Wankel pump cycle residual boost system

Abstract

A cycle residual boost and two release cavities are provided on a cylinder wall. Wankel cycle air pump is provided with additional cavities which allow the pressure output higher than its fixed compression ratio and further increase compression efficiency. An apex seal active tracking mechanism is also provided. Wankel cycle air pump rotor plates passage makes apex seals keep firmly contact against a cylinder.

Claims

1. A Wankel pump cycle residual boost system, comprising a plurality of cycle pump cavities on a cylinder wall wherein in a first group of the cycle pump cavities, a cycle residual boost to a next compression stroke is provided; and in a second group of the cycle pump cavities, a second release to an incoming intake stroke is provided.

2. The Wankel pump cycle residual boost system of claim 1, further comprising an apex seal active tracking mechanism including a low pressure passage on tips of rotor plates which allow apex seals to always stay in between of high pressure in a seal bottom chamber and a low pressure in a crank case; and a pressure difference between the high pressure and the low pressure forces seal wedges to push the apex seals to firmly contact the cylinder wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 schematically depicts a Wankel cycle air compressor of the invention;

[0018] FIG. 2 is a timing chart of compressor operations at crank angles −9, 0, 9, 18, and 27 degrees;

[0019] FIG. 3 is a perspective view showing positions of cavities in a cylinder; and

[0020] FIG. 4 is an exploded view showing a configuration of a main rotor.

DETAILED DESCRIPTION OF THE INVENTION

[0021] Referring to FIGS. 1 to 4, a Wankel cycle air compressor in accordance with the invention is shown. Operations of the Wakel cycle air compressor are discussed below.

[0022] A cylinder 3 has a cylinder wall 9. A main rotor 15 rotates inside the cylinder 3 and separates the cylinder 3 into a first chamber 10, a second chamber 11 and a third chamber 12. Each of the chambers 10, 11 and 12 increase and decrease volume according to a crank shaft angle. The first chamber 10 having an increased volume chamber sucks air while an intake port 8 is open. In the meantime, the second and third chambers 11 and 12 having a decreased volume pump air through an outlet port 7. The first, second and third chambers 10, 11 and 12 alternatively execute sucking and pumping while a crank shaft is rotating.

[0023] As shown in FIG. 2 specifically, it is a timing chart of compression operations at crank angles −9, 0, 9, 18, and 27 degrees.

[0024] In detail, FIG. 2 shows the operation of TDC −9 degrees. Compression stroke of the second chamber 11 comes to an end. At this angle, volume reaches a minimum and no more air can be pumped out.

[0025] At TDC 0 degree, residual air escapes to the second chamber 12 for compression through a boost cavity 1 which further increases pressure of the second chamber 12 for compression.

[0026] At TDC 9 degrees, the boost cavity 1 is going to close and a second release cavity 2 is going to open.

[0027] At TDC 18 degrees, air having a lower pressure is released to the first chamber 10 through the second release cavity 2.

[0028] At TDC 27 degrees, the second release cavity 2 is going to close.

[0029] As shown in FIG. 3 specifically, it shows the cavities 1 and 2 in the cylinder 3.

[0030] Referring to FIG. 4, it shows two rotor plates 5 each at outside of a rotor side ring 13 and a rotor corner seal 14. A passage 6 to crank case is provided on a tip of the rotor plate 5 so that a terminal end of an apex seal 4 keeps at a crank case pressure. Pressure of an apex seal bottom chamber 16 is relatively high. The pressure difference pushes two apex seal wedges 17 against the cylinder 3 at any rotor angles.

[0031] While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.