Silencer, noise reduction gas circuit device and massage chair

Abstract

The utility model discloses a silencer, noise reduction gas circuit device and massage armchair, the silencer comprises an expansion pipe and a corrugated pipe, the expansion pipe is internally provided with an expansion cavity, the corrugated pipe is arranged in the expansion cavity in a penetrating manner, the corrugated pipe is provided with a plurality of first chambers and a plurality of second chambers, the first chambers are distributed at intervals along the extension track of the corrugated pipe, and the second chambers are distributed at intervals along the extension track of the corrugated pipe. Each second chamber is arranged between every two adjacent first chambers, and the radial sectional area of each first chamber is larger than that of each second chamber; a through hole is formed in the circumferential outer wall of each first cavity, a third cavity is defined by the outer wall of the corrugated pipe and the inner wall of the expansion cavity, the first cavities and the third cavity are communicated through the through holes, a Helmholtz resonant cavity is jointly formed by the first cavities, the second cavities and the third cavity, and the cross sectional area of the transmission channel is discontinuous, so that the transmission efficiency is improved. The sound waves transmitted in the pipeline form different transmission speeds, densities and directions, so that impedance mismatch is generated, downstream transmission of sound wave energy is hindered, and the silencing capacity is good.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction, in particular to a muffler, a noise reduction air path device and a massage chair. Background Art

[0002] With the continuous advancement of modern intelligent technology, the development of intelligence has become a trend. People have higher requirements for office or life quality, and smart airbag chairs have come into being. Smart airbag chairs can change the shape of the seat back through the inflation and deflation of multiple airbags, effectively reducing the pressure on the user's spine caused by long-term sitting. They can also reflect the user's behavior through indicators such as sitting time and posture, reminding users to correct their sitting posture, and promoting the development of psychological and physical health. However, the air pump group used in the existing airbags has a large gas flow rate per unit time and a high inflation and deflation frequency, so it will produce obvious noise during its operation. Utility Model Content

[0003] The utility model aims to provide a muffler, a noise reduction air path device and a massage chair, aiming to solve the problem that the air pump group used in the existing airbag has a large gas flow rate per unit time and a fast filling and deflation frequency, so obvious noise is generated during its operation.

[0004] In a first aspect, the utility model provides a muffler, the muffler comprising an expansion tube and a bellows, the expansion tube is provided with an expansion cavity, the bellows is arranged in the expansion cavity, the bellows is provided with a plurality of first chambers and a plurality of second chambers, each of the first chambers is spaced apart along an extension track of the bellows, each of the second chambers is respectively arranged between two adjacent first chambers and is used to connect two adjacent first chambers, wherein the radial cross-sectional area of ​​the first chamber is greater than the radial cross-sectional area of ​​the second chamber;

[0005] The circumferential outer wall of each of the first chambers is provided with a perforation, the outer wall of the bellows and the inner wall of the expansion chamber are combined to form a third chamber, and the perforation connects the first chamber and the third chamber.

[0006] In one embodiment, the inner wall of the expansion cavity is a wavy structure.

[0007] In one embodiment, the expansion tube includes a tube shell and an inner liner sleeved inside the tube shell, and the inner liner is a wavy structure; and / or,

[0008] A sound absorbing layer formed by sound absorbing material is attached to the inner wall of the expansion cavity.

[0009] In the second aspect, the utility model also provides a noise reduction air circuit device, which includes an air pump assembly, a pipeline assembly, an air bag assembly and a muffler of any of the above embodiments, wherein the pipeline assembly connects the air pump assembly and the air bag assembly, and the muffler is installed on the pipeline assembly.

[0010] In one embodiment, the noise reduction air path device further includes a sound absorbing sleeve, which is sleeved on the outside of the air pump assembly; the sound absorbing sleeve is a honeycomb cotton sleeve, and the inner wall of the sound absorbing sleeve is formed with a wavy structure; and / or,

[0011] The muffler is installed at the end of the exhaust pipe of the pipeline assembly.

[0012] In one embodiment, the noise reduction air circuit device further includes a sound absorbing nozzle, which is installed on the airbag assembly and is connected to the pipeline assembly;

[0013] The sound-absorbing nozzle includes an air nozzle body and a sound-absorbing sponge. The air nozzle body is arranged to penetrate the airbag wall of the airbag assembly and is provided with an external air port arranged on the outside of the airbag of the airbag assembly and an internal air port arranged in the inner cavity of the airbag of the airbag assembly. The external air port is connected to the pipeline assembly, and the sound-absorbing sponge is attached to the internal air port.

[0014] In one embodiment, the noise-absorbing sponge is hemispherical, and the noise-absorbing sponge has a plane wall attached to the inner air port, and a hemispherical wall facing the airbag inner cavity of the airbag assembly;

[0015] The sound absorbing nozzle further comprises a film, which covers the hemispherical wall and is connected to the air nozzle body so as to mount the sound-absorbing sponge on the air nozzle body, and a plurality of through holes are formed on the film.

[0016] In a third aspect, the utility model further provides a massage chair, comprising a chair body and the noise reduction air path device of any one of the above embodiments.

[0017] In one embodiment, the airbag assembly includes a first airbag, a second airbag, a third airbag, a fourth airbag, a fifth airbag and a sixth airbag, the first airbag is installed at the upper part of the chair body and is used to massage the cervical vertebrae, the second airbag is installed below the first airbag and is used to massage the upper back, the third airbag is installed below the second airbag and is used to massage the lower back, the sixth airbag is installed below the third airbag and is used to massage the coccyx, the fourth airbag is also installed at the position of the third and sixth airbags, the fourth airbag is used to massage the waist, and two fifth airbags are provided, which are respectively provided on both sides of the fourth airbag so as to be able to massage the sides of the waist.

[0018] In one embodiment, the noise reduction air path device further includes a valve assembly and a sensor assembly, and the valve assembly includes a first valve, a second valve, a third valve, and a fourth valve;

[0019] The first valve includes a valve port 11 and a valve port 12 connected to the air pump assembly, and a valve port 13 connected to the second valve, the first airbag, the third airbag and the fifth airbag; the second valve includes a valve port 21 connected to the valve port 13, and a valve port 22 connected to the exhaust port; the third valve includes a valve port 31 and a valve port 32 connected to the air pump assembly, and a valve port 33 connected to the fourth valve, the sixth airbag, the second airbag and the fourth airbag; the fourth valve includes a valve port 41 connected to the valve port 33, and a valve port 42 connected to the exhaust port;

[0020] The sensor assembly includes a first sensor, a second sensor, a third sensor and a fourth sensor. The first sensor is installed between the first airbag and the one-three valve port, the second sensor is installed between the fifth airbag and the one-three valve port, the third sensor is installed between the sixth airbag and the three-three valve port, and the fourth sensor is installed between the fourth airbag and the three-three valve port.

[0021] The following beneficial effects are achieved by using the embodiments of the present invention:

[0022] With the muffler of the utility model, each first chamber is spaced along the extension track of the bellows, each second chamber is respectively arranged between two adjacent first chambers and is used to connect the two adjacent first chambers, the radial cross-sectional area of ​​the first chamber is larger than the radial cross-sectional area of ​​the second chamber, and the circumferential outer wall of each first chamber is provided with a perforation, which connects the first chamber and the third chamber, so that the first chamber, the second chamber and the third chamber together constitute a Helmholtz resonance cavity, and the cross-sectional area of ​​the transmission channel is discontinuous, so that the sound waves propagating in the pipeline form different propagation speeds, densities and directions, thereby generating impedance mismatch, causing part of the sound waves to be reflected back to the sound source or reflected back and forth inside the muffler, hindering the sound wave energy from propagating downstream, and having better silencing ability. The above-mentioned muffler is applied to a noise reduction air path device and a massage chair. Since the muffler has a better silencing ability, it can provide a better silencing effect for the noise reduction air path device and the massage chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] in:

[0025] Figure 1 The figure is a schematic diagram of a noise reduction air path device in a massage chair according to an embodiment.

[0026] Figure 2 for Figure 1 Schematic diagram of the arrangement of airbag components in a massage chair.

[0027] Figure 3 for Figure 1 Schematic diagram of the muffler in the noise reduction gas circuit device shown.

[0028] Figure 4 for Figure 3 Exploded view of the muffler shown.

[0029] Figure 5 This is an enlarged schematic diagram of part A in 4.

[0030] Figure 6 for Figure 3 Side view of the muffler shown.

[0031] Figure 7 for Figure 6 Middle BB section view.

[0032] Figure 8 for Figure 7 Enlarged schematic diagram of part D in the middle.

[0033] Fig. 9 for Figure 6 Middle CC section view.

[0034] Fig.10 for Fig. 9 Enlarged schematic diagram of part E in the middle.

[0035] Fig.11 for Figure 3 A cross-sectional view of the expansion tube in the muffler shown.

[0036] Fig.12 for Figure 1 Schematic diagram of the sound absorbing nozzle in the noise reduction air path device shown.

[0037] Fig.13 for Fig.12 A top view of the sound absorbing nozzle shown.

[0038] Fig.14 for Fig.13 Middle FF cross-sectional view.

[0039] Fig.15 for Figure 1 Schematic diagram of the sound-absorbing sleeve in the noise reduction air path device shown.

[0040] Fig.16 for Fig.15 A cross-sectional view of the sound absorbing sleeve is shown.

[0041] Fig.17 for Fig.15 A schematic diagram of the first side shell of the sound-absorbing sleeve is shown.

[0042] Fig.18 for Fig.15 A schematic diagram of the second side shell of the sound-absorbing sleeve is shown.

[0043] Figure numbers: 100, expansion tube; 110, expansion cavity; 120, third chamber; 130, tube shell; 140, lining; 141, sound absorbing layer; 200, bellows; 210, first chamber; 211, perforation; 220, second chamber; 300, sound absorbing sleeve; 310, first side shell; 320, second side shell; 400, sound absorbing nozzle; 410, air nozzle body; 411, external air port; 412, internal air port; 420, sound absorbing sponge; 430, film; 431, through hole; 510, first air bag; 520, second air bag; 530, third air bag; 540, fourth Airbag; 550, fifth airbag; 560, sixth airbag; 610, first valve; 620, second valve; 630, third valve; 640, fourth valve; 710, first sensor; 720, second sensor; 730, third sensor; 740, fourth sensor; 810, first three-way pipe; 820, second three-way pipe; 830, third three-way pipe; 840, fourth three-way pipe; 850, fifth three-way pipe; 860, sixth three-way pipe; 870, seventh three-way pipe; 880, eighth three-way pipe; 890, ninth three-way pipe; 910, air pump assembly; 920, exhaust port. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0047] The present invention provides a massage chair, which is mainly used to massage the user. Figure 1 and Figure 2 A massage chair of one embodiment includes a chair body and a noise reduction air circuit device, which includes an air pump assembly 910, a pipeline assembly, an air bag assembly and a muffler. The pipeline assembly connects the air pump assembly 910 and the air bag assembly, and the muffler is installed on the pipeline assembly to muffle the pipeline.

[0048] In this embodiment, please refer to Figures 3 to 11 The muffler includes an expansion tube 100 and a bellows 200. The expansion tube 100 is provided with an expansion cavity 110. The bellows 200 is inserted into the expansion cavity 110. The bellows 200 is provided with a plurality of first chambers 210 and a plurality of second chambers 220. Each first chamber 210 is spaced along the extension track of the bellows 200. Each second chamber 220 is respectively provided between two adjacent first chambers 210 and is used to connect the two adjacent first chambers 210. The radial cross-sectional area of ​​the first chamber 210 is greater than the radial cross-sectional area of ​​the second chamber 220. The circumferential outer wall of each first chamber 210 is provided with a perforation 211. The outer wall of the bellows 200 and the inner wall of the expansion cavity 110 enclose a third chamber 120. The perforation 211 connects the first chamber 210 and the third chamber 120. Specifically, a plurality of perforations 211 are provided, and a plurality of perforations 211 are spaced on the circumferential outer wall of each first chamber 210.

[0049] It is understandable that the noise is usually more serious pneumatic noise, which is generated by turbulent motion or the interaction between gas and the surface of an object. In this embodiment, the first chamber 210, the second chamber 220 and the third chamber 120 together form a Helmholtz resonance cavity. The cross-sectional area of ​​the transmission channel is discontinuous, so that the sound waves propagating in the pipeline form different propagation speeds, densities and directions, thereby generating impedance mismatch, causing part of the sound waves to be reflected back to the sound source or reflected back and forth inside the muffler, hindering the propagation of the sound wave energy downstream, and having a good silencing ability. The above-mentioned muffler is applied to a massage chair. Since the muffler has a good silencing ability, it can provide a good silencing effect for the massage chair, thereby realizing that people can use the massage chair while isolating the noise of the air pump in the air circuit. While enjoying the convenience and services brought by the massage chair, the noise will not affect their daily study, work and life.

[0050] In one embodiment, see Figures 3 to 11 The inner wall of the expansion cavity 110 is a wavy structure. The above arrangement can change the shape of the silencer interface to avoid forming a large plane. At the same time, the wavy structure as a reinforcing rib can increase the natural frequency of the structure, thereby improving the silencer effect by combining the expansion silencer principle with the resonance silencer principle.

[0051] Furthermore, in the present embodiment, the expansion tube 100 includes a tube shell 130, and an inner liner 140 mounted on the inner side of the tube shell 130, the inner liner 140 is a wavy structure, and the inner wall of the tube shell 130 and the inner liner 140 are enclosed to form a buffer cavity. Through the above-mentioned double-layer plate-like structural setting, the liner 140 is a wavy structure setting, which has better sound absorption performance, and the wavy structure helps to improve the pressure fluctuation of the turbulent interface and suppress the generation of vortex noise.

[0052] Furthermore, in this embodiment, the inner wall of the expansion chamber 110 is attached with a sound absorbing layer 141 formed of a sound absorbing material. Specifically, the sound absorbing layer 141 is formed on the inner lining 140. By setting the sound absorbing layer 141, the radiated noise can be well reduced. The above-mentioned setting can solve the disadvantage that the wall panel of the expansion chamber 110 is easily excited to generate radiated noise when high-speed airflow passes through. Through the setting of the silencer of this embodiment, the silencer has a simple structure, a high sound attenuation and a small airflow pressure loss. Of course, in other embodiments, the inner wall of the expansion chamber 110 can also be a smooth surface.

[0053] In one embodiment, the muffler is installed at the end of the exhaust pipe of the pipeline assembly, so as to facilitate the muffler of the pipeline assembly. The muffler of this embodiment is a Helmholtz-type corrugated perforated 211 tube resistance muffler, which has the characteristics of simple structure, good broadband performance, long service life, etc., and can be widely used in the noise control of air pump airbag systems. Compared with the resistive muffler, the resistive muffler can better reduce the loss of flow pressure.

[0054] By setting the Helmholtz resonance cavity in this embodiment, the airflow in the muffler flows through different sections of the pipeline, resulting in a sudden change in cross-sectional area, that is, a change in acoustic impedance causes the sound waves propagating along the pipeline to be reflected back in the direction of the sound source or reflected back and forth inside the muffler. By utilizing the length of the expansion cavity 110 and the bellows 200, under ideal conditions, the forward propagating wave and the sound wave reflected from different interfaces of the pipeline are 180° out of phase, so that the two have equal amplitudes and opposite phases, and interfere with each other.

[0055] In one embodiment, see Figure 2 , Figures 15 to 18 The noise reduction air circuit device also includes a sound absorbing sleeve 300, which is sleeved on the outside of the air pump assembly 910; the sound absorbing sleeve 300 is a honeycomb cotton sleeve, which is a sound absorbing structure made of porous materials, and the inner wall of the sound absorbing sleeve 300 is formed with a wavy structure, so that not only the muffler is used to reduce the noise of the pipeline assembly, that is, the noise of the propagation path of the air circuit is reduced, but also the sound absorbing sleeve 300 is used to reduce the noise of the air pump assembly 910, that is, the noise source can be reduced. Specifically, the sound absorbing sleeve 300 includes a first side shell 310 and a second side shell 320, and the first side shell 310 and the second side shell 320 are detachably connected.

[0056] It is understandable that the air pump assembly 910 will generate noise when it is working. The frequency of the air pump noise is mainly low-frequency. Long-term exposure to low-frequency noise will cause tension in the human body's sympathetic nerves, leading to tachycardia, increased blood pressure, endocrine disorders, and may also cause neurosis such as neurasthenia and insomnia.

[0057] Since the sound-absorbing sleeve 300 of this embodiment adopts a combination of porous materials and resonant sound-absorbing structures to construct a combined sound-absorbing structure, the sound wave propagation path and pore structure of the sound-absorbing sleeve 300, and the special layered porous structure, make the sound waves repeatedly subject to friction and collision of the internal fiber interface, porous sponge interface and sponge pore size during the propagation process, and part of the sound wave energy is converted into internal energy, and multiple reflections, refractions and damping vibrations weaken the sound wave vibration. Compared with a single porous material structure, the volume proportion of the porous material in the sound-absorbing material and the sound wave contact area are changed by the wavy structure, and the sound-absorbing sleeve 300 achieves excellent mechanical bearing performance and low-frequency broadband sound absorption and noise reduction functions without affecting the air pump inflation and deflation unit time flow.

[0058] In one embodiment, see Figure 12 to Figure 14The noise reduction air path device also includes a sound absorbing nozzle 400, which is installed on the airbag assembly and connected with the pipeline assembly; the sound absorbing nozzle 400 includes an air nozzle body 410 and a sound-absorbing sponge 420, the air nozzle body 410 is arranged to penetrate the airbag wall of the airbag assembly, and is provided with an external air port 411 arranged on the outside of the airbag of the airbag assembly, and an internal air port 412 arranged in the inner cavity of the airbag of the airbag assembly, the external air port 411 is connected with the pipeline assembly, and the sound-absorbing sponge 420 is attached to the internal air port 412.

[0059] It is understandable that the noise reduction structure of the sound absorbing nozzle 400 can better absorb high-frequency noise than simply adding sound-absorbing cotton to the straight-through pipe of the air path, thereby forming a wide-band absorber without blocking the air path. By setting the hemispherical sound-absorbing sponge 420 at the end of the air path, the sound-absorbing sponge 420 has strong resilience and tensile strength, can effectively reduce shock and protect equipment, and is heat-insulating and flame-retardant, which can better help control and maintain the temperature of the airbag.

[0060] Furthermore, in the present embodiment, the silencer sponge 420 is hemispherical, and has a planar wall attached to the inner air port 412, and a hemispherical wall facing the inner cavity of the airbag of the airbag assembly; the sound-absorbing nozzle 400 also includes a film 430, which covers the hemispherical wall and is connected to the air nozzle body 410 to install the silencer sponge 420 on the air nozzle body 410, and a plurality of through holes 431 are formed on the film 430.

[0061] Specifically, the sound-absorbing nozzle 400 is welded to the inner wall of the airbag by high-frequency ultrasonic wave welding, the sound-absorbing sponge 420 is a honeycomb sound-absorbing sponge, and the film 430 is a TPU blister film 430. In order to eliminate the injection noise and impact noise at the exhaust hole at the end of the air path, the sound-absorbing nozzle 400 of this embodiment is used as an absorber. The sound wave propagation path and pore structure of the sound-absorbing nozzle 400, and the special layered porous structure, make the sound waves repeatedly subjected to friction and collision of the internal fiber interface, the porous sponge interface and the sponge pore diameter during the propagation process, and the sound wave energy is partially converted into internal energy. Multiple reflections, refractions and damping vibrations weaken the sound wave vibration. The sound-absorbing nozzle 400 achieves excellent mechanical bearing performance and low-frequency broadband sound absorption and noise reduction functions without affecting the air pump inflation and deflation flow rate per unit time.

[0062] In one embodiment, see Figure 2The airbag assembly includes a first airbag 510, a second airbag 520, a third airbag 530, a fourth airbag 540, a fifth airbag 550 and a sixth airbag 560. The first airbag 510 is installed on the upper part of the chair body and is used to massage the cervical vertebrae. The second airbag 520 is installed below the first airbag 510 and is used to massage the upper side of the back. The third airbag 530 is installed below the second airbag 520 and is used to massage the lower side of the back. The sixth airbag 560 is installed below the third airbag 530 and is used to massage the coccyx. A fourth airbag 540 is also installed at the position of the third airbag 530 and the sixth airbag 560. The fourth airbag 540 is used to massage the waist. Two fifth airbags 550 are provided and are respectively arranged on both sides of the fourth airbag 540 to massage the side of the waist. By inflating and deflating the above airbags, the user can be massaged.

[0063] In one embodiment, see Figure 1 and Figure 2 The noise reduction air path device also includes a valve assembly and a sensor assembly, and the valve assembly includes a first valve 610, a second valve 620, a third valve 630 and a fourth valve 640; the first valve 610 includes a valve port 11 and a valve port 12 connected to the air pump assembly 910, and a valve port 13 connected to the second valve 620, the first airbag 510, the third airbag 530 and the fifth airbag 550; the second valve 620 includes a valve port 21 connected to the valve port 13, and a valve port 22 connected to the exhaust port 920; the third valve 630 includes a valve port 31 and a valve port 32 connected to the air pump assembly 910, and a valve port 33 connected to the fourth valve 640, the sixth airbag 560, the second airbag 520 and the fourth airbag 540; the fourth valve 640 includes a valve port 41 connected to the valve port 33, and a valve port 42 connected to the exhaust port 920. Specifically, the first valve 610 and the third valve 630 are both three-way solenoid valves, and the second valve 620 and the fourth valve 640 are both two-way solenoid valves. By setting the above valves, the inflation and deflation of each airbag can be controlled. Among them, the first and second valve ports of the first valve 610 and the third and second valve ports of the third valve 630 are both connected to the exhaust port 920, so that the third airbag 630 is deflated through the first valve 610, and the second airbag 520 is deflated through the third valve 630.

[0064] Furthermore, the sensor assembly includes a first sensor 710, a second sensor 720, a third sensor 730 and a fourth sensor 740. The first sensor 710 is installed between the first airbag 510 and the one-three valve port, the second sensor 720 is installed between the fifth airbag 550 and the one-three valve port, the third sensor 730 is installed between the sixth airbag 560 and the three-three valve port, and the fourth sensor 740 is installed between the fourth airbag 540 and the three-three valve port. By setting the above sensors, the gas pressure of each airbag can be sensed.

[0065] Further, the pipeline assembly includes a first three-way pipe 810, a second three-way pipe 820, a third three-way pipe 830, a fourth three-way pipe 840, a fifth three-way pipe 850, a sixth three-way pipe 860, a seventh three-way pipe 870, an eighth three-way pipe 880 and a ninth three-way pipe 890.

[0066] The first three-way pipe 810 includes a first pipe port connected to the air pump assembly 910, a second pipe port connected to the first valve port of the first valve 610, and a third pipe port connected to the third valve port of the third valve. The second three-way pipe 820 includes a second pipe port connected to the first valve port of the first valve 610, a second pipe port connected to the second valve port of the second valve 620, and a second pipe port connected to the third three-way pipe 830. The third three-way pipe 830 is connected to the third valve port of the third valve. The fourth three-way pipe 840 includes a three-one pipe port connected to the second three-way pipe port, a three-two pipe port connected to the first airbag 510, and a three-three pipe port connected to the first sensor 710. The fourth three-way pipe 840 includes a four-one pipe port connected to the first three-way valve port 610, a four-two pipe port connected to the second one-way valve port of the second valve 620, and a four-three pipe port connected to the fifth three-way pipe 850. The fifth three-way pipe 850 includes a five-one pipe port connected to the four-three pipe port, The fifth two-way pipe port connected to the fifth airbag 550, and the fifth three-way pipe port connected to the second sensor 720, the sixth three-way pipe 860 includes a sixth one-way pipe port connected to the third three-way valve port of the third valve 630, a sixth two-way pipe port connected to the fourth one-way valve port of the fourth valve 640, and a sixth three-way pipe port connected to the seventh three-way pipe 870, the seventh three-way pipe 870 includes a seventh one-way pipe port connected to the sixth three-way pipe port, and a seventh two-way pipe port connected to the sixth airbag 560, And the seven-three pipe outlet connected to the third sensor 730, the eighth three-way pipe 880 includes the eight-one pipe outlet connected to the three-three valve outlet of the third valve 630, the eight-two pipe outlet connected to the four-one valve outlet of the fourth valve 640, and the eight-three pipe outlet connected to the ninth three-way pipe 890, the ninth three-way pipe 890 includes the nine-one pipe outlet connected to the eight-three pipe outlet, the nine-two pipe outlet connected to the fourth airbag 540, and the nine-three pipe outlet connected to the fourth sensor 740.

[0067] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A muffler, It is characterized in that The muffler comprises an expansion tube and a bellows, wherein the expansion tube is provided with an expansion cavity, the bellows is arranged in the expansion cavity, the bellows is provided with a plurality of first chambers and a plurality of second chambers, each of the first chambers is spaced apart along an extension track of the bellows, each of the second chambers is respectively arranged between two adjacent first chambers and is used to connect two adjacent first chambers, wherein the radial cross-sectional area of ​​the first chamber is greater than the radial cross-sectional area of ​​the second chamber; The circumferential outer wall of each of the first chambers is provided with a perforation, the outer wall of the bellows and the inner wall of the expansion chamber are combined to form a third chamber, and the perforation connects the first chamber and the third chamber.

2. The muffler according to claim 1, It is characterized in that The inner wall of the expansion cavity is a wave-shaped structure.

3. The muffler according to claim 2, It is characterized in that The expansion tube comprises a tube shell and an inner liner sleeved inside the tube shell, wherein the inner liner is a wavy structure; and / or, A sound absorbing layer formed by sound absorbing material is attached to the inner wall of the expansion cavity.

4. A noise reduction air path device, It is characterized in that The noise reduction air circuit device comprises an air pump assembly, a pipeline assembly, an air bag assembly and the muffler according to any one of claims 1 to 3, the pipeline assembly connects the air pump assembly and the air bag assembly, and the muffler is installed on the pipeline assembly.

5. The noise reduction air path device according to claim 4, It is characterized in that The noise reduction air path device further comprises a sound absorbing sleeve, which is sleeved on the outside of the air pump assembly; the sound absorbing sleeve is a honeycomb cotton sleeve, and the inner wall of the sound absorbing sleeve is formed with a wavy structure; and / or, The muffler is installed at the end of the exhaust pipe of the pipeline assembly.

6. The noise reduction air path device according to claim 4, It is characterized in that The noise reduction air circuit device further comprises a sound absorbing nozzle, which is mounted on the air bag assembly and is connected to the pipeline assembly; The sound-absorbing nozzle includes an air nozzle body and a sound-absorbing sponge. The air nozzle body is arranged to penetrate the airbag wall of the airbag assembly and is provided with an external air port arranged on the outside of the airbag of the airbag assembly and an internal air port arranged in the inner cavity of the airbag of the airbag assembly. The external air port is connected to the pipeline assembly, and the sound-absorbing sponge is attached to the internal air port.

7. The noise reduction air path device according to claim 6, It is characterized in that The noise-absorbing sponge is hemispherical, and has a plane wall attached to the inner air port, and a hemispherical wall facing the airbag inner cavity of the airbag assembly; The sound absorbing nozzle further comprises a film, which covers the hemispherical wall and is connected to the air nozzle body so as to mount the sound-absorbing sponge on the air nozzle body, and a plurality of through holes are formed on the film.

8. A massage chair, It is characterized in that The massage chair comprises a chair body and the noise reduction air path device according to any one of claims 4 to 7.

9. The massage chair according to claim 8, It is characterized in that The airbag assembly includes a first airbag, a second airbag, a third airbag, a fourth airbag, a fifth airbag and a sixth airbag. The first airbag is installed at the upper part of the chair body and is used to massage the cervical vertebrae. The second airbag is installed below the first airbag and is used to massage the upper back. The third airbag is installed below the second airbag and is used to massage the lower back. The sixth airbag is installed below the third airbag and is used to massage the coccyx. The fourth airbag is also installed at the position of the third and sixth airbags. The fourth airbag is used to massage the waist. Two fifth airbags are provided and are respectively arranged on both sides of the fourth airbag so as to be able to massage the sides of the waist.

10. The massage chair according to claim 9, It is characterized in that The noise reduction air circuit device further comprises a valve assembly and a sensor assembly, wherein the valve assembly comprises a first valve, a second valve, a third valve and a fourth valve; The first valve includes a valve port 11 and a valve port 12 connected to the air pump assembly, and a valve port 13 connected to the second valve, the first airbag, the third airbag and the fifth airbag; the second valve includes a valve port 21 connected to the valve port 13, and a valve port 22 connected to the exhaust port; the third valve includes a valve port 31 and a valve port 32 connected to the air pump assembly, and a valve port 33 connected to the fourth valve, the sixth airbag, the second airbag and the fourth airbag; the fourth valve includes a valve port 41 connected to the valve port 33, and a valve port 42 connected to the exhaust port; The sensor assembly includes a first sensor, a second sensor, a third sensor and a fourth sensor. The first sensor is installed between the first airbag and the one-three valve port, the second sensor is installed between the fifth airbag and the one-three valve port, the third sensor is installed between the sixth airbag and the three-three valve port, and the fourth sensor is installed between the fourth airbag and the three-three valve port.

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