JPS608081Y2 - Structure of the internal compartment of the rotary expander - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a rotary expander that expands fluid such as geothermal water that mixes liquid and high-pressure steam. This relates to the structure of the internal compartment that is intended to accommodate the

(Prior art) As an expander that converts thermal energy of a two-phase fluid such as geothermal water, which is a mixture of liquid and high-pressure steam, into mechanical energy, for example, JP-A No. 54-67149 r'' two-phase rotary expansion is used. There is a machine.

The gist is that an outer child having a columnar space whose cross-sectional contour is a trochoid curve or an outer envelope of a trochoid curve; If the line is a line and the contour of the outer child is the outer envelope of a trochoidal curve, it has an inner child of the columnar body that is a trochoidal curve, and the outer child and the inner child contact at two or more points of the contour curve. The outer element is configured to rotate around the center of the cylindrical inner surface of the casing, and the inner element rotates a certain distance with an axis parallel to the axis of rotation of the outer element. The structure is configured to be rotatably supported around a fixed axis, and utilizes the fact that the cross-sectional area of the portion surrounded by the circumferential curve of both sides changes with the relative rotational movement. This is a two-phase rotary expander that converts thermal energy into mechanical energy by introducing and expanding a phase fluid.

FIG. 1 is a cross-sectional view of a rotary expander to which this prior art is applied, and FIG. 2 is a horizontal cross-sectional view thereof.

This is a rotary expander that utilizes a 3-node 4-node trochoid curve, in which the rotation center axis R of the inner rotor 1 and the rotation center axis ■ of the outer rotor 2 are eccentrically arranged in parallel lines, and the inner circumference of the outer rotor 2 Four points are inscribed in the internal rotor 1 and rotate,
The outer circumference of the outer rotor 2 is configured to rotate the cylindrical inner surface of the inner chamber 3 at a constant rotation ratio.
This is a rotating machine that expands fluid containing high-pressure steam by utilizing changes in the space formed by the machine, and extracts energy as a prime mover.

The inner surface of the rotating outer rotor 2 constitutes a surface forming the outer envelope of the cross-sectional curve of the inner rotor 1.

The outer surface of the outer rotor 2 has a cylindrical shape, is inscribed in the inner chamber 3, and is configured to rotate around the rotation center axis (2).

4 is a casing. The inner rotor 1 is supported by a shaft and rotates around a rotational center axis R, and the rotor portion of the outer rotor 2 rotates around a rotational center axis (2) with respect to the inner casing 3.

To explain the operation of this rotary expander, if the fluid supply port 5 for the fluid containing high-pressure steam is placed above the rotation centers R and 2 of both rotors 1 and 2, the force caused by the expansion of the fluid and the axial center can be adjusted. As a result, both rotors rotate clockwise at a constant rate, increasing the volume of the space sealed between the inner rotor 1, outer rotor 2, and inner casing 3, and then discharging the fluid as a prime mover. It converts energy into rotation.

(Problems to be solved by the invention) In converting thermal energy into mechanical energy using a high-pressure gas-liquid two-phase flow, the invention may change the proportion of gas and liquid supplied even at the same pressure. When recovering energy using the same engine, the energy recovery efficiency is affected by the expansion process of the supply air (the supply of gas and liquid is simply referred to as supply air).

In other words, if the charge air expansion process is made shorter than the optimum process, the pressure at the exhaust end point will rise under the same engine conditions, resulting in underexpansion, and conversely, if the charge air expansion process is long, overexpansion will occur.
In either case, energy loss increases.

(Means for Solving the Problem) The present invention has been devised in view of the above, and includes an internal chamber interposed within a casing, an external rotor that rotates along the inner circumference of the internal chamber, and an external rotor that rotates along the inner circumference of the internal chamber. In a rotary expander that utilizes the trochoidal curve and its envelope line, which consists of an internal rotor that rotates at a constant ratio around an axis that is inscribed in the axial center of the external rotor and is eccentric to the axis of the external rotor, the exhaust opening end of the internal casing is The internal chamber of the rotary expander is equipped with a removable end piece that substantially becomes a part of the internal chamber.

The present invention has a removable end piece so that the opening end of the interior compartment 3 near the exhaust port of the interior compartment 3 can be placed in any position between position A and position B in FIG. 7 is provided, and the piece 7 is as shown in FIG.

The shape of the piece 7 is such that the extension and end portions of the internal compartment 3 are formed in a dogleg shape, and the length of the piece is arbitrary.

The length of the piece is selected and attached according to the temperature and pressure of the gas used.

(Function) Next, the function of the present invention will be described. Let V be the volume of gas-liquid hot water supplied from the fluid supply port 5.

, where the volume after expansion is Vl, Vl/VO is the expansion ratio.

At the same pressure, when there is a large amount of gas-liquid hot water, the expansion ratio is large, and when there is little liquid, the expansion ratio is small.

If the P-V diagram of the expansion chamber formed by the external rotor 2 and the internal rotor 1 is drawn, it will be as shown in Fig. 4, and if the supply air expansion process is short, it will be at point a, and if it is long, it will be at point b. Become.

At point a, there is insufficient expansion, so there is a margin in the pressure after expansion, and energy is not recovered sufficiently, and at point a, there is overexpansion, and the pressure in the expansion chamber becomes negative, increasing energy loss.

Since the present invention is a rotary expander in which the expansion coefficient of gas-liquid hot water to be supplied changes, the casing is extended to position B (Fig. 1) by the long end piece 7 for supply air with a large expansion coefficient. The expansion process of the supply air is lengthened, and conversely, for supply air whose expansion rate is smaller than the standard, a short end piece is used to make the casing up to position A, and the expansion process of the supply air is shortened, and the condition of the exhaust at the exhaust port is improved. By always keeping the exhaust pressure in the standard state, the exhaust pressure can be maintained at just the right level, so the supply air can be expanded without wastage and energy recovery efficiency can be maximized.

(Effects) As is clear from the above explanation, when expanding gas-liquid hot water such as geothermal water, which has a large variation in expansion ratio, and converting it into energy, the internal car is effectively attached to the exhaust side end of the internal car. Since it is configured to be equipped with a removable end piece that becomes part of the chamber, the fluid can be rotated and expanded in the optimal state each time depending on the pressure of the fluid containing pressure steam and the properties of the fluid.
This has the effect that the scope of application as a rotary expander is expanded, and rotary expanders with different conditions can be obtained with the same design.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the rotary expander, Fig. 2 is a horizontal sectional view, Fig. 3 is a perspective view of the end piece of the internal chamber to explain the present invention, and Fig. 4 is a P- It is a V diagram. DESCRIPTION OF SYMBOLS 1... Internal rotor, 2... External rotor, 3... Curved interior compartment, 4... Casing, 5...
...Fluid supply port, 6...Exhaust port, 7...
...End piece.

Claims (1)

[Scope of utility model registration request] An internal casing is interposed within the casing, and an external rotor rotates along the inner circumference of the internal casing, and a fixed ratio centering on an axis inscribed in the external rotor and eccentric to the axis of the external rotor. In a rotary expander that utilizes a trochoidal curve and its envelope formed by an internal rotor that rotates, the exhaust opening end of the internal casing is equipped with a removable end piece that becomes substantially a part of the internal casing. The internal compartment of a rotary expander.