WO2004111520A1

WO2004111520A1 - Noise attenuation apparatus mounted on the liquid conducting conduits and method for using the same

Info

Publication number: WO2004111520A1
Application number: PCT/CN2004/000659
Authority: WO
Inventors: Hongze Wang
Original assignee: Hongze Wang
Priority date: 2003-06-19
Filing date: 2004-06-21
Publication date: 2004-12-23
Also published as: CN1566734A

Abstract

Noise can be transmitted in solid, liquid and gas, but reflected at interface section between two different materials . Using said principle, a noise insulation component of the noise attenuation apparatus of the invention is made from a material differing in character of the liquid within the conducting couduits, to attenuate the noise of the fluid without stoping its flowing . The noise attenuation apparatus of the invention is simple in construction, broad in noise attenuation frequency, small in bulk, and yet little pressure loss to fluid.

Description

Muffler device and method installed on a fluid pipe TECHNICAL FIELD

The invention relates to a muffler device and a method thereof, and in particular to a device and a method for reducing the noise of a fluid in a pipeline. Background technique

The traditional muffler is generally a noise reduction device installed in the air flow channel of aerodynamic equipment (such as a blower or an air compressor) or in the intake and exhaust systems. According to its muffler mechanism, mufflers can be divided into six main types, namely resistive mufflers, resistive mufflers, impedance composite mufflers, micro-perforated plate mufflers, small hole mufflers and active mufflers.

The resistive muffler is made of sound absorbing material. When the sound wave enters the resistive muffler, the sound wave causes the air and small fibers in the gap of the sound-absorbing material to vibrate. Due to the effects of friction and viscous resistance, the sound energy is converted into thermal energy, thereby achieving the purpose of sound attenuation. This type of muffler can mute over a wide range of medium and high frequencies.

The resistant muffler is a combination of tubes and chambers with abrupt interfaces. It looks like an acoustic filter. Similar to an electric filter, each cell with a tube is a mesh of the filter and has its own natural frequency. When sound waves containing various frequency components enter the first short tube, only certain frequency sound waves near the natural frequency of the first mesh can reach the second short tube mouth through the mesh, while other frequencies Sound waves cannot pass through the mesh. Can only be reflected back and forth in the cell. Resistive muffler is suitable for eliminating middle and low frequency noise.

By combining the resistive structure and the resistive structure in a certain way, a resistive composite muffler is formed.

Micro-perforated plate muffler is generally made of a pure metal sheet with a thickness of less than 1mm. The sheet is perforated with a drill with a hole diameter of less than 1mm. The perforation rate is 1% -3%. By selecting different perforation rates and different cavity depths for the plate thickness, the spectral performance of the muffler can be controlled, so that it can obtain a good muffling effect in the required frequency range.

The structure of the small hole muffler is a straight pipe with a closed end, and many small holes are drilled in the pipe wall. The principle of the small hole muffler is based on the frequency spectrum of the jet noise. If the total area of the small holes is maintained and the number of small holes is increased, the area of each small hole is reduced. When passing through a small hole, the frequency spectrum of the jet noise will move to high frequency or ultra high frequency, so that the audible component of the human ear in the frequency spectrum is significantly reduced, thereby reducing interference and harm to people.

The basic principle of an active muffler is that in the original sound field, electronic equipment is used to generate a sound wave of the same magnitude and opposite phase as the original sound pressure, so that it cancels out the original sound field within a certain range. The muffler has limited muffler effect and the equipment used is complicated, which limits its application.

To sum up, the traditional muffling method, by forming different cavities or using sound-absorbing materials or manufacturing a sound field with the same phase as the original sound field, is used to mute the sound. It has low muffler efficiency, or a narrow muffler band. Or it has the disadvantages of complex structure, large volume, high cost, etc., and the large pressure loss caused to the fluid due to the complicated structure of the traditional muffler device reduces the power of the muffled device (such as an internal combustion engine). Summary of the Invention

In view of the above disadvantages, an object of the present invention is to provide a noise reduction muffler which is installed on a fluid pipeline and has a reduced reflection cross section to reduce the noise transmitted along the fluid in the pipeline. Device. ¹

Sound can propagate in solid, liquid, and gas media. When entering from one medium to another, when the properties of the two media (such as density, speed of sound propagation, etc.) are significantly different Most (or even most) sounds will be reflected, thereby reducing the effect of sound transmission.

The muffler of the present invention includes a housing. The housing has an inlet to allow fluid to flow into the muffler, and an outlet to allow fluid to flow out of the muffler. The muffler contains a sound insulation member. The sound-absorbing device containing the sound-insulating member is installed on a fluid pipe that needs to be silenced, so that the fluid can flow through the sound-absorbing device. In the case where the fluid is liquid, the sound-absorbing member of the present invention uses solid or gas as the sound-insulating member. In the case where the fluid is a gas, the muffler of the present invention uses solid or liquid as a sound insulation member, and the sound insulation member always separates the fluid at the inlet of the muffler from the fluid at the outlet, so that the fluid in the fluid The noise propagating in the pipe is reflected by the sound insulation member to achieve the purpose of reducing noise.

When a solid sound insulation member is used, the solid sound insulation member can be rotated, so that the fluid flowing into the muffler flows with the rotation of the sound insulation member from the inlet of the muffler to its outlet, and then Flow out from the outlet, or separately set the switch as a sound insulation member at the entrance and exit of the muffler, so that the two switches are not turned on at the same time, so that at any time, the sound insulation member in the muffler blocks its entrance. The fluid and the fluid at the outlet serve to reduce the noise by reflecting the noise propagating along the fluid, while allowing the fluid to flow through the muffler.

When the fluid in the pipeline is a liquid (or a gas), the muffler of the present invention interrupts the liquid (or a gas), §P, so that the liquid (or a gas) is divided into several parts by the gas (or a liquid), Noise is reflected at the gas-liquid interface, thereby achieving the effect of reducing noise. Brief description of the drawings

The present invention will be further described below with reference to the accompanying drawings, in which:

1A shows a cross-sectional view of a muffler using a rotor as a solid sound insulation member according to a first embodiment of the present invention. The state of the rotor in the figure allows fluid to flow into the inner cavity of the muffler;

1B shows a cross-sectional view of a muffler using a rotor as a solid sound insulation member according to a first embodiment of the present invention. The state of the rotor in the figure allows fluid to flow out of the inner cavity of the muffler;

FIG. 1C shows an enlarged cross-sectional view of the rotor and the inlet 1 and the outlet 4 in the muffler device according to the first embodiment of the present invention, and shows an included angle between the inlet 1 and the outlet 4 in a normal direction.

Figure 2 shows a cross-sectional view of a noise reduction device using a rotor as a solid sound insulation member according to a second embodiment of the present invention;

3 shows a cross-sectional view of a noise reduction device using two switches as a solid sound insulation member according to a third embodiment of the present invention;

4A shows a cross-sectional view of a muffler using two switches as solid sound insulation members according to a fourth embodiment of the present invention. The state of the two switches in the figure allows fluid to flow into the inner cavity of the muffler;

4B is a cross-sectional view of a muffler using two switches as solid sound insulation members according to a fourth embodiment of the present invention. The state of the two switches in the figure allows fluid to flow out of the inner cavity of the muffler;

Fig. 5A shows a rotor using three blades according to a fifth embodiment of the present invention Sectional view of a muffler as a solid sound insulation member;

5B shows a cross-sectional view of a muffler using a rotor with three blades as a solid sound insulation member according to a fifth embodiment of the present invention, where the fluid entering from the inlet can push the rotor blades to rotate;

6 shows a cross-sectional view of a muffler using a cylindrical rotor with two retractable blades mounted therein as a solid sound insulation member according to a sixth embodiment of the present invention; FIG. 7A shows a third embodiment of the present invention. A cross-sectional view of a muffler using a liquid sound-insulating member to muffle gas in a pipe according to a seventh embodiment;

7B shows a cross-sectional view of the muffler in which a sieve is added to the muffler in FIG. 7A to ensure that the inflowing gas becomes a bubble;

Fig. 7C shows the configuration of the screen in Fig. 7B.

7D shows a cross-sectional view after a heat sink is mounted on a muffler device in a seventh embodiment according to the present invention;

8A shows a cross-sectional view of a muffler using a liquid sound-insulating member to muffle gas in a pipe according to an eighth embodiment of the present invention, and in this embodiment a float is used; FIG. 8B shows a float according to the present invention A cross-sectional view of a muffler using a liquid sound-insulating member to muffle a gas in a pipe according to an eighth embodiment. In this embodiment, two floats are used;

Fig. 9 shows a cross-sectional view of a muffler device for muffling a liquid in a pipe using a gas sound-insulating member according to a ninth embodiment of the present invention. Detailed description of the invention

The specific content of the present invention is described in detail below through specific embodiments. FIG. 1 shows a cross-sectional view of a sound attenuation device using a solid sound insulation member according to a first embodiment of the present invention. The muffler has a sealed housing 2 with an inlet 1 and an outlet 4 connected to a fluid pipeline on the housing 2 and a guide hole in the housing 2 which is fixed on the housing 2 and includes a diameter penetrating a transverse interface thereof. The cylindrical rotor 3, the inlet 1 and outlet 4 on the housing 2, and the guide holes on the rotor are located on the same cross section of the rotor. When the guide holes are not in communication with the inlet and outlet, the cylindrical surface of the rotor 3 is blocked at the same time. Entrance 1 and exit 4. Entrance 1 and Exit 4 The included angle in the line direction is oc. As shown in FIG. 1C, α is other values not equal to 0 ° and 180 °, such as α = 90 °. The rotor 3 is controlled by an external power device (not shown) to rotate around the longitudinal center axis of the circle center passing through its cross section. When the rotor 3 is turned to a certain position, as shown in FIG. 1A, the guide hole 5 is connected to the inlet 1. At the same time, the rotor 3 closes the outlet 4. At this time, the fluid can enter the cavity A inside the housing 2 through the inlet 1 and the guide hole 5, but cannot flow out of the muffler through the outlet 4, so that the noise transmitted along the fluid is blocked by the rotor 3 reflects and cannot continue to propagate forward along the outlet 4. As shown in FIG. 1B, when the rotor rotates to another position, the guide hole 5 communicates with the outlet 4, and the fluid in the cavity A flows out through the guide hole 5 and the outlet 4. At the same time, the rotor 3 closes the inlet 1 so that the noise propagating along the fluid is reflected by the rotor 3, so the noise flowing from the fluid flowing out of the outlet 4 is reduced.

The rotor 3 is continuously switched between the position where the inlet 1 is closed and the outlet 4 is closed, and the position where the outlet 4 is closed is closed by the external power device, so that the fluid continuously flows through the muffler, and the rotor 3 is a solid at the same time. The sound insulation member always blocks the transmission of noise in the fluid, thereby achieving the effect of sound attenuation.

The housing 2 of the muffler device in this embodiment may be made of a rigid material, or may be made of a deformable material, such as an elastic material, or deformed by external force. For example, the housing 2 may be along the arrow shown in FIG. 1A. In the direction shown in the figure, it compresses and stretches, so that its inner cavity A becomes smaller or larger. In this case, when the pressure difference between the fluid at the inlet 1 and the outlet 4 is large (the pressure at the inlet 1 is stronger than that at the outlet 4), when the fluid flows from the inlet 1 into the cavity A, due to the pressure of the fluid itself, The casing 2 is stretched upward, and the cavity A is increased, or the casing 2 is stretched by an external driving device (not shown), so that more fluid enters the cavity A; when the inlet 1 is closed and the outlet 4 is connected Because the pressure of the fluid in the cavity A is stronger than the pressure at the outlet, the fluid flows out of the muffler from the outlet 4, and at the same time, due to the elasticity of the material of the housing 2 or the external pressure (not shown), the housing 2 is compressed, so that The volume of the housing is reduced, which speeds up the flow of fluid in the pipe through the muffler. Example 2

Fig. 2 shows a cross-sectional view of a noise reduction device using a solid sound insulation member in a second embodiment of the present invention. The same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and a description thereof will be omitted. This embodiment differs from the first embodiment only in the rotor The structure of 3 and the relative position with the inlet 1 and the outlet 4 have changed. In this embodiment, the rotor 3 is still cylindrical, and its cylindrical surface blocks the inlet 1 and the outlet 4, but the inlet 1 is located at one end of the rotor 3. And the outlet 4 is located at the other end of the rotor 3. On the rotor 3, two guide holes 6 and 7 passing through the rotor 3 along the diameter of the rotor cross section are located at the inlet 1 and the outlet 4, respectively. The central axis of the guide holes 6 and 7 has an included angle α. The rotor 3 is driven by an external power device (not shown) to rotate about its longitudinal center axis. When the guide hole 6 is connected to the inlet 1 and the guide hole 7 is not connected to the outlet 4, the fluid can pass through the inlet 1 and The guide hole 6 enters the cavity A; when the guide hole 7 and the outlet 4 are connected, the guide hole 6 is not connected to the inlet 1, and the fluid in the cavity A can flow out through the guide hole 7 and the outlet 4 at this time. In the same way as the first embodiment, the noise reduction device of this embodiment can pass fluid through the noise reduction device, and at the same time, the solid sound insulation member 3 is used to block the propagation of noise. Example 3

Fig. 3 shows a sectional view of a muffler device in a third embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and descriptions thereof are omitted. The rotor 3 in the first embodiment is replaced with two switches 8 and 9 in this embodiment. The opening and closing of the two switches 8 and 9 are controlled by an external power unit (not shown) so that when one of the two switches is in an open state, the other switch is in a closed state. Under the control of an external power device, the switches 8 and 9 are continuously switched between on and off, so that fluid can continuously flow through the cavity A of the muffler, and one of the switches 8 and 9 as the sound insulation member will always The fluid in the fluid pipes at both ends of the muffler is separated, and the propagation of noise is blocked to achieve the effect of muffler. Example 4

4A and 4B are cross-sectional views of a muffler using a solid sound insulation member according to another embodiment of the present invention, in which arrows indicate the direction of fluid flow. The inlet 1 and the outlet 4, and the switches 8 and 9 as sound insulation members have the same functions as the corresponding components in the third embodiment, and the cavity A is reduced to a tubular shape approximately the same as the diameter of the fluid pipe. Therefore, it is the same as the third embodiment. Compared with the example, the muffler device of this embodiment has a small volume and a simpler structure. Example 5

Fig. 5A shows a cross-sectional view of a noise reduction device using a solid sound insulation member according to another embodiment of the present invention. The housing 2 of the muffler is cylindrical, and has an inlet 1 and an outlet 4 on a cylindrical side wall of the housing 2, and its function is the same as that of the above embodiment. As shown in FIG. 5A, the rotor 10 in the housing 2 includes three rectangular blades of the same size and shape. These three blades are arranged radially outward from the center axis of the rotor, and the planes where the three blades intersect with the rotor. For the central axis, the included angle of each two blades is equal to 120 °, and the three blades are fixed to each other at the center of the rotor. Driven by an external drive (not shown), the rotor can rotate around its central axis, which passes through the center of the circular cross-section of the housing 2 vertically, from the central axis of the rotor 10 to the outermost of each blade The length of the end is exactly equal to the inner diameter of the circular cross section of the casing 2. In the direction perpendicular to the cross section of the muffler shown in FIG. 5A, the length of each blade is equal to the length of the casing 2. The inner cavity of the body 2 is divided into three space portions of equal size, B, C, which are isolated from each other. As shown in FIG. 5A, the inlet 1 and the outlet 4 divide the circumference of the cross section of the housing 2 into two arcs DE and FG. The inlet 1 and the outlet 4 are set such that the included angle of the two arcs DE and FG to the central axis of the rotor 10 is larger than the included angle of any two blades by 120 °, so that the inlet 1 and the outlet 4 will be at any time They are in different parts of space A, B and C, respectively. As the rotor 10 rotates, the fluid flows from the inlet 1 through the inner cavity of the housing 2 and flows out from the outlet 4, and between the inlet 1 and the outlet 4 there is always a blade of the rotor 10 as the rotor of the solid sound insulation member The blade of 10 plays a role in preventing noise from traveling along the fluid, thereby reducing the noise.

FIG. 5B shows a modification of the embodiment in FIG. 5A. The direction of the fluid pipeline connected to the inlet 1 is substantially tangent to the casing 2. After the fluid enters the casing 2 and flows in a direction substantially perpendicular to the radial direction, the blade is pushed. Rotation, therefore, without an external driving device, the rotor 10 can also be rotated to allow fluid to flow through the muffler.

In this embodiment, the number of rotor blades may be more than three, so that the included angle between any two adjacent blades is equal. The inlet 1 and the outlet 4 divide the circle of the cross section of the housing 2 into two arcs. The opening angle to the center of the circle is greater than the included angle of the adjacent blades. In this way, the blade as a solid sound insulation member can prevent the noise from spreading. Example 6

Fig. 6 is a cross-sectional view of a sound insulation device for a solid sound insulation member for concrete according to another embodiment of the present invention. The same components as those in the fifth embodiment are denoted by the same reference numerals, and a description thereof will be omitted. The cross section of the rotor 3 in the casing 2 is circular, and its radius is smaller than the radius of the internal cavity of the casing 2 and tangent to the internal cavity of the casing 2 at D. The rotor 3 is rotatable about a rotation axis that passes through the center of the cross-section perpendicular to it, and is always tangent to the housing 2 at D. As shown in FIG. 6, the rotor 3 has a flat groove passing through its diameter, and two blades 12 are inserted in the flat groove. The two blades are connected by a spring. When the spring force is zero, the maximum of the two blades is The distance at the outer end is larger than the diameter of the inner cavity of the housing 2, and when the blade is radially squeezed, it can be completely pressed into the rotor 3. In this way, during the rotation of the rotor, the two outer ends of the blade 12 are always in close contact with the inner cavity wall of the casing 2, so the rotor 3 and the blade 12 divide the inner cavity of the casing 2 into three isolated parts A, 8 with. .

The inlet 1 and the outlet 4 are located on both sides of the tangent point D of the rotor and the inner wall of the housing, and are close to the tangent point D. The rotor 3 can be rotated by an external driving device, so that the blade rotates from the tangent point D to the inlet direction, as shown in FIG. 6. In this way, the fluid that enters the inner cavity of the casing 2 from the inlet 1 flows in the casing 2 with the rotation of the rotor 3 and the blades 12, and finally flows out from the outlet 4. The rotor 3 and the two blades 12 as the sound insulation member always separate the fluid at the inlet 1 and the outlet 4, thereby preventing the propagation of noise in the fluid.

In the case of a certain pressure difference between the fluids at the inlet 1 and the outlet 4, the fluid pressure at the part A is stronger than the fluid pressure at the part B, which causes the two blades 12 to be imbalanced in force, causing the rotor 3 to rotate in the direction shown by the arrow. Therefore, even if no external driving device is used, the rotor can be rotated, and the fluid can flow through the muffler to achieve a muffler effect. Example 7

When the fluid in the pipeline is a gas, a liquid can be used as the sound insulation member. FIG. 7 shows a cross-sectional view of a sound attenuation device using a liquid as a sound insulation member in another embodiment according to the present invention. In the figure, the same components as those in the previous embodiment are denoted by the same reference numerals, and descriptions thereof are omitted. The casing 2 contains a liquid 25, such as water, as a sound insulation member, and the liquid does not fill the entire cavity of the casing 2. The gas inlet 1 is below the surface of the liquid such that All the gas flowing into the muffler enters the liquid, and a part of the pipeline communicating with the inlet 1 is higher than the liquid surface so that the liquid in the casing 2 does not flow out of the casing. The outlet 4 is above the liquid level. After the gas enters the liquid from the inlet 1, it becomes a bubble 24, and each of the bubbles is blocked by a liquid 25. Therefore, the noise in the gas is reflected by the gas-liquid interface and cannot be transmitted along the air flow channel, thereby achieving the effect of reducing noise. After the bubbles rise to the liquid surface, they flow out from the outlet 4.

In order to ensure that the airflow becomes bubbles after entering the liquid from the inlet 1, instead of directly rising to the liquid surface in the form of airflow, as shown in FIG. 7B, a sieve 27 is provided below the liquid surface and above the inlet 1, and there are multiple small The holes 28 (FIG. 7C) make the air flow or air bubbles from the outlet 1 become small air bubbles after passing through the sieve.

In the case that the liquid is relatively volatile, for example, the liquid is water, and the surface of the liquid may be covered with a layer of non-volatile liquid, such as oil, so as to reduce the volatilization rate of the liquid and extend the use time of the liquid sound insulation member. .

When the temperature of the inflowing gas is high, the liquid used as the sound insulation member is easily volatilized. A heat dissipation device 32 can be installed on the pipe and the casing 2 before the gas enters the muffler, as shown in FIG. 7D, to make the airflow temperature Lowering and lowering the temperature of the liquid in the casing 2 extends the usage time of the sound insulation member 25. Example 8

FIG. 8A is a cross-sectional view of a muffler using a liquid sound insulation member according to another embodiment of the present invention. The same components as those of the previous embodiment are denoted by the same reference numerals, and their description is omitted. The housing 2 has a float 33 that can float on the liquid 25, and a weight 36 is fixed at a position on the inner wall of the cavity of the float 33. Therefore, when the float 33 floats on the liquid 25, the float is fixed with a weight One side of 36 is always at the lower end. The gas pipelines connecting the inlet 1 and the outlet 4 in the casing 2 are all hoses. The inlet 1 is fixed on the lower side of the float 33, and the outlet 4 is fixed on the upper side of the float 33. In a state of severe bumps, or even upside down (for example, when used on an airplane), the inlet 1 is always located in the liquid 25, and the outlet 4 is always located above the liquid 25, so that the liquid 25 can always transfer the gas at the inlet and the gas at the outlet Divided to reduce noise. It is also possible to use two floats 33, 34. As shown in FIG. 8B, the inlet 1 is fixed on the downward side of the float 33, and the outlet 4 is fixed on the upward side of the float 34. Example 9

Fig. 9 shows a cross-sectional view of a muffler using a gas-insulating member to muffle liquid flowing in a pipe in another embodiment of the present invention. The same components as those of the previous embodiment are denoted by the same reference numerals, and their description is omitted. As shown in FIG. 9, the inlet is located at or near the top of the housing 2, and the outlet 4 is located at the bottom of the housing 2. When the liquid flowing from the inlet 1 drops, the speed gradually increases under the action of gravity, and the continuous fluid becomes separated droplets 41. The air separates the droplets, thereby preventing the propagation of noise in the fluid.

In the above embodiments, the shell of the muffler and the rotor and the rotor blades can be made of double-layer plates. The enclosed space between the double-layer plates can be evacuated or filled with sound-insulating materials, so as to achieve better results. Sound insulation effect. ·

In the above-mentioned embodiment of using the blade, the end of the blade contacting the inner side wall of the casing may be formed by an elastic device, for example, made of an elastic rubber material to make the blade closely contact the inner side of the casing to achieve a good sealing effect. Beneficial effect

From the foregoing detailed description of the present invention in conjunction with the accompanying drawings, it is not difficult to see the beneficial effects of the present invention. The prior art muffler is generally only suitable for eliminating noise in a gas, and the muffler using the solid sound insulation member or the gas sound insulation member of the present invention may be suitable for removing noise in a liquid. At the same time, the present invention uses a solid sound insulation Mufflers of components or liquid-insulating components are also suitable for removing noise in gases.

Due to the structure and other characteristics of the prior art muffler, it only has a good muffler effect on noise in a specific frequency band, and the muffler frequency band is narrow. It is suitable for eliminating middle and low frequency noise, and the muffler of the present invention uses the principle of sound reflection on different material interfaces to prevent the propagation of noise by increasing the reflection interface of noise in the noise propagation channel. Low-frequency noise is also reflected on the reflection interface, so the muffler device of the present invention can achieve a good muffling effect in a wider frequency band range. Existing mufflers use sound-absorbing materials or form different-sized cavities or small holes to mute the sound. Its structure is complex, and fluids are subject to greater resistance when flowing through devices with complex structures, resulting in fluid pressure loss (that is, the inlet of the muffler) The pressure difference between the fluid and the outlet is large, which may adversely affect the power of the silenced device (such as an internal combustion engine). The muffler of the present invention has a simple structure and a small volume, and at the same time as muffling, the pressure loss caused to the fluid is small.

The above embodiments are illustrative, rather than limiting, and those skilled in the art can make various changes and modifications without departing from the scope of protection of the present invention.

Claims

Claim

1. A muffler device installed on a fluid pipeline, comprising-a casing whose inner cavity can contain fluid;

An inlet (1) provided on the housing to allow fluid to flow into the inner cavity of the housing, and an outlet (4) to allow fluid to flow out of the inner cavity of the housing;

Two switches at the entrance and exit for controlling the opening and closing of the entrance and exit;

The two switches are controlled by an external driving device, so that when the inlet switch is in an open state to allow fluid to flow into the inner cavity of the housing, the outlet switch is in a closed state so that the fluid in the inner cavity of the housing cannot flow out of the outlet; then, the outlet switch is made In the open state, the fluid in the inner cavity of the shell flows out of the shell, and at the same time, the inlet switch is in a closed state so that the fluid cannot flow into the inner cavity of the shell; this process is continuously circulated. Therefore, at any time, the two switches will enter the inlet. The fluid is separated from the fluid at the outlet.

2. The muffler device according to claim 1, wherein:

The two switches are a cylindrical rotor with a guide hole (5) crossing its cross-sectional diameter fixed in the housing, so that the inlet and outlet and the guide hole are located in the same cross-section of the rotor, and make The cylindrical outer wall of the rotor can block the inlet and outlet, and the opening angle of the inlet and outlet to the center of the rotor cross section is any value not equal to 0 ° and 180 °;

When the rotor is rotated to a certain angle, the guide hole (5) is connected to the inlet, so that fluid can flow into the inner cavity of the housing, and at the same time, the side wall of the rotor blocks the outlet, so that the fluid in the inner cavity of the housing cannot flow out of the outlet. At another angle, the guide hole (5) is connected to the outlet, so that the fluid in the inner cavity of the housing can flow out from the outlet, and at the same time, the rotor side wall blocks the inlet, so that the fluid cannot flow into the inner cavity of the housing.

3. The muffler device according to claim 1, wherein:

The two switches are cylindrical rotors fixed on the housing and having two guide holes crossing their cross-sectional diameter, so that the inlet and the one guide hole are located on the same cross-section of the rotor Inside, the outlet and the other guide hole are located in another cross section of the rotor, and the cylindrical outer wall of the rotor can block the inlet and the outlet;

When the rotor is rotated to a position so that the inlet communicates with the one guide hole, the rotor blocks the outlet, and conversely, when the outlet communicates with the one guide hole, the rotor blocks the inlet.

4. The muffler according to claim 1, wherein the two switches are two independent switches.

5. The muffler device according to any one of claims 1 to 4, wherein the casing is made of an elastic material or is controlled by an external driving device, so its volume is variable. When fluid flows into the casing, due to the fluid's The volume of the shell becomes larger due to pressure or the stretching effect of the external driving device; when the fluid flows out of the shell, the volume of the shell decreases due to the elasticity of the material of the shell or the pressure of the external driving device.

6. The muffler device according to claim 4, wherein the casing is tubular, and two ports at the two ends of the tubular casing are an inlet and an outlet, respectively.

7. A muffler device installed on a fluid pipeline, comprising:

Cylindrical housing (2);

The rotor (10) in the housing (2) is composed of at least three rectangular blades of the same size and shape, so that the plane where the at least three blades intersect is a straight line, that is, the central axis (rotation axis) of the rotor. The blades are fixed to each other at the central axis; the at least three blades are arranged radially outward from the center axis of the rotor, and the angle between each two blades is equal, and the distance from the rotor centerline to the outside of each rotor is equal to Radius of the inner cavity of the shell; the central axis of the rotor coincides with the longitudinal central axis of the cylindrical shell, so that the rotor (10) divides the inner cavity of the shell (2) into a plurality of space portions of equal size that are isolated from each other;

The inlet (1) and the outlet (4) provided on the cylindrical side wall of the casing, so that fluid can flow into and out of the casing; the inlet (1) and the outlet (4) separate the circumference of the cross section of the casing Form two arcs, and the angle of each arc to the rotor's axis of rotation (ie, the central axis of the casing) is greater than the angle of the adjacent blades, so that the blades of the rotor always separate the inlet and outlet; Driven by an external power unit, the rotor can rotate around its axis of rotation;

The fluid flows from the inlet into the space in the casing separated by the blades which is in communication with the inlet and is isolated from the outlet. As the rotor rotates, the space in the casing separated by the blades which is in communication with the inlet is disconnected from the inlet. It then communicates with the outlet, so that the fluid in the space flows out from the outlet, so that the blades of the rotor as a sound insulation member can reduce the noise in the fluid.

8. The muffler device according to claim 7, wherein the fluid pipe connected to the inlet can be arranged in a direction substantially tangent to the cross-section circumference of the casing, so that the fluid flows in a direction substantially perpendicular to the radial direction after entering the casing. Therefore, the blade is driven to rotate, so that the muffler can still work without an external driving device.

9, a muffler device mounted on a fluid pipeline, comprising-a cylindrical housing (2);

A rotor with a circular cross section provided in the casing has a radius smaller than the radius of the inner cavity of the casing (2) and is tangent to the cylindrical inner wall of the casing; the rotor (3) has a flattened shape passing through its diameter. Two blades are inserted into the flat groove, and the two blades are connected by a spring. When the spring force is zero, the distance between the outermost ends of the two blades is greater than the diameter of the inner cavity of the shell. When pressed, it can be completely pressed into the rotor; the rotor can rotate about a rotation axis that passes through the center of its cross section perpendicularly, and is always tangent to the shell; during the rotation of the rotor, two outer parts of the two blades The end is always in close contact with the inner cavity wall of the housing, so the rotor and two blades divide the inner cavity of the housing (2) into three isolated parts; the inlet (1) and the outlet (4) provided on the housing are located at Both sides of the tangent point between the rotor and the inner wall of the housing are close to the tangent point;

The rotor can be driven by an external power device, and the rotation direction of the rotor is such that the blade rotates from the tangent point to the entrance direction.

10. The muffler according to claim 9, wherein, when the fluid pressure difference between the inlet and the outlet is large (the pressure at the inlet is stronger than the pressure at the outlet), the rotor is rotated due to the imbalance of the two blades, so that the rotor can be rotated without Use an external drive to rotate the rotor.

11. The muffler device according to claim 7 or 9, wherein the casing, the circular rotor, or the blades of the rotor are all made of double-layer plates, and the space between the double-layer plates is evacuated to achieve better sound insulation effects.

12. A muffler for a gas pipeline, including:

A shell,

An inlet (1) provided on the housing to allow gas to flow into the inner cavity of the housing, and an outlet (4) to allow gas to flow out of the inner cavity of the housing;

And a liquid located in the housing as a liquid sound insulation member;

• wherein the gas inlet is located below the liquid level, and at least a part of the gas pipeline before the inlet is located above the liquid level, so that liquid does not flow out of the casing;

The gas outlet is located above the liquid level.

13. The muffler according to claim 12, further comprising a flat plate-shaped screen having a plurality of small holes, the screen being disposed below the liquid surface and above the gas inlet.

A muffler according to claim 12 or 13, further comprising a layer of a non-volatile liquid added to said liquid.

15. The muffler device according to claim 12, further comprising a heat dissipation device installed on the intake pipe and the casing to reduce the temperature of the liquid in the casing.

16. A muffler for a liquid pipeline, comprising:

A shell,

An inlet (1) provided on the housing to allow liquid to flow into the inner cavity of the housing, and an outlet (4) to allow liquid in the inner cavity of the housing to flow out;

The inlet is located at or near the top of the housing, and the outlet is located at the bottom of the housing.

17. A method for reducing noise propagating along a fluid in a fluid pipeline, comprising: providing a housing;

An inlet is provided on the casing to allow fluid to flow into the inner cavity of the casing, and an outlet is provided to allow fluid to flow from the inner cavity of the casing;

A switch is provided in the housing to control the opening and closing of the inlet and outlet respectively, and the switch is set to continuously switch between the following two states: the state where the inlet is open and the outlet is closed, and the state where the inlet is closed and the outlet is opened, thereby The fluid can be continuously flowed through the muffler, and the switch can be used as a muffler to reflect the noise in the fluid, so as to achieve the effect of reducing noise.

18. A method for reducing noise propagating along a fluid in a fluid pipeline, comprising: providing a housing;

A rotatable member containing a plurality of blades is provided in the shell, and the rotatable member divides the inner cavity of the shell into a plurality of independent space parts that are not connected with each other, so that the inlet and the outlet are connected to different space parts at any time; '

Use an external driving device or rely on the thrust or pressure of the fluid to rotate the rotating member, so that the independent space portion communicating with the inlet is disconnected from the inlet, and then connected to the outlet; similarly, the original independent space portion communicating with the outlet and The outlet is disconnected and then connected to Rukou;

The above process is continuously circulated, so that the fluid can flow through the muffler, and at the same time, the rotating member as a sound insulation member can reduce noise in the fluid. -

19. A method for reducing noise propagating in a gas pipeline, including-providing a casing;

An inlet is provided on the casing to allow gas to enter the cavity of the casing, and an outlet is provided to allow gas to flow out from the cavity of the casing; Placing a liquid as a sound insulation member in the housing;

Position the gas inlet below the liquid level and the gas outlet above the liquid level.

20. A method for reducing noise propagating in a liquid pipeline, comprising: providing a casing;

An inlet is provided on the casing to allow liquid to enter the internal cavity of the casing, and an outlet is provided to allow liquid to flow from the internal cavity of the casing;

Place the liquid inlet on or near the top of the housing;

Set the liquid outlet on the bottom of the case.