CN100422517C

CN100422517C - Compound air pump

Info

Publication number: CN100422517C
Application number: CNB2006100074975A
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: 2008-10-01
Anticipated expiration: 2026-02-14
Also published as: CN101021176A

Abstract

The present invention relates to a combined air pump. It includes a secondary air intake structure formed from a vacuum diaphragm and a reed valve, in the upper portion of the described vacuum diaphragm a vacuum chamber is set, said vacuum chamber is communicated with a carburetor and fixedly connected with a connecting bar. The described connecting bar is hollow structure, its one end is communicated with the described vacuum chamber, and its another end is connected with a ball check valve by means of a communicating vessel, another end of the described ball check valve is connected with engine exhaust pipe. Said invention also provides the working principle of said combined air pump and its concrete operation method.

Description

Compound air pump

Technical field

The present invention relates to a kind of air pump, 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, realizing that 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, 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, the unexpected rising of air-intake negative-pressure can cause motor to suck too much fuel oil. and this moment, motor was the process that a deceleration does not need a lot of power, too much fuel oil not only makes energy waste, and the discharging of engine exhaust increases, cause the pollution of atmosphere. (2) are 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, causing 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, this will force too much part oil to flow out from main jet so. and this a part of oil is unwanted, this has just formed pollution sources. by actual measurement, the deceleration negative pressure is far longer than the constant speed negative pressure, 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, therefore the reasonable control to negative pressure in acceleration and the moderating process has very significant meaning.

In addition, inoperative defective when also there is high speed in known air pump. motor oil consumption when running up is big, discharge amount of exhaust gas is many, so the purified treatment during the high engine speeds running seems even more important. and the structural feature of known air pump makes it be mainly used in the external purification of medium engine speed and low speed, 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.

Summary of the invention

The objective of the invention is defective and 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 simultaneously, the waste gas of each operating mode of motor all is purified, and waste-gas cleaning is more thorough.

Another object of the present invention 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 invention 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, being 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, 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. and 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 present invention 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, a kind of compound air pump that integrates secondary air inlet system and exhaust gas recirculation structure is provided. core of the present invention is to have increased by a non-return valve, one has the connecting vessels of bellows structure, and connecting rod being designed to hollow structure. an end of non-return valve is communicated with the engine exhaust pipeline, be used for introducing when needed waste gas, the other end passes through connecting vessels, the connecting rod of hollow forms a waste gas transfer passage, be used for waste gas that the engine exhaust pipe pass the is gone into connecting rod by connecting vessels and hollow and be 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 air-intake negative-pressure to raise, the characteristics that 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.

Non-return valve of the present invention adopts simple and direct design, by little return spring, the simple structure of 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 by the pressure reduction of chamber and the pretightening force and the restoring force of little return spring behind valve cup and the valve, make the present invention only adopt a nested structure just effectively, finished high engine speeds reliably, the opening and closing of unidirectional ball valve under the two kinds of different operating modes of slowing down. the present invention has adopted the connecting vessels of bellows structure, make its proper functioning under the high engine speeds state, when engine retard, play the generation negative pressure again, the effect that non-return valve is opened.

The invention enables exhaust gas recirculation and secondary air inlet dual mode to utilize simultaneously, make the waste gas of each operating mode of motor all be purified, make waste-gas cleaning more thorough.

Below by drawings and Examples, technological scheme of the present invention is described in further detail.

Description of drawings

Fig. 1 is a compound air pump structural representation of the present invention;

Fig. 2 is a connecting rod structural representation of the present invention;

Fig. 3 is the structural representation of non-return valve of the present invention;

Fig. 4 a is fixed cover structural representation in the non-return valve of the present invention;

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

Fig. 5 is a non-return valve supporting structure schematic representation of the present invention;

Fig. 6 is the folding rubber pipe structural representation of the present invention.

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 a compound air pump structural representation of the present invention, its main structure body comprises a diaphragm valve, one leaf valve and a non-return valve, constitute and both had the secondary air inlet system, the compound air pump structure that has exhaust gas recirculation again. particularly, the pump housing 18 is the upper-end surface sealing, the cavity body structure that lower end mouth is opened wide, on the sidewall of the formation exhaust chamber 1b. pump housing 18 exhaust apertures 8 is set in the chamber, exhaust apertures 8 is communicated with the waste gas interface 11 that is connected flue gas leading, the communication passage of exhaust apertures 8 and waste gas interface 11 is provided with reed valve 9 and leaf valve backplate 10, form leaf valve. when the gas pressure in the exhaust chamber 1b reaches setting value, reed valve 9 is opened, air in the exhaust chamber 1b is discharged into flue gas leading, carry out external purification. the upper end of Carburetor interface 19 is connected with Carburetor, 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 the negative pressure variation that the vacuum chamber 1a. vacuum diaphragm 2 that is communicated with carburetor vacuum is used to reflect vacuum chamber 1a has been formed at the top that makes Carburetor interface 19, when the degree of vacuum of vacuum chamber 1a increases, vacuum diaphragm 2 is subjected to the effect of vacuum chamber 1a negative-pressure sucking, produce upwards distortion, and drive connecting rod 4 moves upward together. the lower end of intake interface 17 is connected with gas handling system, the lower end mouth of the affixed pump housing 18 in upper end, form a seal closure 5 affixed with connecting rod 4 also is set in the chamber of the suction chamber 1c. pump housing 18, one return spring, 3. seal closures 5 are set between the upper-end surface of the seal closure 5 and the pump housing 18 under the elastic force effect of the pulling of connecting rod 4 and return spring 3, move up and down, exhaust chamber 1b and suction chamber 1c are communicated with or isolated.

Fig. 2 is a connecting rod structural representation of the present invention, 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 non-return valve of the present invention, 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, be 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 be 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 are a cavity body, one boss 6a is set in the chamber, the affixed fixed cover 14 of end face, guide port 6b is arranged on the sidewall of guide tube 6, being communicated with connecting vessels 13. little return spring 15 and steel ball 7 are arranged in the chamber of guide tube 6, and being 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, forming the opening state of non-return valve 16. engine exhaust passes through guide port 6b successively, connecting vessels 13, the hollow cavity 4a of connecting rod 4 enters vacuum chamber 1, realizing exhaust gas recirculation of the present invention. 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 a non-return valve supporting structure schematic representation of the present invention, 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 non-return valve 16 of the present invention 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 present invention. because connecting rod 4 moves up and down in the actual motion of the present invention, non-return valve 16 then maintains static, so the present invention 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 optimal technical scheme of the present invention, connecting vessels 13 adopts bellows structure, adopt folding rubber pipe further, be 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, 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, waste gas will enter vacuum chamber 1a, lower the degree of vacuum of vacuum chamber 1a. after the degree of vacuum of vacuum chamber 1a reduces, connecting rod 4 moves down, bellows shortens, negative pressure fades away in it, the pressure reduction of chamber 6d reduces behind valve cup 6c and the valve, when pressure reduction is reduced to the pretightening force that can not overcome little return spring 15, non-return valve 16 seals once more. and the present invention is by the ingenious design to connecting vessels 13, make the present invention not only realize the exhaust gas recirculation of fast state, exhaust gas recirculation when also having realized engine retard simultaneously is implemented in effectively under the various working staties of motor and saves fuel oil, reduce the effect of toxic emission.

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

The present invention 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, by non-return valve 16, the transmission channel that connecting vessels 13 and hollow cavity 4a form to vacuum chamber 1 conveying waste gas, both constituted and to have carried out external purification by secondary air inlet, further reduce the compound air pump structure of exhaust emissions again by exhaust gas recirculation. according to technological scheme of the present invention, when high engine speeds turns round, because exhaust pressure is bigger, the pressure of the valve cup 6c of non-return valve 16 of the present invention 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, hollow cavity 4a by connecting vessels 13 and connecting rod 4 enters vacuum chamber 1. waste gas and enters the degree of vacuum that vacuum chamber 1 reduces vacuum chamber 1 on the one hand, make seal closure 5 keep exhaust chamber 1b and suction chamber 1c to be communicated with, 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, make 2 distortion of vacuum diaphragm, produce 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 move 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, impel the little return spring 15. of steel ball 7 compressions when the pressure reduction of chamber 6d behind valve cup 6c and the valve is increased to certain value from the exhaust pressure of outlet pipe, non-return valve 16 is opened, waste gas is by non-return valve 16, after connecting vessels 13 and hollow cavity 4a enter vacuum chamber 1. waste gas and enter 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 fades away, increase with the pressure of chamber 6d behind the valve that connecting vessels 13 is communicated with, the pressure reduction of chamber 6d reduces behind valve cup 6c and the valve, steel ball 7 resets under the restoring force effect of little return spring 15, non-return valve 16 cuts out, cut off exhaust-gas flow, to guarantee the speed stability of motor. when connecting rod 4 moves down, return spring 3 impels seal closure 5 to move down, air in the exhaust chamber 1b is arranged to flue gas leading by reed valve 9, the assurance external purification is unaffected. and 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, avoid motor to cause because of air-intake negative-pressure is too high sucking too much fuel oil, play 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 present invention 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 invention enables exhaust gas recirculation and secondary air inlet dual mode to utilize simultaneously, make the waste gas of each operating mode of motor all be purified, make waste-gas cleaning more thorough.

It should be noted last that, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although the present invention 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 technological scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.

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 according to 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 according to 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. compound air pump according to claim 3, 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 according to claim 4 is characterized in that, described reed valve (9) also is connected with leaf valve backplate (10).

6. compound air pump according to claim 1 and 2 is characterized in that, described connecting vessels (13) is a bellows.

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