JP2003343495A - Noise reduction device for compressor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise reduction device for a compressor unit capable of required reduction of noise even without enclosure with a noise reduction means for the compressor unit by the fan cover having the function which suppresses the noise generated at the outer fan portion of a motor for driving the compressor forming the source of noise of the compressor unit, and damps the vibration by absorbing, and an additional noise reduction means with the interposition of a damping material to the mounting surface and sticking a damping member to the vibrating member. <P>SOLUTION: The noise reduction means for a non-explosion-proof type motor of the compressor unit consists of the fan cover 10a. The fan cover 10a is constituted by an opening cover 11, a sound absorbing material 12 which is lined through the soft rubber 13 provided on an inside vibrating portion, a woven metal wire structure member 17 covering the front of the opening, and the damping material 20a. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor unit such as a refrigerating machine, and more particularly to a compressor unit having a noise reduction means of a drive motor forming a noise source and an additional noise reduction means for a related device. Noise reduction device.

[0002]

2. Description of the Related Art As a compressor unit used in a refrigerator or an air conditioner, an enclosure type compressor unit in which the compressor unit is covered with an enclosure is used in order to reduce noise of the unit.

The main noise generation point of the compressor unit is a rubbing sound of a motor, which is a rotating machine. The rubbing sound is, for example, in the case of a fully-closed external fan type, a rotation of the non-explosion-proof motor 50 shown in FIG. The main cause of motor noise is due to the friction between the suction rotary blade 51 attached to the child and the inflow air 52 shown by the dotted line. That is, the rotating blades 51 forming an obstacle in the middle of the flow of the outside air from the outside air inlet change the direction of the flow by the sound of the air flow due to the discontinuous flow, and the vortex generated behind the obstacle against the flow. Sound causes frictional noise and vibration between the fluid and the rotary vanes.

This vibration is transmitted to the rotary shaft 53 and the bearing 53a for bearings, and is further transmitted to the bracket 54 and the fan cover 55, and the fan cover 55 forms a new noise source.

Further, an enclosure type compressor unit is used to establish a section between the section covering the entire area of the compressor unit and another section and to prevent noise. As shown in FIG. 7, the enclosure-type compressor unit has a non-explosion-proof motor 50 / explosion-proof motor 60, a compressor 62 directly connected to the motor, and related equipment built in the enclosure 58, and the enclosure 58 has an upper portion. Through the exhaust fan 59 and the exhaust duct 63 provided in the upper intake hole 5
The outside air is sucked in through the 8b and the exhaust hole 58a to ventilate the inside of the enclosure 58. In the case of using the above enclosure, the noise generated in the compressor unit propagates through the air to vibrate the outer wall of the enclosure, which causes a new noise source to the outside.

[0006] Further, there have been conventionally proposed noise reduction related to the above-mentioned air conditioner-related devices, and those proposals are disclosed in Japanese Patent Application Laid-Open No. 6-81790 (hermetic type electric compressor) and Japanese Patent Application Laid-Open No. HEI-1.
No. 1-23088 (absorption heat pump air conditioner) and JP-A No. 11-281098 (noise reduction device for air conditioner outdoor unit).

The proposal disclosed in the above-mentioned JP-A-6-81790 relates to the prevention of noise generated by vibration of the accumulator and hermetic container of a hermetic compressor, and the surface of the vibrating compressor and hermetic container. The butyl rubber adhesive layer is formed on and the aluminum layer is formed on the butyl rubber adhesive layer, and the former causes elastic deformation, thickness deformation, and shear deformation to absorb vibration energy, and the vibration is suppressed by the latter aluminum layer. It is designed to promote the absorption of. The above-mentioned proposal describes means for suppressing the propagation of the vibration generated from the vibrating body to the outside, and does not describe the vibration reducing means in the vibration source.

The proposal disclosed in Japanese Patent Laid-Open No. 11-23088 relates to reduction of operating noise of a refrigerant circuit and a blower circuit in an outdoor unit of an absorption heat pump air conditioner. The bottom of the solution pump, which is the source of vibration, the connection between the regenerator and the refrigerant case, the connection between the rectifier and the refrigerant case, and the connection between the heat exchanger and the refrigerant case are provided with vibration suppressors, respectively. A vibration absorber that absorbs the vibration coming from the pump through the pipe is provided, and the vibration noise generated in the refrigerant circuit is confined in the refrigerant case to reduce the noise in the refrigerant circuit. As the above-mentioned vibration preventive body, a resilient vibration-proof rubber, vibration-proof resin, or coil spring is cited for the purpose of suppressing or relaxing the vibration. Further, in order to absorb the vibration, a coating that absorbs the vibration or a damping material is applied. Also, the use of damping steel plates is mentioned. The above proposal confines the vibration of the solution pump in the refrigerant circuit as the vibration source to the refrigerant case and provides a vibration preventive body and a vibration absorber to prevent the vibration from propagating from the case. No control measures for sources are mentioned.

Further, the proposal disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-281098 relates to a noise reduction device for an outdoor unit of an air conditioner, and more specifically, it cuts off noise propagating from a compressor to reduce noise during operation of the air conditioner. It is configured to have a lower sheet disposed in the lower portion of the compressor and a dome-shaped upper sheet that wraps the side and upper portions of the compressor. It is composed of a sound insulating material to be reflected and a sound absorbing material attached to its inner surface. Also in this case, the means for confining the noise in the predetermined space by the sound insulating material and the sound absorbing material is described, and the specific reducing means for the noise generating source is not mentioned.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and suppresses noise generated in an outer fan portion of a compressor driving motor forming a noise source of a compressor unit and suppresses the vibration. Noise reduction by a fan cover with a function of absorbing and damping, noise reduction means by interposing the damping material on the mounting surface and adhering the damping member to the vibrating member, and related equipment of the compressor unit. It is an object of the present invention to provide a noise reduction device for a compressor unit, which enables required noise reduction without an enclosure by the additional noise reduction means that has been performed.

[0011]

Therefore, a noise reduction device for a compressor unit, which constitutes the first aspect of the present invention, includes a compressor unit which is formed by connecting a compressor body to a non-explosion-proof motor. Installed on the base without being covered with a sound box), and at the outside air intake side for the external fan of the non-explosion-proof motor, an intake opening larger than the fan outer circumference of the fan cover is formed to enlarge it. In addition, a sound absorbing material is attached to the intake opening, and a fan cover configured to interpose a vibration damping material made of soft rubber (for example, butyl rubber) in a portion where vibration is generated is provided. .

The noise reduction device of the present invention first confirms the type of vibration that is the noise source, performs the best vibration suppression for that, then suppresses the propagation of the suppressed vibration, and then the second vibration source. The formation is suppressed. Therefore, aiming at noise reduction of the drive motor of the compressor, which is the noise generation source of the compressor unit, the drive motor is divided into a non-explosion-proof motor and an explosion-proof motor, and the above invention is configured for the non-explosion-proof motor. It was done. That is, in the above invention, when the compressor unit using the non-explosion proof motor is provided on the exposed base without using the enclosure, the noise reducing means of the non-explosion proof motor, which is a noise generation source, is provided. The noise generation of the non-explosion-proof motor in this case is caused by the friction between the intake rotary blades and the inflowing air. Therefore, in order to reduce the velocity of the inflowing air that causes the friction, The opening area of the intake opening of the fan cover is enlarged to form an opening surface larger than the outer circumference of the fan to reduce the inflow velocity of the outside air, and at the same time, the vibration due to the air friction of the rotary blades propagates in the air and It reaches the enlarged intake opening and causes new vibration.However, since the air vibration propagating in the air is absorbed before it reaches the fan cover, the sound absorbing material is absorbed by the fan cover. Is mounted inside the over, in which thereby reducing the noise generated by the fan cover which is newly formed.

A second aspect of the present invention relates to a noise reduction device for a compressor unit using an explosion-proof motor, wherein the explosion-proof motor that is the noise source of the compressor unit is compressed to the explosion-proof motor. The compressor unit formed by connecting the machine main bodies is exposed and installed on the base without being covered with an enclosure (soundproof box), and is provided outside the first fan cover to which the explosion-proof motor is attached. An intake opening larger than the outer circumference of the fan of the first fan cover is formed, a sound absorbing material is attached to the intake opening, and a damping material made of soft rubber (for example, butyl rubber) is interposed at a portion where vibration is generated. It is characterized in that a second fan cover having the above-mentioned configuration is provided.

In the above invention, the noise of the explosion-proof motor, which is a noise source, is provided when the compressor unit, which is formed by connecting the explosion-proof motor to the compressor body, is provided on the exposed base without using the enclosure. Regarding the reducing means, a porous sound absorbing material is provided at a distance from the entire outer peripheral surface of the explosion-proof fan cover forming the noise source of the explosion-proof motor.
Second cover provided on the explosion-proof fan cover, which is a cover of the fan, and contacts the sound-absorbing material to form an intake opening larger than the outer circumference of the fan
The fan cover is attached, and a vibration damping material made of soft rubber (for example, butyl rubber) is interposed in the explosion-proof cover forming the vibration source.

Further, in the first and second inventions,
A sound absorbing material is lined in the air intake opening, and a vibration damping material made of soft rubber (for example, butyl rubber) is interposed at a portion where vibration is generated.

The invention specifies a preferable configuration for the fan cover provided on the non-explosion-proof motor and the second fan cover provided outside the explosion-proof fan cover provided on the explosion-proof motor. The fan cover and the second
An opening surface larger than the outer diameter of the fan is provided in the intake opening of the fan cover, a woven wire mesh structure with low ventilation resistance is provided on the intake surface that is in contact with the outside air, and a porous sound-absorbing material is provided inside the In the case of non-explosion proof type, it is provided in front of the external fan part, and in the case of explosion proof type, it is installed close to the explosion proof fan cover which is the first fan cover. Intervening. In the case of the explosion-proof type, since the explosion-proof fan cover, which is the first fan cover, is a vibration generator, a soft rubber (for example, butyl rubber) for soundproofing is provided on the outer surface side of the cover excluding the vent holes of the cover. A vibrating material is attached to suppress the occurrence of vibration.

Further, in a compressor unit using a non-explosion proof motor having the noise reduction means, a container such as an oil separator constituting the compressor unit is directly or on the unit base via a damping material. It is preferable that the table is supported by a gantry provided on the table, and a damping material made of soft rubber is attached to the surfaces of the gantry, the container, the pipe, and the support, which are vibration parts.

The above invention describes additional noise reducing means for a compressor unit using a non-explosion proof motor provided with the noise reducing means of the present invention, and is a device related to the compressor unit. Containers such as liquid containers and oil separators, pipes, etc. are provided directly on the exposed unit base or on a mount provided on the base via a damping material, and soft rubber (butyl rubber) is applied to the vibrating part of the member. By attaching damping materials such as, it is possible to reduce noise sufficiently without using an enclosure.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are merely illustrative examples, not the intention to limit the scope of the present invention thereto, unless otherwise specified. . Figure 1
In the noise reduction device of the compressor unit of the present invention,
FIG. 2 is a diagram showing a schematic configuration of an embodiment of a noise reducing means of a non-explosion proof motor for a non-explosion proof motor. FIG. 2 is a noise of the explosion proof motor for the explosion proof motor of FIG. FIG. 3 is a diagram showing a schematic configuration of an embodiment of the reducing means, FIG. 3 is a view showing another embodiment of FIGS. 1 and 2, and FIG. 3A is a noise reducing means of an explosion-proof and non-explosion-proof motor with a duct. FIG. 4 is a diagram showing a schematic configuration of an embodiment, FIG. 4B is a diagram showing a schematic configuration of an embodiment of noise reduction means for a forced draft type motor, and FIG. 4 is a non-explosion proof equipped with the noise reduction means of the present invention. FIG. 5 is a diagram showing a schematic configuration of additional noise reducing means of a compressor unit including a die motor, and FIG. 5 is a diagram showing a mounting state of casings such as the compressor / motor, the container, and the hydraulic unit in FIG. 4.

FIG. 1 is a diagram showing an embodiment of noise reduction means for a non-explosion proof motor for a noise reduction device for a compressor unit according to the present invention. As shown in FIG. The noise reduction means of the non-explosion proof motor 50 is composed of the fan cover 10a. The fan cover 10a includes the opening cover 11 attached to the bracket 54 and the opening cover 1
1, a sound absorbing material 12 made of a porous member lined with a soft rubber (for example, butyl rubber) 13 provided in a vibrating portion inside thereof, a woven wire mesh structure member 17 covering the front surface of the opening portion with a small ventilation resistance, As shown in the figure, the opening cover 11 has an opening larger than the outer diameter of the intake rotary vane 51, which is a fan, on the front surface of the circular cover. The portion D is provided to increase the opening area for intake air to reduce the flow velocity of the inflowing air, and the reduction of the flow velocity weakens the friction between the intake rotary vanes 51 and the inflowing air to form a noise source. It is intended to reduce the vibration of the rotary blades. A woven wire mesh structure 17 having a small ventilation resistance is provided on the front surface of the opening D to facilitate the inflow of a large amount of air from the opening.

As described above, the sound absorbing material 12 made of a porous member lined inside the opening cover 11 is prepared to absorb the air vibration caused by the air scraping sound by the intake rotary blades and newly The noise of the opening cover 11 forming the noise source is reduced.

According to the actual measurement results, the noise reduction means applied to the non-explosion-proof motor described above gives about 8 to 10 dB.
The reduction result of (A) is obtained.

FIG. 2 is a diagram showing an embodiment of noise reduction means for an explosion-proof motor for a noise reduction device for a compressor unit according to the present invention. As shown in FIG. Type motor noise reduction device has noise reduction cover 15
It consists of a. As shown in FIG. 2, the noise reduction cover 15a is provided with a woven wire mesh structure 17 at the front opening provided outside the existing explosion-proof fan cover 61 of the explosion-proof motor 60.
And a woven wire mesh structure 17 forming an open air contact surface and having a small ventilation resistance.
A sound absorbing material 12 made of, for example, a porous material lined inside the opening cover 16, a vibration damping material 13 made of soft rubber (for example, butyl rubber) attached to the vibration surface of the explosion-proof cover 61, and an explosion-proof cover. It is composed of a vibration damping material 20a provided on the mounting surface to 61.

With the above structure, the existing explosion-proof fan cover 61 forms a new noise source due to the air vibration caused by the rubbing noise of the intake rotary vane 51 with the inflowing air. The noise reducing cover 15a is absorbed by the vibration damping material 13 and the sound absorbing material 12 to enable noise reduction. In addition, according to the measurement result, about 7 to 10 dB
The reduction effect of (A) is obtained.

FIG. 3 shows another embodiment of FIGS. 1 and 2, and FIG. 3A is a diagram showing a schematic structure of one embodiment of noise reducing means for motors with an explosion-proof and non-explosion-proof duct. so,
(B) is a diagram showing a schematic configuration of an embodiment of a noise reduction means of the other force ventilation type motor. In the case of (A) in the figure, the inflow air taken in by the intake rotary vanes 51 is the solid line arrow A.
After passing through the woven wire mesh structure 17 and the sound absorbing body 12 provided at the opening of the cover 18 with a duct, it is introduced into the duct 18a in the direction of the dotted arrow. In this case, the vibration of the cover with duct 18 reduces noise by the sound absorbing body 12, the damping material 13 attached to the inside of the cover with duct (excluding the opening), and the damping material 20a provided in the mounting portion. To do.

Further, FIG. 6B is a diagram showing a schematic construction of an embodiment of noise reducing means in the case where another fan air is blown by a separately prepared fan motor 19a, and the inflow air sucked by the rotary blade 51a is The woven wire mesh structure 17 and the sound absorber 12 provided at the opening of the other force ventilation cover 19 along the solid line arrow B
After passing through, the motor 19b is introduced in the direction of the dotted arrow.
In this case, the vibration of the forced ventilation cover 19 causes the sound absorbing body 12 to vibrate.
Noise is reduced by the vibration damping material 13 attached to the inside (excluding the opening) of the forced ventilation cover 19.

FIG. 4 shows a schematic structure of the additional noise reducing means of the compressor unit comprising the non-explosion proof motor having the noise reducing means of the present invention. As shown in the figure, the compressor unit including the non-explosion proof motor 50 having the noise reducing means is used by being disposed on the exposed base 24.
In that case, it is arranged via the following additional noise reduction means. That is, the compressor 62 that constitutes the compressor unit, the non-explosion-proof motor 50 that performs noise reduction means, and related devices.
For example, containers such as the oil separator 64, piping, and the like are provided directly on the exposure unit base 24 or on the pedestal 21 or the leg-shaped pedestal 22 provided on the pedestal, and the casing 65 and the like are directly attached to the vibration damping member 20.
In addition to being provided via c, a damping material such as soft rubber (butyl rubber) is attached to the vibrating portion of the member to enable sufficient noise reduction without using an enclosure.

FIG. 5 shows how the compressor 62, the non-explosion-proof motor 50, the container 66 such as an oil separator, and the housing 65 such as a hydraulic unit in FIG. 4 are attached. As shown in the figure, the pedestal 21, the housing 65, the container 66, and the leg-shaped pedestal 22 each have a damping material 13 such as soft rubber attached to the surface thereof to prevent the propagation of vibration to the outside, and The vibration damping material 20c is interposed in the mounting of 65.

By the way, in the conventional enclosure type compressor unit, the noise damping value of the conventional enclosure type is the same as that of the conventional type when the sound absorbing material is lined in the enclosure and the damping material is inserted in the lower mounting surface. 25 dB
An experimental result of 30 dB (A) is obtained for (A).

Also from the above results, in the case of the compressor unit provided with the noise reduction means and the additional noise reduction means of the present invention, it is not necessary to mount the enclosure, and the effects such as cost reduction and efficiency of maintenance are improved. Yes, again
Even with one unit having an attenuation effect of 2 to 5 dB (A), in the case of a plurality of units, an effect of 5 to 10 dB (A) or more can be obtained with the synthesized sound.

[0031]

According to the present invention, a noise reduction cover is provided on a non-explosion proof motor by a fan cover having an enlarged opening area, and on an explosion proof motor by a noise reduction cover on an existing explosion proof cover. , A noise reduction means consisting of inserting a sound-absorbing material of a specified thickness between the vibration source and a damping material on the mounting surface, and affixing the damping material to the vibration-generating part of the related equipment and controlling the mounting surface. Due to the additional noise reduction means comprising the insertion of vibrating material, it is possible to obtain a low-cost, high-efficiency compressor unit noise reduction device that does not require the use of an enclosure.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a noise reduction cover for a non-explosion proof motor in a noise reduction device for a compressor unit of the present invention.

FIG. 2 is a diagram showing a schematic configuration of an embodiment of a noise reduction cover for an explosion-proof motor.

FIG. 3 is a diagram showing another embodiment of FIGS. 1 and 2, FIG. 3A is a diagram showing a schematic configuration of a noise reduction cover of an explosion-proof and non-explosion-proof motor with a duct, and FIG. It is a figure which shows schematic structure of the noise reduction cover of a ventilation type motor.

FIG. 4 is a diagram showing a schematic configuration of a compressor unit including the noise reduction device of the present invention.

5 is a diagram showing a mounting state of casings such as a compressor / motor, a container, and a hydraulic unit in FIG.

FIG. 6 is a schematic cross-sectional view showing a schematic configuration of a fully enclosed outer fan type motor.

FIG. 7 is a main-portion cross-sectional view showing a schematic configuration of an enclosure type compressor unit.

[Explanation of symbols]

10a fan cover 11 opening cover 12 Sound absorbing material (sound absorbing body) 13 Damping material (soft butyl rubber) 15a Noise reduction cover 16 opening cover 17 Woven wire mesh structure (woven wire mesh structure member) 18 Cover with duct 19 Other ventilation ducts 20a, 20c damping material 21 stand 22 Leg stand 24 exposed base

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H003 AA00 AB00 AC03 AD01 AD03                       BA05 BA07 CD05                 3H034 AA02 AA18 BB02 CC03 DD02                       DD24 EE06                 3H035 DD04 DD05

Claims (4)

[Claims] 1. A compressor unit comprising a non-explosion-proof motor connected to a compressor body is exposed and installed on a base without being covered by an enclosure (soundproof box). An intake opening larger than the outer circumference of the fan of the fan cover is formed on the outside air intake side for the external fan to enlarge the intake opening, and a sound absorbing material is attached to the intake opening. A noise reducing device for a compressor unit, characterized in that a fan cover having a structure in which a damping material made of butyl rubber) is interposed is provided. 2. A compressor unit in which a compressor body is connected to an explosion-proof motor is exposed and installed on a base without being covered by an enclosure (soundproof box), and the explosion-proof motor is attached to the compressor unit. An air intake opening larger than the outer circumference of the fan of the first fan cover is formed on the outside of the first fan cover, and a sound absorbing material is attached to the air intake opening. A noise reducing device for a compressor unit, wherein a second fan cover having a structure in which a vibration damping material made of butyl rubber) is interposed is provided. 3. A woven wire net structure having a small ventilation resistance, in which a sound absorbing material is lined inside the intake opening, and a vibration damping material made of soft rubber (for example, butyl rubber) is interposed at a portion where vibration is generated. The noise reduction device for a compressor unit according to claim 1 or 2, characterized in that. 4. A container such as an oil separator that constitutes the compressor unit is supported on a unit base through a frame, and a soft surface is formed on the surface of the frame, the container, the piping, the support, and the like that are vibrating bodies. The noise reduction device for a compressor unit according to claim 1, wherein a damping material made of rubber is attached.