Pipeline type liquid level sensor

Abstract

The utility model discloses a pipeline type liquid level sensor which comprises a water pipe, a shell is connected to the surface of one side of the water pipe, a PCB is arranged in an inner cavity of the shell, infrared emitting lamp beads, infrared receiving lamp beads and triodes are arranged on the PCB, lamp holders of the infrared emitting lamp beads and the infrared receiving lamp beads are arranged in parallel in a 45-degree inclined mode, and the triodes are arranged on the lamp holders of the infrared emitting lamp beads and the infrared receiving lamp beads. A boss is arranged on the connecting face of the water pipe and the shell, the boss is an asymmetric prism, two inclined faces parallel to the lamp holder are arranged on the boss, one end of the triode is connected with the infrared receiving lamp bead, the other end of the triode is connected with the signal line, and the triode achieves reverse level conversion on signals of the infrared receiving lamp bead. According to the utility model, the infrared rays are received by utilizing whether the infrared rays are subjected to secondary reflection in the boss and whether water exists in the water pipe is judged according to the level output by the signal line, so that whether the water tank is short of water is monitored in real time, and the boss is arranged outside the water pipe, so that liquid residues are reduced and the service life of the water tank is prolonged. And incrustation scale or deterioration of edible liquid is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level sensor technical field, concretely relates to a pipeline type liquid level sensor. BACKGROUND

[0002] Now domestic appliance or industrial equipment of water tank all need to monitor whether the water tank is short of water in real time, wherein the water level is detected by using a float detection device, but such structure needs to occupy a large space, is difficult to be used on small household appliances or equipment, in addition, the water level is detected by using a small volume pipeline liquid level sensor on the market, a boss is arranged inside the water pipe connected with the sensor to act as a triangular prism to achieve detection of whether there is liquid, in the case of long-term water or other liquid with viscosity, the boss is easy to produce scale or liquid with reverse viscosity is more easily attached to the surface, especially juice, milk and other edible liquids can cause deterioration. SUMMARY

[0003] The utility model discloses a pipeline type liquid level sensor, which realizes the reception of infrared rays by regular secondary refraction in the boss outside the water pipe, to solve the problems in the background art.

[0004] To achieve the above object, the utility model provides a pipeline type liquid level sensor, which comprises a water pipe, the left and right ends of the water pipe are provided with a water inlet end and a water outlet end, the water inlet end of the water pipe is connected with a water tank through a hose, and the water pipe is arranged at or below the bottom of the water tank, the water outlet end of the water pipe is connected with a water using component, one side surface of the water pipe is connected with a shell, a PCB board is arranged in the inner cavity of the shell and vertically opposite to the water pipe, an emitting lamp holder, a receiving lamp holder, a triode and a resistor are arranged on the inner side surface of the PCB board, infrared emitting beads and infrared receiving beads are respectively arranged on the emitting lamp holder and the receiving lamp holder, and the emitting lamp holder and the receiving lamp holder are arranged in a 45° inclined parallel manner, the shell is integrally arranged with the water pipe, the connecting surface of the water pipe and the shell is made of optical medium material, a boss is arranged on the connecting surface of the water pipe and the shell, the boss is a prism with an asymmetric shape, and the convex surface of the boss is arranged in the inner cavity of the shell, two parallel inclined surfaces are arranged on the boss, and the two inclined surfaces are arranged in parallel with the emitting lamp holder and the receiving lamp holder, wires are welded on the outer side surface of the PCB board, the wires have three wires, including two power lines and one signal line, one end of the triode is connected with the infrared receiving beads, the other end is connected with the signal line, and the triode converts the signal of the infrared receiving beads in a reverse level.

[0005] As a further improvement of the technical scheme, the water inlet end and the water outlet end of the water pipe are both provided with a step, and the water inlet end of the water pipe is connected with the hose through the step.

[0006] As a further improvement of the technical solution, the water pipe is provided with two round convex ribs and a horizontal convex rib on the outer circle of the side surface away from the shell.

[0007] As a further improvement of the technical solution, the emitting lamp holder is arranged in front of the inclined side of the receiving lamp holder.

[0008] As a further improvement of the technical solution, two positioning columns are respectively arranged on the opposite side walls of the shell inner cavity, and two corresponding grooves are respectively arranged on the outer surfaces of the two opposite sides of the PCB.

[0009] As a further improvement of the technical solution, the two positioning columns are respectively arranged on the non-opposite positions of the opposite side walls of the shell inner cavity, and the two grooves are respectively arranged on the non-opposite positions of the two opposite side surfaces of the PCB.

[0010] As a further improvement of the technical solution, the opening direction of the shell is vertically arranged with the water flow direction of the water pipe, a PCB potting glue is arranged between the outer side of the PCB and the opening of the shell, and a through hole for wire penetration is arranged on the PCB potting glue.

[0011] As a further improvement of the technical solution, the materials of the shell and the water pipe are both PCTG-TX1001.

[0012] Compared with the prior art, the utility model discloses the beneficial effect is: the utility model discloses the convex joint optical medium connecting surface as the prism with infrared emitting lamp pearl's infrared light vertical through a bevel after the regular second reflection, again vertical through another bevel and reflect to infrared receiving lamp pearl, triode plays the reverse level conversion to infrared receiving lamp pearl's signal, that is, when the liquid in the water pipe passes through the shell connecting section infrared emitting lamp pearl emits the infrared light that the first reflection enters the optical medium connecting surface after the convex, and the optical medium connecting surface cannot be reflected to infrared receiving lamp pearl after the second reflection because of the liquid in the inside, make infrared receiving lamp pearl emit the input signal of high level to triode, triode is turned on, and the signal line output signal is low level ( < 0.8V), when the liquid in the water pipe does not pass through the shell connecting section infrared emitting lamp pearl emits the infrared light that the first reflection enters the optical medium connecting surface after the convex, and the optical medium connecting surface is reflected to infrared receiving lamp pearl after the second reflection, make infrared receiving lamp pearl input signal of low level to triode, triode is cut off, and the signal line output signal is high level ( > 2.8V), thereby using infrared light whether the regular second reflection in the convex is realized infrared light's reception and the level height of signal line output judges whether the water pipe has water, and then realizes the real-time monitoring of whether the water tank is short of water, the device simple structure does not need to occupy very big space, is suitable for being used in small volume home appliance or equipment, and the shell is integrally arranged with the water pipe, and the convex is arranged at the outside of the water pipe, reduces liquid residue, avoids producing scale or causing edible liquid metamorphism. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0014] Figure 1 It is the perspective view of the pipeline type liquid level sensor of the embodiment of the utility model.

[0015] Figure 2 It is the explosion view of the pipeline type liquid level sensor of the embodiment of the utility model.

[0016] Figure 3 It is the sectional view of the pipeline type liquid level sensor of the embodiment of the utility model.

[0017] Figure 4 It is the structure schematic drawing of the pipeline type liquid level sensor of the embodiment of the utility model applied to the box.

[0018] Figure 5The light ray diagram between the infrared emitting lamp bead and the infrared receiving lamp bead in the water pipe with water state in the embodiment of the utility model.

[0019] Figure 6 The light ray diagram between the infrared emitting lamp bead and the infrared receiving lamp bead in the water pipe without water state in the embodiment of the utility model.

[0020] Figure 7 The working principle diagram of the pipeline type liquid level sensor of the embodiment of the utility model.

[0021] Figure 8 The circuit principle diagram of the pipeline type liquid level sensor of the embodiment of the utility model.

[0022] The figure mark is: water pipe 1, water inlet end 101, water outlet end 102, connecting surface 103, shell 2, PCB board 3, infrared emitting lamp bead 4, infrared receiving lamp bead 5, triode 6, boss 7, inclined surface 701, emitting lamp seat 8, receiving lamp seat 9, power line 10, signal line 11, step 12, round convex rib 13, horizontal convex rib 14, positioning column 15, recess 16, PCB potting glue 17, water tank 18, water using component 19, hose 20. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the embodiments of the utility model, and cannot be understood as the limitation of the utility model.

[0024] In the description of the embodiments of the utility model, it is understood that if the embodiments of the utility model involve directional indications, for example, the orientation or position relationship of up, down, left, right, front, back, inside and outside is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0025] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0026] In the embodiments of the utility model, unless there are explicit provisions and limitations, if there are terms such as ''installation'', ''connection'', ''connection'', ''fixing'', etc., they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or they can be integrated. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above-mentioned terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0027] As shown in Figures 1-8 The utility model discloses a pipeline formula liquid level sensor, including water pipe 1, water pipe 1 left and right both ends are equipped with water inlet end 101 and water outlet end 102, and the water inlet end 101 of water pipe 1 is connected with water tank 18 through hose 20, and water pipe 1 is arranged at the bottom position of water tank 18 or below the bottom position of water tank 18, and the water outlet end 102 of water pipe 1 is connected with water using part 19, and one side surface in water pipe 1 is connected with shell 2, and the inner chamber of shell 2 is installed with the PCB board 3 that is vertically opposite with water pipe 1, and the inner side of PCB board 3 is equipped with emitting lamp holder 8, receiving lamp holder 9, triode 6 and resistance, and infrared emitting lamp pearl 4 and infrared receiving lamp pearl 5 are respectively installed on emitting lamp holder 8 and receiving lamp holder 9, and emitting lamp holder 8 and receiving lamp holder 9 are horizontally 45 ° inclined parallel arrangement, and shell 2 is integrative with water pipe 1, reduces the risk of water leakage, and the connecting surface 103 material of water pipe 1 and shell 2 is optical medium material, and the connecting surface of water pipe 1 and shell 2 is equipped with boss 7, and boss 7 is the prism of asymmetric shape, and its convex surface is arranged in the inner chamber of shell 2, and two parallel inclined surfaces 701 are equipped on boss 7, and two inclined surfaces 701 are respectively arranged in parallel with emitting lamp holder 8 and receiving lamp holder 9, and the outer side of PCB board 3 is welded with wire, and the wire has three, including two power lines 10 and a signal line 11, one end of triode 6 is connected with infrared receiving lamp pearl 5, the other end is connected with signal line 11, and triode 6 plays reverse level conversion to the signal of infrared receiving lamp pearl 5.

[0028] In the embodiments, as shown in Figure 1 And Figure 4 The water inlet end 101 and the water outlet end 102 of the water pipe 1 are both provided with a step 12, and the water inlet end 101 of the water pipe 1 is connected with the hose 20 through the step 12.

[0029] Specifically, the step 12 is arranged to prevent the hose 20 from falling off and to improve the sealing performance of the hose 20.

[0030] In the embodiments, as shown in Figure 1As shown, the outer circle of the water pipe 1 away from the outer surface of the shell 2 is provided with two round convex ribs 13 and a horizontal convex rib 14, the horizontal convex rib 14 is arranged between the two round convex ribs 13, preventing misjudgment caused by the close proximity of the water pipe 1 to the reflective object.

[0031] In this embodiment, the emitting lamp holder 8 is arranged in front of the inclined side of the receiving lamp holder 9.

[0032] Specifically, the infrared emitting lamp bead and the infrared receiving lamp bead are parallel, and the infrared emitting lamp bead is in front of the infrared receiving lamp bead, avoiding self interference.

[0033] In this embodiment, as shown in the drawings, Figure 2 The opposite side walls of the inner cavity of the shell 2 are respectively provided with two longitudinally distributed positioning columns 15, and the outer surfaces of the two opposite sides of the PCB 3 are respectively provided with two recesses 16 corresponding to the positioning columns 15.

[0034] Specifically, the two recesses 16 and the two positioning columns 15 are interference fit, realizing the fixed installation of the PCB 3 in the shell 2, and ensuring the emission and reception of infrared rays.

[0035] In this embodiment, as shown in the drawings, Figure 2 And Figure 3 The two positioning columns 15 are respectively arranged on the non-opposite positions of the opposite side walls of the inner cavity of the shell 2, and the two recesses 16 are respectively arranged on the non-opposite positions of the two opposite side surfaces of the PCB 3, so that the foolproof is realized during assembly.

[0036] In this embodiment, as shown in the drawings, Figure 1 The opening direction of the shell 2 is vertically arranged with the water flow direction of the water pipe 1, and the PCB potting glue 17 is arranged between the outer side of the PCB 3 and the opening in the shell 2, and the through hole for the lead wire to pass through is arranged on the PCB potting glue 17.

[0037] Specifically, the setting of the PCB potting glue 17 plays a waterproof and moisture-proof role for the PCB 3.

[0038] In this embodiment, the materials of the shell 2 and the water pipe 1 are both PCTG-TX1001, which does not contain bisphenol A and can be used for food liquid.

[0039] As shown in the drawings, Figures 5-8 The working principle of the above pipeline type liquid level sensor is:

[0040] (1) when the water tank has liquid, the liquid in the water tank flows into the water pipe because the water pipe connected with the water tank is at the bottom of the water tank or below the bottom of the water tank, the infrared light emitted by the infrared emitting lamp bead (IR1) vertically passes through the inclined surface parallel to the emitting lamp seat of the boss, is reflected by the boss for the first time, enters the optical medium connecting surface, and is reflected to the infrared receiving lamp bead (PT1) because the optical medium connecting surface cannot make the second reflection due to the liquid on the inner side, the infrared receiving lamp bead (PT1) without receiving infrared light emits an input signal to the triode (Q1), the triode (Q1) performs reverse level conversion, makes the voltage of point A keep 5V high level, and makes the triode (Q1) conduct, and the voltage of point B output by the triode (Q1) to the signal line (OUT) is low level (<0.8V);

[0041] (2) when the water tank has no liquid, the water pipe also has no liquid flowing therethrough, the infrared light emitted by the infrared emitting lamp bead (IR1) vertically passes through the inclined surface parallel to the emitting lamp seat of the boss, is reflected by the boss for the first time, enters the optical medium connecting surface, and is reflected to the infrared receiving lamp bead (PT1) after the optical medium connecting surface makes the second reflection, the infrared receiving lamp bead (PT1) with receiving infrared light emits an input signal to the triode (Q1), the triode (Q1) performs reverse level conversion, makes the voltage of point A low, and becomes low level (<0.5V), the triode (Q1) cannot conduct, and the voltage of point B output by the triode (Q1) to the signal line (OUT) is high level (>2.8V).

[0042] The preferred embodiments are only a part of the utility model, and are not used to limit the utility model, and any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A pipe-type liquid level sensor, comprising a water pipe (1), characterized in that, The water pipe (1) has an inlet (101) and an outlet (102) at its left and right ends. The inlet (101) of the water pipe (1) is connected to the water tank (18) through a hose (20), and the water pipe (1) is located at the bottom of the water tank (18) or below the bottom of the water tank (18). The outlet (102) of the water pipe (1) is connected to the water-using component (19). A shell (2) is connected to one side of the middle of the water pipe (1). A PCB board (3) is installed in the inner cavity of the shell (2) and is vertically opposite to the water pipe (1). The inner side of the PCB board (3) is provided with a transmitting lamp holder (8), a receiving lamp holder (9), a transistor (6) and a resistor. An infrared transmitting lamp bead (4) and an infrared receiving lamp bead (5) are respectively installed on the transmitting lamp holder (8) and the receiving lamp holder (9), and the transmitting lamp holder (8) and the receiving lamp holder (9) are inclined at 45° to the horizontal. The outer shell (2) and the water pipe (1) are integrated in parallel. The material of the connection surface (103) between the water pipe (1) and the outer shell (2) is an optical medium material. The connection surface (103) between the water pipe (1) and the outer shell (2) is provided with a boss (7). The boss (7) is an asymmetrical prism, and its convex surface is provided in the inner cavity of the outer shell (2). The boss (7) is provided with two parallel inclined surfaces (701), and the two inclined surfaces (701) are respectively parallel to the transmitting lamp holder (8) and the receiving lamp holder (9). The outer side of the PCB board (3) is welded with wires. The wires have three wires, including two power lines (10) and one signal line (11). One end of the transistor (6) is connected to the infrared receiving lamp bead (5), and the other end is connected to the signal line (11). The transistor (6) performs reverse level conversion on the signal of the infrared receiving lamp bead (5).

2. The pipeline-type liquid level sensor according to claim 1, characterized in that, The water pipe (1) has steps (12) at both the inlet (101) and outlet (102) and the inlet (101) is connected to the hose (20) via the steps (12).

3. A pipeline-type liquid level sensor according to claim 1, characterized in that, The water pipe (1) has two round ribs (13) and one horizontal rib (14) on the outer ring of the side of the water pipe (1) away from the outer shell (2), and the horizontal rib (14) is located between the two round ribs (13).

4. The pipeline-type liquid level sensor according to claim 1, characterized in that, The transmitting lamp holder (8) is positioned in front of the inclined side of the receiving lamp holder (9).

5. A pipeline-type liquid level sensor according to claim 1, characterized in that, Two longitudinally distributed positioning posts (15) are respectively provided on the opposite side walls of the inner cavity of the outer shell (2), and two grooves (16) corresponding to the positioning posts (15) are respectively provided on the outer surfaces of the two opposite sides of the PCB board (3).

6. A pipeline-type liquid level sensor according to claim 5, characterized in that, The two positioning posts (15) are respectively set on the non-relative positions of the opposite side walls of the inner cavity of the outer shell (2), and the two grooves (16) are respectively set on the non-relative positions of the two opposite side surfaces of the PCB board (3).

7. A pipeline-type liquid level sensor according to claim 1, characterized in that, The opening of the outer shell (2) is vertically aligned with the water flow direction of the water pipe (1). Inside the outer shell (2), between the outer side of the PCB board (3) and the opening, there is a PCB potting compound (17), and the PCB potting compound (17) has through holes for wires to pass through.

8. A pipeline-type liquid level sensor according to claim 1, characterized in that, The outer shell (2) and the water pipe (1) are both made of PCTG-TX1001.

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