CN114609689A - Flow detection device for liquid pipeline of household appliance - Google Patents
Flow detection device for liquid pipeline of household appliance Download PDFInfo
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- CN114609689A CN114609689A CN202210218322.8A CN202210218322A CN114609689A CN 114609689 A CN114609689 A CN 114609689A CN 202210218322 A CN202210218322 A CN 202210218322A CN 114609689 A CN114609689 A CN 114609689A
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- upper cover
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
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Abstract
The invention discloses a flow detection device for a liquid pipeline of a household appliance, which comprises a shell and an infrared detection circuit board for detecting the flow of liquid, wherein the shell comprises an upper cover, a sealing ring and a lower cover; the infrared detection circuit board is inserted into the isosceles right triangle light-transmitting structure; the upper cover is provided with a flow guide channel, and the flow guide channel is used for communicating a water gap of the upper cover with a water gap of the lower cover; the sealing ring is arranged between the upper cover and the lower cover, and the upper cover and the lower cover are fixedly connected in a buckling mode. According to the invention, the isosceles right triangle light-transmitting structure is arranged in the upper cover, and the infrared detection circuit board is inserted into the isosceles right triangle light-transmitting structure, so that liquid in the diversion channel can be detected when passing through, and the upper cover and the lower cover are locked and connected through the seal ring buckle, so that the whole structure is simple, the operation is convenient, and the size is small.
Description
Technical Field
The invention relates to the technical field of liquid flow detection, in particular to a liquid pipeline flow detection device for a household appliance.
Background
At present, with the continuous updating and expansion of white household appliance market products, the volume of the products is smaller and smaller, especially, the products contain liquid, and the state that whether the built-in liquid exists or not needs to be detected is gradually obvious, for example, products such as a humidifier sweeper, an ironing machine water dispenser, a coffee machine, an air conditioner fan and the like need to detect whether the liquid level exists in a water tank or a water pipe or not in time so as to remind users of liquid supplement. However, the existing liquid pipeline flow detection device has the problems of small volume and simple structure.
Therefore, improvements and developments in the prior art are yet to be made.
Disclosure of Invention
The invention aims to provide a household appliance liquid pipeline flow detection device, and aims to solve the technical problems that the conventional household appliance liquid pipeline flow detection device is not small enough, is not simple enough in structure and is not simple enough in operation.
In order to achieve the purpose, the technical scheme of the invention is as follows: a household appliance liquid pipeline flow detection device comprises a shell and an infrared detection circuit board for detecting liquid flow, wherein the shell comprises an upper cover, a sealing ring and a lower cover, the upper cover and the lower cover are respectively provided with a water gap for liquid to pass through, and an isosceles right triangle light transmission structure vertical to the water gap is also arranged in the upper cover; the infrared detection circuit board is inserted into the isosceles right triangle light-transmitting structure; the upper cover is provided with a flow guide channel which is used for communicating a water gap of the upper cover with a water gap of the lower cover; the sealing ring is arranged between the upper cover and the lower cover, and the upper cover and the lower cover are fixedly connected in a buckling mode.
The household appliance liquid pipeline flow detection device is characterized in that the infrared detection circuit board comprises an infrared photoelectric detection circuit and a digital-to-analog conversion circuit, the infrared photoelectric detection circuit is connected with the digital-to-analog conversion circuit, a photoelectric signal detected by the infrared photoelectric detection circuit is converted into an analog voltage, and then the analog voltage is converted into a level signal by the digital-to-analog conversion circuit.
The household appliance liquid pipeline flow detection device comprises an infrared emission diode IR1 for emitting infrared light, an infrared receiving tube IR3 for receiving infrared light, a current limiting resistor RA and a voltage dividing resistor RC, wherein the current limiting resistor RA is connected with the infrared emission diode IR1 in series, the voltage dividing resistor RC is connected with the infrared receiving tube IR3 in series, and the infrared emission diode IR1 and the current limiting resistor RA which are connected in series are connected with the voltage dividing resistor RC and the infrared receiving tube IR3 which are connected in series in parallel.
The household appliance liquid pipeline flow detection device is characterized in that the digital-to-analog conversion circuit is composed of a resistor RD and a triode QA, the resistor RD is connected with a pin 3 of the triode QA, a pin 2 of the triode QA is grounded, a pin 1 of the triode QA is connected between a voltage dividing resistor RC and an infrared receiving tube IR3, and the pin 3 and the pin 2 of the triode QA are further connected with a connector J1 for output.
The household appliance liquid pipeline flow detection device is characterized in that the infrared detection circuit board is a PCB circuit board, a hole is formed in the PCB circuit board, and the infrared emitting diode IR1 is embedded in the hole.
Domestic appliance liquid pipeline flow detection device, wherein, the upper cover is equipped with the fixture block that is used for the screens all around, the fixture block has 4.
The household appliance liquid pipeline flow detection device is characterized in that the inner wall of the lower cover is provided with 4 clamping grooves locked by corresponding clamping blocks.
The household appliance liquid pipeline flow detection device is characterized in that the isosceles right triangle light-transmitting structure is provided with a jack for mounting an infrared detection circuit board.
The household appliance liquid pipeline flow detection device is characterized in that the clamping groove is provided with a clamping block inlet into which the corresponding clamping block is inserted.
The household appliance liquid pipeline flow detection device is characterized in that the fixture block is provided with a trapezoidal guide part.
Has the advantages that: according to the invention, the upper cover and the lower cover are respectively provided with the water gap, the upper cover is also provided with the flow guide channel communicated with the water gap, the upper cover is also internally provided with the isosceles right triangle light transmission structure, and the infrared detection circuit board is inserted into the isosceles right triangle light transmission structure, so that liquid in the flow guide channel can be detected when the liquid passes through the flow guide channel, and the upper cover and the lower cover are locked and connected through the sealing ring buckle, so that the whole structure is simple, the operation is convenient, and the size is small.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a top view of the present invention.
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention.
Fig. 4 is a side view of the present invention.
Fig. 5 is a cross-sectional view of fig. 4C-C of the present invention.
Fig. 6 is an exploded view of the present invention.
Fig. 7 is an exploded view in another aspect of the invention.
Fig. 8 is a perspective view of the upper cover of the present invention in a first orientation.
Fig. 9 is a perspective view of the upper cover of the present invention in a second orientation.
Fig. 10 is a circuit diagram of an infrared detection circuit board of the present invention.
Fig. 11 is a front view of a PCB circuit board of the present invention.
Fig. 12 is a rear view of a PCB circuit board 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. 1-12, the present invention discloses a flow detection device for a liquid pipeline of a household electrical appliance, which comprises a housing 1 and an infrared detection circuit board 2 for detecting liquid flow, wherein the housing 1 comprises an upper cover 3, a sealing ring 4 and a lower cover 5, the upper cover 3 and the lower cover 5 are respectively provided with a water gap 6 for liquid to pass through, and the inside of the upper cover 3 is further provided with an isosceles right triangle light transmission structure 7 perpendicular to the water gap; the infrared detection circuit board 2 is inserted into the isosceles right triangle light-transmitting structure 7; the upper cover 3 is provided with a flow guide channel 30, and the flow guide channel 30 is used for communicating the water gap 6 of the upper cover with the water gap 6 of the lower cover; the sealing ring 4 is arranged between the upper cover 3 and the lower cover 5, and the upper cover 3 and the lower cover 5 are fixedly connected in a buckling mode.
After the structure is adopted, the integral structure of the invention is simple, the isosceles right triangle light-transmitting structure vertical to the water gap is arranged in the upper cover, and the infrared detection circuit board is inserted in the isosceles right triangle light-transmitting structure, so that when liquid flows in the flow guide channel, the liquid can be detected by the infrared detection circuit board, and the operation is simple. Because the upper cover and the lower cover are fixedly connected through the bayonet, the assembly is convenient, and the size is smaller.
The sealing ring 4 is used for sealing the gap between the upper cover and the lower cover, and can seal liquid in the cavity, so that air leakage caused by untight sealing of the upper cover and the lower cover is avoided, and no detection signal output is influenced. The lower cover is a container for storing water flow liquid, and when the liquid passes through, a cavity of the lower cover is bound to contain a certain amount of liquid.
The shell of the invention can be adjusted and installed in 4 directions vertical to 90 degrees, and is used for infrared emission and infrared reception of infrared detection to detect whether water flow exists or not, and the connector is installed on the water flow module; because the detection device of the invention is not in direct contact with liquid, the invention can adapt to the detection requirements of various special-shaped liquid flow paths and even water flows containing pollutants. When the liquid detector is used, the liquid detector can be directly connected in series to a liquid pipeline to be detected and then directly output through a connecting wire.
Specifically, the infrared detection circuit board 2 includes an infrared photoelectric detection circuit 20 and a digital-to-analog conversion circuit 21, the infrared photoelectric detection circuit 20 is connected to the digital-to-analog conversion circuit 21, and a photoelectric signal detected by the infrared photoelectric detection circuit 20 is converted into an analog voltage and then converted into a level signal by the digital-to-analog conversion circuit 21.
The cavity of the flow guide channel can contain liquid to directly flow through, and the liquid passes through the detection route of the infrared detection circuit board in the flowing process, so that in the flowing process of the liquid, the infrared photoelectric detection circuit can be triggered to output corresponding analog voltage, the output analog voltage is converted through the digital-to-analog conversion circuit at the rear end, high and low level signals are output, the output level signals are output to the decoding circuit of the rear end system through the connector on the module, and whether the liquid flows is effectively detected. The invention has the advantages of simple structure, convenient operation, low power consumption of the detection device, wide power supply range, low power consumption and sensitive detection speed.
Specifically, the infrared photodetection circuit 20 includes an infrared emitting diode IR1 for emitting infrared light, an infrared receiving tube IR3 for receiving infrared light, a current limiting resistor RA and a voltage dividing resistor RC, wherein the current resistor RA is connected in series with the infrared emitting diode IR1, the voltage dividing resistor RC is connected in series with the infrared receiving tube IR3, and the series connected infrared emitting diode IR1 and current limiting resistor RA are connected in parallel with the series connected voltage dividing resistor RC and infrared receiving tube IR 3.
Preferably, the isosceles right-angled triangle light-transmitting structure 7 is a triangular prism structure; the isosceles right triangle light-transmitting structure 7 is provided with a jack 70.
The infrared emitting diode IR1 and the infrared receiving tube IR3 are used for detecting whether liquid flows through the triangular prism structure, when the liquid does not flow through or the liquid container does not contain the liquid, an infrared signal emitted by the infrared emitting diode IR1 is reflected by the triangular prism structure, the reflected infrared light directly reaches the infrared receiving tube IR3 to form the infrared receiving tube IR3 conduction, the current limiting resistor RA is the current limiting resistor of the infrared emitting diode IR1, when the resistance value of the current limiting resistor RA is increased, the circuit can support higher input voltage, otherwise, the input voltage is reduced, the voltage dividing resistor RC is the voltage dividing resistor of the infrared receiving tube IR3, the resistance value of the voltage dividing resistor RC is adjusted, and therefore when different voltages are input, the divided voltage after the infrared receiving tube IR3 is conducted can drive the rear-end conversion circuit to start.
Because the front module is irradiated by light path reflection, the obtained voltage can not be directly output to the decoding system circuit at the rear end, so that it is necessary to make an analog-to-digital conversion circuit.
Specifically, the digital-to-analog conversion circuit 21 is composed of a resistor RD and a triode QA, the resistor RD is connected with a pin 3 of the triode QA, a pin 2 of the triode QA is grounded, a pin 1 of the triode QA is connected between a voltage dividing resistor RC and an infrared receiving tube IR3, and the pin 3 and the pin 2 of the triode QA are further connected with a connector J1 for output. When triode QA is not aroused to switch on, triode QA presents the high impedance state, and the partial pressure point between resistance RD and triode QA can be ignored, when triode QA switches on, presents the low resistance, and resistance RD is approximate direct connection ground connection this moment, therefore, when triode QA switches on, the voltage of output equals GND, when triode QA does not switch on, the voltage of output is close VCC (RD equals pull-up resistance).
As is well known, the infrared emission of the infrared light emitting diode has a certain angle, and when the infrared receiving tube approaches, a certain amount of diffuse reflection infrared light passes through the infrared light emitting diode, so that the receiving tube is in a micro-conduction state.
Preferably, the infrared detection circuit board 2 is a PCB circuit board 200, a hole 201 is dug on the PCB circuit board 200, and the infrared emitting diode IR1 is embedded in the hole 201. Adopt this design direct dig the hole on the PCB base plate, then in embedding the PCB to infrared geminate transistor, can directly save and use sleeve pipe or solitary lens hood, the design on the market is used for the wire to connect now more simultaneously to there is different line length, can often adjust the problem of length or packing compounding on the supply of material, be difficult to produce. According to the invention, the PIN needle of the connector is directly attached to the circuit board, and then the connector is formed through the shell structure, so that the material number screening is not carried out due to the length of the wire when a customer selects the connector, the production is easy, due to the modular design, the automatic production and the advance stock can be carried out, the production process is relatively simple, and the material and production cost are lower when the design is adopted under the same design scheme.
Preferably, the periphery of the upper cover 3 is provided with 4 clamping blocks 31 for clamping; the clamping block is used for locking the lower cover during installation, so that the upper cover and the lower cover can be assembled conveniently.
Preferably, the inner wall of the lower cover 5 is provided with 4 clamping grooves 50 corresponding to the locking blocks for locking.
Preferably, the locking groove 50 is provided with a locking block inlet 500 into which the locking block is inserted, so that the locking block can enter the locking groove, and then the upper cover is rotated, so that the locking block is locked into the locking groove.
Preferably, the latch 31 is provided with a trapezoidal guide portion 310, so that the latch can be screwed into the latch slot more quickly and locked by the latch slot.
The working principle flow is as follows:
the upper cover is assumed to be a liquid inlet, and the lower cover is assumed to be a water outlet; when liquid flow enters under certain pressure, the liquid flows downwards along the triangular prism structure and then flows out through the water outlet after being filled in the cavity, at the moment, because of the entering of the liquid, an infrared signal transmitted by the infrared transmitting tube directly passes through a liquid medium and cannot form reflection, at the moment, the infrared transmitting signal cannot be received by the infrared receiving tube, the receiving tube is in a high-resistance state, otherwise, when the liquid does not flow, the liquid in the cavity can be pumped away by the water outlet device, so that the cavity is free from the liquid, the infrared signal transmitted by the infrared transmitting tube is reflected onto the receiving tube for 2 times to form the conduction of the receiving tube,
the voltages obtained in the two situations are obviously different, and enough driving can be obtained through resistance value adjustment of the resistor, so that the digital circuit at the rear end is switched on or switched off, and whether liquid flows through the liquid flow-through state or not is obviously distinguished according to the change of the voltage.
The invention has simple assembly, and the design materials are all universal models of the product and are not changed by different customers.
The water mentioned in the present invention may be any liquid such as milk, purified water, sewage, alcohol, gasoline, etc.
According to the invention, the upper cover and the lower cover are respectively provided with the water gap, the upper cover is also provided with the flow guide channel communicated with the water gap, the upper cover is also internally provided with the isosceles right triangle light transmission structure, and the infrared detection circuit board is inserted into the isosceles right triangle light transmission structure, so that liquid in the flow guide channel can be detected when the liquid passes through the flow guide channel, and the upper cover and the lower cover are locked and connected through the sealing ring buckle, so that the whole structure is simple, the operation is convenient, and the size is small.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The device for detecting the liquid pipeline flow of the household appliance is characterized by comprising a shell and an infrared detection circuit board for detecting the liquid flow, wherein the shell comprises an upper cover, a sealing ring and a lower cover; the infrared detection circuit board is inserted into the isosceles right triangle light-transmitting structure; the upper cover is provided with a flow guide channel, and the flow guide channel is used for communicating a water gap of the upper cover with a water gap of the lower cover; the sealing ring is arranged between the upper cover and the lower cover, and the upper cover and the lower cover are fixedly connected in a buckling mode.
2. The device for detecting the liquid pipeline flow of the household appliance according to claim 1, wherein the infrared detection circuit board comprises an infrared photoelectric detection circuit and a digital-to-analog conversion circuit, the infrared photoelectric detection circuit is connected with the digital-to-analog conversion circuit, and a photoelectric signal detected by the infrared photoelectric detection circuit is converted into an analog voltage and then is converted into a level signal by the digital-to-analog conversion circuit.
3. The device for detecting the liquid pipeline flow of the household appliance according to claim 2, wherein the infrared photoelectric detection circuit comprises an infrared emitting diode IR1 for emitting infrared light, an infrared receiving tube IR3 for receiving infrared light, a current limiting resistor RA and a voltage dividing resistor RC, the current limiting resistor RA is connected in series with the infrared emitting diode IR1, the voltage dividing resistor RC is connected in series with the infrared receiving tube IR3, and the series connected infrared emitting diode IR1 and the current limiting resistor RA are connected in parallel with the series connected voltage dividing resistor RC and the series connected infrared receiving tube IR 3.
4. The device for detecting the liquid pipeline flow of a household appliance according to claim 3, wherein the digital-to-analog conversion circuit comprises a resistor RD and a transistor QA, the resistor RD is connected to the 3 pins of the transistor QA, the 2 pins of the transistor QA are grounded, the 1 pin of the transistor QA is connected between the voltage dividing resistor RC and the infrared receiving tube IR3, and the 3 pins and the 2 pins of the transistor QA are further connected to a connector J1 for output.
5. The device for detecting the liquid pipeline flow of a household electrical appliance according to claim 4, wherein the infrared detection circuit board is a PCB circuit board, a hole is dug on the PCB circuit board, and the infrared emitting diode IR1 is embedded in the hole.
6. The device for detecting the flow of a liquid pipeline in a household appliance according to claim 1, wherein 4 blocks for locking are arranged around the upper cover.
7. The device for detecting the flow of a liquid pipeline in a household appliance according to claim 6, wherein 4 slots corresponding to the locking blocks are formed in the inner wall of the lower cover.
8. The device for detecting the flow of a liquid pipeline in a household appliance according to claim 1, wherein the isosceles right triangle light-transmitting structure is provided with a jack for mounting an infrared detection circuit board.
9. The device for detecting the flow of a liquid pipeline in a household appliance according to claim 7, wherein the engaging groove is provided with an engaging block inlet corresponding to the engaging block.
10. The device for detecting the flow of a liquid pipeline in a household appliance according to claim 9, wherein the block is provided with a trapezoidal guide portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218322.8A CN114609689A (en) | 2022-03-08 | 2022-03-08 | Flow detection device for liquid pipeline of household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218322.8A CN114609689A (en) | 2022-03-08 | 2022-03-08 | Flow detection device for liquid pipeline of household appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114609689A true CN114609689A (en) | 2022-06-10 |
Family
ID=81860572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210218322.8A Pending CN114609689A (en) | 2022-03-08 | 2022-03-08 | Flow detection device for liquid pipeline of household appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114609689A (en) |
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2022
- 2022-03-08 CN CN202210218322.8A patent/CN114609689A/en active Pending
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