CN211372811U

CN211372811U - High-low temperature test device

Info

Publication number: CN211372811U
Application number: CN201922267551.5U
Authority: CN
Inventors: 李永丰
Original assignee: Guangzhou Shipac Environmental Equipment Co ltd
Current assignee: Guangzhou Shipac Environmental Equipment Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-28
Anticipated expiration: 2029-12-17

Abstract

A high-low temperature test device comprises a first-stage refrigeration system, a condensing evaporator CC and a second-stage refrigeration system; the first stage refrigeration system includes a first stage compressor MC1, an air cooled condenser CA, a dry filter RFD1, and an evaporator E1, and the second stage refrigeration system includes a second stage compressor MC2, a precooler HEX1, an oil separator OS, a dry filter RFD2, an evaporator E2, a discharge pressure regulator DRV, and an expansion vessel ET. When the environment test below 0 degree is needed, the temperature is controlled by the double refrigeration systems, and when the environment test above 0 degree is needed, the temperature is controlled by the primary refrigeration system, so that the refrigeration system is more intelligent and the power consumption is less.

Description

High-low temperature test device

Technical Field

The utility model relates to a simulation environmental test device, especially a high low temperature test box.

Background

The high-low temperature test chamber can be divided into an alternating test and a constant temperature test according to a test method and an industrial standard, the two test methods are upgraded and expanded on the basis of the high-low temperature test chamber, the alternating test chamber can set the time of high temperature, low temperature and temperature required to be done in an instrument parameter at one time, the test chamber can move according to a set program, the high-low temperature test chamber is just at a fixed temperature, the test effect is closer to the natural climate, and more severe natural climate is simulated, so that the reliability of a tested sample is higher. For example, a high-low temperature test device with a more stable working condition of a refrigeration system, which is disclosed as Chinese patent publication No. CN206103946U, comprises a first-stage refrigeration system, a condensing evaporator CC and a second-stage refrigeration system; the first-stage refrigeration system comprises a first-stage compressor MC1, an air-cooled condenser CA, a drying filter RFD1 and a solenoid valve YV3, the output end of a first-stage compressor MC1 is connected with the input end of the air-cooled condenser CA, the output end of the air-cooled condenser CA is connected with the input end of a drying filter RFD1, the output end of the drying filter RFD1 is divided into two paths, one path of the two paths; the second stage refrigeration system comprises a second stage compressor MC2, a precooler HEX1, an oil separator OS, a dry filter RFD2, an evaporator E, a discharge pressure regulator DRV, and an expansion vessel ET; the output end of the second-stage compressor MC2 is connected with the input end of a precooler pre-HEX 1, the input end of a precooler pre-HEX 1 is connected with the input end of the second-stage compressor MC2 through an oil separator OS, the output end of the precooler pre-HEX 1 is connected with the input end of a dry filter RFD2 after passing through a condensation evaporator CC, the output end of the dry filter RFD2 is divided into two paths, one path transmits cold energy to a test area in the test box through an evaporator E after passing through a capillary tube CT8, and the other path is connected with the air return end of the second-stage compressor MC2 after being controlled by an electromagnetic valve YV7 and a capillary tube CT 7. This kind of second grade refrigerating system though can reach great compression ratio, is difficult to arouse the super high temperature superpressure, and system operating mode operates steadily, but to the accuse temperature more than 0, should need not to adopt second grade refrigerating system, and prior art's second grade refrigerating system is undoubtedly more power consumption.

Disclosure of Invention

The utility model aims to solve the technical problem that a high low temperature test device is provided, refrigerating system operating condition is more steady, and whole power consumption is littleer.

In order to solve the technical problem, the technical scheme of the utility model is that: a high-low temperature test device comprises a first-stage refrigeration system, a condensing evaporator CC and a second-stage refrigeration system;

the first-stage refrigeration system comprises a first-stage compressor MC1, an air-cooled condenser CA, a drying filter RFD1 and an evaporator E1, wherein the output end of the first-stage compressor MC1 is connected with the input end of the air-cooled condenser CA, and the output end of the air-cooled condenser CA is connected with the input end of the drying filter RFD 1; the output end of the drying filter RFD1 is divided into three paths: the first path is connected with the air return end of the first-stage compressor MC1 after passing through an electromagnetic valve YV1 and a capillary tube CT1, and the second path is connected with the input end of the first-stage compressor MC1 after passing through an electromagnetic valve YV2, a capillary tube CT2 and a condensation evaporator CC; the third path passes through an electromagnetic valve YV3, a capillary tube CT3 and an evaporator E1 and then is connected with the input end of a first-stage compressor MC 1;

the second stage refrigeration system comprises a second stage compressor MC2, a precooler HEX1, an oil separator OS, a dry filter RFD2, an evaporator E2, a discharge pressure regulator DRV, and an expansion vessel ET; the output end of the second-stage compressor MC2 is connected with the input end of a precooler HEX1, the refrigerant coming out of the precooler HEX1 through an oil separator OS is divided into two paths, wherein one path flows into a condensation evaporator CC, and the other path is controlled to enter an expansion container ET through a discharge pressure regulating valve DRV; the output end of the condensing evaporator CC is connected with the input end of a drying filter RFD2, the output end of the drying filter RFD2 is divided into two paths, one path transmits cold energy to a test area in the test box through an evaporator E2 by a capillary tube CT5, and the other path is controlled by a solenoid valve YV4 and a capillary tube CT4 to be connected with the air return end of a second-stage compressor MC 2.

As a modification, in the second stage refrigeration system, the evaporator E is in heat exchange relationship with a heat exchanger HEX 2.

Compared with the prior art, the utility model the beneficial effect who brings is:

the refrigerant liquid which is changed into low pressure and low temperature through the capillary tube directly returns to the air return end of the compressor, and the effect of the cold compressor head is achieved; the refrigerant from the oil separator OS flows into the condensing evaporator CC in one path, and the refrigerant in the other path is controlled to enter the expansion container ET through the exhaust pressure regulating valve DRV to play a role in balancing the system pressure; when the system is in a rapid cooling stage, the excessive cold quantity can cause the cold quantity of the system to be out of control, a part of cold quantity is balanced through the heat exchanger HEX2, the load of the compressor is reduced, and the operation condition of the refrigeration system is more stable; when the environment test below 0 degree is needed, the temperature is controlled by the double refrigeration systems, and when the environment test above 0 degree is needed, the temperature is controlled by the primary refrigeration system, so that the refrigeration system is more intelligent and the power consumption is less.

Drawings

Fig. 1 is a piping diagram of the system of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The utility model provides a high low temperature test device that refrigerating system operating mode is more stable, includes first order refrigerating system, condensation evaporimeter CC and second grade refrigerating system. The condenser-evaporator CC is located in the middle, the first-stage refrigeration system is located on the right side of the condenser-evaporator CC, and the second-stage refrigeration system is located on the left side of the condenser-evaporator CC. The high-low temperature test device further comprises a machine body, the test box is located at the upper portion in the machine body, and the refrigerating system formed by the first-stage refrigerating system, the condensing evaporator CC and the second-stage refrigerating system is located below the test box.

As shown in fig. 1, the first stage refrigeration system includes a first stage compressor MC1, an air-cooled condenser CA, a dry filter RFD1 and an evaporator E1, an output end of the first stage compressor MC1 is connected with an input end of the air-cooled condenser CA, and an output end of the air-cooled condenser CA is connected with an input end of the dry filter RFD 1; the output end of the drying filter RFD1 is divided into three paths: the first path is connected with the air return end of the first-stage compressor MC1 after passing through an electromagnetic valve YV1 and a capillary tube CT1, and the second path is connected with the input end of the first-stage compressor MC1 after passing through an electromagnetic valve YV2, a capillary tube CT2 and a condensation evaporator CC; the third path passes through an electromagnetic valve YV3, a capillary tube CT3 and an evaporator E1 and then is connected with the input end of a first-stage compressor MC 1.

As shown in fig. 1, the second stage refrigeration system includes a second stage compressor MC2, a precooler HEX1, an oil separator OS, a desiccant filter RFD2, an evaporator E2, a discharge pressure regulator DRV, and an expansion vessel ET; the output end of the second-stage compressor MC2 is connected with the input end of a precooler HEX1, the refrigerant coming out of the precooler HEX1 through an oil separator OS is divided into two paths, wherein one path flows into a condensation evaporator CC, and the other path is controlled to enter an expansion container ET through a discharge pressure regulating valve DRV; the output end of the condensing evaporator CC is connected with the input end of a drying filter RFD2, the output end of the drying filter RFD2 is divided into two paths, one path transmits cold energy to a test area in the test box through an evaporator E2 by a capillary tube CT5, and the other path is controlled by a solenoid valve YV4 and a capillary tube CT4 to be connected with the air return end of a second-stage compressor MC 2. One path of the refrigerant from the oil separator OS flows into the condensing evaporator CC, and the other path of the refrigerant is controlled to enter the expansion container ET through the exhaust pressure regulating valve DRV, so that the effect of balancing the system pressure is achieved. In the second stage refrigeration system, evaporator E2 is in heat exchange relationship with heat exchanger HEX 2. When the heat in the test chamber is large, the temperature of the refrigerant flowing through the evaporator is high, if the refrigerant does not pass through the heat exchanger HEX2, the heat directly flows back to the compressor to cause the pressure of the compressor to increase, the current to rise, and the compressor is easy to overheat, burn out or reduce the service life when the refrigerant is in the state for a long time; when the system is in a rapid cooling stage, the excessive cold energy can cause the cold energy of the system to be out of control, a part of cold energy is balanced through the heat exchanger HEX2, the load of the compressor is reduced, and the operation condition of the refrigeration system is more stable.

The utility model discloses the theory of operation: when the environment test below 0 ℃ is required, a double-refrigeration system is adopted for controlling the temperature; when the environment test is carried out at the temperature of more than 0 degree, the temperature is controlled by adopting a primary refrigerating system, so that the refrigerating system is more intelligent and the power consumption is less.

Temperature control principle of the first-stage refrigeration system: the electromagnetic valve YV2 is closed, the refrigerant in the refrigeration system is cut off from flowing to the condensing evaporator CC, the electromagnetic valve YV1 and the electromagnetic valve YV3 are opened, and the temperature control of the environment above 0 ℃ is realized by utilizing the evaporator E1.

The temperature control principle of the two-stage refrigeration system is as follows: the high-temperature and high-pressure refrigerant gas from the first-stage compressor MC1 flows through the air-cooled condenser CA, is converted into high-pressure refrigerant liquid after being subjected to heat exchange and temperature reduction through the condenser, then flows through the drying filter RFD1, absorbs impurities such as filtered water vapor, copper burrs and the like, flows through the capillary tube CT1 and the CT2 for interception, is converted into low-pressure and low-temperature refrigerant liquid, the cold energy of the path flowing through the capillary tube CT2 is transmitted to the second-stage refrigeration system through the condensing evaporator CC, and the path flowing through the capillary tube CT1 is directly returned to the air return end of the first-stage compressor MC1 after being controlled by the electromagnetic valve YV1, so that the cold compressor. High-temperature and high-pressure refrigerant gas which is discharged from a second-stage compressor MC2 is precooled by a precooler HEX1, then enters an oil separator OS, and separates out refrigerant oil mixed in the refrigerant, flows back to the second-stage compressor MC2, the refrigerant discharged from the precooler HEX1 enters a condensation evaporator CC, is specially reduced into low-temperature liquid through first-stage cold energy, is converted into high-pressure refrigerant liquid, flows through a drying filter RFD2, absorbs impurities such as filtered water vapor, copper burrs and the like, flows through a capillary tube CT4 and a capillary tube CT5 for interception, is converted into low-pressure and low-temperature refrigerant liquid, the path flowing through the capillary tube CT5 transfers the cold energy to an internal test area of a test box through the evaporator E2, and the path flowing through the capillary tube CT4 directly returns to an air return end of the second-stage compressor MC2 after being controlled by an electromagnetic valve YV4, and plays a.

Claims

1. A high and low temperature test device is characterized in that: the system comprises a first-stage refrigeration system, a condensing evaporator CC and a second-stage refrigeration system;

2. A high and low temperature test apparatus according to claim 1, wherein: in the second stage refrigeration system, evaporator E is in heat exchange relationship with heat exchanger HEX 2.