CN111136000B - Gas compression vibrator - Google Patents

Abstract

The embodiment of the present invention relates to a gas compression vibrator. The gas compression vibrator includes: a sealed cavity; a vibrating member fixed in the sealed cavity; wherein the vibrating member includes a diaphragm, and a magnetic steel and a magnetic conductive piece located at the bottom end of the diaphragm. The piece is arranged between the magnetic steel and the diaphragm; the magnetic driving device is close to the outer surface of the sealed cavity and corresponds to the position of the magnetic steel. The magnetic driving device generates alternating current. The magnetic field drives the vibrating member to vibrate at a preset frequency. The embodiment of the present invention not only realizes the vibration function of gas, but also improves the safety performance of detection work.

Description

A gas compression vibrator

Technical field

Embodiments of the present invention relate to the technical field of position detection of buried gas PE pipelines, and in particular, to a gas compression vibrator.

Background technique

In the detection technology of the position of buried gas PE pipeline, a gas vibrator is usually used to add sound waves to the pressure gas in the pipeline.

In the related art, a widely used gas vibrator is a moving coil gas compression vibrator. Regarding the above technical solution, the inventor found that there are at least the following technical problems: for example, when the moving coil gas compression vibrator is working, a relatively large power electrical signal needs to be loaded on the coil, and the high power electrical signal will cause vibration. The device heats up, and in severe cases, it may lead to diaphragm rupture, coil burnout, etc. Especially when working in the internal environment of natural gas PE pipelines, problems such as heating and coil burnout caused by excessive current make the gas potentially dangerous to explode. Therefore, it is necessary to improve one or more problems existing in the above related technical solutions.

It is noted that this section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not admitted to be prior art by inclusion in this section.

Contents of the invention

An object of embodiments of the present invention is to provide a gas compression vibrator, thereby overcoming, at least to a certain extent, one or more problems caused by limitations and deficiencies of the related technology.

According to a first aspect of an embodiment of the present invention, a gas compression vibrator is provided, including:

sealed cavity;

A vibrating member is fixed in the sealed cavity;

Wherein, the vibrating member includes a diaphragm, a magnetic steel and a magnetically conductive piece located at the bottom end of the diaphragm, and the magnetically conductive piece is disposed between the magnet steel and the diaphragm;

The magnetic driving device is close to the outer surface of the sealed cavity and corresponds to the position of the magnet. The magnetic driving device generates an alternating magnetic field to drive the vibrating member to vibrate at a preset frequency.

In one embodiment of the present invention, the magnetic driving device includes a magnet wound around a coil, the coil is loaded with an AC signal with the preset frequency, and a capacitor of a preset capacity is connected in series to the coil loop.

In one embodiment of the present invention, the magnetic steel is an E-type magnetic steel.

In one embodiment of the present invention, the diaphragm is a cone-type diaphragm, and the magnetic steel and the magnetic conductive sheet are bonded to the bottom end of the diaphragm.

In one embodiment of the present invention, the magnetic steel is neodymium iron boron.

In an embodiment of the present invention, the sealed cavity is a non-metallic sealed cavity.

In an embodiment of the present invention, a cover plate is further included, and the cover plate covers the opening of the sealed cavity.

In an embodiment of the present invention, a sealing ring is further included, and the sealing ring is located between the cover plate and the opening of the sealing cavity.

In one embodiment of the present invention, a pipeline quick-connect socket is further included. The pipeline quick-connect socket is fixed on the cover plate, and one interface of the pipeline quick-connect socket is connected to the opening of the sealing cavity. The other interface is connected to the gas pipeline valve.

In an embodiment of the present invention, an exhaust valve is further included. The exhaust valve is provided on the cover plate and communicates with the opening of the sealing chamber.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

In the embodiment of the present invention, when detecting the position of the buried gas PE pipeline, it is only necessary to connect the sealed cavity of the gas compression vibrator with the gas pipeline, so that the gas in the pipeline enters the sealed cavity. At this time, the gas in the sealed cavity is located in the sealed cavity. The external magnetic drive device generates an alternating magnetic field, which drives the movement of the magnet steel and magnetic conductive sheet located in the sealed cavity through electromagnetic induction. The movement of the magnet steel and magnetic conductive sheet drives the diaphragm on it to vibrate, thereby pushing the sealed cavity. The gas inside vibrates. Through the above device, on the one hand, the vibration function of the gas is realized; on the other hand, the magnetic driving device is located outside the sealed cavity. The vibrating part itself has no connections, no voltage and current, almost no heat, and can safely mix with combustible gases. Being in a space improves the safety of detection work to a certain extent.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a schematic structural diagram of a moving coil gas compression vibrator in the prior art;

Figure 2 shows a schematic structural diagram of a gas compression vibrator in an exemplary embodiment of the present invention;

Figure 3 shows a schematic diagram of a coil loop in an exemplary embodiment of the present invention.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of the example embodiments. To those skilled in the art. The described features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

In addition, the accompanying drawings are only schematic illustrations of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.

Referring to Figure 1, the basic structure of the moving coil gas compression vibrator 100 is to place a coil 110 in the magnetic field of the magnet 120, load the audio current to the coil 110 through the terminal board 130, and the coil 110 will generate audio frequency. The changing magnetic field of the current interacts (attracts or repels) with the magnetic field generated by the magnet, causing the coil 110 to vibrate. The coil 110 then drives the diaphragm 140 connected to it to vibrate together, thereby pushing the surrounding gas and generating gas. The compression and relaxation cause the gas to vibrate.

However, in practical applications, when the moving coil gas compression vibrator 100 is working, a relatively large power electrical signal needs to be loaded on the coil 110, and the high power electrical signal will cause the vibrator to heat up, and in serious cases, it will cause vibration. Faults such as membrane 140 rupture and coil 110 burning out. Especially when working in the internal environment of gas PE pipelines, problems such as heating and coil burnout caused by excessive current make the gas potentially dangerous to explode.

Based on this, in this exemplary embodiment, a gas compression vibrator 200 is first provided. Referring to FIG. 2 , the gas compression vibrator 200 may include a sealed cavity 210 , a vibrating member 220 and a magnetic driving device 230 . The vibrating member 220 is fixed in the sealed cavity 210. The vibrating member 220 also includes a diaphragm 221, a magnetic steel 222 and a magnetically conductive piece 223 located at the bottom of the diaphragm 221. The magnetically conductive piece 223 is disposed on the magnetic steel 222 and the diaphragm 221. between. The magnetic driving device 230 is close to the outer surface of the sealed cavity 210 and corresponds to the position of the magnet 222. The magnetic driving device 230 generates an alternating magnetic field to drive the vibrating member 220 to vibrate at a preset frequency.

When detecting the position of the buried gas PE pipeline, it is only necessary to connect the sealed cavity 210 of the gas compression vibrator 200 with the gas pipeline, so that the gas in the pipeline enters the sealed cavity. At this time, the magnetic drive located outside the sealed cavity 210 The device 230 generates an alternating magnetic field, and through electromagnetic induction, causes the magnetic steel 222 and the magnetically conductive sheet 223 located in the sealed cavity 210 to move. The movement of the magnetic steel 222 and the magnetically conductive sheet 223 in turn drives the diaphragm 221 thereon to vibrate, thereby promoting This causes the gas in the sealed cavity 210 to vibrate. Through the above device, on the one hand, the vibration function of the gas is realized; on the other hand, the magnetic driving device 230 is located outside the sealed cavity 210. The vibrating member 220 itself has no connections, no voltage and current, almost no heat, and can be safely and safely The combustible gases are located in the same space, which improves the safety of detection work to a certain extent.

Next, various parts of the above-described gas compression vibrator 200 in this exemplary embodiment will be described in more detail with reference to FIGS. 2 and 3 .

In one embodiment, the magnetic driving device 230 includes a magnet 231 wound around a coil 232. An AC signal with a predetermined frequency is loaded on the coil 232, and a capacitor with a predetermined capacity C is connected in series to the loop of the coil 232.

The gas compression vibrator 200 provided by the present invention is an excitation transformer in principle. From the electrical characteristics, it can be regarded as a power inductor, represented by the symbol L. When an AC signal passes through an inductor, the current and voltage applied to it will shift in phase. The current lags 90 degrees in phase with the voltage, and this current does not generate active power. This means that if the required frequency signal is directly loaded onto the coil 232 of the gas compression vibrator 200, there will be no power output, and a capacitor of appropriate capacity needs to be connected in series in the loop to reduce the voltage and current of the signal. Phase difference elimination, please refer to Figure 3 for details.

The value of the preset capacity C of the capacitor in the circuit needs to match the signal output frequency and the inductance L of the gas compression vibrator coil 232. When the capacitive reactance and inductive reactance in the circuit are equal, the phase difference in the circuit is zero. , the maximum output power. The specific formula is as follows:

2πfC＝1/2πfL

Among them, f is the output frequency of the signal source; C is the preset capacitance value; L is the inductance of the gas compression vibrator coil.

In a specific embodiment, the above-mentioned magnet 231 is an E-type magnet. The E-type magnet is symmetrical about the center and generates a more uniform magnetic field, which can cause the diaphragm 221 to vibrate more uniformly.

In the present invention, the material of the diaphragm 221 is not limited. For example, it can be a plastic diaphragm, a paper diaphragm, a biological diaphragm, etc. The specific selection can be made according to the actual situation.

In one embodiment, the diaphragm 221 is a cone-type diaphragm, and the magnetic steel 222 and the magnetic conductive sheet 223 are bonded to the bottom end of the diaphragm 221 . When the periphery of the cone-type diaphragm is fixed in the sealed cavity 210, the bottom end of the cone-type diaphragm is also closer to the inner wall of the sealed cavity 210. Correspondingly, the magnet 222 bonded to the bottom end of the cone-type diaphragm and The magnetically conductive piece 223 is also closer to the inner wall of the sealed cavity 210. In this way, the distance between the magnetic steel 222, the magnetically conductive piece 223 and the magnetic driving device 230 located outside the sealed cavity 210 can be reduced, so that the generated magnetic field is strengthened and increased. The vibration amplitude of the diaphragm 221 also increases the vibration amplitude of the gas in the sealed cavity 210, which is more convenient for measurement.

In one embodiment, the magnet 222 is neodymium iron boron. NdFeB is a permanent magnet material based on the intermetallic compound Re2Fe14B. It has excellent magnetic properties and can further enhance the generated magnetic field.

In one embodiment, the sealed cavity 210 is a non-metallic sealed cavity. The heat transfer capability of non-metallic materials is weaker than that of metallic materials, which can further reduce the impact of the magnetic driving device 230 on the vibrating member 220, and the non-metallic materials will not affect the generation of the magnetic field.

In one embodiment, the gas compression vibrator 200 further includes a cover plate 240 that covers the opening of the sealed cavity 210. The cover plate 240 makes it more convenient to connect the gas compression vibrator 200 to the gas pipeline. Specifically, Yes, the cover 240 is a metal cover.

In another embodiment, the gas compression vibrator 200 further includes a sealing ring 250. The sealing ring 250 is located between the cover plate 240 and the opening of the sealing chamber 210. The sealing ring 250 can seal the cover plate 240 and the opening of the sealing chamber 210. The connection is tighter to prevent gas leakage in the sealed cavity 210.

Exemplarily, the gas compression vibrator 200 also includes a pipeline quick-connect socket 260. The pipeline quick-connect socket 260 is fixed on the cover 240, and one interface of the pipeline quick-connect socket 260 is connected to the opening of the sealing cavity 210, and the other is connected to the opening of the sealed cavity 210. One interface is connected to the gas pipeline valve. The pipeline quick-connect socket 260 can quickly connect the gas compression vibrator 200 to the gas pipeline, thereby improving the efficiency of measurement work.

In one embodiment, the gas compression vibrator 200 further includes an exhaust valve 270 . The exhaust valve 270 is fixedly provided on the cover plate 240 and communicates with the opening of the sealed cavity 210 . When the gas compression vibrator 200 is connected to the gas pipeline, opening the gas pipeline valve can fill the sealed cavity 210 with gas, and starting the exhaust valve 270 can discharge the residual air inside the sealed cavity 210 to ensure that the sealed cavity 210 is completely Filled with gas, the measurement results are more accurate.

In a specific embodiment, the inductance L of the coil 232 of the gas compression vibrator 200 is measured to be: 82mH, the signal source frequency is set to 468.8Hz, and the compensation capacitance is obtained by substituting the phase compensation formula 2πfC=1/2πfL. The capacity of C is: 1.41uF.

Wire as shown in Figure 3. After actual measurement, when the sine wave signal source output power is 150W (voltage 50V, current 3A), the vibration amplitude of the diaphragm 221 of the gas compression vibrator 200 reaches 4cm, and the measured loudness at the interface is 115 decibel, which is equivalent to the sound field intensity of a 120W waterproof sound column. This experimental result verifies the feasibility of the design plan.

It should be understood that in the above description, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", The directions or positional relationships indicated by "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on The orientation or positional relationship shown in the drawings is only to facilitate the description of the embodiments of the present invention and simplify the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot It should be understood as a limitation on the embodiments of the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

In the embodiments of the present invention, unless otherwise expressly stipulated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Disassembly and connection, or integration; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the embodiments of the present invention, unless otherwise clearly stated and limited, the term "above" or "below" the second feature of a first feature may include direct contact between the first and second features, or may include direct contact between the first and second features. Two features are not in direct contact but are in contact through another feature between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may join and combine the different embodiments or examples described in this specification.

Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary technical means in the technical field that are not disclosed in the invention. . It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims (10)

1. A gas compression vibrator, characterized in that it includes: sealed cavity; A vibrating member is fixed in the sealed cavity; Wherein, the vibrating member includes a diaphragm, a magnetic steel and a magnetically conductive piece located at the bottom end of the diaphragm, and the magnetically conductive piece is disposed between the magnet steel and the diaphragm; The magnetic driving device is close to the outer surface of the sealed cavity and corresponds to the position of the magnet. The magnetic driving device generates an alternating magnetic field to drive the vibrating member to vibrate at a preset frequency. 2. The gas compression vibrator according to claim 1, wherein the magnetic driving device includes a magnet wound around a coil, the coil is loaded with an AC signal having the preset frequency, and the coil loop A capacitor with a preset capacity is connected in series. 3. The gas compression vibrator according to claim 2, wherein the magnet is an E-type magnet. 4. The gas compression vibrator according to claim 3, wherein the diaphragm is a cone-type diaphragm, and the magnetic steel and the magnetic conductive sheet are bonded to the bottom end of the diaphragm. 5. The gas compression vibrator according to claim 1, characterized in that the magnetic steel is neodymium iron boron. 6. The gas compression vibrator according to claim 1, wherein the sealed cavity is a non-metallic sealed cavity. 7. The gas compression vibrator according to any one of claims 1 to 6, further comprising a cover plate covering the opening of the sealed chamber. 8. The gas compression vibrator according to claim 7, further comprising a sealing ring located between the cover plate and the opening of the sealing chamber. 9. The gas compression vibrator according to claim 7, further comprising a pipeline quick-connect socket, the pipeline quick-connect socket is fixed on the cover plate, and one of the interfaces of the pipeline quick-connect socket It is connected with the opening of the sealed cavity, and the other interface is connected with the gas pipeline valve. 10. The gas compression vibrator according to claim 7, further comprising an exhaust valve, the exhaust valve is arranged on the cover plate and communicates with the opening of the sealed cavity.