JPH0527758B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides an exhaust gas suction passage provided along a roadway with a vertical slit formed around the suction passage and extending in the length direction of the suction passage. The longitudinal slits are fixed to their edges and can be closed by a pair of symmetrical elastic sealing lips in contact with each other, and are provided in a vehicle with a shuttle-shaped cross-section for exhaust gas entering the suction passage from the outside. A suction duct for exhaust gas provided along a roadway, in particular for exhaust gas in a tunnel, in which the pipe can be passed between the sealing lips in the lengthwise direction of the suction pipe, the sealing lips being temporarily widened. related to the suction passage.

[Conventional technology]

By means of the suction passage known from German Patent Application No. 31 43 236, it is possible to carry out the route from the tunnel, but also from other lines (driving sections), for example in city limits with high pedestrian traffic, at low cost in terms of investment and operating costs. Exhaust gases are removed in this manner. Such a suction passage could also be used to remove exhaust gases in assembly or production buildings. In such exhaust gas removal, the sealing lip and the transition tube with a shuttle-like cross-section acting together with it are particularly important because not only does the transition tube pass between the sealing lips at a relatively high velocity, but also ,
This is a particular problem when used in public passenger transport where, due to relatively high engine power, the transition pipe is subject to a strong temperature rise due to exhaust gases.

This exhaust gas and frictional temperature increase causes wear of the sealing lip and burns the material of the sealing lip onto the transition tube, which significantly reduces the sliding properties and further increases the frictional temperature rise.

By making the sealing lip very soft and flexible, frictional heat can be reduced. On the other hand, the sealing lip must be able to close the longitudinal slit over a relatively wide longitudinal slit against the force of gravity without any negative pressure occurring in the suction channel. In other words, if the sealing lip is made too soft, it will sag due to gravity after a long period of non-use when the exhaust gas blower is turned off. When the blower is restarted, it is not possible to build up negative pressure in the suction passage unless the sealing lip is closed. Therefore, if the sealing lip is too soft, the overall effectiveness of the suction passage becomes questionable. On the other hand, if the sealing lip is made sufficiently rigid to ensure that it can withstand gravity over the width of the longitudinal slit, even after long periods of rest and under the influence of heat, the force that spreads the sealing lip will therefore be able to withstand the force of gravity on the transition pipe passing through it. The temperature rise due to the pressing force and its frictional force becomes relatively high.

[Problem that the invention seeks to solve]

The problem of the invention is to find a workaround for this contradiction of objectives.

[Means for solving problems]

According to the first invention to solve this problem,
Elastic magnetic strips of different polarity are each embedded in the region of the mutually contacting free longitudinal edges of the sealing lip.

According to a second aspect of the invention, the sealing lip is constructed as a closed hollow profile in the contact area.

〔Effect of the invention〕

Thus, according to the first invention, elastic magnetic strips of different polarity are embedded in each free longitudinal edge of the sealing lip, so that the magnetic attraction of the magnetic strips causes
The free longitudinal edges fit tightly together to reliably close the longitudinal slit. Because the free longitudinal edges are in close contact with each other, the sealing lips can be made relatively narrow and thin to increase flexibility, yet the free longitudinal edges open up from each other due to sagging due to gravity. Nor.

Further, according to the second invention, since the sealing lip pieces are configured as closed hollow profiles, they are pressed against each other and come into close contact with each other due to the slight gas pressure existing therein, thereby reliably closing the vertical slit. However, it will not open due to sagging due to gravity. By suitably selecting the wall thickness of the hollow profile, it is also possible to obtain the desired flexibility of the sealing lip.

〔Example〕

The invention will be explained below on the basis of different embodiments shown in the drawings.

In FIG. 1, the roadway 1 defining the track has lateral guide projections 3 which cooperate with the lateral guide rollers 4 of the vehicle 2 to define a precise trajectory course for the vehicle. For example, a suction channel 7 is suspended in the ceiling area of the tunnel and is connected at several points to a suction blower (not shown).

In order to guide exhaust gas from a vehicle 2 driven by an internal combustion engine to a suction passage 7, an exhaust pipe 5 of the vehicle is led through the interior space of the vehicle up to the roof. The exhaust pipe then opens into a swingable funnel piece 19, on the upper side of which a transition pipe 12 of shuttle-shaped cross section is mounted. Swing axis 6 of funnel piece 19 and transition pipe 12
is located in the longitudinal direction of the vehicle and approximately in the range of the end of the exhaust pipe 5 in terms of height. Since the transition pipe is swingable, it is possible to compensate for lateral movements of the vehicle body in the area of the suction passage.

The suction passage 7 has on its underside a vertical slit 8 extending over the entire length of the suction passage. This longitudinal slot 8 is closed by symmetrically arranged elastic sealing lips, which close together at their tips. Individual drawings are of sealing lip piece 9,1
0 and 11 different embodiments are shown.

In the embodiment shown in FIGS. 1 to 3, the sealing lip 9 is constructed as a thin, single-layer sealing lip. Even though the sealing lip hangs relatively steeply downward in the closed state in the attached position, a relatively large force of gravity acts on the sealing lip 9, pulling the two sealing lips in contact with each other. I try to let go. Nevertheless, even if there is no negative pressure in the suction passage 7,
In order to be able to keep the sealing lip closed against the action of gravity, elastic magnetic strips 14 and 14 of different polarity are provided in the region of the mutually contacting free longitudinal edges 13 of the sealing lip 9. ' are embedded in each. These magnetic strips keep the two free longitudinal edges 13 magnetically close to one another. Thereby, the sealing lip can be formed to be relatively easy to bend, so that the frictional force of the shuttle-shaped transition tube 12 sliding therebetween can be made very small. By forming the transition tube from a non-magnetic material, such as stainless steel or ceramic, the contact force of the longitudinal edge 13 on the transition tube 12 is not increased, despite the embedding of the magnetic strip.

For assembly reasons, the root region 16 of the sealing lip has a large cross-section, and in addition an insert slit is formed in the sealing lip, through which the sealing lip can be sucked out onto the free plate edge delimiting the longitudinal slit 8 of the channel. It can be attached to. Despite this increased wall thickness of the sealing lip in the root region 16,
In order to make the sealing lip soft and flexible, a longitudinally extending notch 17 is provided in the thickened root region, the bottom of this notch being carefully rounded to avoid a notch effect. A kind of membrane hinge is thereby formed in the root region. The incision is deliberately provided on the inside of the sealing lip and is particularly narrow so that the inner wall portions forming the sides of the incision serve as stops 18 against inwardly directed pulling of the sealing lip. can. If the negative pressure inside the suction channel is particularly high, there is a risk that the very soft sealing lip will be sucked inward. This risk is also exacerbated, inter alia, by the fact that the transition tube slides obliquely to one side between the two sealing lips, with one sealing lip being bent strongly downwards and the opposite The sealing lips extend at a relatively gentle slope toward one of the sealing lips. Such tensioning of the sealing lip is shown in dashed and dashed lines on the right sealing lip in FIGS. 2 and 7. A stop 18 in the root region of the sealing lip prevents the sealing lip from being pulled completely inward. That is, the sealing lip has greater stiffness against inward bending than against expansion of the sealing lip. Note that this idea is also realized in the sealing lip according to FIGS. 6 and 7.

In addition, the modified embodiments of the sealing lip according to FIGS. 4 to 7 show another solution principle for realizing a sealing lip that is stable in shape but has low friction.
Here, closed hollow profiles 15 and 15' are provided in the contact area of the sealing lips 10 and 11. In the embodiment shown in FIGS. 4 and 5, the sealing lip 10 has a circular hollow profile in the unloaded state (FIG. 4), which in the installed state is D-shaped at the contact point. It is flattened. As the transition tube 12 slides between the two sealing lips, the flattened section becomes wider and the hollow profile is flattened into a more D-shape. However, the hollow profile offers relatively little resistance to this compression, so that the frictional forces are relatively small. Note that since the friction is distributed over a relatively large area, a large wear volume is freed on one side of the sealing lip. Locally, the maximum pressing force is in the transition range from the flat part to the rounded part of the hollow profile, but the location of this transition changes during the spreading or reapproximation of the sealing lip, so that
During passage through the transition tube, different wall sections are always stressed. Owing to the statically advantageous circular shape of the hollow profile, the hollow profile can span a relatively wide longitudinal slot 8 in a stable shape without the risk of shrinkage due to gravity, even in a relatively thin-walled configuration. It should be noted that the wall thickness of the hollow profile 15 can be simply made so thin relative to the diameter of the hollow profile that there is actually a risk that the hollow profile will shrink due to gravity. Nevertheless, the use of thin-walled hollow profiles in this way is advantageous. This is because, when negative pressure is generated in the suction passage 7, by temporarily applying positive pressure inside the hollow profile, the hollow profile can be expanded to its initial circular shape. Thereby, the vertical slit 8 can be forcibly closed and a negative pressure can be created inside the suction passage 7. When such negative pressure is generated, the positive pressure inside the hollow profiled member 15 is cut off,
At least it can be reduced. because,
This is because the negative pressure in the suction passage 7 can hold the hollow profile in the lifted closed position against gravity.

In the embodiment of the sealing lip 11 shown in FIGS. 6 and 7, the hollow profile 15' has a lenticular cross-section in the unloaded state (FIG. 6), and its substantially linearly extending outer wall 20 It has a thin inner wall 21 that curves convexly toward the opposite sealing lip.

Despite a certain degree of bending stiffness of the sealing lips in the area of the outer wall 20, both sealing lips contact relatively soft and flexible at their inner wall 21.
If, after the suction pressure is cut off, the sealing lip sag slightly downward due to gravity and the vertical slit cannot be closed any longer, the inner wall 21 is convexed inwardly by similarly supplying positive pressure to the hollow profiled member 15'. The vertical slit can be closed again by curving it. When the suction pressure is again established in the suction passage 7, the suction passage keeps the sealing lip closed so that the supplied positive pressure can be removed again. The transition tube can then slide between the two sealing lips 11 with very little frictional force.

[Brief explanation of the drawing]

Figure 1 is a longitudinal view of a roadway that has a suction passage above the vehicle and defines the track for the vehicle;
The figure is a perspective view of the cut section of the suction passage according to FIG.
3 is a perspective view of a section of the sealing lip of the suction channel according to FIGS. 1 and 2; FIG. 4 is a sectional view of another embodiment of the sealing lip with a circular hollow profile; FIG.
4, FIG. 6 is a cross-sectional view of the embodiment of the sealing lip with a hollow profile of lenticular cross-section, and FIG. FIG. 7 is a perspective view of the cut portion of the pair of sealing lips of FIG. 6 in the installed state; 1...roadway, 2...vehicle, 7...suction passage,
8... Vertical slit, 9, 10, 11... Sealing lip piece, 12... Transition tube, 13... Vertical edge, 14, 1
4'... Magnet strip, 15, 15'... Hollow profiled material.

Claims (1)

[Scope of Claims] 1. An exhaust gas suction passage provided along the roadway has a vertical slit formed around the suction passage and extending in the length direction of the suction passage, and the vertical slit is provided at each edge of the suction passage. A transition pipe for exhaust gas with a shuttle-shaped cross-section, which can be closed by a pair of fixed and symmetrical elastic sealing lips in contact with each other and which enters the suction passage from the outside in the vehicle, passes between the sealing lips into the suction pipe. In the case where the sealing lip 9 can be passed through in the longitudinal direction and the sealing lip is temporarily widened, elastic magnetic strips 1 of different polarity are placed in the region of the mutually contacting free longitudinal edges 13 of the sealing lip 9.
4 and 14' are embedded in each of the exhaust gas suction passages provided along the roadway. 2. The wall thickness of the sealing lip 9 increases gradually towards the root region 16, and the sealing lip 9 has an incision 17 extending longitudinally inside the root region 16 and forming a kind of hinge; 2. A suction drawer according to claim 1, characterized in that the wall section is rounded off at its bottom and that the wall portions forming the sides of the incisions 17 serve as stops 18 for inwardly directed pulling of the sealing lip 9. aisle. 3. An exhaust gas suction passage provided along the roadway has a vertical slit formed around the suction passage and extending in the length direction of the suction passage, and the vertical slits are respectively fixed to the edges and in contact with each other. A transition pipe for exhaust gas, which is closable by a pair of symmetrical elastic sealing lips and has a shuttle-shaped cross section and enters the suction passage from the outside of the vehicle, passes between the sealing lips in the length direction of the suction pipe. In the case where the sealing lips 10, 11 are configured as hollow profiles 15, 15' which are closed in the contact area, the sealing lips 10, 11 are constructed as closed hollow profiles 15, 15'. Exhaust gas suction passage provided along the line. 4. The hollow profile 15 has an approximately circular cross-section in the unloaded state, and in the installed state of the sealing piece, this cross-section is flattened into a D-shape at the contact point. The suction passage according to item 3. 5. The hollow profile 15' is characterized in that, in the unloaded state, it has a lenticular cross-section with an outer wall 20 that extends approximately linearly and an inner wall 21 that curves convexly towards the opposite sealing lip; A suction passage according to claim 3. 6 an incision 17 in which the wall thickness of the sealing lip 11 gradually increases towards the root region 16 and in which the sealing lip 11 extends longitudinally inside the root region 16 and forms a kind of hinge;
, this notch 17 is rounded at its bottom, and the wall portions forming the sides of the notch 17 are connected to the sealing lip 1
Claim 3, characterized in that it serves as a stop 18 for an inwardly directed pull of 1.
Suction passage as described in section.