JPH0651757U - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] [Object] To provide a refrigerating device capable of heating a working gas with high efficiency and suppressing a flow loss of the working gas. [Composition] High temperature chamber 13 of high temperature side cylinder 11 and middle greenhouse 1
4, an external conduit 32 is provided, and electrodes 33 and 34 are provided at predetermined positions in the external conduit 32 which are separated from each other.
The external conduit 32 itself is resistance-heated by energizing 3, 34 and passing a current through the external conduit 32, and heat is directly supplied to the working gas flowing in the external conduit 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for efficiently heating an internal working gas.

[0002]

[Prior art]

 It is generally known that in a heat engine using a gas cycle, such as a Stirling engine (STE, STH) or a Bourmeier heat pump (VMHP), it is necessary to heat the internal working gas.

In this type, conventionally, the working gas is introduced into a large number of thin tubes, and the thin tubes are heated by a gas burner to heat the working gas or to pass a heating wire wound outside the thin tubes. The working gas is heated by heating the thin tube. However, in this method, the heat supplied from the external heating means is transferred to the working gas through the tube wall, so that the heat loss is large and the heating unevenness occurs.

In order to solve this problem, a device has been proposed in which a heating wire is inserted inside a thin tube and the working gas is heated by energizing the heating wire to generate heat (see Japanese Patent Publication No. 244968).

[0005]

[Problems to be solved by the device]

 However, in the above method, the heating wire in the thin tube is energized, so a hole must be formed in the tube wall, and this hole causes gas leakage and deterioration of durability due to stress concentration. There is. In addition, since the thin tube of the heater is generally made of metal, there is a risk of short-circuiting between the thin tube and the heating wire.Furthermore, since there is a heating wire in the thin tube, the flow loss of the working gas in the thin tube increases. Therefore, there is also a problem that the refrigeration efficiency is lowered.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique, to heat the working gas with high efficiency, and to reduce the flow loss of the working gas. To provide a refrigeration system.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a low temperature side cylinder and a high temperature side cylinder, and connects the low temperature chamber of the low temperature side cylinder and the middle greenhouse with a low temperature heat exchanger, and this low temperature heat exchanger is used for indoor heat exchange. In addition to connecting the heat exchanger, the high temperature chamber of the high temperature side cylinder and the middle greenhouse are connected to each other by the outer pipe line and the high temperature heat exchanger, the outdoor heat exchanger is connected to this high temperature heat exchanger, and the working gas is connected to the outer pipe line. In a refrigerating apparatus provided with a heater for heating the, the heater is characterized by including a pair of electrodes capable of conducting electricity to the external conduit itself.

[0008]

[Action]

 According to the present invention, when a current is applied between the pair of electrodes, a current flows through the external conduit itself, and the resistance of the external conduit heats it. According to this, since heat is directly supplied to the working gas flowing in the external pipe, the working gas is efficiently heated.

[0009]

【Example】

 An embodiment of the refrigerating apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 1, the refrigeration system 1 has a high temperature side cylinder 11 in which a working gas is sealed, and a high temperature side displacer 12 is reciprocably mounted in the high temperature side cylinder 11. A high temperature chamber 13 is formed on the front end side of the high temperature side displacer 12, and a middle greenhouse 14 is formed on the rear end side thereof.

A piston rod 42 a is fixed to the rear end of the high temperature side displacer 12, and the piston rod 42 a extends into the machine chamber 41. In the machine chamber 41, the piston rod 42a is connected to a crank mechanism 43 that rotates around a rotary shaft 44. The crank mechanism 43 also includes a piston rod 42b of the low temperature side cylinder 21 in which a working gas is sealed. Are connected.

The piston rod 42 b is fixed to the rear end of the low temperature side displacer 22. The low temperature side displacer 22 is mounted so as to be reciprocally movable, a low greenhouse 23 is formed on the front end side thereof, and a middle greenhouse 24 is formed on the rear end side thereof.

Further, a heating portion 31 for heating the working gas is provided at the tip of the high temperature side cylinder 11. The heating unit 31 is provided with a multi-tubular external pipe 32. One end of the external pipe 32 communicates with the high temperature chamber 13 of the high temperature side cylinder 11, and the other end has a high temperature regenerator 51 and a medium temperature heat exchanger 52. And communicates with the middle greenhouse 14 via the respective. On the other hand, the low temperature chamber 23 of the low temperature side cylinder 21 communicates with the middle greenhouse 24 through the low temperature heat exchanger 55, the low temperature regenerator 56 and the middle temperature heat exchanger 57, and the middle greenhouse 24 communicates through the communication pipe 53. It communicates with the greenhouse 14.

A hot water pipe 62 is connected to each of the medium-temperature heat exchangers 52 and 57, and the hot water pipe 62 is connected to the outdoor heat exchanger 61 via a circulation pump 63. Further, a cold water pipe 72 is connected to the low temperature heat exchanger 55, and the cold water pipe 72 is connected to the indoor heat exchanger 71 via a circulation pump 73.

Therefore, according to this embodiment, the heating portion 31 is provided with the pair of electrodes 33 and 34 capable of energizing the external conduit 32 itself.

One electrode 33 is provided at the tip of the high temperature side cylinder 11, the other electrode 34 is provided near the joint between the external conduit 32 and the high temperature regenerator 51, and the electrodes 33, 34 are Connected to power supply 5. The one electrode 33 has a disc shape, and the other electrode 34 has a ring shape.

When current is applied between the electrodes 33 and 34, a current flows through the entire external conduit 32, and the external conduit 32 itself serves as a resistor, so that the entire external conduit 32 generates heat. According to this, the inner wall of the outer conduit 32 naturally generates heat, so that the working gas flowing therein is efficiently heated.

By the way, since the current flows through the closed loop between the electrodes 33 and 34, the current does not flow to the high temperature regenerator 51 side. However, since an electric current flows toward the outside, the heating case 31 is provided with an insulating case 35 in order to electrically insulate the external conduit 32 and the electrodes 33, 34 from each other.

In order to efficiently heat the external conduit 32, it is desirable to use a heating element having a large resistance in the external conduit 32.

Next, the operation of the refrigeration system will be described.

When the crank mechanism 43 rotates, the high-temperature side displacer 12 and the low-temperature side displacer 22 reciprocate through the piston rods 42a and 42b with their phases shifted. In the course of this reciprocating motion, pressure fluctuation occurs in the enclosed working gas, heat is given to the intermediate temperature heat exchangers 52 and 57 in accordance with this fluctuation, and heat is taken from the low temperature heat exchanger 55. Be seen.

The low temperature heat exchanger 55 of the low temperature side cylinder 21 is connected to the indoor heat exchanger 71, and the intermediate temperature heat exchangers 52 and 57 are connected to the outdoor heat exchanger 61. The heat of the working gas is released indoors, and the heat of the high-temperature working gas is discharged outside the room to perform the cooling operation.

By changing the above combination, it is possible to apply this system to the heating operation.

Therefore, according to this embodiment, the heating means 31 has a feature of heating the working gas, and the power supply 5 energizes the electrodes 33 and 34 to heat the external conduit 32 by resistance heating. When this occurs, the outer pipe 32 itself generates heat, and the working gas is heated by the heat of the inner wall of each outer pipe 32.

According to this, since the heat is directly supplied to the working gas from the inner wall of the outer pipe 32 by resistance-heating each outer pipe 32 of the heating unit 31, the heating wire is not supplied to the inside of the outer pipe 32. Unlike the conventional refrigeration system in which the above-mentioned problem exists, the flow loss of the working gas in the external conduit 32 is small and the operation efficiency is high.

Further, since it is not necessary to provide a hole in the pipe wall of the external pipe line 32 for energization, there is no fear of gas leakage. By appropriately changing the mounting positions of the electrodes 33, 34, the heating portion of the external conduit 32 can be easily changed, so that the temperature distribution of the external conduit 32, which is unavoidable in the heating by the conventional external heating device, cannot be avoided. Uniformity can be corrected, and uniform heating of each external conduit 32 is possible.

By additionally using the heating of the external conduit 32 by the external heating device, it is possible to increase the amount of heat supply to the working gas per unit length of the external conduit 32. Further, since the external conduit 32 and the electrodes 33, 34 are covered with the insulating case 35 and electrically insulated from the outside, no short circuit occurs.

FIG. 2 shows another embodiment.

According to this, the insulating case is not provided in the heating unit 31, and instead, the insulator 36 is provided on the tip of the high temperature side cylinder 11 and the outer surface of the external conduit 32. . This insulator 36 is covered in the range of a closed loop in which a current flows when the electrodes 33 and 34 are energized.

According to this, in addition to the same effect as the above-described embodiment, the mechanical strength of the outer pipeline 32 is secondarily obtained by the amount of the insulator 36 covering the outer surface of the outer pipeline 32. Can be improved.

Incidentally, in order to improve the mechanical strength and the insulating property of the external conduit 32, it is desirable that the external conduit 32 has a laminated structure.

Although the present invention has been described above with reference to an embodiment, it is obvious that the present invention is not limited to this. For example, in the above embodiment, the electrodes 33 and 34 are provided at the tip of the high temperature side cylinder 11 and the external conduit 32, but their positions are such that current can flow through the external conduit 32. For example, one electrode 33 may be provided in the vicinity of the joint position between the external conduit 32 and the high temperature side cylinder 11, and the other electrode 34 may be provided in the vicinity of the joint position between the external conduit 32 and the high temperature regenerator 51. It may be provided in the.

[0033]

[Effect of device]

 As described in detail above, according to the present invention, the resistance gas is applied to each of the external conduits of the heating section to directly supply heat to the working gas from the inner wall of the external conduit. Unlike the conventional refrigeration system where heat rays exist, the flow loss of the working gas in the external pipeline is small and the operating efficiency is extremely high. In addition, since it is not necessary to provide a hole in the pipe wall of the outer pipe line to energize, the durability is high and there is no concern about gas leakage. Furthermore, by appropriately changing the mounting position of the electrodes, it is possible to easily change the heating part of the external conduit, so that the uneven temperature distribution of the external conduit, which was unavoidable in the conventional heating by an external heating device, can be avoided. It can be compensated and uniform heating of each external conduit is possible. Further, by using the heating of the external pipeline by the external heating device in combination, it becomes possible to further increase the heat supply amount to the working gas per unit length of the external pipeline.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a refrigerating apparatus according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment.

[Explanation of symbols]

 1, 2 Refrigerating device 11 High temperature side cylinder 13 High greenhouse 21 Low temperature side cylinder 23 Low greenhouse 31 Heating part 32 External pipeline 33, 34 Electrode 35 Insulation case 36 Insulator 41 Machine room 51 High temperature regenerator 52 Medium temperature heat exchanger 55 Low temperature heat exchanger 56 Low temperature regenerator 57 Medium temperature heat exchanger

Claims (1)

[Scope of utility model registration request] 1. A low temperature side cylinder and a high temperature side cylinder are provided, a low temperature chamber of the low temperature side cylinder and a middle greenhouse are connected by a low temperature heat exchanger, and an indoor heat exchanger is connected to this low temperature heat exchanger, and a high temperature side is connected. The high temperature chamber of the cylinder and the middle greenhouse are connected by an external pipe and a high temperature heat exchanger, an outdoor heat exchanger is connected to this high temperature heat exchanger, and a heater for heating the working gas is connected to the external pipe. In the provided refrigerating apparatus, the heater is provided with a pair of electrodes that can energize the external conduit itself.