Radar level transmitter

Abstract

The utility model discloses radar type liquid level transmitter relates to radar type liquid level transmitter field, the utility model discloses a flange, the top of flange is installed with liquid level meter body, and the bottom of liquid level meter body is installed with antenna, the inner wall of antenna is provided with a plurality of flow guide grooves, and the inner wall of antenna and the inner wall of flow guide groove all have PTFE coating that sprays. The utility model discloses through being provided with PTFE coating and flow guide groove, when radar wave reaches the oil sludge / sewage liquid level and reflects, owing to the inner wall of antenna spraying PTFE coating, viscous oil sludge can not adhere, condensed water is along flow guide groove and is discharged quickly, avoids the reflection wave to be shielded or produces false echo, avoids condensed water or oil sludge and is attached in the inner wall of antenna and causes greater measurement error, and then improves measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of radar-type liquid level transmitters, specifically radar-type liquid level transmitters. Background Technology

[0002] Radar-type level transmitters are core intelligent level measurement and control instruments in oil sludge resource recovery and cleaning systems. They are mainly used to monitor the liquid level in key equipment such as demulsification reactors, sludge storage tanks, chemical conditioning reactors, and electrocatalytic oxidation devices in real time. By outputting standard signals, they realize liquid level data transmission, interlocking control, and alarm functions to ensure the safe and stable operation of the system.

[0003] Existing radar level transmitters and radar level gauges have antennas that directly contact oil sludge and steam condensate. The viscous oil sludge easily forms a "signal-blocking layer" on the inner wall of the antenna, and the condensate easily accumulates to form a "water film" or "liquid accumulation area." Both can cause abnormal radar wave reflection. The "signal-blocking layer" formed by the oil sludge prevents the radar wave from reaching the true liquid level, resulting in a measured value that is lower than the actual value (e.g., an actual liquid level of 2.5m, but a measured value of only 1.0m). The "false echoes" generated by the accumulation of condensate can cause the system to misjudge the liquid level (e.g., liquid reflection causing a display of 0.3m). False liquid levels can directly lead to pump shutdowns due to low liquid levels: the actual liquid level in the demulsification reactor is normal (1.0m), but the measured value shows 0.4m (below the interlock threshold of 0.5m), causing the system to stop the booster pump, resulting in material interruption in the reaction section and interruption of the sludge treatment process. Furthermore, false alarms / leakage alarms due to high liquid levels can also occur. For example, the actual liquid level in the sludge storage tank may reach 3.2m (exceeding the safety threshold of 3.0m), but the signal may be blocked, causing the measured value to show 2.8m. The system will not alarm, and the sludge will overflow, causing equipment corrosion and ground pollution. Treating the pollution requires additional manpower and resources. At the same time, the sludge feed rate and reagent dosage are both adjusted based on liquid level data. Distorted data can lead to excessive feed or insufficient reagent, resulting in a decrease in the sludge treatment pass rate. Unqualified sludge needs to be reworked, significantly increasing operating costs. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a radar-type liquid level transmitter to solve the technical problem that oil sludge and steam condensate can easily form a signal blocking layer on the inner wall of the antenna.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a radar-type liquid level transmitter, including a flange, a liquid level gauge body is installed on the top of the flange, and an antenna is installed on the bottom of the liquid level gauge body. Multiple flow guide grooves are opened on the inner wall of the antenna, and the inner wall of the antenna and the inner wall of the flow guide grooves are coated with PTFE coating.

[0006] By adopting the above technical solution, the flange serves as the connection carrier between the radar level gauge and core equipment such as the demulsification reactor and sludge storage tank, and provides stable support for the radar level gauge and antenna.

[0007] Furthermore, a sealing gasket is installed at the bottom of the flange, and the sealing gasket is made of fluororubber material.

[0008] By adopting the above technical solutions, the sealing gasket enhances the sealing performance of the flange and equipment interface, prevents oil sludge and sewage leakage, and blocks the leakage of flammable and explosive VOCs gases, making it suitable for explosion-proof working conditions.

[0009] Furthermore, a signal processing unit is installed inside the level gauge body.

[0010] By adopting the above technical solution, the signal processing unit can receive the radar echo signal from the antenna, convert it into digital liquid level data, convert the digital signal into a 4-20mA standard electrical signal, and superimpose the HART protocol to realize "signal transmission and parameter interaction".

[0011] Furthermore, the level gauge body is equipped with two wiring ports.

[0012] By adopting the above technical solution, the connection port can be connected to a 24V DC power supply to power the equipment; it outputs a 4-20mA+HART standard signal to realize the remote transmission of liquid level data to the DCS.

[0013] Furthermore, the top of the flange is provided with multiple mounting holes, and bolts are installed in the mounting holes.

[0014] By adopting the above technical solution, it is ensured that the level gauge body is accurately connected to the flange interface of equipment such as demulsifiers and sludge storage tanks.

[0015] Furthermore, the antenna is made of 316L material and is horn-shaped.

[0016] By adopting the above technical solution, the antenna emits high-frequency radar waves (such as 80GHz) that penetrate the VOCs gas phase space to reach the oil sludge / sewage level; and receives the echo signal reflected by the liquid level, which is the "detection core" of the measurement; at the same time, the 316L material is resistant to oil sludge corrosion, has a horn-shaped focused radar wave, and is resistant to gas phase interference.

[0017] Furthermore, the depth of the guide groove is 0.5-1mm, and the width of the guide groove is 3-4mm.

[0018] By adopting the above technical solution, the flow channel can guide condensate and residual sludge to flow out quickly from the inner wall of the antenna, avoiding accumulation inside the antenna. Moreover, the size of the flow channel is much smaller than the radar wave wavelength, so it does not affect the directional propagation of the beam.

[0019] Furthermore, the thickness of the PTFE coating is 0.15-0.2 mm, and the PTFE coating is achieved using an electrostatic spraying and high-temperature curing process.

[0020] By adopting the above technical solution, the non-stick properties of PTFE can reduce the adhesion of viscous sludge and oil, avoid the formation of a signal blocking layer, and accelerate the sliding of condensate water, thus preventing water film from interfering with radar wave propagation.

[0021] Furthermore, a sealing cap is installed on the top of the level gauge body via fastening bolts.

[0022] By adopting the above technical solution, the sealing cover can seal the top of the level gauge body, protect the internal signal processing unit, and prevent dust and condensate from entering.

[0023] Furthermore, a transparent plate is installed on the top of the sealing cover, and the transparent plate is made of borosilicate tempered glass.

[0024] By adopting the above technical solutions, transparent panels made of borosilicate tempered glass material are impact-resistant, temperature-resistant (withstand 70±5℃), and resistant to VOCs vapor phase corrosion, meeting explosion-proof safety requirements.

[0025] In summary, the present invention has the following main advantages: 1. This utility model, by setting a PTFE coating and a flow channel, reflects radar waves when they reach the oil sludge / sewage level. Because the inner wall of the antenna is sprayed with a PTFE coating, the viscous oil sludge cannot adhere, and the condensate is quickly discharged along the flow channel, which avoids the reflected wave being blocked or generating false echoes, and avoids the condensate or oil sludge adhering to the inner wall of the antenna, thus preventing large measurement errors and improving measurement accuracy. 2. This utility model features a sealing gasket made of fluororubber, which enhances the sealing performance between the flange and the equipment interface, preventing the leakage of oil sludge and sewage, while also blocking the leakage of flammable and explosive VOCs gases, making it suitable for explosion-proof conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the overall bottom view of the present invention; Figure 3 This is a schematic diagram of the overall orthographic structure of this utility model; Figure 4 This is a schematic diagram of the liquid level gauge body structure of this utility model; Figure 5 For the present utility model Figure 2 A magnified structural diagram of point A in the middle.

[0027] In the diagram: 1. Flange; 2. Mounting hole; 3. Level gauge body; 4. Signal processing unit; 5. Wiring port; 6. Antenna; 7. PTFE coating; 8. Flow guide groove; 9. Sealing gasket; 10. Sealing cover; 11. Transparent plate. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The embodiments of this utility model will be described below based on its overall structure.

[0030] Example 1: Radar-type level transmitters, such as Figures 1-5 As shown, the system includes a flange 1, a level gauge body 3 mounted on top of the flange 1, and an antenna 6 mounted on the bottom of the level gauge body 3. Multiple guide grooves 8 are formed on the inner wall of the antenna 6. Both the inner wall of the antenna 6 and the inner wall of the guide grooves 8 are coated with a PTFE coating 7. The flange 1 serves as the connection carrier between the radar level gauge and core equipment such as the demulsification reactor and sludge storage tank, and provides stable support for the radar level gauge and antenna 6. Multiple mounting holes 2 are formed on the top of the flange 1, and bolts are installed in the mounting holes 2 to ensure precise connection between the level gauge body 3 and the flange interfaces of equipment such as the demulsification reactor and sludge storage tank. The antenna 6 is made of 316L material and is horn-shaped. The antenna 6 emits high-frequency radar waves (such as 80GHz), penetrating the VOCs gas phase space to reach the sludge / sewage level; it also receives the echo signal reflected from the liquid level, serving as the "detection core" for measurement. Simultaneously, the 316L material is resistant to sludge corrosion, and the horn-shaped design focuses the radar waves, resisting gas phase interference.

[0031] See Figures 1-5 The depth of the flow channel 8 is 0.5-1mm and the width of the flow channel 8 is 3-4mm. The flow channel 8 can guide condensate and residual sludge to flow out quickly from the inner wall of the antenna 6, avoiding accumulation inside the antenna. Moreover, the size of the flow channel 8 is much smaller than the radar wave wavelength, so it does not affect the directional propagation of the beam. The thickness of the PTFE coating 7 is 0.15-0.2mm. The PTFE coating 7 is achieved by the "electrostatic spraying and high temperature curing" process. The non-stick properties of PTFE reduce the adhesion of viscous sludge and oil, avoid the formation of a signal blocking layer, and accelerate the sliding of condensate, avoiding water film interference with radar wave propagation.

[0032] See Figures 1-3The liquid level gauge body 3 is internally equipped with a signal processing unit 4. This unit receives radar echo signals from the antenna, converts them into digital liquid level data, and then converts the digital signal into a 4-20mA standard electrical signal. It also incorporates the HART protocol to achieve signal transmission and parameter interaction. The liquid level gauge body 3 has two connection ports 5, which can be explosion-proof glands. These ports can be connected to a 24V DC power supply to power the device and output a 4-20mA+HART standard signal for remote transmission of liquid level data to a DCS (Distributed Control System). Example 2: Based on the above embodiment 1, in order to improve the sealing between flange 1 and equipment interface, the following structure will be set.

[0033] Specifically, a sealing gasket 9 is installed at the bottom of flange 1. The sealing gasket 9 is made of fluororubber material. The sealing gasket 9 enhances the sealing performance between flange 1 and equipment interface, prevents oil sludge and sewage leakage, and blocks the leakage of VOCs flammable and explosive gases, making it suitable for explosion-proof conditions.

[0034] Example 3: Based on the above embodiment 1, the following structure is provided to seal the top of the level gauge body 3.

[0035] Specifically, a sealing cover 10 is installed on the top of the level gauge body 3 by fastening bolts. The sealing cover 10 can seal the top of the level gauge body 3, protect the internal signal processing unit, and prevent dust and condensate from entering. A transparent plate 11 is installed on the top of the sealing cover 10. The transparent plate 11 is made of borosilicate tempered glass. The transparent plate 11 made of borosilicate tempered glass is impact-resistant, temperature-resistant (withstands 70±5℃), and resistant to VOCs gas phase corrosion, meeting the explosion-proof safety requirements.

[0036] The working principle of this utility model is as follows: First, the operator fixes the level gauge to the top flange interface of the core equipment such as the demulsification reactor and sludge storage tank through the mounting holes 2 and bolts on the flange 1. The sealing gasket 9 seals the interface to prevent leakage of sludge and VOCs. Then, the cable is connected to the wiring port 5. After the signal processing unit 4 inside the level gauge body 3 is powered, it controls the antenna 6 to emit high-frequency radar waves (such as 80GHz). The horn-shaped antenna 6 directs and focuses the radar waves, penetrating the gas phase space (VOCs environment) and propagating towards the sludge / sludge level. The radar waves reach the sludge / sludge level. When the sewage level is reflected, the viscous sludge cannot adhere to the inner wall of the antenna 6 due to the PTFE coating 7 sprayed on it. The condensate is quickly discharged from the inner wall of the antenna 6 along the guide channel 8, avoiding the reflection wave being blocked or generating false echoes. The antenna 6 receives the reflected echo signal and transmits it to the signal processing unit 4. The chip in the unit filters interference signals, calculates real-time liquid level data, and then converts the digital signal into a 4-20mA standard electrical signal through a DAC converter. The signal is superimposed with the HART protocol (which supports remote adjustment of the range and alarm threshold). The 4-20mA+HART signal is transmitted to the DCS system through the wiring port 5 via a cable. The system realizes equipment interlock control according to preset logic (such as stopping the pump when the liquid level is low at 0.5m and alarming when the liquid level is high at 3.0m).

[0037] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A radar-type liquid level transmitter, comprising a flange (1), characterized in that: The top of the flange (1) is equipped with a level gauge body (3), and the bottom of the level gauge body (3) is equipped with an antenna (6). The inner wall of the antenna (6) has multiple guide grooves (8), and the inner wall of the antenna (6) and the inner wall of the guide grooves (8) are coated with PTFE coating (7).

2. The radar-type liquid level transmitter according to claim 1, characterized in that: A sealing gasket (9) is installed at the bottom of the flange (1), and the sealing gasket (9) is made of fluororubber material.

3. The radar-type liquid level transmitter according to claim 1, characterized in that: The liquid level gauge body (3) is equipped with a signal processing unit (4).

4. The radar-type liquid level transmitter according to claim 1, characterized in that: The liquid level gauge body (3) is equipped with two wiring ports (5).

5. The radar-type liquid level transmitter according to claim 1, characterized in that: The flange (1) has multiple mounting holes (2) on its top, and bolts are installed in the mounting holes (2).

6. The radar-type liquid level transmitter according to claim 1, characterized in that: The antenna (6) is made of 316L material and is arranged in a horn shape.

7. The radar-type liquid level transmitter according to claim 1, characterized in that: The depth of the guide groove (8) is 0.5-1mm, and the width of the guide groove (8) is 3-4mm.

8. The radar-type liquid level transmitter according to claim 1, characterized in that: The thickness of the PTFE coating (7) is 0.15-0.2 mm, and the PTFE coating (7) is achieved by electrostatic spraying and high temperature curing.

9. The radar-type liquid level transmitter according to claim 1, characterized in that: The top of the level gauge body (3) is fitted with a sealing cap (10) by fastening bolts.

10. The radar-type liquid level transmitter according to claim 9, characterized in that: The top of the sealing cover (10) is fitted with a transparent plate (11), and the transparent plate (11) is made of borosilicate tempered glass.

Images