CN2108282U

CN2108282U - Float-type liquid level sensor

Info

Publication number: CN2108282U
Application number: CN 91232693
Authority: CN
Inventors: 徐福安; 李岳鹏; 沈脐
Original assignee: TENGDA CONSTRUCTION INSTALLATION ENGINEERING Co
Current assignee: TENGDA CONSTRUCTION INSTALLATION ENGINEERING Co
Priority date: 1991-12-26
Filing date: 1991-12-26
Publication date: 1992-06-24

Abstract

The utility model relates to a float-type liquid level sensor which belongs to the improvement to the mercury contact float-type liquid level sensor. The utility model comprises a floating barrel, a float and a switch box. The inner of the float is provided with a magnet, and the inner of the switch box is provided with magnetic-sensing switch elements which are arranged successively. The sensor has the advantages of small size, simple structure and reliable work.

Description

Float-type liquid level sensor

The utility model belongs to the automatic control of liquid technical field, relates to a kind of liquid level sensor, particularly the improvement of boiler liquid level sensor.

Accompanying drawing 1 provides a kind of known float-type liquid level sensor (selecting from " boiler design handbook " the 1010th page), and it is made up of floating drum (1), float (2), regulating box parts such as (4).Regulating box (4) is communicated with floating drum (1) inner chamber, and mercury cut-off (6) is arranged in the case.The upper and lower of floating drum is communicated with the air space and the hydrospace of boiler respectively.Float (2) is a hollow ball, is contained in the floating drum (1) to fluctuate with water level, and float (2) upper end is fixed a connecting rod (3) support magnet (5) and stretched in the regulating box (4).Magnet (5) makes switch motion when the mercury cut-off (6), connects circuit (or disconnecting circuit), provides water level signal.The major defect of this sensor is:

1. volume is big.The volume of mercury cut-off is just big, adds that it needs bigger magnetic force just to move, and makes the corresponding increase of magnet and float volume, so the big heaviness of whole sensor body.

2. complex structure is installed and is adjusted difficulty.Because regulating box and floating drum form closed inner chamber, position, the angle of therefore adjusting mercury contact wherein are all very difficult.

3. magnet is supported on the float by long connecting rod, and connecting rod is long more, and motion artifacts is big more, functional reliability is low more, so the float heave amplitude is limited, makes the number of mercury cut-off can only be limited in seldom quantity, the water level signal that provides is few, and measurable range of stage is little.

The purpose of this utility model provide a kind of simple in structure, volume is little, easy to adjust, measurement range big, the novel liquid level sensor of reliable operation.

The utility model comprises that a floating drum (7) that has communicating pipe (8), one are positioned at floating drum (7) can be with the float (9) and a magnet (10) of liquid surface lifting, it is characterized in that, float (9) is a length-diameter ratio greater than 1 hollow sealing rotary body, magnet (10) is sealed be installed in the float (9) by under the position;

Fix

2 or 2 above magnetosensitive on-off elements (14) at a certain distance in the outside of floating drum (7), for example magnetodiode, tongue tube, wet reed pipe etc. all can.Because these component sizes are very little, therefore can arrange abundant on-off element along the liquid level change direction on request, accurate liquid level change signal is provided.Can be bonded at the floating drum outer wall to on-off element with simple method, when the float lifting made magnet near certain switch, this switch was promptly connected (or disconnection), provides liquid level signal.

The utility model has the advantages that:

1. simple in structure.Compared with the prior art, the utility model has been cancelled regulating box (4) and connecting rod (3), replaces the mechanical type mercury cut-off with magneto sensor, and structure is simplified greatly.

2. volume is little, measurement range is big.Float is not with connecting rod, elevating movement freely, measurement range increases considerably, measuring accuracy also increases with the quantity of on-off element and improves.

3. easy to adjust.As long as adjust the position of floating drum external switch element.

Accompanying drawing 1 is the prior art synoptic diagram.Accompanying drawing 2 is structural representations of a kind of embodiment of the utility model.Scheme of installation when accompanying drawing 3 is mounted in heating boiler.Further specify CONSTRUCTED SPECIFICATION of the present utility model below in conjunction with accompanying drawing.

Referring to Fig. 2.For ease of producing and using, magnetosensitive on-off element (14) is installed on the circuit board that is arranged in switch enclosure (12), switch enclosure (12) is fixed on the outer suitable position of floating drum (7) by two clips (11) and screw (16), by the plug connector (13) that is fixed on the switch enclosure (12) wiring of each magnetosensitive on-off element (14) is drawn.This structure is brought the facility in the adjustment, unscrews the position that screw (16) can be adjusted switch enclosure (12); Can also change switch enclosure easily, the change measuring accuracy with varying number on-off element.

Float (9) is hollow rotary body, right cylinder for example, and its length diameter ratio generally between 1.5～6, is made of resistant material.Magnet (10) is permanent-magnet steel, can it be bonded in the float again with float seal earlier.

Used magnetosensitive on-off element (14) is recommended to use tongue tube or wet reed pipe, and volume is little, reliable in action, and cost is low.

When liquid level change was violent, the motion amplitude of float may be very big, to the impact of floating drum bottom, is provided with buffer spring (15) when preventing that its from descending, and is installed in the floating drum inner bottom part.

The utility model in use, communicating pipe (8) links to each other with reservoir vessel, floating drum (7) top links to each other with liquid level superjacent air space in the liquid storage container.(see accompanying drawing 3) when for example using on heating boiler, communicating pipe (8) is communicated with the boiler water space, and floating drum (7) top with equalized pressure, maintains an equal level interior water level of floating drum and water level in the boiler by being communicated with boiler air space (18) communicating pipe (17).Deliver to control circuit by the water level signal that plug connector (13) is drawn, control each topworks's work.

Claims

1, a kind of float-type liquid level sensor, comprising that a floating drum (7) that has communicating pipe (8), one are positioned at floating drum (7) can be with the float (9) and a magnet (10) of liquid surface lifting, it is characterized in that, float (9) is a length-diameter ratio greater than 1 hollow sealing rotary body, magnet (10) is sealed be installed in the float (9) by under the position; Fix 2 or 2 above magnetosensitive on-off elements (14) at a certain distance in the outside of floating drum (7).

2, liquid level sensor according to claim 1, it is characterized in that, said magnetosensitive on-off element (14) is installed on the circuit board that is arranged in switch enclosure (12), switch enclosure (12) is fixed on the outer suitable position of floating drum (7) by two clips (11) and screw (16), and plug connector (13) is drawn the wiring of each magnetosensitive on-off element (14).

3, liquid level sensor according to claim 1 and 2 is characterized in that, said magnetosensitive on-off element (14) is tongue tube or wet reed pipe.