JPS59168205A - Method and apparatus for vaporizing working medium used in gas motor - Google Patents

Abstract

PURPOSE:To increase the output of a gas motor and to stabilize operation of the same, by pressurizing low-boiling point working medium, heat the working medium near to the vaporizing saturation temperature at the pressure, and vaporizing the working medium by ejecting the working medium in the state of vaporizing saturation from discharge ports formed between adjacent blades of an impeller. CONSTITUTION:Working medium is vaporized at a vaporizer 1, and after turning an impeller 7 disposed in a fluid in the vaporizer 1, it is carried to an upper condenser 2 via a tower pipe 3. The working medium liquefied at the condenser 2 is carried back to the vaporizer 1 via a circulating pipe 4. Further, a pressurizing means 6 is provided at a portion of the circulating pipe 4. Here, the vaporizer 1 is divided into a heating chamber 1a and a working chamber 1b, and a means for heating liquefied working medium 8a in the pipe 4 near to the saturation temperature at the pressure is provided in said heating chamber 1a. The pressurized working medium in the heated pipe 4 is introduced into a hollow shaft 10 and ejected to the spaces between adjacent blades 8 from discharge port 11 of the impeller 7. By thus vaporizing the working medium rapidly, it is enabled to obtain a high vaporizing pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for vaporizing a working medium in a gas motor which obtains power by rotating an impeller in a fluid using the evaporation pressure of a low boiling point working medium.

A working medium with a low boiling point such as Freon-11 is vaporized in an evaporator, the impeller in the fluid is rotated by the obtained evaporation pressure, and then this vaporized medium is liquefied in a condenser and circulated to the evaporator again. The present inventor previously developed a gas motor according to Japanese Patent Application No. 57-1.99008 as a Rankine cycle power generating device.

However, this device has the following problems because the impeller is installed in the fluid that heats the working medium, and heating and evaporation are performed in the heated fluid in the same tank. In other words, it takes a long time for the medium such as Freon to reach the vaporization temperature, and since it is gradually heated to the vaporization temperature, the evaporation is uneven and it is difficult to obtain a strong evaporation pressure. Since the vaporized medium has excessively high residual heat, it is difficult to liquefy it in the condenser.

Further, there is a problem in that moisture gets mixed into the working medium due to evaporation of the fluid surrounding the impeller, making it necessary to drain the water, and the working medium reacts with the moisture and deteriorates early.

Therefore, the object of the present invention is to simultaneously solve these problems and
An object of the present invention is to provide a method and device for vaporizing a gas morph that has a large output and operates stably.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is an evaporator with an mt impeller 7 rotatably installed in the internal fluid, 2 is a condenser that communicates with the evaporator 1 via a tower pipe 3, and 4 is the condenser 2 and evaporator 1. A tank 5 containing a low boiling point working medium such as Freon-11 and a pressurizing device 6 such as a gear pump are installed in the middle of the connected medium circulation pipe. In this way, the working medium is vaporized in the evaporator 1, and the impeller installed in the fluid is rotated by the evaporation pressure and the thrust of the fluid pushed out by it, and then guided from the tower pipe 3 to the condenser 2 above, where it is It constitutes a Rankine cycle in which the medium is liquefied and circulated again to the evaporator.

In this gas morph, the present inventors previously heated the pressurized liquefied working medium to a vaporization saturation temperature corresponding to the pressure in a heating chamber separate from the fluid tank in which the impeller was installed, and By maintaining the medium in the vaporized saturated state, the working medium is instantly vaporized by discharging it into a fluid with a pressure lower than that of the working medium, and the evaporation pressure is transferred to the fluid below the impeller. It was discovered that a powerful rotational torque can be obtained from the impeller by generating a jet stream by acting on the impeller.

For this reason, the apparatus of the present invention is equipped with a pressurizing device 6 such as a gear pump in the evaporator 4, and the evaporator 1 is connected to the heating chamber 1a and the working chamber 1b as shown in FIGS. The heating chamber 1a is provided with a heating means for heating the pressurized liquefied working medium 8a in the pipe 4 to near the vaporization saturation temperature according to the pressure, and the working chamber 1b is provided with a An impeller 7 is rotatably installed in a fluid 9 in which both the pressure medium and the bottom pressure are set, and a pipe 4 passing through the heating chamber 1a is introduced into the fluid 9 in the working chamber 1b.

In the embodiment shown, the heating chamber 1a is not a casing in which hot water is circulated as a heating means, but a pressurized liquefied working medium is circulated through the hot water, whereby the medium is heated under the pressure. It should be heated to the vaporization saturation temperature depending on the temperature.

In the illustrated example, the heating chamber 1a surrounds the outside of the working chamber 1b, and both members are integrally constructed in a connected manner, but the present invention is not limited to this, of course.

In the figure, reference numeral 12a denotes a disk-shaped plate fixed to the frame of the working chamber so as to cover the side surface of the impeller 7 with a minute interval, and is integrally connected to the cover plates 12 and 13. 14 is a reinforcing plate fixed on both sides of the blade 8, and has an opening 1 through which fluid passes.
4' is open. (5) 16 is a member 12 provided corresponding to the descending rotation range of the impeller.
It is a notch part a and functions to guide fluid between the blades 8, 8.

The working chamber lb is filled with oil or other fluid 9, and an impeller 7 is rotatably supported therein to instantaneously vaporize the working medium from the nozzle communicating with the pipe 4. The evaporation pressure is used to apply thrust to the fluid below the curved blades 8 to rotate the impeller 7. For this reason, in the illustrated embodiment, a hollow shaft 10 with one end closed in which a passage 10a such as a slit or a round hole is formed in the axial direction is installed in the center of the working chamber 1b, and the outer periphery in the axial direction is An impeller 7 having a plurality of curved blades 8 and having a discharge port 11 in the longitudinal direction of the shaft body between the blades 8° is rotatably fitted onto the fixed hollow shaft 10 via a boss 10'. , second
As shown in the figure, the rotation of the impeller 7 causes these discharge ports 11 to face and communicate with the opening 10a of the inner hollow shaft 10.

One end (6) of the hollow shaft 10 protruding to the outside of the evaporator 1 A pipe 4 passing through the heating chamber 1a is connected to the heating chamber 1a.

In addition, the cross-sectional area of the sep 4, the cross-sectional area of the inside where the hollow shaft 10 enters and the opening 10a, and the opening 1. The total cross-sectional area of the discharge port 11 of the impeller 7 that communicates with Oa is designed so that the pressure of the liquefied working medium does not drop between the pressure device 6 of the guide 4 and the discharge port 11 of the impeller 7. There is a need to. This, together with heating the medium → in the heating chamber 10 to a vaporization saturation state balanced with its pressure, is extremely important for vaporizing the medium at the discharge port 11 of the impeller 7 with the maximum evaporation pressure. .

The blades 8 of the impeller 7 are formed to have a convex axial cross section so that the thrust of the vaporized medium i injected from the discharge port 11 and the fluid 9 pushed up by the blades act most efficiently on the lower surface of the blades 8. As shown in FIG. 2, each blade has a curved surface so that its tip faces in the tangential direction of the impeller 7.

In the figure, reference numeral 12 denotes a cover plate that covers the circumference and side surfaces of the ascending rotation range A of the impeller 7 at minute intervals, and allows the evaporation pressure of the working medium inside and the thrust of the fluid 9 pushed up by this to be transferred to the impeller without wasting it. It has the function to act. Also, 13
is a cover plate installed at a small interval on the circumferential side of the descending rotation region B of the impeller 7, and has a function of reducing the resistance of fluid acting on the impeller 7.

Next, the present invention will be explained in detail.

The liquid working medium in the tank 5 descends in the tank 4,
It is pressurized by a pressurizing device 6 such as a gear pump, and heated in the heating chamber 1a to near the vaporization saturation temperature according to the pressure of the medium. For example, when using Freon-11 as a medium,
The gasification saturation point of Freon-11 under 2 atmospheres is 43℃
Therefore, when pressurizing to 2 atmospheres with a pressurizing device, heating chamber 1
At step a, the medium is heated to near 43° C. and maintained near evaporation. The pressurized medium in the pipe 4 heated to near the vaporization saturation point enters the hollow shaft 10 and passes through the opening 10a, and the impeller 7 faces and communicates with the opening 10a.
The medium is ejected from the discharge port 11 between the blades 8, 8, but when it exits from the discharge port 11, the pressure is reduced and the vaporization saturation temperature falls, so that the medium evaporates rapidly and a strong evaporation pressure is obtained. It will be done. As a result, the fluid between the blades 8 is given buoyancy and thrust by the evaporation pressure of the working medium, pushing the blades 8 upward and imparting rotational force to the impeller 7. The vaporized medium that drives the impeller is circulated from the upper central part of the working chamber up the tower pipe 3 to the condenser 2, where it is cooled by heat exchange with cooling water, guibe (not shown), etc. It is liquefied and returned to tank 5, completing the Rankine cycle.

In this way, rotational driving force is obtained from the shaft of the impeller projected outside the working chamber 10b, but in the present invention, the evaporator is divided into a heating chamber and a working chamber, and the pressurized working medium is heated. Since the chamber is heated to the vaporization saturation temperature in advance, a large evaporation pressure can be obtained at the discharge port of the impeller in the working chamber. In addition, since the fluid in the working chamber 1b does not need to be as hot as in the heating chamber, there is no risk of the medium temperature in the condenser becoming higher than necessary, and in addition, there is no possibility that fluid vapor will mix into the vaporizing medium. . Furthermore, since the range of materials that can be used as the fluid in the working chamber is widened (9), it is possible to select a fluid that can prevent deterioration of the working medium.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the configuration of an embodiment of the present invention, and Fig. 2 is a schematic diagram of the configuration of the embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view taken along the line -■ in FIG. 1. DESCRIPTION OF SYMBOLS 1... Evaporator, 1a... Heating chamber, 1b... Working chamber, 2... Condenser, 5... Tank, 6... Pressurizing device, 7... Impeller, 8 ...Blade, 9...Fluid, 10
...Hollow shaft, 11...Discharge port, 12.13...Cover plate, 14...Reinforcing side plate, 14'...Opening, 15.
...Gas vent hole, 16...Opening Applicant for utility model registration Jun Ogawa Deputy patent attorney Nao Sato
Right C10)

Claims (2)

[Claims] (1) In a gas motor that obtains rotational power by vaporizing a low-boiling point working medium and applying the evaporation pressure to an impeller, the low-boiling point working medium is pressurized until it reaches a vaporization saturation temperature corresponding to the pressure. A method for vaporizing a working medium in a gas motor, which comprises heating and injecting the liquefied medium in a vaporized saturated state from a discharge port between the blades of an impeller to vaporize it. (2) After vaporizing the low boiling point working medium in an evaporator and applying the obtained evaporation pressure to an impeller in the fluid to obtain rotational power,
In a gas motor in which the vaporized medium is liquefied in a condenser, a pressurizing device 6 is installed in the medium circulation/quiz connected to the evaporator, and the evaporator 1 is connected to a heating chamber 1a for heating the working medium. Working chamber 1 in which this heating medium is vaporized
The heating chamber 1a is divided into two parts, and the working medium is passed through the heating chamber 1a.
A rotary impeller is installed in the fluid in the working chamber 1b, and quiz 4 from the heating chamber 1a is circulated in the working chamber 1b.