CN2864112Y

CN2864112Y - Complex air pump

Info

Publication number: CN2864112Y
Application number: CNU2006200017821U
Authority: CN
Inventors: 郭才冬
Original assignee: Chongqing Zongshen Technology Development and Research Co Ltd
Current assignee: Chongqing Zongshen Engine Manufacturing Co Ltd
Priority date: 2006-02-14
Filing date: 2006-02-14
Publication date: 2007-01-31
Anticipated expiration: 2016-02-14

Abstract

The present utility model relates to a complex air pump, including a vacuum diaphragm and a second intake structure composed of a reed valve. The vacuum chamber connected in vacuum with an oil carburetor is disposed in the upper vacuum diaphragm, and solidly connected a link pole which is the hollow structure, with one end connected to the vacuum chamber, the other end connected to a one-way ball valve by a connector, wherein the other end of the said one-way ball valve is connected to the engine exhaust pipe. In the high-speed or slowing process of the engine, the one-way ball valve introduces the exhaust gas into the vacuum chamber, to recirculate the exhaust, thus achieving the function of saving the fuel, and reducing the exhaust pollution. When the engine operates normally, the present utility model may introduce fresh air into the engine exhaust emissions road to mix with the exhaust gas to combust again, in order to reduce the engine exhaust pollution and achieve outer purifier punction. The present utility model integrates the structure of the second exhaust gas recirculation and the second intake system as a whole, which allows the status of each engine emissions to have a more thorough decontamination.

Description

Compound air pump

Technical field

The utility model relates to a kind of air pump, and particularly a kind of both had a motor secondary air inlet system, has the compound air pump of exhaust gas recirculation structure again.

Background technique

The air pump that present motorcycle engine is adopted is combined by a vacuum diaphragm plate valve and a leaf valve usually, the waste gas mixing that enters engine exhaust road and motor discharge by the introducing fresh air is burnt to reduce the engine exhaust pollution again, and the realization external purification is the effect of secondary air inlet.Just on the waste gas of discharging behind the engine combustion, therefore known air pump has significant limitation to the catharsis of waste gas in the effect of its purifying engine waste gas.

The operating conditions of motor is the process of a complexity, and the operating conditions variation of capable shape of the air flue of motor itself and motor all can impact the discharging of motor.Studies show that in a large number the engine operation condition variation causes engine exhaust emission to increase following several situation: (1) motor is in moderating process, and the unexpected rising of air-intake negative-pressure can cause motor to suck too much fuel oil.This moment, motor was the process that a deceleration does not need a lot of power, and too much fuel oil not only makes energy waste, and the discharging of engine exhaust increases, and causes the pollution of atmosphere.(2) when the automobile downhill constant-speed driving, because of keeping the speed of a motor vehicle constant, so must turn down closure gradually, degree of vacuum in the suction tude is inevitable like this increases gradually, when increasing to a certain degree, degree of vacuum can cause motor to suck too much fuel oil equally, the discharging of engine exhaust is increased, cause pollution of atmosphere.The main cause that the deceleration negative pressure generates is, gas flow rates is very big under the very big situation of throttle opening, when closure reduces suddenly, after a large amount of gas in front flows to cylinder head, gas flow behind the closure has only seldom a part of gas to flow through owing to be subjected to stopping of closure, this just forms a degree of vacuum in the place of closure, and this will force too much part oil to flow out from main jet so.And this a part of oil is unwanted, and this has just formed pollution sources.By actual measurement, the deceleration negative pressure is far longer than the constant speed negative pressure, and this explanation is quickened and moderating process is the main process that generates waste gas, the waste gas that is produced when it is far longer than constant speed.And the actual deceleration process has almost accounted for 1/3 of automobile overall process, and therefore the reasonable control to negative pressure in acceleration and the moderating process has very significant meaning.

Inoperative defective when in addition, also there is high speed in known air pump.Motor oil consumption when running up is big, and discharge amount of exhaust gas is many, so the purified treatment in high engine speeds when running seems even more important.And the structural feature of known air pump makes its external purification that is mainly used in medium engine speed and low speed, and when motor during at high speed operation, because the restriction of its structure itself, leaf valve can't in time open and close, so the time external purification inoperative.

The model utility content

The purpose of this utility model is the technological deficiency at existing air pump, a kind of compound air pump that integrates secondary air inlet system and exhaust gas recirculation structure is provided, utilize exhaust gas recirculation and secondary air inlet dual mode that the waste gas of each operating mode of motor all is purified simultaneously, waste-gas cleaning is more thorough.

Another purpose of the present utility model is to solve air pump inoperative technical problem when high engine speeds turns round in the prior art, simultaneously, negative pressure during by exhaust gas recirculation structure control engine retard, avoid when slowing down, sucking too much fuel oil, make fuel consume more economically, toxic emission further reduces.

To achieve these goals, the utility model provides a kind of compound air pump, comprise the secondary air inlet structure that a vacuum diaphragm and a reed valve constitute, described vacuum diaphragm top is provided with the vacuum chamber that is communicated with carburetor vacuum, and an affixed connecting rod, described connecting rod is a hollow structure, one end and described vacuum chamber, the other end is connected with a non-return valve by a connecting vessels, and the other end of described non-return valve is connected with engine exhaust pipe.

Described non-return valve comprises a guide tube, the affixed fixed cover of one end of described guide tube, the other end is connected with engine exhaust pipe, one boss is set in the chamber, one little return spring and steel ball are arranged between described fixed cover and the boss, also are provided with the guide port that is connected with described connecting vessels on the sidewall of described guide tube.

An also affixed seal closure on the described connecting rod is provided with a return spring between described seal closure and the described vacuum diaphragm.The sidewall of cavity is provided with an exhaust apertures between described vacuum diaphragm and the described seal closure, and described exhaust apertures is communicated with the waste gas interface that is connected flue gas leading, and described reed valve is arranged on the passage of described exhaust apertures and the connection of waste gas interface.Described reed valve also is connected with the leaf valve backplate.

In technique scheme, described connecting vessels is a bellows, and further, described bellows is folding rubber pipe.

The utility model is producing on the in-depth analysis basis of reason existing air pump operation characteristic and technical problem thereof, the operating mode characteristics of binding engine generation exhaust emission pollution in service provide a kind of compound air pump that integrates secondary air inlet system and exhaust gas recirculation structure.Core of the present utility model is to have increased by a non-return valve, and one has the connecting vessels of bellows structure, and connecting rod is designed to hollow structure.One end of non-return valve is communicated with the engine exhaust pipeline, be used for introducing when needed waste gas, the other end forms a waste gas transfer passage by the connecting rod of connecting vessels, hollow, is used for waste gas that the engine exhaust pipe pass the is gone into connecting rod by connecting vessels and hollow and is sent to vacuum chamber.When high engine speeds turns round, utilize the bigger characteristics of exhaust pressure this moment, non-return valve is opened, waste gas is introduced vacuum chamber.When engine retard, utilize the characteristics that air-intake negative-pressure raises, connecting rod moves up, produce negative pressure by connecting vessels, non-return valve is opened, waste gas is introduced vacuum chamber.When motor is normally exercised, draw fresh air and reach the external purification effect.

The utility model non-return valve adopts simple and direct design, simple structure by little return spring, steel ball and boss, to guide that sealed separation becomes two air chambers in the tube chamber: the valve cup that is communicated with engine exhaust pipe and with valve that connecting vessels is communicated with after the chamber, and, make the utility model only adopt a nested structure just to finish the opening and closing of unidirectional ball valve under high engine speeds, two kinds of different operating modes of deceleration effectively, reliably by the pressure reduction of chamber and the pretightening force and the restoring force of little return spring behind valve cup and the valve.The utility model has adopted the connecting vessels of bellows structure, makes its proper functioning under the high engine speeds state, plays the effect that produces negative pressure, non-return valve is opened again when engine retard.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Description of drawings

Fig. 1 is the utility model compound air pump structural representation;

Fig. 2 is the utility model connecting rod structural representation;

Fig. 3 is the structural representation of the utility model non-return valve;

Fig. 4 a is a fixed cover structural representation in the utility model non-return valve;

Fig. 4 b is the side cutaway view of Fig. 4 a;

Fig. 5 is the utility model non-return valve supporting structure schematic representation;

Fig. 6 is the folding rubber pipe structural representation of the utility model.

Description of reference numerals:

The 1a-vacuum chamber; The 1b-exhaust chamber; The 1c-suction chamber; 2-vacuum diaphragm;

The 3-return spring; The 4-connecting rod; The 4a-hollow cavity; The 5-seal closure;

The 6-guide tube; The 6a-boss; The 6b-guide port; 6c-valve cup;

Chamber behind the 6d-valve; The 7-steel ball; The 8-exhaust apertures; 9-reed valve;

10-leaf valve backplate; 11-waste gas interface; The 12-clamp; The 13-connecting vessels;

The 14-fixed cover; The little return spring of 15-; The 16-non-return valve; The 17-intake interface;

The 18-pump housing; 19-Carburetor interface; The 21-support.

Embodiment

Fig. 1 is the utility model compound air pump structural representation, and its main structure body comprises a diaphragm valve, a leaf valve and a non-return valve, constitutes both to have had the secondary air inlet system, has the compound air pump structure of exhaust gas recirculation again.Particularly, the cavity body structure that the pump housing 18 is opened wide for upper-end surface sealing, lower end mouth forms exhaust chamber 1b in the chamber.One exhaust apertures 8 is set on the sidewall of the pump housing 18, and exhaust apertures 8 is communicated with the waste gas interface 11 that is connected flue gas leading, and the communication passage of exhaust apertures 8 and waste gas interface 11 is provided with reed valve 9 and leaf valve backplate 10, forms leaf valve.When the gas pressure in the exhaust chamber 1b reached setting value, reed valve 9 was opened, and the air in the exhaust chamber 1b is discharged into flue gas leading, carries out external purification.The upper end of Carburetor interface 19 is connected with Carburetor, and the lower end is fixed on the last Closed End of the pump housing 18.An affixed connecting rod 4 on the vacuum diaphragm 2, and make the top of Carburetor interface 19 form the vacuum chamber 1a that is communicated with carburetor vacuum.Vacuum diaphragm 2 is used to reflect the negative pressure variation of vacuum chamber 1a, and when the degree of vacuum of vacuum chamber 1a increased, vacuum diaphragm 2 was subjected to the effect of vacuum chamber 1a negative-pressure sucking, produces upwards distortion, and drive connecting rod 4 moves upward together.The lower end of intake interface 17 is connected with gas handling system, and the lower end mouth of the affixed pump housing 18 in upper end forms suction chamber 1c.One seal closure 5 affixed with connecting rod 4 also is set in the chamber of the pump housing 18, a return spring 3 is set between the upper-end surface of the seal closure 5 and the pump housing 18.Seal closure 5 moves up and down under the elastic force effect of the pulling of connecting rod 4 and return spring 3, exhaust chamber 1b and suction chamber 1c is communicated with or isolated.

Fig. 2 is the utility model connecting rod structural representation, connecting rod 4 is for having the hollow structure of hollow cavity 4a, has double action, upper-end surface, return spring 3 and the seal closure 5 of one side by passing vacuum diaphragm 2, the pump housing 18 successively, the hollow cavity 4a of connecting rod 4 is communicated with vacuum chamber 1a, forms the transmission channel that is communicated with vacuum chamber 1; On the other hand by affixed with vacuum diaphragm 2 and seal closure 5 respectively, make vacuum diaphragm 2, connecting rod 4 and seal closure 5 form a double-action mechanism, improve with vacuum chamber 1a degree of vacuum, therefore the 2 upwards deformation of generation of vacuum diaphragm drive connecting rod 4 and seal closure 5 moves upward together.

Fig. 3 is the structural representation of the utility model non-return valve, one end of non-return valve 16 is communicated with the engine exhaust pipeline, be used for introducing when needed waste gas, the other end is communicated with the hollow cavity 4a of connecting rod 4 by a connecting vessels 13, is used for waste gas that the engine exhaust pipe pass the is gone into hollow cavity 4a by connecting vessels 13 and connecting rod 4 and is sent to vacuum chamber 1.Specifically, non-return valve 16 comprises guide tube 6, little return spring 15, steel ball 7 and guide port 6b.Guide tube 6 is a cavity body, and a boss 6a is set in the chamber, the affixed fixed cover 14 of end face, and guide port 6b is arranged on the sidewall of guide tube 6, is communicated with connecting vessels 13.Little return spring 15 and steel ball 7 are arranged in the chamber of guide tube 6, and are connected between fixed cover 14 and the boss 6a.Return little spring 15 has certain pretightening force, continue to exert pressure to steel ball 7, steel ball 7 and boss 6a are closely cooperated, sealed separation in guide tube 6 chambeies is become two air chambers: the valve cup 6c that is communicated with engine exhaust pipe and with valve that connecting vessels 13 is communicated with after chamber 6d, form the closed state of non-return valve 16.When the pressure difference (being the pressure reduction of steel ball 7 both sides) of chamber 6d behind valve cup 6c and the valve is increased to when being enough to overcome the pretightening force of return little spring 15, steel ball 7 is to the direction motion of leaving boss 6a, engine exhaust enters from the gap between steel ball 7 and the boss 6a, chamber 6d is communicated with after making valve cup 6c and valve, forms the opening state of non-return valve 16.Engine exhaust enters vacuum chamber 1 through the hollow cavity 4a of guide port 6b, connecting vessels 13, connecting rod 4 successively, realizes exhaust gas recirculation of the present utility model.Fig. 4 a is a fixed cover structural representation in the non-return valve, and Fig. 4 b is the side cutaway view of Fig. 4 a.

Fig. 5 is the utility model non-return valve supporting structure schematic representation, and an end of support 21 is connected with guide tube 6, and the other end is fixed on the junction surface of the pump housing 18 and intake interface 17.This structural design makes the utility model non-return valve 16 become a stable whole structure, under the various states of the actual use of motorcycle, all can keep its reliably working.

Fig. 6 is the folding rubber pipe structural representation of the utility model.Because connecting rod 4 moves up and down in the utility model actual motion, non-return valve 16 then maintains static, so the utility model is provided with connecting vessels 13 between the hollow cavity 4a of the guide port 6b of non-return valve 16 and connecting rod 4, no matter connecting rod 4 all can be realized the transmission of waste gas in what position.In the utility model optimal technical scheme, connecting vessels 13 adopts bellows structure, adopts folding rubber pipe further, is connected with guide port 6b with connecting rod 4 respectively by clamp 12.In connecting rod 4 moving process, the connecting vessels 13 of bellows structure will produce Volume Changes, and then change in the guide tube 6 pressure of chamber 6d behind the valve, promptly change the pressure reduction of chamber 6d behind valve cup 6c and the valve.Specifically, when connecting rod 4 moves up (increase of vacuum chamber 1a degree of vacuum), bellows elongates, produce negative pressure in it, then the pressure of chamber 6d reduces behind the valve, and the pressure reduction of chamber 6d increases behind valve cup 6c and the valve, when pressure reduction is increased to certain value, non-return valve 16 is opened, and waste gas will enter vacuum chamber 1a, lowers the degree of vacuum of vacuum chamber 1a.After the degree of vacuum of vacuum chamber 1a reduced, connecting rod 4 moved down, and bellows shortens, and negative pressure fades away in it, and the pressure reduction of chamber 6d reduces behind valve cup 6c and the valve, and when pressure reduction was reduced to the pretightening force that can not overcome little return spring 15, non-return valve 16 sealed once more.The utility model is by the ingenious design to connecting vessels 13, make the utility model not only realize the exhaust gas recirculation of fast state, exhaust gas recirculation when also having realized engine retard simultaneously, the effect that be implemented in effectively and save fuel oil under the various working staties of motor, reduces toxic emission.

The working procedure of known air pump is such: when high engine speeds turned round, because Carburetor interface 19 communicates with the closure vacuum chamber, the degree of vacuum of vacuum chamber 1 constantly increased, and made 2 distortion of vacuum diaphragm, produced the active force of pulling connecting rod 4.When degree of vacuum reached certain value, the active force that 2 distortion of vacuum diaphragm produce can overcome the pretightening force of return spring 3, and vacuum diaphragm 2 pulling connecting rods 4 and seal closure 5 are moved up together.Engine speed further improves, and seal closure 5 will rise to the extreme higher position, and promptly seal closure 5 seals exhaust chamber 1b fully, suction chamber 1c and exhaust chamber 1b is isolated, and at this moment, reed valve 9 no longer works, air can not enter flue gas leading, so external purification is inoperative.

The utility model is on the architecture basics of known air pump, increased non-return valve 16, and connecting rod 4 is designed to have the hollow structure of hollow cavity 4a, transmission channel by non-return valve 16, connecting vessels 13 and hollow cavity 4a formation to vacuum chamber 1 conveying waste gas, both constituted and to have carried out external purification by secondary air inlet, further reduced the compound air pump structure of exhaust emissions again by exhaust gas recirculation.According to the technical solution of the utility model, when high engine speeds turns round, because exhaust pressure is bigger, the pressure of the valve cup 6c of the utility model non-return valve 16 also can be bigger, the pressure reduction of chamber 6d behind bigger valve cup 6c and the valve (being the pressure reduction of steel ball 7 both sides) can make non-return valve 16 be in opening state, waste gas enters from non-return valve 16, and the hollow cavity 4a by connecting vessels 13 and connecting rod 4 enters vacuum chamber 1.Waste gas enters the degree of vacuum that vacuum chamber 1 reduces vacuum chamber 1 on the one hand, makes seal closure 5 keep exhaust chamber 1b and suction chamber 1c to be communicated with, and reed valve 9 is played the air in the exhaust chamber 1b is discharged into the effect that flue gas leading carries out external purification; Make waste gas enter engine air inlet tube on the other hand again, and burning once more in motor, both saved fuel oil, reduced the pollutant in the exhaust emissions again.

When engine retard, air-intake negative-pressure raises suddenly.Because Carburetor interface 19 communicates with the closure vacuum chamber, the also corresponding increase of the degree of vacuum of vacuum chamber 1 makes 2 distortion of vacuum diaphragm, produces the active force of pulling connecting rod 4.When the active force of vacuum diaphragm 2 generations can overcome the pretightening force of return spring 3, vacuum diaphragm 2 pulling connecting rods 4 and seal closure 5 moved up together.In connecting rod 4 moves up process, to produce certain negative pressure in the connecting vessels 13, make that the pressure of chamber 6d decreases behind the valve that is communicated with connecting vessels 13, the pressure reduction (pressure reduction of steel ball 7 both sides) that is chamber 6d behind valve cup 6c and the valve increases, and impels the little return spring 15 of steel ball 7 compressions from the exhaust pressure of outlet pipe.When the pressure reduction of chamber 6d behind valve cup 6c and the valve was increased to certain value, non-return valve 16 was opened, and waste gas enters vacuum chamber 1 by non-return valve 16, connecting vessels 13 and hollow cavity 4a.After waste gas enters vacuum chamber 1, the degree of vacuum of vacuum chamber 1 reduces, connecting rod 4 is moved down, negative pressure in the connecting vessels 13 fade away, and increase the pressure reduction of chamber 6d reduction behind valve cup 6c and the valve with the pressure of chamber 6d behind the valve that connecting vessels 13 is communicated with, steel ball 7 resets under the restoring force effect of little return spring 15, non-return valve 16 cuts out, and cuts off exhaust-gas flow, to guarantee the speed stability of motor.When connecting rod 4 moved down, return spring 3 impelled seal closure 5 to move down, and the air in the exhaust chamber 1b to flue gas leading, guarantees that external purification is unaffected by reed valve 9 rows.The above-mentioned process that waste gas is introduced vacuum chamber 1 can be stabilized in the peak of air-intake negative-pressure under the certain value on the one hand, avoids motor to cause because of air-intake negative-pressure is too high sucking too much fuel oil, plays the effect that reduces oil consumption; On the other hand, waste gas can further enter engine air inlet tube, realizes the exhaust gas recirculation utilization, plays further saving fuel oil, further reduces the effect of toxic emission.

When motor was normally exercised, the utility model drew fresh air by reed valve 9 and enters waste gas that engine exhaust road and motor discharge and mix to burn again and pollute to reduce engine exhaust, reaches the effect of external purification.

In sum, the utility model makes exhaust gas recirculation and secondary air inlet dual mode utilize simultaneously, makes the waste gas of each operating mode of motor all be purified, and makes waste-gas cleaning more thorough.

It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.

Claims

1. compound air pump, comprise the secondary air inlet structure that a vacuum diaphragm (2) and a reed valve (9) constitute, described vacuum diaphragm (2) top is provided with the vacuum chamber (1a) that is communicated with carburetor vacuum, an and affixed connecting rod (4), it is characterized in that described connecting rod (4) is a hollow structure, the one end is communicated with described vacuum chamber (1a), the other end is connected with a non-return valve (16) by a connecting vessels (13), and the other end of described non-return valve (16) is connected with engine exhaust pipe.

2. compound air pump as claimed in claim 1, it is characterized in that, described non-return valve (16) comprises a guide tube (6), the affixed fixed cover of one end of described guide tube (6) (14), the other end is connected with engine exhaust pipe, one boss (6a) is set in the chamber, and a little return spring (15) and a steel ball (7) are arranged between described fixed cover (14) and the boss (6a), also are provided with the guide port (6b) that is connected with described connecting vessels (13) on the sidewall of described guide tube (6).

3. compound air pump as claimed in claim 1 is characterized in that, described connecting rod (4) is gone up an also affixed seal closure (5), is provided with a return spring (3) between described seal closure (5) and the described vacuum diaphragm (2).

4. as claim 1 or 3 described compound air pumps, it is characterized in that, the sidewall of cavity is provided with an exhaust apertures (8) between described vacuum diaphragm (2) and the described seal closure (5), described exhaust apertures (8) is communicated with the waste gas interface (11) that is connected flue gas leading, and described reed valve (9) is arranged on the passage of described exhaust apertures (8) and waste gas interface (11) connection.

5. compound air pump as claimed in claim 4 is characterized in that, described reed valve (9) also is connected with leaf valve backplate (10).

6. compound air pump as claimed in claim 1 or 2 is characterized in that, described connecting vessels (13) is a bellows.

7. compound air pump as claimed in claim 6 is characterized in that, described bellows is folding rubber pipe.