CN211779286U - Switch device for safe gas utilization - Google Patents

Abstract

The utility model discloses a switching device for safe gas use, including switching power supply, gas detector, solenoid valve, auxiliary relay, and time relay, wherein, switching power supply control this switching device's whole power supply, gas detector detects gas content in the gas circuit, output effective detection signal when content exceeds standard or not enough, this effective detection signal selects output effective control signal to auxiliary relay through time relay's screening, auxiliary relay carries out the biasing action according to effective control signal, the power supply of shutoff solenoid valve breaks off the gas circuit with closing the valve and stops the gas supply. The utility model discloses a time relay effectively has avoided the malfunction of the valve switch that leads to because of transient gas content fluctuation in the gas circuit to the screening of detected signal. The utility model discloses the structure is simply easily realized, with low costs and safe and reliable.

Description

Switch device for safe gas utilization

Technical Field

The utility model relates to a gas technical field is used to industrial safety, in particular to a switching device for gas is used to safety.

Background

In the field of industrial safety gas utilization, a manual ball valve is connected in a gas loop in series and used for controlling the on-off of the gas loop, but if the gas loop breaks down, the manual ball valve cannot automatically close the loop, and particularly when some flammable and explosive gas loops break down, safety accidents are easily caused. Therefore, there is a need for an easy-to-implement, low-cost, safe and reliable switching device to replace a manual ball valve for use in a gas circuit.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a switchgear for safe gas use, so as to solve the problem in the prior art that the gas circuit cannot be automatically turned off safely and effectively.

According to an aspect of the present invention, there is provided a switching device for safety gas, comprising:

the switching power supply comprises an output positive end and an output negative end;

the gas detector is connected with the switching power supply, the detection position of the gas detector is arranged in the gas loop, and the gas detector comprises an output end which outputs a detection signal corresponding to the abnormal time of the gas content;

the electromagnetic valve is arranged in the gas loop, and the negative end of the electromagnetic valve is connected with the output negative end of the switching power supply;

the power supply positive end of the intermediate relay is connected with the output positive end of the switching power supply, the output end of the intermediate relay is connected with the positive end of the electromagnetic valve, and the intermediate relay comprises a control end for controlling the power supply of the electromagnetic valve according to a control signal;

and the number of the first and second groups,

the time relay, time relay's power positive terminal and power negative terminal respectively with switching power supply's output positive terminal and output negative terminal are connected, time relay's input with the output of gas detector is connected, include with the output that intermediate relay's control end is connected.

Preferably, the switching power supply comprises a power converter, the power converter comprises a first input terminal and a second input terminal, the switching power supply receives alternating current, and the switching power supply outputs direct current.

Preferably, the method further comprises the following steps: a power switch connected in series before the first input terminal, a supply terminal of the gas detector being connected to an intermediate node of the power switch and the first input terminal.

Preferably, the gas detector comprises:

one end of the high-level detection switch is connected to the positive output end of the switching power supply, and the other end of the high-level detection switch is connected to the output end of the gas detector;

and one end of the low-level detection switch is connected to the positive output end of the switching power supply, and the other end of the low-level detection switch is connected to the output end of the gas detector.

Preferably, the gas detector is configured to switch the high detection switch or the low detection switch to the on state when the gas content of the gas circuit is higher than an upper threshold or lower than a lower threshold.

Preferably, the switch common end of the time relay is the input end of the time relay, and the switch normally open end of the time relay is the output end of the time relay.

Preferably, the switch common end of the intermediate relay is a power input end of the intermediate relay, the control negative end of the relay coil is connected to the output negative end of the switch power supply, and the switch normally-closed end is connected to the positive end of the electromagnetic valve.

Preferably, the switching device further comprises:

and the overvoltage protection module is connected with the intermediate relay and/or the electromagnetic valve.

Preferably, the overvoltage protection module comprises:

the first diode is reversely connected between the positive end and the negative end of the relay coil of the intermediate relay;

and/or a second diode connected in reverse between the positive terminal and the negative terminal of the solenoid valve.

Preferably, the overvoltage protection module comprises:

the first capacitor is connected between the positive end and the negative end of the relay coil of the intermediate relay;

and/or the second capacitor is connected between the positive end and the negative end of the electromagnetic valve.

Preferably, the switching device further comprises:

and one end of the abnormity indication unit is connected to the normally-open end of the intermediate relay, and the other end of the abnormity indication unit is connected to the output negative end of the switching power supply.

Preferably, the abnormality indication unit includes a light emitting diode and/or an alarm bell.

Preferably, the gas detector is an online gas detector for online real-time detection of the gas content of the gas circuit.

The utility model provides a switching device includes switching power supply, gas detector, solenoid valve, auxiliary relay and time relay, switching power supply is the gas detector power supply, gas detector detects the gas content in the gas circuit pipeline and exports detected signal, time relay receives this detected signal, time delay output control signal to auxiliary relay, control auxiliary relay is to the control of the power supply of solenoid valve to opening and closing, switching on or turn-off of control gas circuit of control solenoid valve. The detection signal output by the gas detector is screened by utilizing the time delay triggering characteristic of the time relay, so that the false triggering caused by the fluctuation of the gas content in the gas loop in a short time can be avoided, and the gas loop can be safely and effectively and automatically turned off.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows a schematic structural diagram of a switching device according to a preferred embodiment of the present invention.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.

Referring to fig. 1, the switching device of the preferred embodiment of the present invention includes a power switch 1, aswitching power supply 2, anonline gas detector 3, atime relay 4, anintermediate relay 5, an abnormality indication unit 6, and agas solenoid valve 7. The switchingpower supply 2 outputs direct current to supply power to other components.

The alternating current power supply live wire L is electrically connected to thefirst input end 202 of theswitching power supply 2 and the power supply livewire input end 302 of theonline gas detector 3 through the power switch 1; the ac mains neutral N is electrically connected to thesecond input 201 of theswitching power supply 2 and the mainsneutral input 301 of theonline gas detector 3. In this embodiment, the working power supply of theonline gas detector 3 is the commercial power, the first input terminal and the second input terminal of theswitching power supply 2 can receive the ac power supply of the commercial power, and directly provide the working power supply for theonline gas detector 3, and the power switch 1 can control the power supply of all the components of the switching device of this embodiment. Alternatively, the on-line gas detector 3 may employ a dc type working power supply, which is supplied from theswitching power supply 2. Theswitch power supply 2 can be an AC-to-DC power converter, converts an AC power supply into a DC power supply, and the power switch 1 controls the existence of an input power supply of theswitch power supply 2 so as to control whether theswitch power supply 2 outputs; theswitching power supply 2 may also be a transformer, and its input voltage source may be a direct current source; the power switch 1 controls whether theswitching power supply 2 has current input or not, and further controls whether the switching power supply has output or not.

Theinput end 303 of the high-level detection switch 32 and theinput end 304 of the low-level detection switch 31 of theonline gas detector 3 are electrically connected in parallel and then electrically connected with the positive output end of theswitching power supply 2. Theoutput terminal 305 of the high-level detection switch 32 and theoutput terminal 306 of the low-level detection switch 31 of theonline gas detector 3 are electrically connected in parallel to form an output terminal of theonline gas detector 3 for outputting a detection signal corresponding to the abnormal time of the gas content, and are electrically connected to the switchcommon terminal 402 of thetime relay 4. The detection position (including high position and low position) of theonline gas detector 3 is embedded into the gas loop to detect the gas content in the gas loop online in real time, and outputs a detection signal to the switchcommon terminal 402 of thetime relay 4. The on-time of thehigh detection switch 32 and thelow detection switch 31 is the same as the gas content abnormal time in the gas loop, that is, the effective duration of the detection signal output by the gas detector is the same as the gas content abnormal duration, and when thehigh detection switch 32 or thelow detection switch 31 is on, the detection signal is effective and is at a high level.

Wherein, due to drawing limitations, a gas circuit, which may be a gas delivery conduit, is not drawn in the figures. The detection position of theonline gas detector 3 may be a flow sensor, which is placed in a gas loop to detect the gas flow, and the detection value is transmitted back to theonline gas detector 3 to control the on/off of thehigh detection switch 32 and thelow detection switch 31.

The power supplypositive end 401 of thetime relay 4 is electrically connected with the output positive end of theswitching power supply 2; the power supplynegative terminal 404 of thetime relay 4 is electrically connected to the output negative terminal of theswitching power supply 2, and the switching normally-onterminal 403 of thetime relay 4 outputs a control signal. In the present embodiment, thecommon switch terminal 402 of thetime relay 4 is an input terminal of thetime relay 4, and the normallyopen switch terminal 403 is an output terminal.

A relay coilpositive end 501 of theintermediate relay 5 is electrically connected with a switch normally-open end 403 of thetime relay 4; the relay coilnegative terminal 502 of theintermediate relay 5 is electrically connected to the output negative terminal of theswitching power supply 2. The switchcommon terminal 503 of theintermediate relay 5 is a power supply positive terminal, i.e., a power supply input terminal, of theintermediate relay 5 and is electrically connected to an output positive terminal of theswitching power supply 2. The relay coilpositive terminal 501 of theintermediate relay 5 is a control positive terminal and receives the control signal output by thetime relay 4, and the relay coilnegative terminal 502 of theintermediate relay 5 is a control negative terminal and forms a control loop with the positive terminal.

Preferably, the relay coilpositive terminal 501 of theintermediate relay 5 and the relay coilnegative terminal 502 of theintermediate relay 5 are electrically connected in reverse and have a diode D1, which can be used as an overvoltage protection, and the diode of the overvoltage protection can also be a capacitor.

Apositive terminal 601 of the abnormality indication unit 6 is electrically connected to a switch normally-open terminal 506 of theintermediate relay 5; thenegative terminal 602 of the abnormality indication unit 6 is electrically connected to the output negative terminal of theswitching power supply 2.

Thepositive terminal 701 of thegas solenoid valve 7 is electrically connected to the normally closedswitch terminal 505 of theintermediate relay 5, and the normally closedswitch terminal 505 of theintermediate relay 5 is the output terminal of theintermediate relay 5. Thenegative terminal 702 of thegas solenoid valve 7 is electrically connected to the output negative terminal of the switchingpower supply 2. In the embodiment, the electromagnetic valve is a gas electromagnetic valve, so that the safety is guaranteed by electric separation.

Preferably, the relay coilpositive terminal 701 of thegas solenoid valve 7 and the relay coilnegative terminal 702 of thegas solenoid valve 7 are electrically connected in reverse and connected with a diode D2, which can be used as an overvoltage protection, and the diode of the overvoltage protection can also be a capacitor.

The switchingpower supply 2 supplies power to other parts; theonline gas detector 3 detects the gas content in the gas loop on line in real time, and outputs a detection signal according to the set upper limit and lower limit, wherein the detection signal is a level signal; thetime relay 4 carries out time delay processing on the detection signal, and avoids the error output of the detection signal output due to the instability of the gas content in the gas loop; theintermediate relay 5 controls the power supply circuit of thegas solenoid valve 7 and the power supply circuit of the abnormality indication unit 6.

In the preferred embodiment of the present invention, when the power switch 1 is closed, the switching power supply 2 supplies power to operate, the online gas detector 3 is powered to operate to detect the gas content in the gas loop on line, the switch common terminal 503 of the intermediate relay 5 is powered by the positive output terminal of the switching power supply 2 and is conducted to the normally closed terminal 505, the normally closed terminal 505 is connected to the power supply input terminal 701 of the gas solenoid valve 7 to supply power to the gas solenoid valve, the gas solenoid valve is opened, the gas loop is conducted, at this time, the gas content is low because the gas loop is just ventilated, the low-level detection switch 31 of the online gas detector 3 is closed, the online gas detector 3 outputs an abnormal signal to the switch common terminal 402 of the time relay 4, so that the switch common terminal 402 has a high level, because of the timing delay effect of the time relay 4, the switch is not biased from the normally closed terminal to the normally open terminal 403, so that the relay coil positive terminal, the switch of the intermediate relay 5 is biased to be conducted with a normally closed end 505, the gas electromagnetic valve 7 is powered, and the valve is opened to enable the gas loop to be in a conducting state; when the gas content in the gas circuit continuously exceeds the upper threshold, the high-level detection switch 32 of the on-line gas detector 3 is closed, or the first lower threshold is set, the low-level detection switch 31 is turned on, the on-line gas detector 3 outputs a high level to the switching common 402 of the time relay 4, when the high level is continuously active until the time delay time preset by the time relay 4 is reached, the switch bias of the time relay 4 turns on the normally open end 403, the normally open end 403 outputs a high level to the relay coil positive end 501 of the intermediate relay 5, so that the switch bias of the intermediate relay 5 changes, the normally closed end 505 of the intermediate relay 5 is disconnected, the normally open end 506 is connected, at this time, the gas solenoid valve 7 is not powered, the valve is closed, the gas circuit is disconnected, meanwhile, a positive input 601 of the abnormality indication means 6 is connected to the normal end 506 and has power supplied thereto, thereby displaying an abnormality.

And, the utility model discloses in the preferred embodiment, when switch 1 disconnection, on-line gas detector 3,time relay 4,auxiliary relay 5, unusual indicating unit 6 andgas solenoid valve 7 lose the power supply, and the valve ofgas solenoid valve 7 is for closing under the no power supply condition, and when switch 1 disconnection promptly, the gas return circuit is for blocking the state, uses the gas stop supply, can facilitate for the daily maintenance gas circuit.

Further, when the voltage difference between the relay coilpositive terminal 501 and the relay coilnegative terminal 502 of theintermediate relay 5 is too large to possibly damage theintermediate relay 5, the diode D1 reverse-breaks the relay coil of the short-circuitingintermediate relay 5 to protect theintermediate relay 5, and the diode D2 reverse-breaks the relay coil of the short-circuitinggas solenoid valve 7 to protect thegas solenoid valve 7 when the voltage difference between the positive and negative terminals of thegas solenoid valve 7 is too large.

Among them, the diode D1 and the diode D2 are used for overvoltage protection, and overvoltage protection thereof is not limited to the use of diodes, and for example, capacitors may be used instead of the diode D1 and the diode D2.

Further, the abnormality indication unit 6 is a light emitting diode, and when the gas content in the gas circuit is insufficient or exceeds the standard, theintermediate relay 5 is biased to conduct the normallyopen end 506, so that the light emitting diode of the abnormality indication unit 6 is turned on to indicate abnormality, or the abnormality indication unit is an alarm bell, and the alarm bell indicates abnormality when the gas content in the gas circuit is abnormal.

Above the unusual gas content that includes gas circuit exceeds standard and not enough two kinds of situations,online gas detector 3 adopts the ripe product on the market to ensure the high accuracy and the high reliability that detect, real-time to using gas condition monitoring, make when using gas to exceed standard the utility model discloses preferred embodiment's switching device accuracy cuts off the air feed, prevents to take place the incident.

In accordance with the present invention, as set forth above, these embodiments do not set forth all of the details nor limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.

Claims (13)

1. A switch device for the safe use of gas, comprising:

the switching power supply comprises an output positive end and an output negative end;

the gas detector is connected with the switching power supply, the detection position of the gas detector is arranged in the gas loop, and the gas detector comprises an output end which outputs a detection signal corresponding to the abnormal time of the gas content;

the electromagnetic valve is arranged in the gas loop, and the negative end of the electromagnetic valve is connected with the output negative end of the switching power supply;

the power supply positive end of the intermediate relay is connected with the output positive end of the switching power supply, the output end of the intermediate relay is connected with the positive end of the electromagnetic valve, and the intermediate relay comprises a control end for controlling the power supply of the electromagnetic valve according to a control signal;

and the number of the first and second groups,

the time relay, time relay's power positive terminal and power negative terminal respectively with switching power supply's output positive terminal and output negative terminal are connected, time relay's input with the output of gas detector is connected, include with the output that intermediate relay's control end is connected.

2. The switching device according to claim 1,

the switching power supply comprises a power converter, the power converter comprises a first input end and a second input end, the switching power supply receives alternating current, and the switching power supply outputs direct current.

3. The switching device according to claim 2, further comprising:

a power switch connected in series before the first input terminal, a supply terminal of the gas detector being connected to an intermediate node of the power switch and the first input terminal.

4. The switching device of claim 1, wherein the gas detector comprises:

one end of the high-level detection switch is connected to the positive output end of the switching power supply, and the other end of the high-level detection switch is connected to the output end of the gas detector;

and one end of the low-level detection switch is connected to the positive output end of the switching power supply, and the other end of the low-level detection switch is connected to the output end of the gas detector.

5. The switching device according to claim 4,

and when the gas content of the gas loop is higher than an upper threshold or lower than a lower threshold, the high-level detection switch or the low-level detection switch is in a conducting state respectively.

6. The switching device according to claim 1,

the switch common end of the time relay is the input end of the time relay, and the switch normally open end of the time relay is the output end of the time relay.

7. The switching device according to claim 1,

the switch common end of the intermediate relay is the power input end of the intermediate relay, the control negative end of the relay coil is connected to the output negative end of the switch power supply, and the switch normally-closed end is connected to the positive end of the electromagnetic valve.

8. The switching device according to claim 1, further comprising:

and the overvoltage protection module is connected with the intermediate relay and/or the electromagnetic valve.

9. The switching device of claim 8, wherein the overvoltage protection module comprises:

the first diode is reversely connected between the positive end and the negative end of the relay coil of the intermediate relay;

and/or a second diode connected in reverse between the positive terminal and the negative terminal of the solenoid valve.

10. The switching device of claim 8, wherein the overvoltage protection module comprises:

the first capacitor is connected between the positive end and the negative end of the relay coil of the intermediate relay;

and the second capacitor is connected between the positive end and the negative end of the electromagnetic valve.

11. The switching device according to claim 1, further comprising:

and one end of the abnormity indication unit is connected to the normally-open end of the intermediate relay, and the other end of the abnormity indication unit is connected to the output negative end of the switching power supply.

12. The switching device according to claim 11,

the abnormality indicating unit includes a light emitting diode and/or an alarm bell.

13. The switching device according to claim 1,

the gas detector is an online gas detector and is used for detecting the gas content of the gas loop in real time online.

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