JPH0712069A - Soundproof structure of package type screw compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] A soundproof structure for a packaged screw compressor that can reduce the noise generated from the open part and the solid-borne sound to improve the soundproof performance and facilitate the workability of the maintenance of internal equipment. I will provide a. [Structure] The base 2 is fixed on the pedestal 1, and the base 2
The corner frames 3 are fixed to the upper four corners, the central frame 4 is fixed to the middle portion of the side surface, and the ceiling panels 8 and 9, the door panels 5 and 6, and the panel 7 are fixed to each frame. A vibration-proof material was attached to the overlapping surface between these panels and frames. Further, the surface area of the panel or the panel-like structure is set to 80% or more of the surface area of the entire package. Furthermore, in the exhaust passage of the main motor, the shortest distance in the surface direction between the exhaust opening 13 and the exhaust port 17 is 1/2 of the distance in the direction perpendicular to the both surfaces.
And

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a compressor body, an electric motor,
The present invention relates to a soundproof structure of a package type screw compressor in which equipment such as auxiliary equipment is housed in a box.

[0002]

2. Description of the Related Art A conventional soundproof structure of a package type screw compressor is a package in which a base, a frame and a panel are formed in a box shape and a compressor body, an electric motor, an auxiliary machine and the like are covered. The airborne sound generated inside is prevented from being transmitted to the outside of the package or being diffused from the opening. Further, a sound absorbing material is attached to the inner surface of the panel to reduce the reverberant sound inside the package. As such a conventional technique, for example, there is a soundproof structure of a compressor described in Japanese Utility Model Publication No. 62-14180. However, in the conventional soundproof structure, no consideration has been given to the reduction of solid-borne sound in which vibration of the internal equipment from the compressor body or the like propagates to each part on the outer surface of the package.

[0003]

Generally, since a screw compressor compresses air by meshing a female and a male screw rotor, the discharge air pulsates at a frequency of (rotor speed of rotor) × (number of teeth of rotor). Most of the sound generated from the screw compressor is caused by the pulsation of air. The conventional soundproof cover absorbs the air-borne sound inside the package generated by the pulsation of the air with the sound absorbing material attached to the inner surface of the panel, and also the sound is shielded by the members such as the panel and the frame and transmitted to the outside of the package. The structure was to reduce the radiated noise. For this reason,
In order to improve the noise reduction effect, the method of increasing the thickness of members such as the panel, the frame and the base to improve the sound insulation performance has been taken, but the improvement of the noise reduction effect is limited.

Further, in order to improve the sound insulation performance, the weight of the panel, the frame and the like is increased and it is necessary to provide a frame having a large plate thickness in the panel combination portion.
Therefore, when performing maintenance on the internal equipment, almost all of the frame, panel, and the like are removed in order to secure a space required for the work, and there is a problem that disassembling the soundproof cover takes time.

Further, the soundproof cover is provided with an opening for discharging the cooling air of the main motor to the outside of the package,
A duct with a sound absorbing material attached to the inner surface is provided in the blowout section,
It adopted a structure that reduces the sound emitted by absorbing sound.
Since no consideration has been given to the positional relationship between the air outlet of the motor and the opening of the duct, there is a problem that high-frequency sound is likely to be emitted from the opening.

Further, there is a problem that vibration of internal equipment from the compressor body or the like propagates in the order of internal equipment->frame->base->frame-> panel, so-called solid propagation sound.
Further, there is a problem that a frame, which is more likely to generate solid-borne sound than the panel, occupies a large proportion of the surface area of the entire soundproof structure.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to reduce the sound generated from the open portion and the solid propagating sound to improve the soundproof performance. The purpose of the present invention is to provide a soundproof structure for a package type screw compressor that can facilitate maintenance work of internal equipment.

[0008]

In order to achieve the above object, the structure of the first invention relating to the soundproof structure of the package type screw compressor of the present invention is such that a device such as a compressor main body, an electric motor, an auxiliary machine is provided. A package type compressor, which is disposed on the same frame and housed in a box body, the box body comprising a base, a frame, and a panel, the four corners on the base of the box body, and the box body. A vertical frame is provided on each of the middle parts of the two large side surfaces of the four side surfaces,
Through these vertical frames, at least three panels on the ceiling and six panels on the side, which can be fixed or opened and closed,
Or, attach any of the panel-like structures, and attach a vibration-proof material to each of the overlapping surfaces between the panel and the frame, between the panels, between the panel and the base, and between the base and the pedestal. Is attached.

More specifically, the panel of the ceiling portion is guided to the upper end surface of the vertical frame provided at the four corners of the box body and the middle portion thereof, and to the upper edge of the panel of the side surface portion of the box body or the panel-like structure. It was placed like this. In other words, by reducing the number of frames and removing only the panel,
The structure allows easy maintenance of internal equipment.

In order to achieve the above object, the second invention relating to the soundproof structure of the package type screw compressor according to the present invention is such that at least one of the two panels having a large area has a frame that can be opened and closed. Attached to, and
As a double-opening structure, the gap between both panels is set to be equal to or less than the thickness of the panel, the exposed area of the frame is reduced, and the area where solid-borne sound is generated is reduced.

Further, according to a third aspect of the soundproof structure of the package type screw compressor of the present invention, the surface area of the panel or the panel-like structure is equal to the surface area of the entire package.
It is set to 0% or more, which reduces the frame surface area where solid-borne sound is easily generated.

Further, a fourth invention relating to the soundproof structure of the package type screw compressor of the present invention is such that an intake port and an exhaust port for air for cooling the electric motor are opened in a panel or a panel-like structure, and the intake port is provided. And the cooling air passage in the electric motor, and between the cooling air passage in the electric motor and the discharge port are connected by a duct having a sound absorbing material attached to a part of the inner surface, and further connected to the exhaust chamber of the exhaust duct. The opening is provided substantially parallel to the outlet, and the shortest distance in the surface direction between the edge of the duct opening and the edge of the outlet is 1 / of the distance perpendicular to both surfaces.
By setting it to 2 or more, the level of sound leaking from the discharge part is reduced.

Furthermore, a fifth aspect of the soundproof structure of the package type screw compressor of the present invention is that the frame of the box, the base, the frame, the panel or the panel-like structure is a damping steel plate or a sound source. It is composed of a plate material coated with vibration damping paint on the side to reduce the generation of solid propagating sound.

Furthermore, a sixth invention relating to the soundproof structure of the package type screw compressor of the present invention covers the outer surface portion of the base or frame of the box body with a sound insulating material, and the base or frame and the sound insulating material are By providing an air layer between and by providing a sound absorbing material between the sound insulating material and the base or frame,
It reduces the transmitted sound from the pedestal and base and the solid-borne sound.

[0015]

The concept of developing the present invention and the functions of the above technical means are as follows. In general, for example, noise in a screw compressor is not only noise that is directly transmitted to the outside by the pulsation of air in the internal equipment (airborne sound), but also vibration of the internal equipment that is generated by the pulsation of air propagates to the soundproof cover. Then, there is noise (solid-borne sound) generated by the vibration of the soundproof cover.

The pulsation frequency of air is several hundreds to several hundreds.
Since it is 0 Hz, the former is a relatively thin frame,
It is greatly reduced by covering with a panel. On the other hand, in the latter, by installing the internal equipment on the mount via a vibration-proof material,
Although it can be reduced to some extent, vibrations in the low frequency range propagate to the soundproof cover and generate noise. Vibration propagates in the order of internal equipment → frame → base → frame → panel. Therefore, by providing a vibration damping material at each connection portion, the propagation of vibrations is suppressed, and the panel becomes the portion that is least affected by the vibrations.

According to the first aspect of the present invention, the frame is fixed to each of the four corners on the base and fixed to two in the middle in the vertical direction. Therefore, when maintenance is performed, the soundproof panel is removed. By doing so, the internal equipment can be easily removed and installed, and the work can be performed easily. Further, by eliminating the horizontal frame that connects the vertical frame at the top, the internal equipment can be easily lifted and moved.

In the package type screw compressor, equipment such as a compressor body, an electric motor, and an auxiliary machine are installed on the same stand, and a soundproof structure is attached to the stand. Therefore, the vibration of the internal equipment propagates and the stand, Fixed propagating sound is generated from the base, frame, and panel due to vibration. From this, it is possible to suppress the propagation of vibrations by attaching vibration damping materials to the overlapping surfaces between each panel and the frame, between the panels, or between the panel and the base, and between the base and the base. The soundproofing performance is improved by suppressing the generation of fixed propagating sound.

According to the second aspect of the invention, since the panel is fixed to the frame via the vibration-proof material, the noise generated by the vibration is small. From this, the front panel is composed of two door panels, and by opening both doors, the distance between the door panels is
The exposed area of the frame, which is less than the thickness of the door panel and is easily affected by vibration, can be minimized, and sound insulation performance is improved by reducing the area where solid-borne sound is generated.

According to the third aspect of the invention, the surface area of the panel which is not easily affected by vibration is set to 80% or more of the total surface area, so that the surface area of the frame where solid-borne sound is generated is reduced. , The soundproofing performance is improved.

According to the fourth aspect of the invention, the frequency component of the sound leaked from the outlet provided in the ceiling panel is about 1000 Hz.
Since the above components are dominant, by setting the shortest distance in the surface direction between the duct opening edge and the discharge port edge to be 1/2 or more of the distance in the direction perpendicular to the two sides, the amount generated from the duct opening edge can be reduced. Diffraction phenomenon is less likely to occur in the component having a short wavelength of 1000 Hz or more, so that the component of about 1000 Hz or more leaked from the discharge port can be reduced, and the soundproof performance is improved.

According to the fifth invention, the base, the frame,
By using a vibration damping material or a vibration damping paint for the panel, it is possible to suppress vibration and reduce the generation of solid propagating sound, thus improving the soundproofing performance.

According to the sixth aspect of the present invention, the outer surface of the base or frame of the box is covered with a sound insulating material, and an air layer is provided between the base or frame and the sound insulating material. By installing a sound absorbing material between the sound insulation material and the sound insulation material,
The sound transmitted from the base and the sound transmitted from the solid can be reduced, and the soundproofing performance is improved.

[0024]

Embodiments of the present invention will be described below with reference to FIGS. [Embodiment 1] First, embodiments of the above-mentioned first to third and fifth inventions will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the external appearance of a soundproof structure of a package type screw compressor according to an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view of the soundproof structure in a state where maintenance is performed.
[FIG. 3] is an enlarged cross-sectional view of a gantry.

In FIG. 1, 1 is a pedestal, 2 is a box base on the pedestal 1, 3 is corner frames provided at four corners of the box base 2, and 4 are four side surfaces of the box. The corner frames 3 and the central frame 4 are central frames provided in an intermediate portion of two surfaces having a large area, and each of the corner frames 3 and the central frame 4 constitutes a vertical frame that stands upright in the vertical direction. Reference numeral 5 denotes a small door panel attached to one of the two sides of the box body having a small area, that is, one side not having the central frame, and 7 denotes a panel attached to the other side not having the central frame.

Reference numeral 6 denotes a large door panel attached to two of the four side surfaces of the box body having a large area, that is, the side where the central frame 4 is present. The large door panel 6 has a double-opening structure as will be described later. Is. In addition, 8 is a large ceiling panel, 9 is a small ceiling panel, these ceiling panels,
On the upper end surface of the corner frame 3 and the central frame 4, the small door panel 5, the large door panel 6, on the side surface of the box body 6,
It is mounted and attached so as to be guided to the upper edge of the panel 7 or the like.

More specifically, the box constituting the soundproof structure of the package type screw compressor includes a frame 1, a base 2, a corner frame 3, a central frame 4, a large door panel 6 and a small door panel 5. , Panel 7, large ceiling panel 8 and small ceiling panel 9, and a sound absorbing material is attached to the inner wall of the box. Although not shown, devices such as a compressor body, an electric motor, and an auxiliary machine are arranged on the gantry 1 inside the box body via a vibration isolator. Further, on the outer surface of the box body, operating equipment and measuring equipment necessary for the operation of the compressor, a microcomputer board, etc. (not shown) are arranged, or the measuring equipment inside the box body is transparent. Windows are provided.

In such a box, the base 2 is fixed by a clamp having a vibration-proof material on its contact surface via a vibration-proof material on the pedestal 1 in order to prevent vibration propagation. Further, the corner frame 3 and the central frame 4 are fixed to the base 2. Further, the small door panel 5 is mounted between the corner frames 3 and is configured to be openable and closable. Further, a panel 7 provided with an electric motor cooling air suction opening (not shown) is attached to the side surface facing the small door panel 5.

The large door panel 6 has a hinge 11 on the corner frame 3 side and a lockable knob 1 on the central frame 4 side.
By providing a door panel that can be opened and closed with 0, and has a double-opening structure, the distance between the two large door panels 6 can be minimized, and the exposed area of the central frame 4 where solid-borne sound is likely to occur is minimized. I keep it to the limit. Further, the side surface facing the large-sized door panel 6 also has the same structure by using two large-sized door panels 6 in the same manner. Further, on the surfaces of the small-sized door panel 5, the large-sized door panel 6, and the panel 7 that come into contact with other parts, a vibration-proof material that also serves as packing for preventing sound leakage is attached.

The large-sized ceiling panel 8 and the small-sized ceiling panel 9 are fixed to the corner frame 3 and the central frame 4 via a vibration-proof material. The large ceiling panel 8 is provided with a compressed air intake opening 12 and a motor cooling exhaust opening 13. Therefore, the panel or panel-like structure such as the large door panel 6, the small door panel 5, the panel 7, the large ceiling panel 8 and the small ceiling panel 9 has a structure in which the propagation of vibrations from other parts is prevented. In addition, the surface area of the panel or the panel-like structure occupies 80% of the outer surface area of the box body of the entire package, so that a box body with less fixed propagation sound is generated.

FIG. 2 is a perspective view showing a state in which maintenance is performed. The box frame structure of this embodiment has a lateral direction in which the corner frame 3 and the central frame 4 are connected at an upper portion, as compared with the conventional case. Since there is no frame of the large door panel 6, small door panel 5, panel 7,
By simply removing the panels such as the large-sized ceiling panel 8 and the small-sized ceiling panel 9 or the panel-like structure, the space required for maintenance of the internal equipment can be secured.
Therefore, the internal equipment can be easily lifted, moved, removed, and attached.

According to the first to third embodiments of the invention shown in FIGS. 1 and 2, by removing the panel or the panel-like structure, a maintenance space for the internal equipment can be easily obtained and the internal equipment can be lifted. , Removal and installation work can be easily performed. In addition, vibration is less likely to be transmitted between the parts, solid-borne sound can be reduced, and soundproof performance is improved. Further, the exposed area of the central frame can be minimized, the influence of solid-borne sound can be prevented, and the soundproof performance is improved. Furthermore, the surface area occupied by the panel increases,
Generation of solid propagating sound can be reduced and soundproofing performance is improved.

FIG. 3 is a cross-sectional view of the gantry 1. In order to prevent the vibration propagating from the internal equipment from propagating to other parts, the damping material 14 is applied between the sound absorbing material 15 and the gantry 1. The vibration is damped by the gantry 1 by attaching a vibration damping material. According to the embodiment of the fifth aspect of the invention shown in FIG. 3, by applying the damping paint, the generation of solid propagating sound can be reduced and the soundproof performance is improved. That is, the portion of the box forming the package is less vibrated and the solid-borne sound is less generated than in the conventional case.

[Embodiment 2] Next, a soundproof structure according to an embodiment of the fourth aspect of the invention, which suppresses noise propagation from the opening, will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a cooling exhaust passage of the main electric motor in the box body of FIG. Exhaust gas of the main motor M shown by a chain double-dashed line in FIG. 4 passes through an exhaust duct 19 having a sound absorbing material 16 attached inside and is released from an opening 13 provided in the large ceiling panel 8. Here, the exhaust port 17 of the main electric motor M related to the duct opening of the exhaust duct 19
Is provided substantially parallel to the outlet 13, and the shortest distance in the surface direction between the edge of the duct opening and the edge of the outlet is 1/2 or more of the distance in the direction perpendicular to the two surfaces. That is, when the distance between the exhaust port 17 of the main motor M and the opening 13 is L and the surface distance between the exhaust port 17 and the opening 13 is H, L / H
The opening 13 is provided at a position that is 1/2.

Therefore, the high frequency electromagnetic noise of the main motor M,
That is, since the frequency components of about 1000 Hz to several thousands Hz have strong directivity and hardly cause diffraction, they are absorbed by the sound absorbing material 16 inside the exhaust duct 19 and converted into heat energy. Therefore, the sound leaking from the opening 13 to the outside is reduced in the high frequency electromagnetic sound having the frequency component of about 1000 Hz to several thousands Hz, and the soundproof performance is improved. Further, at this time, the high-frequency electromagnetic noise of the main motor M having strong directivity is
Although passing through the exhaust duct 19, the sound is absorbed by the sound absorbing material 16 of the large-sized ceiling panel 8 and is further insulated by the sound insulating material 18 mounted in the sound absorbing material 16.

According to the embodiment of the fourth invention shown in FIG. 4,
By setting the opening position of the discharge port of the ceiling panel to a predetermined position, the sound generated from the discharge port (opening 13) can be reduced and the soundproof performance is improved.

[Embodiment 3] Next, a double sound insulation structure according to an embodiment of the sixth invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the double mount in the box body of FIG. The double sound-insulating structure covers the outer surface of the base of the box or the pedestal with a sound-insulating material, and provides an air layer between the base or the pedestal and the sound-insulating material. A sound absorbing material is put between them.

As shown in FIG. 5, since the gantry 1 has a large level of sound generated on the outer surface of the box body, the iron plate 21 is fixed to the outer surface of the gantry 1 via the damping material 20. Therefore, the transmitted sound and solid propagating sound generated from the gantry 1 pass through the air layer 22 and are shielded by the iron plate 21, so that the soundproof performance is improved. Further, when fixing the vibration from the gantry 1 to the iron plate 21 so as not to propagate, the damping material 20 is attached so that the gantry 1 and the bolts 23 do not come into direct contact with each other.

According to the sixth embodiment of the invention shown in FIG. 5,
Cover the outer surface of the box base or frame with a sound insulation material,
By providing the air layer between the base or the pedestal and the sound insulating material, the generated sound can be reduced and the soundproof performance is improved. Further, by inserting a sound absorbing material between the base or the mount and the sound insulating material, the generated sound can be reduced and the soundproof performance is improved.

[0040]

As described in detail above, according to the present invention, the sound generated from the open portion and the solid propagating sound are reduced to improve the soundproof performance, and the workability of the maintenance of the internal equipment is facilitated. It is possible to provide a soundproof structure of a package type screw compressor that can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a soundproof structure of a package type screw compressor according to an embodiment of the present invention.

FIG. 2 is a perspective view of the soundproof structure in a maintenance state.

FIG. 3 is an enlarged cross-sectional view of a gantry.

FIG. 4 is a cross-sectional view showing a cooling exhaust passage of a main motor in the box body of FIG.

5 is a cross-sectional view of the double mount in the box body of FIG.

[Explanation of symbols]

 1 Stand 2 Base 3 Corner Frame 4 Center Frame 5 Small Door Panel 6 Large Door Panel 7 Panel 8 Large Ceiling Panel 9 Small Ceiling Panel 11 Hinge 13 Exhaust Aperture 14,20 Damping Material 15,16 Sound Absorbing Material 17 Exhaust Port 19 Exhaust Duct 21 Iron Plate 22 Air Layer

Claims (8)

[Claims] 1. A package type in which devices such as a compressor body, an electric motor, and an auxiliary machine are arranged on the same frame and housed in a box body, and the box body is composed of a base, a frame and a panel. In the screw compressor, vertical frames are provided at the four corners on the base of the box body and the respective intermediate portions of the two large surface areas of the four side surfaces of the box body. , At least 3 panels on the ceiling and 6 panels on the side that can be fixed or opened and closed,
Or, attach any of the panel-like structures, and attach the vibration-proof material to each of the overlapping surfaces between the panel and the frame, between the panels, between the panel and the base, and between the base and the mount. The soundproof structure of the package type screw compressor, which is equipped with. 2. The panel of the ceiling part is guided to the upper end surface of the vertical frame provided at the four corners of the box body and the middle part thereof, and to the upper edge of the panel of the box side surface part or the panel-like structure. The soundproof structure of the package type screw compressor according to claim 1, wherein the soundproof structure is mounted on the package. 3. At least one of the large-area side faces 2
The soundproof structure for a package type screw compressor according to claim 1, wherein the plurality of panels are attached to the frame so as to be openable and closable, and the gap between the panels is equal to or less than the thickness of the panels as a double-opening structure. 4. The soundproof structure for a package type screw compressor according to claim 1, wherein the surface area of the panel or the panel-like structure is 80% or more of the surface area of the entire package. 5. An inlet and an outlet of air for cooling the electric motor are opened in a panel or a panel-like structure, and between the inlet and the cooling air passage in the electric motor and between the cooling air passage in the electric motor and the cooling air passage. A duct with a sound absorbing material attached to a part of the inner surface is connected to the exhaust port, and the opening of the exhaust duct to the exhaust chamber is provided almost parallel to the exhaust port so that the duct opening edge and exhaust 2. The soundproof structure for a package screw compressor according to claim 1, wherein the shortest distance in the surface direction from the edge of the outlet is at least ½ of the distance in the direction perpendicular to the both surfaces. 6. The box frame, the base, the frame, the panel, or the panel-like structure is formed of a damping steel plate or a plate material having a sound source side coated with a damping paint. Item 1. A soundproof structure for a package type screw compressor according to Item 1. 7. The outer surface portion of the base of the box or the gantry,
The soundproof structure for a package type screw compressor according to claim 1, wherein the soundproof structure is covered with a sound insulating material, and an air layer is provided between the sound insulating material and the base or pedestal. 8. The soundproof structure for a packaged screw compressor according to claim 7, wherein a sound absorbing material is inserted between the base or the mount and the sound insulating material.