CN113284478A

CN113284478A - Differential pressure self-adaptive massage chair silencer

Info

Publication number: CN113284478A
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: 2021-08-20

Abstract

The invention belongs to the technical field of massage armchair noise elimination, and particularly discloses a pressure difference self-adaptive massage armchair noise eliminator which can make self-adaptive adjustment aiming at the exhaust process of a massage armchair in a short time when the massage armchair is dynamically transited to a stable state, and realizes pressure balance control and floating change of the size of each expansion cavity of a cylinder body through the reset force of a spring and the pressure difference of two sides of a perforated pipe assembly. Meanwhile, an assembled structure and an adjusting structure are adopted, so that replacement of the perforated pipe and pre-adjustment of the volume of the cavity are respectively realized. The silencer has a flexible structure, the position of the inner valve core is adjusted according to the working mode of the massage chair, the pressure in the whole exhaust process is self-adaptively adjusted, 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 silencer

Technical Field

The invention relates to a massage armchair, in particular to a silencer of the massage armchair.

Background

In recent years, the demand of people for electric massage chairs has been increasing, and the working performance and the use comfort of the massage chair have been the key points of attention. In order to improve the massage experience, more air bags need to be arranged to press various body parts such as the waist, the back, the arms, the legs and the hips, and meanwhile, the design of the larger air bags is required to meet the requirement of different body types of groups on the pressing force. The increase of gasbag number and gasbag size can improve electronic air pump air admission and exhaust volume, and in the same time, the increase of exhaust volume can bring the problem that the exhaust noise risees to influence massage experience. At present, the content of control research on exhaust noise of common massage chairs in the market is less, rapid and sufficient exhaust is often realized by simple modes such as changing the geometric dimension of an exhaust pipe or the shape of an exhaust nozzle, and the exhaust noise suppression effect is not good. The silencing of the silencing tube is one of silencing methods which are widely applied at present, and the silencing tube can effectively weaken pipeline transmission noise while ensuring gas circulation. The types of mufflers are mainly classified into three types: resistive mufflers, reactive mufflers and compound mufflers, the latter two most common.

The reactive muffler generally comprises a cylinder, a perforated pipe, a partition plate and the like, and changes acoustic impedance by utilizing the sudden change of the sectional area of a pipeline, so that sound waves are reflected and interfered 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 energy dissipation can generate unfavorable back flow and vortex at the interaction place of the gas and the wall surface, which leads to the increase of the static pressure of the internal cavity, generates larger pressure loss and reduces the exhaust efficiency.

Theoretically, the noise passing frequency can be changed by arranging a plurality of expansion chambers on the silencer, so that the silencing quantity is improved. When the gas flow velocity is larger, the regeneration noise is easier to generate, and the internal membrane of the silencer generates resonance under the action of gas flow excitation. Therefore, the reasonable silencing cavity is arranged in the limited space, and the resonance frequency of the internal diaphragm is kept away from the air frequency, so that the noise can be reduced to a certain extent.

The silencer structural design is mainly designed in an integrated mode, the noise elimination under the specific noise background can only be met under a single design scheme, and once a certain component inside the silencer is damaged, the silencer is not easy to disassemble, assemble and maintain. The long-term use can cause dirt accumulation and inconvenient cleaning. In summary, the overall maintenance cost of the muffler is high.

Adopt single silencer to carry out many air pumps and exhaust simultaneously, gaseous mutual interference easily, exhaust efficiency is low. If a plurality of silencers are arranged, the occupied space is large and the installation is inconvenient.

Disclosure of Invention

The invention aims to provide a silencer of a pressure difference self-adaptive massage armchair. The silencer is suitable for a scene that multiple air pumps exhaust simultaneously 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 silencing multiple frequency band noises.

In order to meet the technical requirements, the invention adopts 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 and a second cylinder, a first end cover and a second end cover are connected and installed on two sides of the main body in the axial direction through threads, and the second end cover is a fixed side and is horizontally fixed on the massage armchair body through screws;

the first cylinder and the second cylinder are spliced to form a silencer 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 in the piston, and the first large spring seat has rotational freedom relative to the piston; one end of the large spring is arranged on the first large spring seat, and the other end of the large spring extends towards the second end cover and is arranged on the second large spring seat; the second large spring seat is fixed on the outer perforated pipe base;

a second small spring seat is arranged on one side, facing the first end cover, of the second end cover, an aligning block is further arranged on one side, facing the first end cover, of the valve core main body, the aligning 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 perforated pipe is double-layer, the outer perforated pipe is embedded in the base of the outer perforated pipe 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, which faces 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 backpressure adjusting holes I at intervals along the circumferential direction, the backpressure adjusting holes I are communicated with the valve core to pre-release part of gas when the pressure of the expansion cavity II is too high, and the backpressure adjusting holes I assist in exhausting when the pressure of the expansion cavity III is too high.

In a preferred embodiment: the iron core is arranged in the circumferential direction of the annular boss of the first barrel, the strong magnet is arranged in the circumferential direction of the annular boss of the second barrel, and the first barrel and the second barrel are assembled through strong magnetic attraction.

In a preferred embodiment: the expansion cavity I and the expansion cavity III simultaneously feed air, and the number of the 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 volume 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 inner perforated tube has a much greater open porosity than the outer perforated tube.

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 clearance of more than 2mm

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

In a preferred embodiment: the side wall of the second cylinder body is provided with backpressure adjusting holes II at intervals along the circumferential direction, the backpressure adjusting holes II are communicated with different cavities under the action of movement of the valve core, and when the internal pressure difference is small, the backpressure adjusting 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 silencer with a fixed internal structure, the pressure difference self-adaptive massage armchair silencer provided by the invention has the advantages that the position of the inner valve core of the integrated silencer can be self-adaptively adjusted according to the pressure difference in the silencer. Therefore, on the premise of not introducing sound absorption materials, the flexible silencer internal structure is designed through the spring, the valve core is pushed to move by utilizing the pressure difference, and the transmission loss is increased; on the other hand, the mutual compensation of the pressure of the expansion cavities at the two ends of the silencer is realized, and unsmooth exhaust caused by overlarge pressure drop at one side is avoided; the back pressure of the silencer is related to the aperture of the perforated pipe, the length of the small hole channel and the like, 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 massage chair; the backpressure 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 backpressure regulating hole I assists in exhausting gas when the pressure of the expansion cavity III is overlarge, so that the phenomenon of overlarge local backpressure cannot be caused in the whole process; in the exhaust process, the valve core structure floats, the acoustic impedance is in a constantly changing state, the probability of resonance generated between gas and the structure is reduced, and multi-band noise elimination is realized.

Drawings

Fig. 1 is a partial half-section schematic view of a multi-air-pump exhaust-silencing system assembly of a massage chair.

Fig. 2 is a quarter sectional view of a muffler of a magnetic suction assembly type differential pressure adaptive massage chair with replaceable perforated pipes.

FIG. 3 is a schematic diagram of an important part of the muffler, namely a replaceable perforated pipe valve core.

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

Detailed Description

The technical solution 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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like, are used in a broad sense, and for example, "connected" may be a wall-mounted connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention specifically.

As shown in figure 1, the multi-air-pump exhaust-noise elimination system assembly of a certain massage chair is characterized in that four massage chair air pumps connected in series are arranged at the lowest end of the assembly, a hose is connected to an air outlet of each air pump, the other end of the hose is connected with a noise eliminator through a connecting pipe 1.7, the length of the hose is not too long, and the hose is not beneficial to exhaust. The four air pumps exhaust air simultaneously, the air displacement of a single air pump is the same in the same time, and the whole air exhaust process is controlled within 8S.

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

the first cylinder 1.1 and the second cylinder 1.2 are spliced to form a silencer cavity; a piston 4.2 is arranged at one end, close to a first end cover 1.8, of the muffler cavity, a first large spring seat 2.1 is embedded in the piston 4.2, and the first large spring seat 2.1 has rotational freedom relative to the piston 4.2; one end of the large spring 2.2 is mounted on the first large spring seat 2.1, and the other end extends towards the second end cap 1.6 and is mounted 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;

a second small spring seat 2.6 is arranged on one side, facing the first end cover 1.8, of the second end cover 1.6, a centering block 2.4 is further arranged on one side, facing the first end cover 1.8, of the valve core main body 3.4, the centering block 2.4 is connected with a 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-layer, 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 cover 1.8 is connected with 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 1.2 is provided with back pressure adjusting holes I15 at intervals along the circumferential direction, the back pressure adjusting holes I15 are communicated with the valve core to pre-release part of gas when the pressure of the expansion cavity II6 is overlarge, and the back pressure adjusting holes I15 assist in exhausting gas 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 barrel 1.1, the strong magnet 1.4 is arranged in the circumferential direction of the annular boss of the second barrel 1.2, and the first barrel 1.1 and the second barrel 1.2 are assembled through strong magnetic attraction.

The expansion chamber I5 and the expansion chamber III10 are simultaneously charged, and the number of the gas inlets 14 of the expansion chamber I5 is more than that of the gas inlets 11 of the expansion chamber III 10; the piston 4.2 is moved by rotation of the threaded rod 4.1 to vary 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 are provided with a clearance of more than 2mm, the assembly of the piston 4.2 and the first large spring seat 2.1 releases the rotational freedom degree of rotating around the axis, and 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 adjusting holes II13 at intervals along the circumferential direction, the back pressure adjusting holes II13 are communicated with different cavities under the action of movement of the valve core, and when the internal pressure difference is small, the back pressure adjusting holes II13 are in a normally closed state.

The total displacement of the three air pumps at the side of the threaded rod 4.1 is larger than the displacement of a single air pump at the fixed side. During the initial period of venting, gas quickly fills expansion chamber I5, assuming that expansion chamber I5 reaches its maximum pressure first, which is greater than the sum of the spring force and expansion chamber III10 pressure. Meanwhile, gas enters an expansion cavity II6 enclosed by the cylinder, the valve core main body 3.4 and the outer perforated pipe base 3.1 through the replaceable perforated pipe, and flows to a pipeline of the central axis of the valve core from the cavity, the circulation area changes suddenly, and the flow rate is increased due to extrusion. Pressure difference and air current extrusion can cause great exhaust backpressure, and the case moves to fixed side direction this moment, moves certain degree backpressure regulation hole I15 and switches on with backpressure regulation hole II15, and the area of switching on is directly proportional with pressure difference and extrusion force sum, can effectively reduce exhaust initial stage backpressure, guarantees gaseous smooth, and gaseous energy can consume when promoting the movement of case, and along with the pressure difference reduces, the spring force resets the case. Energy is further lost in the process that gas flows through the valve core inner cavity 12, part of gas is shunted to the cavity where the vent hole 9 is located through the valve core conical surface hole 16, part of gas and gas in the expansion cavity III10 flow to the cavity where the vent 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 a large 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 and exhausts together with the vent hole 9, and the exhaust efficiency. The exhaust process is ended by the spring return force and the structures return to the initial position. In the whole exhaust process, when the pressure drop of a certain cavity is overlarge, other cavities perform self-adaptive pressure compensation on the certain cavity, and the exhaust process is smooth.

Aiming at air pumps with different powers, the volume of each cavity is changed by adjusting the threaded rod 4.1, the outer perforated pipe 3.2 is replaced at the same time, the axial and circumferential positions of the inner and outer perforated pipes 3.2 can be adjusted before assembly, and the assembly position combination meets various exhaust requirements by enriching the exhaust scheme. The stop screw 1.3 can prevent the silencer trouble, and the case acutely rocks in the barrel, judges case mounted position when the hole of installation stop screw 1.3 and other holes all can be used to the installation. The barrel side backpressure adjusting hole 7 and the side backpressure exhaust hole 8 are reserved holes to compare the exhaust effect of exhaust holes at different positions.

The above description 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 can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.

Claims

1. The utility model provides a pressure differential self-adaptation massage armchair silencer which characterized in that includes: a main body; the main body is formed by splicing a first cylinder and a second cylinder, a first end cover and a second end cover are connected and installed on two sides of the main body in the axial direction through threads, and the second end cover is a fixed side and is horizontally fixed on the massage armchair body through screws;

2. The muffler of claim 1, wherein: the iron core is arranged in the circumferential direction of the annular boss of the first barrel, the strong magnet is arranged in the circumferential direction of the annular boss of the second barrel, and the first barrel and the second barrel are assembled through strong magnetic attraction.

3. The muffler of claim 1, wherein: the expansion cavity I and the expansion cavity III simultaneously feed air, and the number of the air inlets of the expansion cavity I is more than that of the air inlets of the expansion cavity III;

4. The muffler of claim 1, wherein: the outer perforated pipe and the inner perforated pipe are in interference fit.

5. The muffler of claim 1, wherein: the inner perforated tube has a much greater open porosity than the outer perforated tube.

6. The muffler of claim 1, wherein: 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 clearance of more than 2 mm.

7. The muffler of claim 1, wherein: the assembly of the piston with the first large spring seat releases rotational freedom of rotation about the axis, ensuring that only the piston rotates with the rotation of the threaded rod.

8. The muffler of claim 1, wherein: the side wall of the second cylinder body is provided with backpressure adjusting holes II at intervals along the circumferential direction, the backpressure adjusting holes II are communicated with different cavities under the action of movement of the valve core, and when the internal pressure difference is small, the backpressure adjusting holes II are in a normally-closed state.