Millimeter wave chemical liquid level detection sensor

Abstract

The utility model discloses a millimeter wave chemical liquid level detection sensor, and aims to solve the technical problems of corrosion prevention, accurate liquid level detection, convenience in installation and cost reduction. According to the technical scheme, a circuit main board is arranged in a shell, a millimeter wave lens is arranged at the bottom in the shell, the circuit main board is arranged on the millimeter wave lens in a connected mode, the circuit main board extends out of the shell through a Teflon wire, and the shell is arranged in a sealed mode. Compared with the prior art, the millimeter wave lens and the circuit mainboard are arranged in the shell, the shell is waterproof, dustproof and high in air tightness, corrosive gas is prevented from permeating into the sensor to cause corrosion of the circuit mainboard, corrosion resistance is achieved, the problem of liquid pollution is avoided, influences of floating objects or precipitates of chemical liquid are avoided, and the service life of the sensor is prolonged. The utility model has the advantages of simple structure, low cost and high reliability, is not influenced by environmental factors such as temperature, color, light and the like, and is easy to install by utilizing the external thread and the nut without opening holes.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sensor in the field of chemical industry, in particular to a sensor for detecting liquid level. BACKGROUND

[0002] In chemical production, many liquid raw materials, intermediate products and finished products have dangerous characteristics such as corrosion, toxicity or flammability. Accurate liquid level detection can prevent accidents such as liquid leakage and overflow. Chemical production is a continuous process, and accurate control of the liquid level of liquid raw materials and intermediate products is crucial to ensure the smooth progress of the reaction. Accurate liquid level control can ensure the correct proportion of reaction materials, thereby ensuring the quality and yield of chemical products. Real-time monitoring of the liquid level can also help optimize the production process, improve production efficiency and reduce raw material waste.

[0003] Chemical companies need to manage the inventory of a large number of liquid raw materials, intermediate products and finished products. Liquid level detection sensors can provide real-time liquid level information in containers such as storage tanks, allowing companies to accurately monitor inventory. This is of great significance for arranging production plans and scheduling transportation activities.

[0004] The existing liquid level detection methods mainly include the following:

[0005] Floating ball detection: This is a mechanical principle-based liquid level detection scheme that detects liquid level changes by the up and down movement of a floating ball.

[0006] Capacitive measurement: This measurement method uses the basic principle of capacitance to measure the liquid level based on the change in capacitance value caused by the change in liquid surface or bulk material height.

[0007] Photoelectric refraction measurement: The sensor emits a light source inside, and detects the decrease in the amount of light reflected back to detect the liquid surface.

[0008] Ultrasonic measurement: A non-contact detection method that uses the time difference between ultrasonic transmission and reflection to calculate the liquid level.

[0009] Millimeter wave measurement: A non-contact detection method that emits millimeter waves from a signal source, and when the millimeter waves encounter the liquid surface, they are reflected back to the signal source. The time it takes to calculate the height of the liquid surface is combined with the speed of light.

[0010] The prior art detection method has the following disadvantages: 1. The sensor is inconvenient to install, needs to be opened, and is complex to install; 2. The detection is easily affected by environmental factors such as temperature, color and light, reducing the detection accuracy; 3. The detection component contacts the liquid, is corroded and has the risk of contaminating the liquid; 4. The detection component is immersed in the chemical liquid and is easily corroded by the liquid, needs to be replaced frequently, resulting in high cost; 5. The detection component shell structure is not resistant to corrosion and is not suitable for corrosive chemical scenes; 6. The detection component is installed at the bottom of the container and is easily affected by floating objects or precipitates in the liquid.

[0011] The floating ball type detection is a mechanical detection, needs to contact the measured liquid, and in a complex chemical environment, the floating ball is easily affected by impurities and corrosion, resulting in increased measurement error and even failure.

[0012] The capacitive measurement result is easily affected by medium temperature, pressure fluctuation and container material, needs to be immersed in the solution, the detection component is easily corroded, needs to be replaced frequently, and has the risk of contaminating the solution after being corroded.

[0013] The infrared distance measurement and laser distance measurement have high requirements for the working environment and are easily affected by light and color.

[0014] The ultrasonic wave measurement has the advantage of non-contact measurement, does not directly contact the measured liquid, avoids the risk of corrosion and contamination, and is suitable for liquid level detection of various corrosive and toxic dangerous liquids. However, it needs to be installed at the bottom of the container and measures the liquid surface from the bottom, and if the solution has precipitates, the measurement will be affected. SUMMARY

[0015] The utility model discloses a millimeter wave chemical liquid level detection sensor, and the technical problems of anti-corrosion, accurate liquid level detection, convenient installation and cost reduction are solved.

[0016] The utility model discloses the following technical scheme: a kind of millimeter wave chemical liquid level detection sensor, circuit mainboard is equipped in shell, the bottom of shell is equipped with millimeter wave lens, circuit mainboard is connected and is arranged on millimeter wave lens, circuit mainboard is stretched out outside shell by iron fluorine long line, shell is sealed arrangement.

[0017] The shell of the utility model is composed of a shell main body and a rear cover, the shell main body is in the shape of a cylinder with an open upper end, the external threads at the upper part are detachably connected with the internal threads of the rear cover, and the connecting end surface of the rear cover and the shell main body is provided with a first waterproof ring.

[0018] The rear cover of the utility model is provided with a waterproof joint, and the iron fluorine long line passes through the waterproof joint along the axial direction of the waterproof joint.

[0019] The utility model discloses a circuit mainboard, and the epoxy resin pouring seal glue is poured on the hole of waterproof joint.

[0020] The utility model discloses a waterproof joint hole of the rear cover, and the epoxy resin pouring seal glue is poured.

[0021] The utility model discloses a shell main part cylindrical middle part vertical axis section appearance is positive octagonal, and the outer thread is matched with the nut and is connected.

[0022] The utility model discloses a shell main part inner bottom is provided with millimeter wave lens.

[0023] The utility model discloses a shell main part inner bottom is provided with millimeter wave lens.

[0024] The utility model discloses a shell main part inner bottom is provided with millimeter wave lens.

[0025] The utility model discloses a shell main part inner bottom is provided with millimeter wave lens.

[0026] Compared with the prior art, the millimeter wave lens and the circuit mainboard are arranged in the shell, the Teflon wire is connected with the circuit mainboard, the circuit mainboard is isolated from the outside, the shell is waterproof, dustproof and high in air tightness, corrosion of the circuit mainboard caused by penetration of corrosive gas into the sensor is avoided, the millimeter wave lens is used to make the millimeter wave signal penetrate the PP material with a thickness of 1-15 mm, the shell and the waterproof joint are made of the PP material with corrosion resistance, the connecting wire is made of the Teflon wire material with corrosion resistance, the shell has the advantages of corrosion resistance, the problem of contaminated liquid is avoided, the shell is not affected by floating matter or sediment of the chemical liquid, the shell is not affected by environmental factors such as temperature, color and light, the shell is high in precision, the shell is installed by using the external thread and the nut, the shell is simple, does not need to be holed, is low in cost and high in reliability. DRAWINGS

[0027] Figure 1 It is the installation schematic view of the utility model embodiment.

[0028] Figure 2 It is the structure sectional view of the utility model embodiment.

[0029] Figure 3 It is the structure exploded schematic view of the utility model embodiment.

[0030] Figure 4 It is the circuit structure block diagram of the utility model.

[0031] Figure 5It is the overall appearance diagram of the embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail in connection with the drawings and embodiments.

[0033] As Figure 1 The utility model discloses millimeter wave chemical liquid level detection sensor (sensor) 100 is installed at the top of chemical liquid barrel, is located in the vicinity of liquid inlet 200, and the millimeter wave that sensor sends out can penetrate 1 ~ 15mm plastic plate 400, and the liquid level of chemical liquid 300 is detected from top to bottom.

[0034] As Figure 2 And Figure 3 The utility model discloses sensor, be equipped with Teflon wire 1, waterproof joint 2, first waterproof ring 3, second waterproof ring 4, shell main part 5, epoxy resin filling sealant 6, 704 silicone rubber 7, circuit mainboard 8, nut 9, millimeter wave lens 10, back cover 11 and screw 12.

[0035] Shell main part 5 adopts polypropylene PP material, and the appearance is the cylindrical shape of the open upper end portion, and the cross section appearance of the vertical axis in the cylindrical shape middle part is the regular octagon, and the upper part of the octagon is the external thread, is used for with nut 9 cooperation and is connected, with sensor is fixed on the top surface of chemical liquid barrel.

[0036] Millimeter wave lens 10 is set in the inner bottom of shell main part 5, and millimeter wave lens 10 is the Fresnel lens, and the Fresnel lens is closely combined with the bottom in the shell main part 5 through the inner wall buckle position set in the shell main part 5, and it looks annular ladder on the axial cross section, and there are 4 ladders, and the height of each ladder from the inner bottom of shell main part 5 is respectively 1.54mm of first ladder, 3.62mm of second ladder, 5.7mm of third ladder and 7.78mm of fourth ladder, and the total height of the Fresnel lens is 7.78mm, and it is used for millimeter wave signal focusing, signal amplification, improves the measuring range and the plastic plate thickness of penetration, and the Fresnel lens is equipped with circuit mainboard 8, and adopts screw 12 and is fixedly connected on the Fresnel lens.

[0037] Circuit mainboard 8 is located on the Fresnel lens, and the circuit is arranged on the mainboard, and the circuit is equipped with: anti-static circuit, communication circuit, processor, millimeter wave radar circuit and power supply voltage stabilizing circuit.

[0038] Anti-static circuit is used to protect the processor and prevent static from flowing into the processor. The anti-static circuit of the prior art is used.

[0039] The communication circuit completes the communication between the sensor and the external device. The communication circuit of the prior art is used.

[0040] The processor completes instruction issuing, signal collecting, signal processing, signal outputting, and the processor device has a dedicated millimeter wave ranging processing system for processing the signals returned by the circuits to realize stable chemical liquid level detection. The processor and the system thereof adopt the processor and the system of the prior art.

[0041] The millimeter wave radar circuit completes signal processing between the processor and the millimeter wave radar. The millimeter wave radar circuit of the prior art is adopted.

[0042] The power supply stabilizing circuit completes processing of external power supply input and power supply to internal circuits. The power supply stabilizing circuit of the prior art is adopted.

[0043] The Teflon wire 1 is welded and connected to one end of the circuit mainboard 8, and the other end of the Teflon wire 1 extends out of the shell body 5 and the rear cover 11 to form a shell. The Teflon wire 1 is used for communication between the circuit mainboard 8 and external equipment.

[0044] On the circuit mainboard 8, 704 silicone rubber 7 is used for pouring to prevent the epoxy resin pouring glue 6 from leaking onto the millimeter wave lens 10.

[0045] The 704 silicone rubber is poured with the epoxy resin pouring glue 6 for waterproofing of the circuit mainboard 8 and enhancing the tension of the Teflon wire 1.

[0046] The outer thread on the upper part of the shell body 5 is detachably threadedly connected with the inner thread of the PP material rear cover 11. The connecting end surface of the rear cover 11 and the shell body 5 is provided with the first waterproof ring 3 for waterproofing of the connecting part of the rear cover 11 and the shell body 5.

[0047] The waterproof joint 2 made of PP material is arranged on the rear cover 11 for waterproofing of the sensor overall structure and the Teflon wire 1.

[0048] The second waterproof ring 4 is arranged between the shell body 5 and the nut 9 for connection buffering.

[0049] The sensor of the utility model is assembled in the following order:

[0050] 1. The millimeter wave lens 10 is installed into the bottommost part of the shell body 5.

[0051] 2. The first waterproof ring 3 is arranged in the waterproof ring mounting groove on the outer edge of the rear cover 11.

[0052] 3. The waterproof joint 2 is installed into the rear cover 11.

[0053] 4. The Teflon wire 1 is passed through the waterproof joint 2 along the axial direction of the waterproof joint 2.

[0054] 5. One end of the Teflon wire 1 is welded and connected to the wiring port of the circuit mainboard 8.

[0055] 6. Align the circuit board 8 to the corresponding position of the millimeter wave lens 10, and tighten with screws 12.

[0056] 7. Pour 704 silicone rubber 7 on the circuit board 8 with a thickness of 3mm, and then buckle the back cover 11 to the shell body 5, and air dry at room temperature for 12 hours.

[0057] 8. Pour epoxy resin pouring glue 6 at the hole of the waterproof joint 2 on the back cover 11, until the hole of the back cover 11 is filled with glue, and air dry at room temperature for 12 hours.

[0058] 9. Place the second waterproof ring 4 in the waterproof ring mounting groove on the outer edge of the shell body 5, and screw the nut 9 by half, thus completing the assembly of the entire sensor.

[0059] The sensor of the utility model is installed on the top of the chemical liquid barrel, and the millimeter wave signal penetrates the plastic shell body 5 to detect the liquid level of the chemical liquid 300 from top to bottom, and the working process is:

[0060] (1) The sensor is powered on to supply power to each circuit.

[0061] (2) The processor starts initialization to ensure that each circuit works normally.

[0062] (3) The processor sends instructions to the millimeter wave radar circuit.

[0063] (4) The millimeter wave radar circuit emits millimeter wave signals.

[0064] (5) The millimeter wave radar circuit waits to receive the returned millimeter wave signals.

[0065] (6) The millimeter wave radar circuit returns the received signals to the processor.

[0066] (7) The processor returns the signal to screen the target echo.

[0067] (8) The processor calculates the distance value (s=v*t / 2) according to the time of the target echo combined with the speed of light.

[0068] (9) The processor compares and processes the calculated distance value and the nearest data.

[0069] (10) The processor transmits the processed data to the client through the connection line.

[0070] The utility model adopts the combination of the shell body 5 and the back cover 11 to form the shell of the sensor, and utilizes the waterproof joint 2, the first waterproof ring 3, the epoxy resin pouring glue 6 and the 704 silicone rubber 7 to seal the shell, so that the sensor is sealed from corrosion, and is suitable for harsh scenes of chemical liquid level detection.

[0071] The shell body 5 cooperates with the nut 9 to fix the sensor on the top surface of the chemical liquid barrel, and installation is unnecessary to open a hole, and measurement is unnecessary to contact the measured liquid, so that liquid corrosion or pollution of the sensor measuring part is avoided.

[0072] The millimeter wave lens 10 arranged in the shell body 5 enables millimeter wave signals to penetrate the 1-15 mm polypropylene PP plastic plate of the shell body 5.

[0073] The functional part millimeter wave lens 10 and the circuit mainboard 8 are arranged in the shell, and are connected with the circuit mainboard through the Teflon wire 1.

[0074] The utility model uses non-contact distance measurement, the sensor whole machine has good dustproof and waterproof effect, is resistant to strong acid and strong alkali gas corrosion, and the protection level can reach IP67.

[0075] The utility model discloses a range 300cm, angle 12 °, blind area minimum 6cm, is specially designed for chemical liquid level detection, and measurement stability is high, precision is high, is resistant to corrosion, satisfies the demand of chemical liquid level detection.

[0076] The utility model discloses the circuit mainboard 8 is arranged on the millimeter wave lens 10, and the occupied volume is small. When the user needs to integrate the sensor into other equipment, can only integrate the millimeter wave lens 10 with the circuit mainboard 8 into other equipment, when the user does not need to integrate the sensor into other equipment, can use the sensor whole machine and connect through the cable and other equipment.

[0077] The utility model discloses simple structure, small volume, when installing, only need to utilize the threaded column (outer thread) of sensor shell body 5 and the nut 9 and screw up and press in the surface of the jar, install after connecting other equipment normal output data line. The operation is simple in later period maintenance, and the learning cost of installation and maintenance is reduced.

[0078] The utility model discloses the sensor adopts non-contact liquid level measurement technology, is installed on the surface of chemical liquid barrel, does not need to open a hole and destroy the jar, and millimeter wave signals can directly penetrate the plastic shell and measure the distance between the sensor and the liquid surface from top to bottom. When the sensor detects the liquid surface, the distance value of the liquid surface is transmitted back to the host computer, and the host computer can obtain the current liquid level height in the chemical liquid barrel according to the distance value returned by the sensor. The problem that the sensor directly contacts the chemical solution and may cause solution pollution is solved. The problem that the detection part of the contact sensor needs to be immersed in the chemical solution and is corroded by the solution, and the detection part needs to be replaced frequently is also solved. The polypropylene PP material is used as the shell, which has good corrosion resistance, and the problem that the sensor is corroded by corrosive gas in a chemical environment and has a short service life is solved.

Claims

1. A millimeter wave chemical liquid level detection sensor, a circuit mainboard (8) is arranged in the shell, characterized in that: The inner bottom of the shell is provided with a millimeter wave lens (10), the circuit mainboard (8) is connected to the millimeter wave lens (10), the circuit mainboard (8) extends out of the shell through a Teflon wire (1), and the shell is in a sealed arrangement.

2. The millimeter wave chemical liquid level detection sensor according to claim 1, characterized by: The shell is composed of a shell body (5) and a rear cover (11), the shell body (5) is in a cylindrical shape with an open upper end, an outer thread at the upper part is detachably connected to an inner thread of the rear cover (11), and a first waterproof ring (3) is arranged on the connecting end surface of the rear cover (11) and the shell body (5).

3. The millimeter wave chemical liquid level detection sensor according to claim 2, characterized by: The rear cover (11) is provided with a waterproof joint (2), and the Teflon wire (1) passes through the waterproof joint (2) along the axial direction of the waterproof joint (2).

4. The millimeter wave chemical liquid level detection sensor according to claim 3, characterized by: The circuit mainboard (8) is filled with 704 silicone rubber (7), and the 704 silicone rubber (7) is filled with epoxy resin filling glue (6).

5. The millimeter wave chemical liquid level detection sensor according to claim 4, characterized by: The rear cover (11) is filled with epoxy resin filling glue (6) in the hole of the waterproof joint (2).

6. The millimeter wave chemical liquid level detection sensor according to claim 5, characterized by: The cross section of the vertical axis of the cylindrical middle part of the shell body (5) is in a regular octagonal shape, and the upper part of the octagonal shape is an outer thread connected with a nut (9).

7. The millimeter wave chemical liquid level detection sensor according to claim 6, characterized by: The inner bottom of the shell body (5) is provided with a millimeter wave lens (10).

8. The millimeter wave chemical liquid level detection sensor according to claim 7, characterized by: The millimeter wave lens (10) is a Fresnel lens.

9. The millimeter wave chemical liquid level detection sensor according to claim 8, characterized by: The axial cross section of the Fresnel lens is in a ring-shaped stepped shape, and there are four steps, and the height of each step from the inner bottom surface of the shell body (5) is 1.54mm for the first step, 3.62mm for the second step, 5.7mm for the third step, and 7.78mm for the fourth step, and the total height of the Fresnel lens is 7.78mm.

10. The millimeter wave chemical liquid level detection sensor according to claim 9, characterized by: The shell body (5), the rear cover (11) and the waterproof joint (2) are made of polypropylene (PP) material.

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