阅读说明：本技术 高低温试验箱及其控制方法 (High-low temperature test chamber and control method thereof ) 是由 叶南洋 董明星 于 2021-08-27 设计创作，主要内容包括：本发明提供了一种高低温试验箱及其控制方法,在降温时,把试验腔的空气抽入高温气体存储腔,并把低温气体存储腔中的空气送入对应的试验腔中,再通过对应的第一加热器、第一冷凝器把温度调整至对应的低温温度,从而实现快速降温；在升温时,把试验腔的空气抽入低温气体存储腔,并把高温气体存储腔中的空气送入对应的试验腔中,再通过对应的第一加热器、第一冷凝器把温度调整至对应的高温温度,从而实现快速升温；由于降温时不是直接对试验腔中的热空气进行降温,而是先把冷空气替换到试验腔后再根据需要进行调温,可节省电能,升温时不是直接对试验腔中的冷空气进行升温,而是先把热空气替换到试验腔后再根据需要进行调温,可节省电能。(The invention provides a high-low temperature test chamber and a control method thereof, wherein during cooling, air in a test chamber is pumped into a high-temperature gas storage chamber, the air in the low-temperature gas storage chamber is sent into a corresponding test chamber, and the temperature is adjusted to the corresponding low-temperature through a corresponding first heater and a first condenser, so that the rapid cooling is realized; when the temperature is raised, air in the test chamber is pumped into the low-temperature gas storage chamber, the air in the high-temperature gas storage chamber is sent into the corresponding test chamber, and the temperature is adjusted to the corresponding high-temperature through the corresponding first heater and the first condenser, so that the rapid temperature rise is realized; because the hot air in the test chamber is not directly cooled during cooling, the cold air is replaced to the test chamber and then the temperature is adjusted according to the requirement, the electric energy can be saved, the cold air in the test chamber is not directly heated during heating, the hot air is replaced to the test chamber and then the temperature is adjusted according to the requirement, and the electric energy can be saved.)

1. A high-low temperature test chamber comprises a chamber body (1) and a controller (2); the device is characterized in that the inner cavity of the box body (1) is divided into at least one test cavity (3), a high-temperature gas storage cavity (4) and a low-temperature gas storage cavity (5); a first heater (6) and a first condenser (7) are arranged in the test cavity (3); at least one blower (8) and at least one suction fan (9) are arranged on the wall of the test cavity (3); the blower (8) and the suction fan (9) are both communicated with the high-temperature gas storage cavity (4) and the low-temperature gas storage cavity (5); a first electromagnetic valve (10) is arranged on a connecting pipeline between the suction fan (9) and the high-temperature gas storage cavity (4), a second electromagnetic valve (11) is arranged on a connecting pipeline between the suction fan (9) and the low-temperature gas storage cavity (5), a third electromagnetic valve (12) is arranged on a connecting pipeline between the blower (8) and the high-temperature gas storage cavity (4), and a fourth electromagnetic valve (13) is arranged on a connecting pipeline between the blower (8) and the low-temperature gas storage cavity (5); a first temperature sensor (14) is arranged in each of the test cavity (3), the high-temperature gas storage cavity (4) and the low-temperature gas storage cavity (5); a second heater (15) is arranged in the high-temperature gas storage cavity (4); and a second condenser (16) is arranged in the low-temperature gas storage cavity (5).

2. The high-low temperature test chamber as claimed in claim 1, wherein the outlet of the suction fan (9) of the same test chamber (3) is communicated to the same suction main pipe (17), a suction branch pipe is connected between the suction main pipe (17) and the high-temperature gas storage chamber (4) and the low-temperature gas storage chamber (5), and the first electromagnetic valve (10) and the second electromagnetic valve (11) are respectively arranged on the corresponding suction branch pipes;

the inlet of a blower (8) of the same test cavity (3) is communicated to the same blowing main pipe (18), a blowing branch pipe is connected between the blowing main pipe (18) and the high-temperature gas storage cavity (4) and between the blowing main pipe and the low-temperature gas storage cavity (5), and the third electromagnetic valve (12) and the fourth electromagnetic valve (13) are respectively arranged on the corresponding blowing branch pipes.

3. The high-low temperature test chamber as claimed in claim 2, wherein a circulating air pipe (19) is connected between the air suction main pipe (17) and the air blowing main pipe (18) of the same test chamber (3), and a fifth electromagnetic valve (20) is arranged on the circulating air pipe (19).

4. High-low temperature test chamber according to claim 2, characterized in that the outside of the chamber body (1) is provided with a second temperature sensor (21), the second temperature sensor (21) being used for measuring the external temperature; the high-temperature gas storage cavity (4) and the low-temperature gas storage cavity (5) are both provided with an electric cabin door (22), and the electric cabin door (22) is used for being communicated with the outside when being opened.

5. A high-low temperature test chamber according to claim 4, wherein a pressure sensor (23) is provided in each of the high-temperature gas storage chamber (4) and the low-temperature gas storage chamber (5).

6. High-low temperature test chamber according to claim 1, characterized in that the test chamber (3) is provided in two.

7. A high-low temperature test chamber control method applied to a controller (2) of a high-low temperature test chamber according to any one of claims 1 to 6, the high-low temperature test chamber control method comprising the steps of:

A1. acquiring a target temperature curve of each test cavity (3);

A2. extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity (3) according to the target temperature curve;

A3. when the experiment time reaches the temperature reduction time point, pumping the air of the corresponding test cavity (3) into the high-temperature gas storage cavity (4), sending the air in the low-temperature gas storage cavity (5) into the corresponding test cavity (3), and adjusting the air temperature of the corresponding test cavity (3) to the corresponding low-temperature through the corresponding first heater (6) and the corresponding first condenser (7);

A4. when the experiment time reaches the temperature rise time point, air in the corresponding test cavity (3) is pumped into the low-temperature gas storage cavity (5), air in the high-temperature gas storage cavity (4) is sent into the corresponding test cavity (3), and then the air temperature of the corresponding test cavity (3) is adjusted to the corresponding high-temperature through the corresponding first heater (6) and the corresponding first condenser (7).

8. The high-low temperature test chamber control method according to claim 7, further comprising, after the step A2, the steps of:

acquiring air temperature data of the low-temperature gas storage cavity (5);

judging whether the air temperature of the low-temperature gas storage cavity (5) is higher than a first target temperature or not; the first target temperature is the lowest value of the low temperature temperatures;

if yes, reducing the air temperature of the low-temperature gas storage cavity (5) to the first target temperature through a second condenser (16) of the low-temperature gas storage cavity (5);

acquiring air temperature data of the high-temperature gas storage cavity (4);

judging whether the air temperature of the high-temperature gas storage cavity (4) is lower than a second target temperature or not; the second target temperature is the highest value of the high temperature temperatures;

if yes, the air temperature of the high-temperature gas storage cavity (4) is increased to the second target temperature through a second heater (15) of the high-temperature gas storage cavity (4).

9. The high-low temperature test chamber control method according to claim 7, wherein there are two test chambers (3); step a2 includes:

the target temperature curve of one test cavity (3) is taken as a reference curve, the target temperature curve of the other test cavity (3) is taken as an adjustment curve, and the optimal delay starting time of the adjustment curve relative to the reference curve is obtained; when the adjustment curve is started in a delayed manner according to the optimal delayed starting time, the time sum of the two target temperature curves in the high-low temperature opposite state is maximum;

delaying the starting time of the adjusting curve according to the optimal delay starting time;

and extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity (3) according to the reference curve and the adjustment curve of the delayed starting time.

10. The high-low temperature test chamber control method according to claim 7, further comprising the steps of:

acquiring external environment temperature data, air temperature data of a low-temperature gas storage cavity (5) and air temperature data of a high-temperature gas storage cavity (4);

if the external environment temperature is lower than the air temperature of the low-temperature gas storage cavity (5), opening an electric cabin door (22) of the low-temperature gas storage cavity (5);

if the external environment temperature is higher than the air temperature of the high-temperature gas storage cavity (4), the electric cabin door (22) of the high-temperature gas storage cavity (4) is opened.

Technical Field

The invention relates to the technical field of environmental tests, in particular to a high-low temperature test chamber and a control method thereof.

Background

The high-low temperature test box is a device for performing high-low temperature cycle tests on electrical products, electronic products, instruments, meters and the like. A heater and a condenser are only arranged in a test cavity of a general high-low temperature test box, the heater is started to heat air in the test cavity when temperature is required to rise so as to reach required high temperature, and the condenser is started to cool the air in the test cavity when temperature is required to fall so as to reach required low temperature.

This kind of high low temperature test box directly cools down the hot-air in the test chamber when cooling down, needs to consume more electric energy, directly heats the cold air in the test chamber when rising temperature, also needs to consume more electric energy. In addition, because directly carry out the heating and cooling to the air in the experimental chamber, the temperature deviation between high and low temperature is great, and the required time of heating and cooling is longer, when needs carry out quick high low temperature cycle test, often is difficult to satisfy experimental requirement.

Disclosure of Invention

In view of the defects of the prior art, an object of the embodiments of the present application is to provide a high and low temperature test chamber and a control method thereof, which not only save electric energy, but also can realize rapid temperature rise and fall.

In a first aspect, an embodiment of the application provides a high and low temperature test chamber, which includes a chamber body and a controller; the inner cavity of the box body is divided into at least one test cavity, a high-temperature gas storage cavity and a low-temperature gas storage cavity; a first heater and a first condenser are arranged in the test cavity; the wall of the test cavity is provided with at least one blower and at least one suction fan; the blower and the suction fan are both communicated with the high-temperature gas storage cavity and the low-temperature gas storage cavity; a first electromagnetic valve is arranged on a connecting pipeline between the suction fan and the high-temperature gas storage cavity, a second electromagnetic valve is arranged on a connecting pipeline between the suction fan and the low-temperature gas storage cavity, a third electromagnetic valve is arranged on a connecting pipeline between the blower and the high-temperature gas storage cavity, and a fourth electromagnetic valve is arranged on a connecting pipeline between the blower and the low-temperature gas storage cavity; the test cavity, the high-temperature gas storage cavity and the low-temperature gas storage cavity are internally provided with a first temperature sensor; a second heater is arranged in the high-temperature gas storage cavity; and a second condenser is arranged in the low-temperature gas storage cavity.

According to the high-low temperature test box, when a high-low temperature cycle test is carried out, when the temperature needs to be reduced, air in the test cavity is pumped into the high-temperature gas storage cavity, the air in the low-temperature gas storage cavity is sent into the corresponding test cavity, and the air temperature of the corresponding test cavity is adjusted to the corresponding low-temperature through the corresponding first heater and the corresponding first condenser, so that the rapid temperature reduction is realized; when the temperature needs to be raised, air in the test cavity is pumped into the low-temperature gas storage cavity, the air in the high-temperature gas storage cavity is sent into the corresponding test cavity, and the air temperature of the corresponding test cavity is adjusted to the corresponding high-temperature through the corresponding first heater and the corresponding first condenser, so that the rapid temperature rise is realized; because the hot air in the test chamber is not directly cooled during cooling, but the cold air in the low-temperature gas storage chamber is replaced to the test chamber before temperature adjustment is carried out as required, the electric energy can be saved, the cold air in the test chamber is not directly heated during heating, the hot air in the high-temperature gas storage chamber is replaced to the test chamber before temperature adjustment is carried out as required, and the electric energy can be saved.

Preferably, the outlet of the suction fan of the same test chamber is communicated to the same suction main pipe, a suction branch pipe is connected between the suction main pipe and the high-temperature gas storage chamber and between the suction main pipe and the low-temperature gas storage chamber, and the first electromagnetic valve and the second electromagnetic valve are respectively arranged on the corresponding suction branch pipes;

the inlet of the blower of the same test chamber is communicated to the same blowing main pipe, a blowing branch pipe is connected between the blowing main pipe and the high-temperature gas storage chamber and between the blowing main pipe and the low-temperature gas storage chamber, and the third electromagnetic valve and the fourth electromagnetic valve are respectively arranged on the corresponding blowing branch pipes.

Preferably, a circulating air pipe is connected between the air suction main pipe and the air blowing main pipe of the same test cavity, and a fifth electromagnetic valve is arranged on the circulating air pipe.

Preferably, a second temperature sensor is arranged on the outer side of the box body and used for measuring the external temperature; the high-temperature gas storage cavity and the low-temperature gas storage cavity are both provided with electric cabin doors, and the electric cabin doors are used for being communicated with the outside when being opened.

Preferably, a pressure sensor is arranged in each of the high-temperature gas storage cavity and the low-temperature gas storage cavity.

Preferably, there are two test chambers.

In a second aspect, an embodiment of the present application provides a high-low temperature test chamber control method, which is applied to a controller of the high-low temperature test chamber, and the high-low temperature test chamber control method includes the steps of:

A1. acquiring a target temperature curve of each test cavity;

A2. extracting the cooling time points, the corresponding low-temperature temperatures, the heating time points and the corresponding high-temperature temperatures of the test cavities according to the target temperature curve;

A3. when the experiment time reaches the temperature reduction time point, pumping air of the corresponding test cavity into the high-temperature gas storage cavity, sending the air in the low-temperature gas storage cavity into the corresponding test cavity, and adjusting the air temperature of the corresponding test cavity to the corresponding low-temperature through the corresponding first heater and the corresponding first condenser;

A4. when the experiment time reaches the temperature rise time point, air in the corresponding test cavity is pumped into the low-temperature gas storage cavity, the air in the high-temperature gas storage cavity is sent into the corresponding test cavity, and the air temperature of the corresponding test cavity is adjusted to the corresponding high-temperature through the corresponding first heater and the corresponding first condenser.

Preferably, after the step a2, the method further comprises the steps of:

acquiring air temperature data of the low-temperature gas storage cavity;

judging whether the air temperature of the low-temperature gas storage cavity is higher than a first target temperature or not; the first target temperature is the lowest value of the low temperature temperatures;

if so, reducing the air temperature of the low-temperature gas storage cavity to the first target temperature through a second condenser of the low-temperature gas storage cavity;

acquiring air temperature data of the high-temperature gas storage cavity;

judging whether the air temperature of the high-temperature gas storage cavity is lower than a second target temperature or not; the second target temperature is the highest value of the high temperature temperatures;

and if so, raising the air temperature of the high-temperature gas storage cavity to the second target temperature through a second heater of the high-temperature gas storage cavity.

Preferably, there are two of said test chambers; step a2 includes:

taking the target temperature curve of one test cavity as a reference curve and the target temperature curve of the other test cavity as an adjustment curve, and acquiring the optimal delay starting time of the adjustment curve relative to the reference curve; when the adjustment curve is started in a delayed manner according to the optimal delayed starting time, the time sum of the two target temperature curves in the high-low temperature opposite state is maximum;

delaying the starting time of the adjusting curve according to the optimal delay starting time;

and extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity according to the reference curve and the adjustment curve of the delayed starting time.

Preferably, the high and low temperature test chamber control method further includes the steps of:

acquiring external environment temperature data, air temperature data of a low-temperature gas storage cavity and air temperature data of a high-temperature gas storage cavity;

if the external environment temperature is lower than the air temperature of the low-temperature gas storage cavity, opening an electric cabin door of the low-temperature gas storage cavity;

and if the external environment temperature is higher than the air temperature of the high-temperature gas storage cavity, opening the electric cabin door of the high-temperature gas storage cavity.

Has the advantages that:

according to the high-low temperature test chamber and the control method thereof, when a high-low temperature cycle test is carried out, when the temperature needs to be reduced, air in the test chamber is pumped into the high-temperature gas storage chamber, the air in the low-temperature gas storage chamber is sent into the corresponding test chamber, and the air temperature of the corresponding test chamber is adjusted to the corresponding low-temperature through the corresponding first heater and the corresponding first condenser, so that the rapid temperature reduction is realized; when the temperature needs to be raised, air in the test cavity is pumped into the low-temperature gas storage cavity, the air in the high-temperature gas storage cavity is sent into the corresponding test cavity, and the air temperature of the corresponding test cavity is adjusted to the corresponding high-temperature through the corresponding first heater and the corresponding first condenser, so that the rapid temperature rise is realized; because the hot air in the test chamber is not directly cooled during cooling, but the cold air in the low-temperature gas storage chamber is replaced to the test chamber before temperature adjustment is carried out as required, the electric energy can be saved, the cold air in the test chamber is not directly heated during heating, the hot air in the high-temperature gas storage chamber is replaced to the test chamber before temperature adjustment is carried out as required, and the electric energy can be saved.

Drawings

Fig. 1 is a schematic structural diagram of a high and low temperature test chamber provided in an embodiment of the present application.

Fig. 2 is a flowchart of a high-low temperature test chamber control method according to an embodiment of the present application.

Fig. 3 is an exemplary target temperature profile.

Fig. 4 is a target temperature profile after a delayed start-up time.

Description of reference numerals: 1. a box body; 2. a controller; 3. a test chamber; 4. a high temperature gas storage chamber; 5. a cryogenic gas storage chamber; 6. a first heater; 7. a first condenser; 8. a blower; 9. a suction fan; 10. a first solenoid valve; 11. a second solenoid valve; 12. a third electromagnetic valve; 13. a fourth solenoid valve; 14. a first temperature sensor; 15. a second heater; 16. a second condenser; 17. a main air suction pipe; 18. a blowing header pipe; 19. a circulating air duct; 20. a fifth solenoid valve; 21. a second temperature sensor; 22. an electric compartment door; 23. a pressure sensor.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

Referring to fig. 1, an embodiment of the present application provides a high and low temperature test chamber, which includes a chamber body 1 and a controller 2; the inner cavity of the box body 1 is divided into at least one test cavity 3, a high-temperature gas storage cavity 4 and a low-temperature gas storage cavity 5; a first heater 6 and a first condenser 7 are arranged in the test cavity 3; the wall of the test cavity 3 is provided with at least one blower 8 and at least one suction fan 9; the blower 8 and the suction fan 9 are both communicated with the high-temperature gas storage cavity 4 and the low-temperature gas storage cavity 5; a first electromagnetic valve 10 is arranged on a connecting pipeline between the suction fan 9 and the high-temperature gas storage cavity 4, a second electromagnetic valve 11 is arranged on a connecting pipeline between the suction fan 9 and the low-temperature gas storage cavity 5, a third electromagnetic valve 12 is arranged on a connecting pipeline between the blower 8 and the high-temperature gas storage cavity 4, and a fourth electromagnetic valve 13 is arranged on a connecting pipeline between the blower 8 and the low-temperature gas storage cavity 5; a first temperature sensor 14 is arranged in each of the test chamber 3, the high-temperature gas storage chamber 4 and the low-temperature gas storage chamber 5; a second heater 15 is arranged in the high-temperature gas storage cavity 4; a second condenser 16 is arranged in the low-temperature gas storage chamber 5.

When the high-low temperature test box is used for carrying out high-low temperature cycle tests and needs to be cooled, air in the test cavity 3 is pumped into the high-temperature gas storage cavity 4 (the corresponding first electromagnetic valve 10 is opened, and air is sucked by the corresponding suction fan 9), air in the low-temperature gas storage cavity 5 is sent into the corresponding test cavity 3 (the corresponding fourth electromagnetic valve 13 is opened, and air is blown by the corresponding blower 8), and then the air temperature of the corresponding test cavity 3 is adjusted to the corresponding low-temperature through the corresponding first heater 6 and the corresponding first condenser 7, so that the rapid cooling is realized; when the temperature needs to be raised, air in the test chamber 3 is pumped into the low-temperature gas storage chamber 5 (the corresponding second electromagnetic valve 11 is opened, and air is sucked by the corresponding suction fan 9), air in the high-temperature gas storage chamber 4 is sent into the corresponding test chamber 3 (the corresponding third electromagnetic valve 12 is opened, and air is blown by the corresponding blower 8), and then the air temperature of the corresponding test chamber 3 is adjusted to the corresponding high-temperature through the corresponding first heater 6 and the corresponding first condenser 7, so that the rapid temperature rise is realized; because the hot air in the test chamber 3 is not directly cooled during cooling, the cold air in the low-temperature gas storage chamber 5 is replaced to the test chamber 3 and then is subjected to temperature adjustment according to needs, the electric energy can be saved, and the hot air in the high-temperature gas storage chamber 4 is replaced to the test chamber 3 and then is subjected to temperature adjustment according to needs instead of directly heating the cold air in the test chamber 3 during heating, so the electric energy can be saved; in addition, the cold air discharged out of the test chamber 3 can be stored in the low-temperature gas storage chamber 5 for recycling, and the hot air discharged out of the test chamber 3 can be stored in the high-temperature gas storage chamber 4 for recycling, so that the electric energy can be further saved.

The number of the blowers 8 and the suction blowers 9 of each test chamber 3 can be set according to actual requirements; the greater the number of blowers 8 and suction blowers 9, the faster the ventilation speed and thus the heating and cooling speed, and therefore, the blower 8 and suction blower 9 are preferably provided in plurality, for example, 12 blowers 8 and 12 suction blowers 9 are provided for each test chamber 3.

In some preferred embodiments, the outlet of the suction fan 9 of the same test chamber 3 is communicated to the same suction main pipe 17, a suction branch pipe is connected between the suction main pipe 17 and the high-temperature gas storage chamber 4 and the low-temperature gas storage chamber 5, and the first electromagnetic valve 10 and the second electromagnetic valve 11 are respectively arranged on the corresponding suction branch pipes;

the inlet of the blower 8 of the same test chamber 3 is communicated to the same blowing main pipe 18, a blowing branch pipe is connected between the blowing main pipe 18 and the high-temperature gas storage chamber 4 and between the blowing main pipe 18 and the low-temperature gas storage chamber 5, and the third electromagnetic valve 12 and the fourth electromagnetic valve 13 are respectively arranged on the corresponding blowing branch pipes.

Therefore, when each test chamber 3 is provided with a plurality of blowers 8 and suction fans 9, the air flow is conveyed through the air blowing main pipe 18 and the air suction main pipe 17, the number of pipelines and the number of electromagnetic valves can be reduced, the air pipeline structure is simplified, and the equipment cost is reduced.

In some preferred embodiments, a circulation air pipe 19 is connected between the suction manifold 17 and the blowing manifold 18 of the same test chamber 3, and a fifth electromagnetic valve 20 is arranged on the circulation air pipe 19. When the temperature needs to be adjusted by using the first heater 6 and the first condenser 7 in the test chamber 3 after the ventilation is completed, the corresponding fifth electromagnetic valve 20 is opened, the corresponding first electromagnetic valve 10, second electromagnetic valve 11, third electromagnetic valve 12 and fourth electromagnetic valve 13 are closed, and the corresponding blower 8 and suction fan 9 are started, so that the air circulation flow of the test chamber 3 is realized, and the uniformity of the temperature of the test chamber 3 can be improved.

Preferably, a second temperature sensor 21 is disposed on the outer side of the box body 1, and the second temperature sensor 21 is used for measuring the external temperature (referring to the temperature of the external air); the high-temperature gas storage cavity 4 and the low-temperature gas storage cavity 5 are both provided with an electric cabin door 22, and the electric cabin door 22 is used for communicating the outside when being opened. Sometimes, when the temperature of the external air is lower than the temperature in the low-temperature gas storage cavity 5, the external air can be directly used as a cold air source to open the electric cabin door 22 of the low-temperature gas storage cavity 5, so that the electric energy can be further saved; when the temperature of the outside air is higher than the temperature in the high-temperature gas storage cavity 4, the outside air can be directly used as a hot air source to open the electric cabin door 22 of the high-temperature gas storage cavity 4, so that the electric energy can be further saved.

Wherein, the number of the test cavities 3 can be set according to actual needs; when the test chamber 3 is provided with a plurality of, every test chamber 3 can work independently, carries out different high low temperature cycle test respectively. For example, in fig. 1, two test chambers 3 are provided.

Further, pressure sensors 23 are arranged in the high-temperature gas storage chamber 4 and the low-temperature gas storage chamber 5. In practical application, when a plurality of test chambers 3 are in a high-temperature maintaining stage or a low-temperature maintaining stage together, air in the high-temperature gas storage chamber 4 or the low-temperature gas storage chamber 5 is greatly extracted to cause insufficient air, and at this time, the pressure sensor 23 can detect that the air pressure is too low and open the corresponding electric compartment door 22 to supplement the air; in addition, when a plurality of test chambers 3 send air to the high-temperature gas storage chamber 4 or the low-temperature gas storage chamber 5 at the same time, the air pressure in the high-temperature gas storage chamber 4 or the low-temperature gas storage chamber 5 is too high, so that an accident or an equipment fault is easily caused, and at this time, the pressure sensor 23 can detect that the air pressure is too high and open the corresponding electric compartment door 22 for pressure relief.

It should be noted that the first heater 6, the first condenser 7, the blower 8, the suction fan 9, the first electromagnetic valve 10, the second electromagnetic valve 11, the third electromagnetic valve 12, the fourth electromagnetic valve 13, the first temperature sensor 14, the second heater 15, the second condenser 16, the fifth electromagnetic valve 20, the second temperature sensor 21, the electric cabin door 22, and the pressure sensor 23 are all electrically connected to the controller 2, and the working process of the high-low temperature test chamber is controlled by the controller 2.

In addition, the inner side walls of the test chamber 3, the high-temperature gas storage chamber 4 or the low-temperature gas storage chamber 5 are all provided with heat insulation layers so as to avoid heat loss of hot gas and absorption of external heat by cold gas, and further reduce energy consumption; the outer surface of the box body 1 can be coated with a heat insulation layer so as to further reduce energy consumption.

Wherein, the blower 8 and the suction fan 9 can be a centrifugal fan or an axial flow fan; for example, in fig. 1, the blower 8 and the suction fan 9 are both axial flow fans.

In some preferred embodiments, the blower 8 and the suction fan 9 are both provided with a rotary encoder to measure the rotation speed, the outside of the box 1 is provided with an alarm indicating device (such as a display screen, an indicator light, etc.), and when the deviation between the actual rotation speed of the blower 8 or the suction fan 9 and the preset target rotation speed is greater than the allowable deviation range, the controller 2 controls the alarm indicating device to indicate which blower is out of order, so that the worker knows the equipment failure condition.

Referring to fig. 2, an embodiment of the present application provides a high-low temperature test chamber control method, which is applied to a controller of the high-low temperature test chamber, and the high-low temperature test chamber control method includes the steps of:

A1. acquiring a target temperature curve of each test cavity 3;

A2. extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity 3 according to the target temperature curve;

A3. when the experiment time reaches the temperature reduction time point, pumping the air of the corresponding test cavity 3 into the high-temperature gas storage cavity 4, sending the air in the low-temperature gas storage cavity 5 into the corresponding test cavity 3, and adjusting the air temperature of the corresponding test cavity 3 to the corresponding low-temperature through the corresponding first heater 6 and the corresponding first condenser 7;

A4. when the experiment time reaches the temperature rise time point, air in the corresponding test cavity 3 is pumped into the low-temperature gas storage cavity 5, air in the high-temperature gas storage cavity 4 is sent into the corresponding test cavity 3, and the air temperature of the corresponding test cavity 3 is adjusted to the corresponding high-temperature through the corresponding first heater 6 and the corresponding first condenser 7.

The target temperature curve is a temperature change curve for testing, and when high and low temperature tests are performed, the temperature of the test chamber 3 needs to be controlled to change according to the corresponding target temperature curve. The general target temperature curve comprises a plurality of high-temperature maintaining sections and low-temperature maintaining sections which are alternately changed, wherein the temperature corresponding to the high-temperature maintaining sections is high-temperature, and the temperature of the low-temperature maintaining sections is low-temperature; for example, two target temperature curves (a and b) in fig. 3, the high temperature of the target temperature curve a is T1, the low temperature is T2, the high temperature retention time is T1, and the low temperature retention time is T1; the high temperature of the target temperature curve b is T3, the low temperature is T4, the high temperature retention time is T2, and the low temperature retention time is T2.

In some preferred embodiments, after step a2, the method further comprises the steps of:

acquiring air temperature data of the low-temperature gas storage cavity 5;

judging whether the air temperature of the low-temperature gas storage cavity 5 is higher than a first target temperature; the first target temperature is the lowest value of the low temperature temperatures;

if so, reducing the air temperature of the low-temperature gas storage chamber 5 to the first target temperature through the second condenser 16 of the low-temperature gas storage chamber 5;

acquiring air temperature data of the high-temperature gas storage cavity 4;

judging whether the air temperature of the high-temperature gas storage cavity 4 is lower than a second target temperature or not; the second target temperature is the highest value of the high temperature temperatures;

if so, the air temperature of the high-temperature gas storage chamber 5 is raised to the second target temperature by the second heater 15 of the high-temperature gas storage chamber 4.

In this embodiment, if only one test chamber 3 is provided, the first target temperature is the low temperature of this test chamber 3, the second target temperature is the high temperature of this test chamber 3, the air temperature in the low-temperature gas storage chamber 5 is maintained at the first target temperature, the air temperature in the high-temperature gas storage chamber 4 is maintained at the second target temperature, thereby being equivalent to adjusting the temperature in advance, when the test chamber 3 needs to be switched between high and low temperatures, after directly sending the air in the high-temperature gas storage chamber 4 or the low-temperature gas storage chamber 5 into the test chamber 3, the temperature of the test chamber 3 is very close to the corresponding target temperature, the target temperature can be reached more quickly when the temperature is adjusted by the first heater 6 and the first condenser 7, and therefore, more quick temperature rise and fall can be realized.

If a plurality of test chambers 3 are arranged, the lowest value of the low-temperature temperatures of the test chambers 3 is used as the first target temperature, so that the air in the low-temperature gas storage chamber 5 is ensured to be sufficiently cold, based on the reasons, the test chamber 3 corresponding to the lowest value can achieve the effect of more rapidly cooling, and other test chambers 3 can adjust the ventilation volume according to the deviation between the low-temperature and the first target temperature and the deviation between the current temperature and the first target temperature, so that the temperature after ventilation is close to the corresponding low-temperature, and the effect of rapidly cooling can be achieved; thus, step a3 includes:

calculating a first temperature deviation between the low-temperature of each test cavity 3 and a first target temperature, and a second temperature deviation between the current temperature (namely the temperature before cooling, which is the corresponding high-temperature) and the first target temperature;

substituting the first temperature deviation and the second temperature deviation into a preset air exchange time calculation formula to obtain first air exchange time;

the duration of drawing the air of the corresponding test chamber 3 into the high-temperature gas storage chamber 4 and the duration of sending the air of the low-temperature gas storage chamber 5 into the corresponding test chamber 3 are controlled according to the first ventilation time (specifically, by controlling the opening durations of the first solenoid valve 10 and the fourth solenoid valve 13).

The optimal ventilation time under different first temperature deviations (including positive and negative deviations) and second temperature deviations (including positive and negative deviations) can be obtained in advance through tests, so that the deviation between the temperature of the test chamber 3 after ventilation and the target temperature is within a preset temperature tolerance range, and then a formula for calculating the ventilation time through the first temperature deviation and the second temperature deviation is fitted through a curve fitting method, so that a preset ventilation time calculation formula is obtained. Calculate first time of taking a breath according to this formula after, take a breath according to this first time of taking a breath, can guarantee that the test chamber 3 temperature after taking a breath is close the target temperature that corresponds, rethread first heater 6 and first condenser 7 can reach the target temperature more fast when carrying out temperature adjustment, consequently can realize more quick cooling.

Since the temperature of the test chamber 3 after ventilation is generally not equal to the corresponding target temperature, temperature adjustment by the first heater 6 and the first condenser 7 is also required, but starting the first heater 6 and the first condenser 7 requires a start-up time, and restarting the first heater 6 or the first condenser 7 after ventilation is completed affects the temperature adjustment speed. Therefore, in some preferred embodiments, in step a3, it can be determined whether the first heater 6 or the first condenser 7 needs to be activated according to the temperature difference Δ T between the actual temperature and the target temperature at the time of completing ventilation in N (N is a preset positive integer) cooling processes before the current time, and the temperature adjustment speed can be increased before completing ventilation. For example, a temperature difference calculation formula is fitted according to the temperature difference Δ T between the actual temperature and the target temperature at the time of completing ventilation in N cooling processes before the current time, and then the temperature difference Δ T0 between the actual temperature and the target temperature at the time of completing ventilation is estimated according to the temperature difference calculation formula, if the temperature difference Δ T0 is positive, the first condenser 7 is started before the current ventilation is completed, and if the temperature difference Δ T0 is negative, the first heater 6 is started before the current ventilation is completed. Wherein the start-in-advance of the first condenser 7 and the start-in-advance of the first condenser 7 may be performed according to a preset time value; or calculating the advance time according to the following formula and executing according to the calculation result: t1= a1 | Δ T0| + b1, T2= a2 | Δ T0| + b2, T1 is the advance time for the advance start of the first condenser 7, T2 is the advance time for the advance start of the first heater 6, and a1, b1, a2, b2 are preset calculation coefficients.

Similarly, if a plurality of test chambers 3 are provided, the highest value of the high-temperature temperatures of the test chambers 3 is used as the second target temperature, so that the air in the high-temperature gas storage chamber 4 is ensured to be sufficiently hot, based on the above reasons, the test chamber 3 corresponding to the highest value can achieve the effect of raising the temperature more quickly, and the other test chambers 3 can adjust the ventilation volume according to the deviation between the high-temperature and the second target temperature and the deviation between the current temperature and the first target temperature, so that the temperature after ventilation is close to the corresponding high-temperature, and the effect of raising the temperature quickly can also be achieved; thus, step a4 includes:

calculating a third temperature deviation between the high temperature of each test chamber 3 and the second target temperature, and a fourth temperature deviation between the current temperature (i.e. the temperature before temperature rise, which is the corresponding low temperature) and the second target temperature;

substituting the third temperature deviation and the fourth temperature deviation into a preset ventilation time calculation formula (the calculation formula is the same as the calculation formula in the step A3, wherein, in the calculation, the third temperature deviation is used for replacing the first temperature deviation, and the fourth temperature deviation is used for replacing the second temperature deviation), so as to obtain a second ventilation time;

the duration of the suction of the air of the corresponding test chamber 3 into the low-temperature gas storage chamber 5 and the duration of the delivery of the air of the high-temperature gas storage chamber 4 into the corresponding test chamber 3 are controlled on the basis of the second ventilation time (specifically, by controlling the opening durations of the second solenoid valve 11 and the third solenoid valve 12).

After calculating the second time of taking a breath according to the time calculation formula of predetermineeing to take a breath, take a breath according to this second time of taking a breath, can guarantee that the test chamber 3 temperature after taking a breath is close the target temperature that corresponds, rethread first heater 6 and first condenser 7 can reach the target temperature more fast when carrying out temperature adjustment, consequently can realize more quick intensification.

Since the temperature of the test chamber 3 after ventilation is generally not equal to the corresponding target temperature, temperature adjustment by the first heater 6 and the first condenser 7 is also required, but starting the first heater 6 and the first condenser 7 requires a start-up time, and restarting the first heater 6 or the first condenser 7 after ventilation is completed affects the temperature adjustment speed. Therefore, in some preferred embodiments, in step a4, it can be determined whether the first heater 6 or the first condenser 7 needs to be activated according to the temperature difference Δ T between the actual temperature and the target temperature at the time of completing ventilation in N (N is a preset positive integer) times of temperature raising processes before the current time, and the temperature raising speed can be increased before completing ventilation. For example, a temperature difference calculation formula is fitted according to the temperature difference Δ T between the actual temperature and the target temperature at the time of completing ventilation in N cooling processes before the current time, and then the temperature difference Δ T0 between the actual temperature and the target temperature at the time of completing ventilation is estimated according to the temperature difference calculation formula, if the temperature difference Δ T0 is positive, the first condenser 7 is started before the current ventilation is completed, and if the temperature difference Δ T0 is negative, the first heater 6 is started before the current ventilation is completed. Wherein the start-in-advance of the first condenser 7 and the start-in-advance of the first condenser 7 may be performed according to a preset time value; or calculating the advance time according to the following formula and executing according to the calculation result: t1= a1 | Δ T0| + b1, T2= a2 | Δ T0| + b2, T1 is the advance time for the advance start of the first condenser 7, T2 is the advance time for the advance start of the first heater 6, and a1, b1, a2, b2 are preset calculation coefficients.

In practical applications, the first target thermometer is not limited to be the lowest value among the low temperature temperatures of the respective test chambers 3, and the second target thermometer is not limited to be the highest value among the high temperature temperatures of the respective test chambers 3; for example, the average of the low temperature of each test chamber 3 may be used as the first target temperature, and the average of the high temperature of each test chamber 3 may be used as the second target temperature.

In some preferred embodiments, there are two test chambers 3, so that the target temperature curves of the two test chambers 3 are obtained in step a 1; step a2 includes:

taking the target temperature curve of one test cavity 3 as a reference curve and the target temperature curve of the other test cavity 3 as an adjustment curve, and acquiring the optimal delay starting time of the adjustment curve relative to the reference curve; when the adjustment curves are started in a delayed manner according to the optimal delayed starting time, the time sum of the two target temperature curves in a high-low temperature opposite state (namely, one target temperature curve is in a high-temperature maintaining stage, and the other target temperature curve is in a low-temperature maintaining stage) is maximum;

delaying the starting time of the adjusting curve according to the optimal delay starting time;

and extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity according to the reference curve and the adjustment curve of the delayed starting time.

For example, the target temperature curve a and the target temperature curve b shown in fig. 3 are based on the target temperature curve a, and are adjusted according to the target temperature curve b, before adjustment, the temperature decreasing time point of the target temperature curve a is (2 k-1) × t1, the temperature increasing time point is 2k × t1, the temperature decreasing time point of the target temperature curve b is (2 k-1) × t2, and the temperature increasing time point is 2k × t2, where k =1, 2 … … n; assuming that t1= t2, the target temperature curve a and the target temperature curve b are always kept in the high temperature keeping stage or in the low temperature keeping stage at the same time, and therefore, the high temperature gas storage chamber 4 and the low temperature gas storage chamber 5 are always kept in the lowest pressure state or the highest pressure state, which greatly reduces the service life of the apparatus. The adjusted state is shown in fig. 4, at this time, the optimal delayed starting time dt = t1= t2, the test chamber 3 corresponding to the target temperature curve a is started first during the test, and the test chamber 3 corresponding to the target temperature curve b is started after the delay dt, so that the adjusted target temperature curve b and the target temperature curve a keep a high-low temperature opposite state, when one test chamber 3 is in a high-temperature keeping stage, the other test chamber 3 is in a low-temperature keeping state, so that the high-temperature gas storage chamber 4 and the low-temperature gas storage chamber 5 can keep a normal pressure state for a long time, and the service life of the device is prevented from being influenced.

Therefore, by delaying the start of one of the test chambers 3 according to the optimal delay start time, the sum of the times that the two test chambers 3 are in the high-temperature and low-temperature opposite states can be maximized, so that the sum of the times that the high-temperature gas storage chamber 4 and the low-temperature gas storage chamber 5 are kept in the normal pressure state is maximized, which is beneficial to reducing the adverse effect on the service life of equipment.

In practical applications, the high temperature holding time and the low temperature holding time of the two target temperature curves are not necessarily equal, and the optimal delayed start time of the adjustment curve relative to the reference curve can be obtained by:

gradually increasing the delay start time (starting from the delay start time being zero) by a preset step length, and calculating the time sum of the two target temperature curves in the opposite high-low temperature state after increasing the delay start time each time;

subtracting the time sum obtained by the last calculation from the time sum obtained by the current calculation to obtain the current time deviation;

and if the current time deviation is less than zero and the last time deviation obtained by calculation is greater than or equal to zero, subtracting the preset step length from the current delay starting time to obtain the optimal delay starting time.

The preset step length may be a preset fixed step length, or a preset percentage of the minimum value of the high temperature holding time or the low temperature holding time of the two target temperature curves.

Preferably, the high and low temperature test chamber control method further includes the steps of:

acquiring external environment temperature data, air temperature data of the low-temperature gas storage cavity 5 and air temperature data of the high-temperature gas storage cavity 4;

if the external ambient temperature is lower than the air temperature of the low-temperature gas storage chamber 5, opening the electric compartment door 22 of the low-temperature gas storage chamber 5;

if the outside ambient temperature is higher than the air temperature of the high temperature gas storage chamber 4, the power compartment door 22 of the high temperature gas storage chamber 4 is opened.

In practical application, if the temperature of the outside air is low (for example, in winter in a high-altitude area, the temperature of the outside air is low), so that the temperature of the outside air is lower than the air temperature of the low-temperature gas storage cavity, the outside air can be directly used as a cold air source, so that the electric cabin door 22 of the low-temperature gas storage cavity 5 is opened, the outside air can enter the low-temperature gas storage cavity 5, the temperature of the low-temperature gas storage cavity 5 is rapidly reduced, and electric energy can be saved; if the temperature of outside air is higher (for example, in summer in a low latitude area, the temperature of the outside air is higher), so that when the temperature of the outside air is higher than the air temperature of the high-temperature gas storage cavity 4, the outside air can be directly used as a hot air source, the electric cabin door 22 of the high-temperature gas storage cavity 4 is opened, the outside air can enter the high-temperature gas storage cavity 4, the temperature of the high-temperature gas storage cavity 4 is rapidly increased, and electric energy can be saved.

Wherein, if the external environment temperature is lower than the minimum value of the low temperature temperatures, the electric compartment door 22 of the low temperature gas storage cavity 5 can be kept open all the time; otherwise, the electric hatch 22 of the low temperature gas storage chamber 5 may be closed after the temperature of the low temperature gas storage chamber 5 deviates from the external ambient temperature by a preset temperature deviation range (e.g., -5 ℃ to 5 ℃). So that the temperature of the cryogenic gas storage chamber 5 can be ensured to reach the first target temperature under the action of the second condenser 16 while ensuring that the cryogenic gas storage chamber 5 is rapidly desuperheated.

Wherein, if the external environment temperature is higher than the maximum value of each high temperature, the electric cabin door 22 of the high temperature gas storage cavity 4 can be kept open all the time; otherwise, the electric hatch 22 of the high-temperature gas storage chamber 4 may be closed after the deviation between the temperature of the high-temperature gas storage chamber 4 and the external environment temperature reaches a preset temperature deviation range (e.g., -5 ℃ to 5 ℃). So that the temperature of the high-temperature gas storage chamber 4 can be ensured to reach the second target thermometer by the second heater 15 while the high-temperature gas storage chamber 4 is ensured to be rapidly warmed up.

In some preferred embodiments, the high and low temperature test chamber control method further includes the steps of:

acquiring pressure data of the low-temperature gas storage cavity 5 and pressure data of the high-temperature gas storage cavity 4;

if the pressure of the low-temperature gas storage cavity 5 exceeds a preset pressure threshold, opening the electric cabin door 22 of the low-temperature gas storage cavity 5 for pressure relief;

and if the pressure of the high-temperature gas storage cavity 4 exceeds a preset pressure threshold value, opening the electric cabin door 22 of the high-temperature gas storage cavity 4 for pressure relief.

During the pressure relief, if the pressure drops to a preset proportion (for example, 80%) of the preset pressure threshold, the corresponding electric compartment door 22 is closed to stop the pressure relief. The pressure relief can avoid the phenomenon that the pressure is too high to damage equipment or cause accidents.

In addition, when the low-temperature gas storage chamber 5 (or the high-temperature gas storage chamber 4) needs to be depressurized, the high-temperature gas storage chamber 4 (or the low-temperature gas storage chamber 5) can be in a high vacuum state, and the depressurization can cause the total air amount in the system to be reduced, so that the air amount is insufficient, and therefore, the electric compartment door 22 of the high-temperature gas storage chamber 4 (or the low-temperature gas storage chamber 5) needs to be opened for air supplement, wherein when the air supplement is carried out, the two electric compartment doors 22 are kept to be opened and closed synchronously, so that the air inflow and the air exhaust are ensured to be basically equal.

In the control method of the high-low temperature test chamber, the target temperature curve of each test cavity 3 is obtained; extracting the cooling time point, the corresponding low temperature, the heating time point and the corresponding high temperature of each test cavity 3 according to the target temperature curve; when the experiment time reaches the temperature reduction time point, pumping the air of the corresponding test cavity 3 into the high-temperature gas storage cavity 4, sending the air in the low-temperature gas storage cavity 5 into the corresponding test cavity 3, and adjusting the air temperature of the corresponding test cavity 3 to the corresponding low-temperature through the corresponding first heater 6 and the corresponding first condenser 7; when the experiment time reaches the temperature rise time point, pumping the air of the corresponding test cavity 3 into the low-temperature gas storage cavity 5, sending the air in the high-temperature gas storage cavity 4 into the corresponding test cavity 3, and adjusting the air temperature of the corresponding test cavity 3 to the corresponding high-temperature through the corresponding first heater 6 and the corresponding first condenser 7; thereby not only saving electric energy, but also realizing rapid temperature rise and fall.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, which are substantially the same as the present invention.