JP3098870B2 - Compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for compressing a refrigerant when a refrigeration effect is achieved by a refrigeration cycle based on condensation and expansion of the refrigerant.

[0002]

2. Description of the Related Art In recent years, low noise has been desired for refrigerators, air conditioners and the like. Therefore, there is a strong demand for a compressor that has high efficiency and low noise.

[0003] A conventional compressor will be described below. Here, a reciprocating type compressor will be described, but basically other types, for example, a rotary piston type,
The same applies to the scroll type compressor.

As shown in a side sectional view of FIG. 2A and a top sectional view of FIG. 2B, a conventional compressor has, for example, a substantially cylindrical outer shell 1 and a mechanical part 2 for refrigerant compression installed inside the outer shell 1 and a refrigerant. And a discharge port 4 that opens the refrigerant into the inner space of the outer shell 1 and the like.

[0005] In the compressor configured as described above,
During operation, the refrigerant taken into the mechanical unit 2 from the suction port 3 was compressed inside the mechanical unit 2 and sent to the next step of the refrigeration cycle. Further, the refrigerant that has returned from the refrigerating cycle to the compression step is released from the discharge port 4 into the inner space of the outer shell 1, and has again moved to the compression step.

In such a conventional configuration, the repetitive motion in the compression process of the refrigerant in the mechanical unit 2 during operation causes pulsation of the refrigerant, which is released from the suction port 3 or the discharge port 4 as pulsation noise, and noise is generated. Was the source.

A space such as the inner space of the outer shell 1 has a spatial resonance frequency determined by conditions such as its shape, volume, and gas present inside. This spatial resonance will be described with reference to FIGS. For the sake of simplicity, the spatial shape is a rectangular parallelepiped as shown in FIG. In such a space,
The first-order spatial resonance is in a mode as shown in FIG. Here, the surface 8 near the center is a portion corresponding to a node of the mode, and the sound pressure of this portion is theoretically zero in a spatial resonance state. Further, on both sides of this node, the sound pressure increases as the distance from the node increases, and the sound pressure increases at a position farthest from the node. Note that the absolute value of the sound pressure changes equally on both sides of the node, but the phase is reversed. The secondary and tertiary spatial resonance modes are as shown in FIGS. 5 and 6, and the basic phenomenon is the same as the primary mode. In the fourth or higher order mode, for example, a complicated mode in which a plurality of nodes 11 are present as in the fourth order mode shown in FIG.

When a sound source exists in such a space,
The degree of noise amplification changes depending on the position of the sound source.
That is, in the case of the primary mode shown in FIG. 4, if the sound source is located near the node 8, the noise of this frequency will not be amplified, but the noise will increase as the position of the sound source moves away from the node 8. .

[0009]

However, in such a conventional configuration, the position of the suction port or the discharge port serving as a noise source is determined independently of the spatial resonance of the internal space. When a pulsation sound is generated at a position deviated from the node and the pulsation sound is generated during operation, if the harmonic frequency of the pulsation frequency and the spatial resonance frequency are close to each other, the pulsation sound is amplified by the spatial resonance, resulting in a problem that a large noise is generated.

In view of the above circumstances, an object of the present invention is to provide a compressor in which pulsation noise is not amplified due to resonance of the inner space of the outer shell during operation and no large noise is generated.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problem, the technical means of the present invention is to provide a compressor having a plurality of refrigerant suction ports and / or discharge ports inside a compressor,
The compressor is installed at a position to prevent pulsation noise from being amplified due to spatial resonance in the internal space of the compressor.

[0012]

The operation of this technical means is as follows. A plurality of inlets and / or outlets, which are sound sources during operation, are installed in multiple positions and are located at the node of one of the spatial resonance modes in question and symmetrically with respect to the nodes of the other mode. I do. This allows
In the mode where the sound source is installed on the node, amplification by resonance does not occur, and in the mode in which the sound source is installed symmetrically with respect to the node, the sound source is located exactly in the opposite phase. The noises of opposite phases cancel each other, and as a result, amplification of noise can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1a is a side sectional view of a compressor according to an embodiment of the present invention, and FIG. 1b is a top sectional view. In FIG. 1, 1 is the outer shell of the compressor, 2 is the mechanical part, 3 is the refrigerant inlet,
Reference numeral 4 denotes a refrigerant discharge port. Reference numerals 5, 6, and 7 denote nodes of the first, second, and third-order modes of the spatial resonance of the inner space of the outer shell 1, respectively.

In the compressor configured as described above,
The pulsation of the refrigerant occurs due to the compression process during operation, and the suction port 3
A pulsating sound is generated from the sound. At this time, since the suction port 3 is placed on the node 5 of the first mode and the node 6 of the second mode in the spatial resonance of the internal space, the harmonic frequency of the pulsation is close to or coincides with the frequency of the spatial resonance. Even in this case, these spatial resonances are not excited, so that the pulsation sound is not amplified by the spatial resonances, and the noise does not increase. In addition, in the third mode of spatial resonance, since the suction port 3 is located at a position shifted from the node 7 of the third mode of spatial resonance in the internal space, pulsation noise may be amplified by spatial resonance. However, since the suction port 3 is installed at a position symmetrical with respect to the node 7 of the third mode, two modes having opposite phases and the same magnitude are excited by spatial resonance, and they cancel each other. As a result, generation of noise due to pulsation can be prevented. In the present embodiment, only the suction port 3 is provided with a plurality of suction ports, and the suction port 3 is installed at a position where amplification of pulsation sound due to spatial resonance is prevented. Alternatively, in the case of a large size, the same applies to the discharge port 4. Further, although the suction port 3 is shown in the present embodiment, it is needless to say that the same effect may be obtained with only the discharge port 4 or both the suction port 3 and the discharge port 4. No.

As described above, according to this embodiment, amplification of pulsation noise due to spatial resonance can be prevented, and increase in noise during operation can be prevented.

[0016]

As described above, according to the present invention, the refrigerant suction port and / or the discharge port inside the compressor are provided with a plurality, and the amplification of the pulsating noise due to the spatial resonance of the internal space of the compressor is prevented. By installing at the position, pulsation noise during operation can be prevented from increasing and noise can be reduced.

[Brief description of the drawings]

FIG. 1A is a side sectional view of a compressor according to an embodiment of the present invention. FIG. 1B is a top sectional view of a compressor according to an embodiment of the present invention.

2A is a side cross-sectional view of a conventional compressor. FIG. 2B is a top cross-sectional view of a conventional compressor.

FIG. 3 is a perspective view of a rectangular box for explaining spatial resonance.

FIG. 4 is a schematic diagram of a sound pressure distribution in a first-order spatial resonance of a rectangular box.

FIG. 5 is a schematic diagram of a sound pressure distribution in a secondary spatial resonance of a rectangular box.

FIG. 6 is a schematic diagram of a sound pressure distribution in a third-order spatial resonance of a rectangular box;

FIG. 7 is a schematic diagram of a sound pressure distribution in a fourth-order spatial resonance of a rectangular box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer shell of a compressor 2 Machine part 3 Inlet 4 Discharge port 5,8 Node of the first-order mode of spatial resonance 6,9 Node of the second-order mode of spatial resonance 7,10 Third-order mode of the spatial resonance Clause 11 Fourth-order mode of spatial resonance

Continued on the front page (72) Inventor Kazuaki Iwao 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Inside the company (72) Inventor Takashi Koyama 3-22, Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Kou Inagaki 3-22 Takaida Motodori, Higashiosaka City, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) F04B 39/00 101 F04B 39/12 101

Claims (1)

(57) [Claims] 1. A refrigerant suction port and / or a discharge port inside a compressor are provided with a plurality of suction ports and / or discharge ports, and are installed at positions where amplification of pulsation noise due to spatial resonance in a compressor internal space is prevented. Compressor.