Radar level meter

Abstract

Relates to the field of radar level meters, and discloses a radar level meter which comprises a radar level meter body, a blowing mechanism is arranged at the bottom of the radar level meter body, a heat insulation protection mechanism is arranged at the bottom of the blowing mechanism, and a flange connecting piece is arranged at the bottom of the heat insulation protection mechanism. The heat insulation protection mechanism comprises a thin-wall copper pipe, and a first hollow ring is fixedly installed on the outer wall of the thin-wall copper pipe. Through the overall design of the heat insulation protection mechanism, flowing air can be conveyed into an inner cavity of the branch pipe, and meanwhile air can be selectively refrigerated through the thermoelectric refrigerating unit; and low-temperature air exchanges heat with air in the inner cavity of the thin-wall copper pipe through the branch pipe and the thin-wall copper pipe, so that the temperature in the inner cavity of the thin-wall copper pipe is reduced, the problem that the radar level meter main body is easily damaged by high temperature in the measured tank body is avoided, and the service life of the radar level meter main body is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of radar level gauge technology, specifically a radar level gauge. Background Technology

[0002] A radar level gauge is an instrument used to measure the level of liquids, slurries, and other materials. It employs a microwave pulse measurement method and can operate normally within the industrial frequency band. Characterized by low beam energy, it can be installed in various metal and non-metal containers or pipes to achieve non-contact, continuous measurement of liquids, slurries, and granular materials.

[0003] The existing equipment has the following disadvantages: radar level gauges measure the height of materials by emitting microwave signals. If the temperature of the material inside the tank being measured is high, the working environment of the radar level gauge will be in a high-temperature state, which may damage the radar level gauge and affect its service life.

[0004] Therefore, this application proposes a radar level gauge to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a radar level gauge to solve the problem that the radar level gauge is easily damaged when working in a high-temperature environment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a radar level gauge, comprising a radar level gauge body, a purging mechanism at the bottom of the radar level gauge body, a heat insulation protection mechanism at the bottom of the purging mechanism, and a flange connector at the bottom of the heat insulation protection mechanism.

[0007] The heat insulation protection mechanism includes a thin-walled copper tube. A first hollow ring is fixedly installed on the outer wall of the thin-walled copper tube. A second hollow ring located below the first hollow ring is fixedly installed on the outer wall of the thin-walled copper tube. A branch pipe is fixedly connected between adjacent sides of the first and second hollow rings. The branch pipe is fixedly connected to the outer wall of the thin-walled copper tube. A connecting pipe is fixedly connected to the right side of the first hollow ring. A hollow plate is fixedly connected to the end of the connecting pipe away from the first hollow ring. A duct fan is fixedly connected to the top of the hollow plate.

[0008] A thermoelectric cooler is fixedly installed on the top of the hollow plate, and a support leg is fixedly installed on the bottom of the hollow plate. The support leg is fixedly installed on the right side of the second hollow ring.

[0009] The second hollow ring is fixedly connected to the left side of the air outlet pipe, and the bottom of the thin-walled copper pipe is fixedly connected to the flange connector.

[0010] The purging mechanism includes a square tube, which is fixedly installed at the bottom of the radar level gauge body, and the bottom of the square tube is fixedly connected to the top of the thin-walled copper tube.

[0011] The square tube has an exhaust hole on its left side, and a conical plug is movably inserted into the inner cavity of the exhaust hole. A valve is fixedly connected to the right side of the square tube, and an air source pipe is fixedly connected to the right side of the valve.

[0012] A connecting frame is fixedly installed on the left side of the square tube, a gate is slidably connected to the inner wall of the connecting frame, a positioning bolt is threadedly connected to the top of the connecting frame, and the threaded end of the positioning bolt is movably connected to the top of the gate.

[0013] The radar level gauge body has a display programming module on its top. The display programming module is used to adjust the operating parameters of the radar level gauge body and to view the echo curve of the echo situation inside the tank being measured.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention, through the overall design of the heat insulation protection mechanism, can deliver flowing air into the inner cavity of the branch pipe, and can selectively cool the air through a thermoelectric cooler. The low-temperature air exchanges heat with the air inside the thin-walled copper tube through the branch pipe and the thin-walled copper tube, reducing the temperature inside the thin-walled copper tube. This avoids the problem of high temperature inside the measured tank easily causing damage to the radar level gauge body, thus extending the service life of the radar level gauge body. Through the overall design of the purging mechanism, it is convenient for workers to clean the detection end of the radar level gauge body with compressed air or nitrogen, further extending the service life of the radar level gauge body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the separation structure of the thin-walled copper tube and the square tube in one embodiment of the present invention;

[0018] Figure 3 This is a cross-sectional view of the square tube in one embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the heat insulation protection mechanism in one embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram showing the installation position of the radar level gauge body in one embodiment of the present invention.

[0021] In the diagram: 1. Radar level gauge body; 11. Flange connector; 2. Purge mechanism; 21. Square tube; 22. Exhaust port; 23. Conical plug; 24. Valve; 25. Gas source pipe; 26. Connecting frame; 27. Positioning bolt; 28. Gate; 3. Thermal insulation protection mechanism; 31. Thin-walled copper tube; 32. Hollow ring No. 1; 33. Branch pipe; 34. Hollow ring No. 2; 35. Gas outlet pipe; 36. Connecting pipe; 37. Support leg; 38. Hollow plate; 381. Thermoelectric cooler; 382. Pipe fan. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 This utility model provides a technical solution: a radar level gauge, including a radar level gauge body 1, model ISD426-BT80D1 LMS. The radar level gauge body 1 is powered by a two-wire DC24V power supply and has a 4-20mA / HART output. The power supply and output current signal of the radar level gauge body 1 share a single two-core cable. If electromagnetic interference exists, a shielded cable is used. The antenna of the radar level gauge body 1 is set to PTFE + quartz glass for heat insulation. The direct transmission angle to the level gauge body 1 is set to 2.5 degrees, the accuracy is ±2mm, the blind zone is 0.1 meters, and the range is 0-30 meters. A purging mechanism 2 is set at the bottom of the radar level gauge body 1, and a heat insulation protection mechanism 3 is set at the bottom of the purging mechanism 2. The heat insulation protection mechanism 3 includes a thin-walled copper pipe 31 with a flange connection 11. A first hollow ring 32 is fixedly installed on the outer wall of the thin-walled copper pipe 31. A second hollow ring 34 located below the first hollow ring 32 is fixedly installed on the outer wall of the thin-walled copper pipe 31. A branch pipe 33 is fixedly connected between the adjacent sides of the first hollow ring 32 and the second hollow ring 34. The branch pipe 33 is fixedly connected to the outer wall of the thin-walled copper pipe 31. A connecting pipe 36 is fixedly connected to the right side of the first hollow ring 32. A hollow plate 38 is fixedly connected to the end of the connecting pipe 36 away from the first hollow ring 32. A duct fan 382 is fixedly connected to the top of the hollow plate 38.

[0024] It should be noted that during operation, this structure is installed on the top of the tank being measured. The radar level gauge body 1 emits electromagnetic waves from the tank top. These waves are reflected by the medium and received by the radar level gauge body 1. The frequency difference δf between the received and transmitted signals is proportional to the distance R from the medium surface: R = C (velocity) * δf (frequency difference) / 2 / K (modulation slope). Since the speed of light C and the modulation slope K are known, the frequency difference δf can be estimated to obtain the distance R from the material surface at the installation position of the radar level gauge body 1. Then, using the known total height of the tank, the distance R from the radar level gauge body 1 can be calculated. The spatial distance from the material surface is referred to as the air height. The height of the material level is obtained by controlling the operation of the pipeline fan 382, ​​which can deliver air into the inner cavity of the hollow plate 38. The air then flows through the inner cavities of the connecting pipe 36, the first hollow ring 32, the branch pipe 33, the second hollow ring 34, and the air outlet pipe 35. The air will exchange heat with the air in the inner cavity of the thin-walled copper pipe 31 through the branch pipe 33 and the thin-walled copper pipe 31, thereby reducing the temperature in the inner cavity of the thin-walled copper pipe 31. This avoids the problem that the high temperature inside the measured tank can easily cause damage to the radar level gauge body 1, and extends the service life of the radar level gauge body 1.

[0025] In one embodiment, a thermoelectric cooler 381 is fixedly installed on the top of the hollow plate 38, a support leg 37 is fixedly installed on the bottom of the hollow plate 38, the support leg 37 is fixedly installed on the right side of the second hollow ring 34, an air outlet pipe 35 is fixedly connected to the left side of the second hollow ring 34, and a flange connector 11 is fixedly connected to the bottom of the thin-walled copper pipe 31.

[0026] This design is for reference. Figure 4 The hollow plate 38 is supported by the support leg 37 to improve its stability. If the internal temperature of the tank is too high and the ambient air cannot be cooled sufficiently, the thermoelectric cooler 381 is controlled to cool down. The air flowing inside the hollow plate 38 is cooled down by the hollow plate 38, which improves the heat insulation protection of the radar level gauge body 1. The flange connector 11 is designed so that this structure can be installed on the tank by flange connection.

[0027] In one embodiment, the purging mechanism 2 includes a square tube 21, which is fixedly installed at the bottom of the radar level gauge body 1. The bottom of the square tube 21 is fixedly connected to the top of the thin-walled copper tube 31. An exhaust port 22 is provided on the left side of the square tube 21, and a conical plug 23 is movably inserted into the inner cavity of the exhaust port 22. A valve 24 is fixedly connected to the right side of the square tube 21, and a gas source pipe 25 is fixedly connected to the right side of the valve 24. A connecting frame 26 is fixedly installed on the left side of the square tube 21, and a gate plate 28 is slidably connected to the inner wall of the connecting frame 26. A positioning bolt 27 is threadedly connected to the top of the connecting frame 26, and the threaded end of the positioning bolt 27 is movably connected to the top of the gate plate 28. A display programming module is provided on the top of the radar level gauge body 1. The display programming module is used to adjust the working parameters of the radar level gauge body 1 and to view the echo curve of the echo situation in the measured tank.

[0028] This design is for reference. Figure 3 The actual length of the gas source pipe 25 is designed according to the usage environment. The end of the gas source pipe 25 is connected to an external compressed gas source or nitrogen source. Loosen the positioning bolt 27, and then slide the gate 28 in the inner cavity of the connecting frame 26. The gate 28 seals the bottom of the inner cavity of the square tube 21. Then remove the cone plug 23, and then open the control valve 24. The external gas source flows through the inner cavity of the square tube 21 to clean the detection end of the radar level gauge body 1. After cleaning, reset the gate 28 and then tighten the positioning bolt 27.

[0029] In one embodiment, the radar level gauge body 1 is mounted on top of the tank being measured.

[0030] This design is for reference. Figure 5 During installation, the radar level gauge body 1 should be installed at the installation point. There should be no obstacles within a 20cm radius to ensure the normal operation of the radar level gauge body 1.

[0031] Furthermore, if the embodiments involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relation to the specification. The significance or implied number of the indicated technical features is not specified. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

Claims

1. A radar level gauge comprising a radar level gauge body (1), characterized in that The bottom of the radar level gauge body (1) is provided with a blowing mechanism (2), the bottom of the blowing mechanism (2) is provided with a heat insulation protection mechanism (3), and the bottom of the heat insulation protection mechanism (3) is provided with a flange connector (11); The heat insulation protection mechanism (3) comprises a thin-walled copper pipe (31), a first hollow ring (32) is fixedly installed on the outer wall of the thin-walled copper pipe (31), a second hollow ring (34) is fixedly installed below the first hollow ring (32) on the outer wall of the thin-walled copper pipe (31), a branch pipe (33) is fixedly connected between the adjacent sides of the first hollow ring (32) and the second hollow ring (34), the branch pipe (33) is fixedly connected to the outer wall of the thin-walled copper pipe (31), a connecting pipe (36) is fixedly connected to the right side of the first hollow ring (32), a hollow plate (38) is fixedly connected to the end of the connecting pipe (36) away from the first hollow ring (32), and a pipeline fan (382) is fixedly connected to the top of the hollow plate (38).

2. A radar level gauge according to claim 1, characterized in that: The top of the hollow plate (38) is fixedly installed with a thermoelectric refrigerator (381), the bottom of the hollow plate (38) is fixedly installed with a supporting leg (37), and the supporting leg (37) is fixedly installed on the right side of the second hollow ring (34).

3. A radar level gauge according to claim 1, characterized in that: The left side of the second hollow ring (34) is fixedly connected with an air outlet pipe (35), and the bottom of the thin-walled copper pipe (31) is fixedly connected with the flange connector (11).

4. A radar level gauge according to claim 1, characterized in that: The bottom of the radar level gauge body (1) is provided with a blowing mechanism (2), the bottom of the blowing mechanism (2) is provided with a heat insulation protection mechanism (3), and the bottom of the heat insulation protection mechanism (3) is provided with a flange connector (11); 5. A radar level gauge according to claim 4, characterized in that: The left side of the first hollow ring (32) is fixedly installed with a connecting frame (26), the inner wall of the connecting frame (26) is slidably connected with a shutter (28), the top of the connecting frame (26) is threadedly connected with a positioning bolt (27), and the threaded end of the positioning bolt (27) is movably connected with the top of the shutter (28).

6. A radar level gauge according to claim 5, characterized in that: The top of the radar level gauge body (1) is provided with a display programming module, the display programming module is used for adjusting the working parameters of the radar level gauge body (1), and the display programming module is used for checking the echo curve of the echo of the measured tank.

7. A radar level gauge according to claim 1, characterized in that: ​

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