JP2861427B2 - Expander - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary expander used in an energy conversion device or the like.

[0002]

2. Description of the Related Art FIG. 6 shows a basic structure of a rotary rotor type expander.
8 to FIG. This type of expander has a trochoid shape 2
Two parallel to the closed loop surface consisting of two circumferential parts
1 having a hollow portion 141 having two side surfaces
10, a shaft 120 supported by the housing and passing through the hollow portion 141, a rotation center 121 of the shaft 120
Rotor 130 having a rotation center 131 eccentric with respect to the center of the housing 1 on the side of the housing 110
2 pair of gas supply ports 11 provided symmetrically with respect to 21
1a, 111b, gas outlets 112a, 112b, and three gas communication holes 131a, 131b, 131c provided in the rotor axisymmetrically with respect to the center 131 of the rotor 130.
Is provided.

[0003] Referring to the state shown in FIG.
A state in which the exhaust stroke is about to enter the expansion stroke
The expansion chamber C preceding the expansion chamber A is in direct communication with the gas discharge port 112b in the exhaust stroke, and the expansion chamber B following the expansion chamber A is in communication with the gas supply port 111b and the gas discharge port 112b in the expansion stroke. It has not been done. In such a state, when the rotor 130 is stationary,
Even if high-pressure gas is supplied to the gas supply ports 111a and 111b, no high-pressure gas is supplied to any of the expansion chambers.
There is a problem that the expander does not start operation. In the state of FIG. 7 in which the rotor is slightly rotated from this state, the expansion chamber A has already reached the gas supply port 1 through the gas communication hole 131a.
11a communicates with the gas supply port 11
Simultaneously with the supply to 1a, the high-pressure gas is supplied to the expansion chamber A, and the expander starts operating. However, rotor 13
8, the expansion chamber A is in the expansion stroke, but the communication with the gas supply port 111a has already been completed, and the expansion chambers B and C are either directly or with the gas communication port 131C. Through the gas outlets 112a and 112b, there is a problem that the high-pressure gas is not supplied to any of the expansion chambers again at the time of startup, and the expander does not start operating.

In order to solve the problem at the time of starting, US Pat. No. 3,825,375 discloses that a gas supply port provided in a housing side plate is constituted by two openings of a starter port and a main port. A valve that opens and closes by centrifugal force is arranged in one of the gas communication holes of the rotor that communicates with the port. In this example, since the start-up valve is open, it is possible to communicate the starter port to the working chamber, but to provide a starter port in the housing side plate, and to provide a passage in the rotor to the starter port, Furthermore, it is necessary to provide a valve that opens and closes by centrifugal force in this passage, and there has been a problem that the configuration is complicated.

[0005]

The problem to be solved by the present invention is to ensure that high-pressure gas is always supplied to an expansion chamber at the time of starting and during an expansion step, and to simplify the structure of the expander. Is to make it a technical issue.

[0006]

The technical means taken to solve the above-mentioned problem is that the expansion chamber and the gas communication hole are not connected to the gas supply port in a rotation region where the gas communication hole is not in communication with the gas supply port. In other words, a passage that communicates with the gas supply port is provided in the rotor.

[0007]

According to the above technical means, any one of the expansion chambers in the expansion stroke is always in communication with the gas supply port. Even if the rotor stops at a position where no gas is supplied, high-pressure gas is supplied from the gas supply port, so that the expander can be easily started the next time the expander is operated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, a housing 10, a rotor 3
0 is basically the same as the prior art. That is, a shaft 20 is supported at the center of a housing 10 having a trochoid-shaped closed loop surface composed of two circumferential portions and two parallel side surfaces, a triangular rotor 30 is disposed in the housing 10, and a vertex is provided. The shaft 20 is supported to move along the closed loop surface. Rotor 3 at corner vertex
An apex seal 33 is provided to isolate the chambers 41, 42, 43 formed by the housing 0 and the housing 10.

On the side surface of the housing 10, two pairs of gas supply ports 11a and 11b and gas discharge ports 12a and 12b are provided symmetrically with respect to the center. The rotor 30 is provided with three communication holes 31a, 31b, and 31c that communicate from the side surface to the outer peripheral surface so as to be axially symmetric with respect to the center. The rotor 30 further includes grooves 32a, 32b, 3 at shoulders formed by the side surfaces and the outer peripheral surface.
2c is provided. In FIG. 1, this groove merely faces the chambers 41 and 42 during the exhaust-intake stage (grooves 32a and 32c) and has no effect. The hole 31b is the gas supply port 11
b, the gas supply port 11b is cut into the groove 32.
It will be connected with expansion chamber 43 via b. Therefore, when the expander is started, high-pressure gas is supplied to the chamber 43 from the gas supply port through the groove 32b, and the chamber 43 is brought into a high-pressure state, so that the rotation can be easily started. When the rotor rotates and the expansion chamber 41 communicates with the gas supply port 11a via the gas communication port 31a, the groove 32b is connected to the gas supply port 11b.
This eliminates the need for a valve mechanism to prevent excessive gas flow.

FIGS. 4 and 5 show another embodiment.
The hole 32 'provided in 1' is provided so as to communicate from the side surface to the outer peripheral surface, avoiding a corner formed by the side surface and the outer peripheral surface.

[0011]

As described above, since the gas communication holes of any of the expansion chambers in the expansion stroke are provided in the rotor in the rotation region not communicating with the gas supply port, the passage connecting the expansion chamber and the gas supply port is provided in the rotor. At the time of startup, high-pressure gas is always supplied to one of the expansion chambers in the expansion stroke, and a reliable startup is performed.
Does not require a starter port on the housing side plate,
A specific effect that the valve mechanism in the rotor passage can be eliminated can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of an expander according to the present invention.

FIG. 2 is a single view of a piston (rotor) in FIG. 1;

FIG. 3 is a view taken in the direction of arrow III in FIG. 2;

FIG. 4 is another embodiment of the piston (rotor) according to the present invention.

FIG. 5 is a view taken in the direction of the arrow V in FIG. 4;

FIG. 6 is a front view of a conventional expander.

FIG. 7 is a view showing a state accompanying the movement of the piston of FIG. 6;

FIG. 8 is a view showing a state accompanying the movement of the piston of FIG. 6;

[Explanation of symbols]

 ... Housing, 11a, 11b... Gas supply port, 12a, 12b... Gas outlet, 30... Piston (rotor), 31a, 31b, 31c. ... gas communication holes, 32a, 32b, 32c, 32 '... passages.

Claims (3)

(57) [Claims] 1. A housing having a hollow portion comprising a closed loop surface comprising two trochoid-shaped circumferential portions and two parallel side surfaces, a shaft supported by the housing and passing through the hollow portion, A triangular rotor supported by an eccentric portion of a shaft and disposed in the hollow portion;
Two pairs of gas supply ports and gas discharge ports provided on the side surface of the housing, three gas communication holes provided in the rotor, and all three expansion chambers formed by the rotor in a hollow portion of the housing. However, in a rotor rotation region that does not communicate with the gas supply port via the gas communication hole, a passage provided in the rotor to communicate the gas supply port with the expansion chamber in the expansion process of the expansion chamber. Having expander. 2. The expander according to claim 1, wherein the passage is a groove opened to a side surface and an outer peripheral surface of the rotor. 3. The expander according to claim 1, wherein the passage comprises a hole opening from the side surface of the rotor to the outer peripheral surface.