CN2035513U

CN2035513U - Electronic warner for urine in diaper

Info

Publication number: CN2035513U
Application number: CN 88207514
Authority: CN
Inventors: 黄萌
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-06-27
Filing date: 1988-06-27
Publication date: 1989-04-05

Abstract

The utility model relates to an electronic warner for urine in diaper, belonging to a moisture sensitive alarm and comprising a sounding element, an electric voltage ceramic, a sense element probe and a transistor amplifier. The scheme has two implemented examples that the interrupted noise (toot, toot.) and the continuous noise (toot.) are sent out and can send out signals to the urine and the feces for the babies and the people who suffer from serious disease and can not take self-care and can also send out accurate signals to the humidity of the other environment.

Description

Electronic warner for urine in diaper

The utility model belongs to the warning device to moisture-sensitive.

The people's that baby, half body can not be taken care of oneself with, inferior paraplegia or other grave illness just urine all need be handled by the paramedic, does not accommodate pain if so can cause other illness for a long time if untimely processing then causes.Problem is discovery that will be promptly and accurately or obtains signal.Also some needs moist environment in addition, dry goes wrong on the contrary, also needs to obtain signal accurately, is convenient to control and in time handles.

The purpose of this utility model is the warning device to moisture-sensitive that provides a kind of simple in structure, reliable in function for solving the problems of the technologies described above, and intends adopting piezo ceramic element to send voice signal clearly.

By design as above, the feature of electronics urine warner provided by the utility model is: it is made up of piezoelectric ceramics JT, transistor amplifier circuit, probe, power supply and resonant cavity.Its operating circuit is formed positive feedback formula audio frequency oscillator by transistor BG, piezoelectric ceramics JT and Ra, Rb, Rc, and is made up of the audio frequency interrupted ciruit that Rd, D, C form.Its probe is two electrodes of the finger-fork type mutually insulated made by copper clad plate, this probe string is in transistorized base loop, transistor amplifier is made up of BG, Ra, Rb, Rc, the feedback line of its collector is connected on the feedback end of piezoelectric ceramics JT, the amplifier out of JT connects transistorized base loop, the earth terminal ground connection of JT.Its audio frequency interrupted ciruit is to connect its end ground connection, another termination base loop with capacitor C again by resistance R d and diode D parallel connection.Its resonant cavity is to seal the flat cavity that has some sound holes on opening, the following face with piezoelectric ceramics JT above one, and this cavity is done on the plate face of housing.

The two poles of the earth string of the probe of the fourchette shape mutually insulated in this programme is in base loop, signal can not pass through at ordinary times, when the long and narrow slit of probe has contacted conducting liquid or non-pure water, probe only is equivalent to several kilohms resistance or also littler, and signal can be sent into transistor amplifier by probe like this.This circuit is in the moment of energising (being the less path of resistance if look probe), because the piezoelectric effect of JT and the effect of back wash effect thereof, on the base stage of BG, produce a pulse, be exaggerated the back and send JT again back to from collector, not only on the base stage at BG under the effect of piezoelectric effect and back wash effect but also produce the pulse that an amplitude is not less than first pulse, so follow the audio oscillation of back and forth promptly setting up positive feedback.Owing to occur piezoelectricity and inverse piezoelectric effect repeatedly on JT, the audio frequency sound is then sent in substrate deformation, also has an audio frequency interrupted ciruit and piezoelectric ceramics JT to be in parallel on base loop.When circuit was connected, because the voltage on the C can not suddenly change, BG was operated in the state that ends, and power supply charges to C by Ra, Rd, after the forward voltage of voltage greater than BG at C two ends, and the BG conducting, oscillator starting oscillation sounding, at this moment C keeps vibration by the D discharge.When the voltage on the C dropped to the condition that is lower than the BG conducting, BG ended, the blocking of oscillator, and power supply begins the charging to C by Ra, Rd again, has so just produced interrupted sound repeatedly.The prerequisite that entire circuit is kept the oscillatory work state is that probe is path, therefore whether can send sound, and the moist degree of probe environment of living in just is being described.

The advantage that adopts this programme to embody: the structure of (1) this electronics urine warner is very simple, widely applicable, can solve the baby, the patient that can not take care of oneself just urinates and accurately quotes signal, if in time handle then reduce do not accommodate pain if, if can not in time handle, then send sound always and change ambient condition until probe.If probe is made elongated state, insert in the flowerpot, can accurately monitor the humidity of soil; (2) cost simple in structure is very low, is easy to make promote; (3) power-saving, because power is less, a pair of No.5 cell can be worked more than half a year.

Description of drawings:

Fig. 1 is the schematic appearance of electronics urine warner.Wherein: (1)-probe; (2)-lead-in wire; (8)-shell.

Fig. 2 be the electronics urine warner send the interrupted sound (pout, pout, pout ...) circuit theory diagrams.Wherein: the JT-piezoelectric ceramics; Ra, Rb, Rc, Rd-resistance; The D-diode; C-electric capacity; The BG-triode.The numerical value of its Ra determines in debugging.

Fig. 4 is the structural representation of probe.

Fig. 5 is the structural representation of resonant cavity.Wherein: (4)-piezoelectric ceramics JT; (5)-resonant cavity.

Embodiment:

The embodiment of this programme (as shown in Figure 2): BG adopts 3DG201, Ra=254K, and Rb=1.6K, Rc=3K, Rd=27K, C=10 μ F, D=2AP9, JT is a piezoelectric ceramics, pops one's head in to be copper clad plate 40 * 20mm, the slit width of two interpolars is 2mm.When probe touches the water conducting, send intermittently pout, pout, sound, the about dB of the sound.

The shell sizes of embodiment is 82 * 32 * 13mm.

Claims

1, a kind of electronics urine warner that can send the interrupted sound is characterized in that what it was made up of piezoelectric ceramics JT, transistor amplifier circuit, probe, power supply and resonant cavity; Its operating circuit by BG, Ra, Rb, Rc, JT form transistor positive feedback formula audio frequency oscillator, and the audio frequency interrupted ciruit of forming by Rd, D, C formed, its probe is two electrodes being made the finger-fork type mutually insulated by copper clad plate, this probe string is in transistorized base loop, transistor amplifier is made up of BG, Ra, Rb, Rc, the feedback line of its collector is connected on the feedback end of piezoelectric ceramics JT, the amplifier out of JT connects probe and goes into base loop, the earth terminal ground connection of JT; Its audio frequency interrupted ciruit is to connect an end ground connection, another termination base loop with C again by Rd and D parallel connection; Its resonant cavity is to seal the flat cavity that has some sound holes on opening, the following face with piezoelectric ceramics JT above one.