CN217333151U - Switching device - Google Patents
Switching device Download PDFInfo
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- CN217333151U CN217333151U CN202221286478.1U CN202221286478U CN217333151U CN 217333151 U CN217333151 U CN 217333151U CN 202221286478 U CN202221286478 U CN 202221286478U CN 217333151 U CN217333151 U CN 217333151U
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- relay
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- triode
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Abstract
The utility model provides a switching device, which comprises a switch driving circuit and a first relay circuit; the switch driving circuit comprises a diode D2, a normally open switch SW1, resistors R1, R2 and an NPN triode Q1; the first relay circuit comprises a relay K1, a diode D1; the anode of the diode D2 is connected with the input end BAT of the power supply and one end of the normally open contact K1-1 of the relay K1; the cathode of the diode D2 is connected with one end of a normally-open switch SW1, one end of a coil of the relay K1 and the cathode of the diode D1, and the other end of the coil of the relay K1 is connected with the anode of the diode D1 and the collector of the triode Q1; the other end of the normally open contact K1-1 of the relay K1 is connected with a first output end NO 1; the other end of the normally-open switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the base of the triode Q1 and one end of a resistor R1, and the other end of the resistor R1 and the emitter grounding wire GND of the triode Q1. The utility model discloses can realize opening to opening of a plurality of vacuum pumps and stop control.
Description
Technical Field
The utility model relates to a controlling means of pump, especially a switching device.
Background
When a fire breaks out, the fire fighting truck can arrive at the fire scene for fire extinguishing in the first time. The urban area generally has laid the fire control pipeline, and the hosepipe in fire engine area can connect the fire control pipeline to get water, but does not have the fire control pipeline in some remote areas, can only get water from river course or pond through the water pump after the fire engine reachs the scene.
In order to enable the water pump to output water as soon as possible, a vacuum pump is generally needed to pump air to the water pump pipeline, and after negative pressure is formed in the water pump pipeline, water can be sucked and sprayed, and the water pump is put into operation.
In the field, the vacuum pump can only work by the power supply (usually DC) on the fire engine, so it is necessary to design a switching device capable of using the power supply on the fire engine to start and stop the vacuum pump.
Disclosure of Invention
To the not enough of existence among the prior art, the embodiment of the utility model provides a switching device, its circuit is simple reliable, can be used for starting and closing the vacuum pump. In order to realize the technical purpose, the embodiment of the utility model provides an adopt technical scheme is:
the embodiment of the utility model provides a switching device, including switch drive circuit and first relay circuit;
the switch driving circuit comprises a diode D2, a normally-open switch SW1, resistors R1, R2 and an NPN triode Q1;
the first relay circuit comprises a relay K1, a diode D1;
the anode of the diode D2 is connected with the power input terminal BAT and one end of the normally open contact K1-1 of the relay K1; the cathode of the diode D2 is connected with one end of a normally-open switch SW1, one end of a coil of the relay K1 and the cathode of the diode D1, and the other end of the coil of the relay K1 is connected with the anode of the diode D1 and the collector of the triode Q1; the other end of the normally open contact K1-1 of the relay K1 is connected with a first output end NO 1; the other end of the normally open switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the base of a triode Q1 and one end of a resistor R1, and the other end of the resistor R1 and the emitter ground GND of a triode Q1.
More preferably, a thermistor PTC1 is connected between the other end of the normally open contact K1-1 of the relay K1 and the first output end NO 1.
Specifically, the normally open switch SW1 is a push button switch.
More preferably, the switching device further comprises a second relay circuit; the second relay circuit comprises a relay K2, one end of a coil of the relay K2 is connected with a cathode of a diode D1, and the other end of a coil of the relay K2 is connected with an anode of a diode D1 and a collector of a triode Q1; one end of a normally open contact K2-1 of the relay K2 is connected with the power input terminal BAT, and the other end is connected with the second output terminal NO 2.
Preferably, a thermistor PTC2 is further connected between the other end of the normally open contact K2-1 of the relay K2 and the second output end NO 2.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
1) the circuit works reliably, and the start and stop control of a plurality of vacuum pumps can be realized only by one button switch.
2) And an overcurrent thermal protection device is arranged to prevent faults caused by short circuit.
Drawings
Fig. 1 is an electrical schematic diagram of a switching device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, an embodiment of the present invention provides a switching device, including a switch driving circuit 100 and a first relay circuit 200;
the switch driving circuit 100 comprises a diode D2, a normally-open switch SW1, resistors R1 and R2 and an NPN triode Q1;
the first relay circuit 200 includes a relay K1, a diode D1;
the anode of the diode D2 is connected with the input end BAT of the power supply and one end of the normally open contact K1-1 of the relay K1; the cathode of the diode D2 is connected with one end of a normally-open switch SW1, one end of a coil of the relay K1 and the cathode of the diode D1, and the other end of the coil of the relay K1 is connected with the anode of the diode D1 and the collector of the triode Q1; the other end of the normally open contact K1-1 of the relay K1 is connected with a first output end NO 1; the other end of the normally-open switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the base of a triode Q1 and one end of a resistor R1, and the other end of a resistor R1 and the emitter grounding wire GND of a triode Q1;
as the optimization of the embodiment, a thermistor PTC1 is further connected between the other end of the normally open contact K1-1 of the relay K1 and the first output terminal NO 1; the thermistor PTC1 can provide overheat protection function when overcurrent;
specifically, the normally open switch SW1 is a push button switch;
when the switch device is used, the power supply input terminal BAT of the switch device is connected with the positive pole of a direct current power supply, for example +24v, and the grounding wire GND of the switch device is connected with the negative pole of the direct current power supply; connecting a first output end NO1 to the positive input end of the vacuum pump, and connecting a ground wire GND to the negative input end of the vacuum pump; the normally open switch SW1 is pressed down and closed, the triode Q1 is conducted, the coil of the relay K1 is electrified, the normally open contact K1-1 of the relay K1 is closed, the power input end BAT is communicated with the first output end NO1, and power is supplied to the vacuum pump through the first output end NO 1; after the vacuum pump works for a short time, negative pressure in a water pump pipeline is formed, the water pump loosens the normally open switch SW1 after normally absorbing water and spraying water, the normally open switch SW1 is disconnected, the triode Q1 is disconnected, the coil of the relay K1 is powered off, the normally open contact K1-1 of the relay K1 is disconnected, the power input end BAT is disconnected with the first output end NO1, and the vacuum pump stops working; the diode D1 plays a role of follow current when the coil of the relay K1 is in power failure, and the coil of the relay K1 is prevented from being burnt;
as a refinement of the present embodiment, the switching device further includes a second relay circuit 300; the second relay circuit 300 comprises a relay K2, one end of a coil of the relay K2 is connected with a cathode of a diode D1, and the other end of a coil of the relay K2 is connected with an anode of a diode D1 and a collector of a triode Q1; one end of a normally open contact K2-1 of the relay K2 is connected with the power input terminal BAT, and the other end of the normally open contact K2 is connected with the second output terminal NO 2;
as the optimization of the embodiment, a thermistor PTC2 is further connected between the other end of the normally open contact K2-1 of the relay K2 and the second output terminal NO 2; the thermistor PTC2 can provide overheat protection function when overcurrent;
the second relay circuit 300 operates on the same principle as the first relay circuit 200;
through two relay circuit simultaneous workings, can drive two vacuum pumps simultaneously, just can provide stronger evacuation ability to a water pump pipeline, perhaps carry out the evacuation to two water pump pipelines simultaneously.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (5)
1. A switching device, characterized by comprising a switch drive circuit (100) and a first relay circuit (200);
the switch driving circuit (100) comprises a diode D2, a normally-open switch SW1, resistors R1 and R2 and an NPN triode Q1;
the first relay circuit (200) comprises a relay K1, a diode D1;
the anode of the diode D2 is connected with the power input terminal BAT and one end of the normally open contact K1-1 of the relay K1; the cathode of the diode D2 is connected with one end of a normally-open switch SW1, one end of a coil of the relay K1 and the cathode of the diode D1, and the other end of the coil of the relay K1 is connected with the anode of the diode D1 and the collector of the triode Q1; the other end of the normally open contact K1-1 of the relay K1 is connected with a first output end NO 1; the other end of the normally-open switch SW1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the base of the triode Q1 and one end of a resistor R1, and the other end of the resistor R1 and the emitter grounding wire GND of the triode Q1.
2. The switching device according to claim 1,
and a thermistor PTC1 is also connected between the other end of the normally open contact K1-1 of the relay K1 and the first output end NO 1.
3. The switching device according to claim 1,
the normally open switch SW1 is a push button switch.
4. The switching device according to claim 1, 2 or 3,
the switching device further comprises a second relay circuit (300); the second relay circuit (300) comprises a relay K2, one end of a coil of a relay K2 is connected with a cathode of a diode D1, and the other end of a coil of a relay K2 is connected with an anode of a diode D1 and a collector of a triode Q1; one end of a normally open contact K2-1 of the relay K2 is connected with the power input terminal BAT, and the other end is connected with the second output terminal NO 2.
5. The switching device according to claim 4,
and a thermistor PTC2 is also connected between the other end of the normally open contact K2-1 of the relay K2 and the second output end NO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286478.1U CN217333151U (en) | 2022-05-25 | 2022-05-25 | Switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286478.1U CN217333151U (en) | 2022-05-25 | 2022-05-25 | Switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217333151U true CN217333151U (en) | 2022-08-30 |
Family
ID=82986794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221286478.1U Active CN217333151U (en) | 2022-05-25 | 2022-05-25 | Switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217333151U (en) |
-
2022
- 2022-05-25 CN CN202221286478.1U patent/CN217333151U/en active Active
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