CN2677890Y

CN2677890Y - Level sensor

Info

Publication number: CN2677890Y
Application number: CN 200420024917
Authority: CN
Inventors: 许秀煌
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-24
Filing date: 2004-02-24
Publication date: 2005-02-09
Anticipated expiration: 2014-02-24

Abstract

The utility model discloses a liquid level sensor comprising an inner tube (1), an outer tube (2), leader lines (A), (B), and a sealing element (4). The liquid level sensor is characterized in that the liquid level sensor also comprises a unit of magnetic switches (S), spacer pins (13), a resistance element (R), magnetic buoyages (3) and an exclusive use reflux connector (6). Both ends of the inner tube (1) and the outer tube (2) are sealed to form a seal cavity (5) by the sealing element (4). The seal cavity (5) in which the magnetic switches (S) and the resistance element (R) are arranged is connected with the leader lines (A), (B). A unit of spacer pins (13) are arranged in the inner tube (1). A unit of magnetic buoyages (3) are arranged between the spacer pins (13). One end of the exclusive use reflux connector (6) is connected with the inner tube (1) and the other end is connected with a container (V). The liquid level sensor can be arranged not only in a container but also outside the container. The liquid level sensor can not be affected by temperature and pressure in the container and the service life is long. The liquid level sensor can stably and reliably indicate the variance of the liquid level of the liquid in the container. The liquid level sensor can ensure that solar energy water heaters, water towers or other containers filled with liquid are normally used.

Description

Liquid level sensor

Technical field

The utility model relates to a kind of measurement, control and display device that is used for liquid level, liquid level control, measurement and the display device of more specifically saying so and being used for solar water heater water tank, water tower, liquid filling container.

Background technology

At present both at home and abroad open and actual use be used for solar water heater water tank, water tower, the liquid level control and the display device of liquid filling container, the electric probe that its sensor adopts metal material to make mostly, utilize the electric conductivity of liquid to record the high-low signal of liquid level, utilize the electric conductivity of conducting liquid to change this signal into electric signal, control and show above-mentioned water tank for controller and display device, water tower, the liquid level change situation of container, control is advanced or the solenoid valve or the pump of fluid, above-mentioned metal probe utilizes the electric conductivity of water or conducting liquid, convert the liquid level variable signal to electric signal, come control electromagnetic valve or contactor to close or open liquid-transport pipe-line for control and display device, but the sensor uses for a long time, particularly under the fluid temperature condition with higher, the electric probe long period of soaking of being made by conductive metallic material is in liquid, not only can be at its electric probe surface deposition trowel used for plastering dirt, and owing to electric probe has been led to, the slow electrolysis of meeting in conducting liquid, make the probe corrosion, cause signal errors even malfunctioning, give solar water heater, water tower, the container of carrying liquid brings labile factor, it can not stop when this stopped feed flow, making liquid exceed said vesse spills into the outside and causes waste, it down can feed flow in the time of should feed flow, and therefore this device is difficult for promoting.

Summary of the invention

The technical matters that the utility model mainly solves provides a kind of liquid level sensor, it not only can be installed in the container and also can be installed in outside the container, the not influence of temperature and pressure in the receptor, long service life, and can reliablely and stablely indicate the variation of liquid in container liquid level, thereby guarantee the normal use of solar water heater, water tower and other liquid filling container.

The utility model is to solve the problems of the technologies described above to realize by following technical proposal, above-mentioned liquid level sensor comprises interior pipe, outer tube, the magnetic float, magnetic switch, resistive element, spacer pin, seal, extension line, special-purpose backflow connector, pipe places in the above-mentioned outer tube in above-mentioned, pipe forms annular seal space with the outer tube two ends with the seal sealing in above-mentioned, above-mentioned annular seal space is built-in with magnetic switch, resistive element also links to each other with extension line, pipe is built-in with one group of spacer pin in above-mentioned, between above-mentioned spacer pin, be equipped with one group of magnetic float, above-mentioned special-purpose backflow connector one end links to each other with interior pipe, and the other end links to each other with container.

Above-mentioned magnetic float comprises housing, permanent magnet, sealing buoyancy cavity, anti-absorption ring, magnet chamber, and above-mentioned permanent magnet places in the magnet chamber, and above-mentioned anti-absorption is located on the housing, and the magnetic float is fluctuated with liquid level change in pipeline reliably.

Above-mentioned special-purpose backflow connector comprises pipe, seal in branch pipe tee connection, the liquid in-out, the external diameter of pipe is less than the former reservation internal diameter of the pipeline of container in the liquid in-out of special-purpose backflow connector, pipe and container V reserve and form a return flow line between the pipeline in liquid in-out, pipe places in the branch pipe tee connection in the liquid in-out of special-purpose backflow connector, sealed by seal between Guan Yiduan and the branch pipe tee connection in the liquid in-out, the other end of pipe inserts in the container reservation pipeline in the liquid in-out

The utility model liquid level sensor has following advantage: in the cavity in the magnetic switch of this sensor, resistive element, pinout connector all are sealed between pipe and the outer tube, do not contact with the liquid in the container, therefore can be on the liquid level sensor contact incrustation or slow electrolysis takes place, so this liquid level sensor long service life; This liquid level sensor can be reflected in resistance value that correspondingly changes on the extension line according to the variation of liquid in container liquid level, for control and display device a reliable electric signal is provided, because what this sensor adopted is the magnetic strength effect, be not subjected to controlled liquid whether to have the influence of electric conductivity, it can not be subjected to electric spark, the factor that influence such as static is used, and it can be installed in, and container is outer also can to connect into an integral body with container, the not influence of fluid temperature and pressure in the receptor is so it is a kind of safety of various working fluid reservoir vessels, reliable liquid level sensor.

Above-mentioned magnetic float adopts when the buoyancy of magnetic float liquid body is floated when the control magnetic switch, and magnetic switch loses magnetic force and opens the contact, has avoided magnetic switch to be subjected to the effect in magnetic field for a long time and magnetization phenomenon takes place like this.

Description of drawings

Fig. 1 is the circuit theory diagrams of liquid level sensor of the present utility model;

Fig. 2 is the structural representation of liquid level sensor of the present utility model;

Fig. 3 is the magnetic Floater Structure synoptic diagram of liquid level sensor of the present utility model;

Fig. 4 is a liquid level sensor scheme of installation of the present utility model;

Fig. 5 is another scheme of installation of liquid level sensor of the present utility model;

Embodiment

Fig. 1 comprises the interior pipe 1 of up/down perforation to liquid level sensor shown in Figure 5; outer tube 2; pipe 1 places in the above-mentioned outer tube 2 in above-mentioned; pipe 1 is equipped with seal 4 with above-mentioned outer tube 2 two ends in above-mentioned; between interior pipe 1 and outer tube 2, form a sealed cavity 5; one group of magnetic switch S is installed in sealed cavity 5; resistive element R; the two ends extension line is A; B; 2 sealings of above-mentioned outer tube and protective effect; on the tube wall of pipe 1 the one group of spacer pin 13 that is used to control and show the liquid level height is installed in above-mentioned; spacer pin 13 can stop magnetic float 3 to drift about and landing; the one group of magnetic float 3 that is used to control magnetic switch S is installed between spacer pin 13; above-mentioned magnetic float 3 comprises housing 31; permanent magnet 32; sealing buoyancy cavity 33; anti-absorption ring 34; magnet chamber 35; permanent magnet 32 places in the magnet chamber 35; above-mentioned anti-absorption ring 34 is placed on the housing 31; pipe 2 is connected with special-purpose backflow connector 6 one ends in above-mentioned; special-purpose backflow connector 6 other ends link to each other with container V; special-purpose backflow connector 6 comprises branch pipe tee connection 61; pipe 62 in the liquid in-out; seal 63; the external diameter of pipe 62 is less than the internal diameter of the former reservation pipeline 7 of container V in the liquid in-out of special-purpose backflow connector 6; pipe 62 and container V reserve and form a return flow line 64 between the pipeline 7 in liquid in-out; pipe 62 places in the branch pipe tee connection 61 in the liquid in-out of special-purpose backflow connector 6; seal by seal 63 between pipe 62 1 ends and the branch pipe tee connection 61 in the liquid in-out; the other end of pipe 62 inserts in the container V reservation pipeline 7 in the liquid in-out; interface that branch pipe tee connection 61 makes progress with above-mentioned in pipe 1 be connected; liquid level sensor should vertically be installed; this moment is when having liquid in the container V; liquid will flow by the return flow line 64 that pipe 62 and container V in the liquid in-out reserve between the pipeline 7, and the liquid level in guaranteeing in the pipe 1 is consistent with the liquid level in the container V.

Above-mentioned magnetic switch S1, S2, S3 are connected with resistive element R1, R2, R3 respectively, along with opening or closing of magnetic switch S1, S2, S3, present a resistance value that just changes with liquid level and change on extension line A, B.

According to by the environment of observing and controlling liquid, the needs of character, liquid level sensor can be installed in the following way, too high and container V is the single tube liquid in-out as fluid temperature in the container V, as solar water heater, water tank etc., can adopt mounting means as Fig. 4, special-purpose backflow connector 6 is installed on the outer side-lower liquid in-out pipeline of container V, special-purpose backflow connector 6 comprises branch pipe tee connection 61, pipe 62 in the liquid in-out, seal 63, the external diameter of pipe 62 is less than the internal diameter of the former reservation pipeline 7 of container V in the liquid in-out of special-purpose backflow connector 6, pipe 62 and container V reserve and form a return flow line 64 between the pipeline 7 in liquid in-out, pipe 62 places in the branch pipe tee connection 61 in the liquid in-out of special-purpose backflow connector 6, seal by seal 63 between pipe 62 1 ends and the branch pipe tee connection 61 in the liquid in-out, the other end of pipe 62 inserts in the container V reservation pipeline 7 in the liquid in-out, interface that branch pipe tee connection 61 makes progress with above-mentioned in pipe 1 be connected, liquid level sensor should vertically be installed, this moment is when having liquid in the container V, liquid will flow by the return flow line 64 that pipe 62 and container V in the liquid in-out reserve between the pipeline 7, and the liquid level in guaranteeing in the pipe 1 is consistent with the liquid level in the container V.

If container V be sealing or institute's liquid storage body be volatile, can adopt the mounting means of Fig. 5, interior pipe 1 all is communicated with container V inner chamber up and down, makes interior liquid level, pressure of managing in 1 interior consistent with container V.

As the liquid in the container V is conventional liq, and as water etc., and the liquid degree can be suspended on the liquid level liquid level sensor among the container V for nature normal temperature.

Liquid level sensor is vertically mounted on as on Fig. 4, the container V shown in Figure 5, no liquid in container V, magnetic float 3-1,3-2,3-3 be not because of being subjected to the effect of liquid buoyancy, so all stay the bottom of chamber, magnetic switch S1, S2, S3 are subjected to magnetic force control, the whole adhesives in contact, resistive element R1, R2, R3 and R0 all are connected in parallel in the circuit, and the resistance value that extension line A, B end presents is for minimum; When liquid injecting container V, magnetic float 3-1 at first is subjected to the liquid buoyancy effect and upwards floats with the liquid level rising, magnetic switch 3-1 loses magnetic force control, the contact disconnects, this moment, circuit lost the R1 parallel connection, resistance value increases, liquid rises gradually in the container V, the limited pin 13 of magnetic float 3-1 blocks no longer come-up, and the resistance value on the circuit remains unchanged, and upwards floats when magnetic float 3-2 is subjected to buoyancy, magnetic switch S2 loses magnetic force control contact and disconnects, circuit loses R1, the R2 parallel connection is presented on A, the corresponding increase of B end resistance value, liquid level continues to rise, 3-2 is blocked by spacer pin 23 to float, this moment, values of circuit resistances was constant, and along with liquid level in the container V rises, magnetic float 3-3 is subjected to buoyancy and upwards floats, magnetic switch S3 loses magnetic force control, the contact disconnects, and have R0 resistance value, A in the circuit this moment, the resistance value maximum that the B two ends present.When liquid level descends, magnetic float loss of buoyance one by one descends, magnetic switch is adhesive one by one, resistance in the circuit is in parallel with circuit one by one, the resistance that A, B two ends are presented descends with liquid level and reduces, back and forth just can obtain resistance values that change with liquid level change reliably as a little, provide an electric signal that changes with liquid level change, thereby correctly control and show liquid level among the container V to liquid level control and display device.

Claims

1, it comprises interior pipe (1) a kind of liquid level sensor, outer tube (2), extension line (A), (B), seal (4), it is characterized in that: it also comprises one group of magnetic switch (S), spacer pin (13), resistive element (R), magnetic float (3), special-purpose backflow connector (6), pipe (1) places in the above-mentioned outer tube (2) in above-mentioned, pipe (1) forms annular seal space (5) with outer tube (2) two ends with seal (4) sealing in above-mentioned, above-mentioned annular seal space (5) is built-in with magnetic switch (S), resistive element (R) and with extension line (A), (B) link to each other, pipe (1) is built-in with one group of spacer pin (13) in above-mentioned, between above-mentioned spacer pin (13), be equipped with one group of magnetic float (3), above-mentioned special-purpose backflow connector (6) one ends link to each other with interior pipe (1), and the other end links to each other with container (V).

2, liquid level sensor according to claim 1, it is characterized in that: above-mentioned magnetic float (3) comprises housing (31), permanent magnet (32), sealing buoyancy cavity (33), anti-absorption ring (34), magnet chamber (35), permanent magnet (32) places in the magnet chamber (35), and above-mentioned anti-absorption ring (34) is placed on the housing (31).

3, liquid level sensor according to claim 1 is characterized in that: special-purpose backflow connector (6) comprises pipe (62), seal (63) in branch pipe tee connection (61), the liquid in-out.

4, liquid level sensor according to claim 3, it is characterized in that: the external diameter of pipe (62) forms return flow line (64) between the pipe (62) less than the internal diameter of container (V) reservation pipeline (7) in above-mentioned branch pipe tee connection (61), reservation pipeline (7), the liquid in-out in the liquid in-out of special-purpose backflow connector (6).

5, according to the described liquid level sensor of claim 3, it is characterized in that: its liquid level sensor (2) but vertical hanging in container (V).