System for automatically identifying temperature and humidity test box and controlling conductivity of test water

Abstract

The utility model relates to the technical field of automatic control equipment, in particular to a system for a temperature and humidity test box to automatically identify and control conductivity of test water, which comprises a temperature and humidity test box internally provided with a water tank; the pure water filter is used for providing test water for the water tank; the control instrument is in signal connection with the sensors and the executing mechanism; the water level sensor is used for detecting a water level signal and transmitting the water level signal to the controller; the conductivity sensor is used for detecting a conductivity signal and transmitting the conductivity signal to the controller; the water inlet electromagnetic valve is connected to the water inlet pipe between the pure water filter and the water tank; the drainage electromagnetic valve is connected to a drainage pipe near the bottom of the water tank; and the data display is used for displaying the conductivity value and the water feeding and discharging state in real time, so that the effects of monitoring the conductivity in the test water in time and avoiding inaccurate temperature and humidity measurement of an electronic product are achieved.

Description

Technical Field

[0001] This application relates to the field of automatic control equipment technology, and in particular to a system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber. Background Technology

[0002] With increasingly stringent performance requirements for electronic products, temperature and humidity test chambers, as core equipment for reliability testing, directly impact product quality assessment through their testing accuracy. The conductivity of the test water needs to be controlled below 20 μS / cm to avoid interference from water impurities on temperature and humidity uniformity, condensation, or corrosive gases. However, the conductivity of the test water gradually increases due to environmental exposure, equipment operation, or microbial growth. Exceeding the threshold can lead to distorted test data and even affect the accuracy of product lifespan assessment. Therefore, achieving precise conductivity control has become a key technical challenge in the field of temperature and humidity testing.

[0003] Currently, the management of the conductivity of test water in temperature and humidity test chambers mainly relies on manual operation. The specific process includes: periodically measuring the water quality in the tank using a handheld conductivity meter, and determining whether to replace the test water or clean the tank based on the test results.

[0004] The existing technical solutions mentioned above have the following drawbacks: the measurement frequency is manually controlled, which may lead to the failure to replace the test water in time when the conductivity of the test water deviates due to untimely measurement, thus resulting in inaccurate temperature and humidity measurements of electronic products. Utility Model Content

[0005] In order to achieve timely monitoring of the conductivity of the test water and avoid inaccurate temperature and humidity measurements of electronic products, this application provides a system for automatically identifying and controlling the conductivity of the test water in a temperature and humidity test chamber.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber includes:

[0008] Temperature and humidity test chamber, which has a water tank inside;

[0009] A pure water filter is used to supply test water with a conductivity ≤20μS / cm to the water tank;

[0010] The controller is connected to the signals of various sensors and actuators;

[0011] A water level sensor, located in the upper part of the water tank, is used to detect the water level signal and transmit it to the controller.

[0012] A conductivity sensor is installed in the lower part of the water tank to detect conductivity signals and transmit them to the controller;

[0013] The inlet solenoid valve is connected to the inlet pipe between the pure water filter and the water tank;

[0014] The drain solenoid valve is connected to the drain pipe near the bottom of the water tank;

[0015] Data display, used to show conductivity values ​​and inlet / outlet status in real time.

[0016] By adopting the above scheme, the pure water filter is used to supply test water to the water tank. When the conductivity sensor detects an abnormal conductivity of the test water in the tank, it will transmit a signal to the controller. The controller will then activate the drain solenoid valve until the water level sensor drains the water in the tank and transmits the signal to the controller. The controller will then close the drain control valve and open the inlet control valve to drain water into the tank until the water level sensor senses that the water level is sufficient and the conductivity sensor senses that the conductivity is ≤20μS / cm, thus completing the water replacement operation. Compared with the existing method of manually measuring water quality and manually controlling the measurement frequency, this method achieves timely monitoring of the conductivity in the test water and avoids inaccurate temperature and humidity measurements for electronic products.

[0017] Furthermore, the controller is configured to: open the water inlet solenoid valve to replenish water when the water level sensor detects that the water tank is short of water; and close the water inlet solenoid valve when the water level sensor detects that the water tank is full of water.

[0018] Furthermore, the feature is that: when the conductivity sensor detects a conductivity > 20 μS / cm, the drain solenoid valve is opened to drain the test water; after the drainage is completed, the inlet solenoid valve is automatically opened to replenish the water.

[0019] Furthermore, the feature is that the drain pipe of the drain solenoid valve is installed close to the bottom of the water tank, ensuring that impurities at the bottom of the tank can be discharged simultaneously during drainage.

[0020] Furthermore, the feature is that the installation positions of the water level sensor and the conductivity sensor form a clamping control zone, so that the water level in the water tank is always maintained between the two sensors.

[0021] Furthermore, the feature is that the inlet end of the pure water filter is connected to a tap water pipe, and the outlet end is connected to a water tank through an inlet solenoid valve.

[0022] Furthermore, the data display integrates an alarm module that triggers an audible and visual alarm when the conductivity exceeds the standard or the water level is abnormal.

[0023] Furthermore, the controller uses a PLC or embedded controller to implement automatic control logic.

[0024] In summary, this application has the following technical effects:

[0025] By setting up this system, the pure water filter is used to supply test water to the water tank. When the conductivity sensor detects an abnormal conductivity of the test water in the tank, it will transmit a signal to the controller. The controller will then activate the drain solenoid valve until the water level sensor drains the water in the tank and transmits a signal to the controller. The controller will then close the drain control valve and open the inlet control valve to drain water into the tank until the water level sensor senses that the water level is sufficient and the conductivity sensor senses that the conductivity is ≤20μS / cm, thus completing the water replacement operation. Compared with the existing method of manually measuring water quality and manually controlling the measurement frequency, this method achieves timely monitoring of the conductivity in the test water and avoids inaccurate temperature and humidity measurements for electronic products.

[0026] By setting up an alarm module, staff can be promptly alerted when the system's automatic water change operation malfunctions.

[0027] By installing a drain pipe and placing it near the bottom wall of the water tank, it is easy to drain the failed test water from the water tank. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the system used in this application for automatically identifying and controlling the conductivity of the test water in a temperature and humidity test chamber;

[0029] In the diagram, 1. Temperature and humidity test chamber; 2. Pure water filter; 3. Water tank; 4. Controller; 5. Water level sensor; 6. Conductivity sensor; 7. Inlet solenoid valve; 8. Drain solenoid valve; 9. Data display. Detailed Implementation

[0030] Reference Figure 1 The following description, in conjunction with the accompanying drawings, provides a more detailed explanation of this application.

[0031] The system provided in this embodiment for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber includes a temperature and humidity test chamber 1, wherein a water tank 3 is fixedly connected inside the temperature and humidity test chamber 1, and the water tank 3 contains test water.

[0032] A pure water filter 2 is connected to the water tank 3. The pure water filter 2 is connected to the water inlet of the water tank 3 through an inlet pipe. The pure water filter 2 is used to provide test water with a conductivity of ≤20μS / cm to the water tank 3 through the inlet pipe. A water inlet solenoid valve 7 is installed on the inlet pipe to control the opening and closing of the inlet pipe. Specifically, in this embodiment, the water inlet end of the pure water filter 2 is connected to a tap water pipe.

[0033] It should be noted that the pure water filter 2 mentioned in this application can be implemented using mature water treatment technologies commonly used in the field, such as reverse osmosis (RO), ion exchange, or electrodeionization (EDI). Its specific internal structure and working principle are common knowledge to those skilled in the art, and there are also a variety of standardized equipment that meet the requirements available on the market for direct selection. Therefore, it will not be described in detail in this application.

[0034] The side wall of water tank 3 is connected to a drain pipe, and a drain solenoid valve 8 is installed on the drain pipe to control the opening and closing of the drain pipe. The drain pipe is installed close to the bottom of water tank 3 to ensure that impurities at the bottom of the tank can be discharged simultaneously when draining; and the bottom of water tank 3 is designed with a 15° funnel-shaped slope to assist in the discharge of impurities.

[0035] A water level sensor 5 is installed in the upper middle part of the water tank 3 to detect the water level signal; a conductivity sensor 6 is also installed in the lower part of the water tank 3 to detect the conductivity signal; in this embodiment, the installation positions of the water level sensor 5 and the conductivity sensor 6 form a clamping control range, so that the water level in the water tank 3 is always maintained between the two.

[0036] The temperature and humidity test chamber 1 is equipped with a controller 4. The controller 4 is connected to the water level sensor 5, the conductivity sensor 6, the inlet solenoid valve 7, and the outlet solenoid valve 8. The outer wall of the temperature and humidity test chamber 1 is also fixedly connected to a data display 9, which is used to connect to the controller 4 to display the conductivity value and the inlet and outlet status in real time. The data display 9 also integrates an alarm module, which triggers an audible and visual alarm when the conductivity exceeds the standard or the water level is abnormal.

[0037] The controller 4 is configured to open the inlet solenoid valve 7 to replenish water when the water level sensor 5 detects that the water tank 3 is short of water; to close the inlet solenoid valve 7 when the water level sensor 5 detects that the water tank 3 is full; to open the drain solenoid valve 8 to drain the test water when the conductivity sensor 6 detects that the conductivity is >20μS / cm; and to automatically open the inlet solenoid valve 7 to replenish water after the drainage is completed.

[0038] In this embodiment, the controller 4 uses a PLC or embedded controller to implement the automatic control logic. It should be noted that using a PLC or embedded controller to build an automatic control system is a common technique in the field, and its specific selection, programming implementation, and hardware connection are all routine skills for technicians, so this application will not elaborate on them. The core innovation of this invention lies in how to use the controller to achieve specific control logic for water conductivity and system coordination, rather than the implementation method of the controller itself.

[0039] The specific implementation principle of the system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to this application embodiment is as follows: First, the system is started, and the controller 4 automatically opens the inlet solenoid valve 7. The pure water filter 2 begins to inject test water with a conductivity ≤20μS / cm into the water tank 3 through the inlet pipe. When the water level sensor 5 detects that the water level in the water tank 3 has reached the preset upper limit, the controller 4 immediately closes the inlet solenoid valve 7 to stop water replenishment. During continuous system operation, the controller 4 observes the water quality in real time through the conductivity sensor 6. When the conductivity is detected to be >20μS / cm, the controller 4 automatically opens the drain solenoid valve 8 to drain the sewage and impurities at the bottom of the water tank 3. When the water level drops to the installation height of the conductivity sensor 6 (clamping lower limit), the controller 4 opens the inlet solenoid valve 7 again to inject new water until the water level rises back to the position of the water level sensor 5 (clamping upper limit) and then closes the inlet valve, finally completing the water quality refresh. The entire process does not require manual intervention. If the conductivity exceeds the standard or the water level is abnormal, the data display 9 will trigger an audible and visual alarm to prompt maintenance.

[0040] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber, characterized in that: include: Temperature and humidity test chamber (1), which is equipped with a water tank (3); A pure water filter (2) is used to supply test water with a conductivity ≤20μS / cm to the water tank (3); The controller (4) is connected to the signals of each sensor and actuator; A water level sensor (5) is located in the upper part of the water tank (3) to detect water level signals and transmit them to the controller (4). A conductivity sensor (6) is located in the lower part of the water tank (3) to detect conductivity signals and transmit them to the controller (4). The inlet solenoid valve (7) is connected to the inlet pipe between the pure water filter (2) and the water tank (3); The drain solenoid valve (8) is connected to the drain pipe near the bottom of the water tank (3); Data display (9) is used to display conductivity values ​​and water inlet and outlet status in real time.

2. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 1, characterized in that: The controller (4) is configured as follows: When the water level sensor (5) detects that the water tank (3) is short of water, the water inlet solenoid valve (7) is opened to replenish water; When the water level sensor (5) detects that the water tank (3) is full, the water inlet solenoid valve (7) is closed.

3. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 2, characterized in that: When the conductivity sensor (6) detects a conductivity > 20 μS / cm, the drain solenoid valve (8) is opened to drain the test water; after the drainage is completed, the inlet solenoid valve (7) is automatically opened to replenish the water.

4. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 3, characterized in that: The drain pipe of the drain solenoid valve (8) is installed close to the bottom of the water tank (3) to ensure that impurities at the bottom of the tank are discharged simultaneously during drainage.

5. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 4, characterized in that: The installation positions of the water level sensor (5) and the conductivity sensor (6) form a clamping control zone, so that the water level in the water tank (3) is always maintained between the two sensors.

6. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 5, characterized in that: The water inlet of the pure water filter (2) is connected to the tap water pipe, and the water outlet is connected to the water tank (3) through the water inlet solenoid valve (7).

7. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to claim 6, characterized in that: The data display (9) is equipped with an alarm module that triggers an audible and visual alarm when the conductivity exceeds the standard or the water level is abnormal.

8. The system for automatically identifying and controlling the conductivity of test water in a temperature and humidity test chamber according to any one of claims 1-7, characterized in that: The controller (4) uses a PLC or embedded controller to implement automatic control logic.

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