阅读说明：本技术 一种光电式液位传感器 (Photoelectric liquid level sensor ) 是由 刘显生 郭惠均 于 2021-07-31 设计创作，主要内容包括：本发明属于一种光电式液位传感器,其包括浮球组件、光电控制组件、安装组件；浮球组件包括浮球、浮球导杆、螺母A、螺母B和过滤网；光电控制组件包括透明外壳、PCB板、光管支架、红外发射管、红外接收管、O型密封圈、基座、螺母C、电线Ⅰ、电线Ⅱ、电线Ⅲ、平垫圈①、连接头；安装组件包括连接弯头、导杆、平垫圈②、螺母A、端子和连接器,光电控制组固定在浮球导杆上,安装组件连接在连接头上。利用液体浮力和浮球重力驱动浮球于浮球导杆内腔做上下限位移动,并通过浮球遮挡或让开红外发射管发出的光线,从而使红外接收管产生相应的低电压或高电压来实现液位检测；采用浮球直接遮挡和让开光线,产生的高低电压相差大,检测信号稳定准确。(The invention belongs to a photoelectric liquid level sensor, which comprises a floating ball component, a photoelectric control component and an installation component; the floating ball assembly comprises a floating ball, a floating ball guide rod, a nut A, a nut B and a filter screen; the photoelectric control assembly comprises a transparent shell, a PCB (printed circuit board), a light pipe bracket, an infrared transmitting tube, an infrared receiving tube, an O-shaped sealing ring, a base, a nut C, a wire I, a wire II, a wire III, a flat washer I and a connector; the mounting assembly comprises a connecting elbow, a guide rod, a flat washer, a nut A, a terminal and a connector, the photoelectric control group is fixed on the floating ball guide rod, and the mounting assembly is connected to the connecting head. The floating ball is driven by liquid buoyancy and floating ball gravity to do up-and-down limiting movement in the inner cavity of the floating ball guide rod, and light rays emitted by the infrared emission tube are shielded or avoided by the floating ball, so that the infrared receiving tube generates corresponding low voltage or high voltage to realize liquid level detection; the floating ball is adopted to directly shield and give way light, the generated high and low voltages have large phase difference, and the detection signal is stable and accurate.)

1. A photoelectric liquid level sensor is characterized by comprising a floating ball component, a photoelectric control component and a mounting component, wherein the floating ball component comprises a floating ball, a floating ball guide rod, a nut A, a nut B and a filter screen; the photoelectric control assembly is fixed on a floating ball guide rod in the floating ball assembly and comprises a transparent shell, a PCB (printed circuit board), a light pipe bracket, an infrared transmitting tube, an infrared receiving tube, an O-shaped sealing ring, a base, a nut C, an electric wire I, an electric wire II, an electric wire III, a flat washer I and a connector; the mounting assembly is connected to the connecting head and comprises a connecting elbow, a guide rod, a flat washer, a nut A, a terminal and a connector.

2. The photoelectric liquid level sensor according to claim 1, wherein the float assembly comprises a float, a float guide, a nut A, a nut B and a filter screen; the floating ball is injection molded into a sphere by adopting polytetrafluoroethylene plastic, so that the surface of the floating ball is not easy to adsorb impurities in the liquid; the floating ball guide rod is formed by injection molding of a transparent PP material, the middle of the floating ball guide rod is provided with round through holes with different sizes, and the 2 end of the floating ball guide rod is provided with an external thread; the inner threads of the nut A and the nut B are matched with the threads of the floating ball guide rod, and the bottom of the nut B is provided with a spigot position; the filter screen is the equipartition small circle footpath through-hole, and the excircle is provided with the tang position.

3. The photoelectric liquid level sensor according to claim 1, wherein the photoelectric control assembly comprises a transparent shell, a PCB (printed circuit board), a light pipe bracket, an infrared transmitting tube, an infrared receiving tube, an O-shaped sealing ring, a base, a nut C, a wire I, a wire II, a wire III, a flat washer I and a connector; the transparent shell is formed by injection molding of a transparent PP material, 2 detection parts are arranged at the bottom, threads are arranged at the upper part, a sealing ring notch is formed in the upper end face, and 2 columns and 2 stop columns for fixing the PCB are arranged in the transparent shell; the O-shaped sealing ring is placed in a sealing ring notch of the transparent shell; the PCB is provided with an infrared transmitting tube, an infrared receiving tube, a wire I, a wire II and a wire III welding hole, the middle of the PCB is provided with 2 round through holes fixed on the transparent shell, the 2 side of the PCB is provided with 4 square holes for fixing the light pipe bracket, and the front end of the PCB is provided with a directional end face; the lower end of the light pipe bracket is provided with a light groove for infrared rays to pass through, and the upper end of the light pipe bracket is provided with 2 buckles; the infrared transmitting tube and the infrared receiving tube are inserted into the light tube bracket and then are fixed in 4 square holes of the PCB by using buckles; the wire I, the wire II and the wire III penetrate through the welding holes of the PCB; an internal thread is arranged in the base and matched with the thread of the transparent shell, an external thread is arranged on an upper cylinder and matched with the thread of the nut C, and a large circular through hole and a small circular through hole are arranged in the cylinder; the nut C is provided with internal threads, and the bottom of the nut C is provided with a spigot position; a circular through hole is formed in the middle of the flat washer I; the front end of the connector is provided with a spigot, and the rear end of the connector is provided with external threads.

4. The photoelectric liquid level sensor according to claim 1, wherein the mounting assembly comprises a connecting elbow, a guide rod, a flat washer, a nut A, a terminal and a connector; the 2 ends of the connecting elbows are provided with internal threads, and the 2 ends form an angle of 90 degrees; the guide rod is formed by injection molding of a PP material, a round through hole is formed in the middle, and external threads are formed at the 2 end of the guide rod; a round through hole is formed in the middle of the flat washer II; the nut A rotates to the guide rod; the terminal is pressed on the electric wire I, the electric wire II and the electric wire III, and the terminal penetrates into the connector.

Technical Field

The invention belongs to a liquid level sensor, and particularly relates to a photoelectric liquid level sensor used in liquid level detection.

Background

The mechanical floating ball liquid level sensor operates by using physical magnetic force, when a detected medium floats on the float, the float drives the magnet to sense the internal reed pipe to output an action signal, and the float floats up and down along with the rising and falling of the liquid level so as to acquire a signal to detect the height of the liquid level of the equipment. Such a liquid level sensor has the following problems.

1. Because the reed switch is packaged by glass, potential damage is easy to occur in the production and manufacturing process, and the quality cannot be well judged; in addition, potential damage to the reed pipe can be caused due to poor protection in the transportation process; therefore, the mechanical float ball liquid level switch is easy to have the bad phenomena of normal opening (the contact of the reed switch is not disconnected) and normal operation sometimes after the normal opening.

2. The dry reed is easily interfered by strong magnetism, so that a detection signal error is caused.

3. After the floating ball with the magnet is soaked in liquid for a long time, the floating ball can adsorb magnetic substances in the liquid, and the phenomena of demagnetization and no magnetism occur, so that a detection signal error is caused.

The photoelectric liquid level sensor on the market at present utilizes the principle that light is reflected and refracted at interfaces of two different media, when a conical end is positioned in air, infrared light is internally reflected back to a photoelectric tube, and the optical coupling characteristic between emission and reception is good. When the sensing end is immersed in liquid, infrared light is transmitted from the conical surface, and the light intensity received by the photoelectric tube is reduced, so that the output level is changed. Such an electro-optical level sensor has the following problems.

1. When water mist or water drops are stuck on the conical end mirror surface, the liquid level sensor mistakenly thinks that the liquid level sensor is immersed in the liquid and generates switch state switching, so that false alarm is caused.

2. Only a fixed point of presence or absence of liquid can be detected.

3. When the liquid level sensor is immersed in liquid, the photoelectric receiving tube can also receive light emitted by the photoelectric emitting tube, so that the generated low voltage is higher.

Disclosure of Invention

In order to solve the above problems in the prior art, an object of the present invention is to provide a photoelectric liquid level sensor, which is used for liquid level detection, can quickly and accurately detect the position of liquid, and has a small external size and simple installation.

In order to achieve the above object, an embodiment of the present invention is a photoelectric liquid level sensor, including: the device comprises a floating ball assembly, a photoelectric control assembly and an installation assembly, wherein the floating ball assembly comprises a floating ball, a floating ball guide rod, a nut A, a nut B and a filter screen; the photoelectric control assembly is fixed on a floating ball guide rod in the floating ball assembly and comprises a transparent shell, a PCB (printed circuit board), a light pipe bracket, an infrared transmitting tube, an infrared receiving tube, an O-shaped sealing ring, a base, a nut C, an electric wire I, an electric wire II, an electric wire III, a flat washer I and a connector; the mounting assembly is connected to the connecting head and comprises a connecting elbow, a guide rod, a flat washer, a nut A, a terminal and a connector.

Furthermore, the photoelectric liquid level sensor comprises a floating ball assembly, a floating ball guide rod, a nut A, a nut B and a filter screen; the floating ball is injection molded into a sphere by adopting polytetrafluoroethylene plastic, so that the surface of the floating ball is not easy to adsorb impurities in the liquid; the floating ball guide rod is formed by injection molding of a transparent PP material, the middle of the floating ball guide rod is provided with round through holes with different sizes, and the 2 end of the floating ball guide rod is provided with an external thread; the inner threads of the nut A and the nut B are matched with the threads of the floating ball guide rod, and the bottom of the nut B is provided with a spigot position; the filter screen is the equipartition small circle footpath through-hole, and the excircle is provided with the tang position.

Further, the photoelectric liquid level sensor comprises a photoelectric control assembly, a photoelectric detection assembly and a control assembly, wherein the photoelectric control assembly comprises a transparent shell, a PCB (printed circuit board), a light pipe bracket, an infrared emission tube, an infrared receiving tube, an O-shaped sealing ring, a base, a nut C, an electric wire I, an electric wire II, an electric wire III, a flat washer I and a connector; the transparent shell is formed by injection molding of a transparent PP material, 2 detection parts are arranged at the bottom, threads are arranged at the upper part, a sealing ring notch is formed in the upper end face, and 2 columns and 2 stop columns for fixing the PCB are arranged in the transparent shell; the O-shaped sealing ring is placed in a sealing ring notch of the transparent shell; the PCB is provided with an infrared transmitting tube, an infrared receiving tube, a wire I, a wire II and a wire III welding hole, the middle of the PCB is provided with 2 round through holes fixed on the transparent shell, the 2 side of the PCB is provided with 4 square holes for fixing the light pipe bracket, and the front end of the PCB is provided with a directional end face; the lower end of the light pipe bracket is provided with a light groove for infrared rays to pass through, and the upper end of the light pipe bracket is provided with 2 buckles; the infrared transmitting tube and the infrared receiving tube are inserted into the light tube bracket and then are fixed in 4 square holes of the PCB by using buckles; the wire I, the wire II and the wire III penetrate through the welding holes of the PCB; an internal thread is arranged in the base and matched with the thread of the transparent shell, an external thread is arranged on an upper cylinder and matched with the thread of the nut C, and a large circular through hole and a small circular through hole are arranged in the cylinder; the nut C is provided with internal threads, and the bottom of the nut C is provided with a spigot position; a circular through hole is formed in the middle of the flat washer I; the front end of the connector is provided with a spigot, and the rear end of the connector is provided with external threads.

Further, the photoelectric liquid level sensor comprises a mounting assembly, a photoelectric liquid level sensor and a control assembly, wherein the mounting assembly comprises a connecting elbow, a guide rod, a flat washer II, a nut A, a terminal and a connector; the 2 ends of the connecting elbows are provided with internal threads, and the 2 ends form an angle of 90 degrees; the guide rod is formed by injection molding of a PP material, a round through hole is formed in the middle, and external threads are formed at the 2 end of the guide rod; a round through hole is formed in the middle of the flat washer II; the nut A rotates to the guide rod; the terminal is pressed on the electric wire I, the electric wire II and the electric wire III, and the terminal penetrates into the connector.

The floating ball type liquid level detection device has the advantages that when the floating ball type liquid level detection device is actually used, the floating ball is driven to move up and down in a limiting manner by utilizing the buoyancy of liquid and the gravity of the floating ball, and light rays emitted by the infrared emission tube are shielded or avoided by the floating ball, so that the infrared receiving tube cannot receive or completely receive the light rays emitted by the infrared emission tube, and the infrared receiving tube generates corresponding low voltage or high voltage to realize liquid level detection; the filter screen is arranged at the end 2 of the floating ball guide rod, so that foreign matters are prevented from entering the inner cavity of the floating ball guide rod, the surface of the floating ball is smooth, and the floating reliability of the floating ball is guaranteed; the action and test component does not contain magnetic materials and is not interfered by strong magnetism; the test element is an infrared light tube and is packaged by plastic resin, so that the production and transportation processes are stable and reliable; the liquid level detection depth is changed conveniently by changing the length of the guide rod; the floating ball is adopted to directly shield and give way light, the difference between the generated high voltage and the generated low voltage is large, and the detection signal is stable and accurate; the modular production is adopted, the appearance size is small, the production is simple, and the efficiency is high; the installation is simple through the threaded installation.

Drawings

FIG. 1 is a cross-sectional view of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

FIG. 3 is a cross-sectional view of the float assembly of the present invention.

Fig. 4 is a cross-sectional view of the photovoltaic control assembly of the present invention.

Fig. 5 is a cross-sectional view of the mounting assembly of the present invention.

FIG. 6 is a schematic view of the float of the present invention.

FIG. 7 is a cross-sectional view of the float guide of the present invention.

Fig. 8 is a cross-sectional view of the nut a of the present invention.

Fig. 9 is a sectional view of the nut B of the present invention.

Fig. 10 is a schematic view of the filter screen of the present invention.

FIG. 11 is a schematic diagram of a PCB board of the present invention.

Fig. 12 is a schematic view of a transparent housing of the present invention.

Fig. 13 is a cross-sectional view of a transparent housing of the present invention.

Fig. 14 is a cross-sectional view of a base of the present invention.

Fig. 15 is a schematic view of an O-ring of the present invention.

Fig. 16 is a cross-sectional view of the nut C of the present invention.

FIG. 17 is a schematic view of a light pipe bracket of the present invention.

Fig. 18 is a schematic view of an infrared emitting tube of the present invention.

Fig. 19 is a schematic view of an infrared receiving tube of the present invention.

Fig. 20 is a schematic view of a flat washer (r) of the present invention.

Fig. 21 is a schematic view of an electric wire i, an electric wire ii, and an electric wire iii according to the present invention.

Fig. 22 is a schematic view of a connecting head according to the present invention.

Figure 23 is a schematic view of a connecting elbow of the present invention.

FIG. 24 is a schematic view of a guide bar of the present invention.

FIG. 25 is a schematic view of a flat washer according to the present invention.

Fig. 26 is a schematic view of a terminal of the present invention.

Fig. 27 is a schematic view of a connector of the present invention.

In the figure, 1 floating ball, 2 floating ball guide rod, 3 nut A, 4 nut B, 5 filter screen, 6 PCB board, 7 transparent shell, 8 base, 9O type sealing ring, 10 nut C, 11 light pipe bracket, 12 infrared emission tube, 13 infrared receiving tube, 14 flat gasket I, 15 connector, 16 electric wire I, 17 electric wire II, 18 electric wire III, 19 connecting elbow, 20 guide rod, 21 flat gasket II, 22 terminal and 23 connector.

Detailed Description

The present invention provides a photoelectric liquid level sensor, and in order to make the objects, technical solutions, and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 27, the invention comprises a floating ball assembly, a photoelectric control assembly and a mounting assembly, wherein the floating ball assembly comprises a floating ball 1, a floating ball guide rod 2, a nut A3, a nut B4 and a filter screen 5; the photoelectric control assembly is fixed on a floating ball guide rod 2 in the floating ball assembly and comprises a transparent shell 7, a PCB 6, a light pipe bracket 11, an infrared transmitting tube 12, an infrared receiving tube 13, an O-shaped sealing ring 9, a base 8, a nut C10, an electric wire I16, an electric wire II 17, an electric wire III 18, a flat washer I14 and a connector 15; the mounting assembly is connected to the connector 15, and the mounting assembly comprises a connecting elbow 19, a guide rod 20, a flat washer 21, a nut A3, a terminal 22 and a connector 23.

As shown in fig. 3 and 6 to 10, further, the float assembly includes a float 1, a float guide 2, a nut a3, a nut B4 and a filter screen 5; the floating ball 1 is made of polytetrafluoroethylene plastic and is molded into a sphere, so that the surface of the floating ball is not easy to adsorb impurities in liquid; the floating ball guide rod 2 is formed by injection molding of a transparent PP material, a round through hole (shown in the figure A) with different sizes is formed in the middle, and an external thread is formed at the end 2; the inner threads of the nut A3 and the nut B4 are matched with the threads of the floating ball guide rod 2, and the bottom of the nut B4 is provided with a spigot position (shown in the figure B); the filter screen 5 is uniformly distributed with small-diameter through holes, and the excircle of the filter screen is provided with a spigot position (shown as a position C), when the filter screen is assembled, the floating ball 1 is poured into the inner cavity from the upper part of the floating ball guide rod 2, the filter screen 5 seals the upper part of the floating ball guide rod 2, and then the filter screen is screwed by a nut B4 in a rotating way; the float guide rod 2 is inserted into the middle circular arc of the 2 detection parts from the transparent shell 7, the nut A3 rotates from the bottom of the float guide rod 2 until the float guide rod is screwed down, the filter screen 5 seals the bottom of the float guide rod 2, and then the nut B4 rotates and screws down.

As shown in fig. 4 and fig. 11 to 22, further, the photoelectric control assembly includes a transparent casing 7, a PCB 6, a light pipe bracket 11, an infrared emission tube 12, an infrared reception tube 13, an O-ring 9, a base 8, a nut C10, a wire i 16, a wire ii 17, a wire iii 18, a flat washer i 14, and a connector 15; the transparent shell 7 is formed by injection molding of a transparent PP material, 2 detection parts are arranged at the bottom, threads are arranged at the upper part, a sealing ring notch is formed in the upper end face, and 2 cylinders and 2 stop columns for fixing the PCB 6 are arranged in the transparent shell; the O-shaped sealing ring 9 is placed in a sealing ring notch of the transparent shell 7; the PCB 6 is provided with an infrared transmitting tube 12, an infrared receiving tube 13, an electric wire I16, an electric wire II 17 and an electric wire III 18 welding hole, the middle part of the PCB is provided with 2 round through holes fixed on the transparent shell 7, the 2 side of the PCB is provided with 4 square holes for fixing the light pipe bracket 11, and the front end of the PCB is provided with a directional end face; the lower end of the light pipe bracket 11 is provided with a light groove for infrared rays to pass through, and the upper end of the light pipe bracket is provided with 2 buckles; the infrared transmitting tube 12 and the infrared receiving tube 13 are inserted into the light pipe bracket 11 and then are fixed in 4 square holes of the PCB 6 by fasteners; the wire I16, the wire II 17 and the wire III 18 penetrate through a welding hole of the PCB 6; an internal thread is arranged in the base 8 and matched with the thread of the transparent shell 7, an external thread is arranged on an upper cylinder and matched with the thread of a nut C10, and a large and small circular through hole (shown in a figure D) is arranged in the cylinder; the nut C10 is provided with internal threads, and the bottom of the nut C10 is provided with a spigot position; a round through hole is formed in the middle of the flat washer I14; the front end of the connector 15 is provided with a spigot, and the rear end of the connector is provided with an external thread; during assembly, the infrared transmitting tube 12 and the infrared receiving tube 13 are inserted into the light pipe bracket 11, the transmitting and receiving heads face to the light grooves of the light pipe bracket 11, the transmitting and receiving heads are fixed in 4 square holes of the PCB 6 by using buckles of the light pipe bracket 11, the electric wire I16, the electric wire II 17 and the electric wire III 18 penetrate through welding holes of the PCB 6, and then the electric wire I16, the electric wire II 17 and the electric wire III are welded well by using electric bar; 2 circular through holes in the middle of the PCB 6 are fixed on 2 cylinders of the transparent shell 7, and the directional end face arranged at the front end faces to the 2 stop columns of the transparent shell 7; the O-shaped sealing ring 9 is placed in a sealing ring notch of the transparent shell 7; the base 8 is matched with the transparent shell 7 through threads, and the rotary base 8 is screwed with the transparent shell 7; there is the circular through-hole in the middle of flat washer (14), and a terminal surface is placed the upper portion cylinder end face of base 8, and another terminal surface is placed the tang terminal surface of connector 15 front end, nut C10 is provided with the internal thread, and the bottom is provided with the tang position, nut C10 tang position backward toward the rear end external screw thread department screw in of connector 15, with the rotatory tightening of base 8 upper portion cylinder external screw thread.

As shown in fig. 5 and fig. 23 to 27, further, the mounting assembly includes a connecting elbow 19, a guide rod 20, a flat washer (21), a nut a3, a terminal 22 and a connector 23; the 2 end of the connecting elbow 19 is provided with internal threads, the 2 end forms a 90-degree angle, one end of the connecting elbow is connected with the connector 15, and the other end of the connecting elbow is connected with the guide rod 20; the guide rod 20 is formed by injection molding of a PP material, a round through hole is formed in the middle, an external thread is formed at the end 2, and the bottom end of the guide rod 20 penetrates into the electric wire I16, the electric wire II 17 and the electric wire III 18; the terminal 22 is pressed on the electric wire I16, the electric wire II 17 and the electric wire III 18; a round through hole is formed in the middle of the flat washer II 21, the flat washer II penetrates through the upper part of the guide rod 20 to reach a hexagonal platform, and then the nut A3 rotates to the guide rod; the connector 23 is internally penetrated by the terminal 22; the product is then assembled.

When the infrared transmitting tube 13 is actually used, the floating ball 1 is driven by liquid buoyancy and floating ball gravity to move up and down in the inner cavity of the floating ball guide rod 2 in a limiting manner, when liquid does not reach the floating ball 1, the floating ball 1 is at the lower limit of the floating ball guide rod 2, and light rays emitted by the infrared transmitting tube 12 are shielded by the floating ball 1, so that the infrared receiving tube 13 cannot receive the light rays emitted by the infrared transmitting tube 12, and the infrared receiving tube 13 generates corresponding low voltage which is less than 0.1V; when liquid exceeds the floating ball 1, the floating ball 1 is positioned at the upper limit of the floating ball guide rod 2, the floating ball 1 lets the infrared emission tube 12 emit light, so that the infrared emission tube 13 completely receives the light emitted by the infrared emission tube 12, the infrared emission tube 13 generates corresponding high voltage which is larger than 4.6V (VCC = 5V), when the liquid level is reduced, the floating ball 1 moves to the lower limit of the inner cavity of the floating ball guide rod by utilizing self gravity, and low voltage or high voltage is generated back and forth to realize liquid level detection; the end 2 of the floating ball guide rod 2 is provided with the filter screen 5, so that foreign matters are prevented from entering the inner cavity of the floating ball guide rod 2, the surface of the floating ball 1 is smooth, and the floating reliability of the floating ball 1 is guaranteed; the action and test component does not contain magnetic materials and is not interfered by strong magnetism; the test element is an infrared light tube and is packaged by plastic resin, so that the production and transportation processes are stable and reliable; the liquid level detection depth is changed conveniently by changing the length of the guide rod 20; the floating ball 1 is adopted to directly shield and give way light, the difference between the generated high voltage and the generated low voltage is large, and the detection signal is stable and accurate; the modular production is adopted, the appearance size is small, the production is simple, and the efficiency is high; the installation is simple through the threaded installation.

In the positional relationship description of the present invention, the appearance of terms such as "inner", "outer", "upper", "lower", "front", "rear", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings is merely for convenience of describing the embodiments and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operation, and thus, is not to be construed as limiting the present invention.

The foregoing summary and structure are provided to explain the principles, general features, and advantages of the product and to enable others skilled in the art to understand the invention. The foregoing examples and description have been presented to illustrate the principles of the invention and are intended to provide various changes and modifications within the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.