CN102147164A

CN102147164A - High-efficiency vas refrigerating machine

Info

Publication number: CN102147164A
Application number: CN 201110127564
Authority: CN
Inventors: 王博; 王龙一; 袁园; 甘智华
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2011-05-17
Filing date: 2011-05-17
Publication date: 2011-08-10

Abstract

The invention discloses a high-efficiency vas refrigerating machine. The high-efficiency vas refrigerating machine comprises a compressor, a transmission tube, a heat regenerator hot end heat exchanger, a heat regenerator, a heat regenerator cold end heat exchanger, a decompression spray pipe, a cold end flow passage, a vas, a vas hot end heat exchanger, an inertia tube and an air reservoir which are connected in sequence. According to the different working temperature zones of the vas refrigerating machine (6K is taken as a limit), a tapered spray pipe (The refrigerating temperature is below 6K) or a gradually-expanding diffuser pipe (The refrigerating temperature is above 6K) is connected between the heat regenerator cold end heat exchanger and the vas to correspondingly reduce or improve the pressure of an expansion gas working medium at a cold end inlet of the vas, thereby increasing the constant-entropy expansion coefficients and finally improving the efficiency of the vas refrigerating machine.

Description

The efficient vascular refrigeration machine

Technical field

The present invention relates to regenerating type low-temperature refrigerator, relate in particular to a kind of efficient vascular refrigeration machine.

Background technology

Low-temperature refrigeration technology has effectively promoted progress of science and technology for a long time, now has been widely used in fields such as military affairs, medical treatment, space flight, superconduction.The mechanical type Cryo Refrigerator is the technology of main flow in the low-temperature refrigeration technology, its refrigeration warm area has been contained all above low temperature warm areas of 4K, at the numerous cryogenic refrigeration machine of kind, vascular refrigerator is not because cold junction has moving component, have simple in structure, advantages such as cost is low, mechanical oscillation are little, the life-span is long have the prospect in field extensive uses such as military affairs, medical treatment, space flight, thereby become the focus of research.But, because series of factors such as the regenerator loss of vascular refrigerator, working medium incomplete expansion cause the efficient of vascular refrigerator still on the low side (the relative Carnot efficiency when 80K is about 10%-20%).

The refrigeration mechanism of mechanical type refrigeration machine comprises two kinds of isenthalpic throttling and constant entropy expansion, and the refrigeration machine mechanism of vascular refrigerator belongs to the latter, and the expansion position of vascular refrigerator is positioned at the vascular cold junction, the constant entropy expansion coefficient

Be to be characterized in the isentropic expansion process, temperature is along with a coefficient of change in pressure, constant entropy expansion coefficient

High more, show more that temperature reduces under the identical pressure drop, what promptly expand is more abundant, and the efficient of refrigeration machine is higher.

Summary of the invention

The objective of the invention is at existing pulse tube refrigeration engine efficiency very lowly, overcome the deficiencies in the prior art, a kind of efficient vascular refrigeration machine is provided.

A kind of efficient vascular refrigeration machine comprises compressor, transfer tube, regenerator hot end heat exchanger, regenerator, regenerator cool end heat exchanger, convergent jet pipe, cold junction runner, vascular, vascular hot-side heat exchanger, inertia tube and the air reservoir that connects in turn.

Another kind of efficient vascular refrigeration machine comprises compressor, transfer tube, regenerator hot end heat exchanger, regenerator, regenerator cool end heat exchanger, cold junction runner, flaring diffuser pipe, vascular, vascular hot-side heat exchanger, inertia tube and the air reservoir that connects in turn.

The present invention is according to under the different temperatures, the constant entropy expansion coefficient

Situation of change research with pressure draws as drawing a conclusion: in warm area greater than about 6K, and the constant entropy expansion coefficient

Increase along with the rising of pressure; And at the warm area less than about 6K, constant entropy expansion coefficient

Reduce along with the increase of pressure.Simultaneously, because the working medium flowing velocity in the refrigeration machine is less than the velocity of sound, according to the character of jet pipe as can be known: when flow velocity during less than local velocity of sound (Mach number is less than 1), the effect that jet pipe and flaring diffuser pipe can be realized step-down and supercharging is respectively reduced in use, promptly can reduce jet pipe or flaring diffuser pipe and realize reducing of vascular inlet pressure or increases by between regenerator cool end heat exchanger and vascular, using according to the difference of the refrigeration warm area of refrigeration machine, thus increase constant entropy expansion coefficient

, reach the purpose that improves refrigeration machine efficient.The specific embodiment is: when cryogenic temperature is higher than 6K, add the flaring diffuser pipe between regenerator cool end heat exchanger and vascular, improve the pressure of vascular import, increase the constant entropy expansion coefficient Thereby, raise the efficiency; When cryogenic temperature during less than 6K, between regenerator cool end heat exchanger and vascular, add the convergent jet pipe, to reduce the pressure of vascular import, increase the constant entropy expansion coefficient Thereby, raise the efficiency.

Description of drawings

Fig. 1 is the efficient vascular refrigeration machine structural representation of band convergent jet pipe;

Fig. 2 is the efficient vascular refrigeration machine structural representation of band flaring diffuser pipe;

Fig. 3 is the schematic diagram of convergent jet pipe of the present invention;

Fig. 4 is the schematic diagram of flaring diffuser pipe of the present invention;

Among the figure: compressor 1, transfer tube 2, regenerator hot end heat exchanger 3, regenerator 4, regenerator cool end heat exchanger 5, convergent jet pipe 6, cold junction runner 7, vascular 8, vascular hot-side heat exchanger 9, inertia tube 10 and air reservoir 11, flaring diffuser pipe 12.

The specific embodiment

The present invention by add convergent jet pipe or flaring diffuser pipe jet pipe between regenerator cool end heat exchanger and vascular, regulates the pressure of vascular porch, thereby increases the constant entropy expansion coefficient according to the difference of cryogenic temperature , make expansion more abundant, realize improving the purpose of pulse tube refrigeration engine efficiency.

As shown in Figure 1, use the efficient vascular refrigeration machine that is operated in the following band jet pipe of 6K warm area of convergent jet pipe to comprise compressor 1, transfer tube 2, regenerator hot end heat exchanger 3, regenerator 4, regenerator cool end heat exchanger 5, convergent jet pipe 6, cold junction runner 7, vascular 8, vascular hot-side heat exchanger 9, inertia tube 10 and the air reservoir 11 that connects in turn.

As shown in Figure 2, use the above efficient vascular refrigeration machine of 6K warm area that is operated in of flaring diffuser pipe to comprise compressor 1, transfer tube 2, regenerator hot end heat exchanger 3, regenerator 4, regenerator cool end heat exchanger 5, flaring diffuser pipe jet pipe 12, cold junction runner 7, vascular 8, vascular hot-side heat exchanger 9, inertia tube 10 and the air reservoir 11 that connects in turn.

The structure chart of convergent jet pipe 6 as shown in Figure 3, the direction of arrow is represented fluid flow direction among the figure.

The structure of flaring diffuser pipe 12 as shown in Figure 4, the direction of arrow is represented fluid flow direction among the figure.

Claims

1. an efficient vascular refrigeration machine is characterized in that comprising the compressor (1), transfer tube (2), regenerator hot end heat exchanger (3), regenerator (4), regenerator cool end heat exchanger (5), convergent jet pipe (6), cold junction runner (7), vascular (8), vascular hot-side heat exchanger (9), inertia tube (10) and the air reservoir (11) that connect in turn.

2. an efficient vascular refrigeration machine is characterized in that comprising the compressor (1), transfer tube (2), regenerator hot end heat exchanger (3), regenerator (4), regenerator cool end heat exchanger (5), cold junction runner (7), flaring diffuser pipe (12), vascular (8), vascular hot-side heat exchanger (9), inertia tube (10) and the air reservoir (11) that connect in turn.