Rotating fluid machine
Inactive Publication Date: 2005-02-03
HONDA MOTOR CO LTD
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Benefits of technology
[0009] In the configuration described above, the rotating fluid machine functions as an expander which integratingly supplies mechanical energy generated by each of first and second energy converting means, and functions as a compressor which integratingly supplies pressure energy of the gaseous phase working medium generated by each of the first and second energy converting means, and the gaseous phase working medium having leaked out of the energy converting means of the higher pressure is fed to the energy converting means of the lower pressure via a one-way valve. Therefore, the gaseous phase working medium having leaked out of the higher pressure energy converting means can be effectively utilized by the energy converting means of the lower pressure to enhance the efficiency of energy conversion, instead of being discarded wastefully. Moreover, when the pressure of the gaseous phase working medium having leaked out of the higher pressure energy converting means is lower than that of the gaseous phase working medium in the lower pressure energy converting means, the one-way valve can obstruct the gaseous phase working medium from flowing back, thereby preventing the efficiency of the lower pressure energy converting means from deteriorating.
[0011] In the configuration described above, as the first and second energy converting means consecutively operate in succession on a common gaseous phase working medium, not only can the feed and discharge routes for the gaseous phase working medium be simplified but also can the efficiency of generating mechanical energy or pressure energy be enhanced.
[0013] In the configuration described above, as the first energy converting means comprises cylinders radially formed in a rotor rotatably accommodated in a rotor chamber and pistons sliding within these cylinders, it is possible to minimize the efficiency drop due to leakage by enhancing the sealing performance of the high pressure gaseous phase working medium. Also, as the second energy converting means comprises vanes supported by the rotor to move in the radial direction, their outer circumferential faces being in sliding contact with the inner circumferential face of the rotor chamber, the structure of the mechanism to convert pressure energy and mechanical energy is simple, making it possible to process a large quantity of gaseous phase working medium in spite of the compactness of the structure. This combination of the first energy converting means having pistons and cylinders and the second energy converting means having vanes makes it possible to obtain a high performance rotating fluid machine having the features of the both.
Problems solved by technology
Moreover, when the pressure of the gaseous phase working medium having leaked out of the higher pressure energy converting means is lower than that of the gaseous phase working medium in the lower pressure energy converting means, the one-way valve can obstruct the gaseous phase working medium from flowing back, thereby preventing the efficiency of the lower pressure energy converting means from deteriorating.
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[0028] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
[0029] As shown in FIG. 1, a waste heat recovery device 2 for recovering the thermal energy of exhaust gas of an internal combustion engine 1 and outputting mechanical energy has an evaporator 3 for generating high temperature high pressure steam by heating water with heat derived from the exhaust gas of the internal combustion engine 1, an expander 4 for outputting axial torque with the expansion of the high temperature high pressure steam, a condenser 5 for cooling and liquefying reduced temperature reduced pressure steam discharged from that expander 4, a tank 6 for storing the water discharged from the condenser 5, and a low pressure pump 7 and a high pressure pump 8 for supplying water in the tank 6 to the evaporator 3 again.
[0030] The water in the tank 6 is pressurized to 2 to 3 MPa by the low pressure pump 7 arranged on a passage P1, and preheated as it...
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A rotating fluid machine has first energy converting means including cylinders and pistons, and second energy converting means including vanes emerging from and submerging into a rotor in the radial direction. A gaseous phase working medium having leaked out of the higher pressure first energy converting means to a reservoir is effectively utilized instead of being discarded wastefully by feeding the leaked gaseous phase working medium to the lower pressure second energy converting means via a one-way valve and a junction chamber. Moreover, when the pressure in the reservoir is lower than that in the junction chamber, the one-way valve obstructs the gaseous phase working medium from flowing back, thereby preventing the efficiency of the second energy converting means from deteriorating.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a rotating fluid machine capable of functioning as an expander or a compressor by converting the pressure energy of a gaseous phase working medium into the rotational energy of a rotor and vice versa. [0003] 2. Description of the Related Art [0004] Japanese Patent Laid-Open No. 2001-336491 discloses a rotating fluid machine provided with first energy converting means composed of cylinders and pistons and second energy converting means composed of vanes wherein these first and second energy converting means convert the pressure energy of a gaseous phase working medium into mechanical energy to rotate a rotor and vice versa. [0005] This rotating fluid machine includes a reservoir formed in the inner circumferential part of the rotor, in which a high pressure gaseous phase working medium having leaked out of the cylinders resides, a junction chamber formed between the first and second e...
Claims
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Login to View More IPC IPC(8): F01B21/04F01C1/344F01K23/06F01C11/00F01C19/00F01C19/02F01C21/08F01K23/10
CPCF01C1/3446F01C11/006F01C21/0836F01C19/02F01C19/005
InventorICHIKAWA, HIROSHITAKAHASHI, TSUTOMUKIMURA, YASUNARIENDOH, TSUNEO
OwnerHONDA MOTOR CO LTD