CN2934588Y

CN2934588Y - Exhaust tube section area variable exhausting and silencing apparatus for internal combustion engine

Info

Publication number: CN2934588Y
Application number: CN 200620032171
Authority: CN
Inventors: 林辉江
Original assignee: TIANRUI ENVIRONMENT PROTECTION NEW MATERIAL CO Ltd HENAN
Current assignee: TIANRUI ENVIRONMENT PROTECTION NEW MATERIAL CO Ltd HENAN
Priority date: 2006-06-02
Filing date: 2006-06-02
Publication date: 2007-08-15
Anticipated expiration: 2016-06-02

Abstract

An internal combustion engine exhaust muffler with variable cross-sectional area of exhaust pipe includes an intake noise elimination tube and an exhaust noise elimination tube arranged in the inner cavity. The inner cavity of the shell is divided into four cavities by clapboards, which are set up in sequence from anterior to posterior, the clapboard 3, 7 both have stomata communicating with the anterior cavity and the posterior cavity and the closed-end of the intake noise elimination tube gets through the anterior end cover 1and clapboard 3, enters the chamber II, I and is combined with the clapboard 6 in sequence; The exhaust noise elimination tube consists of two exhaust noise elimination tubes with different diameter and length, the closed end of which respectively gets through the posterior end cover 8, enters the cavity 8 and is combined with the clapboard 7, and the open ending of the exhaust noise elimination tube 9 with bigger diameter and shorter length is arranged with an exhaust control valve 10; An intermediate noise elimination tube is arranged in the cavity II, I, III, the open ending of which is arranged in the cavity II and the closed ending of which is arranged in the cavity III. The muffler can always maintain the air speed of exhaust pipe at the best value in a particular, the muffler insertion loss (muffler volume) always at the maximum and the power loss ratio always at the minimum.

Description

The exhaust silencer for internal-combustion engine that the outlet pipe sectional area is variable

Technical field

The utility model relates to a kind of silencing apparatus, the particularly a kind of variable exhaust silencer for internal-combustion engine of outlet pipe sectional area that can control the outlet pipe sectional area automatically.

Background technique

The exhaust silencer for internal-combustion engine of prior art mostly is single tube type structure (outlet pipe is housed), and minority is two-pipe structure (two outlet pipes is housed).No matter be to adorn one or two outlet pipes, their cross-section area all immobilizes.That is to say that the outlet pipe of prior art can not change the circulation area of its outlet pipe with the variation of extraction flow.Specifically, for the exhaust silencer for internal-combustion engine that adopts more elongated pipe as outlet pipe, though can satisfy the requirement under moderate duty, the medium rotating speed, noise reduces, but when internal-combustion engine enters big load, the operation of high rotating speed, because extraction flow increases, exhaust velocity increases, resistance increases, and the regenerated noise that air-flow produces also obviously increases, and makes noise, power loss increase thereupon.Otherwise for adopting more short and thick pipe as the outlet pipe exhaust silencer for internal-combustion engine, though can satisfy load greatly, high rotating speed, requirement that noise is low, when moving at moderate duty, below the medium rotating speed, its noise strengthens on the contrary.

Summary of the invention

The purpose of this utility model provides a kind of variable exhaust silencer for internal-combustion engine of outlet pipe sectional area that can control the outlet pipe sectional area automatically at existing deficiency in the above-mentioned prior art just.

The purpose of this utility model can realize by following technique measures:

The variable exhaust silencer for internal-combustion engine of outlet pipe sectional area of the present utility model comprises the housing of being made up of forward and backward end cap and hollow cylinder, and be arranged on the exhausting silencer pipe that is processed with a plurality of pores on the intake noise reduction pipe that is processed with a plurality of pores on the root canal wall in the housing inner chamber and at least one root canal wall, described housing inner chamber is separated into four chambers by setting gradually three dividing plates from front to back, be II, I, four chambers of III, IV, and be arranged in all offer on forward and backward two dividing plates of housing inner chamber be communicated with before and after the pore in chamber; The closed end of described intake noise reduction pipe passes the through hole that processes on front cover, the preceding dividing plate successively and enters in chamber II and the I, terminates in intermediate clapboard, and combines with intermediate clapboard; Described exhausting silencer pipe is made up of diameter, two exhausting silencer pipes that length is different, the closed end of two exhausting silencer pipes passes the through hole that processes on the rear end cover respectively and enters chamber IV, terminate in rear bulkhead, and combine with rear bulkhead, in two exhausting silencer pipes big, the length of diameter the opening end of a short short and thick exhausting silencer pipe be provided with gas exhausting valve; In chamber II, I, III, be provided with the middle hush tube that is processed with a plurality of pores at least one root canal wall in the mode that is parallel to the intake noise reduction tube's axis, the opening end of this centre hush tube is positioned at chamber II, and its closed end is positioned at chamber III, and combines with rear bulkhead.

The utility model is provided with the middle hush tube that is processed with a plurality of pores on two root canal walls in the mode that is parallel to the intake noise reduction tube's axis in chamber II, I, III, hush tube cross sectional area sum is greater than the cross sectional area of intake noise reduction pipe in the middle of two; Described pore is all processed and is being arranged on the tube wall section of chamber III, and the area sum of a plurality of pores is greater than middle hush tube cross sectional area.

Gas exhausting valve described in the utility model is a Hand-operated butterfly valve.Certain described gas exhausting valve also can adopt the valve of other any known technology to realize, such as one-way valve etc.

The area sum of a plurality of pores that process on the described exhausting silencer tube wall is greater than exhausting silencer pipe cross sectional area; The elongated exhausting silencer pipe cross sectional area that diameter is less in two exhausting silencer pipes, length is long is less than intake noise reduction pipe cross sectional area; And the short and thick exhausting silencer pipe cross sectional area that diameter is big, length is short is greater than intake noise reduction pipe cross sectional area.

Described intake noise reduction pipe is arranged in pore quantity on the tube wall section of chamber I more than the stomatal number that is arranged on the chamber II tube wall section, and on two sections tube wall sections the area sum of pore greater than intake noise reduction pipe cross sectional area.

Described chamber I＞chamber IV＞chamber III＞chamber II; The area sum of pore is greater than intake noise reduction pipe cross sectional area on the dividing plate before described, and the area sum of pore is equally also greater than intake noise reduction pipe cross sectional area on the rear bulkhead.

Working principle of the present utility model and advantage are as follows:

When internal-combustion engine at moderate duty, when working under the medium speed conditions, high temperature from the internal-combustion engine discharge, the high speed pulse pneumatic enters after the silencing apparatus intake noise reduction pipe of the present utility model, go up pore (aperture) ejection from this pipe, the gas major part is sprayed among the chamber I to expand, buffering, fraction is sprayed among the chamber II to expand, buffering, gas flow direction changes 90 °, gas among the chamber I enters among the chamber II (also can be in pore plug-in mounting breathing pipe by the vent on the preceding dividing plate, gas is entered among the chamber II) via breathing pipe, and with chamber II in gas enter after compiling in the middle of hush tube, and be positioned at pore ejection on the chamber III tube wall section from it, in chamber III, expand, buffering, gas among the chamber III is by (also can be in the pore plug-in mounting breathing pipe of the pore on the rear bulkhead, make gas enter chamber IV via breathing pipe) enter among the chamber IV and expand, buffering, gas among the chamber IV enters the exhausting silencer pipe by passing through on the elongated exhausting silencer pipe, enters in the atmosphere after compiling.

When motor is in big load, the operation of high rotating speed, the driver opens Hand-operated butterfly valve 10 on the short and thick exhausting silencer pipe 9 by the steel wire pull-button, the major part of gas just can be discharged by short and thick exhausting silencer pipe among the chamber IV, fraction is discharged by elongated exhausting silencer pipe, realize two-tubely working simultaneously, the discharge airspeed is controlled in the optimum range, and exhaust sound is minimum.When airspeed dropped to a certain value, the driver closed Hand-operated butterfly valve by the steel wire pull-button, and short and thick exhausting silencer pipe quits work.Like this, when just having satisfied low-load, the slow-speed of revolution, it uses elongated exhausting silencer pipe, the requirement that noise reduces.Also satisfy high rotating speed, the exhausts simultaneously of big two pipes of load use, reduce noise, reduce the requirement of resistance.

The utility model one is the in good time unlatching by gas exhausting valve, and the airspeed in the exhausting silencer pipe is remained in the preferred range, reaches to reduce exhaust sound, reduce exhaust resistance, reduce the purpose of power loss and oil consumption.

The 2nd, go up " throttling " effect of aperture and the gas storage storage pressure effect of each chamber by each hush tube and pipe, the high temperature, the high speed pulse pneumatic that enter in the silencing apparatus are transformed into the more stable air-flow that temperature is lower, airspeed is lower, thereby the strong noise value of the air-flow of pulsation generation drops to lower noise figure at a high speed, reaches the noise reduction purpose.

Moreover, all be an end opening also because of each pipe, the other end sealing, air-flow can only or suck from aperture ejection on the pipe, and makes each hush tube airflow direction all do to change 90 °, the process of gas from the intake noise reduction pipe to the exhausting silencer pipe, air-flow harmony wave current direction constantly changes, and air-flow and sound wave stream is broken away from, and have part to be 180 ° of motions of opposite direction, the damping coefficient of sound wave increases, and noise descends.Simultaneously, because each hush tube all adopts spray or suction structure, a big strand air-flow is dispersed into the ejection of hundreds of thigh little airflow, is subjected to the rubbing action of little hole wall in the sound wave transmittance process, noise descends; In addition, spray, inhale flow structure and also have the shift frequency effect, low frequency can be shifted to middle and high frequency, be convenient to eliminate the noise, and with middle and high frequency displacement to the unheard ultra-high frequency of people's ear, play the effect that reduces noise.Also the air-flow (sound wave) because of aperture ejection on each hush tube has phase difference, crest and the trough part of can cancelling out each other, thus help noise reduction.Simultaneously, the air-flow (sound wave) that comes out from chamber I is subjected to the interference effect of chamber II air-flow, and phase difference is also arranged, and also can reduce partial noise.

Beneficial effect of the present utility model is: but the airspeed in the outlet pipe of exhaust silencer for internal-combustion engine remain in a certain optimum value, make the insertion loss (sound deadening capacity) of silencing apparatus remain at maximum value, power loss ratio remains at minimum value.Experimental results show that: when little load, the slow-speed of revolution, the exhaust simultaneously of single elongate pipe vent ratio double joint pipe reduces noise 5-8dB (A); High rotating speed, when loading greatly, the exhaust simultaneously of double joint pipe reduces noise 5-10dB (A) than the exhaust of single elongate pipe again.

Description of drawings

Fig. 1 is the structural representation of traditional exhaust silencer for internal-combustion engine.

Among Fig. 1: 1 ' be the intake noise reduction pipe, 2 ' be front cover, 3 ' be housing, 4 ' be dividing plate, 5 ' be dividing plate, 6 ' be dividing plate, 7 ' be the exhausting silencer pipe, 8 ' be rear end cover.

Fig. 2 is a structural drawing of the present utility model.

Fig. 3 is the A-A sectional view of Fig. 2.

Fig. 4 is the B-B sectional view of Fig. 2.

Fig. 5 is the structural drawing of first kind of embodiment (Hand-operated butterfly valve) of gas exhausting valve in the utility model, is illustrated as closed state.

Fig. 6 is the opening state figure of Fig. 5.

Fig. 7 is the structural drawing of second kind of embodiment (one-way valve) of gas exhausting valve in the utility model.

Among the figure: the 1st, front cover, the 2nd, housing, the 3rd, dividing plate, the 4th, intake noise reduction pipe, the 5th, middle hush tube, the 6th, dividing plate, the 7th, dividing plate, the 8th, rear end cover, the 9th, short and thick exhausting silencer pipe, the 10th, gas exhausting valve, the 11st, exhausting silencer pipe, the 12nd, pore, the 13rd, middle hush tube, the 14th, pore, the 15th, rotating handle bar, the 16th, valve shaft, the 17th, valve plate, the 18th, valve seat, the 19th, valve plate, the 20th, spring, the 21st, fixed base plate, the 22nd, exhaust port.

Embodiment

The utility model is further described below in conjunction with embodiment's (accompanying drawing), but does not limit the utility model.

As Fig. 2,3, shown in 4, the variable exhaust silencer for internal-combustion engine of outlet pipe sectional area of the present utility model comprises by preceding, the housing 2 that rear end cover and hollow cylinder are formed, and be arranged on the exhausting silencer pipe 9 and 11 that is processed with a plurality of pores on the intake noise reduction pipe 4 that is processed with a plurality of pores on the root canal wall in housing 2 inner chambers and two root canal walls, described housing inner chamber is by setting gradually dividing plate 3 from front to back, 6,7 are separated into four chamber II, I, III, IV, described dividing plate 3, all offer the pore 12 and 14 in chamber before and after being communicated with on 7, the closed end of described intake noise reduction pipe 4 passes front cover 1 successively, the through hole that processes on the dividing plate 3 enters chamber II, I, terminate in dividing plate 6, and with dividing plate 6 Joints; Described exhausting silencer pipe is made up of diameter, two exhausting silencer pipes 9 and 11 that length is different, the closed end of two exhausting silencer pipes passes the through hole that processes on the rear end cover 8 respectively and enters chamber IV, terminate in dividing plate 7, and with dividing plate 7 Joints, in two exhausting silencer pipes big, the length of diameter the opening end of a short short and thick exhausting silencer pipe 9 be provided with Hand-operated butterfly valve 10; This Hand-operated butterfly valve 10 comprises by valve shaft 16 and is installed in exhausting silencer pipe 9 intraluminal valve plates 17, with the rotating handle bar 15 that combines with valve shaft 16 overhanging ends, this rotating handle bar 15 is by traction steel rope of cable be connected with steel wire pull-button in being arranged on operator cabin (shown in Fig. 5,6); In chamber II, I, III, be provided with the middle hush tube 5 and 13 that is processed with a plurality of pores on two root canal walls in the mode that is parallel to intake noise reduction pipe 4 axis, the opening end of this centre hush tube is positioned at chamber II, and its closed end is positioned at chamber III, and with dividing plate 7 Joints; The area sum of hush tube cross section is greater than the area of the cross section of intake noise reduction pipe in the middle of two; Described pore is all processed and is being arranged on the tube wall section of chamber III, and the area sum of a plurality of pores is greater than the area of middle hush tube cross section.

The pipe of intake noise reduction described in the utility model 4 is arranged in pore quantity on the tube wall section of chamber I more than the stomatal number that is arranged on the chamber II tube wall section, and on two sections tube wall sections the area sum of pore greater than the area of intake noise reduction pipe cross section; The gross area of a plurality of pores that process on the described exhausting silencer tube wall is greater than the area of exhausting silencer pipe cross section; Described chamber I＞chamber IV＞chamber III＞chamber II; The area sum of set pore 14 is greater than the area of intake noise reduction pipe 4 cross sections on the described dividing plate 3, and the area sum of set pore 12 is greater than the area of intake noise reduction pipe 4 cross sections on the dividing plate 7.

In two exhausting silencer pipes described in the utility model less, the length of diameter the sectional area of the cross section of long elongated exhausting silencer pipe 11 less than the area of intake noise reduction pipe 4 cross sections; And the area of short and thick exhausting silencer pipe 9 cross sections that diameter is big, length is lacked is greater than the area of intake noise reduction pipe 4 cross sections.

Gas exhausting valve described in the utility model also can adopt one-way valve as shown in Figure 7, this unidirectional gas exhausting valve comprises and is positioned at exhausting silencer pipe 9 intraluminal valve seats 18, match with valve seat 18 by valve plate 19, fixed base plate 21, be arranged on the spool that the spring 20 between valve plate and the fixed base plate constitutes, on fixed base plate 21, offer the exhaust port 22 that is connected with atmosphere.Its working principle is as follows: when the load increase of internal-combustion engine, when rotating speed reaches a certain value, because the pressure among the chamber IV increases, pressure difference overcomes the elastic force of unidirectional gas exhausting valve, and unidirectional gas exhausting valve is backed down, and the major part of gas just can be discharged by short and thick exhausting silencer pipe among the chamber IV, fraction is discharged by elongated exhausting silencer pipe, realize two-tubely working simultaneously, make and discharge airspeed and be controlled in the optimum range, exhaust sound is minimum.When a certain value was led in airspeed decline, along with the valve that reduces of pressure is also closed thereupon, short and thick exhausting silencer pipe quit work.

Claims

1, the variable exhaust silencer for internal-combustion engine of a kind of outlet pipe sectional area, it comprises by preceding, the housing (2) that rear end cover and hollow cylinder are formed, and be arranged on the exhausting silencer pipe that is processed with a plurality of pores on the intake noise reduction pipe (4) that is processed with a plurality of pores on the root canal wall in housing (2) inner chamber and at least one root canal wall, described housing inner chamber is by setting gradually dividing plate (3) from front to back, (6), (7) be separated into four chambers (II), (I), (III), (IV), described dividing plate (3), (7) all offer the pore in chamber before and after being communicated with on, it is characterized in that: the closed end of described intake noise reduction pipe (4) passes front cover (1) successively, the through hole that processes on the dividing plate (3) enters chamber (II), (I), terminate in dividing plate (6), and combine with dividing plate (6); Described exhausting silencer pipe is made up of diameter, two exhausting silencer pipes (9) and (11) that length is different, the closed end of two exhausting silencer pipes passes the through hole that processes on the rear end cover (8) respectively and enters chamber (IV), terminate in dividing plate (7), and combine with dividing plate (7), in two exhausting silencer pipes big, the length of diameter the opening end of a short short and thick exhausting silencer pipe (9) be provided with gas exhausting valve (10); In chamber (II), (I), (III), be provided with the middle hush tube that is processed with a plurality of pores at least one root canal wall in the mode that is parallel to intake noise reduction pipe (4) axis, the opening end of this centre hush tube is positioned at chamber (II), its closed end is positioned at chamber (III), and combines with dividing plate (7).

2, the variable exhaust silencer for internal-combustion engine of outlet pipe sectional area according to claim 1, it is characterized in that: be provided with middle hush tube (5) and (13) that are processed with a plurality of pores on two root canal walls in the mode that is parallel to intake noise reduction pipe (4) axis in chamber (II), (I), (III), hush tube cross sectional area sum is greater than the cross sectional area of intake noise reduction pipe in the middle of two; Described pore is all processed and is being arranged on the tube wall section of chamber III, and the area sum of a plurality of pores is greater than middle hush tube cross sectional area.

3, the variable exhaust silencer for internal-combustion engine of outlet pipe sectional area according to claim 1 is characterized in that: described gas exhausting valve (10) is a Hand-operated butterfly valve.

4, the variable exhaust silencer for internal-combustion engine of outlet pipe sectional area according to claim 1, it is characterized in that: described intake noise reduction pipe (4) is arranged in pore quantity on the tube wall section of chamber (I) more than the stomatal number that is arranged on chamber (II) the tube wall section, and on two sections tube wall sections the area sum of pore greater than intake noise reduction pipe (4) cross sectional area.

5, the variable exhaust silencer for internal-combustion engine of outlet pipe sectional area according to claim 1, it is characterized in that: the area sum of a plurality of pores that process on the described exhausting silencer tube wall is greater than exhausting silencer pipe cross sectional area.

6, according to claim 1 or the variable exhaust silencer for internal-combustion engine of described outlet pipe sectional area, it is characterized in that: described chamber (I)＞chamber (IV)＞chamber (III)＞chamber (II).

7, according to claim 1 or the variable exhaust silencer for internal-combustion engine of described outlet pipe sectional area, it is characterized in that: described dividing plate (3) is gone up area sum, the dividing plate (7) of set pore (14) and is gone up the area sum of set pore (12) all greater than intake noise reduction pipe (4) cross sectional area.

8, according to claim 1 or the variable exhaust silencer for internal-combustion engine of described outlet pipe sectional area, it is characterized in that: elongated exhausting silencer pipe (11) cross sectional area that diameter is less in two exhausting silencer pipes, length is long is less than intake noise reduction pipe (4) cross sectional area; And short and thick exhausting silencer pipe (9) cross sectional area that diameter is big, length is short is greater than the cross sectional area of intake noise reduction pipe (4).