DE1973194U - ARRANGEMENT IN AIR VALVE CARBURETTORS FOR COMBUSTION MACHINES. - Google Patents

Description

^ 57178 * -9.8.67

Th © Zenith Carburetter Company, .Limited

Arrangement for air valve carburetors for

Di @ invention relates to carburetors for internal combustion engines with © INEM formed as a slide valve air valve _β transversely au ..einem mixture passage in the carburetor body is beweglieh cut to a gap cross-= zn change the Gemlsehkanale ctee between the end ä © s Sehieberventils and an area wiriäe formed This gap is known as the throttle gap.

The slide valve penetrates the wall of the Se = in an opening Mixing channel at a point opposite the control surface and protrudes into a housing through which a membrane o «I © z» a Piston is divided into two chambers, in which the differential pressure The chamber closest to the (Jemisch Canal is to the Atmosphere or connected to a vacuum source

The wider chamber on the other side of the diaphragm baw _{o of} the piston is in connection with a mixing chamber of the carburettor, i.e. with that part of the Gemiachkanal _s that was between the slide valve and a downstream throttle valve. The slide valve is operated by a spring pressed against the control surface of the 6 © misoh canal

In such an arrangement in the first chamber (or of the diaphragm to the piston _e) searches dominant © pressure, the gate valve

raise and against the action of spring ¹ the throttle gap zn ver = größerm The amount of lift is growing in the Mass® in the won the internal combustion engine air is sucked into the mixing chamber

For various reasons it is desirable to change the actual flow rate in the mixing chamber with such a fermenter, to a certain extent independently of the movement of the slide valve

The invention is based on the task of enabling such a flow change and flow rate adjustment «

During the flow of the air stream to the mixing chamber takes place mainly through the throttle gap of the Sehieberventils _s finds a Leekstjpömung around the sides of the spool valve and through ■ tf a gap between the spool valve! # * Of the opening in d @ r wall of the mixture channel equipped This caused by manufacturing tolerances unavoidable! »reverse flow is different with each carburetor he exets = plar of the same type

Theoretically, it should be possible to set the throttle valve® to idle for several identical carburettors in the Weis®? that when the same weight of air flows through the one example, the same flow conditions are also present in the gap in all cases This has the consequence that the amount of fuel given to the air flow is still described, depending on the actual position of the gate valve and therefore the idling mixture is different for the individual carburettor specimens _O

It has geseigts that it is advantageous _p a © Einstellraöglichleit one not passing through the Drosaelspalt airway ahead see the carburetor better be able to adjust to idle ₀

The movement of the spool valve controls the lag © a VentilnadeX in the opening of a nozzle through which fuel in ä & n throttle gap ₉ is inserted so that the amount of fuel that varies drawn into the mixing passage at a certain suppressing _g wirct with the position of the Sehieberventils "

To avoid inclusion of toxic components as Monoxyä and nnver · = burned Hydrocarbonaten in AbgaseaÖer engine bu or reduce to a minimum, it is important _s that the fuel / air ~ ratio of regulating the engine cylinders gugeführten mixture within narrow limits "Di © present ® Invention through which a constant slide valve setting can be achieved when a given weight of air flows through the carburetor ₉ enables a correct fuel-air ratio = _{0 to be maintained}

Thus, the invention consists in ₉ characterized in that at an air valve Yergaser duroh for internal combustion engines with an air intake ports in a housing ^ which in a first chamber and a swexte chamber a b @ ~ wegliche wall is divided and a part connected to OCE movable wall gate valve $ which slides with play in an opening in the wall of the intake channel, this opening connecting the intake channel to the first chamber and the slide valve with a spring loaded slide valve with a control surface of the intake channel and a variable throttle gap between the throttle gap and a throttle valve mixing chamber _P which is in communication with the second chamber, while a pressure higher than the mixing chamber pressure is passed into the first chamber; according to the invention, an air path that does not pass through the throttle gap is provided »Whose passage cross-section is» adjustable «through at least one valve,

Thereby two valve® can be provided in aw © i separate airways * each of which can be adjusted by an outer valve® _e

One of the valve © can have a relatively large area while the other is set up for a narrow setting. It can be provided that the valve © _9, preferably the one with the larger organic area, is secured with a seal so that it Can only be adjusted after removing the seal _o

The one air path can establish a connection between the mixing chamber of the carburetor and the first chamber . the adjusting valve in this air = distance can be set to a fixed value ο

In the following, the invention is aa two embodiments below Referring to the figures explained in more detail

Fig. 1 shows a sectional elevation of a naeö. of the invention formed Vergasers _e

Figure 2 is a section: along line 2-2 of the figure Fig "3 is an elevation of a modified carburetor";

In the illustrated embodiments, two are independent mutually adjustable valves sur setting the in the mixing chamber However, it can be one of the Valves are omitted ^ if the air setting for one of the purposes described above is not required

The carburetor contains a body 1O ₉ through which a. Xlemlschkanal

11 with a circular cross-section extends »an air valve in the form of a slide valve 12 ₉ that slides across the channel 11» penetrates through an opening 13 on one side of the channel 11 »this slide valve

12 has a flat end face 14 »which is connected to a control surface 15 in Mixture channel 11 cooperated The control surface © 15 becomes ¥ © in one

»5 =

Rib formed in the periphery of the channel 11 ^ so daß.ein throttle gap 16 arises ^ whose Groß® VOA the position of the Sehieberventils 12 abhängte The control surface 15 is located on a bridging IT ₈ which he \ 18, and 19 sloping side surfaces ₉ so that the size of the Throttle gap 16 on both sides of the control surface 15 progressively increases or »decreases ο ·"

A throttle valve 21 is behind the slide valve 12 in the channel 11 arranged «The out between the slide valve 12 and the throttle valve 21 forms a mixing chamber 22 "

The slide valve 12 extends into a housing ₉ that is formed partly by the gasifier body 10 and partly by the lower part 23, "a flexible hanging membrane 24" which is attached to its inner edge on the slide valve 12 and to its outer edge between the carburetor body 10 and the cover part 25 is clamped in «divides the housing into two chambers 25? The upper chamber 25 facing away from the Gremisehkanal 11 communicates with the mixing chamber 22 via an opening 27 in the slide valve 12. The lower chamber 26 is connected to the atmosphere through an opening 28 mounted ₉ so that the slide valve 12 rests with its weight on the control surface 15 =, o Durdh a weak spring 29 is the expression of the slide = valves 12 enlarged The movements of the slide valve 12 are dampened by a damping device 51 The membrane 24 can of course also be replaced by a piston sliding in a cylinder «,

A chamber 32 serving for the fuel supply is below the bridging 1? "provided in this chamber 32 is promoted in a conventional WEIS® liquid fuel by a pump from a fuel tank ge = through a pivotably mounted float 33 ₉ of a not shown inlet valve ₉ controls is in the usual manner

Maintain a certain liquid level .. A fuel nozzle 34 which is arranged in the bridge 17 enables fuel to be sucked from the chamber 32 into the mixture channel 11 by the air flowing through the fuel nozzle 34. valve needle 35 as a function of the position of the slide valve 12, a free cross-section of the fuel nozzle 34 *

In that regard, enapricht the described construction of a conventional carburetor embodiment "When air by the suction effect in the cylinders of the internal combustion engine to which the Yergaser is constructed is sucked through AEEN ßemischkanal 11" formed in the mixing chamber 22 In · = prints which acts at the same time in the chamber 25 ₉ so that the atmospheric pressure acting in the chamber 26 closes the slide valve 12 and tends to enlarge the throttle gap 16. This changes the air _{flow 9} so that the negative pressure remains essentially constant. When the throttle valve 21 is opened, the negative pressure increases are »why the slide valve 12 is raised accordingly further _? zn to the flow of air into the mixing chamber 22 ver ~ großeraο same time, then increases the supply of fuel from the fuel nozzle 34 _β

Ea is wordea stated above spares that a certain ^h e ckströmung into the mixing chamber 22 through the play around the sides do Sehieberventils of 12 (at 36 in Pig _o 2) and through the opening 13 instead = findete This affects the Eeckströ'mung air flow through the throttle gap 16, when @ia predetermined air weight flows through the gas =, since the amount of fuel ₉ that is delivered in the air flow depends on the stroke of the slide valve 12 , arises in itself the same carburetor copies each have a different empty ¹ = running mixture «,

To achieve a uniform air flow, it is necessary; To create an adjustment for the entire air flow "ä &r" in addition to the flow through the throttle gap 16 instead of = 7

findetο To such an adjustment enable au is in the carburetor body 10 provided for connecting a channel, the mixing chamber 22 with OCE chamber 26 and a valve permits adjustment of the flow through this kanalo + Xs Figure "1 is a bore 31 ge-_ sseigtg the in Yergaserkörper 10 won the outside extends to the mixing chamber 22. "the outer Teil.der bore 51 is provided with Xnnengewinö® 38» In the inner part OCE bore 37 is a shoulder 39 © seen voi ", the outer bore 37 still has a bore 41 aufο a second bore 42 extends from the chamber 26 to gur bore 37 and intersects sviischen the shoulder 39 and the internal thread 38 _S into which a screw-threaded 43 valve needle is screwed 44 "the VentilnaäeX 44 forms with the switch 39 an adjustable Tentilquerschnitt for the of the holes 38 air duct 42 · the Yentilnadel 43/44 and formed has a slot 45 _s so that they verste of a screwdriver by means of ■ ₉ By inserting a cover disc 46 into the bore 41, the bore 37 can be closed off from the outside and sealed

Since the chamber 26 is in connection with the atmosphere, the air channel formed by the bores 37 and 42 runs parallel to the paths of the wake-up flow, so that the entire leakage flow can be changed _{by the needle needle 43 and} 44 and can be _{adjusted in all carburetor systems 9} that there is a certain flow through the throttle gap 16 "

Instead of leading the air duct 37/42 from the chamber 26 into the mixing chamber 22, this duct can be led in such a way that it emanates from another point ₉ at which atmospheric or approximately atmospheric pressure is available . The valve can be designed in another suitable manner *. Bin Madelventil is because of its Peiaein-garaging preferable ,, to eckströmung relatively large differences in the ^L offset -eu köanen, the valve needle 43/44 for a relatively long conical area _o

= 8 =

Once the valve pin 43/44 has been adjusted to compensate for different leakage flows , it is desirable that this adjustment does not need to be changed "if the flow through the throttle gap 16 has to be adjusted for other reasons" As a result, it is still useful to create a second setting option,

In Fig _o 2 is an air duct 4? shown ^ which runs in the carburetor body 10 alongside the Gemisehkanals 11 ", This air channel 47 is closed at one end and is cut at the height of this end by a transverse duct 48, which leads from the outside to the mixing chamber 22 o The outer end of the transverse duct 48 has an internal thread 49 on = the transverse channel 48 is offset and forms a shoulder 5l between its inner end and the channel 47 o Through a valve · = needle 52/53 »which forms a variable passage section with the shoulder 51, the flow through the air channel 47 / set 48 "the valve needle 52/53 is screwed into the transverse channel 48 and by a lock nut 52 in any adjusted position backed the Yentilnadol 52/53 has a relatively short ₉ slightly conical region to _e so that the adjustment range is significantly lower here ₉ as the adjustment range of the valve needle = del 43/44 «In addition, a cylindrical pin 54 is provided at the end of the valve needle 52/53 ₉ which is so long is like the screw-in thread 49 and the one with the shoulder 51 ssus & mmenarbeiteto In this way it is ensured that the passage cross-section does not exceed a predetermined maximum. By adjusting the valve needle 52/53, a small change in the flow through channel 48 and thus the entire air flow can be set without changing the setting of the valve needle 43/44 ^ u *. Such small changes can total compensation the rigidity of the machine and other characteristics _o be necessary the adjustment of the valve needle 52/53 is begrenst "that ensures that the fuel" air mixture can not be changed so that _@ in the exhaust gases, the proportion of toxic constituents grows

In the embodiment of the carburetor shown in FIG. 1, essentially atmospheric pressure _s da the chamber acts in the chamber 2β. 28 directly connected to the atmosphere istο Thus, the spool valve 12 to reach its highest position ₉ before the Leisfcuttgeinaximum the machine is reached _s auch''wenn EIA high vacuum for Onea satisfactory idle is required, it may be desirable to ₉ characterized in that on the diaphragm 24 Hubkrafi acting in the IAHE the closed position of Schieberventils'12 "low _s iat than the other Öffnenο to achieve the su _9" can be applied arrangement shown in Figure 3 _e 'Dabri the opening 28 is completed r'urch a screw plug 55 ,,

The spool valve 12 has on its ,, the throttle 21% ug @ <~ facing side of the inclined surface 56 _s through which a 'gap between the spool valve 12 and the edge of the opening 13 arises ₉ is greatest _f when the shift valve 12 check is located just above the control surface 15 and decreases " vienn the slide valve 12 is moved away from the control surface 15 _o This gap becomes a Miai = mums when the slide valve 12 reaches a middle position and remains ao ₆ until the end of the stroke _e Therefore, air can the slide valve sswischen 12 by the constant gap, the spool valve 12 and the Kant © d®r opening 13 in di © chamber 26 to enter and escape behind the slide valve 12 into the mixing chamber 22 through the begrenst®p _g veränderlichens by the inclined surface 56 gap, “Therefore the pressure in the chamber 26 will be lowest when the slide valve 12 is in the closed position. It increases during the first part of the slide valve stroke and remains in the '.'mainly constant; as soon as the inclined flat 56 through the stroke of the slide valve 12 has passed through the opening 15. 44) make adjustable ^ if this is provided in a channel connecting the chamber 26 with the atmosphere

Claims (1)

457 178 ^ -9.8.67 /) ή Arrangement for air valve carburettors for internal combustion engine © with a single-eye duct ia a housing »which is divided into © in © first chamber and into a wide chamber by a movable wall and with a slide valve connected to ά @ τ movable wall = valves öas with clearance in a ^ ffmiüg the wall ■ of the "intake = · channel slides, whereby this © opening connects the intake channel with a first chamber and the slide valve loaded with a spring forms a variable throttle gap with a control surface of the intake channel and with one between the Droasel gap and one throttle valve located in the mixing chamber _B during the first. chamber a pressure is ^ communicating with the second chamber ¹ in connection _routed? higher than the Miachkammerdrue ,, characterized in that a non § d.urdh the throttle "= gap leading air provided is _e whose passage cross section is adjustable by at least one valve _o 2ο Arrangement according to claim I ₉ characterized by valves which are specific for setting the flow rate «, An arrangement according to claim 2 ₉ characterized in that two yen = tiles are provided in two separate airways, each of which can be adjusted by one of the valves ο arrangement according to claim 2 or 5? characterized in that one of the valves ₉ © inen relatively large Sinstellbereich has and the other valve for a narrow setting range set up ο arrangement according to one of claims 2 to 4 "thereby gelcennzeieh net ₉ that- one of the valves by a seal secured lst ₈ so that it can only be moved after removal of the seal _o Arrangement according to claims 4 and 5 _9, characterized ₉ that the seal for the valve with the larger setting range provided iso 7β arrangement according to one of claims 1 to 6 ₉ characterized by the use of needle valves for. Attitude of the Boer · =? riverβ 8ο arrangement according to claim I ₆ characterized «; If the air "= away" establishes a connection between the mixing chamber of the carburetor and the first chamber and the air path lies in this airway, the adjustment valve is set to a fixed value 9 " Arrangement according to claim 8 ₉ characterized in that the bite == control valve is a needle valve ₉ whose valve needle is screwed into a bore made from the outside in the carburetor« In 1oo assembly of claim 9 ₉ characterized _s that di © outer mouth of the bore is sealed by sealing _o © iöe