JPH0668421B2 - Stirling engine driven refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a Stirling engine driven refrigerator.

2. Description of the Related Art A conventional Stirling engine driven refrigerator of this type has a structure as shown in FIG. 1 is a container, helium is inside,
A working fluid such as hydrogen (hereinafter referred to as helium) is enclosed. 2 is a heater for heating helium, 3 is a cooler for cooling helium, 4 is a regenerator, 5 is a displacer that moves up and down slidably on the inner wall of the container 1, 6 is slidable on the inner wall of the container It is a piston that moves up and down. 7 is a gas spring space. On the other hand, 8 and 9 are low temperature heat exchangers, 10 is a pump, 11 and 12 are high temperature heat exchangers, 13 is a pump, and 14 is a regenerator.

Reference numeral 15 is a displacer that moves up and down slidably on the inner wall of the container 1, and 16 is a gas spring space.

Next, the operation will be described. The piston 6 and the upper part constitute a Stirling engine, and the piston 6 and the lower part constitute a Stirling refrigerator. The piston 6 is a piston that takes out the output of the Stirling engine, and is also a piston of the Stirling refrigerator.

Explaining from the side of the Stirling engine, the displacer 5
And the piston 6 oscillates up and down. Normally, the phase angle at the position of the displacer is
It is advancing from 30 ° to 90 °.

Therefore, a part of the heat that enters the helium from the heater 2 is converted into work performed by the helium in the upper part of the piston 6, and a part of the heat is discharged to the outside of the container 1 through the cooler.

Further, the volume of the gas spring space 7 is increased or decreased by the vertical movement of the displacer 5, and the pressure of helium is increased or decreased.
Therefore, it works as a spring for the displacer 5 and serves to make the displacer 5 move properly.

Next, the Stirling refrigerator side will be described.

The displacer 15 and the piston 6 are vibrating vertically. At this time, the phase angle at the position of the displacer 15 is advanced by 90 ° with respect to the phase angle at the position of the piston 6. Therefore, the temperatures of the expansion space 17 and the low temperature space 18 are lower than the temperatures of the compression space 19 and the high temperature space 20.

On the other hand, the closed flow path including the low temperature heat exchangers 8 and 9 and the pump 10 contains brine and circulates in the flow path. Further, brine is contained in the closed flow path including the high temperature heat exchangers 11 and 12 and the pump 13 and circulates in the flow path.

Therefore, the cold heat of the low temperature space 18 is carried to the low temperature heat exchanger 9 and used. The heat of the high temperature space 20 is transferred to the high temperature heat exchanger 12 and is discarded.

Therefore, part of the work performed by the helium on the top of the piston 6 for the piston 6 is discarded from the high temperature heat exchanger 12 to the outside,
Further, a part of the heat transferred from the low temperature heat exchanger 9 to the brine is discharged from the high temperature heat exchanger 12 to the outside.

However, with such a structure, the temperature of the cold heat obtained from the brine of the low temperature heat exchanger 9 is higher than the helium temperature in the low temperature space 18. This is because the low temperature heat exchangers 8 and 9 are used. Similarly, the temperature of the heat obtained from the brine of the high temperature heat exchanger 12 becomes lower than the helium temperature in the high temperature space 20. This is because the high temperature heat exchangers 11 and 12 are used.

In this way, a difference occurs between the temperature of helium in the low temperature space 18 and the temperature of cold heat obtained from the brine of the low temperature heat exchanger 9, and the temperature of helium in the high temperature space 20 and the temperature obtained from brine of the high temperature heat exchanger 12 become different. Due to the difference, the coefficient of performance of the conventional Stirling refrigerator is lower than that without the low temperature heat exchangers 8 and 9 and the high temperature heat exchangers 11 and 12.

Means for Solving the Problems The present invention is directed to a regenerator provided in the flow path B, and a flow path _{C connecting the} expansion space and a point P _C between the regenerator of the flow path B and the expansion space. Alternatively, the flow path D communicating the point P _D between the regenerator of the flow path B and the compression space and the flow path C or the flow path D
And a means for exchanging heat between the fluid A and the outside of the flow channel C or the flow channel D, and a means for opening and closing the flow channel C or the flow channel D.

Operation The effects of this technical means are as follows. That is, since the working fluid of the Stirling refrigerator directly flows into the flow path C or the flow path D, the high temperature heat exchanger or the low temperature heat exchanger is
Therefore, the coefficient of performance of the Stirling refrigerator increases.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 21 denotes a container in which a working fluid such as helium or hydrogen (hereinafter referred to as helium) is enclosed.
22 is a heater that heats helium, 23 is a cooler that cools helium, 24 is a regenerator, 25 is a displacer that moves up and down slidably on the inner wall of the container 21, 26 is slidable on the inner wall of the container 21 It is a piston that moves up and down. 27 is a gas spring space. 28 is a low temperature space, 29 is a high temperature space, and 30 is a regenerator.

Reference numeral 31 is a flow path that connects the expansion space 32 and the low temperature space 28, and valves 33 and 34, a pump 35, and a heat exchanger 36 are provided therein.
Further, 37 is a flow path that connects the compression space 38 and the low temperature space 29,
Valves 39 and 40, a pump 41, and a heat exchanger 42 are provided therein. 30 is a regenerator. Reference numeral 43 is a displacer that moves up and down slidably on the inner wall of the container 21.

Next, the operation will be described. The upper part of the piston 26 constitutes a Stirling engine, and the lower part of the piston 26 constitutes a Stirling refrigerator. The piston 26 is a piston that takes out the output of the Stirling engine and is also the piston of the Stirling refrigerator. From the Stirling engine side, displacer 25 and piston
26 vibrates up and down, and the phase angle at the position of the displacer is normally 30 to 90 degrees ahead of the phase angle at the position of the piston 26.

Therefore, a part of the heat that has entered the helium from the heater 22 is converted into work performed by the helium in the upper portion of the piston 26, and a part of the heat is discharged to the outside of the container 21 through the cooler 23.

In addition, the volume of the gas spring space 27 increases and decreases due to the vertical movement of the displacer 25, and the pressure of helium increases and decreases.
Therefore, it works as a spring for the displacer 25 and serves to make the displacer 25 move properly.

Next, the Stirling refrigerator side will be described.

The displacer 43 and the piston 26 are vibrating vertically. At this time, the phase angle at the position of the displacer 43 is advanced by about 90 ° with respect to the phase angle at the position of the piston 26. As a result, the helium in the expansion space 32 and the low temperature space 28 has a low temperature, and the helium in the compression space 38 and the high temperature space 29 has a high temperature.

By the way, the helium in the expansion space 32 has a valve 33, 34 for a short time during which the displacer 43 and the piston 26 make one reciprocation.
Is opened and heated by the pump 35 through the heat exchanger 36 to become a high temperature and sent to the low temperature space 28. As a result, the cold heat of helium in the expansion space 32 is utilized through the heat exchanger 36. Therefore, the helium in the expansion space 32 is kept at a constant temperature. Similarly, the helium in the compression space 38 is
And a short period of time during which the piston 26 makes one reciprocation, valve 3
9, 40 are opened, and are cooled by the pump 41 through the heat exchanger 42 to become a low temperature and are sent to the high temperature space 29.

Therefore, the helium in the compression space 38 is kept at a constant temperature.
As described above, in the present embodiment, in heat exchange between the heat source and helium, unlike the conventional example, the heat exchangers 8 and 11 for helium and brine are not provided, and helium is directly used as the heat exchanger 36, 42
The effect is that the coefficient of performance increases as compared to the conventional example.

EFFECTS OF THE INVENTION As described above, the present invention improves the coefficient of performance of the heat pump device by the configuration such that heat is directly exchanged with the working medium in the heated space.

[Brief description of drawings]

FIG. 1 is a sectional view of a Stirling engine driven refrigerator according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional Stirling engine driven refrigerator. 21 …… container, 22 …… heater, 23 …… cooler, 24 …… regenerator, 25 …… displacer, 26 …… piston, 43 …… displacer, 28 …… low temperature space, 29 …… high temperature space, 30 ...
… Regenerator, 33,34 …… valve, 35 …… pump, 36 …… heat exchanger, 39,40 …… valve, 41 …… pump, 42 …… heat exchanger.

Claims (2)

[Claims] 1. A container and a fluid A contained in the container.
A displacer slidably movably disposed on the inner wall of the container, and a piston displaceably slidably movably disposed on the inner wall of the container and moved by a work from a Stirling engine A flow path B provided so as to connect the expansion space surrounded by the inner wall of the container and the displacer with the compression space surrounded by the inner wall of the container, the displacer and the piston; A regenerator provided in the channel, and a regenerator and a compression space of the channel C and / or the channel B for communicating the point P _C between the regenerator of the channel B and the expansion space with the expansion space. A flow path D that connects the point P _D between the flow path C and the compression space, a flow path C and / or a fluid A provided in the flow path D, and a flow path C and / or a flow path D.
A Stirling engine driven refrigerator having a means for exchanging heat with the outside and a means for opening and closing the flow passage C and / or the flow passage D. 2. A first passage provided with a flow passage for allowing a fluid in a container and a working fluid in a Stirling engine to flow.
A Stirling engine driven refrigerator as described in the item.