DE20217307U1 - Compensating tank for internal combustion engine's cooling system has vent pipe installed inside it and conically widens in direction of coolant, and outlet of vent pipe ends just above partition installed parallel to coolant surface - Google Patents

Abstract

The compensating tank for an internal combustion engine's cooling system has a vent pipe (2) installed inside it and conically widens in the direction of the coolant (9). The outlet (10) of the vent pipe ends just above a partition (4) installed parallel to the coolant surface, and a passage (11) for coolant is formed between the inner wall of the tank and the partition. The partition is installed below a minimum filling amount of the liquid in the compensating tank.

Description

The invention relates to an expansion tank for a cooling system a liquid-cooled internal combustion engine with the features mentioned in the preamble of claim 1.

In the cooling system of a liquid-cooled internal combustion engine is an expansion tank for Volume compensation in the cooling system located coolant arranged. The expansion tank is on its upstream side with a common vent line connected to the one from the radiator and one from the coolant jacket leading the internal combustion engine Vent line opens. Both vent lines can also separate into the expansion tank. Via a located at the bottom of the expansion tank filling line is the expansion tank via a cooling water pump with the cooler and above with the coolant jacket connected to the internal combustion engine.

In the via the vent line returned coolant there are air bubbles that in the in the expansion tank located coolant reach. Moreover takes place through the inflow of the returned coolant in the with coolant filled surge tank a lather the coolant, which leads to the formation of tiny air bubbles. A foamed coolant supplied to the cooler reduces the cooling capacity of the entire cooling system essential. To improve air separation or to reduce the Inclusion of air in coolants are different solutions regarding one in a cooling system an internal combustion engine arranged reservoir.

Is known by the US 4,677,943 a cooling system for an internal combustion engine, in which the ventilation line leading vertically from above into the expansion tank for separating comparatively large air bubbles has an extension piece extending into the region of the bottom of the expansion tank.

With this solution can not be prevented be that air bubbles with the coolant on the am Reservoirs ground located filling line to the cooler reach.

From the DE 40 35 284 A1 is a surge tank for the coolant of liquid-cooled internal combustion engines, in which the vent line leading to the bottom of the surge tank above the liquid level is provided with a ventilation hole for additional enrichment of the water-air mixture with air. Enrichment with air is intended to support the formation of large air bubbles, which can then rise better to the water surface. The expansion tank is also divided into several chambers by vertically arranged foam fabric inserts. The liquid-flowing foam fabric inserts are intended to further improve the degree of air separation.

The disadvantage here is that Impurities in the coolant the flow properties of the coolant through the foam fabric inserts can be negatively influenced. Also needs this solution a high structural effort.

Furthermore, from the DE 40 25 067 C1 A vent line leading into a surge tank for the coolant is known, which opens horizontally below the surge tank ceiling in the surge tank. The ventilation line opens via a right-angled pipe element into a line that runs vertically up to the vicinity of the tank bottom. The part of the ventilation line that runs vertically to below the surface of the coolant is designed as a calming space, the cross-section of which is larger than the part of the ventilation line that opens into the expansion tank.

The object of the invention is a generic expansion tank such train that foaming of the coolant in the expansion tank reduced and entry of air into the from the expansion tank to cooler leading filling line is largely avoided.

This object is achieved in a generic expansion tank according to the invention characteristic features of the protection claim 1 solved.

By training one towards coolant flaring vent line, the a short distance above a partition arranged parallel to the coolant surface below the minimum fill level the one in the expansion tank located coolant ends, the flow velocity is achieved within the expanding vent line is reduced. As a result, foaming of the in the expansion tank located coolant is reduced. The arrangement of the partition separates the coolant inside the expansion tank in an area above the partition in which the cooling liquid is partially frothed and in an area below the partition, in which the coolant calms and defoams is. The air separation from the coolant takes place in the above the coolant located in the partition.

Because the passage of the coolant from the upper to the lower area of the expansion tank is arranged in the edge area of the expansion tank, only reassured coolant can reach the lower area of the expansion tank and thus into the filling line leading to the cooler. Air bubbles in the coolant located below the partition are thus largely avoided. As a result, no air bubbles can get into the cooler and thus into the cooling system via the filling line. The cool system can work with a higher efficiency because the efficiency-reducing air pockets in the coolant leading to the cooler are largely excluded.

Another advantage of the solution according to the invention is in that a refill of the expansion tank quickly and easily with coolant can be done. Due to the arrangement of the partition plate filling swirling and foaming the coolant largely avoided in the area below the separating plate, so that even after a refill an entry of air bubbles into the filling line is prevented. Furthermore, no "empty suction" of the container has occurred even at high speeds, because with this design there is always enough cooling water in the filling line flow back can.

Further advantageous configurations are in the subclaims They are described in the description along with their effects explained.

Based on a drawing, a embodiment described the invention. In the accompanying drawing is schematic an expansion tank according to the invention in Section shown.

In the upper area of the expansion tank 1 is a closable filler neck 5 for refilling the expansion tank 1 with coolant 9 arranged. At the bottom of the expansion tank 1 there is a connection piece 3 , which is connected via a filling line known per se to a cooler, not shown, of a liquid-cooled internal combustion engine.

A vent line coming from the cooler is installed before entering the expansion tank 1 connected to a ventilation line coming from the coolant jacket of the internal combustion engine. The common vent line 2 opens into the expansion tank in the upper area 1 , The outer walls of the expansion tank 1 are with level markings 6 and 7 provided the the maximum permissible level 6 and the minimum allowable level 7 the one in the expansion tank 1 located coolant 9 Show.

According to the invention is within the expansion tank 1 arranged ventilation line 2 towards the coolant 9 conically expanding. As a result, the flow rate of the coolant returned from the cooler and from the coolant jacket of the internal combustion engine, and thus the rate at which it enters the expansion tank 1 reduced. The exit opening 10 the vent line 2 ends at a short distance above a partition arranged parallel to the coolant surface 4 , The partition 4 is inside the expansion tank 1 below the minimum fill level 7 the one in the expansion tank 1 located coolant 9 arranged. This ensures that even with a minimal fill level 7 the exit opening 10 the vent line 2 below the surface of the in the expansion tank 1 located coolant 9 located.

By in the expansion tank 1 arranged partition 4 will be in the expansion tank 1 located coolant 9 separated into a partially foamed area with air bubbles and a calming area. The partially foamed area of the coolant 9 is located above the partition 4 , which also includes air separation from the coolant 9 he follows. The calmed area of the coolant 9 is located below the partition 4 in which the connecting piece 3 is arranged for the filling line.

The partition 4 is over a base 8th at the bottom of the expansion tank 1 attached and so in the expansion tank 1 arranged that between the inner wall of the expansion tank 1 and the partition 4 a passage 11 for the coolant 9 is formed.

To achieve an already calm zone in the edge area of the expansion tank 1 in which the culvert 11 is the vent line 2 to the vertical central axis of the expansion tank 1 arranged inclined. As a result, it hits the vent line 2 recirculated coolant 9 almost in the center of the partition 4 on and can until the edge of the expansion tank is reached 1 the air from the coolant 9 deposit.

The solution according to the invention firstly causes the coolant to foam in the expansion tank 1 reduced and on the other hand, an entry of air into the from the expansion tank 1 Fill line leading to the cooler largely avoided.

List of the reference numerals used

1

surge tank

2

vent line

3

spigot

4

partition wall

5

filler pipe

6

maximum level mark

7

minimum level mark

8th

base

9

coolant

10

outlet opening

11

passage

Claims (5)

Expansion tank for a cooling system of a liquid-cooled internal combustion engine with the following type: - A connecting piece arranged in the lower region of the expansion tank, which is connected via a Lei device is connected to a cooler, - a vent line opening into the expansion tank in the upper area, the outlet opening of which lies below the surface of the coolant, - the part of the vent line that runs vertically to below the coolant surface is designed as a calming space, the cross-section of which is larger than that in part of the vent line opening into the expansion tank, - a filler neck arranged in the upper region of the expansion tank for refilling coolant, characterized in that the inside of the expansion tank ( 1 ) arranged ventilation line ( 2 ) towards coolant ( 9 ) is designed to expand conically, the outlet opening ( 10 ) at a short distance above a partition arranged parallel to the coolant surface ( 4 ) ends, and that between the inner wall of the expansion tank ( 1 ) and the partition ( 4 ) a passage ( 11 ) for the coolant ( 9 ) is formed. Expansion tank according to claim 1, characterized in that the partition ( 4 ) below a minimum fill level ( 7 ) in the expansion tank ( 1 ) coolant ( 9 ) is arranged. Expansion tank according to claim 1 and 2, characterized in that the conical vent line ( 2 ) to the vertical central axis of the expansion tank ( 1 ) is inclined. Expansion tank according to claim 1 to 3, characterized in that the partition ( 4 ) over a base ( 8th ) at the bottom of the expansion tank ( 1 ) is attached. Expansion tank according to claim 1 to 4, characterized in that the outlet opening ( 10 ) the vent line ( 1 ) below the minimum fill level ( 7 ) in the expansion tank ( 1 ) coolant ( 9 ) is arranged.