阅读说明：本技术 一种容器及液位异步检测装置 (Container and liquid level asynchronous detection device ) 是由 麦剑源 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种容器及液位异步检测装置,其包括外壳和电路板,所述电路板安装在外壳内,所述电路板包括用于侦测水箱的水箱侦测模块和用于侦测液位的液位侦测模块；所述水箱侦测模块与液位侦测模块连接,并为液位侦测模块提供工作电源；所述水箱侦测模块与外部的电源连接,所述液位侦测模块与输出端子连接；所述水箱侦测模块侦测到水箱后,再继续通电给液位侦测模块,由液位侦测模块进行液位侦测；所述水箱侦测模块和液位侦测模块均采用光学侦测方式。本发明采用2组光学原理电路实现检测,可以异步侦测水箱是否存在,液位是否是否在所设置的警戒线高度；具有功耗低、检测速度快、精度误差小、安装简单和成本低的优点。(The invention discloses a container and liquid level asynchronous detection device, which comprises a shell and a circuit board, wherein the circuit board is arranged in the shell and comprises a water tank detection module for detecting a water tank and a liquid level detection module for detecting the liquid level; the water tank detection module is connected with the liquid level detection module and provides a working power supply for the liquid level detection module; the water tank detection module is connected with an external power supply, and the liquid level detection module is connected with the output terminal; after the water tank detection module detects the water tank, the water tank detection module is continuously electrified to the liquid level detection module, and the liquid level detection module carries out liquid level detection; the water tank detection module and the liquid level detection module both adopt an optical detection mode. The invention adopts 2 groups of optical principle circuits to realize detection, and can asynchronously detect whether the water tank exists or not and whether the liquid level is at the height of the set warning line or not; the method has the advantages of low power consumption, high detection speed, small precision error, simple installation and low cost.)

1. The container and liquid level asynchronous detection device is characterized by comprising a shell and a circuit board, wherein the circuit board is arranged in the shell and comprises a water tank detection module for detecting a water tank and a liquid level detection module for detecting the liquid level; the water tank detection module is connected with the liquid level detection module and provides a working power supply for the liquid level detection module; the water tank detection module is connected with an external power supply, and the liquid level detection module is connected with the output terminal; after the water tank detection module detects the water tank, the water tank detection module is continuously electrified to the liquid level detection module, and the liquid level detection module carries out liquid level detection; the water tank detection module and the liquid level detection module both adopt an optical detection mode.

2. The container and liquid level asynchronous detection device according to claim 1, wherein the water tank detection module comprises an infrared light emitting tube IR1, a current limiting resistor RA for adjusting the emitting power of the infrared light emitting tube, an infrared light receiving tube IR3 for receiving infrared light signals reflected by prisms installed in the water tank, a pull-up current limiting resistor RC, a pull-down current limiting resistor RB, a transistor QA and a MOS tube QB for switching on and off current; the anode of the infrared light emitting tube IR1 is connected with the power input end, and the cathode of the infrared light emitting tube IR1 is connected with one end of the current limiting resistor RA; the other end of the current limiting resistor RA is grounded; the anode of the infrared photoelectric receiving tube IR3 is connected with the power input end through a pull-up current-limiting resistor RC, and the cathode of the infrared photoelectric receiving tube is grounded through a pull-down current-limiting resistor RB; the base electrode of the transistor QA is connected between the negative electrode of the infrared photoelectric receiving tube IR3 and the pull-down current-limiting resistor RB through a resistor RI; the anode of the infrared photoelectric receiving tube IR3 is connected between the resistor RI and the base of the transistor QA through the resistor RH; the collector of the transistor QA is connected with the anode of the resistor RE through the resistor RE and the resistor RD respectively, and the emitter of the transistor QA is grounded; MOS pipe QB 'S G utmost point is connected between resistance RD and resistance RE, and MOS pipe QB' S D utmost point is connected with resistance RD 'S positive pole, and MOS pipe QB' S the S utmost point is connected with the liquid level detection module.

3. The asynchronous detection device for container and liquid level as claimed in claim 2, wherein said liquid level detection module comprises an infrared light emitting tube IR2, an infrared light receiving tube IR4, a protection resistor RF and a resistor RG for combining the output final signal of the infrared light receiving tube IR 4; the infrared light emitting tube IR2 is connected with a protective resistor RF in series; the infrared photoelectric receiving tube IR4 and the resistor RG are connected in series; the anodes of the infrared light emitting tube IR2 and the infrared light receiving tube IR4 are connected with the S pole of the MOS tube QB; the cathodes of the protection resistor RF and the resistor RG are both grounded; the negative electrode of the infrared photoelectric receiving tube IR4 and the positive electrode of the resistor RG are connected to output terminals.

4. The asynchronous container and level detection device as recited in claim 2, wherein said resistor RC and said resistor RH, when used in combination, have a resistance RB equal to 0.

5. The asynchronous container and level detection device of claim 2, wherein the resistor RB and the resistor RI, when used in combination, have a RC equal to a resistance less than 10 ohms or less.

6. The asynchronous container and level detection device of claim 1, wherein the output terminals are three output pins.

7. The asynchronous detection device of container and liquid level of claim 1, characterized in that, the shell is provided with two fixed mounting ears, the mounting ears are provided with screw holes, and the detection device can be fixed on the water tank by matching the screws through the screw holes.

Technical Field

The invention relates to the field of liquid level detection, in particular to a container and a liquid level asynchronous detection device.

Background

The prior white household appliances such as a water dispenser, a coffee machine, a humidifier, an air conditioner fan and the like adopt a separated water tank design, most of the applications need to take the water tank down to contain water and then install the water tank, the traditional application only has more sensors for independently detecting the liquid level height of the water tank, such as a magnetic switch or a floating ball and reed switch module, or independent optical liquid level detection and capacitance type liquid level detection, the working principles of the sensors are basically the same and are realized by a mechanical device, magnetism and capacitance discharge mode, the realization mode is that the sensor of the current mode is in a working state with or without through the position change of the liquid height position, but because the detection modes have a defect, when the position of the water tank deviates from the sensor or the detection distance is far away, the probability of the sensing detection is in a failure state, resulting in equipment detection failure.

Therefore, improvements to the prior art are yet to be made.

Disclosure of Invention

The invention aims to provide a container and liquid level asynchronous detection device, aiming at solving the technical problem that a sensor of the detection device has detection faults when the narcissus position is deviated or the latter is detected to be far.

In order to achieve the purpose, the technical scheme of the invention is as follows: a container and liquid level asynchronous detection device comprises a shell and a circuit board, wherein the circuit board is arranged in the shell and comprises a water tank detection module for detecting a water tank and a liquid level detection module for detecting the liquid level; the water tank detection module is connected with the liquid level detection module and provides a working power supply for the liquid level detection module; the water tank detection module is connected with an external power supply, and the liquid level detection module is connected with the output terminal; after the water tank detection module detects the water tank, the water tank detection module is continuously electrified to the liquid level detection module, and the liquid level detection module carries out liquid level detection; the water tank detection module and the liquid level detection module both adopt an optical detection mode.

The container and liquid level asynchronous detection device is characterized in that the water tank detection module comprises an infrared light emitting tube IR1, a current limiting resistor RA for adjusting the emitting power of the infrared light emitting tube, an infrared photoelectric receiving tube IR3 for receiving infrared light signals reflected by prisms installed in a water tank, a pull-up current limiting resistor RC, a pull-down current limiting resistor RB, a transistor QA for switching on and off current and an MOS tube QB; the anode of the infrared light emitting tube IR1 is connected with the power input end, and the cathode of the infrared light emitting tube IR1 is connected with one end of the current limiting resistor RA; the other end of the current limiting resistor RA is grounded; the anode of the infrared photoelectric receiving tube IR3 is connected with the power input end through a pull-up current-limiting resistor RC, and the cathode of the infrared photoelectric receiving tube is grounded through a pull-down current-limiting resistor RB; the base electrode of the transistor QA is connected between the negative electrode of the infrared photoelectric receiving tube IR3 and the pull-down current-limiting resistor RB through a resistor RI; the anode of the infrared photoelectric receiving tube IR3 is connected between the resistor RI and the base of the transistor QA through the resistor RH; the collector of the transistor QA is connected with the anode of the resistor RE through the resistor RE and the resistor RD respectively, and the emitter of the transistor QA is grounded; MOS pipe QB 'S G utmost point is connected between resistance RD and resistance RE, and MOS pipe QB' S D utmost point is connected with resistance RD 'S positive pole, and MOS pipe QB' S the S utmost point is connected with the liquid level detection module.

The container and the liquid level asynchronous detection device are characterized in that the liquid level detection module comprises an infrared light transmitting tube IR2, an infrared light receiving tube IR4, a protection resistor RF and a resistor RG for combining the output final signals of the infrared light receiving tube IR 4; the infrared light emitting tube IR2 is connected with a protective resistor RF in series; the infrared photoelectric receiving tube IR4 and the resistor RG are connected in series; the anodes of the infrared light emitting tube IR2 and the infrared light receiving tube IR4 are connected with the S pole of the MOS tube QB; the cathodes of the protection resistor RF and the resistor RG are both grounded; the negative electrode of the infrared photoelectric receiving tube IR4 and the positive electrode of the resistor RG are connected to output terminals.

The container and the liquid level asynchronous detection device are characterized in that when the resistor RC and the resistor RH are used in combination, the resistor RB is equal to 0.

The container and the liquid level asynchronous detection device are characterized in that when the resistor RB and the resistor RI are used in a combined mode, RC is equal to or less than 10 ohms.

The container and the liquid level asynchronous detection device are characterized in that the output terminal is an output terminal with three output terminal pins.

The asynchronous detection device of container and liquid level, wherein, the shell is provided with two fixed mounting ears, and the installation ear is equipped with the screw hole, can fix detection device on the water tank through screw hole cooperation screw.

Has the advantages that: the invention adopts 2 groups of optical principle circuits to realize the detection of the water tank and the liquid level; the device can asynchronously detect whether the water tank exists or not, whether the liquid level meets the requirement of the alarm height or not, and can remind the accurate position of installing the water tank; the method has the advantages of low power consumption, high detection speed, small precision error, simple installation and low cost.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Fig. 3 is a schematic view of the installation of the present invention.

Fig. 4 is a first operation principle diagram of the present invention.

Fig. 5 is a second working principle diagram of the present invention.

Fig. 6 is a third working principle diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 1-3, the present invention discloses a container and liquid level asynchronous detection device 200, which comprises a housing 1 and a circuit board 2, wherein the circuit board 2 is installed in the housing 1, and the circuit board 2 comprises a water tank detection module 3 for detecting a water tank and a liquid level detection module 4 for detecting a liquid level; the water tank detection module 3 is connected with the liquid level detection module 4 and provides a working power supply for the liquid level detection module 4; the water tank detection module 3 is connected with an external power supply, and the liquid level detection module 4 is connected with the output terminal 5; after the water tank detection module 3 detects the water tank 100, the liquid level detection module 4 is powered on continuously, and the liquid level detection module 4 carries out liquid level detection; the water tank detection module 3 and the liquid level detection module 4 both adopt an optical detection mode.

Specifically, the water tank detection module 3 includes an infrared light emitting tube IR1, a current limiting resistor RA for adjusting the emitting power of the infrared light emitting tube, an infrared light receiving tube IR3 for receiving an infrared light signal reflected by a prism 101 installed in the water tank 100, a pull-up current limiting resistor RC, a pull-down current limiting resistor RB, a transistor QA for switching on and off the current, and a MOS tube QB; the anode of the infrared light emitting tube IR1 is connected with the power input end, and the cathode of the infrared light emitting tube IR1 is connected with one end of the current limiting resistor RA; the other end of the current limiting resistor RA is grounded; the anode of the infrared photoelectric receiving tube IR3 is connected with the power input end through a pull-up current-limiting resistor RC, and the cathode of the infrared photoelectric receiving tube is grounded through a pull-down current-limiting resistor RB; the base electrode of the transistor QA is connected between the negative electrode of the infrared photoelectric receiving tube IR3 and the pull-down current-limiting resistor RB through a resistor RI; the anode of the infrared photoelectric receiving tube IR3 is connected between the resistor RI and the base of the transistor QA through the resistor RH; the collector of the transistor QA is connected with the anode of the resistor RE through the resistor RE and the resistor RD respectively, and the emitter of the transistor QA is grounded; MOS pipe QB 'S G utmost point is connected between resistance RD and resistance RE, and MOS pipe QB' S D utmost point is connected with resistance RD 'S positive pole, and MOS pipe QB' S the S utmost point is connected with the liquid level detection module.

The pull-up current-limiting resistor RC and the pull-down current-limiting resistor RB are pull-up or pull-down current-limiting resistors for adjusting the saturation voltage of the infrared photoelectric receiving tube IR3 in the working state.

Specifically, the liquid level detection module 4 includes an infrared light transmitting tube IR2, an infrared light receiving tube IR4, a protection resistor RF, and a resistor RG for combining the output final signal of the infrared light receiving tube IR 4; the infrared light emitting tube IR2 is connected with a protective resistor RF in series; the infrared photoelectric receiving tube IR4 and the resistor RG are connected in series; the anodes of the infrared light emitting tube IR2 and the infrared light receiving tube IR4 are connected with the S pole of the MOS tube QB; the cathodes of the protection resistor RF and the resistor RG are both grounded; the negative electrode of the infrared photoelectric receiving tube IR4 and the positive electrode of the resistor RG are connected with an output terminal; when the liquid level is lower than the detection point, the PIN2 of the output terminal 5 (i.e., J1) outputs a low level.

Preferably, the distance L between the detection points of the liquid level detection module 4 and the tank detection module 3 is 5 mm.

Preferably, the resistance RB is equal to 0 when the resistance RC is used in combination with the resistance RH; in this case, the resistor RI does not require an upper piece.

Preferably, when the resistor RB and the resistor RI are used in combination, RC is equal to or less than 10 ohms; in this case, the resistor RH does not require an upper part.

Specifically, the output terminal 5 is an output terminal of three output pins.

Preferably, the external power source is 5V ac.

And the resistor RD and the resistor RE are pull-up and pull-down resistors for switching on and off the MOS tube QB.

Preferably, the MOS transistor QB can be replaced by an NMOS or Pmos, and the transistor QA can be replaced by an NPN or a PNP according to different combinations.

Preferably, the housing 1 is provided with two fixing lugs 10, which are provided with screw holes 11, through which screws can be engaged to fix the detecting device on the water tank 100.

As shown in fig. 4-6, the working principle of the present invention has the following processes:

1. process for placing water tank with water

When a user places the water tank 100 filled with books on the sensor side, infrared light emitted by the infrared light emitting tube IR1 is refracted (reflected) by the water tank 100 and transmitted to the infrared light receiving tube IR3, the infrared light receiving tube IR3 is turned on after receiving the infrared light, the point potential of the pull-up current limiting resistor RC and the resistor RH is converted from high level to low level to cause the transistor QA to be turned on, the middle potential (S pole of QB) of the resistor RD/resistor RE changes at the moment, the level changes from high level to low level to cause the MOS tube QB to be turned on, the power supply supplies power to the liquid level detection module after the conduction, light emitted by the infrared light emitting tube IR2 is directly emitted through the water 300, because the infrared photoelectric receiving tube IR4 is not conducted when not receiving infrared light, it is in high resistance state, the intermediate potential between the infrared photoelectric receiving tube IR4 and the resistor RG becomes low through voltage division, and it outputs low level (output value >0 potential) corresponding to J1 PIN 2;

2. water shortage process of water tank

When the liquid level becomes lower than a detection point, infrared light emitted by the infrared light emitting tube IR2 is reflected to the upper surface of the infrared photoelectric receiving tube IR4 through the water tank to form conduction of the infrared photoelectric receiving tube IR4, and the voltage above the resistor RG is approximate to VCC power supply voltage due to the conduction of the infrared light receiving tube IR4, and at the moment, J1 PIN3 outputs high potential;

3. water tank removal process

When the water tank is removed, infrared light emitted by the infrared light emitting tube IR1 cannot be reflected, the infrared photoelectric receiving tube IR3 is in a high-impedance state due to the fact that the infrared light cannot be received, power supply of a rear-end power circuit is cut off (a MOS tube QB is not conducted), power cannot be supplied due to the infrared photoelectric receiving tube IR4, and J1 PIN2 outputs a low level (equal to 0 potential).

The invention adopts 2 groups of optical principle circuits to realize the detection of the water tank and the liquid level; the device can asynchronously detect whether the water tank exists or not, whether the liquid level meets the requirement of the alarm height or not, and can remind the accurate position of installing the water tank; the method has the advantages of low power consumption, high detection speed, small precision error, simple installation and low cost; the detection device is integrated for detection, is simple to install and is used for detection in an air-isolated mode; the detection speed of the invention is less than 20ms, and the detection liquid level precision error is less than 1 mm.

The above is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, modifications or equivalent substitutions of the technical solution of the present invention without inventive work may be made without departing from the scope of the present invention.