A capsule muffler

Abstract

The present invention is a bladder-type silencer, comprising a silencer housing and a silencer airbag disposed within the silencer housing; the silencer airbag is connected at both ends with an air outlet pipe extending through the silencer housing, wherein the air outlet pipe at one end is connected to the air outlet of a corresponding diaphragm pump / piston pump, and the air outlet pipe at the other end is connected to the atmosphere or a working element capable of providing positive pressure; the silencer housing is connected at both ends with an air intake pipe, wherein the air intake pipe at one end is connected to the air intake of a corresponding diaphragm pump / piston pump, and the air intake pipe at the other end is connected to the atmosphere or a working element capable of providing negative pressure. The present invention has a simple and novel structure, can effectively reduce noise, greatly improve user experience, does not reduce flow rate, and can effectively prevent impurities from clogging the silencer, and has high practical value and promotion value.

Description

Technical Field

[0001] The present invention relates to the technical field of mufflers, and in particular to a capsule-type muffler. Background Art

[0002] Diaphragm / piston pumps are a representative type of pump. They utilize a motor to drive the reciprocating motion of a diaphragm to create a vacuum, thereby drawing in and expelling fluid. Diaphragm / piston pumps offer high efficiency, complete isolation of the moving mechanism from the conveying medium, and no contamination to the medium. They are non-dynamically sealed, leak-proof, and highly reliable. Their compact size and light weight ensure no idling, and they require no lubrication or maintenance. These numerous advantages have led to their widespread use in the instrumentation industry. During operation, diaphragm / piston pumps continuously generate fluid pressure pulses, which in turn induce vibrations in components such as the pump body, valves, and piping, generating radiated noise. According to actual measurements by researchers, fluid dynamic noise is the main noise of diaphragm pumps / piston pumps; when inhaling, the inlet valve opens and the outlet valve closes, air is sucked into the pump chamber, and violent pressure fluctuations occur in the inlet and valve chamber. The pressure fluctuations of the gas radiate from the inlet in the form of sound waves, forming inlet noise; when exhausting, the inlet valve closes and the outlet valve opens, the air expands, and the air flow quickly flows through the outlet to generate sound waves to form exhaust noise, which seriously affects the user experience when used in diaphragm pumps and piston pump equipment.

[0003] In the existing technology, silencers are mainly divided into six categories: resistive silencers, reactive silencers, impedance composite silencers, micro-perforated plate silencers, small hole silencers and active silencers. Resistive silencers utilize porous sound-absorbing materials to reduce noise, fixed to the inner wall of the airflow channel or arranged in a specific pattern within the duct. Reactive silencers utilize impedance changes caused by sudden changes in the duct cross-section or by adjacent resonant cavities, resulting in reflection and interference of sound energy, thereby reducing the sound energy radiated outward from the silencer. Impedance composite silencers combine the muffler principles of resistive and reactive silencers through an appropriate structure, combining the muffler characteristics of both. Microperforated plate silencers have an aperture of less than 1mm, significantly increasing their acoustic resistance compared to conventional perforated plates. Their low porosity widens the sound absorption band, while a suitable back-plate depth improves the location of the resonant absorption peak. Small-hole silencers shift the jet noise spectrum toward higher frequencies by passing air through small holes, reducing the audible sound component within the spectrum and thereby minimizing noise interference and harm to humans. Active silencers eliminate noise by using a computer-controlled electronic sound generator to generate interference sound waves that match the frequency and intensity of the noise to be eliminated, but have an opposite phase.

[0004] Mufflers are commonly used to reduce noise at the inlet and outlet of various aerodynamic equipment or along pipelines. Diaphragm pumps / piston pumps are primarily silenced using the following techniques: ① Connecting a sintered muffler to the exhaust nozzle; ② Inserting the exhaust nozzle into a muffler containing silencer cotton. However, both of these muffler methods have two fatal flaws: ① They both reduce the flow rate of the diaphragm / piston pump; ② During operation, as moisture and impurities accumulate, they cannot be discharged and clog the muffler, significantly reducing the flow rate of the diaphragm / piston pump, ultimately causing the diaphragm / piston pump to malfunction.

[0005] Based on the above-mentioned deficiencies of the silencer, the present invention proposes a capsule-type silencer to solve the problems of poor silencing effect, reduced flow rate and impurities clogging the silencer. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems existing in the prior art and provide a capsule type silencer.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A bag-type silencer comprises a silencer shell and a silencer air bag arranged in the silencer shell;

[0009] Both ends of the silencer airbag are connected to an air outlet pipe passing through the silencer housing, wherein the air outlet pipe at one end is connected to the air outlet of the corresponding diaphragm pump / piston pump, and the air outlet pipe at the other end is connected to the atmosphere or a working component that can provide positive pressure;

[0010] Both ends of the silencer housing are connected to suction pipes respectively, wherein the suction pipe at one end is connected to the suction port of the corresponding diaphragm pump / piston pump, and the suction pipe at the other end is connected to the atmosphere or a working element that can provide negative pressure.

[0011] Furthermore, a plurality of isolation columns are evenly distributed on the inner wall of the noise-reducing shell to prevent the noise-reducing airbag from being completely attached to the inner wall of the noise-reducing shell, thereby preventing the air passage in the noise-reducing shell from being blocked.

[0012] Furthermore, a drain port is provided at the bottom or side of the sound-absorbing shell to discharge condensed water formed in the sound-absorbing shell.

[0013] Furthermore, the noise-absorbing shell is composed of a front shell and a rear shell that are split and snap-fitted together.

[0014] Furthermore, the noise-absorbing shell is a hard, sealed structure that is not easily deformed, and the noise-absorbing airbag is an elastic, sealed airbag structure.

[0015] The beneficial effects of the present invention are:

[0016] The present invention has a simple and novel structure, can effectively reduce noise, greatly improve user experience, will not reduce flow, and can effectively prevent impurities from clogging the muffler. It has high practical value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing the internal structure of the muffler of the present invention;

[0018] Figure 2 This is a structural diagram of the inner side of the silencer shell of the silencer of the present invention;

[0019] Figure 3 This is a diagram of the external structure of the muffler of the present invention;

[0020] Figure 4 This is a semi-neutralized waveform diagram of the gas flow noise of a single-head diaphragm pump / piston pump using the silencer of the present invention;

[0021] Figure 5 This is a waveform diagram showing the complete neutralization of the gas flow noise of a double-head diaphragm pump / piston pump by the silencer of the present invention.

[0022] Explanation of the numbers in the figure: 1. Silencer shell, 11. Isolation column, 12. Drain port, 2. Silencer airbag, 3. Exhaust pipe, 4. Intake pipe. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figure 1 As shown, a bag-type silencer comprises a silencer shell 1 and a silencer airbag 2 arranged in the silencer shell 1;

[0025] Both ends of the silencer airbag 2 are connected to an air outlet pipe 3 passing through the silencer housing 1. The air outlet pipe 3 at one end is connected to the air outlet of the corresponding diaphragm pump / piston pump, and the air outlet pipe 3 at the other end is connected to the atmosphere or a working component that can provide positive pressure.

[0026] Both ends of the silencer housing 1 are connected to an air intake pipe 4, wherein the air intake pipe 4 at one end is connected to the air intake port of the corresponding diaphragm pump / piston pump, and the air intake pipe 4 at the other end is connected to the atmosphere or a working component that can provide negative pressure.

[0027] like Figure 2 As shown, a number of isolation columns 11 are evenly distributed on the inner wall of the silencer housing 1 to prevent the silencer airbag 2 from being completely attached to the inner wall of the silencer housing 1 and causing the airway in the silencer housing 1 to be blocked. This is because when the pressure in the silencer airbag 2 increases, the airbag expands. In extreme cases, if the silencer airbag 2 expands excessively and the airbag wall is tightly attached to the silencer housing 1, the gas flow in the cavity of the silencer housing 1 will be hindered.

[0028] like Figure 3 As shown, a drain port 12 is provided at the bottom or side of the silencer housing 1 to discharge condensed water formed in the silencer housing 1. This is because when the diaphragm pump / piston pump extracts water-rich gas, condensed water will be generated in the silencer housing 1. The condensed water gathers at the bottom or side of the silencer housing 1 and can be discharged from the drain port 12 at this time, so as not to affect the silencer effect.

[0029] The silencer housing 1 is composed of a front shell and a rear shell that are split and snap-fitted together. In this embodiment, the overall shape of the silencer housing 1 is a rectangular box. The holes at both ends of the silencer housing 1 for passing the air outlet pipe 3 are arranged diagonally to each other. Similarly, the holes at both ends of the silencer housing 1 for passing the air intake pipe 4 are also arranged diagonally to each other to form a cross air path, thereby maximizing the utilization of the chamber of the silencer housing 1.

[0030] The noise-absorbing shell 1 is a hard, sealed structure that is not easily deformed, and the noise-absorbing airbag 2 is an elastic, sealed airbag structure.

[0031] Action process and principle of the present invention

[0032] like Figure 4 As shown, for a single-head diaphragm pump / piston pump: when inhaling, the air inlet valve opens and the air outlet valve closes, air is sucked into the pump chamber, and negative pressure is formed in the cavity of the silencer shell 1. The silencer airbag 2 in the cavity of the silencer shell 1 expands under the action of the negative pressure, buffering the violent pressure fluctuations in the cavity of the silencer shell 1 and reducing noise; when exhausting, the air inlet valve closes and the air outlet valve opens, the air expands, the internal pressure of the silencer airbag 2 increases, the airbag expands, buffering the violent pressure fluctuations in the cavity of the silencer shell 1 and reducing noise.

[0033] like Figure 5 As shown, for a double-headed diaphragm pump / piston pump: the pump is composed of two symmetrical pump chambers. When one chamber is inhaling, the other chamber is in exhaust state, and the suction and exhaust are carried out simultaneously; the cavity of the silencer housing 1 is formed as shown in FIG. Figure 5 The negative pressure waveform in the silencing airbag 2 increases the pressure. Figure 5 As shown in the exhaust waveform; when inhaling, negative pressure is formed in the cavity of the silencer shell 1, and the silencer airbag 2 in the cavity of the silencer shell 1 expands under the action of the negative pressure, buffering the violent pressure fluctuation in the cavity of the silencer shell 1 and reducing noise; when exhausting, the pressure in the silencer airbag 2 increases, the airbag expands, buffering the violent pressure fluctuation in the silencer airbag 2 and reducing noise. Since the intake and exhaust are carried out simultaneously, the outside of the airbag is at negative pressure and the inside of the airbag is at positive pressure. The degree of expansion of the airbag is much greater than that of a single-head pump, and the corresponding gas pressure fluctuation will be smaller, and the noise will also be smaller. In addition to using the expansion and deformation of the airbag to reduce gas pressure fluctuation and control noise in the double-head diaphragm pump / piston pump, the silencer of the present invention can also reduce the noise. Figure 5It can be seen from the intake noise and exhaust waveforms that the frequency and intensity of the negative pressure noise in the cavity of the silencer shell 1 and the positive pressure noise in the silencer airbag 2 are equal, but the phases are opposite. The two interfere and neutralize perfectly, which greatly reduces the noise.

[0034] Figure 4 and Figure 5 The waveform is the waveform that appears on the oscilloscope when the noise source speaks into the microphone.

[0035] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A capsule muffler, characterized in that: It comprises a noise-absorbing shell (1) and a noise-absorbing airbag (2) arranged in the noise-absorbing shell (1); Both ends of the silencer airbag (2) are connected to an air outlet pipe (3) passing through the silencer housing (1), wherein the air outlet pipe (3) at one end is connected to the air outlet of the corresponding diaphragm pump / piston pump, and the air outlet pipe (3) at the other end is connected to the atmosphere or a working element capable of providing positive pressure; Both ends of the silencer housing (1) are connected to suction pipes (4), wherein the suction pipe (4) at one end is connected to the suction port of the corresponding diaphragm pump / piston pump, and the suction pipe (4) at the other end is connected to the atmosphere or a working element capable of providing negative pressure.

2. The capsule muffler according to claim 1, characterized in that: A plurality of isolation columns (11) are evenly distributed on the inner wall of the silencer housing (1) to prevent the silencer airbag (2) from completely adhering to the inner wall of the silencer housing (1) and causing the airway in the silencer housing (1) to be blocked.

3. The capsule muffler according to claim 2, characterized in that: A drain port (12) is provided at the bottom or side of the silencer housing (1) for draining condensed water formed in the silencer housing (1).

4. The capsule muffler according to claim 3, characterized in that: The noise-absorbing housing (1) consists of a front housing and a rear housing that are split and snap-fitted together.

5. The capsule muffler according to claim 4, characterized in that: The silencer shell (1) is a hard, sealed structure that is not easily deformed, and the silencer airbag (2) is an elastic, sealed airbag structure.

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