CN212058977U - Liquid level sensor and liquid level detection device - Google Patents

Abstract

The utility model discloses a level sensor and liquid level detection device, including first vibration sensor and second vibration sensor, the detection terminal surface place plane of first vibration sensor and second vibration sensor's detection terminal surface place plane parallel arrangement just has and predetermines the clearance. The liquid level sensor fully utilizes the principle that the vibration frequency is different in air and liquid to search the liquid level position, and the liquid level position is more accurate and real.

Description

Liquid level sensor and liquid level detection device

Technical Field

The utility model relates to a liquid level detection technical field especially relates to a level sensor and liquid level detection device.

Background

The main forms adopted by the current liquid level detection are a float type liquid level meter and a radar type liquid level meter.

Wherein, the principle of float-type level gauge: it is well known that objects in a liquid having a bulk density lower than that of the liquid will eventually float on the surface of the liquid, and this object may be referred to as a float. The buoyancy to which the float is subjected in a steady state is constant (also known as constant buoyancy). When the liquid surface position changes vertically, the vertical position of the float changes synchronously with the liquid surface position under the constant buoyancy effect. The float level meter is a device which expresses the vertical position of the float by various physical means such as mechanical, electromagnetic, optical and the like in a form that a person can directly read the vertical position.

However, the float-type liquid level meter has higher requirement on the measuring environment, and the surface of the measured liquid cannot have other influences on the stress of the float, such as floaters and the like. When the liquid surface has influence factors influencing the stress of the floater, the floater type liquid level meter cannot accurately reflect the real position of the liquid surface.

Principle of radar level gauge: the radar level gauge belongs to a general radar level gauge, and is a measuring instrument based on a time travel principle, wherein radar waves run at the speed of light, and the running time can be converted into a level signal through electronic components. The probe emits high-frequency pulses which are transmitted in space at the speed of light, and when the pulses meet the surface of the material, the pulses are reflected back to be received by a receiver in the instrument and convert distance signals into level signals.

In the practical application process of the radar liquid level gauge, the following disadvantages also exist: most economical pulsed microwave level gauges use microwave frequencies of 5.8GHz or 6.3GHz, with large radiation angles (about 30 °), which tend to produce interfering echoes on the tank wall or internals. Although the size of the horn antenna can be increased to slightly reduce the emission angle, the volume is increased, and the horn antenna is inconvenient to use; when the liquid level fluctuates and foams occur, the situation becomes more complicated, and signals are scattered to be separated from a propagation path or absorb most of energy, so that the signals returned to the receiving antenna of the radar liquid level meter are weaker or no signals return; when the storage tank is provided with obstacles such as a stirrer, a pipeline and the like, the obstacles can reflect electromagnetic wave signals, so that a false liquid level signal is generated; the meter needs to set more parameters, and once a problem occurs, it is often difficult to find out what reason the problem is caused. Errors may be reported if the antenna itself is inadvertently dipped in the medium. If the phenomenon of crystal icing can report errors, heating and heat preservation treatment are needed, and the antenna is cleaned; the initial installation needs to be an empty bin, i.e. an empty level, but most installation sites do not have this installation condition.

In summary, in the conventional liquid level detection, no matter a float type liquid level meter or a radar type liquid level meter generally has the problem that the real position of the liquid level cannot be accurately reflected. Therefore, how to solve the problem that the liquid level detection device cannot accurately reflect the real position of the liquid level in the liquid level detection becomes a technical problem that needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a level sensor and liquid level detection device to when solving the liquid level detection, the problem of the true position of liquid level can't the accurate reaction of liquid level detection device.

In order to achieve the above object, the utility model provides a liquid level sensor, including first vibration sensor and second vibration sensor, first vibration sensor's detection terminal surface place plane with second vibration sensor's detection terminal surface place plane parallel arrangement just has and predetermines the clearance.

Preferably, the liquid level sensor further comprises an auxiliary sensor for detecting liquid level changes, and a detection end face of the auxiliary sensor is perpendicular to a detection end face of the first vibration sensor and is arranged opposite to the preset gap.

Preferably, the vibration sensor further comprises a base, and the first vibration sensor, the second vibration sensor and the auxiliary sensor are all arranged on the base.

Preferably, a circumferential enclosing plate is further arranged on the base, and a circumferential hollow hole is formed in the enclosing plate.

Preferably, a water measuring probe and a grounding probe for assisting in detecting the water level are further arranged on the base.

Preferably, the preset gap is 1-3 mm.

Compared with the introduction content of the background technology, the liquid level sensor comprises a first vibration sensor and a second vibration sensor, wherein the plane where the detection end face of the first vibration sensor is located and the plane where the detection end face of the second vibration sensor is located are arranged in parallel and have a preset gap. In the practical application process of the liquid level sensor, the position of the liquid level sensor is adjusted, so that the detection end face of the first vibration sensor and the detection end face of the second vibration sensor are both positioned on the horizontal plane, then the liquid level sensor is integrally moved downwards in the vertical direction, when the detection result of one of the first vibration sensor and the second vibration sensor is the vibration frequency in the liquid, the liquid level sensor is indicated to be in contact with the liquid, and the detection result of the other vibration sensor is the vibration frequency in the air, the liquid level sensor is indicated to be not in contact with the liquid, the liquid level position is positioned in a preset gap between the plane of the detection end face of the first vibration sensor and the plane of the detection end face of the second vibration sensor, and the real position of the liquid level can be accurately reflected due to the small preset gap, the liquid level sensor fully utilizes the principle that the vibration frequency is different in air and liquid to search the position of the liquid level, so that the liquid level sensor is not influenced by liquid level floaters and the like.

Additionally, the utility model also provides a liquid level detection device, include level sensor and be used for the drive the actuating mechanism of the vertical motion of level sensor, this level sensor is the level sensor that any above-mentioned scheme described. Because above-mentioned level sensor has above-mentioned technological effect, consequently, the liquid level detection device who has above-mentioned level sensor also should have corresponding technological effect, and no longer repeated here.

Preferably, the drive mechanism is a servo drive mechanism.

Drawings

Fig. 1 is a schematic structural diagram of a liquid level sensor provided by an embodiment of the present invention.

In the above-mentioned figure 1, the first,

the device comprises a first vibration sensor 1, a second vibration sensor 2, an auxiliary sensor 3, a base 4, a coaming 5, a building cavity 6, a water measuring probe 7 and a grounding probe 8.

Detailed Description

The core of the utility model is to provide a level sensor and liquid level detection device to when solving the liquid level detection, the problem of the true position of liquid level can't the accurate reaction of liquid level detection device.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an embodiment of the present invention provides a liquid level sensor, including first vibration sensor 1 and second vibration sensor 2, the plane of the detection end face of first vibration sensor 1 is parallel to the plane of the detection end face of second vibration sensor 2, and has a preset gap.

In the practical application process of the liquid level sensor, the position of the liquid level sensor is adjusted, so that the detection end face of the first vibration sensor and the detection end face of the second vibration sensor are both positioned on the horizontal plane, then the liquid level sensor is integrally moved downwards in the vertical direction, when the detection result of one of the first vibration sensor and the second vibration sensor is the vibration frequency in the liquid, the liquid level sensor is indicated to be in contact with the liquid, and the detection result of the other vibration sensor is the vibration frequency in the air, the liquid level sensor is indicated to be not in contact with the liquid, the liquid level position is positioned in a preset gap between the plane of the detection end face of the first vibration sensor and the plane of the detection end face of the second vibration sensor, and the real position of the liquid level can be accurately reflected due to the small preset gap, the liquid level sensor fully utilizes the principle that the vibration frequency is different in air and liquid to search the position of the liquid level, so that the liquid level sensor is not influenced by liquid level floaters and the like.

It should be noted that, in the practical application process, the first vibration sensor 1 and the second vibration sensor 2 may be both selected from ultrasonic sensors, or may be selected from other vibration sensors commonly used by those skilled in the art, and are not limited to be more specific.

In a further embodiment, the liquid level sensor further comprises an auxiliary sensor 3 for detecting the liquid level change, and a detection end surface of the auxiliary sensor 3 is perpendicular to a detection end surface of the first ultrasonic sensor 1 and is arranged opposite to the preset gap. Through setting up auxiliary sensor, when the liquid level changes, can in time respond, then control level sensor and carry out the lift operation to make and find up-to-date liquid level position as early as possible. It should be noted here that when the liquid level is in the preset gap, the detection end face of the auxiliary sensor is partially immersed in the liquid and partially above the liquid level, and when the liquid level changes, the immersion area of the detection end face of the auxiliary sensor changes, so that the change of the liquid level can be known. When the auxiliary sensor detects the change of the liquid level, the auxiliary sensor can send a signal to the driving mechanism which vertically moves the liquid level sensor, and then the driving mechanism can timely respond to and drive the liquid level sensor to search for a new liquid level position.

In some specific embodiments, the liquid level sensor further comprises a base 4, and the first vibration sensor 1, the second vibration sensor 2 and the auxiliary sensor 3 are all disposed on the base 4. By providing a base, the arrangement of the first vibration sensor 1, the second vibration sensor 2 and the auxiliary sensor 3 can be made more convenient, and the subsequent connection to a driving mechanism for driving the vertical movement can be made more convenient.

It should be noted that, generally speaking, each sensor in the level sensor all adopts the sealed mode of whole welding, no movable part to avoid the movable part to cause the inaccurate problem of measurement because of the oil stain in the storage tank, also do not have the external connection, can cause the unreliable problem of connection because of oil gas corrodes in order to avoid the external circuit.

In a further embodiment, in order to prevent the detection end face of each sensor from being interfered by external environment, for example, floaters and the like are attached to the detection end face to influence the detection sensitivity. The base 4 is also provided with a circumferential enclosing plate 5, and the enclosing plate 5 is provided with a circumferential hollow hole 6. Through the structure that sets up bounding wall and building vacancy hole, can prevent that great floater from sheltering from the detection terminal surface of each sensor.

It should be noted here that the specific structure of the hollow-out hole 6 may be a circular hole, a kidney-shaped hole, a rectangular hole, a U-shaped hole, or the like, and the arrangement mode may be a vertical arrangement mode or an inclined arrangement mode, and in the practical application process, the specific structure may be selected according to the practical requirement, which is not limited herein.

In some more specific embodiments, the base 4 is further provided with a water detection probe 7 and a ground probe 8 for assisting in detecting a water level. Through setting up survey water probe and ground probe for ultrasonic level sensor can also find the surface of water position except can finding the liquid level position, has the condition that has oil and water simultaneously in the liquid storage pot for example, can find oil water boundary position through surveying water probe and ground probe.

In addition, the preset gap between the plane where the detection end surface of the first vibration sensor 1 is located and the plane where the detection end surface of the second vibration sensor 2 is located is small, and can be finely adjusted according to the requirement of detection precision, and generally, the preset gap is selected to be between 1 mm and 3 mm.

Additionally, the utility model also provides a liquid level detection device, include level sensor and be used for driving the actuating mechanism of the vertical motion of level sensor, wherein, this level sensor is the level sensor that any scheme described above. Because above-mentioned level sensor has above-mentioned technological effect, consequently, the liquid level detection device who has above-mentioned level sensor also should have corresponding technological effect, and no longer repeated here.

In some more specific embodiments, the specific structural form of the driving mechanism may be a servo driving mechanism, for example, a servo motor drives a liquid level sensor to move up and down through a steel wire, and may also be other linear driving manners commonly used by those skilled in the art, for example, a manner of driving a lead screw by a motor, a manner of driving an air cylinder or an oil cylinder, and the like. The driving mechanism drives the liquid level sensor to move along the vertical direction, and then the real position of the liquid level is found.

In addition, it should be noted that after the actual position of the liquid level is found, there are many ways to know the specific value of the liquid level from the actual position of the liquid level:

for example, the corresponding liquid level when the liquid level sensor is at the initial position may be calibrated, and then the current liquid level value may be obtained by subtracting the calibrated value from the distance value of the vertical movement of the liquid level sensor.

For another example, the distance value of the liquid level sensor moving in the vertical direction and the level value can be calibrated in a one-to-one correspondence manner, and when the liquid level sensor moves downwards to a certain position, the level value of the corresponding position can be directly read from prestored calibrated data.

The above two examples of the implementation manners of obtaining the liquid level through the liquid level position are given, and in the practical application process, other corresponding implementation manners may also be selected according to practical requirements, which is not more specifically limited herein.

It is right above the utility model provides a level sensor and liquid level detection device have carried out detailed introduction. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (8)

1. The liquid level sensor is characterized by comprising a first vibration sensor (1) and a second vibration sensor (2), wherein the plane of the detection end face of the first vibration sensor (1) and the plane of the detection end face of the second vibration sensor (2) are arranged in parallel and have a preset gap.

2. The liquid level sensor according to claim 1, further comprising an auxiliary sensor (3) for detecting a change in liquid level, a detection end face of the auxiliary sensor (3) being arranged perpendicular to a detection end face of the first vibration sensor (1) and facing the preset gap.

3. The liquid level sensor according to claim 2, further comprising a base (4), the first vibration sensor (1), the second vibration sensor (2) and the auxiliary sensor (3) being arranged on the base (4).

4. A level sensor according to claim 3, characterised in that the base (4) is further provided with a circumferentially arranged collar (5), the collar (5) being provided with a circumferentially arranged hollowed-out hole (6).

5. A liquid level sensor according to claim 3, characterized in that a water probe (7) and a ground probe (8) for assisting in detecting the water level are also provided on the base (4).

6. The fluid level sensor according to any one of claims 1 to 5, wherein the predetermined gap is 1-3 mm.

7. A liquid level detection device comprising a liquid level sensor and a driving mechanism for driving the liquid level sensor to move vertically, wherein the liquid level sensor is the liquid level sensor according to any one of claims 1 to 6.

8. The fluid level sensing apparatus of claim 7, wherein the drive mechanism is a servo drive mechanism.

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