JPS6357601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-water two-phase fluid supply device for a positive displacement expansion engine. For example, it relates to an expansion machine that converts the thermal energy of a two-phase fluid of steam and hot water, such as a mixture of steam and water ejected from a geothermal well, thermal wastewater from a factory, heated water heated by solar heat, into mechanical energy. A rotary expansion machine in which an expansion chamber is formed by the envelope sliding surfaces of different types of rotors that rotate at different speeds around fixed rotation center lines, and one rotor is enclosed within the other rotor. It is. Such a device is disclosed in Japanese Patent Application Laid-Open No. 56-34902 entitled "Rotary Expansion Machine." The gist of the invention described in this publication is that in a rotating expansion chamber in which an inner rotor whose outline is a trochoidal curve and an outer rotor whose outline is an outer envelope thereof are eccentrically rotated in a vehicle interior, the inner rotor The opening of the external rotor and the air supply port of the vehicle compartment are configured to coincide with each other at a position where the volume between the contour of the outer rotor and the inner contour of the outer rotor is minimum, and the air supply from the opening is expanded. This is characterized by exhausting the air after the air has cooled down.
With this configuration, when gas-liquid mixed steam is intermittently supplied through one pipe, water accumulates in the blocked part while the rotor closes the supply port, and when gas-liquid is supplied from the supply port, water is not supplied. The water film at the mouth and outlet causes a pressure loss and the pressure in the expansion chamber cannot rise sufficiently, resulting in a loss of work.The present invention aims to solve this problem.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be explained below with reference to figures. The external rotor 2 that rotates inside the vehicle compartment 1 and the internal rotor 3 that is enveloped inside the external rotor 2 rotate eccentrically, and both rotation center lines are fixed, and while the external rotor 2 rotates three times, The internal rotor 3 rotates four times. The present invention separates a gas-liquid two-phase fluid of steam and hot water into steam and hot water by a separation tank 8, and supplies the steam from a steam supply port 4,
Hot water is supplied from a hot water supply port 6 behind the steam supply port 4 in the rotational direction of the rotor. In this case, the distance between the steam supply port 4 and the hot water supply port 6 is related to the opening length S of the expansion chamber 5, and at least the distance between the rear end of the steam supply port 4 and the hot water supply port 6 in the rotation direction of the rotor. The distance from the front end is made smaller than the opening length S. That is, the spacing is such that the hot water supply port 6 comes to the opening S of the expansion chamber until the opening S of the expansion chamber passes through the steam supply port 4. 7 is an exhaust hole. Note that the separation tank 8 is a normal type, which separates steam and hot water from the steam-water two-phase flow, and supplies the steam to the steam supply port 4.
Second, the hot water is guided to the hot water supply port 8.

Next, the operation of the present invention will be described. Steam supplied from the supply port 4 is supplied to the expansion chamber 5 formed between the inner and outer rotors when the volume thereof is at its minimum, and the steam expands as both rotors rotate. Since the hot water and steam are separated and fed at the same pressure, when the supplied hot water expands, the steam expands to some extent, and the pressure in the expansion chamber 5 becomes slightly lower, making it easier for the hot water to expand. ing. Furthermore, when hot water is supplied, the hot water supply port 6 and the steam supply port 4 are communicated through the expansion chamber 5, so that no loss due to a sudden drop in pressure occurs.
In the P-V diagram shown in Fig. 2, the vertical axis P shows the pressure in the expansion chamber 5, and the horizontal axis V shows the volumetric stroke, where a is the top dead center, b is the air supply end point, and c is the bottom dead center. This is the position where the expansion chamber 5 opens into the exhaust hole 7. In contrast to the theoretical acupressure diagram α in FIG. 2, there is no hot water supply port 6,
In the conventional system in which a two-phase flow is fed in a mixed state from the supply port 4, the state is as shown in the diagram β, but according to the present invention, by separating steam and hot water and feeding them, the pressure is The diagram is improved to the diagram γ. As can be seen from this figure, the pressure between β and γ rays is improved by p.

As explained above, an expansion chamber is formed by the envelope-related sliding surfaces of different types of rotors that rotate at different speeds around their respective fixed rotation center lines, and one rotor is enclosed within the other rotor. In a positive displacement expansion engine, the air and water to be supplied are separated in advance to form steam and hot water, and the hot water is supplied at intervals between the respective supply ports until the opening of the expansion chamber passes through the steam supply port. Since the steam and hot water are fed so that the mouth is located at the opening of the expansion chamber, the steam supply port is not blocked by a film of water, unlike when two phases of steam and water are fed through a single pipe. There is no concern about pressure loss during the expansion process in the expansion chamber, and the pressure in the expansion chamber increases compared to systems that supply only separated steam or systems that simultaneously supply a two-phase flow of steam and water. , the amount of work due to expansion increases as shown in the closed area of the γ-ray diagram in FIG.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a positive displacement expansion engine for explaining the present invention, and FIG. 2 is a PV diagram. 1... Vehicle compartment, 2... External rotor, 3... Internal rotor, 4... Steam supply port, 5... Expansion chamber, 6
... Hot water supply port, 7 ... Exhaust hole, 8 ... Separation tank.

Claims (1)

[Claims] 1. A positive displacement expansion engine in which an expansion chamber is formed by the envelope sliding surfaces of different types of rotors that rotate at different speeds around fixed rotation center lines, and one rotor is enclosed within the other rotor. The rotor has a steam supply port and a hot water supply port connected to a separation tank that separates a steam and water two-phase fluid into steam and hot water. An air/water two-phase fluid supply device for a positive displacement expansion engine, characterized in that the distance from the leading edge is smaller than the opening length of the expansion chamber.