CN208564692U

CN208564692U - Chain saw muffler

Info

Publication number: CN208564692U
Application number: CN201821218562.3U
Authority: CN
Inventors: 王洪刚; 何艳卿
Original assignee: Hangzhou Weiye Garden Machinery Co Ltd
Current assignee: Hangzhou Weiye Garden Machinery Co Ltd
Priority date: 2018-07-31
Filing date: 2018-07-31
Publication date: 2019-03-01
Anticipated expiration: 2028-07-31

Abstract

The utility model discloses chain saw mufflers, including back casing and procapsid, the procapsid is fixedly mounted on the side of back casing, siphunculus is symmetrically installed between the procapsid and back casing, the back casing, the side of the air intake are fixedly installed with resistive shell, and the side of the resistive shell is fixedly installed with resonant cavity, the resonant cavity and resistive shell are respectively positioned on the inner cavity of back casing, and between siphunculus.The utility model is improved on traditional chain saw muffler, on the basis of its single noise reduction means, increase several components, form an impedance composite noise reduction, erasure effect is improved, and incorporates internal gas flow, keeps air pressure in muffler more stable, so as to avoid the generation of secondary noise, there is very high practical value.

Description

Chain saw muffler

Technical field

The utility model relates to chain saw components, in particular to chain saw muffler.

Background technique

Chain saw, the abbreviation of " gasoline chain saw " or " petrol power saw ".To the power saw lumbered with producing material.Its saw cutting mechanism For saw chain.Power section is petrol engine, its exhaust emissions end is provided with muffler assembly, at noise reduction and tail gas Reason.

Existing chain saw muffler haves the defects that certain in use, is in particular in that noise reduction is not thorough, noise reduction means Single, discharge outlet air-flow is unstable to be easy to cause secondary noise, so needing to make improvements.

Utility model content

The purpose of the utility model is to provide chain saw mufflers.The utility model carries out on traditional chain saw muffler It improves, on the basis of its single noise reduction means, increases several components, form an impedance composite noise reduction, improve Erasure effect, and incorporate internal gas flow, keeps air pressure in muffler more stable, so as to avoid the generation of secondary noise, With very high practical value.

The technical solution of the utility model includes: chain saw muffler, including back casing and procapsid, the procapsid are fixedly mounted It is symmetrically installed with siphunculus between the side of back casing, the procapsid and back casing, the back casing, the one of the air intake Side is fixedly installed with resistive shell, and the side of the resistive shell is fixedly installed with resonant cavity, the resonant cavity and resistive shell It is respectively positioned on the inner cavity of back casing, and between siphunculus.

In above-mentioned chain saw muffler, expansion chambers are provided between the procapsid and back casing.

In chain saw muffler above-mentioned, the resistive shell is cross arrangement, is provided with through slot on the resistive shell, There are five the through slot settings, and heatproof silencing cotton is provided on the inner wall of the through slot.

In chain saw muffler above-mentioned, siphunculus supporting plate is fixedly installed in the middle part of the procapsid, the siphunculus supporting plate Top offers exhaust pipe, and the inner edge of the exhaust pipe is provided with the network of fire that disappears.

Compared with prior art, to be solved in the utility model is that existing chain saw muffler noise reduction means are single, is disappeared The problem of audio fruit is poor and there may be secondary noises, traditional muffler carries out noise reduction generally by the way of resonant cavity, Resonant cavity muffler has frequency selectivity strong, the big advantage of low frequency sound deadening capacity, and the utility model is arranged in the front end of resonant cavity There is resistive shell, which is provided with damping structure, and which includes heatproof silencing cottons, can reduce sound frequency, gas The sound-damping qualities of resonant cavity can be improved by entering in resonant cavity after the buffer function of the resistive shell in stream, while The rear end of resonant cavity is provided with expansion cavity, can further decrease to air drag, while the resistance of its acoustic reactance can be made to mutate, sound Phenomena such as direction of propagation of wave changes, and reflection, interference occur for portion in the cavity, to achieve the effect that noise elimination.

The utility model has many advantages, such as portable construction, small in size and low cost, while its internal component is being installed Can mutually it splice, and structure distribution is also very intuitive, manufacture easy to produce has very high practical value and promotion prospect.

Detailed description of the invention

Fig. 1 is the utility model overall structure diagram；

Fig. 2 is the utility model procapsid structural schematic diagram；

Fig. 3 is the resistive schematic diagram of housing structure of the utility model.

In figure: 1- procapsid；2- resonant cavity；3- back casing；4- siphunculus；5- siphunculus supporting plate；6- exhaust pipe；7- expansion chambers； The resistive shell of 8-；9- through slot；10- air intake.

Specific embodiment

The utility model is further described with reference to the accompanying drawings and examples, but is not intended as to the utility model The foundation of limitation.

Embodiment: chain saw muffler, as illustrated in the accompanying drawings from 1 to 3, chain saw muffler, including back casing 3 and procapsid 1, it is described Procapsid 1 is fixedly mounted on the side of back casing 3, siphunculus 4 is symmetrically installed between the procapsid 1 and back casing 3, after described The middle part of shell 3 is provided with air intake 10, and the side of the air intake 10 is fixedly installed with resistive shell 8, the resistive shell 8 Side be fixedly installed with resonant cavity 2, the resonant cavity 2 and resistive shell 8 are respectively positioned on the inner cavity of back casing 3, and are located at siphunculus 4 Between, procapsid 1 and back casing 3 have collectively constituted the external structure of the muffler, while the junction of front and rear housings needs Mounting gasket structure increases the resiliency between two structures, also improves its air-tightness.

It is further preferred that being provided with expansion chambers 7 between the procapsid 1 and back casing 3, the setting of expansion chambers 7 makes it Inner passage is expanded suddenly, changes the direction of propagation of sound wave by force.

It is further preferred that the resistive shell 8 is cross arrangement, through slot 9, institute are provided on the resistive shell 8 It states there are five the settings of through slot 9, is provided with heatproof silencing cotton on the inner wall of the through slot 9, which can be very straight by attached drawing 3 It obtains with seeing, the design of the structure increases the contact area of the shell and cavity, keeps the heat dissipation performance of the part more preferable, favorably In prolonging its service life.

It is further preferred that the middle part of the procapsid 1 is fixedly installed with siphunculus supporting plate 5, the top of the siphunculus supporting plate 5 Exhaust pipe 6 is offered, the inner edge of the exhaust pipe 6 is provided with the network of fire that disappears, and exhaust pipe 6 is for being vented, and the network of fire that disappears is for inhibiting fire Star.

During practice, as shown in Figure 1.The exhaust gas of gasoline engine enters muffler shell from air intake 10 In inner cavity, what is initially entered is shunted under the action of resistive shell 8 in resistive shell 8, due to resistance in resistive shell 8 The setting of warm silencing cotton carries out resistive noise reduction in the cavity of resistive shell 8, and air-flow is by entering resonance after resistive shell 8 In chamber 2, using resonance acoustical absorption principle, under the action of sound wave, air column generates vibration, air column and accent wall friction when vibration, A part of sound can be converted to thermal energy and dissipate, and air-flow enters in expansion chambers later, sound wave carried out in expansion chambers reflection and Interference, further to be eliminated the noise, by the setting of the three-level noise-reducing structure, which obtains very big mention on performance muffler It rises.

Claims

1. chain saw muffler, it is characterised in that: including back casing (3) and procapsid (1), the procapsid (1) is fixedly mounted on The side of back casing (3) is symmetrically installed with siphunculus (4) between the procapsid (1) and back casing (3), the back casing (3) Middle part is provided with air intake (10), and the side of the air intake (10) is fixedly installed with resistive shell (8), the resistive shell (8) side is fixedly installed with resonant cavity (2), and the resonant cavity (2) and resistive shell (8) are respectively positioned on the inner cavity of back casing (3), And between siphunculus (4).

2. chain saw muffler according to claim 1, it is characterised in that: set between the procapsid (1) and back casing (3) It is equipped with expansion chambers (7).

3. chain saw muffler according to claim 1, it is characterised in that: the resistive shell (8) is cross arrangement, institute It states and is provided on resistive shell (8) through slot (9), there are five through slot (9) settings, is provided on the inner wall of the through slot (9) Heatproof silencing cotton.

4. chain saw muffler according to claim 1, it is characterised in that: be fixedly installed in the middle part of the procapsid (1) Siphunculus supporting plate (5) offers exhaust pipe (6) above the siphunculus supporting plate (5), and the inner edge of the exhaust pipe (6), which is provided with, to disappear The network of fire.