KR20230124862A - Apparatus for reducing noise and compressor including the same - Google Patents

Abstract

The present invention relates to a noise reduction device, and more particularly, to a noise reduction device capable of reducing noise generated by vibration of a casing and a compressor to which the same is applied. This present invention, in the noise reduction device, a vibration generating source; a casing connected to the vibration generating source by a support; and a reinforcing plate installed in contact with at least one surface of the casing, wherein the reinforcing plate has a second curvature different from the first curvature of the one surface, and is elastically deformed to have the first curvature. can be installed by contacting
The noise reduction device to which the reinforcing plate is applied can reduce noise caused by the vibration mode by the action of damping reinforcement and rigidity reinforcement.

Description

Noise reduction device and compressor to which it is applied {Apparatus for reducing noise and compressor including the same}

The present invention relates to a noise reduction device, and more particularly, to a noise reduction device capable of reducing noise generated by vibration of a casing and a compressor to which the same is applied.

In the case of a mechanical device composed of a casing in which a vibration generating source is installed therein, noise due to vibration may generally be generated.

Such noise may be generated when vibration caused by a vibration source inside the casing excites the external casing.

Also, noise may be generated by the structural mode of the casing itself. That is, noise may be added due to vibration caused by the natural frequency of the casing.

For example, when the vibration generating source is a mechanical element that rotates or reciprocates, the vibration caused by the rotational or reciprocating motion excites the casing, and thus vibration noise may be generated.

That is, the natural vibration characteristics of the casing itself may be amplified by an external excitation force, resulting in greater noise. In general, when the vibration caused by the excitation force overlaps with the natural frequency of the casing, a resonance phenomenon in which the amplitude is doubled may occur.

When such a resonance phenomenon occurs, noise may greatly increase. That is, according to this phenomenon, the noise of the corresponding frequency is generated high.

Specifically, the compressor includes a piston that reciprocates by the rotational force of the motor, and this piston motion causes vibration of the compressor casing, thereby generating vibration noise.

However, noise reduction methods used so far have been limited to reducing the excitation force by reinforcing the spring used in the support of the compressor or adding a structure, and noise reduction by these methods does not fundamentally prevent the cause of noise. There was a limit because I couldn't.

Therefore, a method to solve this problem is required.

A technical problem to be achieved by the present invention is to provide a noise reduction device capable of reducing noise by controlling vibration by the vibration mode by analyzing the vibration mode of the casing itself and a compressor to which the same is applied.

In addition, according to the present invention, it is intended to provide a noise reduction device capable of reducing noise caused by a vibration mode by the action of damping reinforcement and rigidity reinforcement, and a compressor to which the same is applied.

As a first aspect for achieving the above technical problem, the present invention, in the noise reduction device, a vibration source; a casing connected to the vibration generating source by a support; and a reinforcing plate installed in contact with at least one surface of the casing, wherein the reinforcing plate has a second curvature different from the first curvature of the one surface, and is elastically deformed to have the first curvature. can be installed by contacting

The noise reduction device to which the reinforcing plate is applied can reduce noise caused by the vibration mode by the action of damping reinforcement and rigidity reinforcement.

In addition, the reinforcing plate may include a plurality of unit plates provided by being stacked.

In addition, the one surface may be an upper surface of the casing, and the first curvature may be a main curvature of the upper surface.

In addition, the reinforcing plate may have a first structure for reducing vibration of the first vibration mode and the second vibration mode of the casing.

In addition, the first structure may include a shape formed along a vertical direction of the longitudinal direction of the upper surface.

In addition, the reinforcing plate may have a second structure for reducing vibration of the first vibration mode to the third vibration mode of the casing.

In addition, the second structure may include a first portion formed along a vertical direction of the longitudinal direction of the upper surface and a second portion extending from the first portion to one side of the longitudinal direction.

In addition, the second structure may include a third portion extending from the first portion in a direction opposite to the second portion.

In addition, the reinforcing plate may be installed on at least one of inner and outer surfaces of the upper surface.

In addition, the reinforcing plate may be installed on a side surface or a lower surface of the casing.

Also, the second curvature may be smaller than the first curvature.

In addition, the vibration generating source may include a compressor.

In addition, the compressor, a mechanical unit that causes vibration by the rotational motion; a motor providing rotational force to the mechanism; and a support portion supporting at least one of the mechanical portion and the motor and connected to the casing.

In addition, the mechanism unit, a cylinder block including a cylinder; a rotational shaft including an eccentric that rotates by the rotational force of the motor; and a piston connected to the rotating shaft and reciprocating in the cylinder by the eccentric part.

As a second aspect for achieving the above technical problem, the present invention, the outer casing; a mechanical unit installed in the outer casing to generate vibration by rotational motion; a motor providing rotational force to the mechanism; a support portion supporting at least one of the mechanical portion and the motor and connected to the casing; and a reinforcing plate that is installed in contact with at least one surface of the outer casing, has a second curvature different from the first curvature of the one surface, and is elastically deformed to have the first curvature.

The compressor to which such a reinforcing plate is applied can reduce noise caused by a vibration mode by the action of damping reinforcement and rigidity reinforcement.

According to the present invention, there are the following effects.

First, by analyzing the vibration mode of the casing itself, it is possible to reduce noise by controlling the vibration by the vibration mode.

In addition, noise due to the vibration mode can be reduced by the action of damping reinforcement and rigidity reinforcement according to the analysis of the vibration mode.

1 is a schematic cross-sectional view showing a noise reduction device according to an embodiment of the present invention.
2 and 3 are cross-sectional schematic views showing the coupling structure of the reinforcing plate of the noise reduction device according to the first embodiment of the present invention.
4 and 5 are cross-sectional schematic views showing a coupling structure of a reinforcing plate of a noise reduction device according to a second embodiment of the present invention.
6 and 7 are cross-sectional schematic views showing the coupling structure of the reinforcing plate of the noise reduction device according to the third embodiment of the present invention.
8 is a cross-sectional view showing an example of a compressor to which the present invention can be applied.
9 to 11 are diagrams showing analysis results of the main vibration modes of the compressor casing.
12 is a graph showing noise measurement results of a compressor casing.
13 is an actual spectrum showing noise measurement results of a compressor casing.
14 is a diagram showing the maximum vibration position for each main vibration mode of the compressor casing.
15 is a schematic graph showing the concept of damping reinforcement of a reinforcing plate.
16 is a schematic graph showing the concept of rigidity reinforcement of a reinforcing plate.
17 is a graph showing frequency response characteristics according to the number of stacked reinforcing plates.
18 is a perspective view showing a compressor casing equipped with a reinforcing plate according to the first embodiment of the present invention.
19 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a second embodiment of the present invention.
20 is a graph showing noise measurement results in a compressor casing equipped with a reinforcing plate according to the first embodiment of the present invention.
21 is an actual spectrum showing noise measurement results in a compressor casing equipped with a reinforcement plate according to the first embodiment of the present invention.
22 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a third embodiment of the present invention.
23 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a fourth embodiment of the present invention.
24 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a fifth embodiment of the present invention.
25 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a sixth embodiment of the present invention.
26 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a seventh embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

While the present invention is susceptible to various modifications and variations, specific embodiments thereof are shown by way of illustration in the drawings and will be described in detail below. However, it is not intended to limit the present invention to the particular form disclosed, but rather the present invention includes all modifications, equivalents and substitutions consistent with the spirit of the present invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being “on” another element, it may be directly on the other element or intervening elements may exist. .

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and/or regions, these elements, components, regions, layers and/or regions It will be understood that one should not be limited by these terms.

1 is a schematic cross-sectional view showing a noise reduction device according to an embodiment of the present invention.

Referring to FIG. 1 , the noise reduction device includes a structure for reducing noise caused by vibration generated from a vibration generating source 100 . Here, for convenience, the vibration generating source 100 is also described as a part of the noise reduction device.

The vibration generating source 100 may be installed in a casing 200 having a shell structure installed outside the vibration generating source 100 .

The vibration generating source 100 may be a part that generates vibration by mechanical operation. For example, the vibration generating source 100 may be a mechanical element that generates reciprocating motion or rotational motion. A compressor is an example of a mechanical element that causes such reciprocating or rotational motion. A specific example of the vibration generating source 100 will be described later.

The vibration generating source 100 and the casing 200 may be connected to each other by the support part 130 . In some cases, the support 130 may include a buffer material such as a spring, and may further include a damper for restraining vibration of the buffer material.

Meanwhile, a reinforcing plate 300 installed in contact with the casing 200 may be provided on at least one surface (for example, the upper surface 201) of the casing 200. Hereinafter, an example in which the reinforcing plate 300 is installed on the upper surface 201 of the casing 200 will be mainly described.

The reinforcing plate 300 has a second curvature (1/R2; see FIG. 2) different from the first curvature (1/R1; see FIG. 2) of one side 201 installed on the casing 200, It may be installed in contact with the upper surface 201 so as to be elastically deformed and have a first curvature (1/R1).

Here, the meaning of being elastically deformed may mean that the reinforcing plate 300 is not plastically deformed and maintains elasticity even if it is deformed to have the first curvature (1/R1). In this state, the reinforcing plate 300 may apply elastic force to the installation surface (upper surface; 201).

At this time, the upper surface 201 may have several different curvatures, and at this time, the first curvature (1/R1) may mean the widest surface among the surfaces having these various curvatures. Hereinafter, the first curvature 1/R1 may be referred to as a primary curvature of the upper surface 201 .

The second radius of curvature R2, which is the radius of curvature of the reinforcing plate 300, may be greater than the first radius of curvature R1. The second radius of curvature R2 may include a plane having a substantially infinite radius of curvature.

As such, the reinforcing plate 300 has a second curvature (1/R2) in a relaxed state before being installed on the casing 200, but has a first curvature (1/R1) when installed in contact with the upper surface 201. can be elastically deformed.

At this time, the reinforcing plate 300 may include a plurality of unit plates 302 that are stacked and provided.

2 and 3 are cross-sectional schematic views showing the coupling structure of the reinforcing plate of the noise reduction device according to the first embodiment of the present invention. Specifically, FIGS. 2 and 3 show a structure in which the reinforcing plate 300 is installed inside the upper surface 201 of the casing 200 .

In FIGS. 2 and 3 , for convenience of description, a portion including the upper surface 201 and the side surface 202 of the casing 200 and the reinforcing plate 300 coupled to the casing 200 are mainly shown.

As shown in FIG. 2 , the reinforcing plate 300 may have a second radius of curvature R2 before being coupled to the casing 200 . Here, the second radius of curvature R2 may mean a substantially flat surface. However, the present invention is not limited thereto, and if the second radius of curvature R2 is greater than the first radius of curvature R1, elastic force can be applied to the upper surface 201 of the casing 200.

The reinforcing plate 300 may be coupled to the inner upper surface 201 of the casing 200 . At this time, as shown in FIG. 3 , the end side of the reinforcing plate 300 may be coupled with the upper surface 201 . Accordingly, the reinforcing plate 300 may include a joint portion 301 at an end side. The reinforcing plate 300 may be pressed against the upper surface 201 by forcible deformation to apply surface pressure.

In this way, in a state where the reinforcing plate 300 is coupled to the inner upper surface 201 of the casing 200, as indicated by an arrow, the elastically coupled reinforcing plate 300 extends to the outer upper surface 201 of the casing 200. will exert an elastic force towards

The elastically coupled reinforcing plate 300 can suppress vibration of the casing 200 by damping the vibration of the casing 200 or reinforcing the rigidity of the casing 200 itself according to the concepts of damping reinforcement and rigidity reinforcement. The design concept and effect of the reinforcing plate 300 will be described later in detail.

The junction part 301 of the reinforcing plate 300 may be fixed to the inner surface of the casing 200 by various coupling means. For example, the junction part 301 of the reinforcing plate 300 may be coupled to the casing 200 by a bonding means such as welding, structural adhesive, rivet, bolt, or epoxy.

4 and 5 are cross-sectional schematic views showing the coupling structure of the reinforcing plate of the noise reduction device according to the second embodiment of the present invention. Specifically, FIGS. 4 and 5 show a structure in which the reinforcing plate 310 is installed outside the upper surface 201 of the casing 200 .

As shown in FIG. 4 , the reinforcing plate 310 may have a third radius of curvature R3 before being coupled to the casing 200 . Here, the third radius of curvature R3 may mean a substantially flat surface.

Meanwhile, the third curvature (1/R3) may be smaller than the first curvature (1/R1) of the upper surface 201 of the casing 200. In this way, the reinforcing plate 310 installed outside the casing 200 applies elastic force to the upper surface 201 when its curvature (1/R3) is smaller than the first curvature (1/R1) of the upper surface 201. can be applied This elastic force may be specifically a tensile force that pulls the upper surface 201 outward.

As shown in FIG. 5 , the end side of the reinforcing plate 310 may be coupled with the upper surface 201 . Accordingly, the reinforcing plate 310 may include a joint portion 311 at an end side.

For parts not described elsewhere, the description of the first embodiment may be applied.

6 and 7 are cross-sectional schematic views showing the coupling structure of the reinforcing plate of the noise reduction device according to the third embodiment of the present invention. Specifically, FIGS. 6 and 7 show a structure in which the reinforcing plate 320 is installed outside the side surface 202 of the casing 200 . However, in some cases, the reinforcing plate 320 can also be coupled to the inside of the side surface 202 of the casing 200, of course.

As shown in FIG. 6 , the reinforcing plate 320 may have a fifth radius of curvature R5 before being coupled to the casing 200 . Here, the fifth radius of curvature R5 may mean a substantially flat surface.

Meanwhile, the fifth curvature (1/R5) may be smaller than the fourth curvature (1/R4), which is the curvature of the side surface 202 of the casing 200. In this way, the reinforcing plate 320 installed outside the casing 200 applies elastic force to the side surface 202 when its curvature (1/R5) is smaller than the fourth curvature (1/R4), which is the curvature of the side surface 202. can be applied This elastic force may be specifically a tensile force that pulls the side surface 202 outward.

As shown in FIG. 7 , the end side of the reinforcing plate 320 may be coupled to the side surface 202 . Accordingly, the reinforcing plate 320 may include a joint portion 321 at an end side.

Meanwhile, although not shown, the reinforcing plate 320 may also be coupled to the inner side surface 202 of the casing 200 .

For parts that are not described elsewhere, at least one of the first and second embodiments may be applied.

8 is a cross-sectional view showing an example of a compressor to which the present invention can be applied.

That is, the noise reduction device of the present invention can be applied to a compressor as shown in FIG. 8 .

For example, the vibration generating source 100 described above may be a compressor. Also, the casing 200 may be a casing of a compressor. Hereinafter, it will be described as an example that the vibration generating source 100 and the casing 200 are each part of the compressor, but the present invention is not limited thereto. However, the effect of the present invention can be further improved when the vibration generating source 100 and the casing 200 correspond to each part of the compressor.

Hereinafter, the vibration generating source 100 and the compressor 100 will be described using the same reference numerals. Also, the casing 200 will be described using the same reference numerals as those of the casing 200 of the compressor 100.

Referring to FIG. 8, the compressor 100 as a vibration generating source includes a mechanical unit 110 that generates vibration by rotational motion, a motor 120 that provides rotational force to the mechanical unit 110, and the mechanical unit 110 and the motor. It includes a support part 130 for supporting at least one of (120). At this time, at least one of the mechanism unit 110 and the motor 120 may be connected to the casing 200 through the support unit 130 .

At this time, the support part 130 may include a buffer material 131 such as a spring, and may further include a damper 132 for restraining vibration of the buffer material 131.

The mechanical unit 110 is connected to a cylinder block 111 including a cylinder 112, a rotating shaft 113 including an eccentric portion 114 that rotates by the rotational force of a motor 120, and a rotating shaft 113, It may be configured to include a piston 116 reciprocating by the eccentric part 114 within 112.

The mechanical unit 110 may be regarded as a part that causes vibration by a rotational motion or an eccentric rotational motion within the compressor 100 .

Here, the piston 116 may be installed to be rotatable with the eccentric part 114 by the piston arm 115 .

Meanwhile, an oil supply unit 140 for supplying oil to the cylinder 112 may be provided below the rotation shaft 113 . As an example of the oil supply unit 140, an oil pump 141 using a gear may be used.

In addition, a pipe 117 connected to the cylinder 112 and discharging the compressed refrigerant may be further provided.

Meanwhile, a suction muffler 118 may be provided in a passage through which the low-pressure refrigerant is sucked into the cylinder 112 and designed in consideration of sound transfer characteristics to reduce noise.

In the structure of the compressor 100, the casing 200 forms an outer structure that seals the inside of the compressor 100 to create a refrigerant atmosphere and prevents contact with external air.

As shown in FIG. 8, the casing 200 of the compressor 100 may be formed by combining an upper shell 210 and a lower shell 220. The upper shell 210 and the lower shell 220 may be tightly coupled to each other.

In this case, the upper shell 210 may include the upper surface 201 described above, and the lower shell 220 may include the lower surface 203 .

Hereinafter, specific examples of the design and shape of the casing 200 connected to the compressor 100 as the vibration generating source 100 and the reinforcing plate 300 installed in the casing 200 will be described.

9 to 11 are diagrams showing analysis results of the main vibration modes of the compressor casing. 9 to 11 show the vibration mode of the casing 200 when the reinforcing plate 300 is not provided.

Specifically, FIG. 9 schematically shows the first vibration mode of the casing 200, FIG. 10 schematically shows the second vibration mode of the casing 200, and FIG. 11 shows the third vibration mode of the casing 200. shown schematically.

The noise generated by the compressor 100 can be regarded as structural noise caused by the vibration mode of the casing 200 generated by the excitation force of the compressor 100 .

When the mode analysis of the casing 200 is performed, noise that may occur in the compressor 100 can be predicted.

As a result of this analysis, it can be seen that there is a high possibility that noise is generated by the main vibration modes shown in FIGS. 9 to 11 .

Basically, the 1st to 3rd vibration modes have a mode that vibrates in the vertical direction (z direction).

At this time, the primary vibration mode shown in FIG. 9 has a mode in which the central portion 204 of the upper surface 201 vibrates vertically. The secondary vibration mode shown in FIG. 10 has a mode in which the upper surface 201 is divided into two regions 205 and 206 in the left and right directions (x direction) and vibrates alternately (in the vertical direction (z direction)). The tertiary vibration mode shown in FIG. 11 has a mode in which the upper surface 201 is divided into two regions 207 and 208 in the longitudinal direction (y direction) and vibrates alternately.

In this way, when the vibration mode analysis of the casing 200 is performed, noise that may occur in the compressor 100 can be predicted.

On the other hand, it is possible to check higher order modes by setting the analysis limit frequency high, but the effect of these higher order modes on actual noise is not large. That is, it can be seen that most of the noise is generated by the first to third vibration modes shown in FIGS. 9 to 11, and the noise caused by the other higher order modes can be relatively small.

In fact, the noise caused by the first vibration mode is the largest, and the noise caused by the second vibration mode and the third vibration mode may be relatively small.

Therefore, by reducing the noise caused by the first to third vibration modes, the noise can be sufficiently reduced, and the other higher order modes may not be considered.

12 is a graph showing noise measurement results of a compressor casing. 13 is an actual spectrum showing noise measurement results of a compressor casing. Similarly, FIGS. 12 and 13 show noise measurement results of the casing 200 when the reinforcing plate 300 is not provided. 12 and 13 show the difference in expression, and in FIG. 12, each data is expressed as a bar added in a corresponding section.

Structural noise caused by the vibration mode of the casing 200 can be confirmed from the result of analyzing the vibration mode of the casing 200 and the noise measurement result as described above.

In the case of noise due to this structure, a base-rising effect is caused in the frequency spectrum, and it can be seen that the base-noise of each mode frequency increases.

That is, the unique vibration mode of the casing 200 itself rises by the vibration of the compressor 100 as a vibration generating source, and is shown as shown in FIGS. 12 and 13 .

As such, the raised base noise appears as three peaks in FIG. 13, where the portion marked A corresponds to the first vibration mode, the portion marked B corresponds to the second vibration mode, and the portion marked C corresponds to the third order vibration mode. It can be seen that it corresponds to the vibration mode.

14 is a diagram showing the maximum vibration position for each main vibration mode of the compressor casing.

Through the vibration mode analysis as described above, it is possible to know the occurrence positions of the first vibration mode, the second vibration mode, and the third vibration mode on the upper surface 201 of the compressor casing 200.

Accordingly, it can be predicted that the noise caused by the vibration of the compressor casing 200 can be effectively reduced if the reinforcing plate 300 is reinforced at the occurrence positions of the first vibration mode, the second vibration mode, and the third vibration mode. there is.

Referring to FIG. 14, the first vibration mode occurs at the center of the upper surface 201, the second vibration mode occurs on both sides in a direction perpendicular to the longitudinal direction of the upper surface 201, and the third vibration mode occurs on the upper surface 201. It can be seen that it occurs on both sides along the longitudinal direction of (201).

However, it can be seen that the generation position of the tertiary vibration mode is biased toward the center on one side, which seems to be due to the shape of the compressor casing 200.

In FIG. 14, it can be seen that if the reinforcing plate 300 having a shape crossing the longitudinal direction of the central side of the casing 200 is provided, it may overlap all of the occurrence positions of the first vibration mode and the second vibration mode. .

The reinforcing plate 300 having this shape may be the simplest and most effective shape capable of damping vibrations caused by the first vibration mode and the second vibration mode or reinforcing the rigidity of the upper surface 201 of the casing 200.

Therefore, the reinforcing plate 300 may have a first structure for reducing the vibration of the first vibration mode and the second vibration mode of the casing 200, and this first structure is the length of the upper surface 201. It may have a shape formed along the upper surface 201 perpendicular to the direction.

In addition, it is also possible to form the reinforcing plate 330 overlapping all occurrence positions of the first vibration mode, the second vibration mode, and the third vibration mode.

The reinforcing plate 330 may have a second structure that reduces vibrations of the first vibration mode, the second vibration mode, and the third vibration mode of the casing 200 . This second structure may include a portion formed along the vertical direction of the longitudinal direction of the upper surface 201 and a portion extending from this portion to one side of the longitudinal direction. That is, this reinforcing plate 330 may have a T-shape.

As described above, the reinforcing plate 300 is an element capable of attenuating vibrations caused by vibration modes of the casing 200 (damping reinforcement) or reinforcing the rigidity of the upper surface 201 of the casing 200 (rigidity reinforcement). can work Hereinafter, the design of such damping reinforcement and rigidity reinforcement will be described.

15 is a schematic graph showing the concept of damping reinforcement of a reinforcing plate.

Damping reinforcement may refer to a principle of reducing noise by increasing energy dissipation capability. That is, when the reinforcing plate 300 is provided, the amplitude of the resonance frequency may decrease in substantially the same frequency band.

16 is a schematic graph showing the concept of rigidity reinforcement of a reinforcing plate.

Rigidity reinforcement may refer to a principle of reducing noise by making the structure of the casing 200 more robust. That is, when the reinforcing plate 300 is provided, the amplitude of the vibration may also decrease while moving in the high-frequency direction.

When the vibration frequency moves in the high-frequency direction, the vibration that can be actually felt can be greatly reduced.

In the case of applying the reinforcing plate according to each embodiment of the present invention, noise due to vibration mode can be reduced by the action of such damping reinforcement and rigidity reinforcement.

17 is a graph showing frequency response characteristics according to the number of stacked reinforcing plates.

As mentioned above, the reinforcing plate 300 may include a plurality of unit plates that are stacked and provided.

In this way, when the reinforcing plate 300 is provided by stacking a plurality of unit plates, it may be advantageous in terms of rigidity reinforcement and damping reinforcement.

In terms of stiffness reinforcement, it can be seen that the natural frequency increases according to the lamination, and in the aspect of damping reinforcement, it can be seen that the damping effect increases according to the lamination.

Referring to the frequency response characteristics of FIG. 17 , graphs are shown when one unit plate is used and when the reinforcing plate 300 is formed by stacking two or three unit plates.

Analyzing the graph of FIG. 17, it can be seen that the damping and reinforcement characteristics increase more when two unit plates are laminated and used than when using one unit plate, and when three plates are laminated and used, the stiffness reinforcement characteristics and damping It can be seen that the reinforcing properties increase together.

18 is a perspective view showing a compressor casing equipped with a reinforcing plate according to the first embodiment of the present invention.

18 is an embodiment in which the casing 200 is provided with a reinforcing plate 300 having a shape 303 according to a first structure for reducing vibration in the first vibration mode and the second vibration mode of the casing 200. represents

That is, the reinforcing plate 300 according to the present embodiment may have a shape 303 formed along the upper surface 201 perpendicular to the longitudinal direction of the upper surface 201 of the casing 200 .

The shape of the first structure is such that the junction part 301 is located at each corner, and the reinforcing plate 300 having the first structure is connected to the casing 200 by a bonding means such as welding, structural adhesive, rivet, bolt, or epoxy. It may be coupled to the top surface 201.

On the other hand, these junctions 301 may be located at the center of the reinforcing plate 300 instead of being located at each corner. In this way, when the bonding portion 301 is located at the center of the reinforcing plate 300, both end portions of the reinforcing plate 300 may apply a pressing force to the casing 200.

The compressor including the casing 200 equipped with the reinforcing plate 300 according to the first embodiment has the simplest shape and can be easily installed in the casing 200 while effectively controlling the first vibration mode and the second vibration mode. Vibration caused by the vibration mode may be damped or the upper surface 201 of the casing 200 may be reinforced. These effects will be described later in detail.

As the thickness of the reinforcing plate 300, a thin plate having a thickness of 0.1 to 0.3T (ie, a thickness of 0.1 to 0.3 mm) may be used. In addition, as described above, in order to maximize rigidity reinforcement and damping reinforcement, a plurality of such thin plates (eg, 2 to 5 sheets) may be overlapped and used.

At this time, it is advantageous to reduce noise when the unit thickness of the reinforcing plate 300 is thinner than the thickness of the casing 200 .

The elasticity of the reinforcing plate 300 may have 50 Gpa to 500 Gpa. In this embodiment, an example in which stainless steel having an elasticity of 200 Gpa is applied is shown. However, it is not limited thereto, and a metal or non-metal material capable of maintaining elasticity even when deformed according to the curvature of the casing 200 may be used.

Other parts not described above may be applied as they are.

19 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a second embodiment of the present invention.

19 is an embodiment in which the casing 200 is provided with a reinforcing plate 330 having a shape according to the second structure to reduce the vibration of the first vibration mode, the second vibration mode, and the third vibration mode of the casing 200. shows an example.

That is, the reinforcing plate 330 according to the present embodiment includes a first portion 332 formed along the vertical direction of the longitudinal direction of the upper surface 201 and a second portion 333 extending from this portion to one side in the longitudinal direction. can include That is, this reinforcing plate 330 may have a T-shape.

The shape of the second structure is such that the junction part 331 is located at each corner, and the reinforcing plate 330 having the second structure is connected to the casing 200 by a bonding means such as welding, structural adhesive, rivet, bolt, or epoxy. It may be coupled to the upper surface 201.

The compressor including the casing 200 equipped with the reinforcing plate 330 according to the second embodiment effectively attenuates vibration caused by the first vibration mode, the second vibration mode, and the third vibration mode, or the casing 200 The upper surface 201 of can be reinforced.

In addition, the items described above may be applied to other parts not described as they are.

20 is a graph showing noise measurement results in a compressor casing equipped with a reinforcing plate according to the first embodiment of the present invention. 21 is an actual spectrum showing noise measurement results in a compressor casing equipped with a reinforcing plate according to the first embodiment of the present invention.

That is, FIGS. 20 and 21 show noise measurement results of the casing 200 in a state in which the reinforcing plate 300 according to the first embodiment described with reference to FIG. 18 is provided. 20 and 21 show the difference in expression, and in FIG. 20, each data is expressed as a bar added in a corresponding section.

Comparing these FIGS. 20 and 21 with FIGS. 12 and 13 described above, the casing ( 200), it can be confirmed that the structural noise caused by the vibration mode is reduced (the graphs of FIGS. 12 and 13 are shown together in FIGS. 20 and 21).

Referring to FIGS. 20 and 21 , it can be seen that the base noise of each mode frequency is greatly reduced.

That is, it can be seen that the base noise, which appears when the vibration mode unique to the casing 200 itself is amplified by the vibration generating source, is substantially reduced.

Referring to FIG. 21, it can be seen that the portion A corresponding to the first vibration mode is reduced to A'. In addition, it can be seen that the B portion corresponding to the secondary vibration mode is reduced to B'. Moreover, it can be seen that the C portion corresponding to the tertiary vibration mode is reduced to C'.

In addition, referring to FIG. 20 , it can be clearly seen that the noise of the casing 200 in the state in which the reinforcing plate 300 according to the first embodiment is provided is substantially greatly reduced. In particular, it can be seen that the 4000 Hz and 5000 Hz bands (D) corresponding to the first to third vibration modes are remarkably reduced.

That is, it can be confirmed that the noise of 7 decibels (dB) is reduced in the 4000 Hz band and the noise is reduced by 4 decibels (dB) in the 5000 Hz band.

22 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a third embodiment of the present invention.

Referring to FIG. 22 , an embodiment in which a reinforcing plate 340 installed outside the upper surface 201 of the casing 200 is applied is illustrated.

That is, the reinforcing plate 340 according to the present embodiment has a shape 342 formed along the upper surface 201 perpendicular to the longitudinal direction of the upper surface 201 outside the upper surface 201 of the casing 200. can have

The shape of this structure is such that the joint 341 is located at each corner, and the reinforcing plate 340 having this structure is welded, structural adhesive, rivet, bolt, epoxy, etc. ) can be bonded to the outer surface of

On the other hand, these junctions 341 may be located at the center of the reinforcing plate 340 instead of being located at each corner. In this way, when the bonding portion 341 is located at the center of the reinforcing plate 340, both end portions of the reinforcing plate 340 may apply a pressing force to the casing 200.

The compressor including the casing 200 equipped with the reinforcing plate 340 according to the third embodiment has the simplest shape and can be easily installed in the casing 200 while effectively controlling the first vibration mode and the second vibration mode. Vibration caused by the vibration mode may be damped or the upper surface 201 of the casing 200 may be reinforced.

As the thickness of the reinforcing plate 340, a thin plate having a thickness of 0.1 to 0.3T (ie, a thickness of 0.1 to 0.3 mm) may be used. In addition, as described above, in order to maximize rigidity reinforcement and damping reinforcement, a plurality of such thin plates (eg, 2 to 5 sheets) may be overlapped and used.

At this time, it is advantageous to reduce noise when the unit thickness of the reinforcing plate 340 is thinner than the thickness of the casing 200 .

The elasticity of the reinforcing plate 340 may have 50 Gpa to 500 Gpa. In this embodiment, an example in which stainless steel having an elasticity of 200 Gpa is applied is shown. However, it is not limited thereto, and a metal or non-metal material capable of maintaining elasticity even when deformed according to the curvature of the casing 200 may be used.

Other parts not described above may be applied as they are.

23 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a fourth embodiment of the present invention.

23 shows the upper surface 201 of the casing 200 of the reinforcing plate 350 having a shape by the second structure for reducing the vibration of the first vibration mode, the second vibration mode, and the third vibration mode of the casing 200. ) shows an embodiment provided on the outer surface of

That is, the reinforcing plate 350 according to the present embodiment includes a first portion 352 formed along the vertical direction of the longitudinal direction of the upper surface 201 and a second portion 353 extending from this portion to one side in the longitudinal direction. can include That is, this reinforcing plate 350 may have a T-shape.

The shape of the second structure is such that the junction part 351 is located at each corner, and the reinforcing plate 350 having the second structure is connected to the casing 200 by a bonding means such as welding, structural adhesive, rivet, bolt, or epoxy. It may be coupled to the outside of the upper surface 201.

The compressor including the casing 200 equipped with the reinforcing plate 350 according to the fourth embodiment effectively attenuates vibration caused by the first vibration mode, the second vibration mode, and the third vibration mode, or the casing 200 The upper surface 201 of can be reinforced.

In addition, the items described above may be applied to other parts not described as they are.

24 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a fifth embodiment of the present invention.

24 shows that the upper surface of the casing 200 ( 201) shows an embodiment provided on the inner surface.

That is, the reinforcing plate 360 according to the present embodiment includes a first portion 362 formed along the vertical direction of the longitudinal direction of the upper surface 201 and a second portion 363 extending from this portion to one side in the longitudinal direction. can include In addition, a third portion 364 may be further provided on the opposite side of the second portion 363 in the longitudinal direction of the upper surface 201 . That is, the reinforcing plate 360 may have a cross (+) shape.

In the shape of this structure, the joint 361 is located at each corner, and the reinforcing plate 360 having the second structure is attached to the upper surface of the casing 200 ( 201) may be coupled to the inside.

The compressor including the casing 200 equipped with the reinforcing plate 360 according to the fifth embodiment effectively attenuates vibration caused by the first vibration mode, the second vibration mode, and the third vibration mode, or the casing 200 The upper surface 201 of can be reinforced.

In addition, the items described above may be applied to other parts not described as they are.

25 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a sixth embodiment of the present invention.

25 shows that the upper surface of the casing 200 ( 201) shows an embodiment provided on the outer surface.

That is, the reinforcing plate 370 according to the present embodiment includes a first portion 372 formed along the vertical direction of the longitudinal direction of the upper surface 201 and a second portion 373 extending from this portion to one side in the longitudinal direction. can include In addition, a third portion 374 may be further provided on the opposite side of the second portion 373 in the longitudinal direction of the upper surface 201 . That is, the reinforcing plate 370 may have a cross (+) shape.

In the shape of this structure, the joint 371 is located at each corner, and the reinforcing plate 370 having the second structure is attached to the upper surface of the casing 200 ( 201) may be coupled to the outside.

The compressor including the casing 200 equipped with the reinforcing plate 370 according to the sixth embodiment effectively attenuates vibration caused by the first vibration mode, the second vibration mode, and the third vibration mode, or the casing 200 The upper surface 201 of can be reinforced.

In addition, the items described above may be applied to other parts not described as they are.

26 is a perspective view showing a compressor casing equipped with a reinforcing plate according to a seventh embodiment of the present invention.

26 shows that the reinforcing plate 380 having a structure capable of reducing not only the first vibration mode, the second vibration mode, and the third vibration mode of the casing 200 but also the vibration of higher order modes than the casing 200 is It shows an embodiment provided on the outer surface of the upper surface 201 of (200).

For ease of coupling, the size of the reinforcing plate 380 may be smaller than the area of the upper surface 201 of the casing 200 .

The shape of this structure is such that the junction part 381 is located along the edge of the reinforcing plate 380, and the inside or side of the upper surface 201 of the casing 200 by means of bonding such as welding, structural adhesives, rivets, bolts, or epoxy. Can be joined on the outside. That is, although this embodiment shows a state in which the reinforcing plate 380 is coupled to the inner surface of the upper surface 201, it can also be coupled to the outer surface of the upper surface 201.

In addition, the items described above may be applied to other parts not described as they are.

As described above, according to the present invention, by analyzing the vibration mode of the casing itself, the vibration by the vibration mode can be controlled to reduce noise.

In addition, noise due to the vibration mode can be reduced by the action of damping reinforcement and rigidity reinforcement according to the analysis of the vibration mode.

On the other hand, the embodiments of the present invention disclosed in this specification and drawings are only presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

100: vibration source (compressor)
110: mechanical part
120: motor
130: support
140: oil supply unit
200: casing
201: upper surface
202: side
203: bottom
300, 310, 320, 330, 340, 350, 360, 370: reinforcement plate

Claims (22)

In the noise reduction device,
vibration source;
a casing connected to the vibration generating source by a support; and
It is configured to include a reinforcing plate installed in contact with at least one surface of the casing,
The reinforcing plate has a second curvature different from the first curvature of the one surface, and is elastically deformed to have the first curvature so as to be installed in contact with the one surface. The noise reduction device according to claim 1, wherein the reinforcing plate comprises a plurality of unit plates that are stacked and provided. The noise reduction device according to claim 1, wherein the one surface is an upper surface of the casing, and the first curvature is a principal curvature of the upper surface. 4. The noise reduction device according to claim 3, wherein the reinforcing plate has a first structure for reducing vibration in the first vibration mode and the second vibration mode of the casing. The noise reduction device according to claim 4, wherein the first structure comprises a shape formed along a vertical direction of the longitudinal direction of the upper surface. The noise reduction device according to claim 5, wherein the reinforcing plate has a second structure for reducing vibration of the first to third vibration modes of the casing. 7. The method of claim 6, wherein the second structure comprises a first portion formed along a vertical direction of the longitudinal direction of the upper surface and a second portion extending from the first portion to one side of the longitudinal direction. noise reduction device. 8. The noise reduction device according to claim 7, wherein the second structure includes a third portion extending from the first portion in a direction opposite to the second portion. The noise reduction device according to claim 3, wherein the reinforcing plate is installed on at least one of an inner surface and an outer surface of the upper surface. The noise reduction device according to claim 1, wherein the reinforcing plate is installed on a side surface or a lower surface of the casing. The noise reduction device according to claim 1, wherein the second curvature is smaller than the first curvature. The noise reduction device according to claim 1, wherein the vibration generating source comprises a compressor. The method of claim 12, wherein the compressor,
Mechanical parts that generate vibration by rotational motion;
a motor providing rotational force to the mechanism; and
A noise reduction device comprising a support portion supporting at least one of the mechanical portion and the motor and connected to the casing. The method of claim 13, wherein the mechanism unit,
a cylinder block containing cylinders;
a rotational shaft including an eccentric that rotates by the rotational force of the motor; and
A noise reduction device comprising a piston connected to the rotating shaft and reciprocating in the cylinder by the eccentric part. In the compressor,
outer casing;
a mechanical unit installed in the outer casing to generate vibration by rotational motion;
a motor providing rotational force to the mechanism;
a support portion supporting at least one of the mechanical portion and the motor and connected to the casing; and
Compressor comprising a reinforcing plate installed in contact with at least one surface of the outer casing, having a second curvature different from the first curvature of the one surface, and elastically deformed to have the first curvature . The method of claim 15, wherein the mechanism unit,
a cylinder block containing cylinders;
a rotational shaft including an eccentric that rotates by the rotational force of the motor; and
Compressor comprising a piston connected to the rotating shaft and reciprocating in the cylinder by the eccentric part. 16. The compressor according to claim 15, wherein the reinforcing plate includes a plurality of unit plates that are stacked. 16. The compressor according to claim 15, wherein the reinforcing plate has a first structure for reducing vibration of the first vibration mode and the second vibration mode of the outer casing. 19. The compressor according to claim 18, wherein the first structure includes a shape transverse to the longitudinal direction of the one surface. 16. The compressor according to claim 15, wherein the reinforcing plate has a second structure for reducing vibration of the first to third vibration modes of the outer casing. 21. The compressor according to claim 20, wherein the second structure includes a first portion crossing the longitudinal direction of the one surface and a second portion extending vertically from the first portion. 22. The compressor of claim 21, wherein the second structure includes a third portion extending from the first portion in a direction opposite to the second portion.

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