CN2658724Y

CN2658724Y - Liquid level sensor

Info

Publication number: CN2658724Y
Application number: CN 03221362
Authority: CN
Inventors: 许秀煌
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-22
Filing date: 2003-04-22
Publication date: 2004-11-24
Anticipated expiration: 2013-04-22

Abstract

The utility model discloses a liquid level sensor which comprises an inner pipe (21), an outer pipe (22), a sealing component (24), a set of positioning pins (23), a set of magnetic control switches (S), a resistance component (R), lead wires (A), (B), and a set of controlling magnetic control switches (S). The magnetic control switches (S), the resistance component (R), the lead wires (A), (B) are all sealed inside a sealing cavity chamber (25) between the inner pipe (21) and the outer pipe (22), and have no touch with the liquid level inside a vessel (V). The magnetic switch (S) is connected with the resistance component (R) and makes a magnetic bobber (3) moving up and down in the inner pipe (21) along with the changes of the liquid level in the vessel (V) and then controls the magnetic control switches (S). A resistance value that changes along with the changes of liquid level is shown on the lead wires (A) and (B). Therefore, the utility model can provide the control and display device with an electric singal changing along with the changes of the liquid level. Because the sensor adopts the magnetic sensing design, the utility model needs no any conductivity for the controlled liquid and never causes any factors such as sparkle and static. And meanwhile, the sensor can be positioned in the inner or the outer side of the vessel (V) in accordance with the needs, and is a liquid level sensor used for all kinds of flowing liquid storing vessels.

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, a kind of solar water heater water tank, water tower of being used for of more specifically saying so, liquid level control, measurement and the display device of 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, its sensor is the electric probe that adopts metal material to make mostly, utilize the electric conductivity of liquid to record the liquid level high-low signal, utilize the electric conductivity of conducting liquid that this conversion of signals is become 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 can not 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, the electric signal that reliablely and stablely provides liquid to change in container can be provided for a long time, thereby guarantee the normal use of solar water heater, water tower and other liquid filling container.

The technical matters that the utility model mainly solves realizes 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 and the special-purpose backflow connector formation that is used to be connected sensor and container liquid in-out; its interior pipe is contained in the outer tube; two seals with seal; be separately installed with magnetic switch on the outer wall of inner tube in annular seal space; resistive element; extension line; its outer tube plays sealing and protective effect; its interior Guan Quanguan connects; the one group of spacer pin that is used to control and show the liquid level height is installed in aforementioned tube; the one group of magnetic float that is used to control magnetic switch that can fluctuate in pipe is being installed between the above-mentioned spacer pin; above-mentioned magnetic float is respectively by housing; magnet chamber; permanent magnet; sealing buoyancy cavity constitutes, and it can be installed in opening or closing of one group of magnetic switch on the outer wall of inner tube along with liquid level just changes the control that fluctuates.

According to by the environment of observing and controlling liquid, the needs of character, liquid level sensor can be installed with the following methods, too high as the liquid in container temperature, and container is the single tube liquid in-out, as solar water heater water tank etc., can adopt the mounting means of Fig. 4, under outside of containers, import and export special-purpose backflow connector is installed on the pipeline, special-purpose backflow connector is respectively by branch pipe tee connection, pipe in the liquid in-out, seal constitutes, the interior external diameter of pipe of above-mentioned special connector is less than the former reservation liquid in-out of container internal diameter of the pipeline, between them, form a return flow line, pipe is installed in the branch pipe tee connection in its liquid in-out, seal by seal between the outer wall of interior Guan Yitou and the inwall of threeway, insert in the liquid in-out pipeline of container reservation the other end of interior pipe, its length is longer than the length that container is reserved the liquid in-out pipeline, the interface that makes progress in threeway is connected with the interior pipe of sensor lower end, notice during installation that sensor should be vertical, this moment as liquid will be mobile by the return flow line between pipe and the container reservation liquid in-out pipeline in the connector when in the container liquid being arranged, the liquid level of the interior pipe of assurance sensor is consistent with the liquid level in the container, if container be the sealing or institute's liquid storage body volatility is arranged, can adopt the mounting means of Fig. 5, the interior pipe of liquid level sensor all is communicated with container intracavity at two up and down, make the interior liquid level of container consistent with pipe liquid level in the sensor, as the liquid in the container is conventional liq such as water etc., and liquid is nature normal temperature, and sensor can directly be suspended in the container.

Above-mentioned magnetic switch is connected with resistive element, it is along with magnetic switch opens or closes, on extension line, will reflect a resistance value that changes with the variation of liquid in container liquid level, offer control and electric signal that changes with liquid level change of display device.

The floating outer wall of above-mentioned magnetic has anti-absorption ring, and the magnetic float is fluctuated with liquid level change in pipeline reliably.

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.

Above-mentioned special-purpose backflow connector it can make liquid level sensor not be subjected to external liquid in-out pressure influence, can make liquid level sensor that the signal of liquid level change in the container is provided exactly reliably by reflux.

The utility model liquid level sensor has following advantage: the magnetic switch of this sensor, resistive element, in the cavity in pinout connector all is sealed between pipe and the outer tube, do not contact with the liquid in the container, therefore can be on sensor contact incrustation or slow electrolysis takes place, therefore this sensor can use for a long time, because changing according to the liquid in container liquid level, it is reflected in resistance value that correspondingly changes on the extension line, so it can 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 produce 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.

Description of drawings

Fig. 1 is the electrical schematic diagram of liquid level sensor;

Fig. 2 is the diagrammatic cross-section of liquid level sensor;

Fig. 3 is the diagrammatic cross-section of magnetic float 3 among Fig. 2;

Fig. 4 is liquid level sensor 2 scheme of installation on single tube liquid in-out container;

Fig. 5 is the scheme of installation on liquid level sensor and the airtight container;

Fig. 6 is the diagrammatic cross-section of the special-purpose backflow connector 6 of liquid level sensor among Fig. 4;

Embodiment

Fig. 1 comprises the interior pipe 21 of up/down perforation to liquid level sensor 2 shown in Figure 6; outer tube 22; its interior pipe 21 is contained in the middle of the outer tube 22; seal with seal 24 between interior pipe 21 outer walls and outer tube 22 inwall two; between interior pipe 21 and outer tube 22, form a sealed cavity 25; one group of magnetic switch S is installed in sealed cavity 25; resistive element R; extension line A; B; 22 sealings of its outer tube and protective effect; the one group of spacer pin 23 that is used to control and show the liquid level height is installed on the tube wall of its interior pipe 21; spacer pin 23 stops the effect of 3 drifts of magnetic float and landing in addition; the one group of magnetic float 3 that is used to control magnetic switch S is installed between spacer pin 23; magnetic float 3 is respectively by housing 31; magnet chamber 35; permanent magnet 32 is housed in magnet chamber 35; sealing buoyancy cavity 33; anti-absorption ring 34 is arranged on the housing 31, and the external diameter of above-mentioned anti-absorption ring 34 is less than the internal diameter of interior pipe 21.

Above-mentioned magnetic switch S ₁, S ₂, S ₃Be connected with resistive element R respectively ₁, R ₂, R ₃, along with magnetic control aperture S ₁, S ₂, S ₃Open or close, on extension line A, B, present a resistance value that just changes with liquid level and change.

According to by the environment of observing and controlling liquid, the needs of character, liquid level sensor 2 can be installed in the following way, too high and container V is single tube liquid in-out such as solar water heater water tank etc. as fluid temperature in the container V, can adopt the mounting means of 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 is respectively by branch pipe tee connection 61, pipe 62 in the liquid in-out, seal 63 constitutes, the external diameter of pipe 62 is less than the former reservation liquid in-out of container V internal diameter of the pipeline in the liquid in-out of connector 6, between interior pipe 62 and former reservation pipeline, form a return flow line 64, seal by seal 63 between outer wall of pipe 62 and threeway 61 inwalls in pipe 62 is installed in the branch pipe tee connection 61 in the liquid in-out of connector 6, insert in the pipeline of container V reservation the other end of interior pipe 62, the length that the length of interior pipe 62 is longer than the former reservation pipeline of container, pipe 21 is connected in the lower end of interface that threeway 61 makes progress and sensor 2, notice during installation that sensor 2 should be vertical, this moment is when having liquid in the container V, flow in return flow line 64 between the liquid in-out pipeline that liquid will be reserved by the interior pipe 62 and the container V of connector 6, liquid level in the interior pipe 21 of assurance sensor 2 is consistent with the liquid level in the container V, if container V be the sealing or institute's liquid storage body be volatile, can adopt the mounting means of Fig. 5, the interior pipe 21 of sensor 2 all is communicated with container V inner chamber up and down, make the liquid level in the interior pipe 21 of sensor 2, pressure is interior consistent with container V, as the liquid in the container V is conventional liq such as water etc., and fluid temperature can be suspended on liquid level sensor 2 among the container V for nature normal temperature.

Liquid level sensor 2 is vertically mounted on as on Fig. 4, the container V shown in Figure 5, and this moment, 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 S as not having liquid among the container V ₁, S ₂, S ₃Be subjected to magnetic force control, the whole adhesives in contact, resistive element R ₁, R ₂, R ₃With R ₀All be connected in parallel in the circuit, 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, and the contact disconnects, and this moment, circuit lost R ₁Parallel connection, resistance value increases, and liquid rises gradually in the container V, and the limited pin 23 of magnetic float 3-1 blocks no longer come-up, and the resistance value on the circuit remains unchanged, and upwards floats magnetic switch S when magnetic float 3-2 is subjected to buoyancy ₂Lose magnetic force control contact and disconnect, circuit loses R ₁, R ₂Parallel connection is presented on the resistance value corresponding increase of A, B end, and liquid level continues to rise, and 3-2 is blocked by spacer pin 23 to float, and 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 S ₃Lose magnetic force control, the contact disconnects, and this moment, circuit had only R ₀Resistance value, the resistance value maximum that A, 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 value that A, B two ends are presented descends with liquid level and reduces, just can obtain one and so forth reliably with the resistance value of liquid level change through changing, provide an electric signal that changes with liquid level change to liquid level control and display device, thereby correctly control and show liquid level among the container V.

Claims

1, a kind of liquid level sensor it comprise interior pipe (21), outer tube (22), extension line (A), (B), seal (24), it is characterized in that: it also comprises one group of magnetic switch (S), spacer pin (23), resistive element (R) and the one group of magnetic float (3) that is used to control magnetic switch (S) that is used to control the interior liquid of container (V), magnetic float (3) is respectively by housing (31), magnet chamber (35), permanent magnet (32), sealing buoyancy cavity (33) are housed in magnet chamber (35), absorption ring (34) is arranged on the housing (31).

2, liquid level sensor according to claim 1, it is characterized in that: do not do the time spent when magnetic float (3) is subjected to liquid buoyancy, magnetic switch (S) is subjected to magnetic float (3) the magnetic force control closing of contact, when magnetic float (3) liquid body buoyancy was upwards floated, magnetic switch (S) lost magnetic force control contact and opens.

3, liquid level sensor according to claim 1 and 2, it is characterized in that: above-mentioned liquid level sensor (2), it is to be vertically mounted on the outer side-lower liquid in-out of container (V) tube edge by the interior pipe (21) that special connector (6) connects liquid level sensor (2), special-purpose backflow connector (6) respectively by branch pipe tee connection (61), import and export pipe (62) in the liquid, seal (63) formation.

4, liquid level sensor according to claim 3 is characterized in that: special-purpose backflow connector (6), liquid in-out in the external diameter of pipe (62) reserve the liquid in-out internal diameter of the pipeline less than container (V), between them, form return flow line (64).

5, according to claim 3 or 4 described liquid level sensors, it is characterized in that: the length of pipe (62) is longer than container (V) and is reserved the liquid in-out duct length in the liquid in-out of special-purpose backflow connector (6).

6, according to claim 3 or 4 described liquid level sensors, it is characterized in that: it is to be vertically mounted on container (V) outside by interior pipe (21) two that pipe fitting connects liquid level sensor (2) to be communicated with by pipe fitting and container (V) are interior for a liquid level sensor (2).

7, according to claim 3 or 4 described liquid level sensors, it is characterized in that: it is hung vertically in its liquid level sensor (2) in the container (V).