KR100269373B1 - device for low noise of qneumatic installation - Google Patents

Abstract

PURPOSE: A noise reduction apparatus for pneumatic system is provided to achieve a simplified structure by reducing, through the single noise reduction unit, the noise of air being discharged from the pneumatic system. CONSTITUTION: A noise reduction apparatus comprises a cylindrical main body(101) having open both ends; a plurality of inlet ports(102) formed along the circumference of the body and connected to an air exhaust passage(6) of a pneumatic system; a suction side sound absorbing member arranged to contact the inner periphery of the main body; caps(104) coupled to both ends of the main body and arranged to be attachable/detachable from both ends of the main body; a plurality of outlet ports(105) formed at each of caps; and a discharge side sound absorbing member(106) arranged to contact the inner periphery of each cap.

Description

Noise reduction device for pneumatic installations {device for low noise of qneumatic installation}

The present invention relates to the field of pneumatic equipment for operating various production facilities of the factory by air pressure, and more particularly, to reduce the noise of the pneumatic equipment to reduce the noise generated in the process of air discharged after operating the production equipment Relates to a device.

In general, the factory is equipped with a variety of automated production facilities to produce a product, a conveyor system for automatically moving the product to the next process to assemble the product of the production equipment or assembled products Most production facilities that produce relatively light weight products, such as packaging machines for automatic packaging, are operated by pneumatic equipment.

So let's look first at the pneumatic equipment that supplies air to operate the production equipment.

1 and 5, the pneumatic equipment includes a pump 1 for pumping air at high pressure, a main air supply path 2 for supplying high pressure air pumped by the pump, and the main air supply. Auxiliary air supply path (3) for dividing and supplying the air supplied through the furnace in several ways, and for the air supply path installed on each auxiliary air supply path to selectively open and close the auxiliary air supply path (3) A plurality of cylinders 5 for receiving high pressure air through the on / off valve 4, the auxiliary air supply paths 3, and an air discharge path 6 for discharging the air supplied into the cylinders, respectively; And on / off valves 7 for air exhaust passages installed on the respective air exhaust passages to selectively open and close the air exhaust passages 6, and installed in the respective cylinders 4 according to the supply and discharge of air. Reciprocating movement within a certain stroke range It consists of a piston 8.

In the pneumatic equipment configured as described above, when the pump 1 is operated, high pressure air is generated, and the generated high pressure air is branched into the main air supply passage 2 and the main air supply passage. Continuously guided through the supply passage (3), in this case, the air supply passage opening and closing valve (4) installed on each of the auxiliary air supply passage (3) is opened and at the same time the air installed on each air discharge passage (6) In consideration of the closing of the outlet valve 7 for air, the air guided to each auxiliary air supply path 3 is supplied into each cylinder 5, whereby the piston 8 installed in each of the cylinders reaches a top dead center. Move.

Immediately after the piston 8 in each cylinder 5 is moved to the top dead center, the air outlet passage opening / closing valve 7 installed on each air exhaust passage 6 is opened and at the same time each auxiliary air supply passage 3 Since the on / off valve 4 for the air supply path installed on the air supply line is closed, the air supplied into each of the cylinders 5 is guided to the air exhaust paths 6 and discharged. 8) Move back to the bottom dead center.

By the above-mentioned action, the cycle in which the piston 8 installed in each cylinder 5 reciprocates the top dead center and the bottom dead center once is referred to as a tack time of a production line. During the tack time, a production facility such as a wrapping machine is given a working force to complete a process.

As described above, when the high pressure air supplied to each cylinder 5 of the pneumatic equipment is guided and discharged to each air exhaust passage 6 in the process of repeating the tack time of the production equipment, the exhaust noise is greatly generated. Therefore, in the production site, it is necessary to provide a pleasant working environment by reducing the air discharge noise caused by the operation of the pneumatic equipment. For this purpose, a noise reduction device for lowering the discharge noise of the air to meet the standard value is provided. Equipped.

The conventional structure of the noise reduction device is a metal or resin material of high hardness, as shown in Figs. 1 to 4, the inlet part is opened and the end part is closed, so that the inlet part is for each air discharge path 6 of the pneumatic equipment. Body 11 detachably coupled, a plurality of outlets 12 formed on the circumferential surface of each body, and the sound absorbing material 13 is installed in a state in contact with the inner circumferential surface of each of the body 11 Consists of

Therefore, when the high-pressure air supplied at the time of operation of the pneumatic equipment is guided and discharged to each air discharge passage 6, the discharged air is the body in which the inlet is detachably coupled to each air discharge passage 6, respectively ( 11) enter into, and the discharged air passes through the sound absorbing material 13 installed in contact with the inner circumferential surface of each of the bodies 11, and then the outlets 12 formed on the circumferential surfaces of the respective bodies 11, respectively. Out through the outside, the noise in the exhaust air is part of the sound is absorbed in the process of the exhaust air passing through the sound absorbing material 13 is eventually reduced by the sound absorbing material is absorbed by the sound absorbing material is reduced. .

The noise reduction device that acts like this will end its life due to various factors (especially the sound absorbing material will not be able to play a role) after a certain period of time. In this case, the noise reduction device should be replaced with a new noise reduction device. Each air outlet 6 of the pneumatic installation should separate the body 11 coupled with the inlet and then combine the body that constitutes a new noise reduction device.

On the other hand, the cross-sectional area of the outlet 12 constituting the conventional noise reduction device and the thickness of the sound absorbing material 13 are not particularly taken into consideration, and the discharge air having a pressure of 5 to ⁶ kg / Cm ² coming into the body 11 is in the body. It is designed only to be discharged through the outlet 12 without receiving a back pressure at, the limit of the pressure of the exhaust air entering the body 11 to 5 ~ 6kg / Cm ² is usually a pneumatic equipment is a light weight production equipment This is because it is applied only to the operation, and the maximum discharge air pressure when the pneumatic equipment operates the light weight production equipment for a tack time is 5 to 6 kg / Cm ² .

However, the conventional noise reduction device of such a pneumatic facility has the following problems.

First, in the pneumatic installation, one independent noise reduction device is provided for each air exhaust path which exhausts the air supplied into each cylinder when the piston in each cylinder moves to the bottom dead center. Considering that the number of the noise reduction device is too large structurally complex.

Second, since the noise is reduced by only one sound absorbing material, oil is injected into the cylinder of the pneumatic equipment for lubrication of the piston, and the injected oil is partially discharged along with the air discharge. As it is easily blocked by the sound absorbing performance is quickly dropped.

Third, when the sound absorbing material is contaminated and the performance of the sound absorbing material is not fulfilled, only the sound absorbing material can not be replaced. Therefore, the total cost of the noise reduction device must be replaced.

Fourth, the outlet, which is the passage through which the exhaust air into the body escapes to the outside, serves only as a passage for air discharge, so the high frequency of about 4000Hz to 16000Hz, which is the address sound source, cannot be removed properly. More than 90dB will often be exceeded.

The present invention has been made in order to solve the above-mentioned conventional problems, by reducing the air discharged through each air discharge path of the pneumatic equipment by one noise reduction device to simplify the overall structure while the noise of the air discharge The purpose of the noise reduction is to increase the noise reduction effect through several steps, and to maintain the noise reduction efficiency even after long use.

According to the present invention for achieving the above object, in the pneumatic equipment for supplying the high pressure air pumped by the pump and giving the operating force to the production equipment while discharging the supplied air, both sides are opened in communication A cylindrical body, a plurality of inlets formed on the circumferential surface of the body and connected to each air exhaust passage of the pneumatic equipment, and installed on the suction side sound absorbing material in contact with the inner circumferential surface of the body, and on both sides of the body. There is provided a noise reduction device for a pneumatic installation comprising a cap detachably coupled, a plurality of outlets formed in the cap, and a discharge side sound absorbing material provided in contact with an inner surface of each cap.

1 is a state diagram equipped with a conventional noise reduction device in a pneumatic facility system

Figure 2 is a perspective view of the main portion showing a conventional noise reduction device of pneumatic installation

Figure 3 is a longitudinal cross-sectional view showing the main part of the conventional noise reduction device of the pneumatic equipment

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a state diagram equipped with the present invention noise reduction device in the pneumatic equipment system

6 is an exploded perspective view showing main parts of the present invention for reducing noise of a pneumatic equipment;

Figure 7 is a longitudinal sectional view showing the noise reduction device of the present invention of the pneumatic equipment

8 is a cross-sectional view taken along the line B-B of FIG.

Explanation of symbols for main parts of the drawings

1. Pump 6. Air exhaust furnace

101.Body 102.Inlet

103. Suction absorber 104. Cap

105. Outlet 106. Outlet sound absorbing material

107.O-Ring

Hereinafter, the present invention will be described in more detail with reference to the attached FIGS. 5 to 8 as an embodiment.

5 is a state diagram in which the present invention noise reduction device is equipped with a pneumatic installation system, and FIG. 6 is an exploded perspective view of a main portion of the present invention for reducing noise of a pneumatic installation, and FIG. FIG. 8 is a cross-sectional view taken along line BB of FIG. 7. The present invention is a cylindrical body 101 having both sides open in communication with a soft thermoplastic material, and a pneumatic pressure formed on a circumferential surface of the body. It is installed in contact with the plurality of inlets 102 and the inner peripheral surface of the body 101, respectively, connected to each air exhaust passage 6 of the equipment, its thickness is 25-35mm and the density is 25-35kg / m ^{A three-} person suction side sound absorbing material 103, a cap 104 detachably screwed to both sides of the body 101, and formed in the cap so that the total cross-sectional area is equal to or larger than the total cross-sectional area of the inlet 102. And each of which has a diameter of 5 mm or less Outlet 105, the installed in contact with the inner surface of each cap 104, and its thickness is 25~35mm a density of a density of 25~35kg / m ³ in the exhaust side sound absorbing material (106), said body It consists of an O-ring 107 which is sandwiched between both side ends of the 101 and the inner side surface of each cap 104 to maintain airtightness.

According to the present invention configured as described above, the air discharged by being guided to each air discharge passage 6 of the pneumatic equipment is formed on the circumferential surface of the body 101 to provide a plurality of inlets 102 respectively connected to the respective air discharge passages 6. Through the inside of the body 101, in this process the noise in the exhaust air is reduced to some extent.

As such, the air entering the body 101 is detachably screwed to the cap 104 on both sides of the body, and the plurality of outlets 105 are formed in each cap to the outside through the respective outlets. As it exits, the noise of the exhaust air is again reduced in part.

Hereinafter, the air discharged and guided into each of the air discharge paths 6 of the pneumatic equipment into the body 101 enters the air, and the air in the air is completely escaped to the outside of the body 101 until the noise in the air is reduced. The process of more specifically is as follows.

Air entering the inside of the body 101 through each inlet 102 formed on the circumferential surface of the body 101 passes through the suction side sound absorbing material 103 installed in contact with the inner circumferential surface of the body, and the suction side sound absorbing material. Some of the noise in the air is absorbed by the air, and the air in which the noise is primarily reduced is continuously passed through the space part inside the body 101. Therefore, the noise in the air is secondarily reduced by the resonance effect. do.

The air whose noise is reduced first and second in this manner continues to pass through the discharge side sound absorbing material 106 installed while being in contact with the inner surface of each cap 104, and some of the noise in the air is absorbed by the discharge sound absorbing material. And thirdly removed, the third noise-reduced air goes through each outlet 105 and undergoes a fourth reduction in which high-frequency sound waves are removed. Until it exits the body, the noise in the air is reduced in stages throughout the primary, secondary, tertiary and quadratic phases, which greatly widens the overall noise reduction.

When the air entered into the body 101 exits the exit 105 formed in each cap 104, the high-frequency sound waves of the air are removed and the fourth noise reduction is achieved. diameter is possible because it is less than 5mm, it is actually the discharge pressure of all the pneumatic equipment to impart operation force to the production equipment in the main causes of noise in the exhaust air pressure of the drug 5~6kg / Cm ² given that about 5~6kg / Cm ² This is because high frequency sound waves of 4000 to 16000 Hz are generated, but these high frequency sound waves cannot escape to an outlet having a diameter of 5 mm or less.

That is, since the high frequency sound waves of 4000 to 16000 Hz have a small wavelength, when the diameter of each outlet 105 is 5 mm or more, the high frequency sound waves simply leak out to the outside through the outlet. Because of this, high frequency wavelengths are removed, resulting in fourth-order noise reduction.

On the other hand, in the present invention, the suction side sound absorbing material 103 for primarily reducing the noise of the air entering the body 101, and the discharge side sound absorbing material 106 for reducing the third, the thickness is 25 to 35mm, the density is 25 to 35 kg / m ³ , which is used in the process of passing the air discharged from the pneumatic equipment at a pressure of ⁵ to 6 kg / Cm ^{2 through} the suction side sound absorbing material 103 and the discharge side sound absorbing material 106. The pressure ratio was found by experiment, and the criterion that the noise reduction effect of the air was the most excellent but the back pressure was not generated was 25 to 35 mm thick and the density was 25 to 35 kg / m ³ .

If the suction side sound absorbing material 103 and the discharge side sound absorbing material 106 has a thickness of 25 mm or less and a density of 25 kg / m ³ or less, the air entering the body 101 passes through the suction side sound absorbing material 103 too quickly and Together with the air exiting the body 101 passes through the discharge side sound absorbing material 106 too quickly, the noise reduction rate of the air by the suction side sound absorbing material 103 and the discharge side sound absorbing material 106 is lowered, the suction side sound absorbing material 103 ) And the discharge side sound absorbing material 106 has a thickness of 35 mm or more and a density of 35 kg / m ³ or more, the air entering the body 103 passes through the suction side sound absorbing material 103 too slowly and exits the body 101. The outgoing air passes through the discharge side sound absorbing material 106 so slowly that back pressure is applied and the tack time of the production equipment by the pneumatic equipment is affected. Each sound absorbing material 103 and 106 has a thickness of 30 mm and a density of 30 kg. / m ³ be when The desirability can be understood.

In addition, the body 101, which is a component of the present invention, is a thermoplastic resin having a soft and resilient material, so that air enters the body 101 and then exits to the outside. It can be seen that the body 101 slightly absorbs the vibration generated when the noise reduction process is performed, and thus the noise reduction effect according to the present invention is further improved by changing the material of the body 101.

Air entering the body 101 in the process of reducing the noise of the pneumatic equipment through the operation as described above maintains a high pressure, so the air is screwed to the cap 104 of both sides of the body 101 However, the O-ring 107 is inserted between the body 101 and each cap 104 to maintain airtightness, so that air is actually introduced into the gap between the body 101 and each cap 104. There is no leakage, and thus no noise is generated due to external leakage of air that enters the body 101.

Then, when the pneumatic equipment operating the prior art and the present invention, respectively, the noise level generated by the discharge of the supplied air as a result of measuring about 85 to 95 dB in the prior art, but 70 to 80 dB in the present invention, so the present invention It can be seen that the noise due to the operation of the pneumatic equipment to which the noise reduction device is applied is reduced by about 15 dB compared to the noise due to the operation of the pneumatic equipment to which the conventional noise reduction device is applied.

On the other hand, if the noise reduction device of the present invention is used for a long time, even if the suction side sound absorbing material 103 for reducing the primary noise is contaminated due to the oil used for smooth movement of the piston constituting the pneumatic equipment, the role thereof is not sufficient. Since the suction side sound absorbing material is only one element of the four elements for reducing the noise of the present invention, there is no problem in that the noise reduction rate is lowered more than necessary even when the suction side sound absorbing material 103 is contaminated.

In addition, the suction side sound absorbing material 103 for reducing the noise of the air discharged primarily as described above and the discharge side sound absorbing material 106 for reducing the noise in the third should be replaced with a new sound absorbing material when the service life of the exhausted end of life. In this case, the cap 104, which is screwed to both sides of the body 101, is rotated and separated, and then the sound absorbing material, which has reached the end of its life, is replaced with a new sound absorbing material, and then the cap 104, which has been separated, is replaced with Since screwing on both sides, there is no inconvenience to replace the entire noise reduction device as in the prior art.

As described above, the present invention is structurally simple because it reduces the noise in the discharged air while collecting the air discharged from each air discharge of the pneumatic equipment at the same time and passing through one integrated noise reduction device. As the noise in the air is reduced through several stages, the high frequency of about 4000Hz ~ 16000Hz, which has a small wavelength of noise source, is properly removed, and the overall noise reduction rate is greatly improved. Third, when the suction side sound absorbing material and the discharge side sound absorbing material are contaminated by the air discharged along with the discharged air and the noise reduction rate decreases, only the suction side sound absorbing material and the discharge side sound absorbing material need to be replaced with a new sound absorbing material. There are various effects such as shrinking.

Claims (8)

Pneumatic equipment which is supplied with high pressure air pumped by the pump and discharges the supplied air through the air discharge path, and gives an operating force to the production equipment, and noise in the introduced air by introducing air discharged from the pneumatic equipment. In the noise reduction device for reducing the The noise reduction device includes a hollow cylindrical body; A plurality of inlets formed in the body and connected to air discharge passages respectively formed in the plurality of pneumatic facilities, for introducing air discharged from the pneumatic facilities; A sound absorbing material installed on an inner circumferential surface of the body to absorb noise in the air sucked into the body; The noise reduction device of the pneumatic equipment, characterized in that made in the body comprises a discharge outlet: air is reduced by the suction side sound absorbing material is reduced. In the pneumatic equipment for supplying the high pressure air pumped by the pump and discharging the supplied air to give the operating power to the production equipment, the cylindrical body with both sides open in communication with, A plurality of inlets formed on the circumferential surface of the body and connected to each air exhaust passage of the pneumatic equipment; A suction side sound absorbing material installed in contact with an inner circumferential surface of the body, A cap detachably coupled to both sides of the body, A plurality of outlets formed in the cap, Noise reduction device of the pneumatic equipment, characterized in that consisting of the discharge side sound absorbing material installed in contact with the inner surface of each cap. The method of claim 2, Noise reduction device of pneumatic equipment, characterized in that the material of the body is thermoplastic resin. The method of claim 2, The noise reduction device of the pneumatic installation, characterized in that the cap is detachable in a state coupled to both sides of the body by screwing the cap on both sides of the body. The method according to claim 2 or 4, Noise reduction device of the pneumatic installation, characterized in that the O-ring is inserted between the body and the cap coupled to both sides of the body to maintain the airtight. The method of claim 2, Noise reduction device of the pneumatic installation, characterized in that the sum of the total cross-sectional area of each outlet formed on both side caps of the body is equal to or greater than the sum of the total cross-sectional area of the inlet formed on the body. The method according to claim 2 or 6, Noise reduction device of the pneumatic equipment, characterized in that the diameter of each outlet formed on both side caps of the body is 5mm or less. The method of claim 2, The noise reduction device of the pneumatic installation, characterized in that the thickness of the suction-side sound absorbing material and the discharge-side sound absorbing material is 25 to 35 mm and the density is 25 to 35 kg / {m} ^ {3}.