Ultralow-temperature gas cooling system

Abstract

The utility model provides an ultra-low temperature gas cooling system, which comprises a first-stage refrigerating loop, a second-stage refrigerating loop and a gas heat exchange loop, in the first-stage refrigerating loop, an outlet pipeline of a first-stage condenser is divided into two lines, refrigerants in the two lines respectively enter a first-stage evaporator and a first-stage gas cooler, and the first-stage evaporator and the second-stage gas cooler are communicated with each other. The air is cooled by a first-stage evaporator and a first-stage gas cooler and then returns to a first-stage compressor of the first-stage refrigerating loop; the second-stage refrigerating circuit is connected with the first-stage refrigerating circuit through the first-stage evaporator and exchanges heat with the first- The gas heat exchange loop is connected with the first-stage refrigerating loop through a first-stage gas cooler and exchanges heat with the first-stage refrigerating loop; and the second-stage refrigeration loop is connected with the gas heat exchange loop through a second-stage evaporator for heat exchange. According to the ultralow-temperature gas cooling system, a sectional cooling mode is adopted, the gas cooling process from the normal temperature to the low temperature is achieved, the operation energy efficiency of the refrigerating system is effectively improved, and the lower gas outlet temperature is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of testing packaging detection equipment, in particular to an ultra-low temperature gas cooling system. Background Art

[0002] The research and development and production of high-performance chips require the support of various technologies and equipment. There are many new technical requirements that need to be developed by our equipment manufacturers, which poses a higher challenge to equipment manufacturers. The temperature test range of chips has also expanded from the original normal high temperature to low and high temperatures. For normal and high temperature detection equipment, it is only necessary to control the output power of the heater to control the temperature. However, for test equipment with both low and high temperatures, temperature control will be much more complicated. The temperature control method for high and low temperature test equipment is an issue worthy of study. High and low temperature test equipment uses heaters for heating at high temperatures and low temperature refrigerants for cooling at low temperatures. The existing technology uses low temperature refrigerants for continuous cooling, uses heating to balance the cooling capacity, and adjusts the heater power to achieve temperature control. This method wastes heating power and consumes high energy. In addition, the long-term high-power operation of the heater seriously affects its lifespan. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the above-mentioned prior art and provide an ultra-low temperature gas cooling system to improve the operating energy efficiency of the refrigeration system and achieve a lower gas outlet temperature.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] A super-low temperature gas cooling system comprises a primary refrigeration circuit, a secondary refrigeration circuit and a gas heat exchange circuit, wherein, in the primary refrigeration circuit, the outlet pipeline of the primary condenser thereof branches into two lines, the refrigerant in the two lines respectively enters the primary evaporator and the primary gas cooler, and returns to the primary compressor of the primary refrigeration circuit after being cooled by the primary evaporator and the primary gas cooler; the secondary refrigeration circuit is connected to the primary refrigeration circuit through the primary evaporator and exchanges heat; the gas heat exchange circuit is connected to the primary refrigeration circuit through the primary gas cooler and exchanges heat; the secondary refrigeration circuit is connected to the gas heat exchange circuit through the secondary evaporator and exchanges heat.

[0006] Furthermore, the primary refrigeration circuit includes the primary compressor, the primary oil separator, the primary filter drier and the primary condenser connected in sequence, and the outlet pipeline of the primary filter drier is divided into two lines. The refrigerant in the two lines enters the primary evaporator and the primary gas cooler respectively, and returns to the primary compressor of the primary refrigeration circuit after condensation by the primary evaporator and pre-cooling by the primary gas cooler.

[0007] Furthermore, two lines branching from the outlet pipeline of the first-stage condenser are each provided with a first-stage throttle valve.

[0008] Furthermore, the secondary refrigeration circuit includes a secondary compressor, a secondary oil separator, a primary evaporator, a secondary drying filter, a secondary throttle valve and a secondary evaporator connected in sequence.

[0009] Furthermore, the gas heat exchange circuit includes the primary gas cooler and the secondary evaporator, the primary gas cooler is provided with a gas inlet, and the secondary evaporator is provided with a gas outlet; an air intake pressure regulating valve is provided on the pipeline of the gas inlet.

[0010] Furthermore, the refrigerant in the primary refrigeration circuit is R404A; the refrigerant in the secondary refrigeration circuit is R23.

[0011] Furthermore, the first-stage compressor is a piston compressor or a scroll compressor; the first-stage condenser is an air-cooled condenser; the first-stage condenser adopts a fin-type heat exchanger; the first-stage evaporator adopts a plate heat exchanger; and the first-stage gas cooler adopts a shell and tube heat exchanger or a plate heat exchanger.

[0012] Furthermore, the two-stage compressor is a piston compressor.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The ultra-low-temperature gas cooling system provided by this utility model adds a gas cooling evaporator to a two-stage cascade refrigeration system. While the primary refrigeration system completes condensation in the secondary refrigeration system, it also adds a gas cooling process. The gas is first cooled to the first stage temperature by the primary refrigeration system before entering the secondary evaporator for final cooling to the low temperature. This staged cooling method achieves a step-by-step cooling process from ambient temperature to low temperature, effectively improving the refrigeration system's operating energy efficiency and achieving a lower gas outlet temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of an ultra-low temperature gas cooling system according to the present invention;

[0017] Figure 2 This is a schematic diagram of the overall structure of an ultra-low temperature gas cooling system according to the present invention;

[0018] Figure 3 This is a heat exchange process curve between gas and refrigerant in an ultra-low temperature gas cooling system described in the utility model.

[0019] Description of reference numerals:

[0020] 1-First stage compressor; 2-First stage oil separator; 3-First stage condenser; 4-First stage drier filter; 5-First stage gas cooler; 6-Second stage drier filter; 7-First stage evaporator; 8-Second stage evaporator; 9-Second stage oil separator; 10-Second stage compressor; 101-Inlet pressure regulating valve; 102-First stage throttle valve; 103-Second stage throttle valve. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments:

[0025] This embodiment describes the present invention by taking the primary refrigeration circuit R404A cascaded with the secondary refrigeration circuit R23. The overall system flow chart is shown in the attached figure. Figure 1-Attached Figure 3 .

[0026] In the cooling system, the object to be cooled may be air or other gases with a liquefaction temperature lower than -70° C. This embodiment is described using air as an example.

[0027] The primary refrigeration circuit includes: a primary compressor 1, a primary oil separator 2, a primary condenser 3, a primary drying filter 4, a primary throttle valve 102, a primary evaporator 7, and a primary gas cooler 5.

[0028] The primary refrigeration circuit's primary compressor 1 is a piston compressor or scroll compressor, the primary condenser 3 is an air-cooled condenser, and furthermore, a finned heat exchanger is used. The primary evaporator 7 is a plate heat exchanger. The refrigerant in the primary refrigeration circuit is R404A. After compression by the primary compressor 1, the R404A refrigerant's pressure rises to 1.2 MPa, with an exhaust temperature of 90°C. It then enters the primary oil separator 2, where the lubricating oil from the primary compressor 1 is separated and returned to the compressor via the oil return line. The refrigerant then enters the primary condenser 3, where the pressure remains constant at 1.2 MPa, while the temperature drops to room temperature (25°C), condensing into liquid refrigerant. The liquid refrigerant then passes through the primary filter drier 4 and enters the primary throttle valve 102, which has a throttling effect, reducing the pressure and temperature of the refrigerant from 1.2 MPa to 0.1 MPa, and the corresponding temperature to -25°C. It then enters the primary evaporator 7 and the primary gas cooler 5, respectively. The secondary refrigerant enters the primary evaporator 7, where it condenses to -15°C. The refrigerant then enters the primary gas cooler 5, which cools the ambient air to -15°C, pre-cooling the secondary cooling system. The refrigerant exits the primary evaporator 7 and primary gas cooler 5, returning to the intake port of the primary compressor 1 and entering the compressor, completing the primary refrigeration circuit.

[0029] The secondary refrigeration circuit includes: a secondary compressor 10, a secondary oil separator 9, a secondary condenser, a secondary drying filter 6, a secondary throttle valve 103, and a secondary evaporator 8.

[0030] The secondary compressor 10 of the secondary refrigeration circuit is a piston compressor, and the secondary condenser and primary evaporator 7 are different channels of the same component. The secondary refrigerant is R23. After being compressed by the secondary compressor 10, the R23 refrigerant's pressure rises to 1.5 MPa, with an exhaust temperature of 90°C. It then enters the secondary oil separator 9, where the lubricating oil in the refrigerant is separated and returned to the secondary compressor 10 through the oil return pipe. It then enters the secondary condenser, where it is cooled to -15°C by the primary refrigerant, and then enters the secondary throttle valve 103. After the throttling effect, the liquid entering the secondary throttle valve 103 experiences a pressure drop of 0.1 MPa, and its temperature subsequently drops to -75°C. It then enters the secondary evaporator 8, cooling the air cooled by the primary gas heat exchanger, further cooling the air from -15°C to an ultra-low temperature of -70°C.

[0031] The gas cooling circuit includes an inlet pressure regulating valve 101, a primary gas cooler 5, and a secondary evaporator 8. The inlet pressure regulating valve 101 regulates the pressure or flow of air entering the gas cooling circuit. The primary gas cooler 5 is a heat exchanger in the primary refrigeration circuit used to cool ambient air from ambient temperature to -15°C. The secondary evaporator 8 is a heat exchanger in the secondary refrigeration circuit used to further cool pre-cooled air from -15°C to -70°C.

[0032] In the cooling system provided in this embodiment, the gas at room temperature is cooled in two stages. Compared with directly cooling the gas from room temperature to -70°C using a low-temperature refrigerant at -75°C, the method of the present invention effectively improves the heat exchange efficiency and reduces the energy consumption of the cooling system.

[0033] Note: Unless otherwise specified, the fixed connection methods described in this article adopt existing fixed connection methods such as threaded connection, welding, and bonding.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-low temperature gas cooling system, characterized in that: The invention comprises a primary refrigeration circuit, a secondary refrigeration circuit and a gas heat exchange circuit, wherein, in the primary refrigeration circuit, the outlet pipeline of the primary condenser (3) thereof branches into two lines, and the refrigerant in the two lines respectively enters the primary evaporator (7) and the primary gas cooler (5), and returns to the primary compressor (1) of the primary refrigeration circuit after being cooled by the primary evaporator (7) and the primary gas cooler (5); the secondary refrigeration circuit is connected to the primary refrigeration circuit through the primary evaporator (7) and heat exchange is carried out; the gas heat exchange circuit is connected to the primary refrigeration circuit through the primary gas cooler (5) and heat exchange is carried out; the secondary refrigeration circuit is connected to the gas heat exchange circuit through the secondary evaporator (8) and heat exchange is carried out.

2. The ultra-low temperature gas cooling system according to claim 1, characterized in that: The primary refrigeration circuit comprises the primary compressor (1), the primary oil separator (2), the primary filter drier (4) and the primary condenser (3) connected in sequence, the outlet pipeline of the primary filter drier (4) being divided into two lines, the refrigerant in the two lines respectively entering the primary evaporator (7) and the primary gas cooler (5), and returning to the primary compressor (1) of the primary refrigeration circuit after being condensed by the primary evaporator (7) and pre-cooled by the primary gas cooler (5).

3. The ultra-low temperature gas cooling system according to claim 1, characterized in that: Two lines branched from the outlet pipeline of the first-stage condenser (3) are both provided with a first-stage throttle valve (102).

4. The ultra-low temperature gas cooling system according to claim 1, characterized in that: The secondary refrigeration circuit comprises a secondary compressor (10), a secondary oil separator (9), a primary evaporator (7), a secondary drying filter (6), a secondary throttle valve (103) and a secondary evaporator (8) which are connected in sequence.

5. The ultra-low temperature gas cooling system according to claim 1, characterized in that: The gas heat exchange circuit comprises the primary gas cooler (5) and the secondary evaporator (8); the primary gas cooler (5) is provided with a gas inlet, and the secondary evaporator (8) is provided with a gas outlet; and an air inlet pressure regulating valve (101) is provided on the pipeline of the gas inlet.

6. The ultra-low temperature gas cooling system according to claim 1, characterized in that: The refrigerant in the primary refrigeration circuit is R404A; the refrigerant in the secondary refrigeration circuit is R23.

7. The ultra-low temperature gas cooling system according to claim 1, characterized in that: The first-stage compressor (1) is a piston compressor or a scroll compressor; the first-stage condenser (3) is an air-cooled condenser; the first-stage condenser (3) adopts a fin-type heat exchanger; the first-stage evaporator (7) adopts a plate-type heat exchanger; and the first-stage gas cooler (5) adopts a shell-and-tube heat exchanger or a plate-type heat exchanger.

8. The ultra-low temperature gas cooling system according to claim 4, characterized in that: The two-stage compressor (10) is a piston compressor.

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