Base, base assembly and food processor

Abstract

The invention relates to the technical field of household appliances, and discloses a base, a base assembly and a food processor. The base comprises a shell, and the shell is provided with a containing cavity, a first through hole and a ventilation hole. The second cover plate is connected with the shell, a spiral air channel is formed in the second cover plate, an air inlet and an air outlet are formed in the spiral air channel, the air inlet is communicated with the first through hole, and the air outlet is communicated with the ventilation hole; the spiral air duct is at least provided with a contraction section and an expansion section in the extending direction from the air inlet to the air outlet, and the width of the contraction section is different from that of the expansion section. The spiral air duct comprises the contraction section and the expansion section, so that when sound waves pass through the spiral air duct, the sound waves can be collided by the air duct walls of the contraction section and the expansion section for multiple times, the reflection times of the sound waves are increased, the broadband noise of the sound waves is effectively reduced, the total value of the noise is reduced, and the noise reduction effect cannot be reduced even if the structure is used for a long time; and the user experience is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a base, a base assembly and a food processor. Background Art

[0002] At present, food processors such as wall breakers, soymilk machines, and juicers are very popular among users. Food processors use blades to beat food to cook it, but the blade beating process will produce a lot of noise, and the motor that drives the blades to beat will rotate at a speed of up to tens of thousands of revolutions during operation. The mechanical noise of the motor is another major noise source of the food processor. For high-speed motors, the effect of optimizing the motor itself to achieve noise reduction is limited, and the noise value of the whole machine cannot reach the acceptable limit. In addition, the motor dissipates more heat when running at high speed, and a high-speed fan is required to dissipate the heat from the motor. The rotation noise caused by the high-speed rotation of the fan is also another major noise source of the food processor.

[0003] The prior art discloses a food processor exhaust system structure, which is provided with a spiral baffle plate on the motor cover of the motor, and the spiral baffle plate encloses a spiral air duct between the cover bottom plate of the motor cover and the bottom of the base shell, and sound insulation cotton is provided on the inner wall of the spiral air duct, so that when the heat dissipation airflow enters the spiral air duct, it is sound-absorbing and noise-reducing by the sound insulation cotton, and then blocked by the noise reduction ribs in the spiral air duct, decelerating and noise-reducing, and finally reducing wind noise. However, if sound insulation cotton is added to the spiral air duct for sound insulation, it is easily blocked by the dust layer for long-term use, reducing the noise reduction effect, and if the sound insulation cotton falls off after long-term use, the noise reduction effect will be greatly reduced. Summary of the invention

[0004] In view of this, the present invention provides a base, a base assembly and a food processor to solve the problem that the spiral air duct structure arranged on the base has a poor noise reduction effect after long-term use.

[0005] In a first aspect, the present invention provides a base, comprising:

[0006] A housing, wherein the housing is provided with a housing cavity, a first through hole and a ventilation hole, the housing cavity is suitable for accommodating the motor, the first through hole is communicated with the housing cavity, and the ventilation hole is communicated with the outside;

[0007] a second cover plate connected to the housing, wherein a spiral air duct is provided on the second cover plate, wherein an air inlet and an air outlet are provided on the spiral air duct, wherein the air inlet is connected to the first through hole, and the air outlet is connected to the ventilation hole;

[0008] The spiral air duct is provided with at least one contraction section and one expansion section in the extension direction from the air inlet to the air outlet, and the width of the contraction section is different from the width of the expansion section.

[0009] Beneficial effects: By providing a spiral air duct on the second cover plate of the base, and the spiral air duct is arranged to include a contraction section and an expansion section in the extending direction from the air inlet to the air outlet, and the widths of the contraction section and the expansion section are different, when the sound wave passes through the spiral air duct, it can collide with the duct walls of the contraction section and the expansion section multiple times, increasing the number of reflections of the sound wave, more effectively reducing the broadband noise of the sound wave, reducing the total noise value, making the motor noise transmitted from the ventilation hole smaller, and the noise reduction effect will not be reduced after long-term use of this structure, greatly improving the user experience.

[0010] In an alternative embodiment, the width of the contraction section is L1, the width of the expansion section is L2, and 1 < L2 / L1 ≤ 3 is satisfied.

[0011] Beneficial effects: By setting the widths of the contraction section and the expansion section to satisfy 1 < L2 / L1 ≤ 3, the reflection of the sound wave can be better guaranteed, and the noise reduction effect can be improved.

[0012] In an alternative embodiment, the width of the contraction section satisfies L1 > 5 mm.

[0013] In an alternative embodiment, there are multiple contraction sections, and the widths of each contraction section are different;

[0014] and / or, there are multiple expansion sections, and the widths of each expansion section are different.

[0015] Beneficial effects: By setting the contraction section and the expansion section to be multiple, and the widths of each contraction section are different, and the widths of each expansion section are different, the number of reflections of the noise can be maximally increased, the reflection consumption of the noise can be increased, and the total noise value can be reduced.

[0016] In an alternative embodiment, the contraction section and the expansion section are arranged close to the air outlet;

[0017] and / or, the contraction section and the expansion section are arranged in the middle of the spiral air duct.

[0018] Beneficial effects: By arranging the contraction section and the expansion section close to the air outlet or in the middle of the spiral air duct, it can be ensured that the sound wave remains in the spiral air duct after being reflected by the wall surface of the spiral air plate, so that the sound wave is reflected as many times as possible before being transmitted from the air outlet, preventing the sound wave from entering from the air inlet and then running out from the air inlet after reflection, and ensuring the noise reduction effect.

[0019] In an alternative embodiment, the second cover plate includes a second cover body, an air inlet is provided in the middle of the second cover body, the spiral air duct spirals out from the middle of the second cover body to the edge, and the air outlet is arranged at the outer edge of the second cover body.

[0020] Beneficial effect: By setting an air inlet in the middle of the second cover body and an air outlet on the outer edge, the noise is transmitted from the middle through the spiral air duct and then out from the edge, which increases the noise propagation path and allows the noise to be fully reflected in the spiral air duct and then transmitted out, thereby improving the noise reduction effect.

[0021] In an optional embodiment, an angle between an air inlet direction of the air inlet and an air outlet direction of the air outlet is γ, and the angle satisfies 0°<γ≤180°.

[0022] Beneficial effect: By setting the air inlet direction of the air inlet and the air outlet direction of the air outlet to have an angle, and the angle is greater than 0° and less than or equal to 180°, the in and out propagation direction of the sound waves can be changed, the noise can be better reflected and consumed, and the noise reduction effect can be improved.

[0023] In an optional embodiment, the base comprises:

[0024] The first cover plate is connected to the shell and is arranged between the second cover plate and the shell. The first cover plate and the second cover plate form a silencer cavity, and the silencer cavity is respectively connected to the first through hole and the air inlet of the spiral air duct. Beneficial effect: By arranging the first cover plate and the second cover plate on the base, the silencer cavity is formed between the first cover plate and the second cover plate, so that the noise of the motor can enter the silencer cavity through the first through hole. Since the cavity silencer structure has an obvious noise reduction effect on the noise source of a specific frequency band, especially when the natural frequency of the cavity silencer structure is consistent with the frequency of the peak value of the noise source of the motor, the noise reduction amplitude can be maximized, so that the motor noise entering the silencer cavity, especially the low-frequency noise peak, can be better filtered. The motor noise that is not filtered out can enter the spiral air duct on the second cover plate, and the spiral structure of the spiral air duct increases the number of reflections of sound wave propagation to reduce the total noise value of the motor, thereby making the motor noise transmitted from the ventilation hole smaller.

[0025] In an optional embodiment, the first cover plate includes:

[0026] A first cover body is provided with a second through hole, and the second through hole is communicated with the first through hole and the muffler cavity respectively.

[0027] Beneficial effect: By setting the second through hole on the first cover body, the noise transmitted through the first through hole can first enter the second through hole and then enter the silencer cavity, thereby extending the propagation path of the sound wave and improving the noise reduction effect.

[0028] In an optional embodiment, the aperture of the second through hole is larger than the aperture of the first through hole;

[0029] And / or, the radial dimension of the silencing cavity is larger than the aperture of the second through hole.

[0030] Beneficial effect: By setting the aperture of the second through hole to be larger than that of the first through hole, when the sound wave propagates from the first through hole to the second through hole, the cross-sectional size changes suddenly, so that the low-frequency noise wave can be better reflected, thereby improving the noise reduction effect.

[0031] By setting the aperture of the second through hole to be larger than the aperture of the first through hole, and making the radial dimension of the silencer cavity larger than the aperture of the second through hole, the noise undergoes two sudden changes in cross-sectional dimensions when passing through the second through hole and the silencer cavity, and the low-frequency noise waves are better reflected and finally converted into heat energy for dissipation, thereby improving the noise reduction effect. In a second aspect, the present invention also provides a base assembly, including: the above-mentioned base and a motor, wherein the motor is arranged in the accommodating cavity of the base.

[0032] Beneficial effect: Since the base assembly includes the above-mentioned base, it has the same effect as the above-mentioned base, which will not be repeated here.

[0033] In a third aspect, the present invention further provides a food processor, comprising the above-mentioned base assembly.

[0034] Beneficial effect: Since the food processor includes the above-mentioned base assembly, it has the same effect as the above-mentioned base assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 An exploded view of a base according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 A schematic structural diagram of a second cover plate of the base shown;

[0038] Figure 3 A top view of the spiral air duct of the base;

[0039] Figure 4 is a cross-sectional view of the base;

[0040] Figure 5 is a structural schematic diagram of a first cover plate of the base;

[0041] Figure 6 is a schematic diagram of the structure of the upper shell of the base;

[0042] Figure 7 is a top view of the bottom cover;

[0043] Figure 8 A top view of the second cover plate and the bottom cover being assembled.

[0044] Description of reference numerals:

[0045] 1-shell; 101-upper shell; 1011-first shell; 10111-accommodating cavity; 10112-first through hole; 10113-third through hole; 10114-bottom plate; 10115-side wall; 1012-second shell; 1013-hollow cavity; 102-bottom cover; 1021-air inlet; 1022-air outlet;

[0046] 2-first cover plate; 201-first cover body; 2011-second through hole; 202-silencing cavity; 203-first extension portion; 204-second extension portion;

[0047] 3-second cover plate; 301-spiral air duct; 3011-contraction section; 3012-expansion section; 302-second cover body; 303-air inlet; 304-air outlet. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0049] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0050] According to an embodiment of the present invention, on the one hand, a base is provided, including: a shell 1, the shell 1 is provided with a accommodating cavity 10111, a first through hole 10112 and a ventilation hole, the accommodating cavity 10111 is suitable for accommodating a motor, the first through hole 10112 is connected to the accommodating cavity 10111, and the ventilation hole is connected to the outside; a second cover plate 3, connected to the shell 1, the second cover plate 3 is provided with a spiral air duct 301, the spiral air duct 301 is provided with an air inlet 303 and an air outlet 304, the air inlet 303 is connected to the first through hole 10112, and the air outlet 304 is connected to the ventilation hole; the spiral air duct 301 is provided with at least one contraction section 3011 and an expansion section 3012 in the extension direction from the air inlet 303 to the air outlet 304, and the width of the contraction section 3011 is different from the width of the expansion section 3012.

[0051] By providing a spiral air duct 301 on the second cover plate 3 of the base, and the spiral air duct 301 is arranged to include a contraction section 3011 and an expansion section 3012 in the extending direction from the air inlet 303 to the air outlet 304, and the widths of the contraction section 3011 and the expansion section 3012 are different, when sound waves pass through the spiral air duct, they can collide with the duct walls of the contraction section 3011 and the expansion section 3012 multiple times, increasing the number of reflections of the sound waves, more effectively reducing the broadband noise of the sound waves, reducing the total noise value, making the motor noise transmitted from the ventilation holes smaller, and the noise reduction effect will not be reduced even after long-term use of this structure, greatly improving the user experience.

[0052] Specifically, there are multiple contraction sections 3011, and the widths of each of the contraction sections 3011 are different; there are multiple expansion sections 3012, and the widths of each of the expansion sections 3012 are different. By setting the contraction section 3011 and the expansion section 3012 to be multiple, and the widths of each contraction section 3011 are different, and the widths of each expansion section 3012 are different, the number of reflections of the noise can be maximally increased, the reflection consumption of the noise can be increased, and the total noise value can be reduced. As a transformable implementation manner, it can also be that there is one contraction section 3011 and one expansion section 3012, or there are two contraction sections 3011 and two expansion sections 3012, or more.

[0053] As Figure 3 shown, in order to better ensure the reflection of sound waves and improve the noise reduction effect, in this embodiment, the width of the contraction section 3011 is L1, the width of the expansion section 3012 is L2, and 1 < L2 / L1 ≤ 3 is satisfied. Specifically, the width of the contraction section 3011 should satisfy L1 > 5 mm to prevent the contraction section 3011 from being set too small and being difficult to manufacture. As a transformable implementation manner, it can also be that the widths of the contraction section 3011 and the expansion section 3012 satisfy other dimensional setting relationships, and no more restrictions are made here.

[0054] The specific setting position of the contraction section 3011 and the expansion section 3012 should be as far away from the air inlet 303 as possible, so that even if the sound wave is reflected by the wall of the contraction section 3011 and the expansion section 3012, it will stay in the spiral air duct 301. Specifically, the contraction section 3011 and the expansion section 3012 should be set as close to the air outlet 304 as possible, so as to make the last reflection barrier before the sound wave is transmitted from the spiral air duct 301. Of course, in order to prevent the sound wave from being transmitted directly from the air outlet 304, the contraction section 3011 and the expansion section 3012 can also be set in the middle of the spiral air duct 301. As a convertible embodiment, it can also be that the contraction section 3011 and the expansion section 3012 can be set at any position between the air inlet 303 and the air outlet 304 of the spiral air duct 301, as long as the sound wave is prevented from being transmitted directly from the air inlet 303 and the air outlet 304, and no excessive restrictions are made here.

[0055] like Figure 2 As shown, the second cover plate 3 includes: a second cover body 302, an air inlet 303 is provided in the middle of the second cover body 302, a spiral wind plate extends from the second cover body 302, and the spiral wind plate is arranged to form a spiral air duct 301, the spiral air duct 301 spirals out from the middle of the second cover body 302 to the edge, and the air outlet 304 is arranged at the outer edge of the second cover body 302. By arranging the air inlet 303 in the middle of the second cover body 302 and the air outlet 304 at the outer edge, the noise enters the spiral air duct 301 from the middle of the second cover body 302, flows through the spiral air duct 301, and then transmits from the edge of the second cover plate 3, thereby increasing the propagation path of the noise, so that the noise can be fully reflected in the spiral air duct 301 and then transmitted, thereby improving the noise reduction effect. As a convertible embodiment, it can also be that the air inlet 303 is arranged at one end of the second cover body 302, and the air outlet 304 is arranged at the other end of the second cover body 302.

[0056] Among them, Figure 3 As shown, the angle between the air inlet direction of the air inlet 303 and the air outlet direction of the air outlet 304 is γ, and the angle satisfies 0°<γ≤180°. By setting the air inlet direction of the air inlet 303 and the air outlet direction of the air outlet 304 to have an angle, and the angle is greater than 0° and less than or equal to 180°, the inlet and outlet propagation directions of the sound waves can be changed, the noise can be better reflected and consumed, and the noise reduction effect can be improved.

[0057] The specific angle design of the angle between the air inlet direction of the air inlet 303 and the air outlet direction of the air outlet 304 should extend the spiral air duct 301 as much as possible. In theory, the smaller γ is, the longer the spiral air duct is.

[0058] In one embodiment, the base includes: a first cover plate 2, which is connected to the shell 1, and the first cover plate 2 is arranged between the second cover plate 3 and the shell 1, and a silencer chamber 202 is formed between the first cover plate 2 and the second cover plate 3, and the silencer chamber 202 is connected to the first through hole 10112 and the air inlet 303 of the spiral air duct 301.

[0059] By arranging the first cover plate 2 and the second cover plate 3 on the base, a silencer cavity 202 is formed between the first cover plate 2 and the second cover plate 3, so that the noise of the motor can enter the silencer cavity 202 through the first through hole 10112. Since the cavity silencer structure has an obvious noise reduction effect on noise sources in a specific frequency band, especially when the natural frequency of the cavity silencer structure is consistent with the frequency of the peak value of the noise source of the motor, the noise reduction amplitude can be maximized, so that the motor noise entering the silencer cavity 202, especially the low-frequency noise peak, can be better filtered. The motor noise that is not filtered out can enter the spiral air duct 301 on the second cover plate 3, and the spiral structure of the spiral air duct 301 increases the number of reflections of sound wave propagation to reduce the total noise value of the motor, thereby making the motor noise transmitted from the ventilation hole smaller, and the long-term use of the structure will not reduce the noise reduction effect, which greatly improves the user experience. Figure 4 and Figure 5 As shown, the first cover plate 2 includes: a first cover body 201, a second through hole 2011 is provided on the first cover body 201, and the second through hole 2011 is respectively connected with the first through hole 10112 and the muffler cavity 202. By providing the second through hole 2011 on the first cover body 201, the noise transmitted through the first through hole 10112 can first enter the second through hole 2011 and then enter the muffler cavity 202, thereby extending the propagation path of the sound wave and improving the noise reduction effect.

[0060] The aperture of the second through hole 2011 is larger than the aperture of the first through hole 10112. By setting the aperture of the second through hole 2011 to be larger than the aperture of the first through hole 10112, when the sound wave propagates from the first through hole 10112 to the second through hole 2011, the cross-sectional size changes suddenly, and the low-frequency noise wave can be better reflected, thereby improving the noise reduction effect. As a convertible embodiment, the aperture of the second through hole 2011 may be the same as the aperture of the first through hole 10112, or smaller.

[0061] The radial dimension of the silencer cavity 202 in this embodiment is larger than the aperture of the second through hole 2011. Here, the radial dimension of the silencer cavity 202 refers to the diameter of the circle when the cross section of the silencer cavity 202 is circular, and the widest dimension of the non-circular when the cross section of the silencer cavity 202 is non-circular; the aperture of the second through hole 2011 is the aperture of a circular hole, and the maximum dimension of its length and width if it is a non-circular hole. By setting the aperture of the second through hole 2011 to be larger than the aperture of the first through hole 10112, the radial dimension of the silencer cavity 202 is larger than the aperture of the second through hole 2011, so that the noise undergoes two sudden changes in cross-sectional dimensions when passing through the second through hole 2011 and the silencer cavity 202, the low-frequency noise wave is better reflected and finally converted into heat energy for dissipation, thereby improving the noise reduction effect.

[0062] As a convertible embodiment, the second through hole 2011 may not be provided on the first cover body 201, but the first cover body 201 directly forms a silencer chamber 202 with the second cover plate 3, and the size of the silencer chamber 202 is larger than the aperture of the first through hole 10112. In this way, the noise entering the silencer chamber 202 through the first through hole 10112 can undergo a sudden change in cross-sectional size, thereby achieving noise reduction.

[0063] like Figure 5 As shown, the first cover plate 2 includes: a first extension portion 203, the first extension portion 203 extends from the first cover body 201 in a direction away from the second cover plate 3, and the first extension portion 203 is arranged to form a second through hole 2011; a second extension portion 204, the second extension portion 204 extends from the first cover body 201 in a direction close to the second cover plate 3, and the second extension portion 204 and the second cover plate 3 are arranged to form a muffler cavity 202. That is, the first extension portion 203 is arranged inside the first cover body 201, the second extension portion 204 is arranged outside the second cover plate 3, and the muffler cavity 202 is a cavity expanded outward by the second extension portion 204 relative to the first extension portion 203. By setting the first cover plate 2 to include the first extension portion 203 and the second extension portion 204, it is convenient to form the second through hole 2011 and the muffler cavity 202, and the structure is relatively simple. As a convertible implementation, the first cover plate 2 may include only the second extension portion 204 , and the second through hole 2011 is provided on the first cover body 201 .

[0064] For ease of manufacture, the first cover body 201, the first extension part 203 and the second extension part 204 can be integrally formed. As a convertible embodiment, the first cover body 201, the first extension part 203 and the second extension part 204 can also be separately formed.

[0065] In one embodiment, the housing 1 includes an upper shell 101 connected to a side of the first cover plate 2 away from the second cover plate 3 , and a first through hole 10112 is provided in the upper shell 101 .

[0066] like Figure 6 As shown, the upper shell 101 includes: a first shell 1011, on which a receiving cavity 10111 and a first through hole 10112 are provided; a second shell 1012, connected to the outer side of the first shell 1011, and a hollow cavity 1013 is provided between the first shell 1011 and the second shell 1012. Since the noise sound waves generated by the motor propagate in all directions, in addition to being able to propagate to the silencer chamber 202 through the first through hole 10112, they will also propagate in other directions, such as radial propagation. By setting the upper shell 101 to include a first shell 1011 and a second shell 1012, a hollow cavity 1013 is formed between the first shell 1011 and the second shell 1012. In this way, the motor noise in the accommodating cavity 10111 can be transmitted to the hollow cavity 1013 between the first shell 1011 and the second shell 1012 through the shell wall of the first shell 1011. The hollow cavity 1013 can effectively block the radial diffusion of the noise sound waves, which is beneficial to improving the sound quality and reducing the total noise value.

[0067] The first shell 1011 and the second shell 1012 are integrally formed. By integrally forming the first shell 1011 and the second shell 1012, the structure of the upper shell 101 is relatively simple. As a convertible embodiment, the first shell 1011 and the second shell 1012 can also be separately formed.

[0068] like Figure 6 As shown, the first shell 1011 is provided with a third through hole 10113, the third through hole 10113 is arranged at intervals outside the first through hole 10112, and the third through hole 10113 is communicated with the hollow cavity 1013. By providing the third through hole 10113 on the first shell 1011, and the third through hole 10113 is communicated with the hollow cavity 1013, the noise of the motor in the accommodating cavity 10111 can be transmitted through the shell wall of the first shell 1011, and can also be transmitted to the hollow cavity 1013 through the third through hole 10113, so as to better reduce the noise of the motor. At the same time, since the motor will generate a lot of heat when running at a high speed, the third through hole 10113 is provided to facilitate heat dissipation of the motor in the accommodating cavity 10111.

[0069] The first shell 1011 includes: a bottom plate 10114, on which a first through hole 10112 and a third through hole 10113 are provided; and a side wall 10115, which is formed by extending upward from the bottom plate 10114, and the bottom plate 10114 and the side wall 10115 are arranged to form an accommodating cavity 10111. By configuring the first shell 1011 to include the bottom plate 10114 and the side wall 10115, the first through hole 10112 and the accommodating cavity 10111 for accommodating the motor can be conveniently arranged on the first shell 1011, so that the structure of the housing 1 is more compact.

[0070] And due to the arrangement of the first extension portion 203 and the second extension portion 204, the second extension portion 204 expands outward relative to the first extension portion 203, so that there is a gap between the bottom plate 10114 of the first shell 1011 and the first cover body 201. The motor noise is transmitted to the gap through the third through hole 10113, and then propagates from the gap to the hollow cavity 1013 between the first shell 1011 and the second shell 1012, which can better reduce the motor noise.

[0071] In one embodiment, the housing 1 includes a bottom cover 102 , which is connected to the upper housing 101 and to a side of the second cover plate 3 away from the first cover plate 2 , and a ventilation hole is provided on the bottom cover 102 .

[0072] There are multiple ventilation holes, which are arranged at intervals on the bottom cover 102. By arranging multiple ventilation holes at intervals, it is convenient to transmit noise, and the ventilation holes can also be used as heat dissipation holes to facilitate heat dissipation of the motor.

[0073] like Figure 7 As shown, a group of ventilation holes connected to the air outlet 304 of the spiral air duct 301 can be set as the air inlet 1021, and the two groups of ventilation holes connected to the hollow cavity 1013 between the first shell 1011 and the second shell 1012 can be set as the air outlet 1022. The setting of the spiral air plate makes the air inlet 1021 and the air outlet 1022 not connected. Due to the negative pressure generated by the heat dissipation fan blades of the motor, the outside air enters the spiral air duct 301 and the muffler cavity 202 through the air inlet 1021, and then passes through the first through hole 10112 and blows toward the motor through the heat dissipation fan blades. The hot air that absorbs the heat of the motor then enters the hollow cavity 1013 between the first shell 1011 and the second shell 1012 through the third through hole 10113, and is finally discharged into the external environment through the air outlet 1022. As a convertible embodiment, it can also be that the air inlet 1021 and the air outlet 1022 are set according to actual needs, and there is no excessive restriction here.

[0074] The connection method between the various structures on the base in this embodiment refers to Figure 4 As shown, the first cover plate 2 is connected to the lower part of the upper shell 101 of the housing 1, the second cover plate 3 is connected to the lower part of the first cover plate 2, and the lower part of the second cover plate 3 is connected to the bottom cover 102 of the housing 1. Specifically, a screw column can be provided on the bottom cover 102, and matching screw holes are provided on the bottom plate 10114 of the upper shell 101, the first cover plate 2, and the second cover plate 3. The upper shell 101, the first cover plate 2, the second cover plate 3, and the bottom cover 102 can be fastened together by using a screw passing through the screw column, which greatly improves the assembly efficiency.

[0075] According to an embodiment of the present invention, on the other hand, a base assembly is provided, including: the above-mentioned base and a motor, wherein the motor is disposed in a receiving cavity 10111 of the base.

[0076] Since the base assembly includes the above-mentioned base, it has the same effect as the above-mentioned base, which will not be described in detail here.

[0077] The noise reduction principle of the silencer chamber 202 is as follows: the upper shell 101 of the base covers the entire motor in the accommodating chamber 10111, and the noise generated by the motor enters the second through hole 2011 through the first through hole 10112, and then reaches the silencer chamber 202 through the second through hole 2011. Due to the sudden change in the cross-sectional size from the first through hole 10112 to the second through hole 2011 and from the second through hole 2011 to the silencer chamber 202, part of the low-frequency noise wave is continuously reflected in the silencer chamber 202 and converted into heat energy for dissipation. The sound elimination frequency f of the silencer chamber 202 can be estimated by the following formula:

[0078]

[0079] Where: c0-sound speed in air, m / s; S-inlet and outlet cross-sectional area, m 2 ; V- chamber volume of the muffler, m 3 ; h- chamber depth or height of the silencer chamber, m. Wherein, when the cross-sectional areas of the inlet and outlet are the same, S is the inlet cross-sectional area; when the cross-sectional areas of the inlet and outlet are different, S is the average of the cross-sectional areas of the inlet and outlet; in this embodiment, the inlet of the silencer chamber 202 is the second through hole 2011, and the outlet is the air inlet 303, and the cross-sectional areas of the two are the same.

[0080] The noise sound waves of some low-frequency noise peaks are filtered out in the silencer cavity 202 and enter the spiral air duct 301 below. The motor noise propagates from the inside to the outside in the spiral air duct 301. As for the transmission direction of the sound waves, the sound waves enter from the middle air inlet 303, and are reflected and consumed by the multiple contraction air ducts and expansion air ducts in the cavity of the spiral air duct 301, and then pass through the air outlet 304 at the outer edge and the air outlet 1022 on the bottom cover 102 before entering the external environment. The spiral air duct 301 can effectively reduce the broadband noise of the motor noise source and the total noise value by reflecting and consuming the sound waves.

[0081] The noise waves generated by the motor propagate in all directions. In addition to the noise waves entering the cavity inside the base, some noise waves also propagate radially. The hollow cavity 1013 between the first shell 1011 and the second shell 1012 can effectively block the radial diffusion of the noise waves, which is beneficial to improving the sound quality and reducing the total noise value.

[0082] According to an embodiment of the present invention, on the other hand, a food processor is provided, comprising the above-mentioned base assembly.

[0083] Since the food processor includes the above-mentioned base assembly, it has the same effect as the above-mentioned base assembly, which will not be described in detail here.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A base, characterized in that: include: A housing (1), wherein the housing (1) is provided with a housing cavity (10111), a first through hole (10112) and a ventilation hole, the housing cavity (10111) being suitable for accommodating a motor, the first through hole (10112) being in communication with the housing cavity (10111), and the ventilation hole being in communication with the outside; A second cover plate (3) connected to the shell (1), the second cover plate (3) being provided with a spiral air duct (301), the spiral air duct (301) being provided with an air inlet (303) and an air outlet (304), the air inlet (303) being in communication with the first through hole (10112), and the air outlet (304) being in communication with the ventilation hole; The spiral air duct (301) is provided with at least one contraction section (3011) and one expansion section (3012) in the extension direction from the air inlet (303) to the air outlet (304), and the width of the contraction section (3011) is different from the width of the expansion section (3012).

2. The base according to claim 1, characterized in that: The width of the contraction section (3011) is L1, the width of the expansion section (3012) is L2, and 1 <L2 / L1≤3。 3. The base according to claim 2, characterized in that: The width of the contraction section (3011) satisfies L1>5mm.

4. The base according to claim 1, characterized in that: There are a plurality of contraction sections (3011), and each of the contraction sections (3011) has a different width; And / or, the expansion section (3012) is provided in plurality, and each expansion section (3012) has a different width.

5. The base according to claim 1, characterized in that: The contraction section (3011) and the expansion section (3012) are arranged close to the air outlet (304); And / or, the contraction section (3011) and the expansion section (3012) are arranged in the middle of the spiral air duct (301).

6. The base according to claim 1, characterized in that: The second cover plate (3) comprises a second cover body (302), the air inlet (303) is provided in the middle of the second cover body (302), the spiral air duct (301) spirals out from the middle of the second cover body (302) to the edge, and the air outlet (304) is provided at the outer edge of the second cover body (302).

7. The base according to claim 6, characterized in that: The included angle between the air inlet direction of the air inlet (303) and the air outlet direction of the air outlet (304) is γ, and the included angle satisfies 0°<γ≤180°.

8. The base according to any one of claims 1 to 7, characterized in that: The base comprises: The first cover plate (2) is connected to the shell (1) and is arranged between the second cover plate (3) and the shell (1); a silencer chamber (202) is formed between the first cover plate (2) and the second cover plate (3); the silencer chamber (202) is respectively connected to the first through hole (10112) and the air inlet (303) of the spiral air duct (301).

9. The base according to claim 8, characterized in that: The first cover plate (2) comprises: A first cover body (201), wherein the first cover body (201) is provided with a second through hole (2011), and the second through hole (2011) is respectively connected to the first through hole (10112) and the muffler chamber (202).

10. The base according to claim 9, characterized in that: The aperture of the second through hole (2011) is larger than the aperture of the first through hole (10112); And / or, the radial dimension of the muffler cavity (202) is greater than the aperture of the second through hole (2011).

11. A base assembly, characterized in that: include: The base according to any one of claims 1 to 10; The motor is arranged in the accommodating cavity (10111) of the base.

12. A food processor, characterized in that: Includes the base assembly of claim 11.

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