CN2157334Y

CN2157334Y - Idle motion testing device for pump

Info

Publication number: CN2157334Y
Application number: CN 93210427
Authority: CN
Inventors: 李木春
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-04-20
Filing date: 1993-04-20
Publication date: 1994-02-23
Anticipated expiration: 2003-04-20

Abstract

The utility model belongs to an idle motion testing device for a pump. Whether a running pump is in idle motion or not is continuously detected by a control circuit through switching the contact point of a pressure switch, so the pump is controlled by a power supply to go on running, stop running and repeat automatic start in definite time until pumping mission is accomplished. The utility model can prevent the pump from the damage which is caused by idle rotation for a long time, and can automatically wait until the water supply of a water sucking end is normal in order to start again to run and accomplish pumping mission smoothly. The utility model is really an economical, practical and novel idle motion testing device for a pump.

Description

Idle motion testing device for pump

The utility model relates to a kind of detection device of pump idle running, switching via the pressure switch contact, see through one group of pump in the running of control circuit continuous detecting and whether be idling conditions, pump is done to remain in operation or shut down and the regularly automatically actuated power supply control of repetitiousness, till the pumping task is finished.The utility model and can wait the suction side automatically and supply water and just often continue to start running except that can preventing infringement that pump is caused because of long-time idle running, finishes the pumping task smoothly and is one the detection device of the novel pump idle running of economical and practical value to be arranged.

Pump or uses in the agro-industrial mining industry in people's daily life, and finding is arranged more, takes out feedwater such as or carries the liquid material, and non-dependence pump is difficult to be merit, and is so the function of pump how, real-valued that people pay close attention to.

Except fault, pump is abstained from most, is the idle running problem, and the reason of generation idle running is roughly pump suction side shortcoming startup water or supply water interruption and formation idle running, and is as if overcoming by self-priming pump, also only helpful to last situation.

One situation groundwater abstraction or pump tap water in the pumping process of high building wet pit when dry season then, the situation regular meeting of this idle running takes place, and causes expending electric power in vain and making motor impaired, even produces contingency.And general level controller can not directly be suitable for, so this defective exists always above-mentioned situation (being water level and the interior water level of running water pipe in the well).

In recent years, have the detective device of improved type electrode bar type to be pushed out application, it is the water supply condition of mat electrode senses pump suction side, with the on-off of control pump power supply, prevents pump idle running.

Yet this detective device still has following defective on reality is used:

1. the electrode bar fixed base is inboard directly contacts with supplying water, and often mistake occurs detecting because of excessive moisture causes misleading between electrode bar electricity.

2. when water supply flow velocity in water source slows down, stop when taking out during pump, take out and stop action when too frequent, easily damage motor and make and break contact, and the water meter counting can be dark influenced and inaccuracy.

3. must revise pump suction side pipeline when installing above-mentioned detective device additional.

So the claimant is in line with all the year round observation, research in detail, and then develop the detection device of the pump idle running of this case.

For the concrete technology contents that further discloses this case, the utility model will be further described now to consult accompanying drawing.

Fig. 1 is the front view after this case embodiment's the assembling.

Fig. 2 is the side view after this case embodiment's the assembling.

Fig. 3 is the control circuit figure of this case.

As shown in the figure, basically, the detection device of pump idle running of the present utility model is by a pump 1, one pressure switch 2, and one group of control circuit 3 combines.

Wherein, pump 1 is known device, sees through the running of motor drives pump, can reach the function of suction and force feed.

Pressure switch 2 is a well known device also, is to utilize pump priming hole installing, when pump 1 runs well, is formed pressure and is made electric current contact form path by the pumping current, in case just open circuit because of decompression when dallying.

Control circuit 3 comprises two energising delayed type time-limit relays (TRa) 31, (TRb) 32, two general relay roads (R1) 33, (R2) 34 be together with water level switch contact (Ls) 35 and pressure switch contact (Ps) 36 etc., forms as the control circuit 3 shown in Fig. 3 dotted line.When combination, complete " detection control apparatus of pump idle running " of this case as shown in Figure 3 then.Be the convenient technology contents that this case is described in detail in detail, special that symbol description shown in Figure 3 is as follows:

Time-limit relay (TRa) 31, time-limit relay (TRa) coil 311, a contact 312 in limited time; b contact 313 in limited time, time-limit relay (TRb) 32, time-limit relay (TRb) coil 321; a contact 322 in limited time, b contact 323 in limited time, general relay (R1) 33; general relay (R1) coil 331; b contact 332, general relay (R2) 34, general relay (R2) coil 341; b contact 342; water level switch contact (Ls) 35, pressure switch contact (Ps) 36, beacon (L) 37; magnetic switch MC; solenoid winding 38, motor and pump assembly M, overload protective device TH-RY; no-fuse switch N.B., phase three-wire three formula electric wire R.S.T.

When implementing, at first can connect because of lack of water by level of tail water make and break contact (Ls) 35, then coil 311 energisings of time-limit relay (TRa) 31, its b contact 313 of prescribing a time limit is connected and is begun according to the Preset Time timing, magnetic switch (MC) coil 38 is connected simultaneously, the contactor contact is connected, motor starting, pump 1 entry into service.(time-limit relay (TRb) 32 is failure to actuate for coil 341 energisings of at this moment general relay (R2) 34, its b contact 342 open circuits), this moment, each contact moved as following table:

The element title	The contact title	Action	Remarks
				Water level switch contact (Ls) 35	The a contact	Connect
Time-limit relay (TRa) 31	Coil 311	Connect
				Time-limit relay (TRa) 31	B contact 313 in limited time	Connect	(during tester) picks up counting
Magnetic switch (MC)	Coil 38	Connect
				Magnetic switch (MC)	The contactor contact	Connect	R. the S.T all-pass
Motor		Connect	The pump running
				General relay (R2) 34	Coil 341	Connect
General relay (R2) 34	B contact 342	Turn-off
				Time-limit relay (TRb) 32	Coil 321	Turn-off	Be failure to actuate

And it is normal if aspirate pump 1 suction side before time-limit relay (TRa) 31 timing are not finished, extrude under the situation of end pressurising, pressure switch contact (Ps) 36 is connected, after timing is finished, 313 open circuits of b contact in limited time of time-limit relay (TRa) 31 change by a contact 312 connections in limited time, power supply continues to be defeated by the coil 341 of solenoid winding 38 and relay (R2) 34 via a contact 312 of prescribing a time limit, pump 1 is remained in operation, after the full water level of downstream, till water level switch contact (Ls) 35 open circuit power supplies are cut off.Its action is as shown in the table:

The element title	The contact title	Action	Remarks
				Water level switch contact (Ls) 35	The a contact	Connect
Time-limit relay (TRa) 31	Coil 311	Connect
				Time-limit relay (TRa) 31	B contact 313 in limited time	Turn-off	After timing is finished
Time-limit relay (TRa) 31	A contact 312 in limited time	Connect
				Magnetic switch (MC)	Coil 38	Connect
Magnetic switch (MC)	The contactor contact	Connect
				Motor		Connect	Pump remains in operation
General relay (R2) 34	Coil 314	Connect
				General relay (R2) 34	B contact 342	Turn-off
Time-limit relay (TRb) 32	Coil 321	Turn-off
				Pressure switch contact (Ps) 36	The a contact	Connect

If cut off the water supply in (time-limit relay 31 timing finish after) suction side in pump 1 running, pump promptly becomes idle running, then pressure switch 2 is because of losing hydraulic pressure, pressure switch contact 36 is opened a way immediately, solenoid winding 38 outages, magnetic switch contactor contact open circuit, the motor interruption of power supply, pump 1 shuts down, and the coil 341 of isochrone electrical equipment 34 also cuts off the power supply, and the b contact 342 of relay 34 is connected, so time-limit relay 32 coils 321 energisings, the b contact in limited time 323 of time-limit relay 32 is connected simultaneously, and (L) is bright for beacon, and pick up counting (time can be set at the 5-30 branch).Its action is as follows:

The element title	The contact title	Action	Remarks
				Water level switch contact (Ls) 35	The a point	Connect
Time-limit relay (TRa) 31	Coil 311	Connect
				Time-limit relay (TRa) 31	Contact 313 in limited time	Turn-off	After timing is finished
Time-limit relay (TRa) 31	Contact 312 in limited time	Connect
				Magnetic switch (MC)	Coil 38	Turn-off
Magnetic switch (MC)	Contactor connects	Turn-off
				Motor		Turn-off	Pump shuts down
General relay (R2) 34	Coil 341	Turn-off
				General relay (R2) 34	Contact 342	Connect
Relay in limited time	Coil	321	Connect

Device (TRb) 32
			Time-limit relay (TRb) 32	B contact in limited time	Connect	(wait timing) picks up counting
Beacon (L)	Connect	It is undesired that expression is supplied water
			Pressure switch contact (Ps) 36	The a contact	Turn-off

When timing is finished, the a contact in limited time 322 of time-limit relay 32 is connected, 331 energisings of relay 33 coils, make its contact 322 open circuits, so time-limit relay 31 coils 311 outages, under the 312 open circuit outages of a contact in limited time of time-limit relay 31, relay 33 coils 331 but energising just become outage again, the b contact 332 of relay 33 is connected again, therefore time-limit relay 31 coils 331 are switched on again, and the b contact in limited time 313 of time-limit relay 31 is connected and picked up counting, solenoid winding 38 energisings simultaneously, contactor draws a little logical make motor starting, pump 1 entry into service again.Its operation is as shown in the table:

The element title	The contact title	Action	Remarks
				Water level switch contact (Ls) 35	The a contact	Connect
Time-limit relay (TRb) 32	Coil 321	Connection → shutoff
				Time-limit relay (TRb) 32	B contact 323 in limited time	Turn-off	Beacon extinguishes
Time-limit relay (TRb) 32	A contact 322 in limited time	Connection → shutoff
				Time-limit relay (TRa) 31	Coil 311	Shutoff → connection
Time-limit relay (TRa) 31	A contact 312 in limited time	Connection → shutoff

Time-limit relay (TRa) 31	B contact 313 in limited time	Shutoff → connection
			General relay (R2) 34	Coil 341	→ connect and turn-off	Reset and begin thus
General relay (R2) 34	B contact 342	Shutoff → connection
			Motor		Shutoff → connection
Pressure switch contact (Ps) 36	The a contact	Turn-off
			Magnetic switch (MC)	Coil 38	Shutoff → connection
Magnetic switch (MC)	The contactor contact	Shutoff → connection

After timing is finished, reply normal as yet as if pump suction side water supply condition, then pressure switch contact 36 still can't be connected, pump will temporarily be shut down again, time-limit relay 32 continues reclocking ... so regularly repetitiousness detecting, by the time pump suction side water supply condition normally just continues pumping, and full water level stops again again until the downstream.Therefore via the enforcement of the utility model, the effect that it can be obtained, in respect of following several:

One. can detect the pump idling conditions, even the pump of existing side by side stops to remain in operation.

Two. supplying water when interrupting in the pump suction side, can cut off the electricity supply automatic primer pump when recovering when supplying water immediately automatically.

Three. prevent because of the long-time infringement of dallying and being caused of pump.

Four. can regularly play reason idle running and the pump of time-out and test the water supply condition of its suction side.

Five. be suitable for the pump of any bore.

Six. easily also be suitable for the pumping system of both having used by dressing, needn't revise pipe arrangement.

Claims

1, a kind of detection device of pump idle running, it comprises:

One pump is well known device, tool suction and force feed function, and be communicated with intake pipe and outlet pipe;

One pressure switch also is a well known device, and interior tool current switch contact is located at a pump irrigating gate, junction closure during pressurized and connecting, and contact open circuit when pressing and obstructed relaxes;

One combined control circuit, by two energising delayed type time-limit relays, two general relays and pressure switch contact link mutually;

It is characterized in that extruding the switching of the pressure size contact that causes of end by the pressure switch bearing pump, so through the work of control circuit with the starting of operating pumps, detect or shut down.

2, the detection device of pump idle running according to claim 1 is characterized in that time-limit relay wherein carries out presetting of time.