JPS61210201A - Screw-type engine - Google Patents

Abstract

PURPOSE:To enable the kind of fluid to be differentiated depending upon the position of use, whether in an expansion engine part or in a compressor part, by providing a fluidic machinery, which is used to introduce a gas to be worked into a rotor working chamber, to a rotar shaft and moreover making a part of a working chamber formed with a pair of rotors function as an expansion engine. CONSTITUTION:High pressure steam 28 is introduced from a steam inlet 22 into a working chamber 9 via a port 25 and is expanded in the working chamber 9 in order to rotate both a male and female rotors 14 and 15. The high pressure steam 28 is discharged from a steam outlet 23 when the working chamber 9 is connected to the steam outlet 23. In addition, when rotors 14 and 15 rotate until the working chamber 9 is connected to the port 25, intake air 29, which was pressed up by a scavenging blower 21, is introduced into the working chamber 9 so that the steam 28 remaining in the working chamber is replaced with the air 29. When the rotation of the rotors 14 and 15 advance further, both steam outlet 23 and port 26 are closed, and the air in the working chamber 9 is compressed. Then, this compressed air is discharged from an air discharge opening 24.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a screw type engine, and particularly to a screw type engine suitable for simultaneously generating power and changing the state of the actuated gas in one engine. It concerns the structure of the institution.

[Background of the invention]

Conventionally, the system for this type of screw engine was to install an expander and a compressor separately and connect them directly with a coupling, as disclosed in Japanese Patent Publication No. 32-8384. In this system, one pair of three rotors is used as an expander, and the other pair of rotors is used as a compressor. However, these systems do not take into consideration the fact that a pair of rotors has the functions of both an expander and a compressor.

[Purpose of the invention]

The object of the present invention is to provide an integrated male rotor with the functions of both an expander and a compressor. It is about providing institutions.

[Summary of the invention]

The present invention is characterized in that a third fluid machine is provided on the rotor shaft to guide the actuated gas into the rotor working chamber, and that a part of the working chamber formed by the pair of rotors, that is, the rotor rotates. Another advantage is that the area where the volume increases functions as an expander.

In this way, it becomes possible to compress the fluid to be pumped into the region that operates as an expander and the fluid to be compressed that is of a different type.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a screw steam expander/air compressor &

Screw steam expander/screw casing 10 that houses the male and female rotors,
A blower casing 11 fixed to one end of the screw casing, a nine end cover 12 fixed to the opposite side thereof, and a seventj8 casing 13 fixed to the blower casing.
Consisting of The male rotor is inside the screw casing lo.
14, the female rotor 15 is housed so as to fit into each other with a small gap, and forms the working chamber 9 with the sb screw casing 1o. These rotors 14°15
is supported by roller bearings 16 provided in the S casing 13 and the screw casing 10, and these rotors 14
, 15 are restrained from moving in the axial direction by ball bearings 17. 1 provided between the rotor shaft and screw casing 10
8 prevents leakage of high pressure gas inside the casing, and
This is a seal that prevents oil supply from the bearings 16 and 17 from penetrating into the screw casing 10. Rotor 14°15
A rounded male timing gear 19 and a female timing gear 20 that mesh with the rounded male timing gear 19 are attached to the shaft end to interlock both rotors and rotate these rotors without contact. Further, a scavenging blower 21 is attached to the shaft of the male rotor 14 on the side opposite to the timing gear 19 so as to be housed within the blower racing 11.

A steam port 22, a steam outlet 23, and an aeration port 24 are opened in the screw casing 10.

A steam inlet port 25 communicating with a steam port 22 is formed in the blower casing 11, and an air inlet port 26 is formed on the opposite side thereof for guiding the discharge air of the scavenging blower 21 to the working chamber 9 of the rotor 14.15. . Further, the S casing 13 is provided with an air passage 27 communicating with the suction port 21-1 of the scavenging blower 21. Note that the discharge pressure of the scavenging blower 21 is set to be somewhat higher than the pressure of the steam outlet 23.

Figure 3-1 shows the working chambers 9 of the male and female rotors and each opening 23,
24, 25, and 26 are developed at the rotor meshing portion, and the → mark in [Yes] indicates the rotation direction of the rotor. The positional relationship between the steam outlet 23 and the air inlet port 26 is such that the working chamber 9, which moves as the male and female rotors rotate, first communicates with the steam outlet 23, and after a short delay, communicates with the air inlet port 26. .

The operating principle of this steam expander/air compressor engine will be explained below with reference to FIG. 4.

1. The high-pressure steam 28 flowing in from the steam population 22 is guided to the working chamber 9 via the steam inlet port 25 (Figure 4-1). 2. The high-pressure steam 28 in the working chamber 9 expands, and the pressure of the steam increases. The thermal energy is converted into mechanical work and the male and female rotors 14 and 15 are rotated. (4th λ) The expansion progresses further and the rotors are rotated. When the working chamber 9 communicates with the steam outlet 23, the high pressure steam 28 is The steam is then discharged from the steam outlet 23. (Figure 4-3) Next, as the rotation progresses to the east and the working chamber 9 communicates with the air inlet boat, the steam is discharged by the scavenging blower 21 attached to the male rotor shaft. The suction air 29 whose pressure has been increased flows into the working chamber 9 and replaces the steam 28 remaining in the working chamber 9.
Figure 4) S, 'g! When the rotation progresses to , the steam outlet 23,
The air inlet boat 26 is closed and the air in the working chamber 9 begins to be compressed. (No. 4-5) 6. When the compression progresses further and the working chamber 9 communicates with the air outlet 24, the compressed air is discharged through the air outlet 24. (4th
(Figure 6) The above explanation focused on only one working chamber, but in reality, the above 1. ~6. 9. Since the strokes are performed simultaneously and continuously in all working chambers, the power generated by the high-pressure steam enables multiple continuous compressions of the suction air.

As explained above, according to the embodiment of the present invention, a pair of male,
Since it is possible to have the female rotor function as both an expander and a compressor, the overall size of the machine can be reduced, the structure can be simplified, maintenance can be simplified, and costs can be reduced.

The thrust direction force and the radial direction force that act on the male and female rotors during continuous operation are caused by the pressure of the working gas (steam in the example) and the actuated gas (air in the example) being balanced, so the roller bearings 16, balls The bearing 17 can be made smaller than when the expander and compressor are each used individually.

〔Effect of the invention〕

As described above, according to the present invention, different types of fluids can be used in the expander section and the pressure m rear section simply by combining a pair of rotors and a fluid machine.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the screw steam expander/air compressor engine, Figure 2 is a sectional view taken along line II in Figure 1, and Figure 3-1 shows the working chambers of the male and female rotors and their respective openings. Developed at the rotor meshing part, Figure 9, Figure 3-2 is a cross-sectional view taken along the line ■-■ in Figure 3-1, Figure 3-3 is a cross-sectional view taken along line m--■ in Figure 3-1, and Figure 4-1. - Figures 4-6 are explanatory diagrams of the operating principle of the screw steam expander/air compression engine. 9... Working chamber, 10... Screw casing, 1
1... Blower casing, 12... End cover,
13...S casing, 14...male rotor, 15...
...Female rotor, 16...Roller bearing, 17...Ball bearing, 18...Seal, 19...Male timing gear, 2
0... Female timing gear, 21... Air blower,
22...Steam inlet, 23...Steam outlet, 24...
Air outlet, 25... Steam inlet boat, 26... Air inlet boat, 27... Air inlet ¥13-1 Figure ¥: J 3-2 Kuchia 3-3. t 4-1 Figure

Claims (1)

[Claims] A pair of male and female rotors that mesh with each other is housed in a casing, and high-pressure working gas is introduced into the working chamber formed by the meshing of the male and female rotors, and the expansion and attraction of the high-pressure working gas is converted into rotational motion of the rotor. In a screw type engine, a casing housing the male and female rotors is provided with an inlet for high-pressure working gas and an inlet for actuated gas on one end face of the rotor, and a discharge port for high-pressure working gas on the other end face of the rotor. and a screw type engine, characterized in that a fluid machine is provided with a discharge port for actuated gas, and further includes a fluid machine that guides the actuated gas to the inlet for the actuated gas, and is attached to the rotor shaft.