JPH0886524A - Vuill-ermier gas engine - Google Patents

Abstract

PURPOSE: To increase a fin efficiency to improve heat transfer performance and improve workability as well as the property of incorporation by a method wherein a high-temperature side middle temperature part heat exchanger in a Vuill-ermier gas engine is constituted so as to be provided with a multitude of fins having truncated section. CONSTITUTION: A Vuill-ermier gas engine, equipped with a high-temperature side high-temperature part heat exchanger 43, a high-temperature side reproducer 1, a high-temperature side middle-temperature part heat exchanger 37, a low-temperature side middle-temperature part heat exchanger 42, a low-temperature side reproducer 2, a low-temperature side low-temperature part heat exchanger 38, a high-temperature displacer 9 and a low-temperature displacer 10, is provided with slender truncated fins 38b, formed by cutting the slender grooves 38a along the inner periphery contacted with the sleeve of the cylindrical low-temperature side low-temperature part heat exchanger 38 with an equal interval. According to this method, heat is deprived through the fins 38b when operating gas flows along the grooves 38a, however, when the configuration of the fins 38b is a truncated shape, a temperature of the whole surface of the fin 38b is approached to the temperature of the root 38'b and becomes substantially uniform whereby heat exchanging efficiency between the operating gas conducted through the grooves 38a can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Viller-gas engine used for air conditioning for heating and cooling.
r Machine).

[0002]

2. Description of the Related Art A conventional Wilmiel gas engine (hereinafter VM
FIG. 4 shows a cross-sectional view of a main part of an engine (abbreviated as engine), and its structure and operation will be described. The high temperature displacer 9 has a stepped rod in which a rod 19 having a diameter a and a rod 20 having a diameter b are connected in series, and the end portion of the rod 20 is forcibly moved upward and downward in the figure by a vibrator (not shown). Driven to. On the other hand, on the outside of the cylindrical sleeves 15a and 15b, the high temperature side high temperature part heat exchanger 43, the high temperature side regenerator 1,
High temperature side middle temperature part heat exchanger 7, low temperature side middle temperature part heat exchanger 12,
The low temperature side regenerator 2 and the low temperature side low temperature part heat exchanger 8 are arranged, and the high temperature side 7 and the low temperature side 12 of the middle temperature part heat exchanger are integrated via a ring-shaped portion 21. Further, a high temperature side cylindrical shell 4 and medium temperature side cylindrical shells 6a, 6b are provided outside the high temperature side regenerator 1, the high temperature side intermediate temperature part heat exchanger 7, and the low temperature side intermediate temperature part heat exchanger 12, respectively. A low temperature side cylindrical shell 5 is disposed outside the low temperature side regenerator 2 and the low temperature side low temperature section heat exchanger 8 to be isolated from the outside. An electric heater 3 is provided on the head of the high temperature side cylindrical shell 4, and heat is taken out from the high temperature side middle temperature section heat exchanger 7 and the low temperature side middle temperature section heat exchanger 12 for heating, and the low temperature side low temperature section for cooling. Cold heat is applied from the heat exchanger 8. Water as the carrier medium is arranged outside each heat exchanger. Here, the working water such as helium in the high temperature side working space 16 and the middle temperature side working space 17 heated by the electric heater 3 heats the outer water through the high temperature side middle temperature part heat exchanger 7, while
The working gas in the low temperature side working space 18 and the medium temperature side working space 17 heats the outside water via the low temperature side medium temperature part heat exchanger 12, and at the same time from the outside water via the low temperature side low temperature part heat exchanger 8. Take away the heat. At this time, the high temperature displacer 9
The up and down movement of the working gas alternates between the high temperature side working space 16 and the middle temperature side working space 17 through the high temperature side high temperature part heat exchanger 43, the high temperature side regenerator 1 and the high temperature side middle temperature part heat exchanger 7. Let Further, the vertical movement of the low temperature displacer causes the working gas to flow between the low temperature side working space 18 and the middle temperature side working space 17, and the low temperature side low temperature part heat exchanger 8, the low temperature side regenerator 2 and the low temperature side middle temperature part heat exchanger 12. Alternate through. At this time, pressure fluctuations occur due to changes in the ratio of the high temperature working gas and the low temperature working gas, but the diameters a, b of the rods 19, 20 are
Excitation force is generated in the low temperature displacer 10 due to the difference of
The low temperature displacer 10 operates so as to maintain a certain phase difference from the high temperature displacer 9. At this time, the temperature of each operating space is kept constant by the heat storage action of each regenerator 1, 2. The output of the engine is the heat exchangers 7, 8, 12
The heat released and absorbed is used for heating and cooling.

[0003]

5 and 6 are a sectional elevation view and a plan view of the low temperature side low temperature section heat exchanger 8 shown in FIG. 4, respectively, and FIG. Show. Generally, the heat exchange amount Q is given by the following equation. Q = qAΔtm where q is the heat transmission rate, A is the transfer area, and Δtm is the temperature difference between the working gas medium and the fins. In order to increase this A, conventionally, an elongated rectangular groove 8a as shown in FIG. 7 forms a fin 8b having an elongated rectangular cross section, and the working gas flows through the groove 8a. There is a problem that there is a temperature difference at the root and it is not possible to increase Δtm. High temperature side middle temperature part heat exchanger 7
The structure of the low temperature side intermediate temperature part heat exchanger 12 is also similar, and the same can be said as the above.

[0004]

In order to solve the above problems, the present invention provides a high temperature side high temperature part heat exchanger, a high temperature side regenerator, a high temperature side intermediate temperature part heat exchanger, and a low temperature side intermediate temperature part heat exchanger. , A low temperature side regenerator and a low temperature side low temperature part heat exchanger, and further a high temperature displacer and a low temperature displacer in a Wilmiel gas engine, as a first invention, the high temperature side middle temperature part heat exchanger has a trapezoidal cross section. Provided is a Wilmiel gas engine having a large number of fins, and as a second invention, the low temperature side middle temperature heat exchanger provides a Wilmiel gas engine having a large number of fins of trapezoidal cross section, and as a third invention, The low temperature side heat exchanger is intended to provide a Wilmiel gas engine having a large number of fins having a trapezoidal cross section.

[0005]

When the fin has a triangular cross-section, the temperature of the entire fin surface including the tip of the fin approaches the temperature at the root of the fin and becomes almost uniform, so Δtm becomes large, and therefore the heat The exchange amount Q increases (the more the surface temperature is uniform and constant, the larger Δtm). However, when the heat exchanger is arranged in a cylindrical shape inside the engine, but the fin has a triangular cross-sectional shape, it becomes difficult to form a perfect circle due to the top edge, and the strength becomes weak. Therefore, if the fin has a trapezoidal cross-sectional shape, it is possible to obtain a perfect circle while taking advantage of the advantage of the triangular fin, and the strength is maintained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a VM engine according to the present invention will be described below with reference to FIGS. 1 is a cross-sectional view of a main part of a VM engine according to the present invention, FIG. 2 is a plan view of a low temperature side low temperature part heat exchanger 38 shown in FIG. 1, and FIG. 3 is an enlarged view of part B of FIG. 1 to 3, the same parts as those in FIG. 4 are designated by the same reference numerals, and only different points will be described. As shown in FIGS. 2 and 3, when the cylindrical low temperature side low temperature section heat exchanger 38 cuts the elongated grooves 38a at equal intervals along the inner circumference in contact with the sleeve 15b, elongated trapezoidal fins 38b are formed. . The working gas flows through the groove 38a in a direction perpendicular to the plane of the drawing, and the fin 38
Although heat is taken from b, if the fins 38b are trapezoidal, the temperature of the entire surface of the fins approaches the temperature of the roots 38'b and becomes uniform, and the temperature difference Δt with the working gas flowing in the grooves 38a is increased.
As m increases, the heat exchange amount Q increases. Further, a perfect circle can be easily formed along the sleeve 15b, and the strength can be sufficiently maintained. The high temperature side middle temperature section heat exchanger 37 and the low temperature side middle temperature section heat exchanger 42 can have exactly the same structure and operation.

[0007]

The Wilmier gas engine according to the present invention is
Since the fins are trapezoidal in shape as described above, the fin efficiency is increased, the heat transfer performance is improved, and the cooling and heating capacities can be increased. It is possible to obtain a heat exchanger having good workability and assembling.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of an embodiment of a VM engine according to the present invention.

FIG. 2 is a plan view of the low temperature side low temperature section heat exchanger shown in FIG.

FIG. 3 is an enlarged view of part B in FIG.

FIG. 4 is a sectional view of a main part of a conventional VM engine.

5 is a sectional elevation view of the low temperature side low temperature section heat exchanger shown in FIG. 4. FIG.

6 is a plan view of the low temperature side low temperature section heat exchanger shown in FIG. 4. FIG.

FIG. 7 is an enlarged view of part A of FIG.

[Explanation of symbols]

 1: High temperature side regenerator 2: Low temperature side regenerator 4: High temperature side cylindrical shell 5: Low temperature side cylindrical shell 6a, 6b: Medium temperature side cylindrical shell 9: High temperature displacer 10: Low temperature displacer 15a, 15b: Sleeve 37: High temperature side medium temperature section heat exchanger 38: Low temperature side low temperature section heat exchanger 38a: Groove 38b: Fin 42: Low temperature side medium temperature section heat exchanger 43: High temperature side high temperature section heat exchanger

Claims (3)

[Claims] 1. A high temperature side high temperature part heat exchanger, a high temperature side regenerator,
In the Wilmiel gas engine, which has a high-temperature side intermediate-temperature part heat exchanger, a low-temperature side intermediate-temperature part heat exchanger, a low-temperature side regenerator, and a low-temperature side low-temperature part heat exchanger, the high-temperature side The mid-temperature heat exchanger is a Wilmiel gas engine characterized by having a large number of fins with a trapezoidal cross section. 2. A high temperature side high temperature part heat exchanger, a high temperature side regenerator,
In the Wilmiel gas engine, which has a high temperature side middle temperature part heat exchanger, a low temperature side middle temperature part heat exchanger, a low temperature side regenerator, and a low temperature side low temperature part heat exchanger, the low temperature side heat exchanger has a high temperature displacer and a low temperature displacer. The mid-temperature heat exchanger is a Wilmiel gas engine characterized by having a large number of fins with a trapezoidal cross section. 3. A high temperature side high temperature part heat exchanger, a high temperature side regenerator,
In the Wilmiel gas engine, which has a high temperature side middle temperature part heat exchanger, a low temperature side middle temperature part heat exchanger, a low temperature side regenerator, and a low temperature side low temperature part heat exchanger, the low temperature side heat exchanger has a high temperature displacer and a low temperature displacer. The low-temperature heat exchanger has a number of fins with a trapezoidal cross section, and is a Wilmiel gas engine.