KR20190017452A - Dishwasher - Google Patents

Abstract

Disclosed is a dishwasher having an advanced structure so as to improve a vibration damping property and heat insulation. The dishwasher comprises: a main body; a washing tank having at least one opened surface, and provided inside the main body; and a urethane foam arranged between the main body and the washing tank, and generated by the foaming reaction of a polyol system and isocyanate. Here, the urethane foam can have a density of 150-300 kg/m^3.

Description

Dishwasher {DISHWASHER}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dishwasher, and more particularly, to a dishwasher having an improved structure for improving vibration damping property and heat insulating property.

The dishwasher is a device that automatically cleans food waste from dishes using detergent and washing water.

The dishwasher includes a main body in which a washing tub is provided, a basket for storing dishes, a sump for storing washing water, a spray nozzle for spraying wash water, and a pump for pumping washing water of the sump to the spray nozzle.

When the dishwasher is operated, a considerable level of noise and vibration occurs. In order to reduce such noise and vibration, an asphalt damping sheet is generally attached to the outer surface of the washing tub. However, at least one drying / cooling process is required to attach the asphalt damping sheet to the outer surface of the washing tub. Further, since the outer surface of the cleaning tank is not uniform, hard adhesion of the asphalt damping sheet is difficult to expect. In addition, since the asphalt damping sheet has a relatively large density, the thermal mass of the dishwasher can be increased. This can lead to an increase in power consumption.

One aspect of the present invention provides a dishwasher having an improved structure for reducing noise and vibration.

Another aspect of the present invention provides a dishwasher having an improved structure to improve the heat insulation effect.

Another aspect of the present invention provides a dishwasher having an improved structure that can be implemented through a simple manufacturing process.

Another aspect of the present invention provides a dishwasher having an improved structure for improving energy efficiency.

The dishwasher according to the present invention includes a main body, a cleaning tank provided inside the main body and having at least one open side, and a cleaning unit disposed between the main body and the cleaning tank, the cleaning unit including a polyol system and an isocyanate, And the urethane foam may have a density of 150 kg / m ³ or more and 300 kg / m ³ or less.

 The mixing ratio of the polyol system and the isocyanate may be 100: 40 to 100: 80.

The urethane foam may have a damping ratio of 0.16 or more and 0.2 or less.

The urethane foam may have a thermal conductivity of 0.6 W / m · K or less.

The polyol system may comprise a polyether polyol having from 2 to 8 functional groups.

The polyol system may further include a dispersion type polymer polyol in which a styrene monomer and an acrylonitrile monomer are copolymerized.

The isocyanate may have a specific gravity of 1.21 to 1.22.

The polyol system further comprises a chain extender, wherein the chain extender is selected from the group consisting of short chain alcohols having 2 to 6 functional groups and short chain alcohols having 2 to 6 functional groups, Amines (short chain amines).

The polyol system may further comprise at least one of a physical blowing agent and a chemical blowing agent.

The urethane foam may be arranged to surround at least a part of the washing tub.

The dishwasher according to an aspect of the present invention may further include a door rotatably installed on the main body to open and close at least one open side of the washing tub, and the urethane foam may be further disposed inside the door.

A dishwasher according to an aspect of the present invention includes a main body, a cleaning tank provided on the inside of the main body, having at least one surface opened, a door rotatably installed on the main body to open and close at least one opened surface of the cleaning tank, And a urethane foam disposed in at least one of the interior of the door and the body and the washing tank and produced by a foaming reaction of a polyol system and isocyanate, m ³ to 300 kg / m ³ , a damping ratio of 0.16 to less than 0.2, and a thermal conductivity of 0.6 W / m · K or less.

The washing tub may include an outer wall facing the body, and the urethane foam may be disposed to surround at least a part of the outer wall of the washing tub.

The mixing ratio of the polyol system and the isocyanate may be 100: 40 to 100: 80.

The polyol system may comprise a polyether polyol having from 2 to 8 functional groups.

The polyol system may further include a dispersion type polymer polyol in which a styrene monomer and an acrylonitrile monomer are copolymerized.

The isocyanate may have a specific gravity of 1.21 to 1.22.

The polyol system further comprises an additive, wherein the additive is selected from the group consisting of a blowing agent, a chain extender, a catalyst, a surfactant, a flame retardant, a pigment, an inorganic filler, and a cross linker And may include at least one.

The chain extender may include at least one of a short chain alcohol having 2 to 6 functional groups and a short chain amine having 2 to 6 functional groups.

By disposing the urethane foam composed of the polyol system and the isocyanate in at least one of the inside of the door and between the washing tank and the main body, noise and vibration can be reduced and a heat insulating effect can be expected.

The process of foaming the urethane foam to the dishwasher is easier and simpler than the process of attaching the asphalt damping sheet to the dishwasher, thus simplifying the manufacturing process.

Urethane foam has considerably smaller density than the asphalt damping sheet, so it can be expected to reduce power consumption of the dishwasher.

1 is a schematic sectional view showing a dishwasher according to an embodiment of the present invention
2 is a bottom view of the dishwasher of Fig. 1
3 is a graph showing the characteristics of a urethane foam provided in a dishwasher according to an embodiment of the present invention.
FIG. 4 is a graph showing the results of measurement of a polyol system used in the production of urethane foam and a table showing the amount of isocyanate used in the urethane foam of the dishwasher according to an embodiment of the present invention.
5 is a view schematically showing the process of foaming a urethane foam between a washing tank and a main body in a dishwasher according to an embodiment of the present invention.
6 is a view schematically showing a process of foaming a urethane foam in a door of a dishwasher according to an embodiment of the present invention
7 is a view schematically showing a test procedure for checking the vibration damping performance of the urethane foam provided in the dish washer according to an embodiment of the present invention.
Figure 8 is a table showing the relationship of density and damping ratio of various specimens
Figure 9 is a table showing the conditions for the various specimens of Figure 8;
10 is a graph showing the relationship between the mixing ratio of various specimens and the damping ratio
11 is a table showing the relationship of the density, mixing ratio and damping ratio of various specimens
12 is a view schematically showing a process of foaming a urethane foam between a washing tank and a main body in a dishwasher according to another embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The term "front end", "rear end", "upper", "lower", "upper" and "lower end" used in the following description are defined with reference to the drawings, And the position is not limited.

FIG. 1 is a schematic cross-sectional view illustrating a dishwasher according to an embodiment of the present invention, and FIG. 2 is a bottom view of the dishwasher of FIG. 1.

1 and 2, the dishwasher 1 includes a main body 10 forming an outer appearance, a washing tub 30 provided inside the main body 10, (12a, 12b) provided in the washing tank (30) for storing the tableware, spray nozzles (311, 313, 330, 340) for spraying the wash water, A circulation pump 51 for pumping washing water of the sump to supply the washing water to the spraying nozzles 311, 313, 330 and 340, a drain pump for discharging the washing water of the sump to the outside of the main body 10 together with the dirt, A vane 400 for moving the inside of the washing tub 30 and reflecting the washing water to the table side and a vane driving device for driving the vane 400.

The washing tub 30 may be provided inside the body 10 to have at least one open face.

As an example, the washing tub 30 may have a substantially box shape opened frontward so that the tableware can be inserted and removed. The front opening of the washing tub 30 can be opened and closed by the door 11. [ The washing tub 30 may have an inner upper surface 31, an inner rear surface 32, an inner seating surface 33, an inner side surface 34 and a bottom surface 35. The washing tub 30 has an outer upper surface (not shown) corresponding to the inner upper surface 31, the inner rear surface 32, the inner side surface 33, the inner side surface 34 and the bottom surface 35, (Not shown), an outer side surface (not shown), an outer side surface 34a and an outer bottom surface 35a of the cleaning tank 30. The door 11 is provided with at least an opened And may be rotatably installed on the main body 10 to open and close one surface. The door 11 may include a first door frame 11a (see FIG. 6) and a second door frame 11b (see FIG. 6). The first door frame 11a and the second door frame 11b can be coupled to each other to form an outer appearance of the door 11. [

The baskets 12a and 12b may be wire racks made of wires so that the washing water can pass without passing. The baskets 12a and 12b may be detachably installed in the inside of the washing tub 30. The baskets 12a and 12b may include an upper basket 12a disposed at an upper portion of the washing tub 30 and a lower basket 12b disposed at a lower portion of the washing tub 30. [

The spray nozzles 311, 313, 330 and 340 can wash the dishes by spraying the wash water at a high pressure. The spray nozzles 311, 313, 330 and 340 include an upper rotary nozzle 311 provided at an upper portion of the washing tub 30, an intermediate rotary nozzle 313 provided at the center of the washing tub 30, And may include fixed nozzles 330, 340.

The upper rotating nozzle 311 is provided on the upper side of the upper basket 12a and can discharge the washing water downward while being rotated by the water pressure. For this purpose, injection holes 312 may be provided at the lower end of the upper rotary nozzle 311. The upper rotating nozzle 311 can spray the washing water directly toward the tableware housed in the upper basket 12a.

The intermediate rotary nozzle 313 is provided between the upper basket 12a and the lower basket 12b and is capable of spraying the washing water in the vertical direction while rotating by the water pressure. For this, injection holes 314 may be provided at the upper and lower ends of the intermediate rotary nozzle 313. The intermediate rotary nozzle 313 can spray the washing water directly toward the tableware housed in the upper basket 12a and the lower basket 12b.

The fixed nozzles 330 and 340 are provided so as not to move unlike the rotating nozzles 311 and 313 and are fixed to one side of the washing tub 30. The fixed nozzles 330 and 340 can be disposed adjacent to the inner rear surface 32 of the washing tub 30 to spray the washing water toward the front of the washing tub 30. Therefore, the washing water sprayed from the fixed nozzles 330, 340 may not directly direct to the tableware.

The washing water sprayed from the fixed nozzles 330 and 340 can be reflected to the tableware side by the vane 400. The fixed nozzles 330 and 340 are disposed under the lower basket 12b and the vane 400 can reflect the washing water sprayed from the fixed nozzles 330 and 340 upward. That is, the washing water injected from the fixed nozzles 330 and 340 can be reflected by the vane 400 toward the tableware accommodated in the lower basket 12b.

The fixed nozzles 330 and 340 may have a plurality of ejection holes 331 and 341 arranged in the left-right direction of the washing tub 30, respectively. The plurality of ejection holes (331, 341) can eject wash water toward the front side.

The vane 400 can be elongated in the left and right direction of the washing tub 30 so as to reflect all the washing water injected from the plurality of injection holes 331 and 341 of the fixed nozzles 330 and 340. That is, one longitudinal end of the vane 400 is adjacent to the inner side surface 33 of the washing tub 30 and the other longitudinal end of the vane 400 is adjacent to the inner side surface 34 of the washing tub 30 .

The vanes 400 can reciprocate linearly along the spraying direction of the washing water sprayed from the fixed nozzles 330 and 340. That is, the vane 400 can linearly reciprocate along the front-back direction of the washing tub 30. [

Accordingly, the linear injection structure including the fixed nozzles 330, 340 and the vane 400 can clean the entire area of the washing tub 30 without a blind spot. It is different from the case where the washing water can be sprayed only within the range of the turning radius in the case of the rotating nozzles.

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

The rotary nozzles 311 and 313 and the fixed nozzles 330 and 340 can spray wash water independently of each other. Furthermore, the left fixed nozzle 330 and the right fixed nozzle 340 can also independently spray the washing water.

The washing water injected from the left fixed nozzle 330 is reflected only to the left area of the washing tub 30 by the vane 400 and the washing water injected from the right fixed nozzle 340 is reflected by the washing tub 30 by the vane 400, As shown in FIG.

Therefore, the dishwasher 1 can independently clean the left and right sides of the washing tub 30 separately. Needless to say, unlike the present embodiment, it is needless to say that it is not necessarily divided only into the left and right sides, but it is possible to divide it into further subdivisions according to necessity.

When the washing of the tableware is completed, a drying process is performed to remove the washing water remaining in the dishware and the washing tub 30.

The dishwasher 1 may further include a urethane foam 500 provided to improve vibration damping property and heat insulating property. That is, the urethane foam 500 can be disposed in the dishwasher 1 to effectively reduce vibration and noise that may occur during the operation of the dishwasher 1. The urethane foam 500 may be disposed in the dishwasher 1 such that the inside of the heated washing tub 30 is kept at a constant temperature during the operation of the dishwasher 1.

The urethane foam 500 may be disposed between the main body 10 and the washing tub 30. Specifically, the urethane foam 500 may be disposed between the main body 10 and the washing tub 30 so as to enclose at least a part of the washing tub 30. In other words, the urethane foam 500 can be disposed between the main body 10 and the washing tub 30 so as to cover at least a part of the outer wall of the washing tub 30 facing the main body 10. Preferably, the urethane foam 500 is installed in the main body 10 and the washing tank (not shown) so as to enclose the outer upper surface, the outer back surface, the outer seating surface, the outer right surface 34a and the outer bottom surface 35a of the washing tub 30 30, respectively. As an example, the urethane foam 500 may be disposed between the main body 10 and the washing tub 30 through spraying, using an adhesive, through lamination, or in conjunction with reactive injection molding. Preferably, the urethane foam 500 can be foamed between the main body 10 and the washing tub 30. [

The urethane foam 500 may be disposed inside the door 11. That is, the urethane foam 500 may be disposed between the first door frame 11a and the second door frame 11b.

The urethane foam 500 may be disposed in at least one of the interior of the door 11 and the body 10 and the washing tub 30. [ Preferably, the urethane foam 500 may be disposed both inside the door 11 and between the main body 10 and the washing tub 30. [

3 is a table showing characteristics of a urethane foam provided in a dishwasher according to an embodiment of the present invention.

The urethane foam 500 may have a density of 150 kg / m ³ or more and 300 kg / m ³ or less.

Also, the urethane foam 500 may have a damping ratio of 0.16 or more and 0.2 or less. 3, the urethane foam 500 may have a damping ratio of 0.16 or more and 0.2 or less at a temperature of 25 占 폚.

In addition, the urethane foam 500 may have a thermal conductivity of 0.6 W / m · K or less. That is, the urethane foam 500 may have a thermal conductivity of 600 mW / m · K or less as shown in FIG.

FIG. 4 is a table showing the amount of polyol system and isocyanate used in urethane foam production in a urethane foam provided in a dishwasher according to an embodiment of the present invention.

The urethane foam 500 may be produced by a foaming reaction of a polyol system and an isocyanate.

The mixing ratio of the polyol system and the isocyanate may be 100: 40 to 100: 80.

The polyol system may comprise a polyol composition.

The polyol composition may comprise a polyether polyol. Specifically, the polyol composition may include a polyether polyol having 2 to 8 functional groups, depending on the initiator.

The polyol composition may further comprise a polymer polyol. Specifically, the polyol composition may further include a dispersion type polymer polyol in which a styrene monomer and an acrylonitrile monomer are copolymerized.

The polyether polyol may have a weight percentage of from 50 up to 100. The dispersed polymer polyol may have a weight percentage of 0 or more and 50 or less.

The polyol system may further comprise additives.

The additive may include a chain extender. The chain extender may include at least one of a short chain alcohol having 2 to 6 functional groups and a short chain alcohol having 2 to 6 functional groups. As an example, the chain extender may comprise from 2 to 6 functional groups and a short chain alcohol having a molecular weight of from 60 g / mol to 150 g / mol. The short chain alcohol may include ethylene glycol, glycerine, butane diol, and the like. The chain extender acts to increase the strength of the urethane foam 500.

The additive may further comprise 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 chemical blowing agent. As an example, the low boiling point physical blowing agent may include cyclopentane, 245fa, HCFC 141b, and the like.

Preferably, the chemical blowing agent may include water (H ₂ 0). When water is used as the chemical foaming agent, water may have a weight percentage of 1.0 to 5.0 based on 100 wt% of the polyol composition.

The additive may further comprise a catalyst. Catalysts can be used for reactivity control. Preferably, the catalyst may comprise an amine-based catalyst. The catalyst may have a weight percentage of 0.1 to 5.0 based on 100 wt% of the polyol composition.

The additive may further comprise a surfactant. The surfactant may be used to control and stabilize the cell size, which may be referred to as the skeleton of the urethane foam 500. Preferably, the surfactant may comprise a silicone surfactant. When a silicone surfactant is used as the surfactant, the silicone surfactant may have a weight percentage of 0.5 to 5.0 based on 100 wt% of the polyol composition.

The additive may further comprise a cross-linker. The crosslinking agent may have a weight percentage of 0.5 to 10 based on 100 wt% of the polyol composition.

The additive may further include other additives. Other additives may have a weight percentage of 0 to 10.0 based on 100 wt% of the polyol composition.

Other additives may include flame retardants. The flame retardant may include at least one of phosphorus-based flame retardant, phosphate ester flame retardant, and halogen-based flame retardant. As an example, the phosphorus flame retardant may include TCPP, TPP, and the like.

Other additives may further comprise pigments.

Other additives may further include inorganic fillers. The inorganic filler serves to increase the density of the urethane foam 500. As an example, the inorganic filler may include calcium carbonate (CaCO ₃ ), talc, and the like.

As such, the additive may include at least one of a foaming agent, a chain extender, a catalyst, a surfactant, a flame retardant, a pigment, an inorganic filler, and a crosslinking agent.

The isocyanate may have a specific gravity of 1.21 or more and 1.22 or less. The isocyanate may comprise polymeric MDI as a major component. The isocyanate may have a weight percentage of from 40 to 80 based on 100% by weight of the polyol system.

5 is a view schematically showing a process of foaming a urethane foam between a washing tank and a main body in a dishwasher according to an embodiment of the present invention. As described above, the washing tub 30 may include at least one open face. 5, the case where the cleaning tank 30 has one open side will be mainly described.

As shown in Fig. 5 (a), a cleaning tank 30 having one open side is prepared. At least one opening (50) may be formed in the washing tank (30). The washing water or dirt inside the washing tub 30 may be introduced into the drain pump 52 or the like disposed under the washing tub 30 through at least one opening 50.

As shown in FIG. 5 (b), at least one opening 50 formed in the washing tub 30 is sealed. That is, at least one opening 50 is closed with the sealing member 70. The reason for sealing the at least one opening (50) is to prevent the urethane foam liquid from flowing into the washing tub (30). As an example, the sealing member 70 may comprise a tape.

A plug 80 is inserted into the washing tub 30, as shown in Fig. 5 (c). It is possible to prevent the shape of the washing tub 30 from being deformed during the process of foaming the urethane foam 500 by inserting the plug 80 into the inside of the washing tub 30. [

The cleaning tank 30 into which the plug 80 is inserted is inserted into the foaming mold 90, as shown in Fig. 5 (d). At this time, the temperatures of the foam metal mold 90 and the plug 80 are kept at 40 占 폚 or higher and 50 占 폚 or lower. After the washing tank 30 is inserted into the foam metal mold 90, the urea foamed liquid is discharged to the outside of the washing tub 30 at a high pressure by a predetermined amount using the injection head 601 of the foamer 600. When the discharge of the urethane foam liquid is completed, the foam metal mold 90 is covered with the foam mold lid to cure the urethane foam liquid.

5 (e), after the lapse of the curing time of about 5 minutes to 10 minutes, the foamed mold lead is separated, and the washing tank 30 in which the urethane foam 500 is foamed is removed from the foaming mold 90 Separate.

As shown in FIG. 5 (f), the washing tank 30 having the urethane foam 500 foamed on the outer wall is engaged with the main body 10. At this time, the urethane foam 500 may be provided with at least one opening 50a corresponding to at least one opening 50 formed in the washing tub 30. [

5D, the urethane foam liquid is injected by using a plurality of injection heads 601. However, it is also possible to inject the urethane foam liquid by using one injection head 601. FIG. 5D shows a case where a urethane foamed liquid is injected from the upper side of the foam metal mold 90 by using a plurality of injection heads 601. However, It is also possible to inject liquid.

FIG. 6 is a view schematically showing a process of foaming a urethane foam in a door of a dishwasher according to an embodiment of the present invention. Referring to FIG.

The first door frame 11a is inserted into the foaming mold 92 as shown in Fig. Specifically, the first door frame 11a is inserted into the first blowing mold 92a. The first door frame 11a is inserted into the first bubbling metal mold 92a and then the urethane foam liquid is supplied to one side of the first door frame 11a by using the injection head 601 of the bubbler 600, . After the discharge of the urethane foamed liquid is completed, the first foamed metal mold 92a is covered with the second foamed metal mold 92b to cure the urethane foamed liquid. When the urethane foam liquid is cured, the second foam metal mold 92b is opened to separate the first door frame 11a from which the urethane foam 500 is foamed, from the foam metal mold 92. [

The first door frame 11a having the urethane foam 500 foamed on one side thereof is engaged with the second door frame 11b as shown in FIG. 6 (b). Concretely, the first door frame 11a and the second door frame 11b are engaged so that the urethane foam 500 is positioned between the first door frame 11a and the second door frame 11b.

7 is a schematic view illustrating a test procedure for checking the vibration damping performance of a urethane foam provided in a dishwasher according to an embodiment of the present invention.

As shown in Fig. 7, a test steel plate (hereinafter referred to as a specimen 700) having a urethane foam foamed is prepared to confirm the vibration damping performance of the urethane foam. The process of manufacturing the test piece 700 is as follows. Place a steel plate made of STS430 on a mold maintained at a temperature of about 45 캜 and preheat it. The steel plate size is about 12 cm X 3 cm, and a tape is attached to the area corresponding to about 2 cm from the edge of the long side and the short side to mask it. Thereafter, a polyol system (A) (see FIG. 4) prepared beforehand and isocyanate (B) (see FIG. 4) are respectively weighed in a measuring cup. The weighed polyol system (A) and isocyanate (B) are poured into empty cups, followed by rapid agitation for about 5 seconds. When the high-speed stirring is completed, the urethane foamed liquid produced by mixing the polyol system (A) and the isocyanate (B) is poured onto the preheated steel plate. At this time, the density of the urethane foam is determined by the amount of the urethane foam liquid poured onto the iron plate. After the mold is closed and the curing time is about 5 minutes, the specimen 700 is taken. After the specimen 700 is cut to a desired size, it is used for the vibration damping performance test of the urethane foam.

The prepared specimen 700 is fixed to the specimen fixing member 820. Thereafter, a shock is applied to the specimen 700 using the striking member 810. At this time, the vibration generated in the test piece 700 is measured by using the vibration measuring device 830, and the result is analyzed by using the analyzing device 840. [ The analysis result can be confirmed using the output device 850.

FIG. 8 is a table showing the relationship between density and damping ratio of various specimens, and FIG. 9 is a table showing conditions for various specimens of FIG. In FIG. 9, OHV represents OH Value or Hydroxyl Value. That is, OHV is defined as the number of mg of KOH required to neutralize the acetic acid bound to the acetyl compound obtained from 1 g of polyol. In Fig. 9, numerical values of IA, IB, IC, AD, ID, and IE are expressed in mass%.

Fig. 8 shows a specimen (hereinafter referred to as Comparative Example 1) having SUS formed thereon (hereinafter referred to as Comparative Example 1), a specimen having asphalt adhered to SUS The density and the damping ratio of the embodiment).

The conditions for the specimen used in the experiment centered on FIG. 9 will be described as follows. The first polyol has an OHV of 56 mg KOH / g, has a viscosity of 500 cps / 25 ° C, the second polyol has an OHV of 34 mg KOH / g and has a viscosity of 750 cps / 25 ° C. The third polyol has an OHV of 20 mg KOH / g, has a viscosity of 6,000 cps / 25 ° C, the fourth polyol has an OHV of 230 mg KOH / g and has a viscosity of 400 cps / 25 ° C. The fifth polyol has an OHV of 32 mg KOH / g, has a viscosity of 2,000 cps / 25 ° C, the sixth polyol has an OHV of 28 mg KOH / g and has a viscosity of 1,500 cps / 25 ° C. The seventh polyol has an OHV of 28 mg KOH / g, has a viscosity of 2,000 cps / 25 ° C, the eighth polyol has an OHV of 32 mg KOH / g and has a viscosity of 1,500 cps / 25 ° C. Here, the third polyol is a dispersed polymer polyol.

General chain DMEA (Dimethylethanolamine), DEOA (Diethanol amine) and MEG (Mono Ethylene Glycol) were used as the chain extender.

L-3002 of Momentive and B8719 and B4113 of Evonik were used as the silicone surfactant.

The catalyst was Evonik's 33LV, Momentive's A-1, and Huntsman's ZR50.

The foaming agent used water as a chemical foaming agent.

The isocyanate, namely MDI, was CG29N from Cosmonate.

Comparative Example 1 has a damping ratio of 0.053. It can be seen that the comparative example 1 has a smaller damping ratio than that of the comparative example 2 and the plurality of embodiments, and thus the vibration damping performance is lower than that of the comparative example 2 and the plurality of embodiments.

Comparative Example 2 has a relatively large damping ratio of 0.177 but a very high density of 1,480 Kg / m ³ . Therefore, in the case of Comparative Example 2, although the vibration damping performance is relatively excellent, it is difficult to expect a reduction effect of the power consumption because the density is considerably large.

Examples 1 to 3 are specimens foamed with urethane foam corresponding to IA in FIG. 9 in SUS and have different densities. Specifically, Examples 1, 2 and ³ have a density of 310 Kg / m ³ , 220 Kg / m ³ and 170 Kg / m ³ , respectively.

Examples 4 to 6 are specimens foamed with urethane foam corresponding to IB in FIG. 9 in SUS, and have different densities. Specifically, Examples 4, 5 and 6 have a density of 320 Kg / m ³ , 200 Kg / m ³ and 150 Kg / m ³ , respectively.

Examples 7 and 8 are specimens obtained by foaming urethane foam corresponding to the IC of FIG. 9 in SUS, and have different densities. Specifically, Example 7 and Example 8 have a density of 290 Kg / m ³ and 150 Kg / m ³ , respectively.

In Examples 9 to 12, urethane foams corresponding to AD shown in Fig. 9 were foamed in SUS, and they have different densities. Specifically, Examples 9, 10, 11 and 12 have a density of 90 Kg / m ³ , 180 Kg / m ³ , 220 Kg / m ³ and 250 Kg / m ³ , respectively.

Examples 13 to 15 are specimens in which urethane foam corresponding to the ID shown in Fig. 9 is foamed in SUS and have different densities. Specifically, Examples 13, 14 and 15 have a density of 380 Kg / m ³ , 500 Kg / m ³ and 770 Kg / m ³ , respectively.

Examples 16 to 20 are specimens foamed with urethane foam corresponding to the IE of FIG. 9 in SUS and have different densities. Specifically, Example 16, Example 17, Example 18, Example 19 and Example 20 are each ^{150 Kg / m 3, 280 Kg} / m 3, 300 Kg / m 3, 420 Kg / m 3 and 620 Kg / m < ^{3 &} gt ;.

As can be seen from Fig. 8, Example 7 and Example 8 have a density lower than that of Comparative Example 2, and have a damping ratio similar to Comparative Example 2. In addition, Embodiment 7 and Embodiment 8 have a suitable density and a relatively large damping ratio when compared with other embodiments. Therefore, it can be confirmed that the seventh embodiment and the eighth embodiment have excellent vibration damping performance and can reduce power consumption.

10 is a table showing the relationship between the mixing ratio of various specimens and the damping ratio. Fig. 10 shows the result of measuring the damping ratio by varying the mixing ratio of the polyol system and the isocyanate, with respect to a plurality of specimens having the same conditions as those of Example 7, which proved to have the best vibration damping performance in Figs. 8 and 9 . That is, Fig. 10 shows the damping ratio according to the mixing ratio of the specimen having the density of 290 Kg / m < ³ > (hereinafter, Examples) in which urethane foam corresponding to IC of Fig. 9 is foamed in SUS. At this time, a specimen having asphalt attached to SUS is used as a comparative example.

As can be seen from FIG. 10, in the comparative example, the damping ratio is 0.177, which is relatively large, but the density is as high as 1,480 Kg / m ³ . Therefore, in the case of the comparative example, although the vibration damping performance is relatively excellent, it is difficult to expect a reduction in power consumption because the density is considerably large. Example 4 is a specimen in which a urethane foam corresponding to the IC shown in Fig. 9 is foamed in SUS and has a density of 290 Kg / m < ³ >, and a mixing ratio of polyol system and isocyanate of 100: 60. Example 4 has a density of 290 Kg / m < ³ > which is only about 20% of the density of the comparative example and has a damping ratio of 0.175, which is similar to the damping ratio of the comparative example. Also, Embodiment 4 has a greater damping ratio than other embodiments. Therefore, it can be seen that the specimen of Example 4 having a mixing ratio of polyol system of 100: 60 and isocyanate has the best vibration damping performance and can have the best power consumption reduction effect.

11 is a table showing the relationship between density, mixing ratio and damping ratio of various specimens. Fig. 11 shows results of measuring damping ratios and thermal conductivities with different densities for a plurality of specimens having the same conditions as those of Example 4, which proved to have the best vibration damping performance in Fig. That is, FIG. 10 shows the damping ratio and the thermal conductivity according to the density of the specimen having the mixing ratio of 100: 60 (hereinafter, Examples) in which the urethane foam corresponding to the IC of FIG. 9 is foamed in the SUS. At this time, a specimen having asphalt attached to SUS is used as a comparative example.

As can be seen in FIG. 11, the comparative example has a relatively large damping ratio of 0.177 but a relatively large density of 1,480 Kg / m ³ . Therefore, in the case of the comparative example, although the vibration damping performance is relatively excellent, it is difficult to expect a reduction in power consumption because the density is considerably large. Further, in the case of the comparative example, it has a relatively large thermal conductivity of 80 Mw / m · K. Therefore, it is difficult to expect a satisfactory adiabatic effect in the comparative example. Embodiments 2 to 5 having a density of 150 Kg / m ³ to 300 Kg / m ³ have a large damping ratio of 0.16 or more and 0.2 or less, and a thermal conductivity of 60 Mw / m · K or less . Therefore, in the case of Embodiments 2 to 5, superior vibration damping performance, superior power consumption reduction effect, and satisfactory heat insulation effect can be expected.

12 is a view schematically showing a process of foaming a urethane foam between a washing tank and a main body in a dishwasher according to another embodiment of the present invention. As described above, the washing tub 30 may be provided inside the body 10 so as to have at least one opened face. 12, the case where the cleaning tank 30 includes a plurality of open surfaces will be mainly described. Specifically, FIG. 12 mainly describes the case where the cleaning tank 30 has open front and top surfaces. At this time, the main body 10 may have a shape corresponding to the washing tub 30. That is, the front surface and the upper surface of the main body 10 can be opened to correspond to the washing tub 30. The dishwasher 1 includes a plurality of doors that are rotatably installed on the main body 10 to open and close a plurality of open faces of the washing tub 30 when the washing tub 30 includes a plurality of open faces . That is, the dishwasher 1 may include a front door provided to open and close an opened front face of the washing tub 30, and an upper door configured to open and close an opened upper face of the washing tub 30. Hereinafter, those overlapping with those described in Fig. 5 may be omitted.

As shown in Fig. 12 (a), a cleaning tank 30 having an opened front surface and an upper surface is prepared. At least one opening (50) may be formed in the washing tank (30).

As shown in FIG. 12 (b), at least one opening 50 formed in the washing tub 30 is sealed. Closing at least one opening (50) with a sealing member (70).

A plug 80 fmf is inserted into the washing tub 30, as shown in Fig. 12 (c).

12 (d), the washing tank 30 having the plug 800 inserted therein is inserted into the foaming mold 90. At this time, the temperatures of the foaming mold 90 and the plug 80 are 40 ° C to 50 ° C After the washing tub 30 is inserted into the foaming mold 90, the urethane foam liquid is poured onto the outside of the washing tub 30 using the injection head 601 of the foaming machine 600 After the discharge of the urethane foam liquid is completed, the foaming mold 90 is covered with a foaming mold lid to cure the urethane foam liquid.

12 (e), after the lapse of the curing time of about 5 minutes to 10 minutes, the foamed mold lead is separated and the cleaning tank 30 having the urethane foam 500 foamed is removed from the foam metal mold 90 Separate.

12 (f), the washing tub 30 having the urethane foam 500 foamed on the outer wall thereof is engaged with the main body 10. At this time, the urethane foam 500 may be provided with at least one opening 50a corresponding to at least one opening 50 formed in the washing tub 30. [

As described above, the urethane foam 500 can be disposed between the main body 10 and the washing tub 30. Preferably, the urethane foam 500 is disposed between the main body 10 and the washing tub 30 so as to enclose the outer rear surface, the outer left surface, the outer right surface 34a and the outer bottom surface 35a of the washing tub 30 .

The urethane foam 500 may be disposed inside at least one of the front door and the upper door. Preferably, the urethane foam 500 may be disposed inside each of the front door and the upper door.

The foregoing has shown and described specific embodiments. However, it should be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the technical idea of the present invention described in the following claims .

1: dishwasher 10: main body
11: Door 11a: First door frame
11b: second door frame 12a, 12b: basket
30: washing tub 31: inner upper surface
32: inner rear surface 33: inner seating surface
34a: outer right side 35: bottom side
35a: outer bottom surface 50: opening
50a: opening 51: circulation pump
52: drain pump 70: sealing member
80: plug 90: foam mold
92: Foam mold 92a: First bubble mold
92b: second blowing mold 311, 313, 330, 340: injection nozzle
312, 314, 331, 341: injection holes 400: vane
500: urethane foam 600: blowing agent
601: injection head 700: specimen
810: Striking member 820: Specimen fixing member
830: Vibration measuring device 840: Analyzing device
850: Output device

Claims (19)

main body;
A cleaning tank having at least one surface that is opened and provided inside the main body; And
And a urethane foam disposed between the main body and the washing tank, the urethane foam being produced by a foaming reaction of a polyol system and isocyanate,
Wherein the urethane foam has a density of 150 kg / m ³ or more and 300 kg / m ³ or less. The method according to claim 1,
Wherein the mixing ratio of the polyol system and the isocyanate is 100: 40 to 100: 80. The method according to claim 1,
Wherein the urethane foam has a damping ratio of 0.16 or more and 0.2 or less. The method according to claim 1,
Wherein the urethane foam has a thermal conductivity of 0.6 W / m · K or less. The method according to claim 1,
Wherein the polyol system comprises a polyether polyol having from 2 to 8 functional groups. 6. The method of claim 5,
Wherein the polyol system further comprises a dispersion type polymer polyol in which a styrene monomer and an acrylonitrile monomer are copolymerized. The method according to claim 1,
Wherein the isocyanate has a specific gravity of 1.21 to 1.22. 6. The method of claim 5,
The polyol system further comprises a chain extender,
Wherein the chain extending agent comprises at least one of a short chain alcohol having 2 or more and 6 or less functional groups and a short chain amine having 2 or more and 6 or less functional groups. 6. The method of claim 5,
Wherein the polyol system further comprises at least one of a physical blowing agent and a chemical blowing agent. The method according to claim 1,
Wherein the urethane foam is arranged to surround at least a part of the washing tub. The method according to claim 1,
Further comprising a door rotatably installed on the main body to open and close at least one open side of the washing tub,
Wherein the urethane foam is further disposed inside the door. main body;
A cleaning tank having at least one surface that is opened and provided inside the main body;
A door rotatably installed in the main body to open and close at least one open side of the washing tub; And
A urethane foam disposed in at least one of the interior of the door and the body and the washing tank and formed by a foaming reaction of a polyol system and isocyanate,
Wherein the urethane foam has a density of 150 kg / m ³ or more and 300 kg / m ³ or less, a damping ratio of 0.16 or more and 0.2 or less, and a thermal conductivity of 0.6 W / m · K or less. 13. The method of claim 12,
Wherein the cleaning tank includes an outer wall facing the main body,
Wherein the urethane foam is disposed to surround at least a part of the outer wall of the washing tub. 13. The method of claim 12,
Wherein the mixing ratio of the polyol system and the isocyanate is 100: 40 to 100: 80. 13. The method of claim 12,
Wherein the polyol system comprises a polyether polyol having from 2 to 8 functional groups. 16. The method of claim 15,
Wherein the polyol system further comprises a dispersion type polymer polyol in which a styrene monomer and an acrylonitrile monomer are copolymerized. 13. The method of claim 12,
Wherein the isocyanate has a specific gravity of 1.21 to 1.22. 16. The method of claim 15,
The polyol system further comprises an additive,
Wherein the additive comprises at least one of a blowing agent, a chain extender, a catalyst, a surfactant, a flame retardant, a pigment, an inorganic filler, and a cross linker. 19. The method of claim 18,
Wherein the chain extending agent comprises at least one of a short chain alcohol having 2 or more and 6 or less functional groups and a short chain amine having 2 or more and 6 or less functional groups.

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