CN206192469U - Gas flowmeter fault finding circuit - Google Patents

Abstract

The utility model discloses a gas flowmeter fault finding circuit, including power, the control unit, first transformer, the second transformer, a controllable switch, the 2nd controllable switch and pilot lamp, the both ends of power are connected with gas flowmeter's power consumptive component both ends and are constituted the return circuit, the control unit is connected with first transformer, the second transformer, a controllable switch, the 2nd controllable switch and pilot lamp respectively, and first transformer inserts the positive pole of power, and the second transformer inserts the negative pole of power, and on a controllable switch set up the route between first transformer and power, the 2nd controllable switch set up on the route between the second transformer and power. The utility model has the advantages of simple structure, low cost, convenient to use, when the gas flowmeter stop work, through the utility model discloses the problem that the problem that can open circuit effectively fast or power electric quantity are not enough has reduced fault finding's the degree of difficulty, has improved work efficiency.

Description

A kind of gas flowmeter malfunction elimination circuit

Technical field

The utility model is related to a kind of detection circuit, and in particular to a kind of malfunction elimination circuit for gas flowmeter.

Background technology

Gas flowmeter is the instrument that a kind of use calorifics principle carries out gas flow measurement, its mainly by bridge circuit and Output signal conditioning circuit is constituted, by flow-sensitive element (such as RTD, platinum filament or platinum film) and temperature compensating element It is installed in gas passage, and bridge circuit is constituted with other resistive elements, the change of gas flow is converted into bridge arm defeated Go out the change of voltage, so as to realize the purpose of gas flow measurement.Consuming components inside gas flowmeter are mainly carried by power supply For operating voltage.In use when consuming components are stopped, under normal circumstances staff be difficult judge because There is open circuit also because the not enough power supply of power supply, malfunction elimination difficulty is larger, and operating efficiency is relatively low in supply path.

Utility model content

The purpose of this utility model is to provide a kind of gas flowmeter malfunction elimination circuit, and it has simple structure, cost Advantage cheap, easy to use, when gas flowmeter is stopped, can fast and effeciently judge it is disconnected by the utility model Road problem or the not enough problem of electric quantity of power supply, reduce the difficulty of malfunction elimination, improve operating efficiency.

To solve in the prior art, when consuming components are stopped in gas flowmeter, malfunction elimination difficulty is big, work effect The low problem of rate, the utility model provides a kind of gas flowmeter malfunction elimination circuit, including power supply, control unit, first Transformer, the second transformer, the first gate-controlled switch, the second gate-controlled switch and indicator lamp, wherein, the two ends of the power supply and gas The consuming components two ends of flowmeter connect and constitute loop；Described control unit respectively with the first transformer, the second transformer, One gate-controlled switch, the second gate-controlled switch and indicator lamp connection, the first transformer access the positive pole of power supply, and the second transformer accesses electricity The negative pole in source, the first gate-controlled switch is arranged on the path between the first transformer and power supply, and the second gate-controlled switch is arranged on On path between two transformers and power supply.

Further, a kind of gas flowmeter malfunction elimination circuit of the utility model, wherein, also including sampling resistor list Unit, the two ends of the sampling resistor unit are connected with the consuming components two ends of gas flowmeter, and make sampling resistor unit with control Unit connection processed.

Further, a kind of gas flowmeter malfunction elimination circuit of the utility model, wherein, the sampling resistor unit bag Include the resistance R1 and resistance R2 of series connection.

Further, a kind of gas flowmeter malfunction elimination circuit of the utility model, wherein, described control unit is monolithic Machine or DSP.

Further, a kind of gas flowmeter malfunction elimination circuit of the utility model, wherein, first gate-controlled switch and Second gate-controlled switch is transistor, MOSFET or metal-oxide-semiconductor.

A kind of gas flowmeter malfunction elimination circuit of the utility model has advantages below：The utility model is by setting electricity Source, control unit, the first transformer, the second transformer, the first gate-controlled switch, the second gate-controlled switch and indicator lamp, allow power supply Two ends are connected with the consuming components two ends of gas flowmeter and constitute loop；Allow control unit respectively with the first transformer, second The connection of transformer, the first gate-controlled switch, the second gate-controlled switch and indicator lamp, and the first transformer is accessed the positive pole of power supply, make Second transformer accesses the negative pole of power supply, and the first gate-controlled switch is arranged on the path between the first transformer and power supply, Second gate-controlled switch is arranged on the path between the second transformer and power supply.Thus a kind of simple structure, cost are just constituted Gas flowmeter malfunction elimination circuit cheap, easy to use.When the consuming components in gas flowmeter power off suddenly stopping work When making, its reason is mainly following two situations, and one is supply path open circuit, and two is that electric quantity of power supply is not enough or power supply is removed. The utility model sends control to the first gate-controlled switch and the second gate-controlled switch simultaneously in actual application by control unit Signal processed, the positive pole for making the first transformer switch on power, the negative pole for making the second transformer switch on power, and sent out to the first transformer Carrier signal is sent, the carrier signal will be transmitted along supply path, the second transformer is used to receive the carrier signal and transfer back to Control unit.When control unit can receive carrier signal, then explanation is that supply path is connection, and reason is power supply Not enough power supply or power supply are removed；Now control unit does not send control signal to indicator lamp, and indicator lamp is in the state that do not work.Work as control When unit processed is not received by carrier signal, then explanation is the problem of supply path open circuit；Now control unit is sent out to indicator lamp Control signal is sent, makes it be in lightened state, to remind staff.By above procedure, when the power consumption unit in gas flowmeter When part is stopped, staff can quickly determine supply path open circuit or electric quantity of power supply deficiency or the original being removed Cause, reduces malfunction elimination difficulty, improves operating efficiency.

Illustrated embodiment makees further to a kind of gas flowmeter malfunction elimination circuit of the utility model below in conjunction with the accompanying drawings Describe in detail：

Brief description of the drawings

Fig. 1 is a kind of schematic diagram of gas flowmeter malfunction elimination circuit of the utility model；

Fig. 2 is the schematic diagram of sampling resistor in a kind of gas flowmeter malfunction elimination circuit of the utility model；

Wherein, 1, power supply；2nd, control unit；3rd, the first transformer；4th, the second transformer；5th, the first gate-controlled switch；6th, Two gate-controlled switches；7th, indicator lamp；8th, sampling resistor unit；9th, gas flowmeter consuming components.

Specific embodiment

A kind of specific embodiment of gas flowmeter malfunction elimination circuit of the utility model as depicted in figs. 1 and 2, including Power supply 1, control unit 2, the first transformer 3, the second transformer 4, the first gate-controlled switch 5, the second gate-controlled switch 6 and indicator lamp 7. The two ends of power supply 1 are allowed to be connected and constitute loop with the two ends of consuming components 9 of gas flowmeter；Allow control unit 2 respectively with first Transformer 3, the second transformer 4, the first gate-controlled switch 5, the second gate-controlled switch 6 and indicator lamp 7 are connected, and make the first transformer 3 The positive pole of power supply 1 is accessed, the second transformer 4 is accessed the negative pole of power supply 1, the first gate-controlled switch 5 is arranged on the first transformer 3 And on the path between power supply 1, the second gate-controlled switch 6 is arranged on the path between the second transformer 4 and power supply 1.Pass through Above structure setting just constitutes a kind of simple structure, flowmeter body malfunction elimination circuit with low cost, easy to use.In reality In the application of border, when power-off is stopped the consuming components in gas flowmeter suddenly, its reason is mainly following two situations, One is supply path open circuit, and two is that electric quantity of power supply is not enough or power supply is removed.The utility model is by control unit 2 simultaneously to the One gate-controlled switch 5 and the second gate-controlled switch 6 send control signal, make the first transformer 3 switch on power 1 positive pole, make the second change Depressor 4 switch on power 1 negative pole, and send carrier signal to the first transformer 3, the carrier signal will pass along supply path Defeated, the second transformer 4 is used to receive the carrier signal and transfers back to control unit 2.When control unit 2 can receive carrier wave letter Number when, then explanation is that supply path is connection, and reason is that electric quantity of power supply is not enough or power supply is removed；Now control unit 2 Control signal is not sent to indicator lamp 7, indicator lamp 7 is in the state that do not work.When control unit 2 is not received by carrier signal, then Explanation is the problem of supply path open circuit；Now control unit 2 sends control signal to indicator lamp 7, makes it be in lightened state, with Remind staff.By above procedure, when the consuming components in gas flowmeter are stopped, staff can be quick Ground determines it is the reason for supply path is opened a way or electric quantity of power supply is not enough or is removed, and reduces malfunction elimination difficulty, improves Operating efficiency.

Used as prioritization scheme, this specific embodiment is also provided with sampling resistor unit 8, allows the two of sampling resistor unit 8 End is connected with the two ends of consuming components 9 of gas flowmeter, and sampling resistor unit 8 is connected with control unit 2.Sampling resistor list Unit 8 specifically includes the resistance R1 and resistance R2 of series connection.In actual applications, the utility model is detected by sampling resistor unit 8 The working condition of consuming components in gas flowmeter, and detection signal is fed back into control unit 2, when power consumption in gas flowmeter Element cannot normal work when, control unit 2 can according to detection signal to the first gate-controlled switch 5, the second gate-controlled switch and First transformer 3 sends corresponding control signal, actively for staff provides malfunction elimination foundation, further enhancing practicality Property.

Used as specific embodiment, the control unit 2 in the utility model can use single-chip microcomputer or DSP, and first controllable opens The gate-controlled switch 6 of pass 5 and second can use transistor, MOSFET or metal-oxide-semiconductor, be capable of achieving technical purpose of the present utility model.

Above example is only the description carried out to preferred embodiment of the present utility model, not please to the utility model The restriction for asking protection domain to carry out, on the premise of the utility model design principle and spirit is not departed from, this area engineering technology The various forms of deformations that personnel make according to the technical solution of the utility model, all should fall into claim of the present utility model In the protection domain that book determines.

Claims (5)

1. a kind of gas flowmeter malfunction elimination circuit, including power supply (1), control unit (2), the first transformer (3), second become Depressor (4), the first gate-controlled switch (5), the second gate-controlled switch (6) and indicator lamp (7), it is characterised in that the two of the power supply (1) End is connected with the consuming components two ends of gas flowmeter and constitutes loop；Described control unit (2) respectively with the first transformer (3), the connection of the second transformer (4), the first gate-controlled switch (5), the second gate-controlled switch (6) and indicator lamp (7), the first transformer (3) positive pole of power supply (1) is accessed, the second transformer (4) accesses the negative pole of power supply (1), and the first gate-controlled switch (5) is arranged on first On path between transformer (3) and power supply (1), the second gate-controlled switch (6) be arranged on the second transformer (4) and power supply (1) it Between path on.

2. according to a kind of gas flowmeter malfunction elimination circuit described in claim 1, it is characterised in that also including sampling resistor Unit (8), the two ends of the sampling resistor unit (8) are connected with the consuming components two ends of gas flowmeter, and make sampling resistor Unit (8) is connected with control unit (2).

3. according to a kind of gas flowmeter malfunction elimination circuit described in claim 2, it is characterised in that the sampling resistor list First (8) resistance R1 and resistance R2 including series connection.

4. according to a kind of gas flowmeter malfunction elimination circuit described in claim 3, it is characterised in that described control unit (2) it is single-chip microcomputer or DSP.

5. according to a kind of gas flowmeter malfunction elimination circuit described in claim 4, it is characterised in that described first controllable opens Close (5) and the second gate-controlled switch (6) be transistor, MOSFET or metal-oxide-semiconductor.