CN2869956Y

CN2869956Y - Liquid-level relay

Info

Publication number: CN2869956Y
Application number: CN 200520128679
Authority: CN
Inventors: 叶相灿
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-08
Filing date: 2005-10-08
Publication date: 2007-02-14
Anticipated expiration: 2015-10-08

Abstract

Liquid level relay is an automatic control device for liquid level, which comprises of transformer, wire, circuit board, rectifying bridge stack, filter capacitor, voltage regulating IC, relay, diode, six-negative gate IC, LED, resistor and detection pole by connection. The transformer is connected with the circuit board by wire, and on the circuit board, rectifying bridge stack, filter capacitor, voltage regulating IC, relay, diode, six-negative gate IC, LED, resistor and detection pole are connected in sequence.

Description

Liquid level relay

One, technical field: the utility model relates to a kind of automatic control of liquid device, especially liquid level relay

Two, background technology: for a long time, automatic water supply and sewage, though method is a lot, that often uses has two kinds: the one, water float, the 2nd, integrated protection self-actuated controller.The water float is affected by environment; be prone to corrosion fault and installation and maintenance inconvenience up and down; Chinese patent ZL97244937.X}{ZL patent No. 01207074.2} discloses a kind of water collecting pump motor, and overload of loss of phase, water supply and sewage is in the comprehensive control protector of one automatically.This series products is easy for installation, highly sensitive, stable performance, be highly commended by customers deeply, but its weak point is arranged.The one, function is too concentrated, and any breaks down and easily causes complete machine to stop using; The 2nd,, inconvenient maintenance, because of with high content of technology, parts be difficult for to be bought, common electrical maintenance not, often return-to-factory, or wait for after producer send professional's reparation and could use; The 3rd, the price height, this quasi-controller price is in 220-280 unit, annex such as housing box, contactor outside mixing, the finished product valency is in 450-800 unit.Therefore, can not large tracts of land promote, have only minority enterprise using.The appearance of 714 liquid level relays in recent years,, market price low because of its price be in 20-25 unit, and volume is little, in light weight, be again that connector is installed, can also be supporting with the power distribution cabinet case.Installation and maintenance are convenient, need not wait for the professional, and common electrician can solve, and perhaps user oneself buys relay and plugs and get final product to market.So China has a lot of producers all producing, but this product exists the defective of unstable properties, is used on micro pump or the large-scale self coupling reduced-voltage starting water pump, still can use half a year to one year.Be used on the water pump of medium and small direct startup, the operating period is seldom fail-safed above three months, just can not work in several days that have, even related contactor, the water pump burnt, bring unnecessary loss to the user.Therefore, allow users hope and draw back, I once deeply hurt, also once seeked advice to producer, all do not obtain satisfied answer, have to do it yourself by phone, dealer, through long-term parsing, comparison, unstable properties, short, easy to failure problem of life-span are found in experiment finally, appear on the power circuit, and big electric current causes during by spread of voltage and starting mode of pump.At present 714 liquid level relays of each manufacturer production adopt secondary 15V or 14V alternating current, become the powered by direct current of 12V by bridge heap, filter capacitor, voltage stabilizing diode in power circuit, exchanging with 27V of also having becomes 24V direct current supply, but effect all is the variation with power supply changes deficient in stability.For example: elementary 220V becomes 15V for the 12V DC relay.If use electric welding machine welding rod and ground wire short circuit several seconds, liquid level relay just can be malfunctioning, shake or directly do not work, simultaneously, measuring voltage elementary 150V level 10V, direct current 7V can draw thus, and the low pick-up voltage that does not satisfy the 12V DC relay of voltage causes unsettled conclusion just.

Three, summary of the invention: the purpose of this utility model provides that a kind of price is low, volume is little, in light weight, highly sensitive, safe and reliable, installation and liquid level relay easy to maintenance, malfunctioning when emphasis solution voltage is low, easily produce the related technical matters of burning contactor, water pump of shake instability during the water pump starting under load.The purpose of this utility model is to realize like this, it is to be formed by connecting by transformer, electric wire, wiring board, rectifier bridge heap, filter capacitor, integrated regulator, relay, diode, six ungated integrated circuits, light emitting diode, resistance, the detection utmost point, transformer is connected with wiring board by electric wire, the rectifier bridge heap that is being linked in sequence in the circuit board, filter capacitor, integrated regulator, relay, diode, six ungated integrated circuits, light emitting diode, resistance, the detection utmost point.

Power circuit is all spendable alternating voltage of 17-35V by alternating current 220V or 380V voltage, through the T step-down, by entering the integrated potential circuit IC of three ends model 7812 after UR rectification and the C filtering, for Level Detection control display circuit provides reliable and stable 12V DC voltage; Electrode a is a public electrode, and ground-electrode, electrode b are low water level electrode, and electrode c is a high water level electrode.When water level is higher than electrode b in the pond, D6 is that low level is output as high level because of input end, the D5 output low level, VL sends its inner green emitting diode of green light and lights, and D1-D4 all exports high level, not adhesive of relay K, its normally closed interlock K2 connects, normally open contact K1 disconnects, not adhesive of A.C. contactor KM, and pump motor M does not work.When water level in the pond is reduced to electrode b when following, the D6 output low level, D5 exports high level, the equal output low level of D1-D4, VL sends red light, its inner emitting red light diode is lighted, the adhesive of K energising simultaneously, and its normally closed interlock disconnects, normally open contact is connected, the KM adhesive, its normally open contact is connected, and makes M energising work.Water pump begins to draw water in the pond, and when water level in the pond rose to electrode c, D6 and D1-D4 exported high level again, and K and KM discharge, and M quits work.Reduce to electrode c when following when water level, because the K2 contact is connected, D6 still exports high level, and M does not still work, and only reduces to electrode b when following at water level, and M could energising work, so goes round and begins again, and makes that water level maintains between electrode b and the electrode c in the pond.

The utility model is because the method that has adopted the rising secondary voltage in power circuit, set up integrated stable voltage circuit, so compared with prior art, the serviceable life of product, stability, reliability are greatly improved, and the cost price of the integrated regulator that increases newly is about 0.6 yuan; Prolonged the control line distance than original technology.

Four, description of drawings: Fig. 1 is the structural representation of liquid level relay, among the figure 1, transformer 2, rectifier bridge heap 3, filter capacitor 4, integrated regulator 5, relay 6, diode 7, six ungated integrated circuits 8, light emitting diode 9, resistance 10, detect the utmost point

Five, embodiment: in Fig. 1, transformer 1 is connected with wiring board by electric wire, the rectifier bridge that is being linked in sequence in the circuit board heap 2, filter capacitor 3, integrated regulator 4, relay 5, diode 6, six ungated integrated circuits 7, light emitting diode 8, resistance 9, the detection utmost point 10.

Claims

1, liquid level relay, it is by transformer (1), electric wire, wiring board, rectifier bridge heap (2), filter capacitor (3), integrated regulator (4), relay (5), diode (6), six ungated integrated circuits (7), light emitting diode (8), resistance (9), detecting the utmost point (10) is formed by connecting, it is characterized in that: transformer (1) is connected with wiring board by electric wire, the rectifier bridge that is being linked in sequence in the circuit board heap (2), filter capacitor (3), integrated regulator (4), relay (5), diode (6), six ungated integrated circuits (7), light emitting diode (8), resistance (9), detect the utmost point (10).