Gas-dynamic pressure-wave machine

Details Gas-dynamic pressure-wave machine Gas-dynamic pressure-wave machine

2000-02-25

2001-11-13

Nguyen, Hoang (Department: 3748)

Internal-combustion engines

Charge forming device

Supercharger

C417S064000

Reexamination Certificate

active

06314951

ABSTRACT:

The present invention refers to a gas-dynamic pressure wave machine which is destined for the charge air supply of an internal combustion engine, comprising a rotor with cells, a low pressure fresh air inlet channel, a high pressure charge air channel leading to the internal combustion engine, a high pressure exhaust channel coming from the internal combustion engine, and a low pressure exhaust channel, the low pressure exhaust channel and the high pressure exhaust channel being enclosed in a gas enclosure and the low pressure fresh air inlet channel and the high pressure charge air channel being enclosed in an air enclosure. A pressure wave machine of this kind is known from the prior art, e.g. from CH-A-681 738.
Since the concept of the pressure wave machine of the prior art only allows a high efficiency in conjunction with a constant-pressure system which is as free of pulsations as possible, a volume is integrated in the exhaust manifold prior to the pressure wave machine in order to damp the motor pulsations. Without this damping action, the hard motor pulsations would enter the rotor through the exhaust channel of the gas enclosure, especially at lower motor speeds, and interfere with the proper pressure wave process of the pressure wave machine, resulting in a significant decrease in efficiency and to increased recirculation. The relatively large volume integrated in the exhaust manifold in front of the pressure wave machine is only capable of damping the pulsations partly, but not of eliminating them. Also, such an exhaust manifold volume is disadvantageous because of the larger construction volume and the higher heat capacity.
For high charging pressures and a high efficiency, standard pressure wave machines strongly depend on the filling degree. In the case of a low flow rate in the internal combustion engine, the filling degree of the rotor of the pressure wave machine will decrease and therefore also the charging pressure. In fact, in this area of the performance field, the machine is too big. In the case of a high flow rate in the internal combustion engine, the degree of filling strongly increases, and the compression efficiency deteriorates. Consequently, in this area of the performance field, the pressure wave machine is too small.
On the background of this prior art, it is the object of the present invention to provide a pressure wave machine which allows to eliminate the detrimental pulsations and to increase the compression efficiency with a reduced volume of the exhaust manifold. This object is attained by a pressure wave machine wherein a connection is provided between the high pressure charge air channel and the high pressure exhaust channel.


REFERENCES:
patent: 4702218 (1987-10-01), Yoshioka et al.
patent: 4808082 (1989-02-01), Kirchhofer et al.
patent: 4910959 (1990-03-01), Dones
patent: 5284123 (1994-02-01), Dones
patent: 681738 (1993-05-01), None
patent: 61-028717 (1986-02-01), None
patent: 97/20134 (1997-06-01), None

Affiliated with

Also associated with

Rating

Gas-dynamic pressure-wave machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gas-dynamic pressure-wave machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas-dynamic pressure-wave machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2603769