JPH05187316A - External combustion engine for air conditioning - Google Patents

Abstract

PURPOSE:To reduce quantity of heat transfer between a piston and a cylinder, and separate each gas in an actuation space and a hollow space. CONSTITUTION:A first piston 21 and a second piston 22 which define actuation spaces of high and low temperature respectively in a cylinder 24 are connected by a small diameter connecting member 23. The spaces between the connecting member 23, the cylinder 24, the first and the second piston 21, 22 are a hollow space of gas layer. These hollow spaces are divided from each actuation space by seal members provided in the first and the second piston 21, 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external combustion engine for air conditioning called a Wilmie heat pump used for a cooling device, a heating device and the like.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional air-conditioning external combustion engine disclosed in, for example, Japanese Patent Laid-Open No. 2-259261, in which 1 is a high temperature piston, 2 is a low temperature piston, and 3 is a high temperature. Cylinders 4, low temperature cylinders, 3a high temperature working space, 3b a first medium temperature working space, 4b a second medium temperature working space, 4a a low temperature working space, between the high temperature piston 1 and the high temperature cylinder 3, respectively. And low temperature piston 2
Between the cold cylinder 4 and the cold cylinder 4.

Further, 5 is a crank for converting rotational operation into reciprocating linear motion of the piston, 6 is a high temperature heat exchanger leading to the high temperature working space 3a, 7 is a first medium temperature heat exchanger, and 8 is a second medium temperature heat. Exchanger, 9 is a low temperature heat exchanger, 10 is a high temperature regenerator,
11 is a low temperature regenerator, 12 is a heating device that heats the high temperature heat exchanger 6 to heat the gas inside the cylinder, 13 and 14 are circulating water pumps, and the first and second intermediate temperature heat exchangers 7 and 8. The hot water thus obtained and the cold water obtained by the low temperature heat exchanger 9 are sent to the heat exchanger 15 or 16 for air conditioning.

Further, FIG. 3 is a sectional view showing the details of the pistons 1 and 2, and 17 is a hollow space provided for weight reduction and heat conduction reduction, which is a partition wall 2 provided with a small hole 20a.
The inside and outside of each piston 1, 2 are communicated with each other by a passage 18 which is partitioned by 0 and further penetrates to the lower part. 19
Symbols a and 19b are seals provided on the outer circumferences of the pistons 1 and 2 at positions sandwiching the passage 18.

Next, the operation will be described. First, when the high temperature piston 1 inside the high temperature cylinder 3 moves upward, the high pressure gas in the high temperature working space 3a passes through the high temperature heat exchanger 6, the high temperature regenerator 10 and the first medium temperature heat exchanger 7 one after another to the first
Flows into the flow path of the medium temperature working space 3b. On the other hand, when the high temperature piston 1 descends, high pressure gas flows in the opposite direction.

At this time, the gas undergoes a heating action or a cooling action to cause a pressure change. This pressure change is transmitted to the low temperature cylinder 4 as it is, and the reciprocating motion of the low temperature piston 2 interlocked with the high temperature piston 1 by the crankshaft 5 causes the gas to be heated mainly by compression in the second intermediate temperature operation space 4b. On the other hand, the low temperature working space 4a is mainly cooled by expansion.

In this way, the heated or cooled gas heats or cools the circulating water sent by the circulating water pumps 13 and 14 in the second medium temperature heat exchanger 8 or the low temperature heat exchanger 9, Furthermore, each heat exchanger for air conditioning 15,1
It is sent to 6 and used for air conditioning. Here, in order to efficiently perform heating and cooling, as shown in FIG. 4, between the high temperature operating space 3a and the first intermediate temperature operating space 3b or between the second intermediate temperature operating space 4b and the low temperature operating space 4a. A hollow space 17 is provided in each of the pistons 1 and 2 in order to reduce heat transfer and reduce heat conduction.

Further, the thickness of the piston wall is determined by the internal pressure difference between the hollow space 17 and the working spaces 3a, 3b, 4a, 4b. The pressure can be minimized if the pressure in the hollow space 17 is always constant at the average pressure in each working space where the pressure fluctuates. Therefore, in order to obtain this average pressure, the minute passage 18 is provided. Further, at this time, the partition wall 20 functions to reduce the effect of radiation on heat transfer.

[0009]

Since the conventional external combustion engine for air conditioning is constructed as described above, each piston 1, 2
There is a temperature difference related to the temperature of the gas in each working space at both ends of the piston wall. Therefore, there is a gradient temperature distribution in the piston wall and the cylinder wall. Therefore, as the pistons 1 and 2 move, the piston wall and the cylinder wall move. 4A when the high temperature piston 1 moves to the high temperature side, and when it moves to the low temperature side, as shown in FIG. 4B.
As shown in, heat transfer is repeatedly carried out through the gas slightly present between the hot piston 1 and the hot cylinder 3. As a result, there is a problem that heat transfer is promoted and cooling and heating efficiency and performance are reduced.

The invention of claim 1 has been made by paying attention to the above problems, and the heat transfer between the piston wall and the cylinder wall can be reduced by the movement of the piston. Aim to get.

Further, the invention of claim 2 provides an external combustion engine for an air conditioner capable of preventing the gas cycle performance from being impaired by sufficiently separating the gas layer between the two pistons from the respective working spaces in the cylinder. The purpose is to get.

[0012]

In the external combustion engine for air-conditioning according to the invention of claim 1, the first piston and the second piston for separating each gas at two temperature levels are slidable in the cylinder. The first piston and the second piston are movably provided.
The above pistons are connected by a connecting member to form a hollow space of a gas layer together with these pistons and cylinders.

Further, in the external combustion engine for air conditioning according to the invention of claim 2, the first piston and the second piston for separating the respective gases in two temperature levels in the cylinder, and the first piston Of the first piston and the second piston are connected to each other, and a connecting member that forms a hollow space of a gas layer together with the piston and the cylinder is provided, and a seal provided on the outer circumference of the first piston and the second piston is provided. The cylinder is slidable in the cylinder.

[0014]

In the hollow space of the gas layer according to the first aspect of the present invention, the first piston and the second piston share the respective temperatures of the high temperature side and the low temperature side to receive heat transfer between them with a small diameter. This heat transfer inside the piston can be made sufficiently small, and heat transfer from the high temperature side to the low temperature side between the pistons and the cylinder wall can be suppressed.

Therefore, by sufficiently increasing the temperature difference of the gas in the working space separated in the cylinder by the first piston and the second piston, it is possible to improve the efficiency of heat exchange and cooling and heating. To do.

In the seal according to the invention of claim 2, the gas in the hollow space between the first piston and the second piston and the gas in the working space are reliably separated from each other to improve the performance of the gas cycle. To function.

[0017]

【Example】

Example 1. An embodiment of the inventions of claims 1 and 2 will be described below with reference to the drawings. In FIG. 1, 21 is a first piston and 22 is a second piston, which are connected to a cylinder 24 by a rod-shaped connecting member 23 which forms a hollow space 17 for heat insulation. 19c, 19
d is a seal provided on the outer circumference of each of the first and second pistons 21 and 22, and 30 is a partition that forms a part of the first piston 21 and forms a hollow space 21a therein. This is provided with a small hole passage 30a, which communicates the hollow spaces 21a and 17 with each other. The piston structure having such a structure is replaced with two piston structures as shown in FIG. 2 to form an external combustion engine.

Next, the operation will be described. First, as described above, the first piston 21 and the second piston 22 connected by the connecting member 23 perform a reciprocating linear motion along the cylinder 24 by the rotation of the crankshaft 5. At this time, since a thick gas layer is formed between the connecting member 23 and the cylinder 24, the cylinder 24 and each piston 2
There is little heat transfer between 1 and 22.

Further, since the first piston 21 and the second piston 22 are in contact with the gases in the working spaces having different temperatures, there is a temperature difference, but the cross-sectional area is small.
That is, since they are connected through the thin connecting member 23, heat transfer inside the piston can be effectively suppressed. Further, the gas in the hollow space 17 formed between the pistons 21 and 22 is sealed by the seals 19c and 19d provided in the pistons 21 and 22 so that the working space 2 in each cylinder 24 is
Since it is isolated from the gas in Nos. 6 and 27, the performance of the gas cycle is significantly improved as compared with the conventional one. Since the operation of the entire internal combustion engine is the same as the conventional one, the duplicated description will be omitted.

[0020]

As described above, according to the first aspect of the present invention, the first piston and the second piston for separating the gases at the two temperature levels are provided slidably in the cylinder. Since the first piston and the second piston are connected by a connecting member and the hollow space of the gas layer is formed together with these pistons and cylinders, the first piston and the second piston are connected. It is possible to suppress the amount of heat transfer to and from the cylinder wall, and also to suppress the heat transfer inside the piston. Therefore, the high temperature side and the low temperature side separated by each of these pistons can be suppressed. There is an effect that the temperature gradient of the gas in the working space can be made sufficient and that the cooling and heating can be performed with high efficiency.

According to the invention of claim 2, the first piston and the second piston for separating the respective gases at two temperature levels in the cylinder, the first piston and the second piston, respectively. And a connecting member that forms a hollow space of a gas layer together with each of the pistons and the cylinder.
Since the seal provided on the outer circumference of the piston is configured to slide in the cylinder, there is an effect that the gas cycle performance can be improved in addition to the above effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing a piston structure of an external combustion engine for air conditioning according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional external combustion engine for air conditioning and an external combustion engine for air conditioning in which the piston structure in FIG. 1 is adopted.

FIG. 3 is a sectional view showing a piston structure of a conventional external combustion engine for air conditioning.

FIG. 4 is an explanatory diagram showing a state of heat transfer between a conventional piston and a cylinder wall.

[Explanation of symbols]

 6 High Temperature Heat Exchanger (Heat Exchanger) 7 First Medium Temperature Heat Exchanger (Heat Exchanger) 8 Second Medium Temperature Heat Exchanger (Heat Exchanger) 9 Low Temperature Heat Exchanger (Heat Exchanger) 19c, 19d Seal 21 first piston 22 second piston 23 connecting member 24 cylinder

Claims (2)

[Claims] 1. A heat exchange gas sealed in a cylinder is heated and cooled from the outside of the cylinder through a heat exchanger, and the air-conditioning temperature is controlled by the expansion and compression of the gas generated by the heating and cooling. In an external combustion engine for air conditioning that respectively cools and heats a level, a first piston and a second piston that are slidably provided in the cylinder and that separate the gases at two temperature levels,
An external combustion engine for air conditioning, characterized in that the first piston and the second piston are connected to each other, and a connecting member that forms a hollow space of a gas layer together with each piston and cylinder is provided. 2. A heat exchange gas sealed in the cylinder is heated and cooled from the outside of the cylinder via a heat exchanger, and the air-conditioning temperature is controlled by the expansion and compression of the gas generated by the heating and cooling. In an air-conditioning external combustion engine that respectively cools and heats a level, a first piston and a second piston that are slidably provided in the cylinder and that separate the gases at two temperature levels,
A connecting member that connects the first piston and the second piston and forms a hollow space of a gas layer together with each of the piston and the cylinder, and is provided on the outer circumference of the first piston and the second piston, An external combustion engine for air conditioning, comprising a seal that slides on the inner surface of the cylinder.