CN201307247Y

CN201307247Y - Float switch

Info

Publication number: CN201307247Y
Application number: CNU2008201543359U
Authority: CN
Inventors: 万隽; 陈建峥; 周若媛
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2009-09-09
Anticipated expiration: 2018-10-22

Abstract

The utility model discloses a float switch comprising a signal cable (10), a float casing (20), a proximity switch (30), an hourglass-shaped control device (40) and a prill (50). The signal cable (10) connected with the proximity switch (30) is arranged at the upper part of the float casing (20); the proximity switch (30) and the hourglass-shaped control device (40) are arranged inside the float casing (20); a foam stuffing (21) is arranged inside the float casing (20); the hourglass-shaped control device (40) comprises a back taper-shaped cavity (41), a conical cavity (43) and a pipelike passage (42) for communicating the back taper-shaped cavity (41) and the conical cavity (43); the tail part of the proximity switch (30) is fixed on the float casing (20), and the head thereof is connected with the hourglass-shaped control device (40); and a proximity switch inductive-head (31) on the head of the proximity switch is positioned at the top of the back taper-shaped cavity (41). The float switch has the advantages of simple structure, reliable performance and long service life.

Description

Float switch

Technical field

The utility model relates to a kind of liquid level automatic monitoring device, particularly a kind of float switch that just changes automatic switchover according to liquid level.

Background technology

Be widely used in water treatment, clear water reserviors, waterworks mixing pit, wastewater disposal basin, intake, water supply tank etc. at water power industry, plumbing industry, sewage treatment plant, float switch at present and need the place of monitoring liquid level automatically, height according to liquid level comes gauge tap, reaches the automatic start-stop purpose of control water pump.

Float switch utilizes gravity and law of buoyancy to design, great majority are by the floating spheroid of sealing simple in structure and be arranged in the floating spheroid of sealing microswitch and switch is in the driving mechanism of switching state, and the cable that links to each other with switch in spheroid composition.Sealing floating spheroid material is polypropylene pp or polyvinylchloride, and inside is air.

Fig. 1 is the synoptic diagram of a kind of float switch commonly used, as shown in the figure, float switch comprises cable 1, sealed ball float housing 2, switch contact 3, mercury glass pipe 4 and liquid mercury 5, in use, the top of float switch is that the place of cable 1 is fixed, when liquid level rises, run-off the straight when ball float housing 2 rises, rise in the bottom, liquid mercury 5 flows to switch contact 3 and actuating switch contact 3 because of action of gravity, when liquid level descends, liquid mercury 5 because of action of gravity away from switch contact 3 and cut off switch contact 3.

There is following problem in the float switch that tradition is used:

1) use over a long time after, the sealing floating body phenomenon that seeps water, leaks, makes moist loses floating ability, and easy to the contact short circuit in the ball float housing and effect out of hand.

2) switch contact with the frequent switch of liquid level rise and fall, causes switch contact aging malfunctioning for a long time easily.

3) float switch of tradition use is when the current fluctuation ratio is big, the float switch at water level reference mark is subject to the output of current fluctuation frequent movement influence formation oscillator signal, cause the inaccurate problem of water level control, and carry out too much and unnecessary boiling water pump, relevant action such as cut out the pump wastes energy, and reduces product serviceable life.

Summary of the invention

For addressing the above problem, the utility model provides a kind of float switch, avoids because the blow-by of ball float housing, level fluctuation etc. to the switch Effect on Performance, reach the purpose that increases the service life.

For achieving the above object, float switch of the present utility model comprises signal cable, ball float housing, near switch, hourglass shape control device and prill, described signal cable with link to each other near switch, place the top of ball float housing; Describedly place in the ball float housing, be provided with foam stuffing in the described ball float housing near switch and hourglass shape control device; Described hourglass shape control device comprises back taper chamber, conical cavity and the tubular conduit that is communicated with described back taper chamber and conical cavity; Described afterbody near switch is fixed on the ball float housing, and its head is connected with described hourglass shape control device, its head be positioned at the top in described back taper chamber near the inductive switching head.

Described foam stuffing is the polyethylene filler.

Described ball float housing can be made of by being threaded two parts up and down.

Float switch of the present utility model also comprises pilot lamp, and described pilot lamp is installed in ball float housing top.

Float switch of the present utility model can not take place owing to phenomenons such as seeping water, leak, make moist causes the out of control problem of switch, and when level fluctuation, because the effect of hourglass shape control device time-delay, also can not move continually, be that life of product increases, and energy savings.

Float switch of the present utility model, simple in structure, dependable performance, long service life.

Description of drawings

Fig. 1 is the synoptic diagram of a kind of float switch commonly used;

Fig. 2 is the synoptic diagram of float switch of the present utility model;

Fig. 3 is the synoptic diagram of float switch of the present utility model when liquid level is low;

Fig. 4 is the synoptic diagram of float switch of the present utility model when liquid level is higher.

Embodiment

Fig. 2 is the synoptic diagram of float switch of the present utility model, as shown in the figure, float switch of the present utility model comprises signal cable 10, ball float housing 20, near switch 30, hourglass shape control device 40 and prill 50, described signal cable 10 with link to each other near switch 30, place the top of ball float housing 20; Describedly place in the ball float housing 20, be provided with foam stuffing 21 in the described ball float housing 20 near switch 30 and hourglass shape control device 40; Described hourglass shape control device 40 comprises back taper chamber 41, conical cavity 43 and the tubular conduit 42 that is communicated with described back taper chamber 41 and conical cavity 43; Described afterbody near switch 30 is fixed on the ball float housing 20, and its head is connected with described hourglass shape control device 40, its head be positioned at the top in described back taper chamber 41 near inductive switching head 31.

Signal cable 10 is used for linking to each other with water pump control loop or water level alarm etc.

Ball float housing 20 is formed buoyancy aids with foam stuffing 21, and the profile of ball float housing 20 is an ellipse, has the hollow sphere of smooth surface, hard rigidity, adopts corrosion-resistant, acid resistance, resistant to elevated temperatures polypropylene PP or polyvinylchloride material to make.Foam stuffing 21 can be adopted tygon (PE) foam stuffing, because the air that foam stuffing 21 has replaced in the existing ball float housing 20 produces buoyancy, the characteristics of tygon (PE) foam stuffing itself are almost not have water absorptivity and high foaming and outstanding water proofing property, make it have very strong buoyancy and can't be subjected to various weather influences, there is not sealing problem, just avoided yet, stopped the most common infiltration of float switch of traditional use, the phenomenon of leaking, make moist.

Ball float housing 20 can be made of by being threaded two parts up and down.

Hourglass shape control device 40 is by the length restriction of the angle of back taper chamber 41, conical cavity 43 and tubular conduit 42 and prolongs the rolling time of prill 50 at hourglass shape control device 40 two, i.e. the working time of prill 50 from conical cavity 43 to back taper chamber 41.Back taper chamber 41, tubular conduit 42 and conical cavity 43 are respectively metal detection scope active zone, metal detection range of instability and the non-investigative range of the metal district near switch 30, prill 50 is eliminated the harmful effect that level fluctuation causes a time-delay and an operating stably being arranged from the conical cavity 43 of lower end during to back taper chamber 41.

In addition since most of float switches workplace in the bad pond of light, such as water tank, pump hole, large-scale water treating pond, these places need the people usually and regularly, regularly make an inspection tour the observed stage state, float switch of the present utility model is provided with pilot lamp 11, described pilot lamp 11 is installed in ball float housing 20 tops, pilot lamp 11 not only can also conveniently be maked an inspection tour the state of personnel's observed stage as the indication of float switch duty.

Fig. 3 is the synoptic diagram of float switch of the present utility model when liquid level is low, and Fig. 4 is the synoptic diagram of float switch of the present utility model when liquid level is higher.Float switch of the present utility model in use, the signal cable on its top 10 is fixing by locating piece 12.Do time spent ball float housing 20 run-off the straights when this device is subjected to liquid buoyancy, when hanging down liquid level 100, prill 50 is positioned at conical cavity 43, as shown in Figure 3.And rise with liquid level, the angle of inclination of hourglass shape control device 40 also changes with liquid level, as shown in Figure 4, when reaching higher liquid level 101, the angle of conical cavity 43 can not limit prill 50, prill 50 rolls to back taper chamber 41 by tubular conduit 42, near the inductive head 31 of switch 30 to prill 50 near and signal is opened in output, and through signal cable 10 anhydrate pump control loop or water level alarm etc.This device principle of work is same as described above when liquid level descends, and only prill 50 is rolled to conical cavity 43 by back taper chamber 41, and away near switch 30, makes near switch 30 output shutdown signals.

Claims

1, a kind of float switch, it is characterized in that, comprise signal cable (10), ball float housing (20), near switch (30), hourglass shape control device (40) and prill (50), described signal cable (10) with link to each other near switch (30), place the top of ball float housing (20); Describedly place in the ball float housing (20), be provided with foam stuffing (21) in the described ball float housing (20) near switch (30) and hourglass shape control device (40); Described hourglass shape control device (40) comprises back taper chamber (41), conical cavity (43) and is communicated with described back taper chamber (41) and the tubular conduit (42) of conical cavity (43); Described afterbody near switch (30) is fixed on the ball float housing (20), and its head is connected with described hourglass shape control device (40), its head be positioned at the top in described back taper chamber (41) near inductive switching head (31).

2, float switch as claimed in claim 1 is characterized in that, described foam stuffing (21) is the polyethylene filler.

3, float switch as claimed in claim 1 is characterized in that, described ball float housing (20) can be made of by being threaded two parts up and down.

4, float switch as claimed in claim 1 is characterized in that, also comprises pilot lamp (11), and described pilot lamp (11) is installed in ball float housing (20) top.