Radar liquid level meter

Abstract

The utility model relates to the technical field of liquid level measurement, and discloses a radar liquid level meter which comprises a shell provided with a light transmitting part and an emitting surface, and the shell is further provided with an installation cavity. At least part of the circuit board is arranged in the mounting cavity, the circuit board is provided with a radio frequency assembly and a light-emitting part, the radio frequency assembly and the light-emitting part are both electrically connected with the circuit board, the radio frequency assembly is arranged on the side, relatively close to the emitting surface, of the circuit board, and the light-emitting part is electrically connected with the circuit board. The light-emitting part is arranged on one side, relatively close to the light-transmitting part, of the circuit board; according to the radar liquid level meter provided by the utility model, through the matching of the light-emitting part and the light-transmitting part, the light-emitting part can output light signals of different states of the radar liquid level meter in the debugging process, namely, the debugging work of communication connection between the radar liquid level meter and upper equipment is also very convenient under the condition that the radar liquid level meter is not provided with a display screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level measurement technical field, concretely relates to a radar liquid level meter. BACKGROUND

[0002] In the field of industrial automation liquid level measurement, radar liquid level meter as a kind of key measuring instrument based on time travel principle, plays an important role. Its working principle is to utilize the characteristics of radar wave propagating in space at the speed of light, probe emits high-frequency pulse, the pulse is reflected when encountering the surface of the medium to be measured (such as liquid level), and the reflected wave is captured by the receiver in the instrument, the running time of pulse is measured accurately, and distance signal is converted into material level signal by the receiver component in the instrument, so as to realize the accurate determination of liquid level height.

[0003] The existing radar liquid level meter includes display screen and no display screen two types, for the radar liquid level meter without display screen, since data needs to be transmitted to digital display recorder or other upper computer with data processing, display function to visualize detection data, therefore, the communication connection of radar liquid level meter and upper equipment needs to be completed, and in the process of establishing communication connection, since the radar liquid level meter without display screen is not equipped with display unit, it is very inconvenient to judge whether the connection of radar liquid level meter and upper computer or digital display recorder is completed. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a radar liquid level meter to solve the problem that existing radar liquid level meter without display screen is inconvenient to judge whether the connection of radar liquid level meter and upper computer or digital display recorder is completed in the process of debugging.

[0005] The utility model provides a radar liquid level meter, which comprises:

[0006] The shell is provided with a light-transmitting part and a transmitting surface, and the shell is further provided with a mounting cavity;

[0007] The circuit board is at least partially arranged in the mounting cavity, and the circuit board is provided with a radio frequency component and a light-emitting piece, both of which are electrically connected to the circuit board.

[0008] The radar liquid level meter provided by the utility model provides a light transmission part on the shell, provides a channel for light transmission of the subsequent light emitting part, is convenient for observing the working state of the radar liquid level meter more intuitively in the debugging process of the radar liquid level meter without a display screen, realizes emission and reception of radar waves to measure the liquid level accurately, oppositely arranges the light emitting part and the light transmission part in the installation cavity, electrically connects the light emitting part and the second circuit board, cooperates the light emitting part and the light transmission part, can indicate the working state of the radar liquid level meter by emitting light when the radar liquid level meter is debugged, outputs state information of different light signals, makes the debugging work of the communication connection of the radar liquid level meter more convenient in the case that the radar liquid level meter does not have a display screen, and thus the problem that whether the connection is completed cannot be judged conveniently in the debugging process of the existing radar liquid level meter without a display screen is solved.

[0009] Optionally, the light transmission part is annular on the shell.

[0010] By setting the light transmission part as annular, the light can be uniformly distributed while ensuring the light transmission effect, the internal light emitting part state can be observed from multiple angles, the visual range and visual effect are improved, and the user can quickly judge the working state fed back by the radar liquid level meter in the debugging process from different directions.

[0011] Optionally, the shell comprises a shell body and a cover body, and the light transmission part is arranged at the connection between the shell body and the cover body.

[0012] By dividing the shell into the shell body and the cover body and arranging the light transmission part at the connection between the two, on the one hand, the installation and maintenance of the light transmission part are facilitated, and the shell body or the cover body can be disassembled and processed in a targeted manner when the light transmission part has a problem; on the other hand, the overall structure is more compact due to the structural design, and the stability of the radar liquid level meter is improved.

[0013] Optionally, the light transmission part comprises an annular light transmission area, a first extension area connected to the upper edge of the annular light transmission area, and a second extension area connected to the lower edge of the annular light transmission area; the first extension area extends towards the upper part of the annular light transmission area, the second extension area extends towards the lower part of the annular light transmission area, and the outer side walls of the first extension area and the second extension area are respectively provided with threaded structures; the first extension area is connected to the cover body through threads, and the second extension area is connected to the shell body through threads.

[0014] By arranging the annular light transmission area, the first extension area and the second extension area and arranging the threaded structures on the outer side walls of the first extension area and the second extension area, the first extension area is connected to the cover body through threads, and the second extension area is connected to the shell body through threads, which not only ensures the stability of the connection of the light transmission part and prevents the light transmission part from loosening to affect the light transmission effect, but also makes the operation in the assembly process simple and improves the production and assembly efficiency.

[0015] Optionally, the annular light-transmitting area forms a step structure protruding radially outward, the cover body abuts against the upper surface of the step structure, and the shell body abuts against the lower surface of the step structure.

[0016] The step structure is formed by the annular light-transmitting area, the cover body abuts against the upper surface of the step structure, and the shell body abuts against the lower surface of the step structure, thereby further enhancing the tightness of the light-transmitting part and the connection between the shell body and the cover body, effectively preventing impurities such as dust and water vapor from entering the installation cavity from the connection, thereby protecting the internal electronic components and improving the reliability and service life of the radar liquid level meter.

[0017] Optionally, the circuit board includes a first circuit board, and the installation cavity of the shell has a step facing the first circuit board, and the edge of the first circuit board is supported on the step.

[0018] By supporting the edge of the first circuit board on the step in the installation cavity of the shell and connecting the radio frequency assembly to the first circuit board, the stability of the installation position of the radio frequency assembly in the shell is ensured, and the transmission and reception accuracy of the radar wave is avoided from being affected by shaking during operation, thereby ensuring the accuracy of liquid level measurement.

[0019] Optionally, a positioning screw is connected between the edge of the first circuit board and the step in the installation cavity.

[0020] By connecting the positioning screw between the edge of the first circuit board and the step in the installation cavity, the installation position of the first circuit board is further reinforced, so that it can still remain stable in a complex working environment (such as vibration, collision, etc.), and the high-precision measurement performance of the radar liquid level meter is maintained.

[0021] Optionally, the circuit board includes a second circuit board, and the second circuit board is connected in parallel and spaced apart from the first circuit board on a side away from the emitting surface through a support column, and the second circuit board has a reserved hole for exposing the positioning screw.

[0022] By connecting the second circuit board above the first circuit board in parallel and spaced apart through the support column, and providing the reserved hole for the positioning screw on the second circuit board, the space in the installation cavity is reasonably utilized, the orderly layout and the operability of installation of the second circuit board and the first circuit board are realized, and the positioning screw is conveniently tightened, so that the overall structural stability of the radar liquid level meter is ensured without affecting subsequent maintenance work.

[0023] Optionally, the step is an annular step, and the joint surface of the annular step for contacting the edge of the first circuit board has an annular groove, and a sealing ring is arranged in the annular groove.

[0024] By arranging the annular groove on the surface of the annular step and placing the sealing ring, the gap between the first circuit board and the mounting cavity of the shell is effectively sealed, preventing the intrusion of external water vapor, dust and the like, protecting the electronic components inside the shell, especially the key radio frequency components, thereby improving the adaptability of the radar liquid level meter in harsh environments.

[0025] Optionally, the radar liquid level meter further comprises a lens arranged in the mounting cavity, and the lens is a Fresnel lens.

[0026] By using the Fresnel lens for focusing, compared with ordinary lenses, the Fresnel lens has the characteristics of being thinner and lighter, and under the premise of not affecting the focusing and refraction effect of radar waves, the weight of the radar liquid level meter is reduced, so that the radar liquid level meter is convenient to install and carry, and the production cost is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 It is a front view of a radar liquid level meter according to an embodiment of the present application.

[0029] Figure 2 It is a sectional view of the internal structure of a radar liquid level meter according to an embodiment of the present application.

[0030] Figure 3 It is a structure diagram of a light transmission part in Figure 1

[0031] Figure 4 It is a structure diagram of a second circuit board in Figure 1

[0032] Figure 5 It is a structure diagram of a shell in Figure 1

[0033] MARKS OF THE DRAWINGS:

[0034] 1, shell; 2, mounting cavity; 3, lens; 4, second circuit board; 5, radio frequency component; 6, light emitting part; 7, shell body; 8, cover; 9, annular light transmission area; 10, first extension area; 11, second extension area; 12, threaded structure; 13, step structure; 14, first circuit board; 16, step; 17, positioning screw; 18, support column; 19, reserved hole; 20, annular groove; 21, circuit board; 22, groove.​​​ DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0036] In the field of liquid level measurement technology, the radar liquid level meter without display screen needs to transmit the detected data to the digital display recorder or other host computer in actual application, which inevitably involves the communication connection link between the radar liquid level meter and the host equipment. However, since such radar liquid level meter is not equipped with a display unit, it is difficult for technicians to intuitively judge whether it has successfully connected with the host computer or the digital display recorder in the process of establishing communication connection, which brings many inconveniences to the debugging work.

[0037] The embodiment provides a radar liquid level meter for solving the problem that whether the radar liquid level meter is connected with the host computer or the digital display recorder cannot be conveniently judged in the debugging process of the existing radar liquid level meter without display screen.

[0038] As shown in Figure 1 and Figure 2 The radar liquid level meter provided by the embodiment mainly comprises a shell 1 and a circuit board 21, the shell 1 is provided with a light transmission part and a transmitting surface, and the shell 1 is also provided with a mounting cavity 2; the circuit board 21 is at least partially arranged in the mounting cavity 2, the circuit board 21 is provided with a radio frequency component 5 and a light emitting piece 6, the radio frequency component 5 and the light emitting piece 6 are electrically connected with the circuit board 21, the radio frequency component 5 is arranged on the side of the circuit board 21 relatively close to the transmitting surface, and the light emitting piece 6 is arranged on the side of the circuit board 21 relatively close to the light transmission part.

[0039] The radio frequency component 5 can be a radar chip, and the light emitting piece 6 can be a light emitting diode.

[0040] This embodiment features a light-transmitting portion on the housing 1 and a light-emitting element 6 inside the housing 1, electrically connected to the circuit board 21. When the radio frequency component 5 sends a signal, the light-emitting element 6 emits light, which the user can observe through the light-transmitting portion, thus understanding the status information fed back by the radar level gauge during debugging (e.g., different colors, different flashing frequencies, different light emission durations, etc.). The light-emitting element 6 is connected inside the mounting cavity 2 and positioned opposite the light-transmitting portion. When the light-emitting element 6 is lit, the light can be displayed externally through the light-transmitting portion. This allows the user to quickly understand the status information of different light signals output by the radar level gauge during debugging, even when the radar level gauge lacks a display screen. This facilitates the debugging of communication connections and solves the problem of inconvenience in determining whether a connection has been completed during the debugging process of existing radar level gauges without display screens.

[0041] In this embodiment, the radio frequency component 5 is connected inside the mounting cavity 2 with the transmitting end and the receiving end facing the transmitting surface. On the one hand, this facilitates efficient transmission and reception of radar waves in conjunction with the lens 3. On the other hand, being protected by the housing 1 inside the mounting cavity 2 reduces the impact of external interference on its performance and ensures the accuracy of liquid level measurement.

[0042] It should be noted that this embodiment only limits the basic structure of the radar level gauge, and does not limit the shape of the light-transmitting part of the housing 1, nor does it limit the structure of the housing 1, the location of the light-transmitting part, or the specific structure of the light-transmitting part.

[0043] The shape of the light-transmitting part of the housing 1 in this embodiment will be described in detail below.

[0044] like Figure 2 and Figure 3 As shown, in some embodiments, the light-transmitting portions on the housing 1 are arranged in a ring shape.

[0045] Specifically, in this embodiment, by setting the light-transmitting part as a ring, several significant technical effects are achieved. First, in terms of light transmission, the ring design allows light to be evenly scattered from all 360 degrees, greatly expanding the visible range. This means that no matter where the operator stands around the radar level gauge, they can clearly capture the light signals emitted by the internal light-emitting element 6 and transmitted through the light-transmitting part, avoiding the loss of key indication information due to obstructed viewing angles or uneven light distribution. Second, in practical application scenarios, operators can intuitively judge the working status of the radar level gauge at a glance, quickly knowing whether it is operating normally and whether it has successfully established a communication connection with the host computer, thereby greatly improving the efficiency of debugging.

[0046] The structure of the housing 1 and the location of the light-transmitting part in this embodiment are described in detail below.

[0047] As Figure 1 and Figure 2 In some embodiments, the shell 1 comprises a shell body 7 and a cover 8, and the light-transmitting part is arranged at the joint of the shell body 7 and the cover 8.

[0048] Specifically, in the present embodiment, by designing the shell 1 to comprise a shell body 7 and a cover 8, and arranging the light-transmitting part at the joint of the two, firstly from the perspective of production assembly, through this modular design, the factory can independently process the shell body 7, the cover 8 and the light-transmitting part related components during the production and manufacturing process, and the production processes of each component do not interfere with each other, effectively improving the production efficiency and reducing the production cost. Secondly, from the perspective of equipment maintenance convenience, when the radar liquid level meter has problems during use, especially the components near the light-transmitting part, such as the failure of the light-emitting part 6, the need for maintenance or replacement of the light-transmitting part, the staff only needs to disassemble the cover 8, and then conveniently access the light-transmitting part and the internal components adjacent thereto, greatly simplifying the maintenance process and improving the availability of the equipment. Thirdly, from the perspective of structural stability, the combination of the shell body 7 and the cover 8 and the arrangement of the light-transmitting part at the joint make the structure of the entire shell 1 more compact and reasonable. The joint can provide certain support and positioning for the light-transmitting part, reducing the risk of displacement of the light-transmitting part due to external vibration, collision and other factors, and thus ensuring that the light of the internal light-emitting part 6 can stably pass through the light-transmitting part, ensuring the normal indication of the equipment working state and laying a foundation for the accuracy and reliability of liquid level monitoring.

[0049] In addition, in other embodiments, the shell 1 can consider adopting an integrated molding design, thereby reducing the number of components. Integrated molding can enhance the overall strength of the shell 1, reduce the risk of water and dust entering due to poor sealing at the joint, and especially in outdoor harsh environments or scenarios with high protection requirements, the protection performance of the integrated shell 1 is obviously superior. That is, whether the shell 1 is designed as an integrated or split structure, it belongs to the protection scope of the present embodiment.

[0050] The specific structure of the light-transmitting part of the present embodiment and the connection method thereof with the shell body 7 and the cover 8 will be described in detail below.

[0051] In some embodiments, the structure design of the light-transmitting part is as shown in Figure 2 and Figure 3As shown in the figure. It contains a ring-shaped light-transmitting area 9, and the first extension area 10 and the second extension area 11 connected thereto respectively, wherein the first extension area 10 is connected to the upper edge of the ring-shaped light-transmitting area 9 and extends upward from the ring-shaped light-transmitting area 9; the second extension area 11 is connected to the lower edge of the ring-shaped light-transmitting area 9 and extends downward from the ring-shaped light-transmitting area 9. The outer side wall of the first extension area 10 and the second extension area 11 is provided with a threaded structure 12, and the first extension area 10 is fixed with the cover 8 by threaded connection, and the second extension area 11 is also fixed with the shell body 7 by threaded connection.

[0052] In this embodiment, those skilled in the art can understand that through such a unique light-transmitting part structure design and connection method, first of all, from the installation stability, the first extension area 10 and the cover 8, the second extension area 11 and the shell body 7 are connected by the threaded structure 12, which can provide stronger fastening force. In the long-term operation of the radar liquid level meter, whether it is subjected to continuous vibration generated by the operation of the equipment itself, or accidental collision and impact from the external environment, this stable threaded connection can ensure that the light-transmitting part is firmly fixed in the predetermined position and cannot be displaced, so as to ensure that the light-transmitting part can always function normally and stably transmit light to provide accurate equipment status indication for the user. Secondly, from the production and assembly convenience, threaded connection makes the light-transmitting part have a clear installation guide during assembly. Workers only need to rotate the first extension area 10 to the cover 8 and the second extension area 11 to the shell body 7 according to the rotation direction of the thread, and perform rotating and tightening operation, so as to quickly complete the installation of the light-transmitting part, which is simple and easy to operate. This not only reduces human errors in the assembly process and improves the assembly quality of the product, but also greatly improves the production efficiency and saves labor cost and time cost. Thirdly, from the perspective of later maintenance, when the light-transmitting part needs to be repaired or replaced alone, or the cover 8 and the shell body 7 parts closely connected thereto need to be maintained, the threaded connection makes the disassembly work easy and convenient. Maintenance personnel only need to use the corresponding tool to unscrew the threaded connection, so as to easily remove the light-transmitting part or the related parts, which reduces the maintenance difficulty and is also conducive to quickly restoring the normal operation of the equipment.

[0053] The connection details of the light-transmitting part and the shell 1 of the present embodiment will be described in detail below.

[0054] As shown in Figure 1 and Figure 2 In some embodiments, the ring-shaped light-transmitting area 9 presents a step structure 13 protruding radially outward, the cover 8 can abut tightly on the upper surface of the step structure 13, and the shell body 7 can abut on the lower surface of the step structure 13.

[0055] Specifically, in the present embodiment, the person skilled in the art can understand that, by designing the annular light-transmitting area 9 with the radially outwardly protruding step structure 13, and abutting the cover 8 and the shell body 7 against the upper and lower surfaces of the step structure 13, firstly, from the aspect of structural stability, the step structure 13 provides stable and accurate positioning support for the annular light-transmitting area 9. During the assembly of the radar liquid level meter, the worker can easily and accurately fix the annular light-transmitting area 9 at the predetermined position according to the step structure 13, so that it is tightly matched with the shell body 7 and the cover 8, effectively avoiding problems such as deflection of the light-transmitting part caused by installation errors, ensuring the stability of the entire shell body 1 structure, and further creating a stable environment for the normal operation of the internal components. Secondly, from the aspect of sealing, the step structure 13 is tightly matched with the cover 8 and the shell body 7, forming a sealed barrier. In actual industrial environments, there are often impurities such as dust, water vapor, and oil stains. Once these impurities enter the interior of the shell body 1, they may corrode the internal precision electronic components of the shell body 1, affecting the performance and service life of the radar liquid level meter. The step structure 13 effectively blocks the gap at the connection between the light-transmitting part and the shell body 7 and the cover 8, greatly reducing the risk of impurity intrusion, ensuring that the internal electronic components are in a relatively clean and dry environment, improving the reliability of the equipment, and reducing the frequency of fault maintenance caused by environmental factors. Thirdly, from the aspect of light transmission effect, the stable step structure 13 support makes the annular light-transmitting area 9 position fixed, and it will not be displaced due to external vibration or slight collision. This ensures that the light emitted by the light-emitting part 6 can always be uniformly and stably transmitted through the annular light-transmitting area 9 and scattered outward, so that the user can clearly obtain the light-emitting indication information and accurately judge the working state of the equipment from any angle, improving the stability and reliability of the equipment state indication.

[0056] The composition and arrangement of the circuit board of the present embodiment will be described in detail below.

[0057] As Figure 2 , Figure 3 and Figure 4As shown, in some embodiments, the circuit board includes a first circuit board 14, and the mounting cavity 2 of the housing 1 has a step 16 facing the first circuit board 14, with the edge of the first circuit board 14 supported on the step 16. Specifically, the first circuit board 14 can be an radio frequency (RF) circuit board. In this embodiment, those skilled in the art will understand that by supporting the lower surface of the edge of the first circuit board 14 on the step 16 within the mounting cavity 2 of the housing 1, firstly, from the perspective of the stability of the RF component 5, the step 16 provides reliable physical support for the first circuit board 14. During the operation of the radar level gauge, the first circuit board 14, relying on the step structure 13, can always maintain a stable position, avoiding interference with the working state of the radar chip 15 due to shaking, thereby ensuring that the transmission and reception accuracy of radar waves are not affected, and thus ensuring the accuracy and reliability of the level measurement data. Secondly, in terms of assembly convenience, the step 16 greatly facilitates the installation of the first circuit board 14. In the production assembly stage, workers only need to place the edge of the first circuit board 14 on the step 16 to quickly and accurately complete the initial positioning without complex debugging and calibration processes, effectively improving production efficiency and reducing labor costs. Furthermore, from a maintenance and repair perspective, when maintenance, troubleshooting, or replacement of the radar chip 15 is required for the radio frequency component 5, the first circuit board 14, supported by the step 16, facilitates identification and operation by maintenance personnel. Maintenance personnel can quickly locate the first circuit board 14, and during disassembly, its stable support structure reduces the risk of accidental damage to surrounding components, making maintenance work safer and more efficient.

[0058] The connection of the circuit board in this embodiment will be described in detail below.

[0059] like Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments, a positioning screw 17 is connected between the edge of the first circuit board 14 and the step 16 in the mounting cavity 2.

[0060] Specifically, in the present embodiment, the skilled person can understand that by connecting the positioning screw 17 between the edge of the first circuit board 14 and the step 16 in the mounting cavity 2, firstly from the perspective of stability improvement, the positioning screw 17 provides additional fastening force for the first circuit board 14. When the radar liquid level meter faces complex and harsh working environment, the positioning screw 17 can tightly lock the first circuit board 14, making it closely fit with the step 16, eliminating the abnormal work of the radar chip 15 caused by shaking and displacement, ensuring the stable and accurate transmission and reception of radar waves, and thus ensuring the high precision of liquid level measurement, making the measurement data always reliable, meeting the extremely high precision requirements of industrial production. Secondly, from the perspective of long-term reliability, the existence of the positioning screw 17 effectively prevents the loosening of the first circuit board 14 caused by long-term accumulation of micro-vibration. Even after a long time of continuous operation, the first circuit board 14 can still be firmly positioned at the predetermined position, maintaining the stable output of the device performance, reducing the probability of failure caused by component loosening, reducing the frequency of equipment maintenance, and improving the overall service life of the equipment. Thirdly, from the perspective of maintenance convenience, when the radio frequency assembly 5 needs to be repaired, the radar chip 15 needs to be replaced, or the radio frequency signal related fault needs to be checked, the maintenance personnel only need to unscrew the positioning screw 17, and then the first circuit board 14 can be easily and safely removed, improving the maintenance efficiency and reducing the maintenance difficulty, and the device can quickly return to normal operation.

[0061] The structural details of the circuit board of the present embodiment will be described in detail below.

[0062] As shown in Figure 3 and Figure 4 , in some embodiments, the circuit board 21 includes a second circuit board 4 connected to the upper position of the first circuit board 14 (i.e. the side of the first circuit board 14 away from the emission surface) in a parallel and spaced manner by means of a support column 18, and the second circuit board 4 is provided with a reserved hole 19 for the positioning screw 17 to protrude. Specifically, the second circuit board can be a power supply circuit board.

[0063] In the present embodiment, the second circuit board 4 is connected in the mounting cavity 2 and used for electrical connection with the power supply, which can stably provide power support for the operation of the entire radar liquid level meter, ensuring the normal work of various electrical components such as the radio frequency assembly 5 and the light emitting member 6.

[0064] As shown in Figure 2 , Figure 5As shown, the mounting cavity 2 has a groove 22 outside the step 16, which can be used to accommodate the exposed end of the support column 18 connecting the second circuit board 4 and the first circuit board 14. In this embodiment, the edges of the second circuit board 4 and the first circuit board 14 are connected by several support columns 18, which are respectively clamped with the second circuit board 4 and the first circuit board 14, and part of the support column 18 is exposed from the first circuit board 14 to be accommodated in the groove 22.

[0065] Specifically, in this embodiment, firstly, from the perspective of space utilization, this double-layer circuit board layout fully and reasonably utilizes the three-dimensional space in the mounting cavity 2 of the shell 1. On the one hand, it avoids the risk of short circuit that may be caused by the direct contact between the second circuit board 4 and the first circuit board 14, ensuring the electrical safety of the equipment; on the other hand, it orderly stacks the two key circuit boards, effectively saving the horizontal space compared to the flat layout, making the internal structure of the radar liquid level meter more compact. Secondly, from the aspect of installation and maintenance convenience, the design of the reserved hole 19 facilitates the disassembly and assembly of the second circuit board 4 and the first circuit board 14. During the equipment assembly process, after installing the second circuit board 4, the worker can directly observe the positioning screw 17 at the edge of the lower first circuit board 14 through the reserved hole 19, which facilitates the initial tightening of the positioning screw 17, ensures the installation of the first circuit board 14, and improves the assembly efficiency. When maintaining the equipment later, the technician does not need to disassemble the entire second circuit board 4, but can conveniently tighten, loosen or replace the positioning screw 17 through the reserved hole 19 using a tool, which greatly simplifies the operation process, shortens the maintenance time, and improves the availability of the equipment. Thirdly, from the aspect of cooperative work stability, the parallel and spaced connection mode makes the second circuit board 4 and the first circuit board 14 maintain a stable relative positional relationship. The second circuit board 4 can stably supply power to the first circuit board 14, and the stability of power transmission will not be affected by factors such as shaking and displacement, thereby ensuring the normal work of the radio frequency component 5, and further maintaining the high-precision liquid level measurement performance of the radar liquid level meter.

[0066] The connection and sealing of the circuit boards of this embodiment will be described in detail below.

[0067] As shown in Figure 1 , Figure 2 and Figure 5 , in some embodiments, the step 16 is an annular step 16, and the upper surface of the annular step 16 (i.e. the joint surface of the annular step 16 for contacting the edge of the first circuit board 14) has an annular groove 20, and a sealing ring is arranged in the annular groove 20.

[0068] Specifically, in the present embodiment, those skilled in the art can understand that, from the waterproof and dustproof point of view, in actual industrial application scenarios, such as dusty harsh environments, or in factory workshops, there may be oil splashing, water vapor diffusion and the like. The combination of the annular groove 20 and the sealing ring forms a tight protective barrier. The sealing ring tightly fills the annular groove 20, which can effectively prevent external water vapor, dust, oil stains and other impurities from penetrating into the inside through the gap of the shell 1. This plays a key protective role for the internal precision electronic components, especially for the environmentally demanding radio frequency assembly 5, the second circuit board 4 and the like, greatly reduces the equipment failure rate caused by environmental factors, and ensures that the radar liquid level meter can operate stably for a long time in complex and harsh working conditions. Secondly, from the aspect of equipment stability, the annular step 16 as a support structure for bearing the first circuit board 14, its annular design makes the stress more uniform. When the radar liquid level meter is subjected to external vibration, the annular step 16 can smoothly support the first circuit board 14, avoiding displacement and deformation of the first circuit board 14 due to uneven local stress, thereby ensuring the stability of radar wave transmission and reception and maintaining the high precision of liquid level measurement. Furthermore, from the perspective of equipment service life, good sealing performance prevents impurities from entering, reduces damage to electronic components caused by corrosion, short circuit and the like, and also reduces the maintenance frequency. At the same time, stable structural support prolongs the normal working period of key components, so that the service life of the entire radar liquid level meter is improved.

[0069] The type of the lens 3 of the present embodiment will be described in detail below.

[0070] As shown in Figure 2 and Figure 5 In some embodiments, a lens 3 is further included, which is arranged in the mounting cavity 2. The lens 3 plays a role in converging and diverging the radar waves transmitted and received by the radio frequency assembly 5, optimizes the transmission path of the radar waves, and improves the measurement accuracy.

[0071] Specifically, in the present embodiment, the lens 3 is a Fresnel lens 3. Those skilled in the art can understand that the Fresnel lens 3 has a unique optical structure, and compared with a conventional ordinary lens 3, it can more effectively focus and guide wave lines.

[0072] Of course, the above description is not limiting, and in some alternative embodiments, the lens 3 can be omitted, so that a corresponding through hole is reserved.

[0073] As shown in Figures 1 to 5 The working process of a radar liquid level meter of the present embodiment is as follows:

[0074] 1. First, the power supply provides power to the second circuit board 4 connected in the mounting cavity 2 of the housing 1. The second circuit board 4 transmits power to the radio frequency component 5 and the light-emitting component 6 that are electrically connected to it.

[0075] 2. The transmitter of the radio frequency component 5 emits a high-frequency pulse to the surface of the medium to be tested (such as a liquid surface) through a lens 3 facing the outside of the housing 1. The pulse propagates in space at the speed of light.

[0076] 3. When the pulse encounters the surface of the medium under test, it is reflected. The reflected wave is captured by the receiver of the radio frequency component 5. Since both the transmitter and receiver of the radio frequency component 5 face the lens 3, it is convenient to receive the reflected wave.

[0077] 4. Simultaneously, the light-emitting element 6, electrically connected to the second circuit board 4, is positioned opposite the light-transmitting part of the housing 1 within the mounting cavity 2. The light-emitting element 6 illuminates, emitting light outward through the light-transmitting part. When the radar level gauge establishes a communication connection with the host computer or digital display recorder, the operator can visually determine whether the radar level gauge has completed the communication connection by observing whether light is emitted from the annular light-transmitting area 9.

[0078] 5. Finally, the radio frequency component 5 transmits the received reflected wave signal to the relevant components. By accurately measuring the pulse running time, and with the help of the receiver component of the host computer or digital display recorder, the distance signal is converted into a level signal, thereby realizing the accurate measurement of the liquid level height.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. A radar level gauge, characterized in that The application relates to a shell (1) provided with a light-transmitting part and an emitting surface, wherein the shell (1) is further provided with a mounting cavity (2); a circuit board (21) is arranged in the mounting cavity (2) at least partially, the circuit board (21) is provided with a radio frequency component (5) and a light-emitting element (6), the radio frequency component (5) and the light-emitting element (6) are electrically connected with the circuit board (21), the radio frequency component (5) is arranged on one side of the circuit board (21) relatively close to the emitting surface, and the light-emitting element (6) is arranged on one side of the circuit board (21) relatively close to the light-transmitting part. The shell (1) comprises a shell body (7) and a cover body (8), and the light-transmitting part is arranged at the joint of the shell body (7) and the cover body (8). The light-transmitting part comprises an annular light-transmitting area (9), a first extending area (10) and a second extending area (11), and the annular light-transmitting area (9), the first extending area (10) and the second extending area (11) are an integral piece.

2. The radar level gauge according to claim 1, characterized in that The first extending area (10) is arranged on one side of the annular light-transmitting area (9) relatively close to the cover body (8), the second extending area (11) is arranged on one side of the annular light-transmitting area (9) relatively close to the shell body (7), the first extending area (10) is connected with the cover body (8) through screw threads, and the second extending area (11) is connected with the shell body (7) through screw threads.

3. The radar level gauge according to claim 2, characterized in that The annular light-transmitting area (9) is provided with a stepped structure (13), the cover body (8) abuts against the stepped structure (13), and the shell body (7) abuts against the stepped structure (13). The circuit board (21) comprises a first circuit board (14), the mounting cavity (2) of the shell (1) has a step (16) facing the first circuit board (14), and the edge of the first circuit board (14) is supported on the step (16).

4. The radar level gauge according to claim 3, characterized in that A positioning screw (17) is connected between the edge of the first circuit board (14) and the step (16) in the mounting cavity (2).

5. The radar level gauge according to claim 1, characterized in that The circuit board (21) comprises a second circuit board (4), the second circuit board (4) is connected in parallel and at a distance from one side of the first circuit board (14) away from the emitting surface through a supporting column (18), and the second circuit board (4) is provided with a reserved hole (19) for exposing the positioning screw (17).

6. The radar level gauge according to claim 5, characterized in that The step (16) is an annular step (16), the joint surface of the annular step (16) for contacting the edge of the first circuit board (14) is provided with an annular groove (20), and a sealing ring is arranged in the annular groove (20).

7. The radar level gauge according to claim 6, characterized in that The application further comprises a lens (3), the lens (3) is arranged in the mounting cavity (2) and is a Fresnel lens.

8. The radar level gauge according to any of claims 5-7, characterized in that ​ 9. The radar level gauge according to any of claims 1-7, characterized in that, ​

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