CN-119597051-B - Linear cooling control method of environment test box and environment test box

CN119597051BCN 119597051 BCN119597051 BCN 119597051BCN-119597051-B

Abstract

The invention discloses a linear cooling control method of an environment test box and the environment test box. The method comprises the steps of obtaining the temperature in a box of an environment test box to be controlled, the suction pressure of the variable frequency compressor and the exhaust pressure of the variable frequency compressor, calculating the linear cooling rate of the environment test box to be controlled based on preset temperature parameters, obtaining a database according to the temperature in the box, the suction pressure of the variable frequency compressor, the exhaust pressure of the variable frequency compressor and the linear cooling rate, respectively calculating the target rotating speed of the variable frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan of the environment test box to be controlled based on the database, and respectively controlling the variable frequency compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the environment test box to be controlled based on the calculated target rotating speed of the variable frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan to be controlled so as to realize the linear cooling control of the environment test box to be controlled.

Inventors

SHI JIANWEI

Assignees

江苏拓米洛高端装备股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241129

Claims (6)

1. The linear cooling control method for the environmental test chamber is characterized by comprising the following steps of: Acquiring the temperature in the environment to be controlled test box, the suction pressure of the variable frequency compressor and the exhaust pressure of the variable frequency compressor; Calculating the linear cooling rate of the environment to be controlled test box based on preset temperature parameters; Obtaining a database according to the temperature in the box, the suction pressure of the variable-frequency compressor, the exhaust pressure of the variable-frequency compressor and the linear cooling rate, and respectively calculating the target rotating speed of the variable-frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan of the environment to be controlled test box based on the database; Controlling the variable-frequency compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the environment test box to be controlled to act respectively based on the calculated target rotating speed of the variable-frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan so as to realize the linear cooling control of the environment test box to be controlled; The method comprises the steps of obtaining a database according to the temperature in the box, the suction pressure of the variable frequency compressor, the exhaust pressure of the variable frequency compressor and the linear cooling rate, and respectively calculating the target rotating speed of the variable frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan of the environment test box to be controlled based on the database, wherein the steps comprise: Obtaining a first database according to the temperature in the box and the linear cooling rate; determining the initial rotating speed of the variable frequency compressor according to the first database; obtaining a second database according to the suction pressure of the variable frequency compressor and the discharge pressure of the variable frequency compressor; determining the corrected rotating speed of the variable frequency compressor according to the second database; Calculating the target rotating speed of the variable frequency compressor of the environment test box to be controlled according to the initial rotating speed of the variable frequency compressor and the corrected rotating speed of the variable frequency compressor; Obtaining a third database according to the target rotating speed of the variable frequency compressor and the linear cooling rate; determining the initial opening of the electronic expansion valve according to the third database; obtaining a fourth database according to the temperature in the box and the compression ratio of the variable frequency compressor obtained through calculation through the suction pressure of the variable frequency compressor and the discharge pressure of the variable frequency compressor; determining the corrected opening of the electronic expansion valve according to the fourth database; Calculating the target opening of the electronic expansion valve according to the initial opening of the electronic expansion valve and the corrected opening of the electronic expansion valve; Obtaining a fifth database according to the target opening of the electronic expansion valve and the target rotating speed of the variable frequency compressor; determining the initial rotating speed of the evaporator fan according to the fifth database; Obtaining a sixth database according to the temperature in the box and the suction pressure of the variable frequency compressor; determining the corrected rotating speed of the evaporator fan according to the sixth database; calculating the target rotating speed of the evaporator fan according to the initial rotating speed of the evaporator fan and the corrected rotating speed of the evaporator fan; Obtaining a seventh database according to the target rotating speed of the variable frequency compressor and the exhaust pressure of the variable frequency compressor; and determining the target rotating speed of the condenser fan according to the seventh database.
2. The linear cooling control method according to claim 1, wherein calculating the variable frequency compressor target rotation speed of the environmental test chamber to be controlled from the variable frequency compressor initial rotation speed and the variable frequency compressor corrected rotation speed comprises: And determining the sum of the initial rotating speed of the variable frequency compressor and the corrected rotating speed of the variable frequency compressor as the target rotating speed of the variable frequency compressor of the environment test box to be controlled.
3. The linear cooling control method according to claim 1, wherein the calculating the electronic expansion valve target opening according to the electronic expansion valve initial opening and the electronic expansion valve corrected opening includes: and determining the sum of the initial opening of the electronic expansion valve and the corrected opening of the electronic expansion valve as the target opening of the electronic expansion valve.
4. The linear cooling control method according to claim 1, wherein calculating the evaporator fan target rotation speed from the evaporator fan initial rotation speed and the evaporator fan corrected rotation speed comprises: And determining the sum value of the initial rotation speed of the evaporator fan and the corrected rotation speed of the evaporator fan as the target rotation speed of the evaporator fan.
5. An environmental test chamber, characterized in that the environmental test chamber comprises a chamber body, a control system and a refrigerating system, wherein the control system executes the linear cooling control method of the environmental test chamber according to any one of the claims 1-4; the control system comprises a display unit, a sensor unit and a control unit, wherein the sensor unit is arranged in the box body, the display unit is arranged on the surface of the box body, the control unit is arranged in or outside the box body, and the display unit and the sensor unit are respectively and electrically connected with the control unit; The refrigerating system is arranged in the box body and comprises a variable-frequency compressor, a condenser fan, an evaporator fan and an electronic expansion valve, wherein the evaporator, the electronic expansion valve, the condenser and the variable-frequency compressor are sequentially connected in series to form a loop.
6. The environment test chamber according to claim 5, wherein the sensor unit comprises an in-chamber temperature sensor, a variable frequency compressor suction pressure sensor and a variable frequency compressor exhaust pressure sensor, wherein the variable frequency compressor suction pressure sensor and the variable frequency compressor exhaust pressure sensor are respectively arranged at an inlet and an outlet of the variable frequency compressor; The control unit comprises an evaporator fan rotating speed control module, a variable frequency compressor rotating speed control module, an electronic expansion valve opening control module, a condenser fan rotating speed control module and a collection calculation control module; The collecting and calculating control module is electrically connected with the temperature sensor in the box, the electronic expansion valve opening control module is electrically connected with the electronic expansion valve, the variable-frequency compressor rotating speed control module is electrically connected with the variable-frequency compressor, the condenser fan rotating speed control module is electrically connected with the condenser fan, and the evaporator fan rotating speed control module is electrically connected with the evaporator fan.

Description

Linear cooling control method of environment test box and environment test box Technical Field The invention relates to the technical field of environmental test equipment control, in particular to a linear cooling control method of an environmental test box and the environmental test box. Background With the increasing progress of life and technology, the requirements on the reliability of products are higher and higher. In many fields, it is necessary to test reliability, material stress change, change in material properties, etc. of products or parts in the course of lowering from high temperature to low temperature for a certain period of time. In the linear cooling process, the refrigerating capacity demand can be increased along with the decrease of the temperature. The evaporating temperature needs to be reduced along with the reduction of the temperature, and when the condensing temperature is constant, the refrigerating capacity of the compressor is reduced along with the reduction of the evaporating temperature. Therefore, the compressor capacity exerted from the start to the end of the linear cooling is greatly different. Currently, a fixed-frequency compressor is mostly used for linear cooling. The compressor is selected according to the maximum refrigerating capacity requirement of the linear cooling process, which can cause higher energy consumption of the whole compressor in the linear cooling process. In addition, the refrigerating capacity change in the linear cooling process is larger, and is also very important for controlling the evaporator fan and the condenser fan, when the air quantity of the evaporator fan and the condenser fan is smaller, the running reliability and the cold capacity exertion of the system can be influenced, and when the air quantity is larger, the energy conservation is poorer. Therefore, optimizing the system control and operation in the linear cooling process is important to improving the system operation reliability and reducing the system operation energy consumption. Disclosure of Invention The invention provides a linear cooling control method of an environment test box and the environment test box, which are used for solving the problem of poor energy conservation of the conventional linear cooling control method of the environment test box. According to an aspect of the present invention, there is provided a linear cooling control method for an environmental test chamber, including: Acquiring the temperature in the environment to be controlled test box, the suction pressure of the variable frequency compressor and the exhaust pressure of the variable frequency compressor; Calculating the linear cooling rate of the environment to be controlled test box based on preset temperature parameters; Obtaining a database according to the temperature in the box, the suction pressure of the variable-frequency compressor, the exhaust pressure of the variable-frequency compressor and the linear cooling rate, and respectively calculating the target rotating speed of the variable-frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan of the environment to be controlled test box based on the database; And respectively controlling the variable-frequency compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the environment test box to be controlled to act based on the calculated target rotating speed of the variable-frequency compressor, the target opening of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan so as to realize the linear cooling control of the environment test box to be controlled. Optionally, the obtaining a database according to the temperature in the box, the suction pressure of the variable frequency compressor, the exhaust pressure of the variable frequency compressor and the linear cooling rate, and calculating the target rotation speed of the variable frequency compressor, the target opening of the electronic expansion valve, the target rotation speed of the evaporator fan and the target rotation speed of the condenser fan of the environmental test box to be controlled based on the database respectively includes: Obtaining a first database according to the temperature in the box and the linear cooling rate; determining the initial rotating speed of the variable frequency compressor according to the first database; obtaining a second database according to the suction pressure of the variable frequency compressor and the discharge pressure of the variable frequency compressor; determining the corrected rotating speed of the variable frequency compressor according to the second database; and calculating the target rotating speed of the variable frequency compressor of the environment test box to be controlled according to the