer in at least one of the interior of the door and the space between the washing tank and the case, and by attaching the mass layer to the door or the washing tank, deterioration of functions of the urethane foam due to moisture leaking from the washing tank can be prevented, and low-frequency noise, which is a main noise source in the dishwasher and is caused by water drops striking a bottom surface of the washing tank, can be efficiently absorbed.

[0047] Effects of the present disclosure are not limited to those described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0048]

[0049] FIG. 1 is a schematic cross-sectional view illustrating a dishwasher according to one embodiment of the present disclosure.

[0050] FIG. 2 is a view illustrating the lower portion of the dishwasher of FIG. 1.

[0051] FIG. 3a is a perspective view of the dishwasher of FIG. 1 with a case and a part of a door removed.

[0052] FIG. 3b is a perspective view of the dishwasher of FIG. 3a with the door removed and a washing tank and a damping panel separated.

[0053] FIG. 4 is a perspective view of the door and damping panel of the dishwasher of FIG. 3a combined.

[0054] FIG. 5a is a perspective view of a first damping panel attached to an upper surface of the washing tank among the damping panels of FIG. 3a.

[0055] FIG. 5b is a perspective view of a second damping panel attached to a side surface of the washing tank among the damping panel of FIG. 3a.

[0056] FIG. 5c is a perspective view of a fourth damping panel attached to a bottom surface of the washing tank among the damping panels of FIG. 3a.

[0057] FIG. 5d is a perspective view of a third damping panel attached to a rear surface of the washing tank among the damping panels of FIG. 3a.

[0058] FIG. 5e is a perspective view illustrating a fifth damping panel attached to one surface of the door among the damping panels of FIG. 3a.

[0059] FIG. 6 is a diagram illustrating a plurality of damping panels attached to a bottom surface of a washing tank according to another embodiment of the present disclosure.

[0060] FIG. 7 is a cross-sectional view of a damping panel according to one embodiment of the present disclosure.

[0061] FIG. 8 is a cross-sectional view of a damping panel according to another embodiment of the present disclosure.

[0062]

[0063] The advantages and features of the present disclosure, and methods for achieving them, will become apparent with reference to the embodiments described below in detail with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to complete the disclosure and to fully convey the scope of the disclosure to those skilled in the art. The present disclosure is defined solely by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0064] Hereinafter, the present disclosure will be described with reference to drawings illustrating a damping panel and a dishwasher 1 including the same according to one embodiment of the present disclosure.

[0065] Meanwhile, terms indicating directions used in the following description are based on FIG. 3.

[0066] FIG. 1 is a schematic cross-sectional view illustrating a dishwasher according to one embodiment of the present disclosure, and FIG. 2 is a view illustrating the lower portion of the dishwasher of FIG. 1.

[0067] Referring to FIGS. 1 and 2, the dishwasher 1 may include a case 10 forming an exterior thereof, a washing tank 30 provided inside the case 10, a door 11 rotatably installed on the case 10 to open and close the washing tank 30, baskets 12a and 12b provided inside the washing tank 30 to accommodate dishes, spray nozzles 311, 313, 330, and 340 configured to spray washing water, a sump (not illustrated) configured to store washing water, a circulation pump 51 configured to pump the washing water from the sump and supply the washing water to the spray nozzles 311, 313, 330, and 340, a drain pump 52 configured to discharge the washing water from the sump together with contaminants to an outside of the case 10, a vane 400 configured to move within the washing tank 30 and deflect the washing water toward the dishes, and a vane driving device (not illustrated) configured to drive the vane 400.

[0068] The washing tank 30 may be provided within the case 10 with at least one open surface. For example, the washing tank 30 may have a generally box-shaped shape with a front opening for loading and unloading dishes. A front opening 36 (FIG. 3) of the washing tank 30 may be opened and closed by the door 11.

[0069] For example, the washing tank 30 may include an upper surface 31, a bottom surface 35 facing the upper surface 31, a rear surface 32 facing the front opening 36, and left and right surfaces 33 facing each other.

[0070] The upper surface 31 and bottom surface 35 are connected by the rear surface 32, left surface 33, and right surface 34. The washing tank 30 may include a rib 38 to reinforce rigidity and reduce vibration. The rib 38 may be defined as a surface having a step with respect to one surface of the washing tank 30. The rib 38 may be formed by one surface of the washing tank 30 protruding or being recessed. The rib 38 may be formed on the upper surface 31, bottom surface 35, rear surface 32, left surface 33, and right surface 34 of the washing tank 30.

[0071] The door 11 may be formed by combining at least two door frames. One door frame may form the exterior, and the other door frame may form the interior of the door.

[0072] The baskets 12a and 12b may be wire racks made of wire to allow washing water to pass through without pooling. The baskets 12a and 12b may be detachably installed within the washing tank 30. The baskets 12a and 12b may include an upper basket 12a disposed at the upper portion of the washing tank 30 and a lower basket 12b disposed at the lower portion of the washing tank 30.

[0073] The spray nozzles 311, 313, 330, and 340 may spray washing water at high pressure to wash dishes. The spray nozzles 311, 313, 330, and 340 may include an upper rotating nozzle 311 disposed at the upper portion of the washing tank 30, an intermediate rotating nozzle 313 disposed at the center of the washing tank 30, and fixed nozzles 330 and 340 disposed at the lower portion of the washing tank 30.

[0074] The upper rotating nozzle 311 is disposed above the upper basket 12a and may spray washing water downward while being rotated by water pressure. For this purpose, spray holes 312 may be provided at the lower end of the upper rotating nozzle 311. The upper rotating nozzle 311 may directly spray washing water toward dishes stored in the upper basket 12a.

[0075] The intermediate rotating nozzle 313 may be provided between the upper basket 12a and the lower basket 12b and spray the washing water in an up-down direction while being rotated by water pressure. For this purpose, spray holes 314 may be provided at the upper end and lower end of the intermediate rotating nozzle 313. The intermediate rotating nozzle 313 may directly spray the washing water toward dishes stored in the upper basket 12a and the lower basket 12b.

[0076] Unlike the rotating nozzles 311 and 313, the fixed nozzles 330 and 340 are provided not to move and are fixed to one side of the washing tank 30. The fixed nozzles 330 and 340 may be disposed approximately adjacent to a rear surface 32 of the washing tank 30 and spray the washing water toward the front of the washing tank 30. Therefore, the washing water sprayed from the fixed nozzles 330 and 340 may not be directed directly at the dishes.

[0077] The washing water sprayed from the fixed nozzles 330 and 340 may be reflected toward the dishes by the vane 400. The fixed nozzles 330 and 340 may be disposed below the lower basket 12b, and the vane 400 may deflect the washing water sprayed from the fixed nozzles 330 and 340 upward. That is, the washing water sprayed from the fixed nozzles 330 and 340 may be reflected toward the dishes stored in the lower basket 12b by the vane 400.

[0078] The fixed nozzles 330 and 340 may have a plurality of spray holes 331 and 341 arranged in a left-right direction of the washing tank 30.

[0079] The plurality of spray holes 331 and 341 may spray washing water forward. The vane 400 may extend long in the left-right direction of the washing tank 30 to reflect all of the washing water sprayed from the plurality of spray holes 331 and 341 of the fixed nozzles 330 and 340. That is, one longitudinal end of the vane 400 may be adjacent to a left surface 33 of the washing tank 30, and the other longitudinal end of the vane 400 may be adjacent to a right surface 34 of the washing tank 30.

[0080] The vane 400 may perform a linear reciprocating motion along the spraying direction of the washing water sprayed from the fixed nozzles 330 and 340. That is, the vane 400 may linearly reciprocate along the front-rear direction of the washing tank 30.

[0081] Therefore, the linear spray structure including these fixed nozzles 330 and 340 and the vane 400 can wash the entire area of the washing tank 30 without any blind spots. This is different from the case of rotating nozzles, which can only spray the washing water within the range of the rotation radius.

[0082] The fixed nozzles 330 and 340 may include a left fixed nozzle 330 disposed on the left side of the washing tank 30 and a right fixed nozzle 340 disposed on the right side of the washing tank 30.

[0083] The rotating nozzles 311 and 313 and the fixed nozzles 330 and 340 may spray the washing water independently of each other. Furthermore, the left fixed nozzle 330 and the right fixed nozzle 340 may also spray the washing water independently of each other.

[0084] Washing water sprayed from the left fixed nozzle 330 may be reflected only to the left area of the washing tank 30 by the vane 400, and washing water sprayed from the right fixed nozzle 340 may be reflected only to the right area of the washing tank 30 by the vane 400.

[0085] Therefore, the dishwasher 1 can independently separate and wash the left and right sides of the washing tank 30. Of course, unlike the present embodiment, the structure is not necessarily limited to being divided only into left and right portions, and may be further subdivided as necessary.

[0086] Once the dishwashing is complete, a drying process is performed to remove any remaining washing water from the dishes and the washing tank 30.

[0087] FIG. 3a is a perspective view of the dishwasher of FIG. 1 with the case 10 and part of the door removed, FIG. 3b is a perspective view of the dishwasher of FIG. 3a with the door removed and the washing tank 30 and a damping panel 500 separated, and FIG. 4 is a perspective view of the dishwasher of FIG. 3a with the door and the damping panel 500 combined.

[0088] Referring to FIGS. 3 and 4, the dishwasher 1 may further include the damping panel 500 provided to improve damping performance and thermal insulation. The damping panel 500 may be disposed in the dishwasher 1 to effectively reduce vibration and noise that may occur during operation of the dishwasher 1.

[0089] Furthermore, the damping panel 500 may be disposed in the dishwasher 1 to maintain a constant temperature within the heated washing tank 30 during the operation of the dishwasher 1.

[0090] The damping panel 500 may be positioned between the case 10 and the washing tank 30. Specifically, the damping panel 500 may be positioned between the case 10 and the washing tank 30 to surround at least a portion of the washing tank 30.

[0091] More specifically, the damping panel 500 may be disposed between the case 10 and the washing tank 30 to surround at least a portion of the outer surface of the washing tank 30 facing the case 10.

[0092] Preferably, the damping panel 500 may include a first damping panel 501 disposed on an upper surface 31 of the washing tank 30, a second damping panel 502 disposed on the left and right surfaces of the washing tank 30, a third damping panel 503 disposed on a rear surface 32 of the washing tank 30, and a fourth damping panel 504 disposed on a bottom surface 35 of the washing tank 30.

[0093] The damping panel 500 may be disposed inside a door 11. Specifically, the damping panel 500 may further include a fifth damping panel 505 disposed between two door frames of the door 11.

[0094] To ensure that the damping panel 500 is precisely coupled between the case 10 and the washing tank 30 and to enhance adhesion between the damping panel 500 and the washing tank 30, the damping panel 500 may have a shape corresponding to the outer surface shape of the washing tank 30.

[0095] For example, the damping panel 500 may include a contact surface 513 in contact with the washing tank 30, and a stepped portion 511 formed on the contact surface 513 and having a step with respect to the contact surface 513.

[0096] The contact surface 513 of the damping panel 500 is a surface that is attached to the outer surface of the washing tank 30 using an adhesive, or the like, as described below. Furthermore, the contact surface 513 is a surface in contact with the outer surface of the washing tank 30.

[0097] The stepped portion 511 may be a region that is formed on the contact surface 513 and has a step with respect to the contact surface 513. The stepped portion 511 may be formed by a recessed or protruding the contact surface 513. The stepped portion 511 may have a shape that is coupled with a rib 38 formed in the washing tank 30 to ensure the rigidity of the washing tank 30 and prevent vibration and noise of the washing tank 30.

[0098] For example, the stepped portion 511 may include a rib groove 511 into which a rib 38 formed in the washing tank 30 is inserted. The rib groove 511 may be formed by a portion of the contact surface 513 being recessed.

[0099] For another example, the stepped portion 511 may include a contact protrusion (not illustrated) that is inserted into a groove formed in the washing tank 30. The contact protrusion may be formed by a portion protruding from the contact surface 513. The stepped portion 511 preferably forms the rib groove 511 to facilitate manufacture by a mold.

[0100] The damping panel 500 may have a size and shape corresponding to one surface of the washing tank 30. As another example, as illustrated in FIG. 6, the damping panel 500 may be smaller than one surface of the washing tank 30, and a plurality of damping panels 500 may be disposed on one surface of the washing tank 30.

[0101] The damping panels 500 are disposed on at least two surfaces of the washing tank 30, and the configurations of the damping panels 500 disposed on the two surfaces may be different. Of course, the configurations of the damping panels 500 disposed on the two surfaces may be identical.

[0102] The structure of each damping panel 500 is described below.

[0103] FIG. 5a is a perspective view illustrating the first damping panel 501 attached to the upper surface 31 of the washing tank 30 among the damping panels 500 of FIG. 3a.

[0104] Referring to FIG. 5a, the lower surface of the first damping panel 501 attached to the upper surface 31 of the washing tank 30 serves as the contact surface 513. A first wing 519 extending in a direction intersecting the contact surface 513 may be formed at one end or both ends of the first damping panel 501.

[0105] The first wing may be positioned to surround the edge between the upper surface 31 and the left surface of the washing tank 30, or between the upper surface 31 and the right surface of the washing tank 30. The first wing is bent at one end or both ends of the first damping panel 501 and extends downward.

[0106] FIG. 5b is a perspective view illustrating the second damping panel 502 attached to the surface of the washing tank 30 among the damping panels 500 of FIG. 3a.

[0107] The second damping panel 502 is attached to the left surface or right surface of the washing tank 30. One surface of the second damping panel 502 serves as the contact surface 513. The stepped portion 511 is formed on the contact surface 513 of the second damping panel 502. The upper end of the second damping panel 502 is preferably in contact with the first damping panel 501.

[0108] FIG. 5c is a perspective view illustrating the fourth damping panel 504 attached to the bottom surface 35 of the washing tank 30 among the damping panels 500 of FIG. 3a.

[0109] The fourth damping panel 504 is attached to the lower portion of the bottom surface 35 of the washing tank 30. The upper surface of the fourth damping panel 504 serves as the contact surface 513. The stepped portion 511 is formed on the contact surface 513 of the fourth damping panel 504. It is preferable that the upper end of the fourth damping panel 504 is in contact with the second damping panel 502.

[0110] Furthermore, the fourth damping panel 504 may be formed with a drain hole 512 in which a drain port connected to a drain pump 52 is disposed at a central portion thereof. Since the space between the bottom surface 35 of the washing tank 30 and the case 10 is larger at the rear end than at the front end, a thickness W12 of the rear end of the fourth damping panel 504 is preferably thicker than a thickness W11 of the front end of the fourth damping panel 504.

[0111] FIG. 5d is a perspective view illustrating the third damping panel 503 attached to the rear surface 32 of the washing tank 30 among the damping panels 500 of FIG. 3a.

[0112] The third damping panel 503 is attached to the rear surface 32 of the washing tank 30. The front surface of the third damping panel 503 serves as the contact surface 513. A second wing 515 extending in a direction intersecting the contact surface 513 may be formed at one end or both ends of the third damping panel 503.

[0113] The second wing may be positioned to surround the edge between the left surface and the rear surface of the washing tank 30 or the right surface and the rear surface of the washing tank 30. The second wing is bent at one end or both ends of the third damping panel 503 and extends forward.

[0114] FIG. 5e is a perspective view illustrating the fifth damping panel 505 attached to one surface of the door among the damping panels 500 of FIG. 3a.

[0115] The fifth damping panel 505 is positioned inside the door. The rear surface of the fifth damping panel 505 serves as the contact surface 513. The fifth damping panel 505 may have a display hole 516 formed at the center where a display unit is positioned.

[0116] The fifth damping panel 505 may be positioned between two door frames. The edge of the fifth damping panel 505 may have a thickness smaller than that of the center.

[0117] FIG. 6 is a drawing illustrating a state in which a plurality of damping panels 500 are attached to the bottom surface 35 of the washing tank 30 according to another embodiment of the present disclosure.

[0118] Referring to FIG. 6, the damping panel 500 may have a smaller size than one surface of the washing tank 30. The plurality of damping panels 500 may be disposed on one surface of the washing tank 30.

[0119] For example, a plurality of fourth damping panels 504 each having a size smaller than that of the bottom surface 35 of the washing tank 30 may be placed on the bottom surface.

[0120] When the damping panels 500 has a small size and a plurality of damping panels 500 are disposed, there is an advantage in that it is not necessary to form the damping panels 500 to correspond to the shape of one surface of the washing tank 30. That is, the damping panel 500 may be attached only to a region of the washing tank 30 where no ribs are formed, thereby simplifying the manufacturing process.

[0121] The structure of the damping panel 500 will be described in detail below.

[0122] FIG. 7 is a cross-sectional view of the damping panel 500 according to one embodiment of the present disclosure.

[0123] Referring to FIG. 7, the damping panel 500 includes a damping layer 520 and a reinforcing layer 530.

[0124] The damping layer 520 is a material containing a plurality of pores 521 and absorbs noise. The damping layer 520 may include a contact surface 513 and may be in contact with one surface of the door or one surface of the washing tank 30 or may be adhered to another material.

[0125] For example, the damping layer 520 may include at least one of a rigid polyurethane foam, a flexible polyurethane foam, and a semi-rigid polyurethane foam. Preferably, the damping layer 520 uses the semi-rigid polyurethane foam, taking into account strength and absorption rate.

[0126] The polyurethane foam may have a density of 150 kg / m3 or more and 300 kg / m3 or less.

[0127] Furthermore, the polyurethane foam may have a damping ratio of 0.16 or more and 0.2 or less. Specifically, the polyurethane foam may have a damping ratio of 0.16 or more and 0.2 or less at a temperature of 25?C. Additionally, the polyurethane foam may have a thermal conductivity of 0.6 W / m?K or less.

[0128] The polyurethane foam may be produced by a foaming reaction of a polyol system and an isocyanate.

[0129] The mixing ratio of the polyol system and the isocyanate may be 100:40 to 100:80. The polyol system may include a polyol composition. The polyol composition may include a polyether polyol. Specifically, the polyol composition may include a polyether polyol having two or more and eight or less functional groups, depending on the initiator.

[0130] The polyol composition may further include a polymer polyol. Specifically, the polyol composition may further include a dispersion-type polymer polyol copolymerized with a styrene monomer and an acrylonitrile monomer.

[0131] The polyether polyol may have a content of 50 wt% or more and 100 wt% or less. The disperse polymer polyol may have a content of 0 wt% or more and 50 wt% or less.

[0132] The polyol system may further include an additive.

[0133] The additive may include a chain extender. The chain extender may include at least one of a short chain alcohol having two or more and six or less function groups and a short chain amine having two or more and six or less functional groups. As an example, the chain extender may include a short chain alcohol having two to six functional groups and a molecular weight of 60 to 150 g / mol. The short chain alcohol may include ethylene glycol, glycerine, butane diol, and the like. The chain extender serves to increase the strength of the polyurethane foam.

[0134] The additive may further include at least one of a physical blowing agent and a chemical blowing agent. Specifically, the additive may further include at least one of a low-boiling physical blowing agent and a low-boiling chemical blowing agent. For example, the low-boiling physical blowing agent may include cyclopentane, 245fa, HCFC141b, or the like.

[0135] Preferably, the chemical blowing agent may include water (H2O). When water is used as the chemical blowing agent, the water may have a content of 1.0 wt% or more and 5.0 wt% or less based on 100 wt% of the polyol composition.

[0136] The additive may further include a catalyst. The catalyst may be used to control reactivity. Preferably, the catalyst may include an amine-based catalyst. The catalyst may have a content of 0.1 wt% or more and 5.0 wt% or less based on 100 wt% of the polyol composition.

[0137] The additive may further include a surfactant. The surfactant may be used to control and stabilize the size of the cell, which may be considered the skeleton of polyurethane foam. Preferably, the surfactant may include a silicone surfactant. When using a silicone surfactant as the surfactant, the silicone surfactant may have a content of 0.5 wt% or more and 5.0 wt% or less based on 100 wt% of the polyol composition.

[0138] The additive may further include a cross-linker. The cross-linker may have a content of 0.5 wt% or more and 10 wt% or less based on 100 wt% of the polyol composition.

[0139] The additive may further include other additives. The other additives may have a content of 0 wt% or more and 10.0 wt% or less based on 100 wt% of the polyol composition.

[0140] The other additives may include a flame retardant. The flame retardant may include at least one of a phosphorus-based flame retardant, a phosphate ester flame retardant, and a halogen-based flame retardant. For example, the phosphorus-based flame retardant may include TCPP, TPP, or the like.

[0141] Other additives may further include a pigment.

[0142] Other additives may further include an inorganic filler. The inorganic filler serves to increase the density of the polyurethane foam. For example, the inorganic filler may include calcium carbonate (CaCO3), talc, or the like.

[0143] In this way, the additives may include at least one of the blowing agent, the chain extender, the catalyst, the surfactant, the flame retardant, the pigment, the inorganic filler, and the cross-linker.

[0144] The isocyanate may have a specific gravity of 1.21 or more and 1.22 or less. The isocyanate may include polymeric MDI as a main component. The isocyanate may have a content of 40 wt% or more and 80 wt% or less based on 100 wt% of the polyol system.

[0145] The reinforcing layer 530 is positioned on the other surface facing the contact surface 513 of the damping layer 520. The reinforcing layer 530 may be in contact with the other surface of the damping layer 520 and have a shape corresponding to that of the damping layer 520.

[0146] The reinforcing layer 530 reinforces the strength and / or flame retardancy of the damping layer 520, which has high porosity. The reinforcing layer 530 may have a density higher than that of the damping layer 520. In addition, the strength of the reinforcing layer 530 may be greater than that of the damping layer 520. A thickness W2 of the reinforcing layer 530 may be smaller than a thickness W1 of the damping layer 520.

[0147] In addition, the porosity of the reinforcing layer 530 may be lower than that of the damping layer 520. The heat transfer rate of the reinforcing layer 530 may be greater than that of the damping layer 520.

[0148] For example, the reinforcing layer 530 may include at least one of glass, glass wool, and metal. The metal may include aluminum, iron, copper, gold, tin, and alloys thereof.

[0149] Furthermore, the reinforcing layer 530 may have a multilayer structure. Specifically, the reinforcing layer 530 may include a first layer 531 including glass wool and a second layer 532 including metal. The first layer 531 is positioned between the damping layer 520 and the second layer 532.

[0150] FIG. 8 is a cross-sectional view of a damping panel 500 according to another embodiment of the present disclosure.

[0151] Referring to FIG. 8, the damping panel 500 according to another embodiment (second embodiment) of the present disclosure differs from that of the embodiment of FIG. 7 (first embodiment) in that it further includes a mass layer 540. In the following description of the second embodiment, descriptions of components identical to those of the first embodiment will be omitted, and components without separate description will be considered identical to those of the first embodiment.

[0152] The damping panel 500 according to the second embodiment further includes the mass layer 540. In this case, the contact surface 513 of the damping panel 500 is formed on one surface of the mass layer 540. Therefore, one surface of the mass layer 540 may be in contact with or be adhered to one surface of the washing tank.

[0153] The mass layer 540 is positioned on one surface of the damping layer 520, and the reinforcing layer 530 is positioned on the other surface of the damping layer 520. That is, the damping layer 520 is positioned between the mass layer 540 and the reinforcing layer 530.

[0154] The mass layer 540 reinforces the strength of the damping layer 520 or prevents degradation of the performance of the damping layer 520 due to water or other substances. In addition, the mass layer 540 reduces low-frequency noise caused by impact of falling water on the bottom surface 35 of the washing tank 30, which is not sufficiently absorbed by the damping layer 520.

[0155] The mass layer 540 may have a density higher than that of the reinforcing layer 530. The mass layer 540 may have a thickness W3 greater than that of the reinforcing layer 530. The mass layer 540 may have a thickness that does not deteriorate insulation performance. The strength of the mass layer 540 may be greater than that of the reinforcing layer 530.

[0156] For example, the mass layer 540 may be made of a high-density material. Specifically, the mass layer 540 may include metal.

[0157] The mass layer 540 may be in contact with the washing tank 30 or may be attached to the washing tank 30 using an adhesive. Specifically, the mass layer 540 may be secured to one surface of the washing tank 30 or one surface of the door using butyl rubber, double-sided tape, welding, or a separate structural fastener (rivet, bolting, clip, or the like).

[0158] While the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. Various modifications may be made by those skilled in the art without departing from the scope of the present disclosure as claimed in the claims. Such modifications should not be understood individually from the technical spirit or scope of the present disclosure.

[0159] The present disclosure may be implemented in various ways, and the scope of the rights granted herein is not limited to the embodiments described above. Therefore, when a modified embodiment includes elements of the claims of the present disclosure, it should be considered within the scope of the present disclosure.

[0160] The embodiments or other embodiments of the present disclosure described above are not mutually exclusive or distinct. The respective configurations or functions of the embodiments or other embodiments of the present disclosure described above may be combined or used in combination.

[0161] For example, this means that configuration A described in a specific embodiment and / or drawing may be combined with configuration B described in another embodiment and / or drawing. In other words, even when a combination between components is not directly described, this means that combination is possible, except where combination is described as impossible.

[0162] The above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all changes within the scope of equivalency of the present disclosure are intended to be included within the scope of the present disclosure.

[0163]

[0164] [List of Reference numerals]

[0165] 1: dishwasher 30: washing tank

[0166] 500: damping panel 520: damping layer

[0167] 530: reinforcing layer 540: mass layer

Claims

1.A damping panel comprising:a damping layer including a plurality of pores and absorbing noise; anda reinforcing layer positioned on one surface of the damping layer and including a density higher than that of the damping layer.2.The damping panel of claim 1, wherein the damping layer includes at least one of a rigid polyurethane foam, a flexible polyurethane foam, and a semi-rigid polyurethane foam.3.The damping panel of claim 1, wherein the reinforcing layer includes at least one of glass wool and metal.4.The damping panel of claim 1, wherein the reinforcing layer comprises:a first layer including glass wool, anda second layer including metal.5.The damping panel of claim 4, wherein the second layer includes aluminum.6.The damping panel of claim 1, wherein strength of the reinforcing layer is greater than strength of the damping layer, anda thickness of the reinforcing layer is smaller than a thickness of the damping layer.7.The damping panel of claim 1, wherein porosity of the reinforcing layer is lower than porosity of the damping layer, anda heat transfer rate of the reinforcing layer is greater than a heat transfer rate of the damping layer.8.The damping panel of claim 1, further comprising a mass layer positioned on the other surface facing one surface of the damping layer,wherein the mass layer has a density higher than that of the reinforcing layer.9.The damping panel of claim 8, wherein the mass layer has a thickness greater than that of the reinforcing layer.10.The damping panel of claim 8, wherein strength of the mass layer is greater than strength of the reinforcing layer.11.The damping panel of claim 1, further comprising:a contact surface in contact with the washing tank; anda stepped portion formed on the contact surface and having a step with respect to the contact surface.12.The damping panel of claim 11, wherein the stepped portion includes a rib groove into which rib formed in the washing tank is inserted.13.The damping panel of claim 11, wherein the stepped portion includes a contact protrusion that is inserted into a groove formed in the washing tank.14.The damping panel of claim 11, wherein the damping panel is disposed on a bottom surface of the washing tank, anda thickness of a rear end of the damping panel is greater than a thickness of a front end of the damping panel.15.The damping panel of claim 1, wherein the damping panel has a size and shape corresponding to one surface of the washing tank.16.The damping panel of claim 11, wherein the damping panel has a size smaller than one surface of the washing tank, anda plurality of the damping panels are disposed on one surface of the washing tank.17.The damping panel of claim 11, wherein the damping panel is disposed on each of at least two surfaces of the washing tank, andconfigurations of the damping panel disposed on the two surfaces are different from each other.18.The damping panel of claim 8, wherein the mass layer is in contact with the washing tank or is attached to the washing tank by an adhesive.19.A dishwasher comprising:a case;a washing tank having at least one open surface and provided inside the case; anda damping panel in contact with at least one surface of the washing tank to reduce noise generated from the washing tank,wherein the damping panel includesa contact surface in contact with the washing tank, anda stepped portion formed on the contact surface and having a step with respect to the contact surface.20.The dishwasher of claim 19, wherein the stepped portion includes a rib groove into which rib formed in the washing tank is inserted.

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