CN113284478B

CN113284478B - Differential pressure self-adaptive massage chair muffler

Info

Publication number: CN113284478B
Application number: CN202110425790.8A
Authority: CN
Inventors: 侯亮; 胡学满; 卜祥建; 陈云; 陈泽波
Original assignee: Xiamen University
Current assignee: Xiamen University
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2024-05-17
Anticipated expiration: 2041-04-20
Also published as: CN113284478A

Abstract

The invention belongs to the technical field of massage armchair noise elimination, and particularly discloses a differential pressure self-adaptive massage armchair muffler which can perform self-adaptive adjustment for the exhaust process of a massage armchair from dynamic transition to steady state in a short time, and realizes pressure balance control and floating change of the cavity size of each expansion cavity of a cylinder body through spring reset force and differential pressure at two sides of a perforated pipe assembly. Meanwhile, an assembled structure and an adjusting structure are adopted to respectively realize replacement of the perforated pipe and pre-adjustment of the volume of the cavity. The silencer is flexible in structure, the position of the inner valve core is adjusted according to the working mode of the massage armchair, the pressure of the whole exhaust process is adjusted in a self-adaptive mode, and the silencer has the advantages of convenience in disassembly and assembly, low maintenance cost, adjustable back pressure and gas flow area, large transmission loss and the like.

Description

Differential pressure self-adaptive massage chair muffler

Technical Field

The invention relates to a massage chair, in particular to a muffler of the massage chair.

Background

In recent years, the demand of people for electric massage chairs is increasing, and the working performance and the use comfort of the massage chairs are the focus of people. In order to enhance the massage experience, more air bags are required to be arranged to realize the pressing of various body parts such as the waist, the back, the arms, the legs, the buttocks and the like, and meanwhile, the larger air bags are required to be designed to meet the pressing force required by groups of different sizes. The increase of the number of the air bags and the size of the air bags can improve the air intake and exhaust capacity of the electric air pump, and the increase of the air exhaust capacity can bring about the problem of exhaust noise rise in the same time, thereby affecting the massage experience. At present, the common massage chairs on the market have few researches on the control of exhaust noise, and the exhaust noise suppression effect is not good because the quick and sufficient exhaust is realized by changing the geometric dimension of an exhaust pipe or the shape of an exhaust nozzle and other simple modes. The silencing cylinder silencing is used as one of the silencing methods widely applied at present, and can effectively weaken pipeline propagation noise while guaranteeing gas circulation. The types of mufflers are mainly three types: resistive mufflers, and compound mufflers, the latter two forms of muffler being the most common.

The resistive muffler generally consists of a cylinder body, a perforated pipe, a partition plate and the like, and utilizes the mutation of the sectional area of a pipeline to change the acoustic impedance, so that the acoustic wave is reflected, interfered and the like in an internal cavity. In the process, the energy of the gas is continuously dissipated, and the noise reduction effect can be achieved by improving the transmission loss. However, the dissipation of energy can generate adverse backflow and vortex at the interaction place of the gas and the wall surface, so that the static pressure of the internal cavity is increased, larger pressure loss is generated, and the exhaust efficiency is reduced.

In theory, the noise passing frequency can be changed by arranging a plurality of expansion chambers on the muffler, so that the sound attenuation quantity is improved. When the flow speed of the gas is higher, the regeneration noise is more easy to generate, and the inner diaphragm of the muffler resonates under the excitation action of the gas flow. Therefore, reasonable silencing cavities are arranged in a limited space, and meanwhile, the resonance frequency of the inner membrane avoids the air frequency, so that noise can be reduced to a certain extent.

The silencer structural design is mainly designed in an integrated mode, only can noise elimination under a specific noise background be achieved under a single design scheme, and once a certain component in the silencer structural design is damaged, disassembly, assembly and maintenance are not easy. The long-term use can cause accumulated dirt and inconvenient cleaning. In summary, the overall maintenance costs of the muffler are high.

And the single muffler is adopted for carrying out simultaneous exhaust of multiple air pumps, the gases are easy to mutually disturb, and the exhaust efficiency is low. If a plurality of mufflers are arranged, the occupied space is large and the installation is inconvenient.

Disclosure of Invention

The invention aims to provide a pressure difference self-adaptive massage armchair muffler. The muffler is suitable for a scene of simultaneous exhaust of multiple air pumps in a short time, has the advantages of adjustable and controllable cavity volume, adjustable flow cross section, small internal pressure difference and impact, high exhaust efficiency and the like, and is suitable for the noise elimination of various frequency bands.

In order to meet the technical requirements, the invention is realized by adopting the following technical scheme:

A differential pressure adaptive massage chair muffler comprising: a main body; the main body is formed by splicing a first cylinder body and a second cylinder body, the first end cover and the second end cover are installed on two sides of the main body in the axial direction through threaded connection, the second end cover is a fixed side, and the second end cover is horizontally fixed on the massage chair body through screws;

The first cylinder body and the second cylinder body are spliced inside to form a muffler cavity; a piston is arranged at one end, close to the first end cover, of the muffler cavity, a first large spring seat is embedded on the piston, and the first large spring seat has a rotational degree of freedom relative to the piston; one end of the large spring is arranged on the first large spring seat, and the other end extends towards the second end cover and is arranged on the second large spring seat; the second big spring seat is fixed on the outer perforated pipe base;

The side, facing the first end cover, of the second end cover is provided with a second small spring seat, the side, facing the first end cover, of the valve core main body is also provided with a centering block, the centering block is connected with the first small spring seat, and a small spring is arranged between the first small spring seat and the second small spring seat;

A perforated pipe is arranged between the outer perforated pipe base and the valve core main body; the outer perforated pipe is embedded in the outer perforated pipe base in a clamping groove mode, and the inner perforated pipe and the valve core main body are integrated;

an expansion cavity I is formed between the piston and the outer perforated pipe base, an expansion cavity II is formed between the outer perforated pipe base and the valve core main body, and an expansion cavity III is formed between the valve core main body and the second end cover; one side of the piston facing the first end cover is connected with a threaded rod, and the threaded rod rotates to control the position of the piston so as to change the volume of each expansion cavity;

The side wall of the second cylinder body is provided with back pressure regulating holes I at intervals along the circumferential direction, the back pressure regulating holes I are communicated with the valve core to perform partial gas pre-release when the pressure of the expansion cavity II is overlarge, and the back pressure regulating holes I assist in exhausting when the pressure of the expansion cavity III is overlarge.

In a preferred embodiment: the first cylinder is assembled with the second cylinder through strong magnetic attraction.

In a preferred embodiment: the expansion cavity I and the expansion cavity III are simultaneously charged, and the number of air inlets of the expansion cavity I is more than that of the air inlets of the expansion cavity III;

The piston is driven to move by the rotation of the threaded rod so as to change the volumes of the expansion cavity I and the expansion cavity III.

In a preferred embodiment: the outer perforated pipe and the inner perforated pipe are in interference fit.

In a preferred embodiment: the aperture ratio of the inner perforated pipe is far greater than that of the outer perforated pipe.

In a preferred embodiment: the outer wall of the valve core main body close to the small spring end and the inner wall of the cylinder body have a gap of more than 2mm

In a preferred embodiment: the assembly of the piston with the first large spring seat releases the rotational freedom of rotation about the axis, ensuring that only the piston rotates with rotation of the threaded rod.

In a preferred embodiment: the side wall of the second cylinder body is provided with back pressure regulating holes II at intervals along the circumferential direction, the back pressure regulating holes II are communicated with different cavities under the action of movement of the valve core, and when the internal pressure difference is smaller, the back pressure regulating holes II are in a normally closed state.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. Compared with the traditional integrated muffler with a fixed internal structure, the invention provides the pressure difference self-adaptive massage armchair muffler, and the position of the internal valve core of the muffler can be self-adaptively adjusted according to the pressure difference in the muffler. Therefore, on the premise of not introducing sound absorption materials, the flexible muffler internal structure is designed through the springs, the valve core is pushed to move by utilizing pressure difference, and the transmission loss is increased; on the other hand, the mutual compensation of the pressure of expansion cavities at the two ends of the muffler is realized, and the unsmooth exhaust of a certain side due to overlarge pressure drop is avoided; the back pressure of the muffler is related to the aperture of the perforated pipe, the length of a small hole channel and the like, and the perforated pipe is replaced and the reasonable installation position is determined by utilizing the magnetic attraction assembly advantage so as to meet different working conditions of the friction chair; the back pressure regulating hole I is communicated with the valve core to pre-release part of gas when the pressure of the expansion cavity II is overlarge, and the back pressure regulating hole I assists in exhausting when the pressure of the expansion cavity III is overlarge, so that the phenomenon of overlarge local back pressure cannot be caused in the whole process; the valve core structure in the exhaust process floats, the acoustic impedance is in a continuously changing state, the probability of resonance between gas and the structure is reduced, and multi-band noise elimination is realized.

Drawings

FIG. 1 is a partial semi-sectional schematic view of a multi-air pump exhaust-muffler system assembly for a massage chair.

Fig. 2 is a schematic diagram of a magnetic suction assembled differential pressure self-adaptive massage armchair muffler with replaceable perforated pipes in a quarter section.

FIG. 3 is a schematic diagram of an important muffler component, an alternative perforated pipe spool.

In the drawing, 1.1-first cylinder, 1.2-second cylinder, 1.3-stop screw, 1.4-strong magnet, 1.5-iron core, 1.6-second end cover, 1.7-connecting pipe, 1.8-first end cover, 2.1-first big spring seat, 2.2-big spring, 2.3-second big spring seat, 2.4-aligning block, 2.5-first small spring seat, 2.6-second small spring seat, 2.7-small spring, 3.1-outer perforated pipe base, 3.2-outer perforated pipe, 3.3-inner perforated pipe, 3.4-spool main body, 4.1-threaded rod, 4.2-piston, 5-expansion chamber I, 6-expansion chamber II, 7-side back pressure regulating hole, 8-side back pressure vent hole, 9-vent hole, 10-expansion chamber III, 11-air inlet, 12-inner chamber, 13-back pressure hole II, 14-expansion chamber I, 15-back pressure regulating hole I, 16-conical valve spool.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.

In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," configured to, "" engaged with, "" connected to, "and the like are to be construed broadly, and may be, for example," connected to, "wall-mounted," connected to, removably connected to, or integrally connected to, mechanically connected to, electrically connected to, directly connected to, or indirectly connected to, through an intermediary, and may be in communication with each other between two elements, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the terms herein.

As shown in figure 1, the exhaust-silencing system assembly of the multi-air pump of the certain massage chair is provided with four air pumps of the massage chair in series connection at the lowest end, a hose is connected to the air outlet of the air pump, the other end of the hose is connected with the silencer through a connecting pipe 1.7, and the length of the hose is not too long, otherwise, the exhaust is not facilitated. The four air pumps exhaust simultaneously, the exhaust amount of the single air pump is the same within the same time, and the whole exhaust process is controlled within 8S.

Referring to fig. 1-3, a differential pressure adaptive massage armchair muffler comprising: the main body, the reset spring group, the replaceable perforated pipe valve core and the adjusting mechanism; the main body is formed by splicing a first cylinder body 1.1 and a second cylinder body 1.2, a first end cover 1.8 and a second end cover 1.6 are installed on two sides of the main body in the axial direction through threaded connection, and the second end cover 1.6 is a fixed side and is horizontally fixed on a massage chair body through screws;

The first cylinder body 1.1 and the second cylinder body 1.2 are spliced inside to form a muffler cavity; a piston 4.2 is arranged at one end, close to the first end cover 1.8, of the muffler cavity, a first large spring seat 2.1 is embedded on the piston 4.2, and the first large spring seat 2.1 has a rotational degree of freedom relative to the piston 4.2; one end of the large spring 2.2 is arranged on the first large spring seat 2.1, and the other end extends towards the second end cover 1.6 and is arranged on the second large spring seat 2.3; the second large spring seat 2.3 is fixed on the outer perforated pipe base 3.1;

The side, facing the first end cover 1.8, of the second end cover 1.6 is provided with a second small spring seat 2.6, the side, facing the first end cover 1.8, of the valve core main body 3.4 is also provided with a centering block 2.4, the centering block 2.4 is connected with the first small spring seat 2.5, and a small spring is arranged between the first small spring seat 2.5 and the second small spring seat 2.6;

A perforated pipe is arranged between the outer perforated pipe base 3.1 and the valve core main body 3.4; the perforated pipe is double-layered, the outer perforated pipe 3.2 is embedded in the base 3.1 of the outer perforated pipe 3.2 in a clamping groove mode, and the inner perforated pipe 3.3 and the valve core main body 3.4 are integrated;

an expansion cavity I5 is formed between the piston 4.2 and the base 3.1 of the outer perforated pipe 3.2, an expansion cavity II6 is formed between the base 3.1 of the outer perforated pipe 3.2 and the valve core main body 3.4, and an expansion cavity III10 is formed between the valve core main body 3.4 and the second end cover 1.6; the side of the piston 4.2 facing the first end cap 1.8 is connected to a threaded rod 4.1, and the threaded rod 4.1 rotates to control the position of the piston 4.2 so as to change the volume of each expansion cavity;

The side wall of the second cylinder body 1.2 is provided with backpressure regulating holes I15 at intervals along the circumferential direction, the backpressure regulating holes I15 are communicated with the valve core to perform partial gas pre-release when the pressure of the expansion cavity II6 is overlarge, and the backpressure regulating holes I15 assist in exhausting when the pressure of the expansion cavity III10 is overlarge.

The iron core 1.5 is arranged in the circumferential direction of the annular boss of the first cylinder body 1.1, the powerful magnet 1.4 is arranged in the circumferential direction of the annular boss of the second cylinder body 1.2, and the first cylinder body 1.1 and the second cylinder body 1.2 are assembled through powerful magnetic attraction.

The expansion cavity I5 and the expansion cavity III10 are simultaneously charged, and the number of the air inlets 14 of the expansion cavity I5 is more than that of the air inlets 11 of the expansion cavity III 10; the piston 4.2 is moved by rotation of the threaded rod 4.1 to change the volume of the expansion chamber I5 and the expansion chamber III 10.

The outer perforated pipe 3.2 and the inner perforated pipe 3.3 are in interference fit, and the aperture ratio of the inner perforated pipe 3.3 is far greater than that of the outer perforated pipe 3.2. The outer wall of the valve core main body 3.4 close to the small spring end and the inner wall of the cylinder body have a gap of more than 2mm, and the assembly of the piston 4.2 and the first large spring seat 2.1 releases the rotation freedom degree of rotation around the axis, so that only the piston 4.2 rotates along with the rotation of the threaded rod 4.1.

The side wall of the second cylinder body 1.2 is provided with back pressure regulating holes II13 along the circumferential direction at intervals, the back pressure regulating holes II13 are communicated with different cavities under the action of valve core movement, and when the internal pressure difference is smaller, the back pressure regulating holes II13 are in a normally closed state.

The total exhaust amount of the three air pumps on the side of the threaded rod 4.1 is larger than that of a single air pump on the fixed side. In the early stages of venting, the gas quickly fills the expansion chamber I5, assuming that the expansion chamber I5 first reaches a maximum pressure, the chamber gas pressure is greater than the sum of the spring force and the expansion chamber III10 pressure. Simultaneously, gas enters the expansion cavity II6 formed by the cylinder body, the valve core main body 3.4 and the outer perforated pipe base 3.1 in a surrounding mode through the replaceable perforated pipe, the gas flows to the central axis pipeline of the valve core from the cavity, the flowing through area is suddenly changed, and the flow speed is increased by extrusion. The pressure difference and the air flow extrusion can cause larger exhaust back pressure, the valve core moves towards the fixed side direction, the back pressure adjusting hole I15 and the back pressure adjusting hole II15 are communicated to a certain extent, the conducting area is in direct proportion to the sum of the pressure difference and the extrusion force, the back pressure in the initial stage of exhaust can be effectively reduced, the gas smoothness is ensured, the gas energy is consumed when the valve core is pushed to move, and the valve core is reset by the spring force along with the reduction of the pressure difference. The energy is further lost in the process of gas flowing through the valve core inner cavity 12, part of gas is split into the cavity where the exhaust hole 9 is located through the valve core conical surface hole 16, part of gas and gas in the expansion cavity III10 flow into the cavity where the exhaust hole 9 is located after converging, the pressure of the expansion cavity III10 rises suddenly when converging, at the moment, the gas pressure of the cavity is larger than the sum of the acting force of the large spring and the small spring and the pressure of the expansion cavity I5, the valve core moves towards the side direction of the threaded rod 4.1, the back pressure adjusting hole I15 moves to a certain degree to exhaust together with the exhaust hole 9, and the exhaust efficiency is improved. The exhaust process is ended by the spring return force and the structures return to the original positions. In the whole exhaust process, when the pressure of a certain cavity is excessively reduced, other cavities perform self-adaptive pressure compensation on the cavity, and the exhaust process is smooth.

To the air pump of different powers, change each chamber volume size through adjusting threaded rod 4.1, change outer perforated tube 3.2 simultaneously, adjustable inside and outside perforated tube 3.2's axial and circumferential position before the assembly, the assembly position combination satisfies multiple exhaust demand with abundant exhaust scheme. The stop screw 1.3 can prevent the silencer from being broken down, the valve core can shake violently in the cylinder body, and the hole for installing the stop screw 1.3 and other holes can be used for judging the valve core installation position during installation. The back pressure regulating hole 7 and the side back exhaust hole 8 on the cylinder body side are reserved holes so as to compare the exhaust effects of the exhaust holes at different positions.

The foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present invention within the scope of the present invention disclosed herein by this concept, which falls within the actions of invading the protection scope of the present invention.

Claims

1. A differential pressure adaptive massage chair muffler, comprising: a main body; the main body is formed by splicing a first cylinder body and a second cylinder body, the first end cover and the second end cover are installed on two sides of the main body in the axial direction through threaded connection, the second end cover is a fixed side, and the second end cover is horizontally fixed on the massage chair body through screws;

the side wall of the second cylinder body is provided with back pressure regulating holes I at intervals along the circumferential direction, the back pressure regulating holes I are communicated with the valve core to pre-release part of gas when the pressure of the expansion cavity II is overlarge, and the back pressure regulating holes I assist in exhausting when the pressure of the expansion cavity III is overlarge;

The annular boss of the first cylinder is internally provided with an iron core in the circumferential direction, the annular boss of the second cylinder is internally provided with a powerful magnet in the circumferential direction, and the first cylinder and the second cylinder are assembled through powerful magnetic attraction; the expansion cavity I and the expansion cavity III are simultaneously charged, and the number of air inlets of the expansion cavity I is more than that of the air inlets of the expansion cavity III;

The piston is driven to move through the rotation of the threaded rod so as to change the volumes of the expansion cavity I and the expansion cavity III; the outer perforated pipe and the inner perforated pipe are in interference fit; the aperture ratio of the inner perforated pipe is far greater than that of the outer perforated pipe; the outer wall of the valve core main body, which is close to the small spring end, and the inner wall of the cylinder body are provided with a gap of more than 2 mm; the assembly of the piston and the first large spring seat releases the rotation freedom degree of rotation around the axis, so that only the piston rotates along with the rotation of the threaded rod; the side wall of the second cylinder body is provided with back pressure regulating holes II along the circumferential direction at intervals, the back pressure regulating holes II are communicated with different cavities under the action of movement of the valve core, and when the internal pressure difference is smaller, the back pressure regulating holes II are in a normally closed state.