CN104835486B - A kind of fluid injection frequency modulation transducer - Google Patents

Abstract

The invention discloses a liquid injection frequency modulation transducer. The liquid injection frequency modulation transducer includes a liquid injection frequency modulation tube, and the liquid injection frequency modulation tube includes a frequency modulation cavity, and the frequency modulation cavity is used to hold liquid; The liquid frequency modulation tube can emit a sound of a certain frequency when it collides with other objects. When the material and size of the frequency modulation cavity are fixed, the liquid injection frequency modulation transducer can change the type of liquid in the frequency modulation cavity The frequency modulation can be carried out by means of and/or changing the amount of liquid contained in the frequency modulation cavity. The invention can be directly driven by ocean current energy, and can realize continuous adjustment of sounding frequency without changing the existing mechanical structure. The invention has novel principle, easy manufacture, compact structure and easy realization, and has important engineering application value.

Description

A liquid injection frequency modulation transducer

technical field

The invention belongs to the fields of new energy utilization and transducer design, and in particular relates to a mechanism for realizing frequency modulation through mechanical percussion and liquid injection in a wet mode.

Background technique

People's research on modern underwater acoustics began in 1826 with the experiment of measuring the speed of sound in water carried out by Swiss physicist Collado and French mathematician Stummer in Lake Geneva. In 1911, someone used a bomb as a sound source to carry out the first underwater echo detection experiment, and successfully recorded the echo to the bottom of the sea. It can be said that the sound source of the bomb explosion is the earliest underwater sound source used by people. In recent years, with the continuous expansion of the field of human activities to the ocean, people have widely used underwater sound sources according to different requirements. Underwater sound sources are used in deep sea geological exploration, offshore oil exploration, underwater target detection and other fields. Not only that, underwater sound sources are also widely used in military fields, such as underwater minesweeping and underwater acoustic interference countermeasures.

At present, the main underwater sound sources mainly include the following six types: explosive explosion sound source, electroacoustic transducer sound source, parametric array sound source, fluid dynamic sound source, laser sound source and plasma sound source. However, the main underwater sound source generation method has the following disadvantages: the sound source is in a sealed cavity, and there is a loss of sound energy transmission; mechanical transmission, the energy loss is large; the sound can only be produced in water for a long time under the condition of continuous external energy supply.

Existing mechanical transducers achieve frequency conversion by changing the shape, size, and material of the sounding body, which means that multiple sounding body structures need to be processed or the processed structure is complex, and it is troublesome and costly to adjust the sounding frequency. , and technically difficult to achieve continuous frequency conversion. Therefore, it is of great engineering application value to study a method to achieve frequency conversion without changing the structure of the sounding body.

Contents of the invention

The object of the present invention is to provide an efficient method for adjusting the sound frequency of a structure. By injecting different amounts and different types of liquids into the structure to change the sound frequency of the liquid-injected FM tube, the high-efficiency of the mechanical sound-emitting device is realized. Low cost and continuous adjustment of sound frequency.

The invention provides a liquid injection frequency modulation transducer, the liquid injection frequency modulation transducer includes a liquid injection frequency modulation tube, the liquid injection frequency modulation tube includes a frequency modulation cavity, and the frequency modulation cavity is used to hold liquid; The liquid frequency modulation tube can emit a sound of a certain frequency when it collides with other objects. When the material and size of the frequency modulation cavity are fixed, the liquid injection frequency modulation transducer can change the type of liquid in the frequency modulation cavity The frequency modulation can be carried out by means of and/or changing the amount of liquid contained in the frequency modulation cavity.

The liquid injection frequency modulation transducer of the present invention directly utilizes the ocean current energy to provide power, and drives the rotating arm to rotate through the pressure difference on both sides of the liquid injection pipe, so that the liquid injection pipes knock each other to make sound, and can adjust the liquid injection pipe The amount of water in changes the sound frequency, therefore, the present invention has the following significant advantages:

1) By adjusting the amount of liquid injected into the liquid injection tube to change the sound frequency, the continuous adjustment of the sound frequency can be easily realized;

2) Different frequency modulation ranges and frequency modulation accuracy can be obtained by changing the type of injection liquid;

3) The movement is simple and easy to install, and the structure of different frequency bands can be customized according to actual needs, which is convenient for engineering practical application;

4) The sound-generating device (including the sound-generating body) is directly placed in the seawater to emit sound, which avoids the energy loss when the sound passes through the wall, and is more conducive to the transmission of sound.

Description of drawings

Figure 1 is a comparison of the frequency modulation effects of injecting different types of liquids (kerosene, water, carbon tetrachloride);

Figure 2(1) is a comparison diagram of the frequency modulation effect of the first-order natural frequency of steel, aluminum and copper;

Fig. 2 (2) is the comparison chart of the frequency modulation effect of the second order natural frequency of steel, aluminum and copper;

Fig. 2 (3) is the comparison chart of the frequency modulation effect of the third order natural frequency of steel, aluminum and copper;

Fig. 3 is a cross-sectional view of a liquid injection frequency modulation tube according to an embodiment of the present invention;

Among them: 7 is a detachable push rod; 8 is a top cover; 9 is a frequency modulation cavity; 10 is a piston; 11 is a bottom sealing plug; 12 is a bottom cover; 13 is a first hole; 14 is a second hole;

Fig. 4 is a perspective view of a liquid injection frequency modulation transducer according to an embodiment of the present invention;

Among them: 1 is a triangular plate; 2 is a rotating shaft; 3 is a pipe; 4 is a rotating arm; 5 is a liquid injection frequency modulation tube; 6 is a bearing;

Fig. 5 is a top view of a liquid injection frequency modulation transducer according to an embodiment of the present invention;

Wherein, 15 is the hole that pipe is installed; 16 is the hole that rotating shaft is installed; 17 is the 3rd hole.

Detailed ways

In a basic embodiment, the present invention provides a liquid injection frequency modulation transducer. The liquid injection frequency modulation transducer includes a liquid injection frequency modulation tube, and the liquid injection frequency modulation tube includes a frequency modulation cavity, and the frequency modulation cavity is used for Hold liquid; the liquid injection frequency modulation tube can emit a sound of a certain frequency when it collides with other objects. When the material and size of the frequency modulation cavity are fixed, the liquid injection frequency modulation transducer The type of liquid contained in the chamber and/or the method of changing the amount of liquid contained in the frequency modulation cavity is used for frequency modulation.

In this embodiment, by using the liquid injection frequency modulation tube to collide with other objects, this object can be another liquid injection frequency modulation tube, or a pipe, and if it is a pipe, preferably, the The tube is made of the same material as the liquid injection frequency modulation tube, and the size is the same as that of the frequency modulation tube; thus, the liquid injection frequency modulation tube can emit a sound at a certain frequency, and the sound frequency can be easily realized by adjusting the amount of liquid injected into the liquid injection frequency modulation tube. Continuous adjustment of sound frequency; when the material and size of the frequency modulation cavity are fixed, the liquid injection frequency modulation transducer can change the type of liquid in the frequency modulation cavity, or change the volume of the liquid in the frequency modulation cavity How many ways to perform frequency modulation, or by using a combination of the aforementioned two ways to perform frequency modulation.

Combined with Figure 1, Figure 1 is a comparison of the frequency modulation effects of injecting different types of liquids (kerosene, water, carbon tetrachloride). In the comparison test, the outer radius of the frequency modulation cavity of the liquid injection frequency modulation tube is 0.04m, the inner radius is 0.03m, the length is 0.5m, and the material is stainless steel. It can be found from the figure that when kerosene is used, its frequency modulation range is 341Hz to 718Hz; when water is used, its frequency modulation range is 381Hz to 718Hz; when carbon tetrachloride is used, its frequency modulation range is 240Hz to 718Hz. When the injection liquid is carbon tetrachloride, the frequency modulation range is wider; when the injection liquid is water, the frequency modulation accuracy is higher. Therefore, different liquids such as kerosene, water, and carbon tetrachloride can be used to obtain different frequency modulation ranges and frequency modulation accuracy.

The liquid injection frequency modulation transducer provided by the present invention does not limit the material and size design of the liquid injection frequency modulation tube. In practical application, it needs to be customized in advance according to the frequency modulation range and frequency modulation accuracy. As shown in Fig. 2(1), Fig. 2(1) and Fig. 2(3), they are the frequency modulation effect comparison diagrams of the first-order natural frequencies of steel, aluminum and copper respectively, and the frequency modulation effects of the second-order natural frequencies of steel, aluminum and copper Frequency modulation effect comparison chart, steel, aluminum, copper frequency modulation effect comparison chart of the third order natural frequency. It can be seen from the figure that for the three different materials, as the water injection depth increases, the sound frequency decreases continuously. Among them, the frequency modulation range of steel is larger, and the frequency modulation accuracy of copper is higher. Under the conditions of different water injection depths, the laws of the first three order sound frequencies of the three materials are the same.

In one embodiment, in order to conveniently change the type and/or depth of liquid injection, the frequency modulation tube for liquid injection is further designed. That is, the liquid injection frequency modulation tube includes a frequency modulation cavity, and the two ends of the frequency modulation cavity are respectively connected with a top cover and a bottom cover; a first hole and a second hole are respectively arranged on the top cover and the bottom cover, and the first hole The push rod used to connect with the piston inside the tuning chamber passes through, and the second hole is sealed with a sealing plug. And for the convenience of reading the depth of the liquid injection, preferably, the push rod shaft is marked with a scale, and the amount of liquid injection is observed by reading the scale at the nozzle.

Furthermore, the push rod is detachably connected to the piston. The detachable connection may be that the push rod and the piston are connected by threads, or there may be corresponding buckles, or other connection methods that are convenient for insertion and extraction and for pushing and pulling the piston. In this way, it is convenient to increase or decrease the liquid injection volume of the frequency modulation cavity, and also to change the type of liquid injection conveniently, and then to carry out convenient frequency modulation. .

In a specific embodiment, the structure of the liquid injection frequency modulation tube is shown in Figure 3. When using the liquid injection frequency modulation tube (5) of this structure, push the push rod (7) from the first hole of the top cover (8) (13) inserts, links to each other temporarily with piston (10), and can control the up and down movement of piston (10). Open the sealing plug (11) on the bottom cover (12), pull up the piston (10) to suck the liquid from the second hole (14) into the tuning cavity (9), and close the sealing plug after sucking the liquid; otherwise, open the bottom sealing plug , push down the piston to discharge the liquid, close the sealing plug after the liquid is discharged, and remove the push rod. By increasing the liquid injection volume in the tube, the sound frequency of the liquid injection frequency modulation tube can be reduced; and by reducing the liquid injection volume in the tube, the sound frequency of the liquid injection frequency modulation tube can be increased.

Optionally, the sealing plug is threadedly connected to the bottom cover. In this way, it can be conveniently sealed or opened, and after sealing, it is not easy to fall off, which provides a reliable guarantee for sound collection.

In order to facilitate the use and control of the liquid injection frequency modulation tube, preferably, the two ends of the liquid injection frequency modulation tube are respectively equipped with rotating arms, and the bearings of the rotating arms are installed on a rotating shaft.

Further, there is a gap between the top cover and the bottom cover of the liquid injection frequency modulation tube (5) and the frequency modulation cavity, which is used to place a hollow cylinder perpendicular to the rotation arm on the rotation arm. Fixing the liquid injection frequency modulation tube in this way has the characteristics of convenient installation.

In another embodiment, in order to make the liquid-injected frequency-modulated transducer sound underwater for a long time without external energy supply, as shown in Figure 4, the described liquid-infused frequency-modulated transducer also includes two The tubes (3) have two liquid injection frequency modulation tubes (5) between the two tubes (3), and the two ends of the two liquid injection frequency modulation tubes (5) are respectively equipped with rotating arms (4). The bearing (6) of the arm is mounted on the same rotating shaft (2), and the length of the rotating arm (4) is such that the liquid injection frequency modulation tube (5) is aligned with the pipe (3) when rotating around the rotating shaft (2). Collide with each other between the bump and the liquid injection frequency modulation tube (5).

When using the liquid injection frequency modulation transducer in this way, when the liquid injection frequency modulation transducer is placed in the fluid during use, the fluid can flow through the middle of the two liquid injection frequency modulation tubes, according to Venturi effect, there is a pressure difference on both sides of each liquid-injected frequency-regulating tube, and the two liquid-injected frequency-regulating tubes (5) will move relative to each other until they collide in the opposite direction and collide with the tubes (3) on both sides. During the process, the liquid injection frequency modulation tube (5) is excited to emit a sound of a certain frequency. The liquid-injected frequency-modulated transducer with this structure is easy to realize, and the structure of different frequency bands can be customized according to actual needs, which is convenient for engineering practical applications; It has great advantages in the use of sea areas; and since the entire liquid-injected FM transducer can be directly placed in seawater to produce sound, the energy loss when the sound passes through the wall is avoided, and it is more conducive to the transmission of sound.

In order to fix the tube (3) and the rotating shaft (2) conveniently, in one embodiment, the liquid injection frequency modulation transducer further includes two triangular plates. As shown in Figure 5, two triangular plates have holes (15) for installing pipes and holes (16) for installing rotating shafts on three corresponding corners. After installation, the two pipes (3) and the rotating shaft (3) are perpendicular to the triangular plate. Optionally, the pipes (3) and the rotating shaft (2) are fixed on the two triangular plates by threads.

In one embodiment, the two triangular plates have a corresponding third hole (17) on the same corner where the rotating shaft (4) is installed, and the third hole (17) is used for injecting the frequency modulation transducer in the fluid Hook when dragging. When the liquid injection frequency modulation transducer is dragged down in the fluid, the fluid will flow through the middle of the two liquid injection frequency modulation tubes. According to the Venturi effect, there is a pressure difference between the two sides of each liquid injection frequency modulation tube. The two frequency modulation tubes will produce relative motion until they move in the opposite direction after collision and collide with the fixed tubes on both sides. During each collision, the liquid-filled FM tube is excited to emit a sound of a certain frequency. In this way, the movement of the liquid-injected frequency-modulating transducer is simple, and the energy required for sound generation is directly converted from the fluid, so that sound can be generated for a long time without external energy supply.

To sum up, the present invention provides a new type of frequency conversion method, which is easy to adjust, overcomes the traditional method of frequency conversion by changing the structure of the sounding body, and realizes continuous frequency conversion. The invention can conveniently realize the continuous adjustment of the sounding frequency by adjusting the amount of liquid injected in the liquid injection pipe to change the sounding frequency; by changing the type of liquid injection conveniently, different frequency modulation ranges and frequency modulation accuracy can be obtained; since the energy required for sounding is directly Converted from ocean current energy, it can produce sound underwater for a long time without external energy supply. It has great advantages in the use of remote sea areas. The whole device is placed in sea water to produce sound, eliminating the need for sound to pass through the wall. The energy loss during the time is more conducive to the transmission of sound; the movement of the whole device is simple and easy to install; before application, it is necessary to select the material and design the size according to the actual frequency range and accuracy required, so that the shape, size, material Under certain conditions, the frequency can be adjusted by changing the amount of liquid injected or the type of liquid injected, which is convenient for practical application in engineering.

The above detailed introduction to the present invention, the application of specific examples herein to explain the principle and implementation of the present invention, the description of the above embodiment is only used to help understand the method of the present invention and its core idea; at the same time, for the art For those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A kind of 1. fluid injection frequency modulation transducer, it is characterised in that：

   The fluid injection frequency modulation transducer includes fluid injection phasitron, and the fluid injection phasitron includes frequency modulation chamber, and the frequency modulation chamber is used for Hold liquid；The fluid injection phasitron can send the sound of certain frequency when colliding with other objects, in the tune In the case that the material and size of frequency chamber are fixed, the fluid injection frequency modulation transducer fills the species of liquid by varying frequency modulation intracavitary Mode and/or the frequency modulation intracavitary of changing fill liquid number mode carry out frequency modulation.
2. 2. fluid injection frequency modulation transducer according to claim 1, it is characterised in that：The both ends of the frequency modulation chamber (9) connect respectively There are head cover (8) and bottom cover (12)；There are the first hole (13) and the second hole (14), first hole on the head cover and bottom cover respectively (13) it is used to the push rod (7) that the piston (10) internal with frequency modulation chamber (9) is connected pass through, second hole (14) uses sealing-plug (11) seal.
3. 3. fluid injection frequency modulation transducer according to claim 2, it is characterised in that：The putter shaft is marked with scale.
4. 4. fluid injection frequency modulation transducer according to claim 2, it is characterised in that：The push rod is detachably to connect with piston Connect.
5. 5. fluid injection frequency modulation transducer according to claim 2, it is characterised in that：The sealing-plug is connected with bottom cover by screw thread Connect.
6. 6. fluid injection frequency modulation transducer according to claim 1, it is characterised in that：The both ends of the fluid injection phasitron (5) point There is not pivoted arm (4), the bearing (6) of the pivoted arm is installed on a shaft (2).
7. 7. fluid injection frequency modulation transducer according to claim 6, it is characterised in that：The head cover of the fluid injection phasitron (5) and There is gap between bottom cover and frequency modulation chamber, for placing on pivoted arm perpendicular to the hollow cylinder of pivoted arm.
8. 8. fluid injection frequency modulation transducer according to claim 6, it is characterised in that：The fluid injection frequency modulation transducer also includes two A pipe (3), there is two fluid injection phasitrons (5) between two pipes (3), and the length of the pivoted arm (4) can make fluid injection Phasitron (5) when being rotated around shaft (2) and pipe (3) collide and fluid injection phasitron (5) between mutually collide.
9. 9. fluid injection frequency modulation transducer according to claim 8, it is characterised in that：The fluid injection frequency modulation transducer further includes two Block set square, the set square are used for fixing tube (3) and shaft (2).
10. 10. fluid injection frequency modulation transducer according to claim 9, it is characterised in that：Two pieces of set squares be provided with turn There is corresponding 3rd hole (17) on the same angle of axis (4), the 3rd hole (17) is dragged in a fluid for fluid injection frequency modulation transducer Son is linked up with when dragging.