JPS6357604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device on both sides of an expansion chamber formed between the inner and outer rotors of a positive displacement expansion engine. The positive displacement expansion engine that is the subject of this application utilizes thermal energy possessed by two-phase fluids of steam and hot water, such as air-water mixtures gushing out from geothermal wells, thermal wastewater from factories, heated water heated by solar heat, etc. As shown in FIG. 1, the expansion machine converts mechanical energy into mechanical energy. As shown in FIG. Both sides of the expansion chamber formed between the inner rotor and the inner surface of the outer rotor, which is formed by a curved surface in an enveloping relationship, are sealed by seal pieces attached to the edge of the rotor. It is described in 1988-60802 "Rotating Fluid Machinery". This is because an expansion rotating chamber is formed by the envelope sliding surfaces of rotors with different axes rotating at different speeds around their respective fixed rotation center lines, and one rotor is integrated with the other rotor in a side casing. On the other hand, it is a rotary fluid machine in which side seals are provided to connect opposing parts of adjacent apex regions. The present invention relates to the side seal, and the present invention can reliably improve the sealing effect.

Hereinafter, the present invention will be explained based on examples. Figure 2 is a perspective view of a positive displacement expansion engine with some parts missing.
This figure shows a sealed state in which the expansion chamber 5 is sealed by the seal piece 6 both in the rotational direction and in the axial direction. FIG. 3 shows a longitudinal section along the axis of the rotor section, and seal water is sent to a water supply channel 7 built into the rotor through a water supply pipe 9 provided on the rotating shaft 8. The water supply channel 7 is connected to a water supply channel 7' provided near the periphery of the rotor in parallel to the rotating shaft, and presses a built-in piston 10 at both ends of the water supply channel 7'. A seal piece 6 is connected to the piston 10. Reference numeral 11 is a relief valve for venting air from the water supply channel 7'.

Next, to explain the operation of the present invention, when the rotor 3 is not rotating, the seal at the end of the expansion chamber is sealed only by the pressing force of the spring applied to the seal piece, but as the rotor 3 rotates, the water supply channel 7 Water pressure is generated in the seal water inside by centrifugal force and presses the piston 10, so the piston 10 pushes out the seal piece 6 to ensure the sealing condition. The amount of protrusion of the seal piece 6 can be designed to be about 3 mm when the rotational speed of the rotor 3 is 1000 to 1500 rpm.

As can be seen from the above description, the present invention forms the inner side of the outer rotor that rotates in a cylindrical vehicle interior with a curved surface that is in an enveloping relationship with the inner rotor whose outline is a trochoid curve, and a curved surface is formed between the inner and outer rotors. A seal piece is formed on the edge of the rotor to seal both sides of the expansion chamber, and a piston connected to the seal piece and a seal water supply channel that presses the back surface of the piston are built into the inner rotor. The water supply pipe provided on the rotating shaft of the rotor is connected to the water supply channel, and the centrifugal force of the seal water acts on the piston connected to the seal piece, so the seal in the expansion chamber increases the rotational speed of the rotor. As the engine speeds up, it becomes more reliable and has the effect of making the engine extremely efficient at high speeds.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a positive displacement expansion engine to which the present invention is applied, FIG. 2 is a partial perspective view with the same part cut out, and FIG.
The figure is a sectional view along the axis of the rotor portion. 1... Vehicle compartment, 2... External rotor, 3... Internal rotor, 4... Air supply port, 5... Expansion chamber, 6...
Seal piece, 7, 7'... Water supply channel, 8... Shaft, 9...
... Water supply pipe, 10 ... Piston, 11 ... Relief valve.

Claims (1)

[Claims] 1 The inside of the external rotor rotating in a cylindrical vehicle interior is formed with a curved surface that is in an enveloping relationship with the internal rotor and has a trochoid curve as an outline, and a seal piece is provided to seal both sides of the expansion chamber formed between the inner and outer rotors. In the rotor formed on the edge of the rotor, a piston connected to the seal piece and a seal water supply channel that presses the back surface of the piston are built into the internal rotor, and a water supply pipe provided on the rotating shaft of the internal rotor and the A side seal device for a positive displacement expansion engine, which is connected to a water supply channel so that the centrifugal force of the seal water acts on a piston connected to a seal piece.