DE3128562A1 - Float of a float chamber - Google Patents

Abstract

A float of a float chamber for liquid filling level control is proposed, which has a movable element inside it, which has a greater density than the float. As a result it is possible to equalise the buoyancy moment varying with the inclination and acceleration of the float chamber by subsequent parallel varying of the mass moment, thereby achieving a constant closing force on the valve.

Description

Swimmers in a swimmer chamber

The invention relates to a float of a float chamber, the arranged pivotably about a horizontally mounted bolt by means of a joint is and on the joint a device for actuating a valve for the supply a liquid.

Such float chambers come in connection with mixture formers for internal combustion engines and allow the fuel consumption by the Mixture formers without influencing the metering of the amount of fuel that is sucked in Air volume dt rh the fuel inlet pressure that occurs during pump and outlet delivery is discontinuous.

It is known that this is due to the inertia forces and the inclination of the vehicle are exposed to when driving uphill, cornering, accelerating and braking occur and lead to an inclined position of the fuel level. There are two Phases to be observed: relocation of fuel according to the occurring Mass forces and setting a new level according to the changed lift moment of the float system after a certain time. This causes errors during the Acceleration by overfilling or emptying the float chamber, which after the acceleration with a horizontal fuel level to brief overflow or lowering of the fill level, which also leads to driving errors or irregular Engine running.

To eliminate these causes of error is from DE-OS 23 63 699 a Proposal can be found in which a float with additional, above the normal buoyancy sections lying on the horizontal fuel level that gives the float system additional buoyancy when the fuel level is inclined give, whereby an increase in level should be avoided. This proposal relates on a cuboid float with the fuel level at an angle Complicated conditions can exist, which is why there is an increase in the lift torque in every inclined position, although not important as explained below, due to the shape of the float chamber can be justified.

For the application of the proposal to a frequently used roller float, in connection with a float chamber arranged symmetrically to the float no significant buoyancy force - however, the buoyancy moment changes when tilted of the mirror, no solutions have been shown, the suggestion for structural reasons due to the lift sections above the level for modern front-wheel drive vehicles, due to the space required in the overall height, not is applicable.

The invention is therefore based on the object for a modern float system (Roller float) to create a device that enables one of the inclination occurring during driving and fuel level control independent of the inertia forces to achieve, which can be implemented without additional space requirement and can be retrofitted.

The object is achieved according to the invention in that the swimmer has a center of mass whose swing radius around the pivot point of the swimmer's incline and acceleration is variable, with in its interior an element is movably arranged, which has a greater density than the float has and advantageously a pendulum or looser Rolling body is or consists of a liquid, for the latter two Executions guide tracks in the float can be formed.

With the invention is a constant in a float chamber Fuel level achievable, which is independent of the acting inertia forces and the Inclination in a vehicle.

In this way, a constant mixture quality is achieved, as a result of which a reduction in pollutants in the exhaust gas, good drivability and an economical one Operation of the vehicle is achieved.

Another advantage is the extended applicability also for extreme ones Loads such as those on off-road vehicles, construction vehicles or snow piste rollers may occur.

Embodiments of the invention are shown in the drawing and are described below.

FIG. 1 shows a conventional float system, FIG. 2 shows a system according to the invention Float system Figure 3 a variant of the embodiment according to Figure 2 Figure 4 a vertical section through the object of Figure 3 Figure 5 is a horizontal section by the subject of Figure 3.

Figure 1 of the drawing shows a conventional float system consisting from a float chamber 1, a roller float 2 with a joint 3, a bolt 4 and a valve 5 for the fuel supply, as it is for fuel level control for example, is used in a carburetor.

The float chamber 1 has a normal horizontal filling level 6 up to about the center of the circle 7 of the float 2.

This results in a closing force of the valve 5 which determines the closing force Closing moment, which is the product of the buoyancy force and the distance from the center of gravity 8 of the buoyancy volume of the swimmer from the pivot point 9 (buoyancy moment) minus the product of weight and distance of the swimmer's center of mass 10 from Joint pivot point 9 (weight moment) corresponds.

If the fuel level is inclined while driving, shown in Figure 1 by the lines 11, 12, then there are briefly no changes of the level, but for a long time because the shift of the center of gravity 8 of the buoyancy volume caused a changed closing torque due to the changed wetting of the float, as a result of which a level change occurs, with the tendency for a symmetrical one Float chamber is such that a decrease in the closing torque increases and conversely, an increase in the closing torque a reduction in the fuel level causes. Since there is an equilibrium of forces on the valve Closing force = pump pressure (of the fuel feed pump) x valve area must prevail, the compensation for the changed center of gravity L1., L2 due to different immersion depths or

The float's buoyancy is corrected, resulting in different Fill levels, which are shown by lines 13, 14, result.

In Figure 2, a float system according to the invention is shown, in which an element 15 is arranged in the float 2, which has a greater density than the float has 2 and is designed as a pendulum, roller or liquid is whose center of mass 16 at normal horizontal level 6 on the fall line of the total center of gravity 10 of the swimmer. If a Inclined position of the fuel level, as indicated by the lines 11, 12, then the same forces that cause the tilt act on the element 15, which then migrates in the guideway 18 against the slope 17, whereby the distance L3, L4 of the total center of mass 10 from the joint pivot point 9 is established, which changes the weight moment in such a way that it increases with an increase in the lift moment becomes larger and decreases with eo r decrease, so that for all inclined positions of the fuel level a constant closing torque as a result the subtraction of the lift moment - weight moment = closing moment = constant results.

Figures 3, 4 and 5 show an embodiment of the invention, the fuel level in relation to the inclination of the fuel level to the longitudinal axis of the roller float corrected, with different levels for the opposite Slopes, shown in Figure 4 by lines 19, 20, are to be achieved, the same headroom L5, L6, L7 for the fuel supply to the engine result, whereby the use of the carburetor longitudinal and transverse to the direction of travel is possible is what has not been flawlessly implemented until today. This is by one Diagonally arranged in the float guide track 21 possible, which deflects the Element 15 causes its normal position when inertia forces act.

A combination of the embodiment according to FIG. 2 and FIGS. 3, 4 and 5 is possible for special cases.

Reference number 1 float chamber 2 float 3 joint 4 bolt 5 valve 6 Level 7 Center of the circle 8 Center of gravity for buoyancy 9 Joint pivot point 10 Center of mass (weight) 11 Level lines 12 13 3 14 15 Element æ 16 Center of gravity for weight 17 Incline 18 Guide track 19 Level lines 20 21 Guide track diagonal L1 distance from the center of gravity L2 L3 Center of gravity distance L4 L5 Step height L6 L7 Blank page

Claims (6)

Claims float a float chamber, which by means of a Joint is pivotably arranged about a horizontally mounted bolt and on the joint a device for actuating a valve for the supply of a liquid has that the swimmer (2) has a Center of mass (10), whose swing radius around the pivot point (9) is variable depending on the inclination and acceleration of the swimmer (2). 2) float according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that an element (15) is movably arranged in its interior, the one has a greater density than the float. 3) float according to claim 2, d a d u r c h g e k e n n -z e i c h n e t that the element (15) is a pendulum. 4) float according to claim 2, d a d u r c h e k e n n -z e i c h n e t that the element (15) is a rolling body. 5) float according to claim 2, d a d u r c h e k e n n -z e i c h n e t that the element (15) is a liquid. 6) float according to claim 2, d a d u r c h g e k e n fl -z e i c h n e t that the element (15) is movably arranged in a guide track (18, 21) is.