JPH03182675A - External combustion engine - Google Patents

Abstract

PURPOSE:To facilitate execution of a welding work and to shorten a working time by dividing a hollow piston into two sections of the one being a piston dome and the other being a piston bottom and incorporating a heat reflection plate in the hollow piston in a manner to be positioned astride a connection part therebetween. CONSTITUTION:A piston 1 is divided into two sections of the one being a piston dome 8a and the other being a piston bottom 8b, and a peripheral edge bent cylinder part 6a of a heat reflection plate 6 is engaged in a manner to be positioned astride a connection part (c) therebetween. The peripheral edge cylinder part 6a is engaged with the opening part of the piston bottom 8b, and the inner edge thereof is welded at d' to the bottom 8b. The dome 8a is placed on the bottom 8b, and a joint therebetween is welded at (d) for coupling. Since the joint (c) forms a guide member positioned at the bent cylinder part 6a, during welding of the connection part (c), a given jig is eliminated, roundness is ensured, a welding work is facilitated, and a working time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an external combustion engine such as a Brummyer (VM) cycle or a Stirling engine.

<Prior art> Conventionally, pistons used in this type of external combustion engine have a piston dome a as shown in Fig. 4 in order to reduce weight.
and the piston bottom b are combined to form a hollow shape. In this case, piston dome a and piston bottom b
The connecting part C has an interlocking shape, and a true guard (jig)
The piston dome a and the piston bottom b are integrated by welding d. In this case, a heat reflecting plate e for reducing radiation heat transfer inside the piston was provided at a location different from the welding location dtI.

<Problems to be Solved by the Invention> However, in this process of welding with a welding bolt (not shown), the piston dome and the piston bottom are not welded accurately and the roundness cannot be maintained. (For example, the same applies to Grand Duke H162-21i803).

Furthermore, welding using a true metal increases the number of steps required to form the piston dome and bottom joint, and the number of steps required to join the pistons by one hour, resulting in a considerable increase in cost.

In view of the above-mentioned circumstances, the present invention aims to provide an external combustion engine that solves the above-mentioned problems by combining a heat reflecting plate at the connection point between the piston dome and the piston bottom. .

Means for Solving the Problems> The present invention provides an external combustion engine in which the inside of the cylinder is divided by hollow screws divided in the axial direction. It has a built-in heat reflector that spans the connection to the body.

In a VM cycle external combustion engine, the piston of the high-temperature side cylinder and the piston of the low-temperature side cylinder, which are arranged orthogonally to each other, are connected to the rotating shaft, respectively. It performs appropriate reciprocating motion in conjunction with the drive of a connected crank mechanism, thereby causing pressure bladder movement in the enclosed medium within the cylinder.

In this case, the piston is formed by fitting the connecting part (sticking position) where the piston dome and the bottom meet into a bent cylinder part bent around the periphery of the heat reflecting plate that partitions the hollow longitudinal direction. Since the piston dome and the bottom are set in this manner, the piston dome and the bottom can be welded into the cylinder without using a jig, and the piston dome becomes a perfect circle, so that reliable reciprocating motion is possible.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic diagram of a VM cycle drive type external combustion engine, where 1 and 2 are high-temperature side cylinders 3 and 3 filled with a working medium, which are arranged at right angles to each other. This is a piston built into the low temperature side cylinder 4. As shown in Fig. 2, this piston 1.2 is hollow in order to reduce its weight, and the piston 1 is designed to prevent radiation heat transfer between the high pressure chamber 3a of the high temperature side cylinder 3 and the medium chamber 3b. , in the piston 2, the cold chamber 4 of the low temperature side cylinder
In order to eliminate radiant heat transfer between the inner chamber 4b and the inner chamber 4b, a heat reflecting plate 6 with a small diameter conduction hole 5 is installed in the hollow chamber 7.
It is set up in

In this case, the main body of the piston 1.2 adopts a split body structure,
The piston dome 8a, which is one of the divided bodies, and the piston bottom 8b, which is the other divided body, are connected at the connecting part C by welding d, and the lower part of the bottom 8b is connected to the piston rod 9.
It is connected by a screw f to a base 8c which is attached to the base body 8c. This piston dome 8a and piston bottom 8b
The welding process is simplified by exposing the peripheral bent cylindrical portion 6a of the heat counter plate 6 to the inside of the welding joint position.

Further, at the base end of the piston 2, there is a crank machine $1 mounted on a rotating shaft 11 provided in a machine chamber 10 located at an intermediate position.
1g12 are connected to each other for reciprocating motion with a 90" offset.The high pressure chamber 3a of the high temperature side cylinder 3 is equipped with a tube type high temperature side heat exchanger 1 which is heated from the outside by a combustor 22.
3, a heat storage 14 and a medium temperature side heat exchanger 15 are disposed between the heat exchanger 13 and the medium temperature chamber 3b, and a low temperature side heat exchanger 15 is provided between the low temperature chamber 4a and the medium temperature chamber 4b of the low temperature side cylinder 4. exchanger 1
6, a regenerator 17, and an auxiliary medium temperature side heat exchanger 18,
1. Both of the medium greenhouses 3b and 4b communicate with each other through a communication chamber 19. 20 is an outdoor heat exchanger installed outdoors, one end is connected to the medium temperature side heat exchanger 15 on the high temperature cylinder 3 side, and the other end is connected to the medium temperature side heat exchanger 18 on the low temperature cylinder 4 side through the auxiliary medium temperature side heat exchanger 18. A closed cycle returns to the exchanger 15, and 2] is an indoor heat exchanger installed in the living room and connected to the low-temperature side heat exchanger 16, which together constitute an air-conditioning system using an external combustion engine.

Next, to explain this effect, when forming the piston 1.2, first, the bent cylinder part 6a formed on the periphery of the heat reflecting plate 6 is fitted into the opening of the piston bottom 8b, and the inner edge end is welded d. ' is performed once, and then the piston dome 8a is placed on the bottom 8b, and the piston dome 8a and the bottom 8b are joined by welding d at the joint. That is, the connection part C between the piston dome 8a and the piston bottom 8b
By using the guide member to be positioned on the bent cylindrical portion 6a of the heat reflecting plate 6, the bent cylindrical portion 6a of the heat reflecting plate 6 does not require a predetermined jig when welding the connecting portion C, and can be made into a perfect circle. He never loses his temper. After this, the piston bottom 8b is attached to the base 8.
By screwing f into c, integral pistons 1 and 2 are formed.

Here, if the rotating shaft 11 is rotated and the high-temperature side piston 1 and the low-temperature side piston 2 are alternately reciprocated via the crank mechanism 12, pressure fluctuations are caused in the enclosed refrigerant, and when the pressure increases, the medium temperature side heat exchanger It becomes a heat cycle engine that provides heat to 15.18 and pumps up heat from the low temperature side heat exchanger 2g16 for pressure drop.

In the case of cooling operation, the closed cycle connects the low temperature side heat exchanger 16 and the indoor heat exchanger 21, and the medium temperature side heat exchanger 15
．． It is a closed cycle that connects L8 and the outdoor heat exchanger 20, and a low-temperature medium is sent to the indoor heat exchanger 21 by a circulation pump 23, and the heat of this medium is released indoors for cooling, and a high-temperature medium is sent to the outdoor heat exchanger 20. is sent through the circulation pump 24 to discharge the heat of this medium to the outside.

During heating operation, a flow path switching valve (not shown) is used to connect the medium-temperature side heat exchanger 15 and the indoor heat exchanger 21, and the indoor heat exchanger 21 releases the heat of the high-temperature medium into the room. At the same time, the outdoor heat exchanger 20 discharges the heat of the low-temperature medium that has passed through the low-temperature side heat exchanger 16 to the outside.

<Effects of the Invention> As described above, the external combustion engine of the present invention incorporates a heat reflecting plate in the hollow piston and straddles the connecting portion between the piston dome and the piston bottom, and connects this heat reflecting plate. Since it also serves as a guide member for the welding section, welding becomes easier and the work time is shortened, and since there is no need for a jigs like in the past, the roundness of the hollow can be ensured, etc. It has the effect of

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an external combustion engine showing an embodiment of the present invention;
The figure is an enlarged sectional view of the piston, FIG. 3 is an explanatory diagram of welding the piston dome and piston bottom, and FIG. 4 is an explanatory diagram of welding the piston dome and piston bottom of a conventional product. 1.2...Piston, 3...High temperature side cylinder, 4.
...Low temperature side cylinder, 6...Heat reflecting plate, 8a...Piston dome, 8b...Piston bottom, 11.
...Rotating shaft, 12...Crank mechanism, 13...High temperature side heat exchanger, 14...Regenerator, 15...Medium temperature side heat exchanger, 16...Low temperature side heat exchanger, 17 ...Regenerator,
18... Auxiliary medium temperature side heat exchanger, 19... Communication chamber, 2
0...Outdoor heat exchanger, 21...Indoor heat exchanger, C.
・Connection part, d...Welding. Patent Application Same Agent Tokyo Gas Co., Ltd. Osaka Gas Co., Ltd. Toho Gas Co., Ltd. Sanyo Electric Co., Ltd. Yukio Omata = l I

Claims (1)

[Claims] 1. In an external combustion engine in which the inside of the cylinder is partitioned by a hollow piston divided in the axial direction, the piston has a built-in heat reflecting plate that straddles the connection between one divided body and the other divided body. An external combustion engine characterized by: