JP2011196305A - Reciprocating steam engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating steam engine with simple structure, operated by low-pressure steam.SOLUTION: An engine body part 2 includes: first and second body cylinders 21A, 21B; first and second body pistons 22A, 22B; a piston rod 23; and first and second body intake/exhaust ports 24A, 24B. A motion conversion part 4 includes: a first engagement part 41 attached to the piston rod 23; and a second engagement part 42 eccentrically attached to an output rotational shaft 8 and engaged with the first engagement part 41. A motion control part 6 alternately achieves a first control state in which intake to the first body cylinder 21A and the exhaust from the second body cylinder 21B are performed at the same time and a second control state in which intake to the second body cylinder 21B and exhaust from the first body cylinder 21A are performed at the same time, based on action of first and second rotary valve members 73M, 73N rotated together with the output rotational shaft 8, in an intake/exhaust distribution switching mechanism mounted to the output rotational shaft 8.

Description

  The present invention relates to a reciprocating steam engine, and more particularly to a reciprocating steam engine characterized by a control mechanism for supplying and discharging steam.

  In recent years, effective use of energy resources has been screamed, and attempts have been widely made to obtain renewable energy using waste heat obtained from various heat generating parts.

  For example, a boiler is operated using waste heat generated by a propulsion engine in a ship. Steam obtained from this waste heat boiler is supplied as a heat source to, for example, each part in the ship. Conventionally, this steam has a pressure of about 0.5 MPa, for example.

  On the other hand, a conventional steam engine uses high-quality steam having a relatively high pressure (for example, about 10 MPa) generated by a dedicated generator. For this reason, although a large output is possible, the structure is complicated and the size is large. Therefore, it is difficult to reduce the cost of the apparatus.

  A first object of the present invention is to provide a reciprocating steam engine having a simple structure in view of the above technical problems. A second object of the present invention is to provide a reciprocating steam engine capable of operating with steam at a relatively low pressure as obtained from a waste heat boiler or the like.

According to the present invention, the object as described above is achieved.
An engine body for generating reciprocating motion of the piston in the cylinder by the action of steam; a motion converting portion for converting reciprocating motion of the piston of the engine body into rotational motion of the output rotating shaft; and A reciprocating steam engine comprising an operation control unit that controls supply and discharge of the steam to and from the cylinder according to a rotation phase;
The engine main body includes a first main body cylinder and a second main body cylinder arranged so as to face each other, and a first main body piston and a second main body piston respectively accommodated in the first main body cylinder and the second main body cylinder, A piston rod connecting the first main body piston and the second main body piston to each other, a first main body intake / exhaust port attached to the first main body cylinder, and a second main body intake / exhaust attached to the second main body cylinder. Having a mouth,
The motion converter is attached to the piston rod and extends in a direction crossing the reciprocating direction; the motion converter is attached to the output rotating shaft and is eccentrically positioned from the output rotating shaft; A second engagement portion that is engaged with the first engagement portion so as to be relatively movable in a direction in which the first engagement portion extends.
The operation control unit includes an intake / exhaust distribution switching mechanism attached to the output rotation shaft so as to allow rotation of the output rotation shaft,
The intake / exhaust distribution switching mechanism includes a central member, a first chamber located on one side of the central member and a second chamber located on the other side with respect to the direction of the rotational center of the output rotational shaft, and the output rotational shaft. A first rotary valve member and a second rotary valve member respectively housed in the first chamber and the second chamber so as to rotate together with
The central member includes an external intake port, an external exhaust port, a first internal intake port and a first internal exhaust port that open to the one side, a second internal intake port and a second internal exhaust port that open to the other side, An intake passage for communicating the external intake port with the first internal intake port and the second internal intake port, and an exhaust passage for communicating the external exhaust port with the first internal exhaust port and the second internal exhaust port. With
The first internal intake port and the first internal exhaust port are spaced apart from each other by a first distance from the rotation center of the output rotation shaft and are located on opposite sides with respect to the rotation center of the output rotation shaft, and the second internal intake port And the second internal exhaust port is separated from the rotation center of the output rotation shaft by a second distance and is located on the opposite side with respect to the rotation center of the output rotation shaft,
The first rotary valve member is in contact with the surface on the one side of the central member and is circumferentially around the rotation center of the output rotation shaft at a position separated from the rotation center of the output rotation shaft by the first distance. Has a first communication slot extending in an arc shape,
The second rotary valve member is in contact with the surface of the other side of the central member, and in a circumferential direction around the rotation center of the output rotation shaft at a position separated from the rotation center of the output rotation shaft by the second distance. Has a second communication slot extending in an arc shape,
The first chamber is provided with a first distribution intake / exhaust port, the first distribution intake / exhaust port is connected to the first main body intake / exhaust port of the engine main body, and the second chamber has a second distribution intake / exhaust port. 2 distribution intake / exhaust ports are provided, and the second distribution intake / exhaust ports are connected to the second main body intake / exhaust ports of the engine main body,
The intake / exhaust distribution switching mechanism causes the first internal intake port and the first chamber to communicate with each other through the first communication long hole and the second communication long hole through the rotation of the output rotation shaft. A first control state in which intake to the first main body cylinder and exhaust from the second main body cylinder are simultaneously performed based on the communication between the second internal exhaust port and the second chamber; Based on the communication between the first internal exhaust port and the first chamber through a communication long hole, and the communication between the second internal intake port and the second chamber through the second communication long hole, Alternately realizing a second control state in which exhaust from the first main body cylinder and intake to the second main body cylinder are simultaneously performed;
Reciprocating steam engine, characterized by
Is provided.

  In one aspect of the present invention, the first rotary valve member is biased toward one surface of the central member, and the second rotary valve member is directed toward the other surface of the central member. It is energized. In one aspect of the present invention, the one side surface of the central member and the surface of the first rotary valve member that contacts the one side surface, and the other side surface and the other side surface of the central member The surfaces of the second rotary valve member that are in contact with each other are orthogonal to the rotation center of the output rotation shaft. In one aspect of the invention, the external inlet is connected to a working steam supply source.

  According to the present invention, a reciprocating steam engine having a very simple structure is provided, and a reciprocating steam engine capable of operating with relatively low-pressure steam obtained from a waste heat boiler or the like is provided. Efficient use of energy resources at a price becomes easier.

1 is a schematic perspective view showing an embodiment of a reciprocating steam engine according to the present invention. FIG. 2 is a schematic exploded perspective view of the embodiment of FIG. 1. It is a typical longitudinal cross-sectional view of embodiment of FIG. It is a typical longitudinal cross-sectional view of embodiment of FIG. It is a typical exploded perspective view showing a motion conversion part of other embodiments of a reciprocating type steam engine by the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view showing an embodiment of a reciprocating steam engine according to the present invention, FIG. 2 is a schematic exploded perspective view of this embodiment, and FIGS. 3 and 4 are schematic views of this embodiment. FIG.

  The reciprocating steam engine according to this embodiment includes an engine main body 2 that generates a reciprocating motion of a piston in a cylinder by the action of working steam, and a reciprocating motion of the piston of the engine main body 2 that rotates an output rotating shaft 8. A motion conversion unit 4 that converts the motion into motion is provided, and an operation control unit 6 that controls the supply and discharge of the steam to the cylinder in accordance with the rotational phase of the output rotation shaft.

  The engine body 2 includes a first main body 21A and a second main body cylinder 21B in the horizontal direction, and a first main body movably accommodated in the first main body cylinder 21A and the second main body cylinder 21B. The piston 22A and the second main body piston 22B, the horizontal piston rod 23 that connects (couples) the first main body piston 22A and the second main body piston 22B to each other, and the first portion attached to the head portion of the first main body cylinder 21A. It has a main body intake / exhaust port 24A and a second main body intake / exhaust port 24B attached to the head portion of the second main body cylinder 21B. The first main body cylinder 21A and the second main body cylinder 21B are fixed to the opposite sides of the base member 26 in the horizontal direction, and are coaxially so as to face each other at a predetermined distance in the horizontal direction. Aligned.

  The motion conversion unit 4 is attached to the piston rod 23, and extends in a direction (vertical direction) across the direction (horizontal direction) of the reciprocating motion of the first main body piston 22A and the second main body piston 22B. Furthermore, it is attached to the output rotation shaft 8 and is eccentrically located from the output rotation shaft 8 (that is, has a center shifted from the rotation center 8X of the output rotation shaft 8) and is attached to the first engagement portion 41. On the other hand, it has the 2nd engaging part 42 engaged so that relative movement is possible in the extension direction (up-down direction). The first engaging portion 41 is formed of a long hole, and the second engaging portion 42 is inserted into the long hole so as to be relatively reciprocally movable. The second engaging portion 42 is composed of a bearing attached to a protrusion 82 attached to a disk-like member 81 attached to the end of the output rotating shaft 8. The second engaging portion 42 cannot move relative to the first engaging portion 41 in the horizontal direction perpendicular to the direction of the output rotation shaft rotation center 8X, and the extending direction (long) of the first engaging portion 41 is not possible. Relative movement is possible in the longitudinal direction of the hole, that is, in the vertical direction.

  The operation control unit 6 includes an intake / exhaust distribution switching mechanism attached to the output rotary shaft 8 so as to allow the output rotary shaft 8 to rotate. The intake / exhaust distribution switching mechanism includes the first chamber 72M and the other side (in FIG. 2, the left side in FIG. 2) of the central member 71 and the direction of the output rotation shaft rotation center 8X. The first rotary valve member 73M and the second rotary valve member 73N respectively housed in the first chamber 72M and the second chamber 72N so as to rotate together with the output rotation shaft 8 and the second chamber 72N located on the right back side). And.

  The central member 71 includes an external intake port 711 and an external exhaust port 712 attached to the outer periphery, a first internal intake port 713M and a first internal exhaust port 714M that open to one side (left front side in FIG. 2), and the other side (see FIG. 2, the second internal intake port 713N and the second internal exhaust port 714N that open to the right back side), the external intake port 711, the intake passage 715 that communicates with the first internal intake port 713M and the second internal intake port 713N, and In addition, an exhaust passage 716 is provided for communicating the external exhaust port 712 with the first internal exhaust port 714M and the second internal exhaust port 714N.

  The first internal intake port 713M and the first internal exhaust port 714M are separated from the output rotation shaft rotation center 8X by the first distance D1, and are located on the opposite sides with respect to the output rotation shaft rotation center 8X. The second internal intake port 713N and the second internal exhaust port 714N are separated from the output rotation shaft rotation center 8X by the second distance D2, and are located on the opposite sides with respect to the output rotation shaft rotation center 8X. The first distance D1 and the second distance D2 are preferably the same.

  One side (left front side in FIG. 2) and the other side (right back side in FIG. 2) of the central member 71 are orthogonal to the output rotation shaft rotation center 8X.

  The first rotary valve member 73M has a disk-like outer shape, and both surfaces thereof are orthogonal to the output rotation shaft rotation center 8X. One side of the first rotary valve member 73M is in contact with one side (left front side in FIG. 2) of the central member 71 so as to be slidable. Here, the first rotary valve member 73M is attached to the output rotation shaft 8 by a sliding key connection, and can be relatively reciprocated in the direction of the rotation center 8X, but around the rotation center 8X. Relative rotation is prevented. Further, the first rotary valve member 73M is directed toward the surface on one side (the left front side in FIG. 2) of the central member 71 by the first coil spring 74M wound around the output rotation shaft 8 in the first chamber 72M. It is energized. The first rotary valve member 73M has a first communication long hole 731M extending in an arc shape in the circumferential direction around the output rotation shaft rotation center 8X at a position separated from the output rotation shaft rotation center 8X by the first distance D1.

  Similarly, the second rotary valve member 73N has a disk-like outer shape, and both surfaces thereof are orthogonal to the output rotation shaft rotation center 8X. One side of the second rotary valve member 73N is in contact with the other side (right rear side in FIG. 2) of the central member 71 so as to be slidable. Here, the second rotary valve member 73N is attached to the output rotation shaft 8 by a sliding key connection, and can be reciprocated relatively in the direction of the rotation center 8X, but around the rotation center 8X. Relative rotation is prevented. Further, the second rotary valve member 73N is directed toward the other side (right rear side in FIG. 2) of the central member 71 by the second coil spring 74N wound around the output rotation shaft 8 in the second chamber 72N. Is energized. The second rotary valve member 73N has a second communication long hole 731N extending in an arc shape in the circumferential direction around the output rotation shaft rotation center 8X at a position separated from the output rotation shaft rotation center 8X by the second distance D2.

  As can be seen from FIGS. 2 and 4, the first communication long hole 731M and the second communication long hole 731N extend around an angle range smaller than 180 degrees around the output rotation shaft rotation center 8X. Further, the first communication long hole 731M and the second communication long hole 731N are arranged with a phase shifted by 180 degrees around the output rotation shaft rotation center 8X. This positional relationship does not change even when the rotary shaft 8 rotates.

  A first distribution intake / exhaust port 721M is attached to the first chamber 72M. The first distribution intake / exhaust port 721 </ b> M is connected to the first main body intake / exhaust port 21 </ b> A of the engine main body 2 by a first intake / exhaust pipe 75.

  Similarly, a second distribution intake / exhaust port 721N is attached to the second chamber 72N. The second distribution intake / exhaust port 721 </ b> N is connected to the second main body intake / exhaust port 21 </ b> B of the engine body 2 by a second intake / exhaust pipe 76.

  The external air inlet 711 is connected to a working steam supply source (not shown). The external exhaust port 712 is connected to an exhaust device (not shown). This exhaust device may simply emit steam into the atmosphere. The output rotating shaft 8 is coupled with a driven device such as a generator M.

  Thus, according to the intake / exhaust distribution switching mechanism of the reciprocating steam engine of the present embodiment, the following first control state and second control state can be alternately realized as the output rotation shaft 8 rotates. it can.

  That is, in the first control state, as shown in FIGS. 3 and 4, the first internal intake port 713M and the first chamber 72M communicate with each other via the first communication long hole 731M, and the second communication length. The second internal exhaust port 714N and the second chamber 72N communicate with each other through the hole 731N. Thereby, the steam supplied from the working steam supply source to the external intake port 711 is supplied to the first chamber 72M through the intake passage 715, and further through the first intake / exhaust pipe 75 to the first main body intake / exhaust port 24A. To the first main body cylinder 21A. At the same time, the steam in the second main body cylinder 21B is discharged to the second chamber 72N through the second main body intake / exhaust port 24B and the second intake / exhaust pipe 76, and further through the exhaust path 716 and the external exhaust port 712, the exhaust device. Is discharged.

  On the other hand, in the second control state, as shown in FIG. 2, the first internal exhaust port 714M and the first chamber 72M communicate with each other via the first communication long hole 731M, and the second communication long hole 731N is connected. The second internal intake port 713N and the second chamber 72N communicate with each other. As a result, the steam supplied from the working steam supply source to the external intake port 711 is supplied to the second chamber 72N via the intake passage 715, and further to the second main body intake / exhaust port 24B via the second intake / exhaust pipe 76. To the second main body cylinder 21B. At the same time, the steam in the first main body cylinder 21A is discharged to the first chamber 72M through the first main body intake / exhaust port 24A and the first intake / exhaust pipe 75, and further through the exhaust passage 716 and the external exhaust port 712 to the exhaust device. Is discharged.

  In the operation of the reciprocating steam engine of the present embodiment as described above, the first rotary valve member 73M and the second rotary valve member 73N are respectively connected to one of the central members 71 by the first coil spring 74M and the second coil spring 74N. Since it is urged toward the surface on the side and the other side, the steam enters the first chamber 72M or the second chamber 72N from the intake passage 715 without passing through the first communication long hole 731M or the second communication long hole 731N. Is prevented from leaking out.

  Since the above embodiment uses the operation control unit 6 having a characteristic intake / exhaust distribution switching mechanism, the number of pipes through which steam is circulated between the engine body and the operation control unit is small, and the structure is It is very simple and can be reduced in size, can be operated with relatively low pressure steam obtained from a waste heat boiler or the like, and can output at a high speed of about 400 rpm. This makes it possible to drive the generator without using a speed increasing device or the like. Further, in this embodiment, since a mechanism using an expensive crankshaft is not used in the motion conversion unit, it is easy to reduce the cost of the device, and it is possible to promote effective use of energy resources.

  FIG. 5 is a schematic exploded perspective view showing a motion converter of another embodiment of the reciprocating steam engine according to the present invention. In FIG. 5, members or parts having the same functions as those shown in FIGS. 1 to 4 are denoted by the same reference numerals.

  In the present embodiment, the shape of the piston rod 23 that connects the first main body piston 22A and the second main body piston 22B that constitute the engine main body 2 and the shape of the first engagement portion 41 that constitutes the motion conversion portion 4 are described. Only in the embodiment shown in FIGS. However, the action of the piston rod 23 and the first engaging portion 41 is in principle the same as that of the embodiment shown in FIGS.

  Therefore, according to this embodiment, the same operation and effect as those of the above-described embodiments of FIGS.

By using the configuration of the operation control unit 6 having the characteristic intake / exhaust distribution switching mechanism as described above, it is possible to configure a reciprocating pump that has a very simple structure and can be miniaturized. In this case, the following changes are generally made to the above embodiment:
(1) Use fluid instead of steam as an object to be sucked and exhausted (discharged):
(2) The output rotating shaft 8 is used as an input rotating shaft; for this reason, a prime mover (for example, an electric motor) is connected to the rotating shaft 8 instead of the generator M:
(3) The motion converter 4 converts the rotary motion of the rotary shaft 8 into the reciprocating motion of the piston:
(4) Based on the reciprocating motion of the first main body piston 22A and the second main body piston 22B in the first main body cylinder 21A and the second main body cylinder 21B, fluid is sucked from the external intake port 711 and fluid is discharged from the external exhaust port 712. The pump that discharges is performed.

  Such a reciprocating pump can be generalized and described with reference to the description of the configuration of the reciprocating steam engine.

A main body for reciprocating the piston in the cylinder, a motion converter for converting the rotational motion of the input rotary shaft into the reciprocating motion of the piston of the main body, and a fluid for the cylinder according to the rotational phase of the input rotary shaft A reciprocating pump having an operation control unit for controlling supply and discharge of
The main body includes a first main body cylinder and a second main body cylinder arranged to face each other, a first main body piston and a second main body piston respectively accommodated in the first main body cylinder and the second main body cylinder, A piston rod that connects the first main body piston and the second main body piston to each other, a first main body intake / exhaust port attached to the first main body cylinder, and a second main body intake / exhaust port attached to the second main body cylinder And having
The motion converter is attached to the piston rod and extends in a direction crossing the reciprocating direction; the motion converter is attached to the output rotating shaft and is eccentrically positioned from the output rotating shaft; A second engagement portion that is engaged with the first engagement portion so as to be relatively movable in a direction in which the first engagement portion extends.
The operation control unit includes an intake / exhaust distribution switching mechanism attached to the input rotation shaft so as to allow rotation of the input rotation shaft,
The intake / exhaust distribution switching mechanism includes a central member, a first chamber located on one side of the central member and a second chamber located on the other side with respect to the direction of the rotational center of the input rotational shaft, and the output rotational shaft. A first rotary valve member and a second rotary valve member respectively housed in the first chamber and the second chamber so as to rotate together with
The central member includes an external intake port, an external exhaust port, a first internal intake port and a first internal exhaust port that open to the one side, a second internal intake port and a second internal exhaust port that open to the other side, An intake passage for communicating the external intake port with the first internal intake port and the second internal intake port, and an exhaust passage for communicating the external exhaust port with the first internal exhaust port and the second internal exhaust port. With
The first internal intake port and the first internal exhaust port are spaced apart from each other by a first distance from the rotation center of the input rotation shaft and are located on opposite sides with respect to the rotation center of the input rotation shaft, and the second internal intake port And the second internal exhaust port is separated from the rotation center of the input rotation shaft by a second distance and is located on the opposite side with respect to the rotation center of the input rotation shaft,
The first rotary valve member is in contact with the surface on the one side of the central member and is circumferentially around the rotation center of the input rotation shaft at a position separated from the rotation center of the input rotation shaft by the first distance. Has a first communication slot extending in an arc shape,
The second rotary valve member is in contact with the other surface of the central member and is circumferentially around the rotation center of the input rotation shaft at a position separated from the rotation center of the input rotation shaft by the second distance. Has a second communication slot extending in an arc shape,
The first chamber is provided with a first distribution intake / exhaust port, the first distribution intake / exhaust port is connected to the first main body intake / exhaust port of the main body, and the second chamber has a second distribution port. A distribution intake / exhaust port is provided, and the second distribution intake / exhaust port is connected to a second main body intake / exhaust port of the main body,
The intake / exhaust distribution switching mechanism causes the first internal intake port and the first chamber to communicate with each other through the first communication slot and the second communication slot through the rotation of the input rotation shaft. A first control state in which intake to the first main body cylinder and exhaust from the second main body cylinder are simultaneously performed based on the communication between the second internal exhaust port and the second chamber; Based on the communication between the first internal exhaust port and the first chamber through a communication long hole, and the communication between the second internal intake port and the second chamber through the second communication long hole, Alternately realizing a second control state in which exhaust from the first main body cylinder and intake to the second main body cylinder are simultaneously performed;
A reciprocating pump characterized by that.

2 engine main body 21A first main body cylinder 21B second main body cylinder 22A first main body piston 22B second main body piston 23 piston rod 24A first main body intake / exhaust port 24B second main body intake / exhaust port 26 base member 4 motion conversion unit 41 first 1 engagement portion 42 2nd engagement portion 6 operation control portion 71 central member 711 external intake port 712 external exhaust port 713M first internal intake port 713N second internal intake port 714M first internal exhaust port 714N second internal exhaust port 715 Intake passage 716 Exhaust passage 72M First chamber 721M First distribution intake / exhaust port 72N Second chamber 721N Second distribution intake / exhaust port 73M First rotary valve member 731M First communication long hole 73N Second rotary valve member 731N Second communication length Hole 74M First coil spring 74N Second coil spring 75 First intake / exhaust pipe 76 Second intake / exhaust pipe Type 8 Output rotation shaft 8X Output rotation shaft rotation center 81 Disk-shaped member 82 Projection M Generator

Claims (4)

An engine body for generating reciprocating motion of the piston in the cylinder by the action of steam; a motion converting portion for converting reciprocating motion of the piston of the engine body into rotational motion of the output rotating shaft; and A reciprocating steam engine comprising an operation control unit that controls supply and discharge of the steam to and from the cylinder according to a rotation phase;
The engine main body includes a first main body cylinder and a second main body cylinder arranged so as to face each other, and a first main body piston and a second main body piston respectively accommodated in the first main body cylinder and the second main body cylinder, A piston rod connecting the first main body piston and the second main body piston to each other, a first main body intake / exhaust port attached to the first main body cylinder, and a second main body intake / exhaust attached to the second main body cylinder. Having a mouth,
The motion converter is attached to the piston rod and extends in a direction crossing the reciprocating direction; the motion converter is attached to the output rotating shaft and is eccentrically positioned from the output rotating shaft; A second engagement portion that is engaged with the first engagement portion so as to be relatively movable in a direction in which the first engagement portion extends.
The operation control unit includes an intake / exhaust distribution switching mechanism attached to the output rotation shaft so as to allow rotation of the output rotation shaft,
The intake / exhaust distribution switching mechanism includes a central member, a first chamber located on one side of the central member and a second chamber located on the other side with respect to the direction of the rotational center of the output rotational shaft, and the output rotational shaft. A first rotary valve member and a second rotary valve member respectively housed in the first chamber and the second chamber so as to rotate together with
The central member includes an external intake port, an external exhaust port, a first internal intake port and a first internal exhaust port that open to the one side, a second internal intake port and a second internal exhaust port that open to the other side, An intake passage for communicating the external intake port with the first internal intake port and the second internal intake port, and an exhaust passage for communicating the external exhaust port with the first internal exhaust port and the second internal exhaust port. With
The first internal intake port and the first internal exhaust port are spaced apart from each other by a first distance from the rotation center of the output rotation shaft and are located on opposite sides with respect to the rotation center of the output rotation shaft, and the second internal intake port And the second internal exhaust port is separated from the rotation center of the output rotation shaft by a second distance and is located on the opposite side with respect to the rotation center of the output rotation shaft,
The first rotary valve member is in contact with the surface on the one side of the central member and is circumferentially around the rotation center of the output rotation shaft at a position separated from the rotation center of the output rotation shaft by the first distance. Has a first communication slot extending in an arc shape,
The second rotary valve member is in contact with the surface of the other side of the central member, and in a circumferential direction around the rotation center of the output rotation shaft at a position separated from the rotation center of the output rotation shaft by the second distance. Has a second communication slot extending in an arc shape,
The first chamber is provided with a first distribution intake / exhaust port, the first distribution intake / exhaust port is connected to the first main body intake / exhaust port of the engine main body, and the second chamber has a second distribution intake / exhaust port. 2 distribution intake / exhaust ports are provided, and the second distribution intake / exhaust ports are connected to the second main body intake / exhaust ports of the engine main body,
The intake / exhaust distribution switching mechanism causes the first internal intake port and the first chamber to communicate with each other through the first communication long hole and the second communication long hole through the rotation of the output rotation shaft. A first control state in which intake to the first main body cylinder and exhaust from the second main body cylinder are simultaneously performed based on the communication between the second internal exhaust port and the second chamber; Based on the communication between the first internal exhaust port and the first chamber through a communication long hole, and the communication between the second internal intake port and the second chamber through the second communication long hole, Alternately realizing a second control state in which exhaust from the first main body cylinder and intake to the second main body cylinder are simultaneously performed;
A reciprocating steam engine characterized by that.   The first rotary valve member is biased toward one surface of the central member, and the second rotary valve member is biased toward the other surface of the central member. The reciprocating steam engine according to claim 1.   The one side surface of the central member and the surface of the first rotary valve member that comes into contact with the one side surface, and the other side surface of the central member and the second rotary valve that comes into contact with the other side surface 3. The reciprocating steam engine according to claim 1, wherein the surface of each member is orthogonal to the rotation center of the output rotation shaft.   The reciprocating steam engine according to any one of claims 1 to 3, wherein the external intake port is connected to a working steam supply source.

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