A linear gas cabinet height measurement system

Abstract

The present invention relates to a linear gas tank height measurement system, comprising a radar level meter, which is invertedly installed just below the top edge of the linear gas tank, a reflection wave component, which is installed on the top edge of the linear gas tank and located just above the radar level meter, and a detection protection component, which is arranged on the outside of the radar level meter. Compared with the prior art, the present invention has higher reliability and safety, is easier to maintain and repair than the measurement method of installing the radar on the top, and also solves the problem that the non-contact radar level meter cannot perform measurement when there is snow on the top equipment of the linear gas tank.

Description

Technical Field

[0001] The invention relates to a measuring device, in particular to a linear travel gas cabinet height measuring system. Background Art

[0002] In the prior art, the following measurement methods are commonly used to measure the height of the bottom water seal straight stroke gas cabinet:

[0003] 1) Static pressure principle: Use a single flange capillary remote pressure transmitter, fix one end of the capillary on the top of the linear gas cabinet bell, and the linear gas cabinet bell moves as the liquid level changes in the linear gas cabinet. Since the capillary is filled with oil, the height of the capillary oil column will also change accordingly. Since the pressure is proportional to the change in the liquid level, the change in the liquid level in the linear gas cabinet is indirectly measured. The disadvantage of this method is that the density of the oil varies greatly with the temperature. For cold areas, the density change between winter and summer will cause a liquid level fluctuation of approximately ±3%. There is also zero drift. The most fatal thing is that the capillary is not suitable for fixing. For bad weather and the movement of the bell, the capillary is at risk of being involved or stuck, and accurate measurement cannot be guaranteed. For example, the Chinese patent CN201476755U discloses a device for measuring the height of a parallel multi-cavity constant pressure flexible storage linear gas tank, which is composed of a linear gas tank, an air bag, a counterweight frame, a magnet, and a measuring module. The measuring module is composed of a measuring circuit board composed of a chip and the like, and a measuring benchmark composed of a reed switch and scale lines. The chip is fixed on the measuring circuit board, and the 8 I / O ports of the chip are respectively connected to a reed switch, and the other end of the reed switch is grounded, and the reed switch is placed on the measuring benchmark; a counterweight frame is placed on the air bag, a magnet is provided on one side of the counterweight frame, and the magnet is located on one side of the measuring module, a counterweight is placed on the top of the counterweight frame, and the counterweight, counterweight frame, air bag, and magnet are located inside the linear gas tank; the measuring benchmark on the measuring module is located on one side of the linear gas tank. This patent does not solve the above technical problems either.

[0004] 2) Steel belt level gauge: The steel belt is fixed on the top of the equipment, and the transmitter and indicator are installed on the bottom of the equipment. The two are connected by a pulley block. The disadvantage of this method is that most of the steel belt level gauges on the market do not have SIL certification, and their reliability is low, and the mean time between failures cannot be fully guaranteed. In severe frost weather, there is a risk of freezing and ice hanging on the steel belt, which may cause the steel belt to be unable to retract the coil spring, affecting the measurement. For example, the wet spiral type storage straight stroke gas tank height measuring device for containing flammable gas disclosed in Chinese patent CN2183494. It is to install an arc track on the bell cover of the storage straight stroke gas tank and equipped with a height measuring pulley, connecting the wire rope, information code belt, steel belt and heavy hammer. The optical signal on the information code belt is converted into an electrical signal by the sensor and then transmitted to the secondary meter and alarm, which solves the problem of long-distance height monitoring and limit alarm of the storage straight stroke gas tank, but does not solve the problem of steel belt recovery affecting measurement.

[0005] 3) Top-mounted non-contact radar level gauge: As the liquid level in the linear-stroke gas tank changes, the bell of the linear-stroke gas tank moves. Therefore, the non-contact radar level gauge needs to be installed on the top of the equipment, which will result in an installation height that is too high, which is not conducive to inspection and maintenance. The accumulation of snow will cause the radar wave to encounter the snow, resulting in the radar wave scattering echo becoming smaller or even disappearing. For example, the linear-stroke gas tank height measurement system disclosed in Chinese patent CN103308117A includes: a radar level meter, which is arranged on the top of the linear-stroke gas tank and outputs the linear-stroke gas tank height data it monitors; a wind-solar complementary power supply, which is connected to the radar level meter to provide power for the radar level meter; a data receiving and displaying device, which is connected to the radar level meter to receive and display the height data output by the radar level meter. However, this patent cannot solve the problem of low accuracy caused by unstable radar signals. Summary of the invention

[0006] The purpose of the present invention is to provide a bottom water-sealed linear gas tank height measurement system in order to overcome the defects of the above-mentioned prior art, such as low measurement reliability and inconvenient installation and maintenance.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A linear gas cabinet height measurement system, comprising:

[0009] The radar level meter is installed upside down just below the top edge of the linear travel gas tank.

[0010] The reflected wave assembly is installed on the top edge of the linear travel gas tank, directly above the radar level meter.

[0011] The detection and protection component is arranged on the outside of the radar level meter.

[0012] The radar level meter is a non-contact high-frequency radar level meter. The radar wave is emitted from the bottom to the top, and the analog signal is output to the reflected wave component. By setting the radar level meter at the bottom of the linear gas tank, there is no need to go to the top of the linear gas tank for inspection and maintenance, which greatly reduces the risk and cost of maintenance. The radar level meter emits radar waves upward, and then receives the reflected signal to measure the height of the linear gas tank. Since there will be no snow accumulation under the reflected wave component, this solves the problem that the signal disappears or becomes smaller when the radar level meter is set at the top to send radar signals downward. Without changing the radar level meter itself, the installation method is reversed, using reverse thinking and unconventional methods to reverse the radar wave (usually the installation requirements of the radar level meter are: the radar wave needs to be emitted from top to bottom, and then the radar echo is received from bottom to top, and the height of the straight-stroke gas tank is indirectly measured by time domain reflection). However, this installation method is not suitable for the harsh environment of heavy snow accumulation weather. Due to the irregular geometric reflection of snowflakes, the radar wave echo is reduced and seriously lost, resulting in the radar level meter not being able to work normally under this working condition. Reversing the radar level meter can achieve unexpectedly better technical effects.

[0013] The radar level meter also has built-in surge protection. When the linear travel gas tank is arranged in an open area, the above components can be installed to prevent lightning strikes.

[0014] The beam angle of the radar wave is ≤4°. If the beam angle is larger, the transmitted wave will be more scattered, which is not conducive to the recovery of the transmitted wave and affects the measurement of the instrument.

[0015] The installation angle of the radar level meter is adjustable, and the radar wave is controlled to be accurately reflected onto the reflection wave component.

[0016] The reflected wave assembly is installed on the top edge of the bell jar of the linear travel gas cabinet.

[0017] The reflective wave component is a metal mesh, which can withstand the adverse working conditions of rainy days and strong winds, and ensure the reflectivity of radar waves. Its structural requirements are to recover all the transmitted waves as much as possible and to minimize the accumulation of rain and snow. The opening diameter of the metal mesh is 5-10mm; the diameter of the metal wire is 1.5-2.5mm.

[0018] The detection and protection component is a protection box or an insulation box. The use of the protection box can prevent external forces from damaging the radar level meter. The use of the insulation box enables the present application to be used in low-temperature environments, and electric heating and other methods are used to ensure the ambient temperature of the radar level meter when it is working. For environments with heavy snowfall, heating methods can also be used to melt the snow. The heating form can consider electric heating, steam heating or hot water heating according to actual working conditions, so that the snow is not easy to accumulate on the top of the detection and protection component and affect the detection results.

[0019] The top of the protection box or insulation box is inclined, arc-shaped, triangular or other non-horizontal structures, which can further prevent snow from accumulating. In addition, for ordinary precipitation and rainy environments, the above-mentioned non-horizontal structures such as inclined planes and arc tops are used to ensure that rain and snow do not accumulate, and the top of the protection box or insulation box will not be collapsed. The above technical solution ensures the effective transmission of radar waves and the prevention of rain and snow accumulation. Usually, an insulation box with an inclined top is used. A small amount of rain and snow will slide naturally using geometric shapes. If heavy snow causes accumulation, we use an electric heating cable with a temperature controller in the insulation box, which can adjust the temperature at any time to melt the rain and snow, ensuring that the radar level meter can also work normally under this working condition.

[0020] The material of the top of the protection box or the heat preservation box is a material that is easily penetrated by radar waves, including PTFE or PP material, so that radar waves can easily penetrate the top of the protection box or the heat preservation box to reach the reflected wave component. In addition, the above material has good mechanical strength and is not easily damaged.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. By setting a reflection wave component on the top of the linear gas tank and detecting the reflection wave, the problem of inaccurate measurement results due to unstable radar signals when the radar level meter is installed on the top of the linear gas tank is solved (when rain and snow are accumulated);

[0023] 2. The radar level meter is installed below the linear travel gas tank, which is convenient for maintenance and avoids the influence of bad weather on the top, thus extending its service life;

[0024] 3. By setting up detection and protection components, this test system can be used in different environments and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the installation structure of the linear stroke gas cabinet height measurement system;

[0026] Figure 2 This is a schematic diagram of the installation structure of the radar level meter;

[0027] Figure 3 This is a schematic diagram of the structure of the detection protection component.

[0028] In the figure, 1- radar level meter, 2- reflected wave component, 3- detection and protection component, 4- maintenance passage, 5- linear stroke gas cabinet, 6- temperature controller, 7- top plate, 8- asbestos insulation layer, 9- electric heating tape. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0030] Example 1

[0031] A linear gas cabinet height measurement system, the installation structure of which is as follows Figure 1 As shown, it includes a radar level meter 1, a reflection wave component 2, a detection and protection component 3, etc. The radar level meter 1 is installed upside down just below the top edge of the linear gas tank 5, and the specific position can be flexibly adjusted according to actual conditions. For example, it can be set in the middle position of the linear gas tank 5, or it can be set on the ground. This embodiment is installed below the linear gas tank 5, and the outer cover is provided with a detection and protection component 3 to further play a protective role. A maintenance passage is provided below the radar level meter 1 to facilitate access for inspection and maintenance. The reflection wave component 2 is installed at the top edge of the linear gas tank 5, just above the radar level meter 1.

[0032] The radar level meter 1 used is a non-contact high-frequency radar level meter. The radar wave is emitted from bottom to top, and the analog signal is output to the reflected wave component. The beam angle of the radar wave is ≤4°. By setting the radar level meter at the bottom of the linear gas tank, there is no need to go to the top of the linear gas tank for inspection and maintenance, which greatly reduces the risk and cost of maintenance. The radar level meter emits radar waves upward, and then receives the reflected signal to measure the height of the linear gas tank. Since there will be no snow accumulation under the reflected wave component, this solves the problem that when the radar level meter is set at the top of the equipment to send out radar signals downward, the signal will disappear or become smaller (there is snow accumulation), thereby obtaining an unexpectedly better technical effect. In addition, the radar level meter 1 has built-in surge protection, and the installation angle of the radar level meter 1 is adjustable, which controls the radar wave to be accurately reflected on the reflected wave component 2.

[0033] In this embodiment, the reflected wave component 2 is installed on the top edge of the bell of the linear gas cabinet, so as to facilitate the detection of the height of the linear gas cabinet. The reflected wave component 2 used is a metal mesh, which can not only resist the adverse working conditions of rain and snow accumulation and strong wind, but also ensure the radar wave reflectivity. The opening diameter of the metal mesh is 10mm; the diameter of the metal wire is 2.5mm.

[0034] The structure of the detection protection component 3 is as follows Figure 3As shown, the present embodiment adopts an incubator, so that the present application can be applied in a low temperature environment. The radar level meter 1 is arranged in the incubator, and an electric heating cable 9 is arranged above the incubator to heat the top, so as to melt the snow on the top of the incubator, and the temperature controller 6 is used to control the heating temperature. The top plate 7 of the incubator is an inclined structure, which can further prevent the snow from accumulating and the top of the incubator will not be collapsed. The top plate 7 is made of PTFE material, which is convenient for the radar wave to penetrate the top of the protection box to reach the reflected wave component. This material has good mechanical strength and is not easy to damage. In addition, the inner wall of the incubator is composed of an asbestos insulation layer 8 to prevent heat dissipation. In this way, electric heating and other methods are used to ensure the ambient temperature of the radar level meter when it is working. For environments with large snowfall, heating methods can also be used to melt the snow. The heating form can be considered according to the actual working conditions. Electric heating, steam heating or hot water heating makes it difficult for snow to accumulate on the top of the detection protection component, effectively preventing snow from affecting the detection results.

[0035] Example 2

[0036] A straight-stroke gas tank height measurement system, the structure of which is the same as that of Example 1, except that this embodiment does not need to be used in an extremely low temperature environment, so the detection protection component used is a protection box to prevent external forces from damaging the radar level meter. The top of the protection box is an arc-shaped structure. The use of such a non-horizontal structure can ensure that rain and snow do not accumulate and the top of the protection box will not be collapsed. In addition, the top of the protection box is made of PP material, which facilitates radar waves to penetrate the top of the protection box to reach the reflected wave component. This material has good mechanical strength and is not easily damaged. The opening diameter of the metal mesh used is 8mm; the diameter of the metal wire is 2mm.

[0037] Example 3

[0038] A linear gas tank height measurement system, the structure of which is the same as that of Example 1, except that the top of the protection box of this embodiment is a triangular structure, and such a non-horizontal structure can ensure that rain and snow do not accumulate and the top of the protection box will not be crushed. In addition, the top of the protection box is made of PP material, which facilitates radar waves to penetrate the top of the protection box to reach the reflected wave component. This material has good mechanical strength and is not easy to damage. The opening diameter of the metal mesh used is 5mm; the diameter of the metal wire is 1.5mm.

[0039] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A linear gas cabinet height measurement system, characterized in that: The measurement system includes: The radar level meter is installed upside down just below the top edge of the linear travel gas tank. The reflected wave assembly is installed on the top edge of the linear travel gas tank, directly above the radar level meter. A detection and protection component is arranged on the outside of the radar level meter; The radar level meter emits radar waves from bottom to top and outputs analog signals to the reflected wave component; The reflected wave component is a metal mesh; The detection and protection component uses an insulation box with an inclined top, and an electric heating cable with a temperature controller is used in the insulation box; The opening diameter of the metal mesh is 5-10 mm; the diameter of the metal wire of the metal mesh is 1.5-2.5 mm.

2. A linear gas cabinet height measurement system according to claim 1, characterized in that: The radar level meter is a non-contact high-frequency radar level meter.

3. A linear gas cabinet height measurement system according to claim 2, characterized in that: The beam angle of the radar wave is ≤4°.

4. A linear gas cabinet height measurement system according to claim 1, characterized in that: The reflected wave assembly is installed on the top edge of the bell jar of the linear travel gas cabinet.

5. A linear gas cabinet height measurement system according to claim 1, characterized in that: The material of the top of the heat preservation box is a material that is easily penetrated by radar waves, including PTFE or PP material.

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