Door body assembly with noise reduction structure and dish washing machine

Abstract

The utility model discloses a door body assembly with a noise reduction structure. The door body assembly comprises an outer door plate. The inner door plate is arranged on the inner side of the outer door plate; the noise reduction structure is arranged in a gap between the outer door plate and the inner door plate; the noise reduction structure is characterized by comprising an outer noise reduction layer set close to the outer door plate, an inner noise reduction layer set close to the inner door plate and an air layer separating the outer noise reduction layer set and the inner noise reduction layer set. Compared with the prior art, the composite noise reduction structure comprising the outer noise reduction layer group and the inner noise reduction layer group is arranged in the door body, so that noise reduction can adapt to various working conditions of the dish washing machine, and the noise reduction stability is enhanced. And the air layer arranged between the outer noise reduction layer group and the inner noise reduction layer group can weaken vibration propagation and reduce noise to a certain extent, so that the effect of further reducing noise is achieved.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, specifically to a door assembly with a noise reduction structure and a dishwasher. Background Technology

[0002] Dishwashers clean dishes by spraying water from nozzles, so water is constantly flowing inside when in normal operation. This water flow, with its energy and impact, causes the dishwasher door to vibrate, thus generating noise.

[0003] A dishwasher door consists of an outer door and an inner door fixed to it. Traditional dishwasher doors typically incorporate sound-absorbing damping components between the inner and outer doors to reduce vibration and noise generated by water flow. For example, Chinese utility model patent application number 201721604612.7 (authorization announcement number CN208573664U) discloses a door cover assembly for a dishwasher and a dishwasher having the same assembly, in which sound-absorbing material is used to fill the gap between the outer panel and the inner cover. Another example is the door structure and dishwasher having the same structure disclosed in Chinese utility model patent application number 2013201992310 (authorization announcement number CN203230313U). By incorporating sound-absorbing damping components between the outer and inner doors and at the lower end of the outer door, the natural frequency of the door's vibration is altered, thereby reducing the probability of acoustic-structure interaction and significantly lowering the noise radiated by the door.

[0004] However, a single sound-absorbing damping component is unlikely to achieve stable and efficient noise reduction under various conditions. When the dishwasher load varies, such as washing a small amount of dishes versus a full load, the impact force of the water flow and the motor speed will differ, and the door's noise reduction capability is easily affected by these different operating conditions. In particular, when the door is heated due to the increased water temperature inside the dishwasher cavity, the viscosity of the damping component decreases, leading to a reduction in stiffness. This makes the door vibration caused by the water flow impact more pronounced, resulting in increased noise. Utility Model Content

[0005] The technical problem to be solved by this utility model is to propose a door assembly and dishwasher that can adapt to different working conditions and thus improve noise reduction stability, in light of the above-mentioned technical status.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a door assembly with a noise reduction structure, including...

[0007] Outer door panel;

[0008] Inner door panel, located inside the outer door panel;

[0009] The noise reduction structure is installed in the gap between the outer door panel and the inner door panel;

[0010] The noise reduction structure is characterized by comprising an outer noise reduction layer group disposed near the outer door panel, an inner noise reduction layer group disposed near the inner door panel, and an air layer separating the two.

[0011] Preferably, the inner noise reduction layer assembly includes a vibration damping layer and an inner sound-absorbing layer, with the inner sound-absorbing layer located outside the vibration damping layer. The vibration damping layer effectively reduces vibration, thereby lowering noise, while the inner sound-absorbing layer, adhered to the outside of the vibration damping layer, further absorbs noise.

[0012] Preferably, the outer noise reduction layer group includes an outer sound-absorbing layer and a sound-insulating layer, with the sound-insulating layer located outside the outer sound-absorbing layer. The outer sound-absorbing layer is preferably made of a different sound-absorbing material than the inner sound-absorbing layer, targeting noise of different frequencies. A sound-insulating layer is then placed outside the outer sound-absorbing layer to prevent noise from being transmitted outwards.

[0013] Preferably, the damping layer is made of a damping material. The damping layer, when bonded to the inner door panel, increases the rigidity of the inner panel and effectively reduces vibration, thereby lowering noise.

[0014] Specifically, the noise reduction structure also includes vibration damping blocks, with the inner and outer sides of the vibration damping blocks abutting against the inner and outer noise reduction layer groups respectively, thereby forming an air layer between the inner and outer noise reduction layer groups. In other words, the air layer is formed by the vibration damping blocks.

[0015] Furthermore, the vibration damping block extends into a strip shape along the plane of the outer door panel. The strip-shaped vibration damping block has a larger contact area with the inner and outer noise reduction layers, which can more evenly resist them and prevent the air layer from being compressed. Multiple vibration damping blocks can also be set according to the actual situation.

[0016] Preferably, the inner surface of the damping block protrudes inward to form a convex portion, and the inner sound-absorbing layer has a channel for the convex portion to pass through. After passing through the channel, the convex portion tightly abuts against the inner side of the damping layer. The convex portion on the surface of the damping block is in close contact with the damping layer, making the damping block equivalent to a reinforcing rib structure on the surface of the inner door panel, further increasing the rigidity of the inner door panel. Therefore, the vibration generated by water flow impacting the door surface is reduced, thereby achieving noise reduction.

[0017] Specifically, the inner door panel has a first plate and a second plate. The second plate is located in the middle of the inner door panel and is recessed outward relative to the first plate. The first plate surrounds the outer periphery of the second plate, and the first plate and the second plate are connected by a connecting part.

[0018] The vibration damping layer includes two independent damping pads: a first damping pad and a second damping pad. The first damping pad is tightly attached to the outer side of the first plate, and the second damping pad is tightly attached to the outer side of the second plate. The vibration damping layer is divided into two independent parts that are respectively attached to the first plate and the second plate. No damping layer is provided at the corresponding connection part, so that the vibration damping layer can fit more tightly with the inner door panel.

[0019] This utility model also proposes a dishwasher, characterized in that it is provided with a door assembly as described in any one of the above claims.

[0020] Compared with existing technologies, the advantages of this invention are as follows: A composite noise reduction structure comprising an outer noise reduction layer and an inner noise reduction layer is installed inside the door, enabling noise reduction to adapt to various operating conditions of the dishwasher and enhancing its stability. The air layer between the outer and inner noise reduction layers can weaken vibration transmission and reduce noise to a certain extent, achieving a further noise reduction effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is an exploded view of an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0024] Figure 4 for Figure 3 Enlarged diagram of point A in the middle. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-4 The image shows a preferred embodiment of a door assembly with a noise reduction structure and a dishwasher according to this utility model.

[0027] The dishwasher in this embodiment has a door assembly, such as Figure 1 As shown, the door assembly includes an outer door panel 1 and an inner door panel 2, with the inner door panel 2 fixedly mounted to the inside of the outer door panel 1. A noise reduction structure is provided in the gap between the outer door panel 1 and the inner door panel 2, such as... Figure 2 As shown, the structure includes an outer noise reduction layer 5 located near the outer door panel 1, an inner noise reduction layer 3 located near the inner door panel 2, and an air layer 6 separating the two. The composite noise reduction structure, including the outer noise reduction layer 5 and the inner noise reduction layer 3, can adapt to various operating conditions of the dishwasher, enhancing the stability of noise reduction. The air layer 6 can reduce vibration transmission and reduce noise to a certain extent, achieving a further noise reduction effect.

[0028] Please continue to refer to this. Figure 2 The inner noise reduction layer group 3 includes a vibration damping layer 31 and an inner sound-absorbing layer 32. The vibration damping layer 31 is preferably made of a damping material and is attached to the inner door panel 2 to increase the rigidity of the inner door panel 2, which can effectively reduce vibration and thus reduce noise. The inner sound-absorbing layer 32 is attached to the outside of the vibration damping layer 31 to further absorb noise.

[0029] The outer noise reduction layer group 5 includes an outer sound-absorbing layer 51 and a sound insulation layer 52. The outer sound-absorbing layer 51 is preferably made of a different sound-absorbing material than the inner sound-absorbing layer 32. For noise of different frequencies, a sound insulation layer 52 is set on the outside of the outer sound-absorbing layer 51 to prevent noise from being transmitted outward.

[0030] like Figure 3 and Figure 4 As shown, the noise reduction structure also includes a vibration damping block 4. The inner and outer sides of the vibration damping block 4 abut against the inner noise reduction layer group 3 and the outer noise reduction layer group 5, respectively, thereby forming an air layer 6 between the inner noise reduction layer group 3 and the outer noise reduction layer group 5. In other words, the air layer 6 is formed by the vibration damping block 4. Preferably, the vibration damping block 4 can be made of an elastic material.

[0031] The damping block 4 extends in a strip shape along the plane of the outer door panel 1, such as... Figure 2 As shown, the strip-shaped damping block 4 has a larger contact area with the inner and outer noise reduction layers 5, allowing it to more evenly contact them and prevent the air layer 6 from being compressed. Multiple damping blocks 4 can be provided depending on the actual situation; in this embodiment, three such damping blocks 4 are arranged at intervals.

[0032] The inner surface of the damping block 4 protrudes inward to form a protrusion 41. The inner sound-absorbing layer 32 has a channel 321 through which the protrusion 41 passes. After passing through the channel 321, the protrusion 41 comes into close contact with the inner side of the damping layer 31. The protrusion 41 on the surface of the damping block 4 fits tightly with the damping layer 31, making the damping block 4 equivalent to a reinforcing rib structure on the surface of the inner door panel 2, thereby further increasing the rigidity of the inner door panel 2. As a result, the vibration generated by water flow impacting the door surface will be reduced, thus achieving noise reduction.

[0033] like Figure 2 As shown, the inner door panel 2 has a first flat plate 2a and a second flat plate 2b. The second flat plate 2b is located in the middle of the inner door panel 2 and is recessed outward relative to the first flat plate 2a. The first flat plate 2a surrounds the outer periphery of the second flat plate 2b, and the first flat plate 2a and the second flat plate 2b are connected by a connecting part. The vibration damping layer 31 includes an independent first vibration damping pad 31a and a second vibration damping pad 31b. The first vibration damping pad 31a is in close contact with the outer side of the first flat plate 2a, and the second vibration damping pad 31b is in close contact with the outer side of the second flat plate 2b. The vibration damping layer 31 is divided into two independent parts that are respectively attached to the first flat plate 2a and the second flat plate 2b. The vibration damping layer 31 is not provided at the position corresponding to the connecting part, so that the vibration damping layer 31 can fit more tightly with the inner door panel 2.

[0034] During the washing process, the temperature of the inner door panel 2 rises due to the increased water temperature inside the dishwasher cavity. This reduces the adhesion between the damping layer 31 and the inner door panel 2, leading to a decrease in rigidity. Consequently, the vibration of the inner door panel 2 caused by the water flow impact becomes more pronounced, resulting in increased noise. In this embodiment, a composite noise reduction structure is incorporated within the door assembly. Even when the noise reduction effect of the damping layer 31 decreases due to heat, the inner sound-absorbing layer 32, the outer sound-absorbing layer 51, and the sound-insulating layer 52 still contribute to reducing noise, achieving more stable noise reduction performance.

Claims

1. A door assembly with a noise reduction structure, comprising: Outer door panel (1); Inner door panel (2) is located inside the outer door panel (1); The noise reduction structure is set in the gap between the outer door panel (1) and the inner door panel (2); Its features are, The noise reduction structure includes an outer noise reduction layer group (5) located near the outer door panel (1), an inner noise reduction layer group (3) located near the inner door panel (2), and an air layer (6) separating the two.

2. The door assembly according to claim 1, characterized in that, The inner noise reduction layer group (3) includes a vibration damping layer (31) and an inner sound absorption layer (32), with the inner sound absorption layer (32) located outside the vibration damping layer (31).

3. The door assembly according to claim 2, characterized in that, The outer noise reduction layer group (5) includes an outer sound absorption layer (51) and a sound insulation layer (52), with the sound insulation layer (52) located outside the outer sound absorption layer (51).

4. The door assembly according to claim 3, characterized in that, The vibration damping layer (31) is made of damping material.

5. The door assembly according to claim 4, characterized in that, The noise reduction structure also includes a vibration damping block (4), with the inner and outer sides of the vibration damping block (4) abutting against the inner noise reduction layer group (3) and the outer noise reduction layer group (5) respectively, thereby forming an air layer (6) between the inner noise reduction layer group (3) and the outer noise reduction layer group (5).

6. The door assembly according to claim 5, characterized in that, The damping block (4) extends in a strip shape along the plane of the outer door panel (1).

7. The door assembly according to claim 6, characterized in that, The inner surface of the damping block (4) protrudes inward to form a protrusion (41), and the inner sound-absorbing layer (32) has a channel (321) through which the protrusion (41) passes. After the protrusion (41) passes through the channel (321), it comes into close contact with the inner side of the damping layer (31).

8. The door assembly according to any one of claims 3 to 7, characterized in that, The inner door panel (2) has a first flat plate (2a) and a second flat plate (2b). The second flat plate (2b) is located in the middle of the inner door panel (2) and is recessed outward relative to the first flat plate (2a). The first flat plate (2a) surrounds the outer periphery of the second flat plate (2b). The first flat plate (2a) and the second flat plate (2b) are connected by a connecting part.

9. The door assembly according to claim 8, characterized in that, The vibration damping layer (31) includes a first vibration damping pad (31a) and a second vibration damping pad (31b) that are independent of each other. The first vibration damping pad (31a) is in close contact with the outside of the first plate (2a), and the second vibration damping pad (31b) is in close contact with the outside of the second plate (2b).

10. A dishwasher, characterized in that, The door assembly as described in any one of claims 1 to 9 is provided.

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