Overlapping type freezing-force circulation refrigeration unit

Abstract

A cascade cold dynamic cycle refrigeration apparatus makes up cold energy with a cryogenic liquid refrigerant by boosting with a dual-stage liquid circulating pump. The temperature of the refrigerant is increased via the cold regenerator before it enters the cold consuming apparatus to provide cold and becomes a gaseous refrigerant. The gaseous refrigerant then flows through the expander to expand and generates work by reducing pressure and temperature. The gaseous refrigerant is condensed and returns to the refrigerant tank via the cold regenerator or/and a throttle valve.

Claims

1. A cascade cold dynamic cycle refrigeration apparatus, comprising a first circuit and a second circuit, wherein the first circuit comprises a refrigerant tank, a first liquid circulating pump, a first cold regenerator, a cold consuming apparatus, and expander that is configured to drive a braking equipment connected thereto, a second cold regenerator, and a first throttle valve, wherein the second circuit comprises the refrigerant tank, a second liquid circulating pump, and the second cold regenerator, wherein the first circuit is configured such that during operation a refrigerant in the refrigerant tank flows sequentially from the refrigerant tank, the first liquid circulating pump, the first cold regenerator, the cold consuming apparatus, the expander, the first cold regenerator, the second cold regenerator, the throttle value, and returns to the refrigerant tank, and wherein the second circuit is configured such that during operation the refrigerant in the refrigerant tank flows sequentially from the refrigerant tank, the second liquid circulating pump, the second cold regenerator, and returns to the refrigerant tank.

2. The cascade cold dynamic cycle refrigeration apparatus of claim 1, wherein the refrigerant is a single-component low boiling point refrigerating medium that has a boiling point below 10 C. under a standard condition, or a mixture comprising the refrigerating medium as a main component.

3. The cascade cold dynamic cycle refrigeration apparatus of claim 2, wherein the second circuit further comprises a second throttle valve disposed between the second cold regenerator and the refrigerant tank, and, during operation, the refrigerant form the second cold regenerator is configured to return to the refrigerant tank via the second throttle valve.

4. The cascade cold dynamic cycle refrigeration apparatus of claim 2, wherein the cold consuming apparatus is selected from the group consisting of a refrigerator, an air conditioner, a refrigerating store, and mixtures thereof.

5. The cascade cold dynamic cycle refrigeration apparatus of claim 2, wherein the braking equipment is a fan, a hydraulic pump, a generator, or a gas compressor.

6. The cascade cold dynamic cycle refrigeration apparatus of claim 2, wherein the first cold regenerator and the second cold regenerator are same or different, each is selected from a group consisting of a tube-shell type cold exchanger, a plate-fin cold exchanger, and a micro channel cold exchanger.

7. The cascade cold dynamic cycle refrigeration apparatus of claim 2, wherein the refrigerant tank is thermally insulated.

Description

DESCRIPTION OF FIGURES

(1) To facilitate understanding by technical personnel in the field, the invention is further described in the following in conjunction with figures.

(2) FIG. 1 is a process schematic diagram of a cascade cold dynamic cycle refrigeration apparatus of this invention.

(3) In FIG. 1: 1-refrigerant tank, 2-liquid refrigerant, 3-liquid circulating pump, 3-1-liquid circulating pump, 4-cold regenerator, 4-1-cold regenerator, 5-refrigerant, 6-expander, 7-braking equipment, 8-cold consuming apparatus, 9-throttle valve, 9-1-throttle valve.

EMBODIMENTS

(4) To facilitate understanding by technical personnel in the field, the invention is further described in the following in conjunction with figures.

(5) As shown in FIG. 1, a cold dynamic cycle refrigeration apparatus, with the specific embodiment as follows:

(6) Liquid nitrogen is used as refrigerant.

(7) The liquid refrigerant 2 from refrigerant tank 1, after being boosted via liquid circulating pump 3, flows via cold regenerator 4, cold consuming apparatus 8, and expander 6 to drive the braking equipment 7, the exhaust vapor from expander 6 flows again via cold regenerator 4, cold regenerator 4-1 and throttle valve 9, and returns to the refrigerant tank 1; the liquid refrigerant 2 from refrigerant tank 1, after being boosted by the liquid circulating pump 3-1, flows via the cold regenerator 4-1 and throttle valve 9-1, and returns to the refrigerant tank 1, so as to form the cascade cold dynamic cycle circuit of the refrigerating media.

(8) The said cold consuming apparatus 8 is used as a refrigerating store.

(9) The braking equipment 7 of the said expander 6 is a hydraulic pump, as a booster pump of liquid nitrogen.

(10) The said cold regenerator 4 and cold regenerator 4-1 are plate-fin cold exchanger or micro channel cold exchanger.

(11) The said refrigerant tank 1 is an insulated vacuum container, and pearlite is used as insulation materials.

(12) The equipment and their backup systems, pipes, instruments, valves, cold insulation and bypass facilities with regulation functions not described in this invention shall be configured with mature technologies of generally known traditional refrigerating cycles.

(13) Safety and regulation and control facilities associated with the refrigerating cycle apparatus of this invention are provided, so that the apparatus can operate economically and safely with high thermal efficiency, to achieve the goal of energy conservation, consumption reduction and environmental protection.

(14) This invention has been made public with an optimum embodiment as above, however, it is not used to restrict this invention, all variations or decorations made by those familiar with this technology without deviating from the spirit and scope of this invention also falls into the scope of protection of this invention. Therefore, the scope of protection of this invention shall be that defined by the claims in this application.