CN2212774Y

CN2212774Y - Vibration testing type water boiling tester

Info

Publication number: CN2212774Y
Application number: CN 94244165
Authority: CN
Inventors: 何荣燊
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-01
Filing date: 1994-11-01
Publication date: 1995-11-15
Anticipated expiration: 2004-11-01

Abstract

The utility model relates to a vibration testing type water boiling tester. When the water-boiling device and the water loading device boils the water, the vibration caused by the water boiling is transferred to a vibration sensing element through an elastic metal sheet, and is converted into an electric signal by the vibration sensing element. The electric signal is amplified, confirmed, processed and changed into an audio signal through a circuit, and a loudspeaker sends out the alarm signal. The utility model has firm and reliable structure, really reflects whether the water is boiled or not, and is widely suitable for various places.

Description

Vibration testing type water boiling tester

The utility model relates to a kind of water boiling pick-up unit, especially a kind of vibration testing type boiling pick-up unit.

In now widely used automatic boiler, the boiler, be to detect water with bimetallic strip, thermopair, magnetic temp-controlling element whether to seethe with excitement mostly, when water temperature reaches predefined temperature and is generally 100 ℃, then send alerting signal; But the boiling point of water changes with water quality, atmospheric pressure, will occur the control error like this, can not reflect truly whether water is boiled; Utilize the direct observing and controlling water temperature of temp-controlling element on the other hand, not only temperature element meeting corrosion, water container are wanted waterproof sealing, influence serviceable life, reliability, and water quality is polluted, and be unfavorable to health.

The purpose of this utility model be to provide a kind of be contained in water container outer utilize the water boiling time cause that water container vibrates and detect the whether boiled vibration testing type water boiling pick-up unit of water.

The utility model is to realize above-mentioned purpose like this: cause the vibration of water container when utilizing water to open boiling, a sensor is installed outside water container, the vibration of water container passes to vibration sensitive element by the briquetting in the sensor, elastic sheet metal, vibration sensitive element converts vibration to electric signal, this electric signal is confirmed, is amplified through circuit, send alerting signal, inform that water is boiled.

Because the utility model is to utilize water boiling the time the causing vibration of water container to open signal as water, so whether the utility model can reflect water truly boiled, and the utility model is to be contained in outside the water container, can not bring problems such as corrosion, sealing, improves the reliability of boiler.

Engage accompanying drawing below the utility model is done concrete detailed description the in detail.

Fig. 1 is the concrete structure figure of sensor of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

With reference to Fig. 1, the 1st, sender unit cap, the 2nd, sensor holder has a counterbore 6 in the sensor holder 2, vibration sensitive element 4 is equipped with in the bottom of counterbore 6, elastic sheet metal 3 is housed on the vibration sensitive element 4, briquetting 5 is arranged on the sheet metal 3, the top of briquetting 5 is passed and is protruded sender unit cap 1, so that contact water container, the vibration of water container through elastic sheet metal 3, is passed to vibration sensitive element 4, and vibration sensitive element 4 converts vibration to electric signal.

With reference to Fig. 2, M is vibration sensitive element (being 4 among Fig. 1), and it becomes vibration into electric signal, resistance R ₁₁With capacitor C ₁₁After the parallel connection, a termination operational amplifier A ₁Reverse input end, another termination operational amplifier A ₁Output terminal, form an electric charge-electric pressure converter; Capacitor C ₂₁A termination operational amplifier A ₂Output terminal, the other end is connected on resistance R ₂₁With R ₂₂Between, form second-order low-pass filter, second-order low-pass filter can only allow the electric signal that frequency is less than or equal to the vibration frequency of water container pass through; Resistance R ₃₂One termination operational amplifier A ₃Reverse input end, another termination operational amplifier A ₃Output terminal, form voltage amplifier, will amplify from the electric signal of second-order low-pass filter; Operational amplifier A ₄In-phase input end connecting resistance R ₄₂An end, its output terminal connecting resistance R ₄₂The other end, inverting input connecting resistance R ₄₃An end, resistance R ₄₃The other end be connected on resistance in series R ₄₄With R ₄₅Between, resistance R ₄₄Another termination positive source, resistance R ₄₅Another termination power cathode, form voltage comparator together; Diode D ₄₁With resistance R ₄₇After the series connection, with resistance R ₄₈Parallel connection is again with capacitor C ₄₁Series connection is formed the time-delay limiter, resistance R ₄₇, R ₄₈Resistance size, capacitor C ₄₁Capacity determined capacitor C ₄₁Charge to the supply voltage required time; Operational amplifier A ₆In-phase input end meet diode D ₆₁Negative pole, its output terminal and diode D ₆₁Positive pole link its reverse input end connecting resistance R ₆₁, with capacitor C ₆₁Form the self-locking voltage comparator together; Operational amplifier A ₅With diode D ₅₁, D ₆₂Form amplitude limiter; Operational amplifier A ₇With resistance R ₇₃, R ₇₄Form audio frequency oscillator, make direct current signal convert sound signal to; Triode BG ₁And BG ₂Form power amplifier, loudspeaker Y sends alerting signal.

With reference to Fig. 1, Fig. 2, the vibration of boiler water container is passed to vibration sensitive element 4 through sensor briquetting 5, elastic sheet metal 3, and vibration sensitive element 4 converts vibration to electric signal, by by operational amplifier A ₁Electric charge-electric pressure converter of forming enters by operational amplifier A again ₂The second-order low-pass filter of forming; Second-order low-pass filter can only allow the electric signal that those frequencies are less than or equal to the water container vibration frequency pass through, and the electric signal that is higher than the water container vibration frequency can not pass through, be that the dither (vibration frequency when frequency is higher than the boiling of boiler water container water) and the electric signal of noise vibration can not pass through, can not make the capacitor C of time-delay limiter ₄₁Voltage is amassed in formation, also just can not make the level upset of self-locking voltage comparator output; For those because of to the water container water-filling, move, move or touch the vibration that the water generates Free Slosh that makes in the container forms, be characterized in that the duration is short, vibration is violent and belong to damped vibration, though the electric signal that forms can pass through second-order low-pass filter, but the output voltage of second-order low-pass filter is risen significantly, and cause by operational amplifier A ₅Of short duration upset appears in the output level of the amplitude limiter of forming, thereby causes by operational amplifier A ₆The capacitor C of the self-locking voltage comparator of forming ₆₁Cathode voltage be increased near supply voltage, although this class energy of vibration makes capacitor C ₆₁The voltage that accumulates rise but capacitor C ₄₁The voltage that accumulates be lower than capacitor C all the time ₆₁Cathode voltage, can not make the level upset of self-locking voltage comparator output yet; In the process of heating up water, mention or put down water container, check the situation of heating up water and touch container or open the caused vibration of container cover for those with hand, big and do not have rule, time not long because of oscillation intensity, the electric signal of this class vibration can self-locking voltage comparator output level overturns, capacitor C making ₄₁The voltage that accumulates before reaching supply voltage, just disappear, so can not make the upset of self-locking voltage comparator output level yet; The electric signal that has only the vibration that causes because of the water in water container boiling to produce is through by operational amplifier A ₁Behind electric charge-electric pressure converter of forming, by by operational amplifier A ₂The second-order low-pass filter of forming enters voltage amplifier and voltage comparator, further becomes pulse voltage, and to the capacitor C of time-delay limiter ₄₁Charging makes capacitor C repeatedly ₄₁Positive voltage alternately raising gradually in the charge and discharge process, work as capacitor C ₄₁Accumulate voltage and be elevated to supply voltage the time, the output level of self-locking voltage comparator is that boiling water boiling electric signal will overturn and under lock and key, the level of self-locking voltage comparator output is via operational amplifier A ₇The audio frequency oscillator of forming converts sound signal to, via triode BG ₁And BG ₂The power amplifier of forming amplifies, and sends alerting signal by loudspeaker, inform that water is boiled, otherwise loudspeaker can not send alerting signal.

Claims

1, a kind of vibration testing type water boiling pick-up unit, form by the sender unit cap (1), the alarm speaker Y that are positioned on the sensor holder (2), vibration sensitive element (4) is equipped with in the bottom that it is characterized in that the counterbore (6) in the sensor holder (2), elastic sheet metal (3) is housed on the vibration sensitive element (4), be equipped with on the elastic sheet metal (3) pass and protrude sender unit cap (1), the briquetting (5) of the transmitting vibrations that contacts with the outer wall of boiler water container.

2, a kind of vibration testing type water boiling pick-up unit according to claim 1, it is characterized in that the vibration that the water boiling causes in the water container converts electric signal to through vibration sensitive element (4), confirm through second-order low-pass filter, amplitude limiter, after voltage amplifier, voltage comparator, time-delay limiter, self-locking voltage comparator, audio oscillator circuit, power amplifier processing, Y sends alerting signal by loudspeaker.