Liquid level detection device

Abstract

The utility model discloses a liquid level detection device, which belongs to the technical field of liquid level detection and comprises a box body, a cavity is arranged in the box body, a liquid inlet pipe communicated with the cavity is fixedly arranged at the bottom of the box body, and a reflective floater in clearance fit with the cavity is slidably mounted in the cavity. A photoelectric detection head capable of sealing the cavity is mounted at the top of the box body, and an LED light source capable of emitting a light source towards the top wall of the reflective floater and a photosensitive sensor capable of receiving reflected light of the top wall of the reflective floater are arranged on the photoelectric detection head. According to the liquid level detection device, only one photoelectric detection head needs to be arranged, the liquid level height is judged through reflected light, the cost is reduced, the detection precision is improved, the size is small, and the liquid level precision can reach 0.5 mm.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid level detection, and particularly relates to a liquid level detection device. Background Art

[0002] With the popularization of industrial automation control technology, more and more scenarios require the introduction of technical means to automatically and accurately read the liquid level.

[0003] In the prior art, a Chinese patent with the publication number CN205843770U discloses a liquid level detection device. A light-blocking float is arranged between an infrared transmitting device and an infrared receiving device. By detecting the output signal of the infrared receiving LED, information about the liquid level height can be obtained. However, in the above technology, the liquid level is detected by light blocking, and multiple groups of infrared light-emitting units need to be longitudinally installed in the detection pipeline, increasing the cost. Moreover, due to the gap between adjacent two groups of infrared light-emitting units, when the light-blocking float rises and the liquid surface is between adjacent two groups of infrared light-emitting units, it is difficult to accurately detect the liquid level height.

[0004] Therefore, it is necessary to propose a liquid level detection device to solve the above problems. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a liquid level detection device, which is used to solve the problems of poor detection accuracy and high cost in the prior art when detecting the liquid level.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a liquid level detection device, which includes a box body. A cavity is arranged inside the box body. A liquid inlet pipe communicated with the cavity is fixedly arranged at the bottom of the box body. A reflective float that is slidably installed in the cavity and has a clearance fit with the cavity is arranged inside the cavity. An optoelectronic detection head capable of closing the cavity is installed at the top of the box body. An LED light source capable of emitting light towards the top wall of the reflective float and a photosensitive sensor capable of receiving the reflected light from the top wall of the reflective float are arranged on the optoelectronic detection head.

[0008] Further, a notch is arranged on the side of the reflective float close to the liquid inlet pipe. The height of the notch is greater than the distance between the top end of the liquid inlet pipe and the bottom of the cavity, so that the liquid can be injected into the notch through the liquid inlet pipe.

[0009] Further, a float cavity is arranged inside the reflective float.

[0010] Further, an exhaust port communicated with the cavity is arranged on the side wall close to the top of the box body.

[0011] Further, a liquid discharge hole communicated with the cavity is arranged at the bottom of the box body.

[0012] Furthermore, a cover plate is detachably installed on the box body. A data processing circuit placement cavity matching with the top of the box body is arranged in the cover plate. The top of the box body is inserted into the data processing circuit placement cavity, and the data processing circuit placement cavity can enclose the data processing circuit on the photoelectric detection head.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The present utility model only needs to set one photoelectric detection head, uses the reflected light to judge the liquid level height, reduces the cost, improves the detection accuracy, achieves a small volume, and the liquid level accuracy can reach 0.5 mm.

[0015] Other advantages, objectives and features of the present utility model will be described in the following specification, and to some extent will be obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the objectives, technical solutions and beneficial effects of the present utility model clearer, the following drawings are provided for the present utility model for illustration:

[0017] Figure 1 It is a cross-sectional view of the overall structure installation state of the embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure of the embodiment of the present utility model;

[0019] Figure 3 It is a schematic diagram of the reflective float structure of the embodiment of the present utility model.

[0020] The reference signs in the drawings are as follows: box body 1, cavity 101, liquid inlet pipe 102, exhaust port 103, drain hole 104, reflective float 2, notch 201, float cavity 202, photoelectric detection head 3, LED light source 301, photosensitive sensor 302, cover plate 4, data processing circuit placement cavity 401. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figures 1 to 3 shown, the present utility model provides a liquid level detection device, including: a box body 1, a cavity 101 is arranged in the box body 1, a liquid inlet pipe 102 communicating with the cavity 101 is fixedly arranged at the bottom of the box body 1, a reflective float 2 that is slidably installed in the cavity 101 and has a clearance fit with the cavity 101 is arranged in the cavity 101, a photoelectric detection head 3 capable of closing the cavity 101 is installed at the top of the box body 1, and an LED light source 301 and a photosensitive sensor 302 are arranged on the photoelectric detection head 3.

[0022] In this solution, the photoelectric detection head 3 is embedded in the top of the box body 1. After injecting liquid into the cavity 101 through the liquid inlet pipe 102, the reflective float 2 floats on the liquid surface. According to the floating height of the reflective float 2, the light source generated by the LED light source 301 on the photoelectric detection head 3 irradiates the reflective surface of the reflective float 2. The reflective float 2 reflects light of different intensities to the photosensor 302 according to the floating height, and the liquid level height is detected according to the intensity of the light sensed by the photosensor 302. After the photosensor 302 detects the data, it is sent to the MCU (single-chip microcomputer), and then the variable data of the liquid level is finally obtained through the sampling of the internal AD detection circuit of the MCU and the program operation, and the data interaction is carried out with the external hardware through the UART communication interface; among them, the data interface of the photoelectric detection head 3 is a 4-wire interface, and the working voltage is DC-5V.

[0023] In this solution, only one photoelectric detection head 3 needs to be set, and the liquid level height is judged by using the reflected light, which reduces the cost, achieves a small volume, improves the detection accuracy, and the liquid level accuracy can reach 0.5 mm.

[0024] In an embodiment of the present invention, a notch 201 is provided on the side of the reflective float 2 close to the liquid inlet pipe 102, and the height of the notch 201 is greater than the distance between the top end of the liquid inlet pipe 102 and the bottom of the cavity 101.

[0025] In this solution, when no liquid is injected into the cavity 101, the reflective float 2 freely falls to the bottom of the cavity 101. When injecting liquid into the cavity 101 through the liquid inlet pipe 102, the liquid first enters the notch 201 so that the reflective float 2 can float, avoiding the reflective float 2 from blocking the liquid from entering the cavity 101.

[0026] In an embodiment of the present invention, a float cavity 202 is provided inside the reflective float 2.

[0027] In this solution, by setting the float cavity 202, while ensuring the height of the side wall of the reflective float 2, the weight of the reflective float 2 is reduced to ensure the buoyancy of the reflective float 2.

[0028] In an embodiment of the present invention, an exhaust port 103 communicating with the cavity 101 is provided on the side wall close to the top of the box body 1.

[0029] In this solution, by setting the exhaust port 103, the external air is communicated with the cavity 101 to play a pressure relief role after injecting liquid into the cavity 101. When the rising height of the liquid exceeds the height of the exhaust port 103, the liquid can flow out along the exhaust port 103, avoiding damage to the photoelectric detection head 3 when the liquid injection amount exceeds the preset amount.

[0030] In an embodiment of the present utility model, a liquid discharge hole 104 communicating with the cavity 101 is provided at the bottom of the box body 1. When injecting liquid into the cavity 101, the liquid discharge hole 104 is blocked by a rubber plug. When liquid discharge is required, the rubber plug is opened to facilitate the discharge of the liquid in the cavity 101 through the liquid discharge hole 104.

[0031] In an embodiment of the present utility model, a cover plate 4 is detachably mounted on the box body 1. A data processing circuit placement cavity 401 matching with the top of the box body 1 is provided in the cover plate 4. The top of the box body 1 is inserted into the data processing circuit placement cavity 401 to achieve the detachable connection between the box body 1 and the cover plate 4, and at the same time, the data processing circuit on the photoelectric detection head 3 is enclosed to play a protective role.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit. Although the present utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present utility model.

Claims

1. A liquid level detection device, comprising a box, characterized in that: A cavity is provided in the box body, a liquid inlet pipe connected to the cavity is fixedly provided at the bottom of the box body, a reflective float is slidably installed in the cavity and cooperates with the gap of the cavity, a photoelectric detection head capable of closing the cavity is installed on the top of the box body, and the photoelectric detection head is provided with an LED light source capable of emitting light toward the top wall of the reflective float and a photosensitive sensor capable of receiving reflected light from the top wall of the reflective float.

2. The liquid level detection device according to claim 1, characterized in that: The reflective float is provided with a notch near the liquid inlet pipe, and the height of the notch is greater than the distance between the top of the liquid inlet pipe and the bottom of the cavity, so that liquid can be injected into the notch through the liquid inlet pipe.

3. The liquid level detection device according to claim 2, characterized in that: A float cavity is arranged in the reflective float.

4. The liquid level detection device according to claim 3, characterized in that: An exhaust port communicating with the cavity is arranged on the side wall close to the top of the box body.

5. The liquid level detection device according to claim 4, characterized in that: The bottom of the box body is provided with a drainage hole communicated with the cavity.

6. The liquid level detection device according to claim 5, characterized in that: The box body is provided with a cover plate detachably mounted thereon, wherein a data processing circuit placement cavity cooperating with the box body top is arranged in the cover plate, and the box body top is plugged into the data processing circuit placement cavity, and the data processing circuit placement cavity can seal the data processing circuit on the photoelectric detection head.

Images