CN211477321U

CN211477321U - Water tank liquid level sensing device

Info

Publication number: CN211477321U
Application number: CN201922369002.9U
Authority: CN
Inventors: 邓德华; 陈智华
Original assignee: Chuandong Magnetic Electronic Co Ltd
Current assignee: Chuandong Magnetic Electronic Co Ltd; Foshan Chuandong Magnetoelectricity Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-11
Anticipated expiration: 2029-12-24

Abstract

The utility model discloses a water tank liquid level sensing device, which comprises a box body, a cover body and a liquid level sensing mechanism, wherein the liquid level sensing mechanism comprises a guide pipe, an annular floating body, a permanent magnet, a circuit board arranged in an installation cavity, a first resistor, a second resistor, a third resistor, a first reed pipe and a second reed pipe which are arranged on the circuit board, and a plug electrically connected with the circuit board; the input end of the plug is connected with the output end of the plug sequentially through the first resistor, the second resistor and the third resistor. When the resistance value of the controller is less than the set value, the electric valve is controlled to automatically add water into the water tank, so that the liquid level of the water tank is kept in a preset range, and the equipment keeps better air injection amount. In addition, because the control current required by the controller is small, the liquid level sensing mechanism can work under the working condition of low current, the contact adhesion caused by overlarge current of the reed switch is avoided, the action failure is avoided, and the energy-saving effect is also achieved.

Description

Water tank liquid level sensing device

Technical Field

The utility model relates to a liquid level automatic measuring device field, in particular to water tank liquid level sensing device.

Background

The water tanks are arranged in the garment steamer or the humidifier, and water in the water tanks can be heated to form steam to be discharged to the outside of the water tanks, so that the water tanks are supplemented in time, the liquid level of the water tanks is automatically adjusted, and the equipment keeps the better air injection amount. The existing liquid level adjusting device adopts a reed switch and a relay to form a basic detecting element, a magnetic floating block rises or falls along with the change of the liquid level, and the magnetic floating block can trigger the corresponding reed switch to communicate with a corresponding circuit, so that a controller controls a water injection valve to be opened or closed. However, in such a liquid level control device, the current of the control circuit is large, and the reed in the reed pipe is easily stuck due to the excessive current, which causes operation failure.

It is seen that improvements and enhancements to the prior art are needed.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing prior art, an object of the present invention is to provide a water tank liquid level sensing device, which aims to reduce the current of a control circuit and improve the reliability of liquid level adjustment.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a water tank liquid level sensing device comprises a tank body with an opening at the upper end, a cover body covering the opening of the tank body, and a liquid level sensing mechanism fixedly arranged on the cover body, wherein the liquid level sensing mechanism comprises a guide pipe with an installation cavity, an annular floating body sleeved on the guide pipe, a permanent magnet arranged in the annular floating body, a circuit board arranged in the installation cavity, a first resistor, a second resistor, a third resistor, a first reed pipe, a second reed pipe and a plug electrically connected with the circuit board, wherein the guide pipe is arranged in the installation cavity; the input end of the plug is connected with the output end of the plug sequentially through a first resistor, a second resistor and a third resistor, one end of a second reed switch is connected with the output end of the plug, the other end of the second reed switch is connected with one end of the second resistor, one end of the first reed switch is connected with the output end of the plug, and the other end of the first reed switch is connected with the other end of the second resistor; the first reed switch and the second reed switch are axially arranged along the guide pipe, and the first reed switch is positioned below the second reed switch; the guide pipe is vertically arranged, and the annular floating body can slide up and down along the guide pipe along with the change of the liquid level in the box body, so that the permanent magnet triggers the on-off of the first reed switch or the second reed switch.

The circuit board, the plug and the connecting part of the circuit board are completely wrapped by a glue box, the glue box is formed by pouring insulating resin, and the shape of the glue box is matched with that of the mounting cavity.

The pipe is including the screw thread head, locking ring, spacing section, the liquid level control section that set gradually, first tongue tube and second tongue tube set up the inside at the liquid level control section, angle such as angle is provided with two at least stoppers along circumference on the spacing section, the bottom of liquid level control section is equipped with a jump ring, the stopper is used for restricting annular body and upwards slides, the jump ring is used for restricting annular body and breaks away from the liquid level control section.

The clamp spring is C-shaped, an annular groove is formed in the bottom end of the guide pipe, the clamp spring is clamped into the annular groove, and a plurality of salient points are arranged on the end face of the clamp spring.

The outer wall of the liquid level adjusting section is provided with a plurality of convex strips at equal angles along the circumferential direction, and each convex strip is vertically arranged.

The upper surface of the cover body is provided with an installation seat, the top of the installation seat is provided with a through hole communicated with the interior of the box body, and the screw head penetrates through the through hole from bottom to top and is screwed into a locking nut.

And a waterproof ring is arranged between the locking ring and the through hole.

The bottom of box is provided with the ladder chamber that sinks, the ladder chamber that sinks includes first circular slot, second circular slot, the third circular slot that from top to bottom sets gradually, the internal diameter of first circular slot, second circular slot, third circular slot steadilys decrease in proper order, the box is equipped with the outlet and sinks ladder chamber intercommunication.

Has the advantages that:

the utility model provides a water tank liquid level sensing device, compared with the prior art, the controller can carry out the resistance value to the circuit in the level mechanism and detect, and when the controller detected the resistance value and is less than the setting value, will add water to the water tank is automatic, the annular body floats along with the change of liquid level, the permanent magnet in the annular body is through the break-make that triggers the tongue tube, change the resistance value in the circuit, thereby reach the effect of automatic control liquid level, the liquid level that makes the water tank keeps at a predetermined scope, thereby make equipment keep the jet-propelled volume of preferred. In addition, because the control current required by the controller is small, the liquid level sensing mechanism can work under the working condition of low current, the contact adhesion caused by overlarge current of the reed switch is avoided, the action failure is avoided, and the energy-saving effect is also achieved.

Drawings

Fig. 1 is the utility model provides a water tank level sensor's schematic structure diagram.

Fig. 2 is an exploded view of the water tank level sensor provided by the present invention.

Fig. 3 is the circuit schematic diagram of the water tank liquid level sensor provided by the utility model.

Fig. 4 is a perspective view of the conduit in the water tank level sensor provided by the present invention.

Fig. 5 is the utility model provides a stereogram of jump ring among water tank level sensor.

Detailed Description

The utility model provides a water tank liquid level sensing device, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following refers to the drawing and the embodiment is lifted the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

Referring to fig. 1-3, the present invention provides a liquid level sensing device for a water tank, which comprises a tank body 1 with an upper end opening, a cover body 2 covering the opening of the tank body, a liquid level sensing mechanism 3 fixedly arranged on the cover body, wherein the liquid level sensing mechanism 3 comprises a conduit 4 with an installation cavity, an annular floating body 51 sleeved on the conduit, a permanent magnet 52 arranged in the annular floating body, a circuit board 6 arranged in the installation cavity, a first resistor R1, a second resistor R2, a third resistor R3, a first reed pipe K1, a second reed pipe K2, and a plug 7 electrically connected with the circuit board; the input end of the plug is connected with the output end of the plug 7 sequentially through a first resistor R1, a second resistor R2 and a third resistor R3, one end of a second reed switch K2 is connected with the output end of the plug 7, the other end of the second reed switch K2 is connected with one end of a second resistor R2, one end of a first reed switch K1 is connected with the output end of the plug 7, and the other end of the first reed switch K1 is connected with the other end of the second resistor R2; the first reed switch K1 and the second reed switch K2 are arranged along the axial direction of the guide pipe 4, and the first reed switch K1 is positioned below the second reed switch K2; the guide pipe 4 is vertically arranged, and the annular floating body 51 can slide up and down along the guide pipe along with the change of the liquid level in the box body, so that the permanent magnet 52 triggers the on-off of the first reed switch K2 or the second reed switch K2.

Be provided with water inlet 21 and outlet 11 on the water tank, water inlet 21 leads to pipe and is connected with electric valve, plug 7 and controller electric connection, and the controller is through the circuit data of real-time detection liquid level sensing mechanism, the opening or closing of control electric valve to the height of regulation water tank liquid level. The controller is preferably a single chip microcomputer. Here, for convenience of welding assembly, the first resistor R1, the second resistor R2 and the third resistor R3 are all chip resistors R with the same resistance; in order to reduce the current of the circuit, the general resistances of the first resistor R1, the second resistor R2, and the third resistor R3 are set to be large, and their resistances are preferably set to 0.68k Ω.

For the sake of convenience of data description, it is assumed that R1, R2, R3, and 0.68k Ω: when the water tank is in a water-free or water-deficient state, the floater is arranged at the bottom of the guide pipe, the permanent magnet 52 in the annular floating body 51 magnetizes the reed in the first reed pipe K1, the first reed pipe K1 is switched on, at the moment, the resistance value between the plug input end 71 and the plug output end 72 is R1+ R2 which is 1.36K omega, after the detection module of the singlechip acquires the resistance value, the singlechip controls the electric valve to be opened, water is added into the water tank, and therefore the annular floating body 51 floats upwards and gradually gets away from the first reed pipe K1; when the annular floating body 51 floats to a position between the first reed pipe K1 and the second reed rod K2, the first reed pipe K1 is disconnected, the resistance value between the plug input end 71 and the plug output end 72 is R1+ R2+ R3 to 2.04K omega, after the detection module of the single chip microcomputer obtains the resistance value, water is continuously added into the water tank, the annular floating body 51 continuously floats upwards, after the resistance value rises to the position of the second reed pipe K2, the second reed pipe K2 is connected under the magnetization effect of the permanent magnet 52 in the annular floating body 51, the resistance value between the plug input end 71 and the plug output end 72 is R1 to 0.68K omega, the single chip microcomputer controls closing, and water adding of the water tank is stopped. When the water in the water tank is evaporated and reduced, the annular floating body 51 descends to a position between the first reed pipe K1 and the second reed pipe K2, the second reed pipe is disconnected, and then the resistance value between the plug input end 71 and the plug output end 72 is 2.04K omega, so that the singlechip control electric valve is used for supplementing water to the water tank. Therefore, when the single chip microcomputer detection module detects that the resistance value is less than the set value, the electric valve is controlled to automatically add water into the water tank, so that the liquid level of the water tank is kept in a preset range, and the equipment keeps better air injection amount. In addition, because the control current required by the single chip microcomputer is small, the liquid level sensing mechanism can work under the working condition of low current, the contact adhesion caused by overlarge current of the reed switch is avoided, the action failure is avoided, and the energy-saving effect is also achieved.

Specifically, the circuit board 6 and the connecting portion between the plug 7 and the circuit board 6 are completely wrapped by a glue box 61, the glue box is formed by pouring insulating resin, and the shape of the glue box is matched with that of the installation cavity. The insulating resin can position and waterproof seal the circuit board and the plug, and the electrical performance is ensured. The insulating resin is preferably an epoxy resin.

Further, please refer to fig. 4, the guide tube 4 includes a thread head 41, a locking ring 42, a limiting section 43, and a liquid level adjusting section 44, which are sequentially disposed, the first dry reed pipe K1 and the second dry reed pipe K2 are disposed inside the liquid level adjusting section 44, at least two limiting blocks 45 are disposed on the limiting section 43 along the circumferential direction at equal angles, a clamp spring 8 is disposed at the bottom end of the liquid level adjusting section 44, the limiting blocks are used for limiting the annular floating body from sliding upwards, and the clamp spring is used for limiting the annular floating body from separating from the liquid level adjusting section.

Preferably, referring to fig. 5, the clamp spring 8 is C-shaped, the bottom end of the catheter is provided with an annular groove 46, the clamp spring is clamped in the annular groove, and the end surface of the clamp spring is provided with a plurality of protruding points 81. Because the snap spring is provided with the salient points, the contact area with the floater is small, the problem that the annular floating body is adhered to the snap spring is solved, and therefore the misoperation caused by adhesion of the floater is avoided.

Preferably, referring to fig. 4, a plurality of convex strips 47 are arranged on the outer wall of the liquid level adjusting section 44 at equal angles along the circumferential direction, and each convex strip 47 is arranged vertically. Because the liquid level adjusting section is provided with the convex strip, the liquid level adjusting section is prevented from being adhered to the inner ring of the annular floating body.

Preferably, an installation base 22 is arranged on the upper surface of the cover body 2, a through hole 23 communicated with the interior of the box body is formed in the top of the installation base, and the screw head penetrates through the through hole from bottom to top and is screwed into a locking nut 91. Through setting up like this, liquid level sensing mechanism's dismouting is simple and convenient, fixes with the help of lid structure, and the position is accurate, can not swing because of the rivers of water tank.

Preferably, a waterproof ring 92 is arranged between the locking ring and the through hole. Through setting up waterproof circle, prevent that the box from turning on one's side the back, water flows from the through-hole.

Preferably, referring to fig. 1, a sunken step cavity 12 is formed in the bottom of the box body, the sunken step cavity includes a first circular groove 12a, a second circular groove 12b and a third circular groove 12c which are sequentially formed from top to bottom, inner diameters of the first circular groove 12a, the second circular groove 12b and the third circular groove 12c are sequentially decreased progressively, and the box body is provided with a water outlet communicated with the sunken step cavity. The annular float 51 will sink into the first circular groove 12a in case of lack of water in the tank and the circlip 8 will be installed in the second circular groove 12b and the bottom end of the conduit 4 will extend into the third circular groove 12 c. Through setting up like this, can prevent on the one hand that the bottom of box and pipe from taking place to interfere, on the other hand can make the water that remains in the water tank can flow into and sink in the stage chamber, then discharge through the outlet, avoid forming the incrustation scale.

It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.

Claims

1. A water tank liquid level sensing device is characterized by comprising a tank body with an opening at the upper end, a cover body covering the opening of the tank body, and a liquid level sensing mechanism fixedly arranged on the cover body, wherein the liquid level sensing mechanism comprises a guide pipe with an installation cavity, an annular floating body sleeved on the guide pipe, a permanent magnet arranged in the annular floating body, a circuit board arranged in the installation cavity, a first resistor, a second resistor, a third resistor, a first reed pipe, a second reed pipe and a plug electrically connected with the circuit board, wherein the guide pipe is arranged on the circuit board; the input end of the plug is connected with the output end of the plug sequentially through a first resistor, a second resistor and a third resistor, one end of a second reed switch is connected with the output end of the plug, the other end of the second reed switch is connected with one end of the second resistor, one end of the first reed switch is connected with the output end of the plug, and the other end of the first reed switch is connected with the other end of the second resistor; the first reed switch and the second reed switch are axially arranged along the guide pipe, and the first reed switch is positioned below the second reed switch; the guide pipe is vertically arranged, and the annular floating body can slide up and down along the guide pipe along with the change of the liquid level in the box body, so that the permanent magnet triggers the on-off of the first reed switch or the second reed switch.

2. The tank level sensor according to claim 1, wherein the circuit board and the connection portion of the plug and the circuit board are completely covered by a glue box, the glue box is formed by pouring insulating resin, and the shape of the glue box is matched with that of the mounting cavity.

3. The water tank liquid level sensing device of claim 1, wherein the conduit comprises a thread head, a locking ring, a limiting section and a liquid level adjusting section which are sequentially arranged, the first reed switch and the second reed switch are arranged inside the liquid level adjusting section, at least two limiting blocks are arranged on the limiting section at equal angles along the circumferential direction, a clamp spring is arranged at the bottom end of the liquid level adjusting section and used for limiting the annular floating body to slide upwards, and the clamp spring is used for limiting the annular floating body to be separated from the liquid level adjusting section.

4. The water tank liquid level sensing device of claim 3, wherein the clamp spring is C-shaped, the bottom end of the conduit is provided with an annular groove, the clamp spring is clamped in the annular groove, and a plurality of salient points are arranged on the end surface of the clamp spring.

5. The water tank liquid level sensing device of claim 3, wherein a plurality of convex strips are arranged on the outer wall of the liquid level adjusting section at equal angles along the circumferential direction, and each convex strip is arranged vertically.

6. The water tank liquid level sensing device of claim 3, wherein the upper surface of the cover body is provided with an installation seat, the top of the installation seat is provided with a through hole communicated with the interior of the tank body, and the screw head penetrates through the through hole from bottom to top and is screwed into a locking nut.

7. The tank level sensing device of claim 6, wherein a waterproof ring is disposed between the locking ring and the through hole.

8. The water tank liquid level sensing device of claim 1, wherein the bottom of the tank body is provided with a sinking ladder cavity, the sinking ladder cavity comprises a first circular groove, a second circular groove and a third circular groove which are sequentially arranged from top to bottom, the inner diameters of the first circular groove, the second circular groove and the third circular groove are sequentially decreased, and the tank body is provided with a water outlet communicated with the sinking ladder cavity.