JPH05187377A - Package type screw compressor - Google Patents

Abstract

PURPOSE:To reduce noise in a package type screw compressor by shielding with a noise-proof cover a compressor unit installed on a common base, and by shielding the outer peripheral part of the common base with a shielding plate. CONSTITUTION:A compressor unit 6 installed on a common base 4 for a package type screw compressor is shielded by covering it with a noise-proof cover 5. Further, the common base 4 is provided with a mounting part 3 which protrudes toward the outer peripheral part and has a rubber plate 1 attached using mounting bolts 2. Thus, the outer peripheral part of the common base 4 which is not shielded by the noise-proof cover is covered with and shielded by the rubber plate 1. In this way, installation of the rubber plate 1 via the mounting part 3 provides an air space between the common base 4 and the rubber plate 1 and improves noise-proofness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package type screw compressor for reducing noise, and more particularly to a package type screw compressor having a soundproof structure suitable for insulating noise generated from a common base of the compressor.

[0002]

2. Description of the Related Art In a conventional package type screw compressor, as described in Japanese Utility Model Laid-Open No. 54-63505, the equipment installed on the common base is shielded by a soundproof cover. Was exposed.

[0003]

The above-mentioned prior art has a structure in which the noise during operation of the compressor unit installed on the common base is soundproofed or bared, but the outer periphery of the common base is exposed. Therefore, the compressor operating noise is transmitted to the common base by solid propagation, and the noise leaks from the exposed portion of the outer periphery of the common base. Therefore, even if the sound insulation performance of the soundproof cover surrounding the device is improved, there is a problem that the noise value around the package increases due to the noise energy leaked from the outer periphery of the common base.

It is an object of the present invention to provide a package type screw compressor capable of shielding noise generated from the outer peripheral portion of the common base of the compressor to cause a noise value around the package.

[0005]

In order to achieve the above object, the package type screw compressor of the present invention is designed to reduce noise during operation of the compressor by soundproofing the compressor unit installed on the common base. In addition to the one that was shielded by the cover, the periphery of the common base that was not shielded by the soundproof cover was shielded by the sound insulating plate such as a rubber plate. Also, the compressor unit installed on the common base and the peripheral part of the common base are commonly shielded by a soundproof cover.

[0006]

In the package type screw compressor, in order to reduce the operating noise, the compressor unit installed on the common base is covered with a soundproof cover, which allows the airborne noise of the equipment installed on the common base. Is sound-proof with the sound-proof cover, it is impossible to sound-proof the solid-borne noise generated by the vibration of the compressor unit during operation being propagated to the common base with the sound-proof cover. The solid propagating noise generated from the sound source can be shielded by a sound insulating plate such as a rubber plate that covers the outer periphery of the common base. Therefore, both the air propagating noise and the solid propagating noise propagating from the sound source of the compressor unit are prevented. This makes it possible to reduce the noise around the package. Also, by covering the compressor unit installed on the common base and the common base peripheral part with a soundproof cover in common, it is possible to prevent both air-borne noise and solid-borne noise from the sound source of the compressor unit in the same manner as above. Therefore, the noise around the package can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1A is an external front view showing an embodiment of the package type screw compressor according to the present invention, and FIG. FIG. 2 is likewise an external side view. FIG. 3 is a noise measurement data diagram when the rubber plates of FIGS. 1 and 2 are attached. Similarly, FIG. 4 is a noise measurement data diagram in the case of no rubber plate.

In FIGS. 1 and 2, in order to reduce the noise during operation of the compressor unit 6 including the compressor body and the electric motor and piping installed on the common base 4 of the package type screw compressor, a conventional example is used. The soundproof cover 5 for covering the compressor unit 6 alone is soundproofed. However, the soundproof cover 5 is capable of soundproofing the airborne noise of the sound source of the compressor unit 6, however, It is impossible to prevent the solid propagation noise generated by the vibration being propagated to the common base 4, and the noise around the package is dominated by the solid propagation noise generated from the common base 4. Therefore, in the embodiment of the present invention, in order to further shield the solid-borne noise from the common base 4, a mounting seat 3 protruding from the outer periphery of the common base 4 is provided, the rubber plate 1 is mounted by the mounting bolt 2, and the soundproof cover 5 is attached. The outer peripheral portion of the common base 4 which is not shielded by is covered with the rubber plate 1 of the sound insulating plate. If this happens, attach the rubber plate 1 to the mounting bolt 2
When the rubber plate 1 is fixed to the common base 4 in close contact with it, the rubber plate 1 is vibrated by the vibration of the common base 4 and the entire rubber plate 1 vibrates, which may reduce the shielding effect. It is effective to form an air layer between the common base 4 and the rubber plate 1 via the. In FIG. 2, there is a cover 7 for piping and power supply.

In FIGS. 3 and 4, FIG. 3 shows the frequency (Hz) and sound pressure level of noise measurement data at a position 1.5 m away from the front of the package when the rubber plate 1 is attached in FIGS. The relationship of dB (A) is shown, and the noise all-over value is 63 dB (A). 4 is shown in FIG.
2 shows the same relationship of noise measurement data at a position 1.5 m away from the front of the package without the rubber plate 1, and the noise all-over value is 66.6 dB.
(A). As a result, the noise when the rubber plate 1 in FIG. 3 is attached is reduced by 3.6 dB (A) in terms of the all-over value compared to the noise without the rubber plate 1 in FIG.

In the above embodiment, the sound insulation plate of the common base 4 is the rubber plate 1. However, this sound insulation plate is replaced by the steel plate, a damping material having a low vibration transmission rate, or a sound absorbing material such as glass wool or urethane foam. It is also possible to use a material or the like. In the above embodiment, the compressor unit 6 installed on the common base 4 is covered with the soundproof cover 5,
And the common base 4 which is not even shielded by the soundproof cover 5.
Although the outer peripheral portion of the compressor is shielded by the rubber plate 1 of the sound insulating plate, instead of this, the outer peripheral portions of the compressor unit 6 and the common base 4 installed on the common base 4 are commonly used as the soundproof cover 5.
Thus, it is possible to shield both air-borne noise and solid-borne noise during operation of the compressor unit 6 as in the above embodiment.

[0011]

According to the present invention, both air-borne noise and solid-borne noise during operation of the package type screw compressor can be sound-proofed by a simple and inexpensive sound insulation structure. As a result, it is possible to reduce the noise level by about 3 to 4 dB (A) as compared with the noise level of 1. is there.

[Brief description of drawings]

FIG. 1 (a) is an external front view of an embodiment of the present invention,
(B) is an enlarged view of a main part of (a).

FIG. 2 is an external side view of FIG.

FIG. 3 is a noise measurement data diagram of FIG. 1.

FIG. 4 is a noise measurement data diagram without a rubber plate in FIG. 1.

[Explanation of symbols]

1 ... Rubber plate, 2 ... Mounting bolt, 3 ... Mounting seat, 4 ... Common base, 5 ... Soundproof cover, 6 ... Compressor unit.

Claims (5)

[Claims] 1. In a package type screw compressor, in order to reduce noise during operation of the compressor, a compressor unit installed on the common base is shielded by a soundproof cover, and the outer periphery of the common base is not shielded by the soundproof cover. A package type screw compressor characterized in that its part is shielded by a sound insulation plate. 2. In a package type screw compressor, in order to reduce noise during operation of the compressor, a compressor unit installed on the common base is shielded by a soundproof cover, and the outer periphery of the common base is not shielded by the soundproof cover. The package type screw compressor is characterized in that a sound insulating plate mounting seat protruding from the above portion is provided, the shielding plate is fixed by a mounting bolt, and the outer periphery of the common base is shielded by the sound insulating plate. 3. The package type screw compressor according to claim 1, wherein the sound insulation plate is a rubber plate or a steel plate. 4. The package type screw compressor according to claim 1, wherein the sound insulation plate is a sound absorbing material such as glass wool or urethane foam. 5. A package type screw compressor, wherein the compressor unit installed on the common base and the outer periphery of the common base are commonly shielded by a soundproof cover in order to reduce noise during operation of the compressor. Package type screw compressor.