CN113262827A - High-low temperature test box with automatic dehumidification system and use method thereof - Google Patents
High-low temperature test box with automatic dehumidification system and use method thereof Download PDFInfo
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- CN113262827A CN113262827A CN202110395017.1A CN202110395017A CN113262827A CN 113262827 A CN113262827 A CN 113262827A CN 202110395017 A CN202110395017 A CN 202110395017A CN 113262827 A CN113262827 A CN 113262827A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/50—Enclosures; Chambers for storing hazardous materials in the laboratory, e.g. cupboards, waste containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L99/00—Subject matter not provided for in other groups of this subclass
Abstract
The invention relates to a temperature control test technology of a high-low temperature test box, in particular to a high-low temperature test box with an automatic dehumidification system and a method, and aims to solve the problems that when the existing product to be tested is subjected to a temperature test in the high-low temperature test box, a large amount of dry air or nitrogen needs to be introduced repeatedly, the operation is complicated, the labor is consumed, and the cost of test gas is high. The technical scheme adopted by the invention is as follows: a high-low temperature test chamber with an automatic dehumidification system comprises a high-low temperature test chamber, a temperature and humidity sensor, a balance hole arranged on the high-low temperature test chamber and the automatic dehumidification system, wherein the temperature and humidity sensor is arranged on the high-low temperature test chamber; the automatic dehumidification system comprises a first main gas path, a second branch gas path and a controller; the air outlet ports of the first main air path, the second main air path and the second branch air path are communicated with the air inlet of the high-low temperature test box; the invention also provides a use method of the high-low temperature test box with the automatic dehumidification system.
Description
Technical Field
The invention relates to a temperature control test technology of a high-low temperature test chamber, in particular to a high-low temperature test chamber with an automatic dehumidification system and a using method thereof.
Background
When a product to be tested is subjected to a temperature test in a high and low temperature test box for compressor refrigeration, high and low temperature tests are required to be performed on various products according to the requirements of reliability tests so as to check whether the functions and performances of the product in a high and low temperature environment can meet the design requirements. When the temperature of the high-low temperature test rises from low temperature, the temperature of the product to be tested rises slower than the air temperature of the high-low temperature test box.
When the air temperature in the high-low temperature test box is higher than 0 ℃, if the temperature of the product to be tested is lower than the dew point temperature, the water vapor in the test box can be condensed on the surface of the product to be tested to generate condensation; if the temperature of the product to be measured is lower than 0 ℃, frost will be generated. When the heating rate is high, the temperature difference between the product to be tested and the air temperature in the high-low temperature test box is larger, and the problem of frosting and dewing is more obvious.
The main method for reducing the risk of frosting and dewing of the product is to control the moisture content in the test chamber. Measures are generally taken from the following two aspects.
(1) Prior to testing, the humidity within the chamber is typically reduced by baking the chamber at high temperatures or by using a nitrogen/dry air displacement.
(2) After the proof box starts, along with rising temperature and cooling in the proof box, the air can carry out the air exchange with external atmosphere through the balanced mouth of proof box along with expend with heat and contract with cold in the proof box, and at this in-process, the vapor in the external atmosphere can be brought into in the proof box. When the temperature of the test chamber rises, the introduction amount of nitrogen/dry air needs to be increased, and the water vapor is accelerated to be discharged out of the test chamber. When the test chamber is cooled, the volume of air in the chamber is reduced, and the introduction amount of nitrogen/dry air needs to be increased to prevent outside air from entering the test chamber. When the test box is kept at high temperature or low temperature, a small amount of nitrogen/dry air needs to be continuously introduced, the micro-positive pressure environment in the test box is kept, and external water vapor is prevented from entering the test box.
The two measures need to be carried out in a large amount of dry air or nitrogen, particularly in a temperature test, a large amount of tests are carried out by high-low temperature circulation from 6.5 circulation to 25.5 circulation, the test period is as long as several days to more than ten days, the personnel operation is very frequent, the labor cost is increased, and the test efficiency is reduced; if the operator does not interfere with the ventilation of the test box, the high-pressure (large-flow) ventilation is adopted for the test box for a long time, the cost of the gas for the test is greatly increased, and the long-term implementation is difficult.
Disclosure of Invention
The invention provides a high-low temperature test chamber with an automatic dehumidification system and a using method thereof, aiming at solving the problems that a large amount of dry air or nitrogen needs to be repeatedly introduced when a product to be tested is subjected to a temperature test in the high-low temperature test chamber, the operation is complicated, the labor is consumed, and the cost of test gas is high.
The technical scheme adopted by the invention is as follows:
the utility model provides a take automatic dehumidification system's high low temperature test case, includes high low temperature test case, sets up the temperature and humidity sensor in high low temperature test case to and set up the balance hole on high low temperature test case, its special character lies in: the automatic dehumidification system is also included;
the automatic dehumidification system comprises a first main gas path, a second branch gas path and a controller; the air outlet ports of the first main air path, the second main air path and the second branch air path are communicated with the air inlet of the high-low temperature test box;
a first air inlet port of the first main air path is externally connected with high-pressure nitrogen, and a first pressure regulating valve and a first electromagnetic valve are sequentially arranged on the first main air path along the air conveying direction;
a second air inlet port of the second main air path is externally connected with high-pressure dry air or high-pressure nitrogen, and a second pressure regulating valve and a second electromagnetic valve are sequentially arranged on the second main air path along the air conveying direction;
the air inlet of the second branch air passage is communicated with a second air inlet port, and a third pressure regulating valve is arranged on the second branch air passage;
the first pressure regulating valve and the second pressure regulating valve are both high-pressure regulating valves; the third pressure regulating valve is a low-pressure regulating valve;
the first electromagnetic valve, the second electromagnetic valve and the temperature and humidity sensor are all electrically connected with the controller.
Further, the pressure of the gas connected into the first gas inlet port and the second gas inlet port is not less than 0.7 MPa.
Further, the temperature measurement range of the temperature and humidity sensor is-70 ℃ to 150 ℃.
Further, the humidity measurement range of the temperature and humidity sensor is 0% RH-98% RH.
Furthermore, the dew point temperature of the drying air is not more than-50 ℃, and the lower the dew point temperature is, the lower the water vapor content is, so that the dehumidification in the high-low temperature test box is more facilitated.
Meanwhile, the invention also provides a use method of the high-low temperature test box with the automatic dehumidification system, which is characterized by comprising the following steps:
step (1) assembling high-low temperature test box
Setting a humidity set value and a temperature change rate set value of the controller, and communicating the second air inlet port with dry air or nitrogen to enable the dry air or nitrogen to enter the high-low temperature test chamber through a second branch air path at low pressure;
step (2) dehumidification of high-low temperature test chamber
The temperature and humidity sensor collects the humidity value in the high and low temperature test box and compares the humidity value with a humidity set value;
if the humidity value is less than or equal to the humidity set value, executing the step (3);
if the humidity value is larger than the humidity set value, opening a second electromagnetic valve, enabling a part of dry air or nitrogen to enter a high-low temperature test box through a second main air path at high pressure, enabling the other part of dry air or nitrogen to enter the high-low temperature test box through a second branch air path at low pressure, closing the second electromagnetic valve until the humidity value is smaller than or equal to the humidity set value, and executing the step (3);
step (3) testing of the product to be tested
Step (3.1), putting a product to be tested into a high-low temperature test box, and carrying out a heating or cooling test on the product to be tested;
step (3.2) the temperature and humidity sensor collects the temperature change rate in the high and low temperature test box, and compares the temperature change rate with the temperature change rate set value;
if the temperature change rate is larger than the temperature change rate set value, opening a second electromagnetic valve, and simultaneously introducing dry air or nitrogen into the high-low temperature test chamber through a second main gas path and a second branch gas path;
when the temperature change rate is less than or equal to the temperature change rate set value, the second electromagnetic valve is closed, and dry air or nitrogen continuously enters the high-low temperature test box through the second branch gas circuit at low pressure, so that the high-low temperature test box is at micro positive pressure during temperature maintenance, and water vapor in the outside air is prevented from entering the test box;
when a product to be tested is heated or cooled, the temperature and humidity sensor collects the humidity value and the temperature change rate in real time, if the humidity value is larger than the humidity set value at any moment or/and the temperature change rate is larger than the temperature change rate set value, the second electromagnetic valve is opened until the humidity value is smaller than or equal to the humidity set value and the temperature change rate is smaller than or equal to the temperature change rate set value, the second electromagnetic valve is closed, and quick dehumidification is achieved.
Further, in the step (2), when the second electromagnetic valve is opened, the first air inlet port can be communicated with nitrogen at the same time, the first electromagnetic valve is opened, and the nitrogen enters the high-low temperature test box through the first main air path at high pressure, so that the dehumidification rate is improved; when the second electromagnetic valve is closed, the first electromagnetic valve is closed at the same time.
Compared with the prior art, the invention has the following beneficial effects.
The high-low temperature test box with the automatic dehumidification system is simple in structure and easy and convenient to operate, and before a test, the high-low temperature test box can be quickly realized by introducing high-pressure nitrogen or high-pressure dry air into the high-low temperature test box for replacement dehumidification; after the test starts, ventilate to high low temperature proof box through two gas circuits of high-low pressure, the low pressure gas circuit can be used to the pressure-fired that the temperature kept the in-process and maintain, and high-pressure gas circuit lets in large-traffic dry air or nitrogen gas at the cooling and heating process, reduces the temperature change rate, has avoided the problem that the product that awaits measuring frosted the dewfall, and then has realized the dry dehumidification of high low temperature proof box multiplex condition, but wide application in all compressor refrigerated high low temperature proof boxes.
According to the high-low temperature test box with the automatic dehumidification system, the controller is used for regulating and controlling the electromagnetic valve and the temperature and humidity sensor, quantitative measurement can be achieved, the humidity and temperature change rate in the high-low temperature test box can be automatically controlled, effective control of moisture in the test box by high and low temperatures is achieved, the cost of gas utilization is not increased, manpower is liberated, and the safety of tests is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a high-low temperature test chamber with an automatic dehumidification system according to the present invention.
In the figure:
the gas-liquid separation device comprises a gas inlet port 1, a first gas inlet port 2, a second gas inlet port 3, a first pressure regulating valve 4, a second pressure regulating valve 5, a third pressure regulating valve 6, a first electromagnetic valve 7, a second electromagnetic valve 8, a temperature and humidity sensor 9, a balance hole 10, a high and low temperature test box 11, a controller 12, a first main gas path 13, a second main gas path 14 and a second branch gas path 14.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments do not limit the present invention.
As shown in fig. 1, the high-low temperature test chamber with an automatic dehumidification system in this embodiment includes a high-low temperature test chamber 10, a temperature and humidity sensor 8 disposed in the high-low temperature test chamber 10, and a balance hole 9 disposed on the high-low temperature test chamber 10, and further includes an automatic dehumidification system;
the automatic dehumidification system comprises a first main gas path 12, a second main gas path 13, a second branch gas path 14 and a controller 11; the air outlet ports of the first main air path 12, the second main air path 13 and the second branch air path 14 are all communicated with the air inlet of the high-low temperature test box 10;
a first air inlet port 1 of the first main air path 12 is externally connected with high-pressure nitrogen, and the first main air path 12 is sequentially provided with a first pressure regulating valve 3 and a first electromagnetic valve 6 along the air transmission direction;
a second air inlet port 2 of the second main air path 13 is externally connected with high-pressure dry air or high-pressure nitrogen, and the second main air path 13 is sequentially provided with a second pressure regulating valve 4 and a second electromagnetic valve 7 along the air transmission direction;
an air inlet of the second branch air path 14 is communicated with the second air inlet port 2, and a third pressure regulating valve 5 is arranged on the second branch air path 14;
the first pressure regulating valve 3 and the second pressure regulating valve 4 are both high-pressure regulating valves; the third pressure regulating valve 5 is a low-pressure regulating valve; the adjusting pressure range of the high-pressure adjusting valve is 0.4-0.6 Mpa; the adjusting pressure range of the low-pressure adjusting valve is 0.1-0.15 Mpa; the pressure of each air path is adjusted by the pressure adjusting valve.
The first electromagnetic valve 6, the second electromagnetic valve 7 and the temperature and humidity sensor 8 are electrically connected with the controller 11 and are used for controlling the opening and closing of the electromagnetic valves, setting the temperature and setting the temperature change rate; the set value of the humidity of the controller is small and can be set to 5% RH, otherwise, the effective control of the humidity cannot be realized, and the temperature change rate of the controller is slightly smaller than the set rate of the high-temperature and low-temperature tests and can be set according to the actual working conditions of the tests.
The pressure of the gas connected into the first gas inlet port 1 and the second gas inlet port 2 is 1 MPa.
The temperature measurement range of the temperature and humidity sensor 8 is-70-150 ℃; the humidity measurement range of the temperature and humidity sensor 8 is 0% RH to 98% RH.
The dew point temperature of the dry air is-75 ℃, and the lower the dew point temperature is, the lower the water vapor content is, and the dehumidification in the high-low temperature test box is more facilitated.
Meanwhile, the invention also provides a use method of the high-low temperature test box with the automatic dehumidification system, which comprises the following steps:
step (1) assembling high-low temperature test box
Setting a humidity set value and a temperature change rate set value of a controller 11, communicating the second air inlet port 2 with dry air, enabling the dry air to enter the high-low temperature test box 10 through a second branch air path 14 at low pressure, and discharging the dry air through the balance hole 9;
step (2) dehumidification of high-low temperature test chamber
The temperature and humidity sensor 8 collects the humidity value in the high-low temperature test chamber 10 and compares the humidity value with a humidity set value;
if the humidity value is less than or equal to the humidity set value, executing the step 3;
if the humidity value is larger than the humidity set value, opening the second electromagnetic valve 7, enabling a part of dry air to enter the high-low temperature test box 10 through the second main air path 13 at high pressure, enabling the other part of dry air to enter the high-low temperature test box 10 through the second branch air path 14 at low pressure, closing the second electromagnetic valve 7 until the humidity value is smaller than or equal to the humidity set value, and executing the step 3;
step (3) testing of the product to be tested
Step (3.1) putting a product to be tested into a high-low temperature test box 10, and carrying out a heating or cooling test on the product to be tested;
step (3.2) the temperature and humidity sensor 8 collects the temperature change rate in the high and low temperature test chamber 10, and compares the temperature change rate with the temperature change rate set value;
if the temperature change rate is larger than the temperature change rate set value, the second electromagnetic valve 7 is opened, the second main air path 13 and the second branch air path 14 simultaneously introduce dry air into the high-low temperature test box 10, the dry air in the second branch air path 14 is low-pressure air inflow and used for micro-positive pressure maintenance in the temperature keeping process, and the dry air in the second main air path 13 is high-pressure air inflow and used for introducing large-flow dry air in the temperature rising and falling process to reduce the temperature change rate.
When the temperature change rate is less than or equal to the temperature change rate set value, the second electromagnetic valve 7 is closed, and the dry air continuously enters the high-low temperature test box 10 through the second branch air passage 14 at low pressure, so that the high-low temperature test box 10 is at micro positive pressure during temperature maintenance, and the water vapor in the outside air is prevented from entering the test box 10;
when a product to be tested is heated or cooled, the temperature and humidity sensor 8 collects the humidity value and the temperature change rate in real time, if the humidity value is larger than the humidity set value at any moment or/and the temperature change rate is larger than the temperature change rate set value, the second electromagnetic valve 7 is opened until the humidity value is smaller than or equal to the humidity set value and the temperature change rate is smaller than or equal to the temperature change rate set value, the second electromagnetic valve 7 is closed, and quick dehumidification is achieved.
In this embodiment, in step (1), when the dehumidification requirement is higher, avoid the influence of a small amount of steam in the dry air promptly, second inlet port 2 still can select and communicate with nitrogen gas, uses the pressure nitrogen gas to ensure the pressure-fired pressure that the temperature kept the process, uses high pressure nitrogen gas to reduce the temperature rate of change in high low temperature test box 10, adopts high pressure (large-traffic) nitrogen gas to dehumidify in the test box at the lift warm in-process simultaneously.
In the step (2), in order to realize better dehumidification rate, the second electromagnetic valve 7 is opened, high-pressure (large-flow) dry air or nitrogen is introduced into the high-low temperature test chamber 10, the first air inlet port 1 can be communicated with the nitrogen at the same time, the first electromagnetic valve 6 is opened, and high-pressure (large-flow) nitrogen is introduced into the high-low temperature test chamber 10 at the same time; when the second solenoid valve 7 is closed, the first solenoid valve 6 is closed at the same time.
The on-off of the second main gas circuit 13 and the second branch gas circuit 14 is controlled by the controller 11, the controller 11 takes the humidity and the temperature change rate in the high-low temperature test box 10 as feedback, when dehumidification needs to be performed rapidly, the controller 11 drives the electromagnetic valve to be opened to realize the introduction of nitrogen or dry air, and when the temperature change rate is high, the electromagnetic valve is controlled to be opened to realize the automatic introduction of large-flow nitrogen or dry air.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The utility model provides a take automatic dehumidification system's high low temperature test case, includes high low temperature test case (10), temperature and humidity sensor (8) of setting in high low temperature test case (10) to and balance hole (9) of setting on high low temperature test case (10), its characterized in that: the automatic dehumidification system is also included;
the automatic dehumidification system comprises a first main air path (12), a second main air path (13), a second branch air path (14) and a controller (11); the air outlet ports of the first main air path (12), the second main air path (13) and the second branch air path (14) are communicated with the air inlet of the high-low temperature test box (10);
a first air inlet port (1) of the first main air path (12) is externally connected with high-pressure nitrogen, and a first pressure regulating valve (3) and a first electromagnetic valve (6) are sequentially arranged on the first main air path (12) along the air transmission direction;
a second air inlet port (2) of the second main air path (13) is externally connected with high-pressure dry air or high-pressure nitrogen, and a second pressure regulating valve (4) and a second electromagnetic valve (7) are sequentially arranged on the second main air path (13) along the air transmission direction;
an air inlet of the second branch air path (14) is communicated with the second air inlet port (2), and a third pressure regulating valve (5) is arranged on the second branch air path (14);
the first pressure regulating valve (3) and the second pressure regulating valve (4) are both high-pressure regulating valves; the third pressure regulating valve (5) is a low-pressure regulating valve;
the first electromagnetic valve (6), the second electromagnetic valve (7) and the temperature and humidity sensor (8) are electrically connected with the controller (11).
2. The high-low temperature test chamber with automatic dehumidification system according to claim 1, wherein: the pressure of the gas connected into the first gas inlet port (1) and the second gas inlet port (2) is not less than 0.7 MPa.
3. The high-low temperature test chamber with automatic dehumidification system according to claim 2, wherein: the temperature measurement range of the temperature and humidity sensor (8) is-70-150 ℃.
4. High-low temperature test chamber with automatic dehumidification system according to any of claims 1 to 3, characterized in that: the humidity measuring range of the temperature and humidity sensor (8) is 0-98% RH.
5. The high-low temperature test chamber with automatic dehumidification system according to claim 4, wherein: the dew point temperature of the drying air is not more than-50 ℃.
6. The use method of the high-low temperature test chamber with the automatic dehumidification system is characterized by comprising the following steps of:
step (1) assembling high-low temperature test box
Setting a humidity set value and a temperature change rate set value of a controller (11), and communicating the second air inlet port (2) with dry air or nitrogen to enable the dry air or nitrogen to enter the high-low temperature test box (10) through a second branch air path (14) at low pressure;
step (2) dehumidification of high-low temperature test chamber
The temperature and humidity sensor (8) collects the humidity value in the high-low temperature test box (10) and compares the humidity value with a humidity set value;
if the humidity value is less than or equal to the humidity set value, executing the step (3);
if the humidity value is larger than the humidity set value, opening a second electromagnetic valve (7), enabling a part of dry air or nitrogen to enter a high-low temperature test box (10) through a second main gas path (13) at high pressure, enabling the other part of dry air or nitrogen to enter the high-low temperature test box (10) through a second branch gas path (14) at low pressure, closing the second electromagnetic valve (7) until the humidity value is smaller than or equal to the humidity set value, and executing the step (3);
step (3) testing of the product to be tested
Step (3.1) putting a product to be tested into a high-low temperature test box (10), and carrying out a heating or cooling test on the product to be tested;
step (3.2) the temperature and humidity sensor (8) collects the temperature change rate in the high-low temperature test box (10), and compares the temperature change rate with the temperature change rate set value;
if the temperature change rate is larger than the temperature change rate set value, opening a second electromagnetic valve (7), and simultaneously introducing dry air or nitrogen into the high-low temperature test chamber (10) through a second main gas path (13) and a second branch gas path (14);
when the temperature change rate is less than or equal to the temperature change rate set value, the second electromagnetic valve (7) is closed, and dry air or nitrogen continuously enters the high-low temperature test box (10) through the second branch gas path (14) at low pressure, so that the interior of the high-low temperature test box (10) is at micro-positive pressure during temperature maintenance;
when a product to be measured is heated or cooled, the temperature and humidity sensor (8) collects the humidity value and the temperature change rate in real time, if the humidity value is larger than the humidity set value at any moment or/and the temperature change rate is larger than the temperature change rate set value, the second electromagnetic valve (7) is opened until the humidity value is smaller than or equal to the humidity set value and the temperature change rate is smaller than or equal to the temperature change rate set value, and the second electromagnetic valve (7) is closed.
7. The use method of the high-low temperature test chamber with the automatic dehumidification system according to claim 6, wherein: in the step (2), when the second electromagnetic valve (7) is opened, the first air inlet port (1) can be communicated with nitrogen at the same time, the first electromagnetic valve (6) is opened, and the nitrogen enters the high-low temperature test chamber (10) through the first main air path (12) at high pressure; when the second electromagnetic valve (7) is closed, the first electromagnetic valve (6) is closed at the same time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114362072A (en) * | 2021-12-09 | 2022-04-15 | 贵州电网有限责任公司 | Dehumidification device and method for transformer substation terminal box in high corrosion area |
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Application publication date: 20210817 |