CN201083750Y - Compressor cooling and liquid nitrogen mixed cooling low-temperature test box structure - Google Patents

Abstract

The utility model relates to a compressor cooling and liquid nitrogen mixed cooling low temperature test box structure. The utility model provides a simple structure is compact, good reliability, practical effectual compressor cooling and liquid nitrogen mixed cooling combined type low temperature test case reach the target refrigeration temperature fast. The utility model comprises an evaporator, a liquid nitrogen cooling system is composed of a liquid nitrogen refrigerant source, a liquid nitrogen inlet and a nitrogen outlet pipeline, and the evaporator is provided with the liquid nitrogen inlet and the matched nitrogen outlet pipeline; the compressor cooling system adopts a primary refrigeration system and a secondary refrigeration system in a repeated refrigeration mode, and the evaporator is provided with a refrigeration inlet pipeline and a matched refrigeration outlet pipeline of the secondary refrigeration system. The utility model discloses a compressor refrigeration and liquid nitrogen refrigeration are two mutually independent structures, are only in the evaporimeter place to the test box combined action and increase cooling effect, good reliability, and the security performance is stable.

Description

Compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure

technical field

The utility model relates to a low-temperature test box, in particular to a structure of a low-temperature test box with two-stage refrigeration combined with liquid nitrogen mixed cooling.

Background technique

In order to test the low temperature physical properties of the product, the product and components are exposed to different temperature characteristics at different low temperatures, so as to determine the applicable field and environment of the product. At present, it takes several hours to test the low-temperature physical properties of the test box to reach -70°C. It takes a long time to refrigerate, wastes energy, is inconvenient to operate, and takes a long time to test the product.

Contents of the invention

Aiming at the defects existing in the prior art, the main purpose of this utility model is to solve the technical problem of providing a simple and compact structure, good reliability, practical and effective compressor cooling and liquid nitrogen mixed cooling composite cryogenic test box, which adopts two-stage Refrigeration is combined with liquid nitrogen to refrigerate the test chamber to enhance refrigeration stability and quickly reach the target refrigeration temperature.

In order to achieve the above purpose, the structure of the low temperature test box for compressor cooling and liquid nitrogen mixed cooling of the utility model adopts the following technical solutions:

A compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure, including an evaporator, the evaporator is located in the test box, it is composed of two parts: a liquid nitrogen cooling system and a compressor cooling system:

The liquid nitrogen cooling system consists of a liquid nitrogen refrigerant source, a liquid nitrogen inlet, and a nitrogen outlet pipeline. The evaporator (set in the test box) is equipped with a liquid nitrogen inlet and a matching nitrogen outlet pipeline;

The compressor cooling system adopts a cascade refrigeration system with a primary refrigeration system and a secondary refrigeration system. The evaporator is equipped with a refrigeration inlet pipeline of the secondary refrigeration system and a matching refrigeration outlet pipeline.

Further, the primary refrigeration system is sequentially connected into a circulation body by a primary refrigeration compressor, a primary refrigeration circuit oil separator, a condenser, a filter, an expansion valve, and an exchanger, and at the same time, the secondary refrigeration system is provided by the exchanger. cooling refrigerant;

Further, the secondary refrigeration system is sequentially connected into a circulation body by secondary refrigeration compressors, secondary refrigeration circuit oil separators, exchangers, solenoid valves, and evaporators;

The refrigerant from the above-mentioned exchanger directly enters the evaporator through the capillary tube and the refrigeration inlet pipe;

The refrigerant from the above-mentioned exchanger enters the evaporator through the capillary, solenoid valve, and refrigeration inlet pipeline;

The refrigerant coming out of the above-mentioned exchanger returns to the secondary refrigeration compressor through the capillary tube, the solenoid valve, and the refrigeration outlet pipeline in sequence.

The utility model can quickly reach the temperature required by the tester. The compressor refrigeration and the liquid nitrogen refrigeration are two mutually independent structures. They only work together on the test box at the evaporator to increase the cooling effect, ensuring that the temperature can be reached within 30 minutes. -70°C, its reasonable control method and automatic detection device make the detection range of the low temperature test box more extensive and accurate, with good reliability and stable safety performance.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a structural block diagram of the refrigeration system of the utility model embodiment;

Fig. 3 is a three-dimensional appearance view of the embodiment of the utility model.

Detailed ways

In order to further understand the features, technical means, and achieved specific objectives and effects of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings, preferred embodiments and drawings.

The relevant structure described in the utility model mainly includes the following components (or devices): liquid nitrogen inlet 1, nitrogen outlet 2, refrigeration inlet pipeline 3, refrigeration outlet pipeline 4, secondary refrigeration return compressor pipeline 5, solenoid valve 6. Secondary refrigeration compressor 7, capillary tube 8, condenser 9, evaporator 10, exchanger 11, secondary refrigeration circuit oil separator 12, primary refrigeration circuit oil separator 13.

Please refer to accompanying drawings 1, 2, and 3, the structure of the low-temperature test box for compressor cooling and liquid nitrogen mixed cooling of the utility model includes:

Evaporator 10, the evaporator 10 is set in the test box, it is composed of liquid nitrogen cooling system and compressor cooling system: the liquid nitrogen cooling system is composed of liquid nitrogen refrigerant source, liquid nitrogen inlet 1, nitrogen outlet 2 pipelines, The evaporator 10 is provided with a liquid nitrogen inlet 1 and a matching nitrogen outlet 2 pipeline; the compressor cooling system adopts a cascade refrigeration system with a primary refrigeration system and a secondary refrigeration system, and the evaporator 10 is provided with a secondary refrigeration system The refrigeration inlet pipeline 3 and the matching refrigeration outlet pipeline 4.

The primary refrigeration system consists of primary refrigeration compressors, primary refrigeration circuit oil separators 13, condensers 9, filters, expansion valves and exchangers 11, which are sequentially connected to form a circulation body, and at the same time provide the secondary refrigeration system through the exchanger 11. Cooling refrigerant.

The secondary refrigeration system is composed of secondary refrigeration compressor 7, secondary refrigeration circuit oil separator 12, exchanger 11, solenoid valve 6, and evaporator 10 to form a circulation body in sequence. Most of the refrigerant coming out of the exchanger 11 directly enters the evaporator 10 (set in the test box) through the capillary 8 and the refrigeration inlet line 3, and the evaporator 19 is arranged in the test box to cool the temperature of the test box.

The refrigerant from the exchanger 11 enters the evaporator 10 through a capillary 8, solenoid valve 6, and refrigeration inlet pipeline 3; stage refrigeration compressor 7, the main function of this part is to be used for cooling secondary refrigeration compressor 7.

The utility model adopts two-stage refrigeration combined with liquid nitrogen to refrigerate the inside of the test box (including the evaporator 10) to reach the temperature required by the tester, ensuring that it can reach -70°C within 30 minutes. The compressor refrigeration and the liquid nitrogen refrigeration are two mutually independent structures, and only the evaporator 10 acts together on the test box to increase the cooling effect.

In the refrigeration part of the compressor, the first-stage refrigeration exchanges heat with the refrigerant of the second-stage refrigeration inside the exchanger. After the first-stage refrigeration, in order to achieve a better refrigeration effect, the second-stage refrigeration must pass through the exchanger on the basis of the first-stage refrigeration. Cool the refrigerant.

To sum up, the utility model has been produced as a sample according to the content of the patent specification and drawings, and has been tested for many times, which proves that it can achieve its expected purpose and effect, and its practical effect is beyond doubt. The preferred embodiments of the utility model mentioned above are only used to illustrate the utility model for convenience, and should not limit the scope of implementation of the utility model. Within the scope of the mentioned technical features, the equivalent embodiments of local changes, equal changes or modifications made by using the technical content disclosed in the utility model, and without departing from the technical features of the utility model, should still belong to the utility model within the scope of the patent.

Claims (6)

1. A compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure, comprising: evaporator (10), the evaporator (10) is located in the test box, is characterized in that it is composed of liquid nitrogen cooling system and compressor The cooling system consists of two parts: The liquid nitrogen cooling system is composed of a liquid nitrogen refrigerant source, a liquid nitrogen inlet (1), and a nitrogen outlet (2) pipeline. The evaporator (10) is provided with a liquid nitrogen inlet (1) and a matching nitrogen outlet (2) piping; The compressor cooling system adopts the primary refrigeration system and the secondary refrigeration system of the cascading refrigeration method, and the evaporator (10) is provided with the refrigeration inlet pipeline (3) of the secondary refrigeration system and the matching refrigeration outlet pipeline (4 ). 2. The compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure according to claim 1, characterized in that: the primary refrigeration system consists of a primary refrigeration compressor, a primary refrigeration circuit oil separator (13), The condenser (9), the filter, the expansion valve and the exchanger (11) are sequentially connected to form a circulation body, and at the same time, the exchanger (11) provides cooling refrigerant to the secondary refrigeration system. 3. The compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure according to claim 1, characterized in that: the secondary refrigeration system consists of a secondary refrigeration compressor (7), a secondary refrigeration circuit oil separator ( 12), the exchanger (11), the solenoid valve (6), and the evaporator (10) are sequentially connected to form a circulation body. 4. The compressor cooling and liquid nitrogen mixed cooling cryogenic test chamber structure according to claim 3, characterized in that: the refrigerant from the exchanger (11) directly passes through the capillary (8) and the refrigeration inlet pipeline (3) Enters the evaporator (10). 5. The structure of compressor cooling and liquid nitrogen mixed cooling cryogenic test chamber according to claim 3, characterized in that: the refrigerant from the exchanger (11) passes through the capillary (8), solenoid valve (6), refrigeration The inlet line (3) enters the evaporator (10). 6. The compressor cooling and liquid nitrogen mixed cooling cryogenic test box structure according to claim 3, characterized in that: the refrigerant from the exchanger (11) passes through the capillary (8), the solenoid valve (6), and the cooling outlet The line (4) returns to the secondary refrigeration compressor (7).

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