Novel pipeline type liquid level sensor
By designing symmetrical protrusions on the outside of the water pipe for triple reflection of infrared light and a light-blocking plate, the problems of large space occupation and inaccurate detection of liquid level sensors on small equipment are solved, thus achieving efficient and accurate water level monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2026-03-24
AI Technical Summary
Existing liquid level sensors take up a lot of space in small household appliances or equipment, and the protrusions are prone to scale or viscous liquid adhesion, leading to inaccurate detection.
Infrared light is reflected three times by symmetrical protrusions on the outside of the water pipe, and black light-blocking plates are used to avoid interference. A transistor is used to convert the signal and determine the water level.
It enables water level detection on small equipment without occupying a lot of space, avoids scale and liquid deterioration, and ensures detection accuracy.
Smart Images
Figure CN224034731U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to liquid level sensor technical field, concretely relates to a novel pipeline 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 using float or the like detection device detects water level, but such structure needs to occupy very big space, is difficult to be used on small volume home appliance or equipment, in addition, using small volume pipeline liquid level sensor on market detects water level, will set up boss in the inside of water pipe connected with sensor and act as triangular prism effect, to reach detects whether there is liquid, in the case of long -term water or other liquid with viscosity, boss is easy to produce incrustation or liquid with viscosity more easily adheres to the surface, especially juice, milk this kind of edible will cause metamorphic, and no matter the light of sensor emission end is in boss from left to right or from right to left reflection, the lamp pearl of side by side is interfered and appears incorrect detection problem. SUMMARY
[0003] The utility model discloses a novel pipeline liquid level sensor, utilize the regular three times reflection of infrared light in the symmetry boss outside the water pipe to realize the reception of infrared light, and utilize the black light shield between two lamp pearls to avoid self interference, to solve the problem in the above background technique.
[0004] In order to achieve the above object, the utility model provides a novel pipeline formula liquid level sensor, including water pipe, the left and right two ends of water pipe are equipped with water inlet end and water outlet end, the water inlet end of water pipe is connected with water tank through hose, and water pipe sets up in water tank bottom position or below water tank bottom position, the water outlet end of water pipe is connected with water using part, one side surface of water pipe is connected with shell, the inner chamber of shell is installed with the PCB board that is vertically opposite with water pipe, the inner side of PCB board is equipped with emission lamp stand, receiving lamp stand, triode and resistance, infrared emission lamp pearl and infrared receiving lamp pearl are installed on emission lamp stand, receiving lamp stand respectively, the inner chamber center of shell is provided with black light barrier, and emission lamp stand, receiving lamp stand are about light barrier horizontal symmetry and set up, the shell is integrative with water pipe, and the connecting surface material of water pipe and shell is optical medium material, the connecting surface of water pipe and shell is equipped with two symmetrical bosses, two bosses are the prisms that are inclined to the left and right two outer sides of shell 62.50 DEG, and its convex surface sets up in the inner chamber of shell, two bosses top respectively set in the just below infrared emission lamp pearl and infrared receiving lamp pearl, the outer side of PCB board is welded with wire, the wire has three, including two power lines and a signal line, one end of triode is connected with infrared receiving lamp pearl, the other end is connected with signal line, and triode plays reverse level conversion to the signal of infrared receiving lamp pearl.
[0005] As a further improvement of the technical solution, the water inlet end and the water outlet end of the water pipe are both provided with steps, and the water inlet end of the water pipe is connected with the hose through the steps.
[0006] As a further improvement of the technical solution, the outer circle of the side surface of the water pipe away from the shell is provided with two circular convex ribs and a horizontal convex rib, and the horizontal convex rib is arranged between the two circular convex ribs.
[0007] As a further improvement of the technical solution, the light barrier is vertically arranged, and the light barrier is detachably connected between the two bosses.
[0008] As a further improvement of the technical solution, the two positioning columns are respectively arranged at non-opposite positions of the opposite side walls in the inner chamber of the shell, and the two grooves are correspondingly arranged at non-opposite positions of the two opposite side surfaces of the PCB board.
[0009] As a further improvement of the technical solution, the two positioning columns are respectively arranged at non-opposite positions of the opposite side walls in the inner chamber of the shell, and the two grooves are correspondingly arranged at non-opposite positions of the two opposite side surfaces of the PCB board.
[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, and the PCB potting glue is arranged between the outer side of the PCB board and the opening in the inner chamber of the shell, and the through hole for the wire to pass through is formed in the PCB potting glue.
[0011] As a further improvement of the technical solution, the material of the shell and the water pipe is PCTG-TX1001.
[0012] Compared with the prior art, the utility model discloses the beneficial effects are: the utility model discloses two symmetrical as the prism's boss combination optical medium connecting surface with infrared emitting lamp pearl's infrared light vertically downward shoot into the boss and pass three times reflection, again vertically upward shoot and give infrared receiving lamp pearl, triode plays the reverse level conversion to infrared receiving lamp pearl's signal, that is, when the water pipe has water and passes through the shell connecting section, infrared emitting lamp pearl emits the infrared light and passes through the boss first reflection and enters the optical medium connecting surface, and because the inner side has liquid, so cannot second reflection to another boss and make third reflection to infrared receiving lamp pearl, make infrared receiving lamp pearl emit the input signal to triode as high level, triode conduction, signal line output signal is low level ( < 0.8V), when the water pipe does not have water and passes through the shell connecting section, infrared emitting lamp pearl emits the infrared light and passes through the boss first reflection and enters the optical medium connecting surface, and passes through its second reflection to another boss and makes third reflection to infrared receiving lamp pearl, make infrared receiving lamp pearl input signal to triode as low level, triode cut-off, signal line output signal is high level ( > 2.8V), thereby utilize infrared light and whether obtain three times reflection between two bosses to realize 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 on small volume household electrical appliances or equipment, and the shell and water pipe are integrally arranged, and the boss is arranged outside the water pipe, liquid residue is reduced, scale or edible liquid metamorphism is avoided, in addition, the light barrier is arranged between two bosses, prevents and arranges the interference of the lamp pearl itself. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.
[0014] Figure 1 It is the perspective view of the novel pipeline type liquid level sensor of the utility model embodiment.
[0015] Figure 2 It is the explosion view of the novel pipeline type liquid level sensor of the utility model embodiment.
[0016] Figure 3The utility model discloses a sectional view of novel pipeline type liquid level sensor.
[0017] Figure 4 The utility model discloses a structure schematic drawing of novel pipeline type liquid level sensor of the utility model embodiment is applied to the box.
[0018] Figure 5 The utility model discloses the light line diagram between infrared emission lamp pearl and infrared receiving lamp pearl under the water pipe no water state in the utility model embodiment.
[0019] Figure 6 The utility model discloses the light line diagram between infrared emission lamp pearl and infrared receiving lamp pearl under the water pipe no water state in the utility model embodiment.
[0020] Figure 7 The utility model discloses a working principle diagram of novel pipeline type liquid level sensor.
[0021] Figure 8 The utility model discloses a circuit principle diagram of novel pipeline type liquid level sensor.
[0022] The figure mark is: water pipe 1, inlet end 101, outlet end 102, connecting face 103, shell 2, PCB board 3, infrared emission lamp pearl 4, infrared receiving lamp pearl 5, triode 6, boss 7, emission lamp seat 8, receiving lamp seat 9, power cord 10, signal line 11, step 12, round convex rib 13, horizontal convex rib 14, light barrier 15, positioning column 16, recess 17, PCB potting glue 18, water tank 19, hose 20, water component 21. DETAILED DESCRIPTION
[0023] The embodiments of the utility model are described in detail below, and 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 utility model embodiments, it is understood that if the utility model embodiments involve directional indications, such as up, down, left, right, front, back, inside, outside, the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model embodiments 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 used for descriptive purposes and cannot be understood to indicate or imply relative importance or imply the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited.
[0026] In the embodiments of the present application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connection", "connection", "fixing" and the like, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0027] As shown in Figures 1-8 The utility model discloses a novel pipeline formula liquid level sensor, including water pipe 1, and water pipe 1 left and right two 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 19 through hose 20, and water pipe 1 sets up at water tank 19 bottom position or below water tank 19 bottom position, and the water outlet end 102 of water pipe 1 is connected with water using part 21, and one side surface of water pipe 1 middle 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 (not marked in the drawing), and infrared emitting lamp pearl 4 and infrared receiving lamp pearl 5 are installed on emitting lamp holder 8 and receiving lamp holder 9 respectively, and the center of the inner chamber of shell 2 is provided with black light barrier 15, and emitting lamp holder 8 and receiving lamp holder 9 are horizontally symmetrical about light barrier 15, and shell 2 is integrative with water pipe 1, has reduced the risk of water leakage, and the connecting surface 103 of water pipe 1 and shell 2 is optical medium material, and the connecting surface 103 of water pipe 1 and shell 2 is equipped with two symmetrical bosses 7, and two bosses 7 are the prisms that are inclined to the left and right two outer sides of shell 2 62.50 °, and the convex surface thereof is arranged in the inner chamber of shell 2, and the top of two bosses 7 is arranged directly below infrared emitting lamp pearl 4 and infrared receiving lamp pearl 5 respectively, 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 of the present application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connection", "connection", "fixing" and the like, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances. Figure 1 and Figure 2As shown, 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 with the hose 20.
[0030] In the embodiment, as shown in Figure 1 the outer circle of the surface of the water pipe 1 away from the shell 2 is provided with two circular convex ribs 13 and a horizontal convex rib 14, and the horizontal convex rib 14 is arranged between the two circular convex ribs 13 to prevent misjudgment caused by the close proximity of the water pipe 1 to reflective objects.
[0031] In the embodiment, as shown in Figure 2 and Figure 3 the light shielding sheet 15 is arranged vertically, and the light shielding sheet 15 is detachably connected between the two bosses 7.
[0032] Specifically, the arrangement of the light shielding sheet 15 avoids the interference of the infrared emitting lamp bead 4 and the infrared receiving lamp bead 5.
[0033] In the embodiment, as shown in Figure 2 two positioning columns 16 are arranged on the opposite side walls in the inner cavity of the shell 2, and two recesses 17 corresponding to the positioning columns 16 are arranged on the outer surfaces of the two opposite sides of the PCB 3.
[0034] Specifically, the two recesses 17 and the two positioning columns 16 are in interference fit to realize the fixed installation of the PCB 3 in the shell 2, and to ensure the emission and reception of infrared rays.
[0035] In the embodiment, as shown in Figure 2 and Figure 3 the two positioning columns 16 are arranged on the non-opposite positions of the opposite side walls in the inner cavity of the shell 2, and the two recesses 17 are correspondingly arranged on the non-opposite positions of the two opposite side surfaces of the PCB 3, so that the foolproof assembly is realized.
[0036] In the embodiment, as shown in Figure 2 the opening direction of the shell 2 and the water flow direction of the water pipe 1 are arranged vertically, and the PCB potting glue 18 is arranged between the outer side of the PCB 3 and the opening in the inner cavity of the shell 2, and the PCB potting glue 18 is provided with a through hole for the lead wire to pass through.
[0037] Specifically, the arrangement of the PCB potting glue 18 plays a waterproof and moisture-proof role for the PCB 3.
[0038] In the 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 the passage of food liquid.
[0039] As Figures 5-8 shown in the above new pipeline type liquid level sensor working principle:
[0040] (1) using power line (VCC-GND) to PCB 3 power on, when the water tank 19 has water, because the water pipe 1 in communication with the water tank 19 is in the bottom of the water tank 19 or below the bottom of the water tank 19, the water in the water tank 19 flows into the water pipe 1, the infrared emitting lamp bead (IR1) emits infrared light vertically downward, after the first reflection of a boss 7 into the optical medium connecting surface 103, due to the inside surface has liquid and cannot be reflected to another boss 7 for the third time to the infrared receiving lamp bead (PT1), the infrared receiving lamp bead (PT1) without receiving infrared light to the input signal of triode (Q1), triode (Q1) plays a reverse level conversion, makes A point keep 5V high level, makes triode (Q1) conduct, the voltage of B point output by triode (Q1) to signal line (OUT) is low level (<0.8V);
[0041] (2) when the water tank 19 has no water, the water pipe 1 also has no water flow, the infrared emitting lamp bead 4 (IR1) emits infrared light vertically downward, after the first reflection of a boss 7 into the optical medium connecting surface 103, after the second reflection to another boss 7 for the third time to the infrared receiving lamp bead (PT1), the infrared receiving lamp bead (PT1) with receiving infrared light to the input signal of triode (Q1), triode (Q1) plays a reverse level conversion, makes A point voltage low to low level (<0.5V), makes triode (Q1) unable to conduct, the voltage of B point output by triode (Q1) to signal line (OUT) is high level (>2.8V).
[0042] The above is only the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A novel pipeline-type liquid level sensor, comprising a water pipe (1), characterized in that, The water pipe (1) has an inlet end (101) and an outlet end (102) at both ends. The inlet end (101) of the water pipe (1) is connected to the water tank (19) through a hose (20). The water pipe (1) is located at the bottom of the water tank (19) or below the bottom of the water tank (19). The outlet end (102) of the water pipe (1) is connected to the water-using component (21). 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). A black light-blocking plate (15) is provided in the center of the inner cavity of the shell (2). The light-blocking plate (15) is horizontally symmetrically arranged. The outer shell (2) and the water pipe (1) are integrated. The material of the connection surface (103) between the water pipe (1) and the outer shell (2) is an optical medium material. Two symmetrical protrusions (7) are provided on the connection surface (103) between the water pipe (1) and the outer shell (2). The two protrusions (7) are prisms that are tilted 62.50° to the left and right sides of the outer shell (2). Their convex surfaces are set in the inner cavity of the outer shell (2). The tops of the two protrusions (7) are respectively set directly below the infrared emitting lamp bead (4) and the infrared receiving lamp bead (5). The outer side of the PCB board (3) is welded with wires. There are 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 for the signal of the infrared receiving lamp bead (5).
2. The novel 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. The novel 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. A novel pipeline-type liquid level sensor according to claim 1, characterized in that, The light-blocking plate (15) is vertically arranged and can be detachably connected between the two protrusions (7).
5. A novel pipeline-type liquid level sensor according to claim 1, characterized in that, Two longitudinally distributed positioning posts (16) are respectively provided on the opposite side walls of the inner cavity of the outer shell (2), and two grooves (17) corresponding to the positioning posts (16) are respectively provided on the outer surfaces of the two opposite sides of the PCB board (3).
6. A novel pipeline-type liquid level sensor according to claim 5, characterized in that, The two positioning posts (16) 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 (17) are respectively set on the non-relative positions of the two opposite side surfaces of the PCB board (3).
7. A novel 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 (18), and the PCB potting compound (18) has through holes for wires to pass through.
8. A novel 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.