Silencing heater and dishwasher comprising same

Abstract

The utility model relates to the field of dish-washing machines, and discloses a silencing heater and a dish-washing machine comprising the same, a closed silencing cavity is arranged in the heater, and a communicating hole is formed in the wall surface of the silencing cavity to communicate the silencing cavity with the external space of the heater or a first fluid channel in the heater; the length of a path from the communicating hole to the end part of the extension direction of the silencing cavity is L, the preset silencing frequency of the heater is f, the propagation speed of sound waves in the silencing cavity is c, f = c / (4L), and a 1 / 4 wavelength tube is formed at the silencing cavity, so that the phase difference of incident waves and reflected waves is 180 degrees when the sound waves enter the silencing cavity from the communicating hole, and the incident waves and the reflected waves are mutually counteracted to achieve the silencing effect. The silencing cavity and the communicating hole are formed in the heater to form the 1 / 4 wavelength pipe, noise in the working process of the heater can be reduced, and meanwhile the structure is compact. When the heater is used in the dish-washing machine, noise in the drying process of the dish-washing machine can be reduced, and the dish-washing machine is compact in structure or convenient to upgrade and improve.

Description

Technical Field

[0001] This utility model relates to the field of dishwashers, and more particularly to a noise-reducing heater. Background Technology

[0002] Existing dishwashers commonly use positive temperature coefficient thermistor heaters, also known as PTC heaters. Figure 1 This diagram illustrates a partial structure of an existing dishwasher employing a PTC heater, such as... Figure 1 The fan 200', PTC heater 100', and drying pipe 300' are connected in series. The PTC heater structure is as follows: Figure 2 During the drying process, the fan blows hot air through the PTC heater, which then enters the dishwasher cavity to achieve the drying effect. However, as the air passes through the PTC heater, it generates noise from the heating elements inside the PTC heater. At the same time, the fan also generates noise when it is working, resulting in a relatively loud noise level during the dishwasher's drying process. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defect of high drying noise in the prior art of dishwashers, and to provide a noise-absorbing heater and a dishwasher including the heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A noise-absorbing heater includes a closed noise-absorbing cavity inside the heater. A connecting hole is provided on the wall of the noise-absorbing cavity, which connects the noise-absorbing cavity to the external space of the heater or to a first fluid channel inside the heater. The path length from the connecting hole to the end of the noise-absorbing cavity in the extending direction is L. The preset noise-absorbing frequency of the heater is f, and the propagation speed of the sound wave in the noise-absorbing cavity is c, where f = c / (4L). A 1 / 4 wavelength tube is formed in the noise-absorbing cavity, such that the phase difference between the incident wave and the reflected wave of the sound wave with frequency f entering the noise-absorbing cavity from the connecting hole is 180°.

[0006] In this design, a connecting hole is provided on the wall of the silencing cavity, connecting the silencing cavity to the external space of the heater, or connecting the silencing cavity to the first fluid channel of the heater. The length from the connecting hole to the end of the silencing cavity is L, and f = c / (4L). A 1 / 4 wavelength tube is formed at the silencing cavity, so that the incident wave and the reflected wave of the sound wave with frequency f enter the silencing cavity through the connecting hole have a phase difference of 180°, canceling each other out to achieve a silencing effect. By setting the silencing cavity and connecting hole to form a 1 / 4 wavelength tube on the heater, on the one hand, the noise during the operation of the heater can be reduced; on the other hand, integrating the silencing structure into the heater can make the structure compact.

[0007] Applying a heater to a dishwasher for drying or providing hot water can reduce noise during the drying or hot water supply process. This eliminates the need for sound-absorbing structures in other parts of the dishwasher or changes to its original structure, making the dishwasher more compact or easier to upgrade and improve.

[0008] Preferably, the distances of the connecting hole from the two ends of the silencing cavity in the extending direction are different.

[0009] Preferably, the connecting holes and the silencing cavities are arranged in a one-to-one correspondence.

[0010] Preferably, the heater has a plurality of said silencing chambers, at least some of said silencing chambers having different extension lengths.

[0011] Preferably, the heater has a plurality of the silencing cavities, and at least some of the connecting holes correspond to different L values.

[0012] Preferably, the heater includes a heating section, the heating section includes a pair of heating units, the heating units are provided with grooves, the groove openings of the pair of heating units face each other and surround each other to form the silencing cavity, and at least one of the heating units of the heating section is provided with the communicating hole.

[0013] Preferably, the heating section is provided with multiple sound-absorbing cavities, and the connecting holes on the same heating section are arranged on the same heating unit.

[0014] Preferably, the heating unit has a plurality of grooves spaced apart and parallel on the same side to form a plurality of the silencing cavities.

[0015] Preferably, the outer surface of the heating part at the groove protrudes outward relative to other parts of the heating part, and the height of the protruding part is less than its width.

[0016] Preferably, the heater has a cavity, at least one end of the cavity extending in the direction of extension has an opening, the heater further includes an insert corresponding to the opening at the end of the cavity, the insert is inserted from the opening at the end of the cavity and closes the end of the cavity, the insert and the surface of the cavity together form the silencing cavity.

[0017] Preferably, the heater has a plurality of parallel cavities with the same extension length, and at least some of the inserts are inserted into the cavities for different lengths, such that the path length of the connecting hole corresponding to the cavity is different from that of the insert.

[0018] Preferably, the heater includes a heating section, the heating section includes a pair of heating units, the heating units are provided with grooves, and the groove openings of the pair of heating units face each other and surround each other to form the cavity.

[0019] Preferably, the end opposite to the silencing cavity is flush with the cavity end corresponding to the insert.

[0020] Preferably, the heater is a positive temperature coefficient thermistor heater, the heater includes a plurality of plate-shaped heating parts, two adjacent heating parts are combined in a V shape, and a first fluid channel is formed between two adjacent heating parts, and the silencing cavity is formed inside the heating part.

[0021] Preferably, the connecting hole connects the first fluid channel and the silencing cavity, and the silencing cavity extends parallel to the first fluid channel.

[0022] Preferably, the silencing cavity extends in a straight line.

[0023] A dishwasher includes an air inlet duct and a drying duct. The dishwasher also includes a noise-absorbing heater as described in any of the above technical solutions. The heater further includes a heating duct. The heater is disposed within the heating duct. The outer surface of the heater and the inner surface of the heating duct form an external space for the heater. The air inlet duct, the second fluid channel, and the drying duct are sequentially connected. The connecting hole connects the external space of the heater and the noise-absorbing cavity.

[0024] A dishwasher includes an air inlet duct and a drying duct. The dishwasher also includes a noise-absorbing heater as described in any of the above technical solutions. The air inlet duct, the first fluid channel, and the drying duct are connected in sequence. The connecting hole connects the first fluid channel and the noise-absorbing cavity.

[0025] A dishwasher includes a water inlet pipe and a hot water pipe, and the dishwasher also includes a noise-absorbing heater as described in any of the above technical solutions; the heater further includes a heating pipe, the heater is disposed in the heating pipe, the outer surface of the heater and the inner surface of the heating pipe form the outer space of the heater, the water inlet pipe, the outer space of the heater and the hot water pipe are sequentially connected, and the connecting hole connects the outer space of the heater and the noise-absorbing cavity.

[0026] A dishwasher includes a water inlet pipe and a hot water pipe, and the dishwasher also includes a noise-absorbing heater as described in any of the above technical solutions; the water inlet pipe, the first fluid channel, and the hot water pipe are connected in sequence, and the connecting hole connects the first fluid channel and the noise-absorbing cavity.

[0027] The positive and progressive effects of this utility model are as follows:

[0028] The length from the connecting hole to the end of the silencing cavity is L, and f = c / (4L), forming a 1 / 4 wavelength tube. This ensures that the incident and reflected waves of a sound wave with frequency f entering the silencing cavity from the connecting hole have a phase difference of 180°, canceling each other out to achieve a silencing effect. By setting the silencing cavity and connecting hole to form a 1 / 4 wavelength tube on the heater, on the one hand, the noise during the heater's operation can be reduced; on the other hand, integrating the silencing structure into the heater allows for a compact structure.

[0029] Applying a heater to a dishwasher for drying or providing hot water can reduce noise during the drying or hot water supply process. This eliminates the need for sound-absorbing structures in other parts of the dishwasher or changes to its original structure, making the dishwasher more compact or easier to upgrade and improve. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a partial structure of an existing dishwasher;

[0031] Figure 2 for Figure 1 A schematic diagram of the intermediate heater;

[0032] Figure 3 This is a perspective view of the muffler in Example 1;

[0033] Figure 4 This is a perspective view of the muffler in Example 1;

[0034] Figure 5 This is a perspective view of the muffler in Example 1;

[0035] Figure 6 for Figure 5 Enlarged view of section A in the middle;

[0036] Figure 7 This is a cross-sectional view of the heating section in Example 2;

[0037] Figure 8 for Figure 7 Enlarged view of section B in the middle.

[0038] Figure 9 This is a schematic diagram of the heating unit and insert fitting in Example 2;

[0039] Figure 10 This is a schematic diagram of the heating unit and insert fitting in Example 2;

[0040] Explanation of reference numerals in the attached figures:

[0041] Heater 100;

[0042] Heating section 1;

[0043] Connecting hole 11;

[0044] Heating unit 12, groove 13, connection 14;

[0045] Cavity 15;

[0046] Insert 2;

[0047] Silencing cavity 3;

[0048] First fluid channel 4. Detailed Implementation

[0049] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0050] Example 1

[0051] This embodiment provides a heater. Figures 3-6 This is a schematic diagram of this embodiment.

[0052] like Figures 3-6 The heater 100 has a first fluid channel 4 and a closed silencing cavity 3. The heater 100 also has a connecting hole 11 corresponding to the silencing cavity 3. The connecting hole 11 is located on the wall of the silencing cavity 3 to connect the silencing cavity 3 and the first fluid channel 4. The path length from the connecting hole 11 to the end of the silencing cavity 3 in the extending direction is L. The preset silencing frequency of the heater 100 is f, and the propagation speed of the sound wave in the silencing cavity 3 is c, where f = c / (4L). A 1 / 4 wavelength tube is formed at the silencing cavity 3, so that the phase difference between the incident wave and the reflected wave entering the silencing cavity 3 from the connecting hole 11 is 180°, canceling each other out to achieve a silencing effect. By setting the silencing cavity 3 and the connecting hole 11 to form a 1 / 4 wavelength tube on the heater 100, on the one hand, the noise when the fluid flows through the heater 100 can be reduced; on the other hand, integrating the silencing structure into the heater 100 can make the structure compact. In other embodiments, the silencing cavity 3 and the external space of the heater 100 can be connected through the connecting hole 11. When the fluid flows from the external space of the heater 100 and is heated, the sound waves enter the silencing cavity 3 through the connecting hole 11, which can reduce the noise of the fluid flowing through the heater 100.

[0053] like Figure 5 In this embodiment, the heater 100 includes a plurality of plate-shaped heating portions 1, and two adjacent heating portions 1 are combined in a V-shape to form a first fluid channel 4 between two adjacent heating portions 1, such as... Figure 6A silencing cavity 3 is formed inside the heating part 1, and a connecting hole 11 is also correspondingly provided on the heating part 1. The accompanying drawings of this embodiment only show the silencing cavity 3 and connecting hole 11 on one heating part 1, omitting the silencing cavities 3 and connecting holes 11 in other locations. Specifically, in this embodiment, the heater 100 is a positive temperature coefficient thermistor heater 100, also known as a PTC heater 100. The main difference from existing PTC heaters 100 is the provision of a silencing cavity 3 and a connecting hole 11 to achieve a silencing effect. In other embodiments, the heater 100 may be, but is not limited to, a folded PTC, a circular, or a rod-shaped heater 100; the heating part 1 may be, but is not limited to, a sheet-like, circular, or rod-shaped structure, and may employ one or more heating parts 1. When there are multiple heating parts 1, the position between two adjacent heating parts 1 can be flexibly adjusted according to arrangement needs.

[0054] The silencing cavity 3 can extend straight or curved; when the silencing cavity 3 extends in a straight line, it simplifies the installation of the heater 100, such as... Figure 3 , Figure 6 The connecting hole 11 does not extend parallel to the silencing cavity 3. In this embodiment, the connecting hole 11 and the silencing cavity 3 are specifically arranged perpendicularly, resulting in a simple and compact structure. Figure 3 , Figure 6 The first fluid channel 4 and the silencing cavity 3 extend in parallel, specifically along the length direction X of the heater 100. Furthermore, the width direction of the heater 100 is the Y direction, and the height direction is the Z direction.

[0055] One or more connecting holes 11 can be provided on the wall of a sound-absorbing cavity 3. When the sound-absorbing cavity 3 and the connecting holes 11 correspond one-to-one, the structure is simple and the sound leakage in the sound-absorbing cavity 3 can be avoided from affecting the noise reduction effect.

[0056] It is understood that the preset silencing frequency f referred to in this utility model includes one or more frequencies. This can be achieved by setting the distances of the connecting hole 11 from the two ends of the silencing cavity 3 along its extension direction to be the same or different. For example... Figure 4 In the bottommost connecting hole 11 and the silencing cavity 3, the distances from the connecting hole 11 to the two ends of the silencing cavity 3 are L1 and L2, respectively, where L1 ≠ L2. When L is L1, a preset silencing frequency f1 can be obtained, f1 = c / (4L1); when L is L2, another preset silencing frequency f2 can be obtained, f2 = c / (4L2). By setting L1 ≠ L2, multi-frequency silencing can be achieved.

[0057] In a preferred embodiment, multiple silencing cavities 3 can be provided, and the L corresponding to the connecting holes 11 in all or some of the silencing cavities 3 can be different to expand the silencing frequency range. Figure 4The two L's corresponding to each connecting hole 11 shown in the diagram are all different. In other embodiments, when multiple silencing cavities 3 are provided, the extension lengths of the silencing cavities 3 can be set to be different, and the connecting holes 11 at each silencing cavity 3 can be aligned so that the L's corresponding to the connecting holes 11 are different; for example, ... Figure 4 The three silencing cavities 3 are set at different lengths along the X direction, and the three connecting holes 11 are set at the same position in the X direction.

[0058] In other embodiments, the number, shape, and relative position of the silencing cavity 3 and the connecting hole 11 can be flexibly adjusted.

[0059] Example 2

[0060] This embodiment provides a heater. The main difference between this embodiment and Embodiment 1 is the arrangement of the heating element. The overall structure of the heater can be referred to that of Embodiment 1. Figures 7-10 This is a schematic diagram of this embodiment.

[0061] like Figure 7 , Figure 8 The heating part 1 includes a pair of heating units 12, each heating unit 12 having a groove 13. The openings of the grooves 13 of the two heating units 12 are facing each other, and the two grooves 13 together form a cavity 15.

[0062] like Figures 8-10 At least one end of the cavity 15 extending in the direction of extension has an opening. The heater also includes an insert 2 corresponding to the opening at the end of the cavity 15. The insert 2 is inserted into the opening at the end of the cavity 15 to close the end of the cavity 15, so that the surface of the cavity 15 and the surface of the insert 2 enclose and form a silencing cavity. A connecting hole 11 is provided on the heating unit 12 to connect the silencing cavity and the first fluid channel. The insert 2 is inserted into the cavity 15 and forms a gap within a preset range with the surface of the cavity 15, which can be considered as the insert 2 closing the end of the cavity 15. By closing the end opening of the cavity 15 with the insert 2, on the one hand, the manufacturing process of the heating part 1 can be simplified, and on the other hand, the length of the silencing cavity can be adjusted by adjusting the length of the insert 2 inserted into the cavity 15, thereby adjusting the silencing frequency.

[0063] like Figure 9 , Figure 10 The end of the insert 2 is aligned with the end of the corresponding cavity 15 to prevent the insert 2 from being exposed outside the cavity 15 and interfering with fluid flow. At this time, the length L3 of the insert 2 can be adjusted to adjust the length L2 of the connecting hole 11.

[0064] like Figure 9 , Figure 10A heating part 1 is provided with multiple parallel cavities 15 with the same extension length. Each insert 2 on the same heating part 1 is inserted into the cavity 15 for a different length to adjust L2 corresponding to the connecting hole 11, thereby adjusting f2.

[0065] like Figure 9 , Figure 10 Multiple grooves 13 on the heating unit 12 are spaced apart on the same side of the heating unit 12 to form multiple cavities 15, thereby forming multiple sound-absorbing cavities together with the insert 2. Furthermore, the multiple grooves 13 on the heating unit 12 can be arranged in parallel or non-parallel, with parallel arrangement being more convenient for processing.

[0066] like Figure 8 The outer surface of the heating part 1 at the groove 13 protrudes outward relative to the other parts of the heating part 1. By making the heating part 1 protrude outward, the surface area of ​​the heating part 1 can be increased, thereby improving the heating effect of the heating part 1 on the fluid. The height H of the protruding part is less than the width W of the protruding part, so that the height H is as small as possible to reduce the impact on fluid flow. Specifically, in this embodiment, the protruding part is elliptical. Furthermore, a rounded corner can be provided at the connection 14 between the protruding part and the other parts of the heating part 1 to reduce the flow resistance of the fluid at this location.

[0067] The heating unit 12 is plate-shaped, and the combined heating part 1 is also plate-shaped. The heating part 1 can be called a heating plate. The plate-shaped heating part 1 has a large surface area and a good heating effect on the fluid.

[0068] In this embodiment, the heating unit 12 is integrally formed by casting and stamping. Two pairs of heating units 12 are welded together, so that the corresponding two grooves 13 enclose a cavity 15. Then, an insert 2 is inserted to seal the end opening of the cavity 15, forming a sound-absorbing cavity. Using this method, the heat conduction performance of the heating part 1 is ensured to be sufficiently good and unaffected, and the processing is simple and cost-effective.

[0069] In other embodiments, the insert 2 may not be provided. For example, by closing both ends of the groove 13 on the heating unit 12, the two heating units 12 can be combined to form a closed-end silencing cavity.

[0070] In other embodiments, when the heating part 1 is integrally formed, a cavity 15 with an opening at one or both ends can be machined on the heating part 1 by means of casting or machining, and then the insert 2 is inserted into the cavity 15 to close the opening at the end of the cavity 15 to form a sound-absorbing cavity.

[0071] The heater of this invention is suitable for heating air. For example, using the heater of this invention in a dishwasher for drying can reduce the noise during the drying process. The dishwasher has an air inlet duct and a drying duct, and a fan can be installed for air intake, with the fan's air duct serving as an air inlet duct or part of the air inlet duct.

[0072] The air inlet duct, the first fluid channel of the heater, and the drying duct are connected in sequence in the dishwasher. Air flows from the air inlet duct through the first fluid channel in the heater and then into the drying duct to dry the inside of the dishwasher. The connecting hole connects the first fluid channel and the silencing cavity. When the air flows through the first fluid channel, the sound waves enter the silencing cavity through the connecting hole, which plays a role in noise reduction.

[0073] When the heater is installed inside the heating pipe of the dishwasher, the outer surface of the heater and the inner surface of the heating pipe form a second fluid channel, which can also be called the external space of the heater. The air inlet pipe, the second fluid channel, and the drying pipe are connected in sequence. Air flows from the air inlet pipe through the second fluid channel and then into the drying pipe to dry the inside of the dishwasher. The connecting hole connects the second fluid channel and the silencing cavity. When the air flows through the second fluid channel, the sound waves enter the silencing cavity through the connecting hole, which plays a role in noise reduction.

[0074] The heater of this invention is suitable for heating water. For example, using the heater of this invention in a dishwasher to heat water can reduce the noise during the dishwasher's hot water supply process. The dishwasher has a water inlet pipe and a hot water pipe, and can be equipped with a pump for water inlet, with the pump's water channel serving as the water inlet pipe or as part of the water inlet pipe.

[0075] The dishwasher has a water inlet pipe, a heater’s first fluid channel, and a hot water pipe connected in sequence. Water flows from the water inlet pipe through the heater’s first fluid channel and then into the hot water pipe to provide hot water for the dishwasher. The connecting hole connects the first fluid channel and the silencing cavity. When water flows through the first fluid channel, sound waves pass through the connecting hole into the silencing cavity, which has a silencing effect.

[0076] When the heater is installed inside the heating pipe of the dishwasher, the outer surface of the heater and the inner surface of the heating pipe form a second fluid channel, which can also be called the external space of the heater. The water inlet pipe, the second fluid channel, and the hot water pipe are connected in sequence. Water flows from the water inlet pipe through the second fluid channel and then into the hot water pipe to provide hot water for the dishwasher. The connecting hole connects the second fluid channel and the silencing cavity. When water flows through the second fluid channel, sound waves enter the silencing cavity through the connecting hole, which plays a role in noise reduction.

[0077] The fundamental frequency and harmonics of the fan or pump can be calculated based on the parameters of the fan or pump. Then, the required preset noise reduction frequency f can be calculated based on the fundamental frequency and harmonics. Based on this, L1 and L2 corresponding to the connecting hole can be calculated. When setting the insert, L2 can be adjusted by adjusting the length L3 of the insert.

[0078] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A noise-absorbing heater, characterized in that, The heater has a closed silencing cavity, and the wall of the silencing cavity has a connecting hole. The connecting hole connects the silencing cavity to the external space of the heater, or connects the silencing cavity to the first fluid channel in the heater. The path length from the connecting hole to the end of the silencing cavity in the extending direction is L. The preset silencing frequency of the heater is f, and the propagation speed of the sound wave in the silencing cavity is c, f=c / (4L). A 1 / 4 wavelength tube is formed in the silencing cavity, so that the phase difference between the incident wave and the reflected wave of the sound wave with frequency f entering the silencing cavity from the connecting hole is 180°.

2. The noise-absorbing heater as described in claim 1, characterized in that, The distances from the connecting hole to the two ends of the anechoic cavity in the direction of extension are different; And / or, the connecting holes and the silencing cavities are provided in a one-to-one correspondence.

3. The noise-absorbing heater as described in claim 1, characterized in that, The heater has multiple of the aforementioned silencing chambers; At least some of the anechoic cavities have different extension lengths, and / or at least some of the connecting holes have different lengths (L).

4. The noise-absorbing heater as described in claim 1, characterized in that, The heater includes a heating section, which includes a pair of heating units. Each heating unit has a groove, and the groove openings of the pair of heating units face each other and surround each other to form the silencing cavity. At least one of the heating units in the heating section has the connecting hole.

5. The noise-absorbing heater as described in claim 4, characterized in that, The heating section is provided with multiple sound-absorbing cavities, and the connecting holes on the same heating section are arranged on the same heating unit; And / or, the heating unit has a plurality of grooves spaced apart and parallel on the same side to form a plurality of the silencing cavities; And / or, the outer surface of the heating element at the groove protrudes outward relative to other parts of the heating element, and the height of the protruding part is less than its width.

6. The noise-absorbing heater as described in claim 1, characterized in that, The heater has a cavity, and at least one end of the cavity extending in the direction of extension has an opening. The heater also includes an insert corresponding to the opening at the end of the cavity. The insert is inserted into the opening at the end of the cavity and closes the end of the cavity. The surface of the insert and the cavity together form the silencing cavity.

7. The noise-absorbing heater as described in claim 6, characterized in that, The heater has a plurality of parallel cavities with the same extension length, and at least some of the inserts are inserted into the cavities for different lengths, so that the path length of the connecting hole of the cavity to the insert is different. And / or, the heater includes a heating section, the heating section includes a pair of heating units, the heating units are provided with grooves, the groove openings of the pair of heating units face each other and surround each other to form the cavity; And / or, the end of the insert that is away from the silencing cavity is flush with the cavity end corresponding to the insert.

8. The noise-absorbing heater as described in claim 1, characterized in that, The heater is a positive temperature coefficient thermistor heater, which includes multiple plate-shaped heating sections. Two adjacent heating sections are combined to form a V-shape, and a first fluid channel is formed between two adjacent heating sections. The sound-absorbing cavity is formed inside the heating section. And / or, the connecting hole connects the first fluid channel and the silencing cavity, the silencing cavity extending parallel to the first fluid channel; And / or, the anechoic cavity extends in a straight line.

9. A dishwasher comprising an air inlet duct and a drying duct, characterized in that, The dishwasher further includes a noise-reducing heater as described in any one of claims 1-8; The heater further includes a heating pipe, the heater is disposed inside the heating pipe, the outer surface of the heater and the inner surface of the heating pipe form the external space of the heater, the air inlet pipe, the external space of the heater and the drying pipe are connected in sequence, and the connecting hole connects the external space of the heater and the silencing cavity; or, the air inlet pipe, the first fluid channel and the drying pipe are connected in sequence, and the connecting hole connects the first fluid channel and the silencing cavity.

10. A dishwasher, comprising a water inlet pipe and a hot water pipe, characterized in that, The dishwasher further includes a noise-reducing heater as described in any one of claims 1-8; The heater further includes a heating pipe, and the heater is disposed inside the heating pipe. The outer surface of the heater and the inner surface of the heating pipe form the external space of the heater. The water inlet pipe, the external space of the heater, and the hot water pipe are connected in sequence. The connecting hole connects the external space of the heater and the silencing cavity; or, the water inlet pipe, the first fluid channel, and the hot water pipe are connected in sequence. The connecting hole connects the first fluid channel and the silencing cavity.

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