Water level monitoring and alarming device for test pool

Abstract

The embodiment of the application discloses a water level monitoring and alarming device for a test pool, which comprises a power supply, a switch, at least one water level monitoring branch and a reference branch; each water level monitoring branch comprises a triode and an indicating device; the base of the triode is connected with a pool wall of a preset height in the test pool; the emitter of the triode is connected with the negative pole of the power supply; the collector of the triode is connected with the positive pole of the power supply through the indicating device; one end of the reference branch is connected with the bottom of the test pool and is always in contact with water, and the other end is connected with the positive pole of the power supply. The monitoring efficiency and accuracy are improved.

Description

Technical Field

[0001] This invention relates to the field of water level testing, and more particularly to a water level monitoring and alarm device for a test water tank. Background Technology

[0002] In various product testing scenarios, large or small test pools are widely used to simulate actual working conditions and test product performance. To ensure the safe and smooth conduct of the test, real-time monitoring of the pool water level is crucial; excessively high water levels may cause overflows, equipment damage, or even safety accidents.

[0003] However, existing water level monitoring methods still rely heavily on manual periodic inspections, which suffer from problems such as untimely monitoring, high labor costs, and the inability to achieve multi-level alarms. There is a lack of portable water level monitoring devices that are simple in structure, cost-controllable, and capable of automatic level alarms.

[0004] There is currently no effective solution to the above problems in existing technologies. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a water level monitoring and alarm device for a test pool. By setting multiple monitoring electrodes at different heights and a reference electrode that is always in contact with the water, the device utilizes the conductivity of the water to automatically turn on the transistors in the corresponding water level monitoring branches, thereby driving LEDs of different colors and buzzers to achieve graded alarms, thus replacing manual monitoring.

[0006] To achieve the above objectives, this invention provides a test water tank level monitoring and alarm device, comprising: a power supply, a switch, at least one water level monitoring branch and a reference branch; each water level monitoring branch includes a transistor and an indicator; the base of the transistor is connected to the tank wall at a preset height in the test water tank; the emitter of the transistor is connected to the negative terminal of the power supply; the collector of the transistor is connected to the positive terminal of the power supply through the indicator; one end of the reference branch is connected to the bottom of the test water tank and is always in contact with water, and the other end is connected to the positive terminal of the power supply.

[0007] Further optionally, the indicating device includes a light-emitting diode and / or a buzzer; the anode of the light-emitting diode is connected to the positive terminal of the power supply, and the cathode is connected to the collector of the transistor; the positive terminal of the buzzer is connected to the positive terminal of the power supply, and the negative terminal is connected to the collector of the transistor.

[0008] Further optionally, a current-limiting resistor is also included, which is connected in series between the collector of the light-emitting diode and the collector of the transistor.

[0009] Further optional features include three water level monitoring branches, each with a different preset height, used to monitor different water level thresholds.

[0010] Alternatively, the LEDs corresponding to different water level monitoring branches may have different light emission colors.

[0011] Alternatively, the switch is a rocker switch connected in series with the negative output terminal of the power supply.

[0012] Further optionally, it also includes a housing and a support plate; the power supply, switch, at least one water level monitoring branch and reference branch are disposed on a printed circuit board, and the printed circuit board is fixed to the support plate; the support plate is fixed to the inside of the housing by threaded parts.

[0013] Alternatively, the case is an aluminum alloy instrument case, and the case is equipped with a handle and a buckle.

[0014] The above technical solution has the following beneficial effects: by using the water body's conductivity to automatically control the switching of the transistor, real-time monitoring and automatic alarm of the water level in the pool are realized, thereby replacing manual inspection and saving labor costs; by setting multiple monitoring electrodes at different heights, different water level thresholds can trigger corresponding indicator devices in stages, thereby intuitively reflecting the water level change process and facilitating timely and targeted measures; by integrating the circuit into a portable case, the device is easy to carry and deploy on site, thereby improving the flexibility of use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the circuit structure of the test water tank water level monitoring and alarm device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the test water tank level monitoring and alarm device provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the housing structure of the test water level monitoring and alarm device provided in an embodiment of the present invention.

[0017] Attached reference numerals: 1-Power supply; 2-Switch; 3-Water level monitoring branch; 301-Transistor; 302-Indicator; 303-Current limiting circuit; 4-Reference branch; 5-Test water tank; 6-Box cover; 7-Lower box; 8-Snap fastener; 9-Handle; 10-Support plate; 11-Threaded part. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To address the problem of difficulty in automatically monitoring water levels in existing technologies, this invention provides a water level monitoring and alarm device for a test pool. Figure 1 This is a schematic diagram of the circuit structure of the test water tank water level monitoring and alarm device provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the device includes: a power supply 1, a switch 2, at least one water level monitoring branch 3 and a reference branch 4; each water level monitoring branch 3 includes a transistor 301 and an indicator 302; the base of the transistor is connected to the wall of the test water tank 5 at a preset height; the emitter of the transistor 301 is connected to the negative terminal of the power supply 1; the collector of the transistor 301 is connected to the positive terminal of the power supply 1 through the indicator 302; one end of the reference branch 4 is connected to the bottom of the test water tank 5 and is always in contact with water, and the other end is connected to the positive terminal of the power supply 1.

[0020] Power supply 1 provides operating power for the entire device, preferably using a 12V battery pack. It should be noted that since the power supply is a 12V battery pack, if the output voltage is insufficient and falls below the threshold voltage required for the transistor to conduct, the transistor will not conduct properly even if the water level reaches the preset height and the switch is closed. The indicating device will not issue an alarm signal. Therefore, ensure the battery pack is fully charged before use.

[0021] Switch 2 is connected in series with the output terminal of power supply 1 to control the power-on / off state of the device. When using the water level monitoring and alarm device for this test water tank, switch 2 must be closed first to put the device into working condition. Only then can each water level monitoring branch perform water level detection and alarm normally. If the switch is in the open state, the entire device will be powered off and the water level monitoring function will not be realized.

[0022] Each water level monitoring branch 3 includes a transistor 301 and an indicator 302. The base of the transistor 301 is connected to the wall of the test water tank 5 at a predetermined height. That is, this connection is achieved through an electrode pre-embedded at a specified height on the tank wall, which serves as the water level monitoring point. The emitter of the transistor 301 is connected to the negative terminal of the power supply 1, forming a common ground loop. The transistor used in this device is an NPN type. Its working principle is as follows: when the base voltage is about 0.7V higher than the emitter voltage, the transistor conducts, forming a path between the collector and emitter; conversely, the transistor is cut off, and the collector and emitter are disconnected. The collector of the transistor 301 is connected to the positive terminal of the power supply 1, and an indicator 302 is provided on this connection loop. Thus, the transistor 301 acts as a switching element, and the voltage level of its base determines the conduction and cutoff between the collector and emitter, thereby controlling the working state of the indicator 302.

[0023] One end of the reference branch 4 is connected to the bottom of the test water tank 5, and this end is always in contact with the water to ensure that it can maintain electrical connection with the water body at any water level; the other end of the reference branch 4 is connected to the positive terminal of the power supply 1. Thus, a potential conductive path is formed between the reference branch 4 and each water level monitoring branch 3 through the water body.

[0024] When the water level does not reach the preset height corresponding to a certain water level monitoring branch 3, the base of the transistor 301 in that branch cannot form a conductive circuit with the reference branch 4 through the water. The base is in a low-level state, the transistor 301 is cut off, and the indicating device 302 does not work. When the water level rises to reach the preset height, the water acts as a conductor, connecting the base of the water level monitoring branch 3 with the reference branch 4, causing the base to be connected to a high level. The transistor 301 conducts, forming a current path between the collector and emitter, thereby triggering the indicating device 302 to issue an alarm signal, realizing automatic water level monitoring and alarm.

[0025] With the above structure, the device combines the electrical conductivity of water with the switching characteristics of transistor 301, and can automatically and reliably achieve real-time monitoring and alarm of the water level in the test pool 5 without the need for complex control chips or manual intervention.

[0026] As an optional implementation, the indicator device 302 includes a light-emitting diode and / or a buzzer; the anode of the light-emitting diode is connected to the positive terminal of the power supply 1, and the cathode is connected to the collector of the transistor 301; the positive terminal of the buzzer is connected to the positive terminal of the power supply 1, and the negative terminal is connected to the collector of the transistor 301.

[0027] The indicator 302 is used to emit a perceptible alarm signal when the water level reaches a preset threshold, and its specific form can be flexibly configured according to alarm requirements. In this embodiment, the indicator 302 includes a light-emitting diode and / or a buzzer to realize light alarm and sound alarm functions, respectively.

[0028] When the indicator 302 uses a light-emitting diode (LED), the anode of the LED is connected to the positive terminal of power supply 1, and the cathode is connected to the collector of transistor 301. Thus, the LED is connected in series in the circuit between the positive terminal of power supply 1 and the collector of transistor 301. When transistor 301 is in the off state, the circuit is open, no current flows through the LED, and it does not emit light. When the water level rises, causing the base of transistor 301 to connect to a high level and transistor 301 to conduct, a low-resistance path is formed between the collector and emitter. Current flows from the positive terminal of power supply 1 through the LED to the collector of transistor 301, and then through the emitter to the negative terminal of power supply 1. The LED then conducts in the forward direction, converting electrical energy into light energy and emitting a visible light signal, thus providing a light alarm indication that the water level has reached a preset threshold.

[0029] When the indicating device 302 uses a buzzer, the positive terminal of the buzzer is connected to the positive terminal of power supply 1, and the negative terminal is connected to the collector of transistor 301. The buzzer is also connected in series in the circuit between the positive terminal of power supply 1 and the collector of transistor 301. In this embodiment, a piezoelectric buzzer is preferably used. Its working principle is as follows: when voltage is applied, the internal piezoelectric ceramic plate undergoes mechanical deformation, causing the metal plate to vibrate, thereby emitting sound. When transistor 301 is turned on, the buzzer receives a working voltage, and the piezoelectric ceramic plate vibrates to produce sound, realizing an audible alarm when the water level reaches a preset threshold. Compared to continuous sound, a buzzer provides a more significant warning effect, especially suitable for scenarios requiring timely attention from operators.

[0030] Furthermore, in the same water level monitoring branch 3, the LED and the buzzer can be connected in parallel, meaning their positive terminals are connected to the positive terminal of power supply 1, and their negative terminals are connected to the collector of transistor 301. When transistor 301 is turned on, both work simultaneously, achieving synchronized audible and visual alarm, further enhancing the intuitiveness and warning effect of the alarm. Different water level monitoring branches 3 can select and configure different combinations of indicator devices 302 according to different water level thresholds. For example, for lower water level thresholds, only LEDs are configured for graded visual alarms, while for the highest water level thresholds, both LEDs and buzzers are configured for enhanced alarms, thus forming a graded alarm mechanism.

[0031] When the water level does not reach the minimum water level threshold, the first electrode of each water level monitoring branch cannot form a path with the reference branch through the water conductor. The base of each transistor is in a low-level state, and the transistors are all cut off. The LEDs and buzzers do not form a working circuit, so no light alarm signal or sound alarm signal will be emitted.

[0032] As an optional implementation, a current-limiting resistor 303 is also included, which is connected in series between the light-emitting diode and the collector of the transistor 301.

[0033] During the operation of an LED, the voltage across its terminals is relatively stable when it is turned on, typically ranging from 1.8V to 3.3V, depending on the LED's color and model. If it is directly connected between the positive terminal of power supply 1 and the collector of transistor 301 without any current limiting measures, when transistor 301 is turned on, almost all of the voltage from power supply 1 will be applied across the LED. This may cause the current flowing through the LED to be excessive, exceeding its rated operating current (usually around 20mA), resulting in overheating, accelerated light decay, or even permanent damage to the LED.

[0034] To solve the above problems, this embodiment connects a current-limiting resistor 303 in series between the light-emitting diode and the collector of the transistor 301. One end of the current-limiting resistor 303 is connected to the cathode of the light-emitting diode, and the other end is connected to the collector of the transistor 301, so that the light-emitting diode and the current-limiting resistor 303 form a series branch, which is connected together between the positive terminal of the power supply 1 and the collector of the transistor 301.

[0035] The resistance value of the current-limiting resistor 303 is reasonably selected based on the voltage of power supply 1, the forward voltage drop of the LED, and the required operating current. Its current-limiting principle is as follows: when transistor 301 is turned on, a complete circuit is formed from the positive terminal of power supply 1 through the LED, the current-limiting resistor 303, and the collector to emitter of transistor 301. Preferably, the resistance value of the current-limiting resistor is 100Ω.

[0036] As an optional implementation, it includes three water level monitoring branches 3, each with a different preset height, for monitoring different water level thresholds.

[0037] In practical applications, monitoring the water level in the test pool 5 often requires not only knowing whether the water level has reached its limit, but also understanding the dynamic changes in the water level so that operators can take appropriate measures according to different stages of water level rise. Therefore, this implementation method sets up three water level monitoring branches 3, each corresponding to a different preset height, to achieve graded monitoring of the water level.

[0038] Specifically, the bases of transistors 301 in the three water level monitoring branches 3 are connected to three different height positions on the wall of the test water tank 5. For ease of description, these three preset heights can be defined, from low to high, as the first water level threshold (200m), the second water level threshold (400m), and the third water level threshold (600m). The first water level threshold corresponds to a lower water level and can be used as a warning level; the second water level threshold corresponds to an intermediate water level and can be used as a warning level; and the third water level threshold corresponds to the highest water level and can be used as a danger level or an extreme alarm level.

[0039] Each water level monitoring branch 3 works in conjunction with the reference branch 4. One end of the reference branch 4 is connected to the bottom of the pool and is always in contact with the water, while the other end is connected to the positive terminal of the power supply 1, providing a common conductive loop for each water level monitoring branch 3. As the water level in the pool gradually rises, the water acts as a conductor, sequentially connecting the base of each water level monitoring branch 3 to the reference branch 4.

[0040] The specific working process is as follows: When the water level rises to the first water level threshold, the water body connects the base of the first water level monitoring branch 3 to the reference branch 4. The transistor 301 in this branch conducts, triggering the connected indicator 302 to issue an alarm signal, indicating to the operator that the water level has reached the warning height. When the water level continues to rise to the second water level threshold, the water body connects the base of the second water level monitoring branch 3 to the reference branch 4. The transistor 301 in this branch conducts, triggering the connected indicator 302 to issue an alarm signal, indicating to the operator that the water level has risen to the warning height. When the water level further rises to the third water level threshold, the water body connects the base of the third water level monitoring branch 3 to the reference branch 4. The transistor 301 in this branch conducts, triggering the connected indicator 302 to issue an alarm signal, indicating to the operator that the water level has reached the danger height and immediate measures are required.

[0041] By setting up three water level monitoring branches 3 at different heights, the device achieves graded monitoring and graded alarms for the water level in the test pool 5. Compared to a scheme that only sets a single alarm water level, graded monitoring provides operators with richer water level information, allowing them to clearly understand the process and speed of the water level rise. This enables them to prepare or take preventative measures in advance during the warning stage, avoiding being caught off guard when the water level suddenly reaches its limit. Simultaneously, the graded alarm mechanism helps distinguish alarm signals of different urgency levels. For example, lower water level thresholds can use only a light alarm, while the highest water level threshold can use both an audible and visual alarm to enhance the warning effect, thereby improving the rationality and effectiveness of the alarm.

[0042] Furthermore, the specific heights of the three water level thresholds can be flexibly set according to the actual depth of the test pool 5, the test process requirements, and safety regulations, exhibiting strong adaptability and adjustability. The three water level monitoring branches 3 in this embodiment are merely examples. In practical applications, two, four, or more water level monitoring branches 3 can be set up according to the required level of precision in monitoring, thereby expanding the number of water level monitoring gradients and achieving multi-level refined management of water levels.

[0043] As an optional implementation, the light-emitting diodes corresponding to different water level monitoring branches 3 have different light-emitting colors.

[0044] In this embodiment, different LEDs of different colors are configured for different water level monitoring branches 3, so that a one-to-one mapping relationship is formed between water level height and alarm color. The three water level monitoring branches 3 use three different colors of LEDs, for example, the first water level monitoring branch 3 corresponds to a green LED, the second water level monitoring branch 3 corresponds to a yellow LED, and the third water level monitoring branch 3 corresponds to a red LED.

[0045] When the water level rises to the first water level threshold, the green LED lights up. Operators can quickly determine that the water level has reached the warning height by observing the green light signal, at which point preliminary checks can be conducted or preparations for drainage can be made. When the water level continues to rise to the second water level threshold, the yellow LED lights up. Operators can determine that the water level has entered the warning zone based on the yellow light signal, and need to closely monitor water level changes and prepare for intervention measures. When the water level rises to the third water level threshold, the red LED lights up. Operators can determine that the water level has reached a dangerous height based on the red light signal, and need to immediately take emergency measures such as emergency drainage or stopping water intake. Furthermore, a buzzer is also installed in the water level monitoring branch corresponding to the third water level threshold. This buzzer is connected in parallel with the red LED. When the third water level threshold is reached, the red LED lights up, and the buzzer sounds an alarm, giving operators an emergency signal.

[0046] The different light colors not only allow for a direct distinction of water level thresholds—green typically represents a safe or normal state, yellow represents a warning or alert state, and red represents a dangerous or emergency state—this color coding aligns with human cognitive habits, enabling operators to instinctively understand the urgency of the current water level without additional thought when receiving an alarm signal, thereby shortening reaction time and improving emergency response efficiency.

[0047] As an optional implementation, switch 2 is a rocker switch connected in series with the negative output terminal of the power supply.

[0048] This embodiment uses a rocker switch and connects it in series with the negative output terminal of the power supply.

[0049] A rocker switch is a common type of mechanical switch, shaped like a boat or rocker plate. Operation involves pressing one side of the switch to tilt it up or down, thus connecting or disconnecting the contacts. These switches are characterized by their compact structure, clear tactile feedback, reliable operation, and long service life, and are widely used in various instruments and equipment. In applications such as water level monitoring and alarm devices for experimental water tanks, rocker switches allow operators to quickly control the power supply status of the device during carrying, moving, or use, enabling on / off switching without the need for tools.

[0050] As an optional implementation method, Figure 2This is a schematic diagram of the internal structure of the housing of the test water tank level monitoring and alarm device provided in an embodiment of the present invention, as shown below. Figure 2 As shown, it also includes a housing and a support plate 10; the power supply, switch, at least one water level monitoring branch and reference branch are set on the printed circuit board, and the printed circuit board is fixed to the support plate 10; the support plate is fixed to the inside of the housing by threaded parts 11.

[0051] All electronic components in the power supply, switches, at least one water level monitoring branch, and reference branch are mounted on the printed circuit board (PCB) via soldering or plug-in connections. The PCB serves as the physical carrier and electrical connection platform for circuit components, enabling a neat layout and reliable connection of components according to the circuit design diagram. This avoids the risks of poor contact and short circuits caused by flying wires, while also improving circuit consistency and manufacturability.

[0052] The printed circuit board (PCB) is secured to the support plate using threaded fasteners. The support plate is typically made of a material with sufficient strength and rigidity, such as a metal plate or rigid plastic sheet, and its shape and size are matched to the internal space of the enclosure. The support plate has pre-drilled threaded holes or through holes corresponding to the PCB mounting holes. The PCB is reliably fixed to the support plate surface using screws or other threaded fasteners, preventing the PCB from shaking or shifting during movement or use.

[0053] The support plate is then fixed to the inside of the enclosure using threaded fittings. The enclosure, as a protective structure, provides physical protection and environmental isolation for the internal circuitry. The support plate acts as an intermediate transition, avoiding stress concentration and disassembly difficulties that might occur if the printed circuit board were directly fixed to the bottom of the enclosure. Furthermore, the position of the support plate can be adjusted according to the structural characteristics of the enclosure's internal space. For example, by using threaded mounting posts of different heights, the support plate can be lowered a certain distance, leaving wiring space between it and the bottom of the enclosure for easy storage of external cables.

[0054] As an optional implementation method, Figure 3 This is a schematic diagram of the housing structure of the test water tank water level monitoring and alarm device provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the case is an aluminum alloy instrument case, with handles and buckles on the body.

[0055] In this embodiment, the enclosure can be made of aluminum alloy, which is lightweight, high-strength, corrosion-resistant, and impact-resistant, effectively protecting the internal circuitry from external impacts and environmental corrosion. The enclosure typically consists of a lid 6 and a lower enclosure 7, connected by a snap fastener 8 or hinge for easy opening and closing. A handle 9 can also be provided for carrying and transport. A support plate is fixed inside the lower enclosure, housing the printed circuit board and its components. When the lid is closed, the internal circuitry is in a sealed, protected state, effectively preventing dust and moisture. For maintenance or adjustment, the lid can be opened to directly access the printed circuit board, making maintenance convenient.

[0056] The above technical solution has the following beneficial effects: by using the water body's conductivity to automatically control the switching of the transistor, real-time monitoring and automatic alarm of the water level in the pool are realized, thereby replacing manual inspection and saving labor costs; by setting multiple monitoring electrodes at different heights, different water level thresholds can trigger corresponding indicator devices in stages, thereby intuitively reflecting the water level change process and facilitating timely and targeted measures; by integrating the circuit into a portable case, the device is easy to carry and deploy on site, thereby improving the flexibility of use.

[0057] The above-described specific embodiments of the invention further illustrate the purpose, technical solution, and beneficial effects of the invention. It should be understood that the above content is only for specific embodiments of the invention and is not intended to limit the scope of protection of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A water level monitoring and alarm device for a test water tank, characterized in that, include: Power supply, switch, at least one water level monitoring branch and a reference branch; Each water level monitoring branch includes a transistor and an indicator; the base of the transistor is connected to the wall of the test water tank at a preset height; the emitter of the transistor is connected to the negative terminal of the power supply; and the collector of the transistor is connected to the positive terminal of the power supply through the indicator. One end of the reference branch is connected to the bottom of the test water tank and is always in contact with water, while the other end is connected to the positive terminal of the power supply.

2. The test water tank water level monitoring and alarm device according to claim 1, characterized in that: Indicating devices include light-emitting diodes and / or buzzers; The anode of the light-emitting diode is connected to the positive terminal of the power supply, and the cathode is connected to the collector of the transistor. The positive terminal of the buzzer is connected to the positive terminal of the power supply, and the negative terminal is connected to the collector of the transistor.

3. The test water tank water level monitoring and alarm device according to claim 2, characterized in that: It also includes a current-limiting resistor, which is connected in series between the light-emitting diode and the collector of the transistor.

4. The test water tank water level monitoring and alarm device according to claim 1, characterized in that: It includes three water level monitoring branches, each with a different preset height, used to monitor different water level thresholds.

5. The test water tank water level monitoring and alarm device according to claim 2, characterized in that: The LEDs corresponding to different water level monitoring branches have different light emission colors.

6. The test water tank water level monitoring and alarm device according to claim 1, characterized in that: The switch is a rocker switch, connected in series with the negative output terminal of the power supply.

7. The test water tank water level monitoring and alarm device according to claim 1, characterized in that: It also includes the housing and support plates; The power supply, switch, at least one water level monitoring branch and reference branch are mounted on the printed circuit board, and the printed circuit board is fixed to the support plate; The support plate is fixed inside the box by threaded parts.

8. The test water tank water level monitoring and alarm device according to claim 1, characterized in that: The case is an aluminum alloy instrument case, and it is equipped with a handle and a buckle.

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