Transmitter

 

(57) Abstract:

Usage: the invention is used for level measurement of liquids in closed containers. The essence of the invention: transmitter containing a tubular rod, a float, a permanent magnet and an electrical circuit including the switch, at the ends of the rod set, rollers connected with a flexible coupling, the bottom roller is connected to the float with mixed center of mass about an axis of rotation, and the upper roller is associated with a pointer with a fixed permanent magnet, the reed switch is fixed at the top of the rod with the opportunity to interact with the magnet. 1 C.p. f-crystals, 1 Il.

The invention relates to the field level measurement of liquids in closed containers.

Known sensor for measuring the level of gasoline in closed containers at a refuelling point (1), made in the form of a tubular rod with put to it by the dictates inserted into the pipe gage hatch, and level indicator. The level of gasoline is determined by the boundary of the wetted part of the bar.

The main disadvantage of this sensor is the inaccuracy of measuring the level, because it is difficult to visually define the boundary between the wetted and dry part of the rod.

Know what the form of a tubular rod), inside of which is placed a float gauge, a permanent magnet, the reed switch associated with a light indicator, a source of power.

The main disadvantage of this device is that you cannot use it for liquid level measurement in tanks containing flammable vapors combustible materials (e.g. gasoline) due to the presence of conductive circuits located inside containers, as well as the complexity of the design.

The technical result of the invention the expansion of technological capabilities, improve fire safety and simplifying the design.

This result is achieved in that in the transmitter containing a tubular rod with a scale, the float is placed inside the rod, a permanent magnet and an electrical circuit including a power source, an electric light bulb and the switch, put the upper and lower rollers are covered with a flexible coupling, the indicator rod attached to the axis of the upper roller at the top of the rod, the float is installed freely in a balanced position at the bottom of the rod and connected with the lower roller, the axis of which is offset from the center of mass of the float in a position in which the vertical plane, prohodymosty magnet fixed on the index rod, the reed switch is installed along the axis of the rod with the ability to interact with a permanent magnet in the horizontal position of the float, and an electrical circuit mounted on the upper part of the rod; the float is made in the form of a cylinder with a shank.

The drawing shows a General view of the sensor at the moment of contact of float fluid. The dashed line indicates the position of the sensor horizontal float position corresponding to the time for reading on the scale level of a liquid in a closed container.

This marked:

And the direction to move the rod inside the tank;

B and In the direction of rotation, respectively, of the index rod with a magnet and float;

And the distance from the measuring base of the guide sleeve of the tank to the axis of the float is in its horizontal position:

E the distance from the bottom of the tank to the end of the sleeve;

K is a constant for the sensor is equal to the distance from the liquid level to the axis of the float is in its horizontal position. This value characterizes the degree of buoyancy of the float in the fluid and is equal to the height of the unflooded part of the float below the axis of the float;

e the amount of the axis displacement of the float from the center of mass is the location of the float, because in this position more clearly reveals the nature of the displacement axis, float);

X read the size of the liquid level (in the horizontal position of the float).

The sensor consists of a tubular rod 1 with a scale that is inserted into the hole of the sleeve 2, which is fixed on the neck of a vessel 3, the float 4 with roller 5 mounted on the axis at the bottom of the rod 1, the upper roller 6 with indicator rod 7 mounted on an axis in the upper part of the rod 1, and a flexible connection 8, covering the rollers 5 and 6. At the top of the rod 1 on the bracket 9 is mounted an electric signal device consisting of a battery (batteries) 10, light bulbs 11 and sealed contact (reed switch) 12. At the end of the index rod 7 is fixed a permanent magnet 13 with the possibility of its interaction with reed contact 12 when rotating along arrow B in an upright position. The electrical circuit is enclosed in a casing 14. The float 4 is made in the form of a cylinder with the shank 15. When the float 4 is freely balanced condition, and the axis of the roller 5 are offset from the center of mass of the float in a position in which the vertical plane passing through the axis of the roller, is located towards the rear of the center of mass puplinge 1 thus, so when the horizontal position of the float 4 index rod 7 with the magnet 13 were placed in sealed contact 12 in the area of providing actuation (closure of the contacts of the reed switch.

The operation of the transmitter is as follows: when lowering the bar 1 down arrow And through the guide sleeve 2, the float 4 is freely balanced downward position due to the displacement of the axis of rotation (the value of e 1 3 mm). Since touch float liquid he begins to gently rotated along arrow B, transmitting the rotation of the arrow B to the roller 6 with the index rod 7. Upon further lowering of the rod 1, the operator monitors the movement of the index rod 7. When the float will be in the horizontal position (the position sensor is shown in dashed lines), a permanent magnet 13 will close the contacts of the reed switch 12 and light bulb 11. At this point, the operator reads the size of the scale bar. The scale on the rod is positioned so that when opiranii the lower end of the rod in the bottom of the tank zero of the scale was located in the plane of the measuring end of the sleeve 2. In this case, the read size X on the scale will be equal to the difference between the distance E from the bottom of the tank to the upper end of the sleeve and the size is of ASCII satisfies the control of the liquid level from the end of the sleeve 2, in this case, the zero of the scale is located on the underside of the bar.

The use of this sensor increases fireproof conditions for measuring liquid levels in tanks containing pairs legkonastraivaemy liquids, and thereby expanding the technological capabilities to use the device. In addition, the proposed sensor is simple in construction and easily adjustable by prescriptie (rotation) of the index rod relative to the upper roller.

1. The sensor containing the tubular rod with scale, the float is placed inside the rod, a permanent magnet and an electrical circuit including a power source, an electric light bulb and the switch, characterized in that it introduced the upper and lower rollers are covered with a flexible coupling, the indicator rod attached to the axis of the upper roller at the top of the rod, the float is installed freely in a balanced position at the bottom of the rod and connected with the lower roller, the axis of which is offset from the center of mass of the float in a position in which the vertical plane passing through the axis of the lower roller, located behind the center of mass of the float relative to the direction of rotation, the permanent magnet scrm magnet in the horizontal position of the float, and an electrical circuit mounted on the bar top.

2. The sensor under item 1, characterized in that the float is made in the form of a cylinder with the shank.

 

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