CN210346834U - Radiation-resistant guided wave radar liquid level meter - Google Patents
Radiation-resistant guided wave radar liquid level meter Download PDFInfo
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- CN210346834U CN210346834U CN201921314679.6U CN201921314679U CN210346834U CN 210346834 U CN210346834 U CN 210346834U CN 201921314679 U CN201921314679 U CN 201921314679U CN 210346834 U CN210346834 U CN 210346834U
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Abstract
The utility model provides a radiation-resistant guided wave radar liquid level meter, which comprises a meter head positioned at the far end, a guided wave head assembled together and a guided wave structure; the gauge outfit comprises a processor, and a signal transmitting unit and a signal receiving unit which are respectively connected with the processor, wherein a signal amplifying unit is connected between the signal receiving unit and the processor; a radio frequency connector is arranged in the waveguide head, is used for connecting a radio frequency cable and is communicated with a signal transmitting unit and a signal receiving unit of the gauge head; the guide wave structure comprises a metal sleeve, the top of the metal sleeve is fixedly connected through a flange, a guide wave rod or a cable is arranged in the metal sleeve, one end of the guide wave rod or the cable penetrates through the flange to be connected with the radio frequency connector, and the other end of the guide wave rod or the cable is fixed at the bottom of the metal sleeve. The utility model provides a guided wave radar level gauge can tolerate the problem of bulk dose nuclear radiation, further promoted echo signal's intensity, can be used to measure low dielectric constant's liquid.
Description
Technical Field
The utility model relates to a reliable measurement technical field of nuclear safety liquid level, concretely relates to radiation-resistant guided wave radar level gauge of liquid level measurement technique.
Background
The radar level gauge is a level measuring instrument in industry, can measure the level of liquid, particles and slurry continuously, and the measurement is not affected by temperature change, inert gas, steam, dust, foam, etc. Wherein, guided wave radar level gauge's theory of operation does: the pulse signal output by the instrument propagates along the guide wave rod of the guide wave radar liquid level meter, when the pulse signal propagates to the contact position of the guide wave rod and the liquid level, an echo signal is generated at the liquid level because the characteristic impedance of the pulse signal changes, and then the instrument obtains the liquid level of the measured medium by calculating the time difference of transmitting the pulse signal and the echo signal.
Patent CN207147588U discloses a prevent crystallization guided wave radar level gauge, its technical scheme main points are including the gauge outfit, guided wave pole and connect gauge outfit and guided wave pole's sealed connector, and its theory of operation is by a bundle of electromagnetic wave of gauge outfit transmission, and the electromagnetic wave propagates downwards along metal guided wave pole with the light velocity, and partial electromagnetic wave is reflected back to the gauge outfit when meetting the measured object matter, through measuring the time that the electromagnetic wave launches and returns, calculates out the liquid level height. The wave guide rod comprises a steel cable, a heavy hammer is fixed at the free end of the steel cable, and a metal floating platform is arranged on the steel cable. The outstanding advantage of this patent is that inlay between the base with the signal conduction pole is equipped with the insulation support pipe. Through the heat preservation sleeve pipe that is made by polytetrafluoroethylene that the structural seal set up, the conduction of electromagnetic wave is no longer influenced at gauge outfit and sealed connector to the crystallization thing of crystallization at gauge outfit and sealed connector department, ensures liquid level measurement's normal clear.
However, this patent has the following disadvantages:
the heat-insulating sleeve arranged outside the wave guide rod at the meter head and the sealing connector is made of polytetrafluoroethylene materials, the materials are hard and fragile non-metallic materials, the nuclear radiation resistance is not high, the risk of foreign matters falling into a storage tank or a water pool exists when the heat-insulating sleeve is used on site, and a large number of nuclear radiation areas exist in a nuclear power station and the like, so that the heat-insulating sleeve cannot be normally used;
the liquid level measuring instrument can only play a role in that crystals at the meter head and the sealing connector do not influence liquid level measurement, if the range change of liquid to be measured is large, the crystallization can not be prevented when the crystals are on the lower wave guide rod, if the crystals are near the metal floating platform, the liquid level can change to a large extent again, and if the crystals can not be dissolved again, the metal floating platform is clamped, so that the liquid with low dielectric constant can not be measured;
the electromagnetic wave transmitting and receiving, the electromagnetic wave transmitting and receiving time measuring and the liquid level height calculating are all completed in the gauge head, so that the gauge head contains signal processing electronic devices which cannot be normally used in areas with a large amount of nuclear radiation.
Patent CN204535816U discloses a guided wave radar level gauge, and it includes level gauge main part, guided wave pole, mounting flange, protective case, guided wave pole mount, concentric reducing pipe and protective case mount, especially relates to the guided wave radar level gauge of the interior solid-liquid mixture liquid level of the agitating unit of measurement tape agitator. The liquid level is measured by using the guided wave radar liquid level meter installed in the protective sleeve, the accuracy of the real-time liquid level measurement is ensured, the operation influence of the stirrer is avoided, the false liquid level is effectively avoided, and the continuous normal operation of the process production is ensured; the guided wave radar level gauge is maintained, the medium in the equipment does not need to be emptied, and the guided wave radar level gauge is easy to maintain.
This patent has the following disadvantages:
a sleeve fixing frame and a concentric reducing pipe need to be installed in devices such as a storage tank and the like needing to measure liquid level in advance, and the device can only be suitable for new construction, and cannot be installed for devices such as a storage tank and the like which store liquid which cannot be emptied;
the guide wave rod fixing frame is made of non-metal and high-temperature-resistant materials such as ceramics, the side end face of the guide wave rod fixing frame is in sliding contact with the inner wall of the protective sleeve, once the sleeve shakes or vibrates during transportation, installation or operation, if the sleeve is made of ceramics, the sleeve is easy to break when being collided, and the risk that foreign matters fall off exists, and the performance of other non-metal materials in nuclear radiation, corrosion and boric acid solution can be greatly reduced, so that the guide wave rod fixing frame is not suitable for measuring the boric acid water level of nuclear radiation of a nuclear power station;
the liquid level meter main body is completely arranged at the top of a device such as a storage tank and the like needing to measure the liquid level, the liquid level meter main body internally contains signal processing electronic devices, and the devices cannot be normally used in an area with a large amount of nuclear radiation.
Patent CN103674170A discloses a guided wave radar level gauge, this level gauge includes: the device comprises a signal transmitting unit, a signal amplifying unit, a signal receiving unit and a processor. The working principle is as follows: the pulse signal output by the meter propagates along the waveguide rod of the guided wave radar level gauge. When the pulse signal is transmitted to the contact position of the wave guide rod and the liquid level, the characteristic impedance of the pulse signal changes, an echo signal is generated at the liquid level, and the instrument calculates the time difference between the transmitted pulse signal and the echo signal, so that the liquid level of the measured medium is obtained. The signal amplification unit amplifies echo signals with different amplitudes by different times. Like this, the echo signal after signal amplification unit enlargies more is favorable to the discernment of treater to improved the detection range of guided wave radar level gauge, this patent provides a solution to the difficult problem that little dielectric constant liquid echo signal is weak difficult for discerning.
This patent has the following disadvantages:
the device mainly comprises a signal amplification unit capable of being automatically selected, focuses on a signal processing part of a guided wave radar liquid level meter, and does not describe the composition structure and the measurement performance of the guided wave radar;
the singlechip, the memory, the amplifying circuit, the filter circuit and the like related to the patent are all electronic devices and cannot tolerate high-dose nuclear radiation.
The patent does not provide a relevant description of a split guided wave radar level gauge.
As described above, the above-mentioned patent publication cannot be applied to a nuclear power plant or the like having a large number of nuclear radiation regions, measurement accuracy is easily affected by crystals or the like, and structural design strength is not sufficient and is easily damaged.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a main aim at provides a guided wave radar level gauge of radioresistance, through making split type structure with guided wave radar level gauge and optimizing the guided wave structure, has solved guided wave radar level gauge and can tolerate the problem of the nuclear radiation of bulk dose, simultaneously, owing to optimized the guided wave structure, and then further promoted echo signal's intensity, can be used to measure low dielectric constant's liquid.
The technical scheme adopted by the utility model is that the anti-radiation guided wave radar liquid level meter comprises a meter head positioned at the far end, a guided wave head assembled together and a guided wave structure;
the gauge outfit comprises a processor, and a signal transmitting unit and a signal receiving unit which are respectively connected with the processor, wherein a signal amplifying unit is connected between the signal receiving unit and the processor;
a radio frequency connector is arranged in the waveguide head, is used for connecting a radio frequency cable with a low attenuation coefficient, and is communicated with a signal transmitting unit and a signal receiving unit of the gauge outfit;
the guide wave structure comprises a metal sleeve, the top of the metal sleeve is fixedly connected through a flange, a guide wave rod or a cable is arranged in the metal sleeve, one end of the guide wave rod or the cable penetrates through the flange to be connected with the radio frequency connector, and the other end of the guide wave rod or the cable is fixed at the bottom of the metal sleeve.
By last, through installing the gauge outfit that contains electron device such as treater, signal emission unit, signal receiving unit in the non-nuclear radiation's of distal end place, radio frequency cable through low attenuation coefficient is connected with gauge outfit and the guided wave structure that is located nuclear radiation place, make the gauge outfit avoid radiation, the corruption influence, simultaneously, metal sleeve is adopted to the outside of guided wave structure, can tolerate large dose nuclear radiation and corruption, this metal sleeve combines guided wave pole or cable, still can strengthen echo signal, with the liquid of measuring low dielectric constant, can also guarantee structural strength simultaneously, be difficult to damaged by the collision, be applicable to in the complicated measuring environment.
Further improve, still include guided wave structure mount, include:
the main part, main part middle part have be used for the card to be surveyed jar body or pond top edge down recess, and the one end that the main part was kept away from the surveyed jar body or pond has counter weight portion, and the one end that the main part stretches into jar body or pond has the through-hole of a level setting, and this through-hole can pass metal sleeve, and the butt joint the ring flange.
The improved structure is characterized in that the middle of the main body of the guided wave structure fixing frame is also provided with a wire slot arranged at the top of the main body, and one part of the radio frequency cable is arranged in the wire slot.
By last, when measuring the jar body or the pond of being surveyed of measuring the liquid level to needs, need stretch into jar body or pond with the guided wave structure from the top of being surveyed jar body or pond, wherein the guided wave structure swings easily in jar body or pond, can't keep vertically motionless state, consequently, through the one end joint that makes guided wave structure frame main part at jar body or pond top edge, the other end sets up the through-hole and cup joints the guided wave structure, can also hold in the palm the ring flange simultaneously, make the guided wave structure keep vertically motionless in jar body or pond.
The improved structure is characterized in that the bottom of the metal sleeve is also provided with a limiting locking structure for straightening and locking the wave guide rod or the cable, and the limiting locking structure comprises a limiting hole for the wave guide rod or the cable to stretch and a self-locking nut for straightening the rod or the cable.
Therefore, the guided wave rod or the cable is possibly bent in the metal sleeve, and after the guided wave medium passes through the limiting hole at the bottom of the metal sleeve to be straightened, the limiting hole and the guided wave rod or the cable are locked by the self-locking nut, so that the guided wave medium is in a state of being vertical to the liquid level in the metal sleeve, and the measurement precision is ensured.
In a further improvement, the gauge head further comprises a display unit connected with the processor.
Therefore, the display unit is used for displaying the liquid level information of the measured liquid.
The wave guide head, the wave guide structure and the wave guide structure fixing frame are made of high-temperature-resistant, corrosion-resistant and radiation-resistant metal materials.
By last, to being located harsh environment such as high temperature and high humidity, radiation, need adopt high temperature resistant, corrosion-resistant and resistant material in order to guarantee life and measurement accuracy, adopt metal material can guarantee the intensity of this guided wave radar level gauge simultaneously, avoid the collision to cause the damage, influence measurement accuracy.
Drawings
FIG. 1 is a schematic diagram of the principle of the radiation-resistant guided wave radar level gauge of the present invention;
fig. 2 is a schematic structural view of the guided wave structure fixing frame of the present invention;
fig. 3 is a circuit block diagram of an electronic component in the gauge head of the present invention;
fig. 4 is a schematic structural diagram of a guided wave structure according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a guided wave structure according to another embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the guided wave radar level gauge with radiation resistance according to the present invention with reference to the accompanying drawings 1-5.
Fig. 1 shows in the schematic diagram of the guided wave radar level gauge of the present invention, the guided wave radar level gauge includes a gauge outfit 100, a guided wave head 300, and a guided wave structure 400, wherein the gauge outfit 100 is connected to the guided wave head 300 through a low attenuation rf cable 200, the guided wave head 300 is connected to the guided wave structure 400 through a flange 500, and the guided wave head can be sealed by a high sealing level case, thereby realizing a complete guided wave radar level gauge structure;
as shown in fig. 2, for the convenience of installation, the guided wave radar level gauge further includes a guided wave structure fixing frame 600, a downward groove 610 for being clamped at the top edge of the tank or the pool to be measured is formed in the middle of a main body portion of the guided wave structure fixing frame 600, a wire groove is formed in the middle of the main body portion, a portion of the radio frequency cable 200 is located in the wire groove, a counterweight portion 620 is formed at one end, away from the tank or the pool to be measured, of the main body, a horizontally arranged through hole 630 is formed at one end, extending into the tank or the pool, of the main body, and the through hole 630 is sleeved on the metal sleeve and supports the flange;
because when measuring the jar body or the pond of being surveyed that need measure the liquid level, need stretch into jar body with guided wave structure 400 from the top of the jar body or the pond of being surveyed or other openings, wherein guided wave structure 400 swings easily in jar body or pond, can't keep vertically motionless state, consequently need cup joint guided wave structure through the through-hole 630 of guided wave structure mount 600, can also hold in the palm simultaneously and fix ring flange 500, then fix the top edge at the jar body or the pond of being surveyed with this mount through the recess of the main part other end and configuration portion, make guided wave radar level gauge keep vertically motionless in jar body or pond.
The gauge outfit 100 is the utility model discloses the electronic parts of guided wave radar level gauge, fig. 3 shows the circuit module diagram of electronic parts in the gauge outfit, this gauge outfit 100 includes treater 110, this treater 110 is through control signal emission unit 120 transmission pulse signal, signal receiving unit 130 receives the signal of feeding back, and after signal amplification unit 140 enlargies, send to the treater and carry out analysis processes, the distance of emitter and measured liquid surface is directly proportional with the propagation time of pulse between them, can derive the liquid level height through the calculation, the liquid level height that calculates out can be shown by display element 150;
the wave guide head 300 is a transfer part of the wave guide radar liquid level meter, and a two-way radio frequency connector, a special-shaped radio frequency connector and the like are arranged in the wave guide head;
in practical application, most of nuclear power stations are high-temperature, high-humidity, strong-corrosion and strong-radiation environments, the meter head and the guided wave structure are changed into a split type by adopting a mode of connecting a low-attenuation radio frequency cable and a radio frequency connector, and the meter heads of electronic components such as a signal transmitting unit, an amplifying unit, a receiving unit, a processor and the like are placed in a mild environment without nuclear radiation, high-temperature, high-humidity or high pressure, so that the service life of the electronic components in the meter head is prolonged.
The wave guide structure 400 is formed by combining a coaxial metal sleeve and a wave guide rod or cable, the metal sleeve is used for protecting the wave guide rod or cable, on one hand, echo signals are enhanced by using metal characteristics, and the requirement of measuring low dielectric constant liquid is met, on the other hand, the high-temperature-resistant and corrosion-resistant metal material such as stainless steel is used for enhancing the strength of the wave guide structure, so that the wave guide structure is not easily damaged by collision, and meanwhile, the wave guide performance in high-radiation and corrosion places can be ensured;
as shown in the structural schematic diagram of the wave guiding structure shown in fig. 4, the wave guiding structure 400 includes a metal sleeve 420, the upper end of the metal sleeve 420 is fixedly connected by a flange 500, a metal wave guiding rod 410 is disposed inside the metal sleeve, the upper end of the metal wave guiding rod 410 passes through the flange 500, is connected with the radio frequency connector in the wave guiding head 300, and forms a loop with the radio frequency cable 200; the bottom of the metal sleeve 420 is provided with a limiting hole and a self-locking nut 430, and the lower end of the metal wave guide rod 410 passes through the limiting hole to be straightened and then is locked by the self-locking nut 430, so that the metal wave guide rod 410 is ensured to be in a state of being vertical to the liquid level in the metal sleeve 420, and the measurement precision is prevented from being influenced by the bending of the wave guide rod;
the utility model provides a guided wave radar level gauge is when carrying out level measurement to the liquid level, signal emission unit 120 by in the gauge outfit 100 sends pulse signal, this pulse signal is after the transmission of radio frequency cable 200, transmit the metal guided wave pole 410 in the guided wave structure 400, because this guided wave structure 400 is partly located below the liquid level, when pulse signal in metal guided wave pole 410 reachs the liquid level, the pulse signal that the liquid level reflection returns can retrace the signal reception unit 130 to gauge outfit 100 through this metal guided wave pole 410 again, send the operation in processor 110 after the amplification of signal amplification unit 140, calculate the liquid level height who reachs, show by display element 150.
According to the actual installation requirement or the use requirement, as shown in fig. 5, in the structural schematic diagram of the wave guiding structure of the further embodiment, a metal wave guiding cable 440 can be further selected in the metal sleeve 420, and the metal wave guiding cable 440 also needs a limiting hole and a self-locking nut 430 to perform straightening and locking so as to ensure verticality.
To sum up, the guided wave radar level gauge provided by the utility model solves the problem that the guided wave radar level gauge can endure high-dose nuclear radiation by making a split structure and optimizing the guided wave structure, and simultaneously, the guided wave structure is optimized, so that the intensity of echo signals is further improved, and the guided wave radar level gauge can be used for measuring liquid with low dielectric constant;
provides a technical scheme for liquid measurement in harsh environments such as high temperature, high humidity, strong radiation and the like;
the waveguide structure scheme for effectively measuring the low dielectric constant liquid is provided;
the installation scheme of the guided wave radar liquid level meter in the service environment (under the condition that liquid cannot be drained) is provided.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A radiation-resistant guided wave radar liquid level meter is characterized by comprising a meter head positioned at a far end, a guided wave head assembled together and a guided wave structure;
the gauge outfit comprises a processor, and a signal transmitting unit and a signal receiving unit which are respectively connected with the processor, wherein a signal amplifying unit is connected between the signal receiving unit and the processor;
a radio frequency connector is arranged in the waveguide head, is used for connecting a radio frequency cable with a low attenuation coefficient, and is communicated with a signal transmitting unit and a signal receiving unit of the gauge outfit;
the guide wave structure comprises a metal sleeve, the top of the metal sleeve is fixedly connected through a flange, a guide wave rod or a cable is arranged in the metal sleeve, one end of the guide wave rod or the cable penetrates through the flange to be connected with the radio frequency connector, and the other end of the guide wave rod or the cable is fixed at the bottom of the metal sleeve.
2. The fluid level gauge of claim 1, further comprising a guided wave structure mount comprising:
the main part, main part middle part have be used for the card to be surveyed jar body or pond top edge down recess, and the one end that the main part was kept away from the surveyed jar body or pond has counter weight portion, and the one end that the main part stretches into jar body or pond has the through-hole of a level setting, and this through-hole can pass metal sleeve, and the butt joint the ring flange.
3. The liquid level gauge of claim 1, wherein the bottom of the metal sleeve is further provided with a limit locking structure for straightening and locking the wave guide rod or the cable, and the limit locking structure comprises a limit hole for the wave guide rod or the cable to stretch and a self-locking nut for straightening the rod or the cable.
4. The fluid level gauge of claim 1, wherein the gauge head further comprises a display unit connected to the processor.
5. The liquid level gauge of claim 2, wherein the wave guide head, the wave guide structure and the wave guide structure holder are made of high temperature resistant, corrosion resistant and radiation resistant metal materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921314679.6U CN210346834U (en) | 2019-08-14 | 2019-08-14 | Radiation-resistant guided wave radar liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921314679.6U CN210346834U (en) | 2019-08-14 | 2019-08-14 | Radiation-resistant guided wave radar liquid level meter |
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| CN210346834U true CN210346834U (en) | 2020-04-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346016A (en) * | 2019-08-14 | 2019-10-18 | 中广核研究院有限公司北京分公司 | Anti-radiation guide wave radar liquid level gauge |
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- 2019-08-14 CN CN201921314679.6U patent/CN210346834U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346016A (en) * | 2019-08-14 | 2019-10-18 | 中广核研究院有限公司北京分公司 | Anti-radiation guide wave radar liquid level gauge |
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