JPH0693968A - Compressor - Google Patents

Abstract

PURPOSE:To provide a compressor which is prevented from the generation of high noise by amplifying pulsation noise of a refrigerant during operation through resonance of a space in a compressor. CONSTITUTION:Both or one of a suction port 3 and a delivery port 4 for a refrigerant is set to a plural number and arranged on the nodes 5 and 6 of a mode where space resonance of the space of an outer sell 1 occurs and in relation to the node of other mode 7, the suction ports are formed in positions symmetrical to each other.

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 realizing a refrigerating effect by a refrigerating cycle by condensing and expanding the refrigerant.

[0002]

2. Description of the Related Art In recent years, noise reduction has been desired in refrigerators, air conditioners and the like. Therefore, it is strongly demanded that the compressor also have high efficiency and low noise.

A conventional compressor will be described below. Here, a reciprocating type compressor will be described, but basically, another type, for example, a rotary piston type or
The same applies to the scroll type compressor.

As shown in the side sectional view of FIG. 2a and the top sectional view of FIG. 2b, a conventional compressor has, for example, a substantially cylindrical outer shell 1 and a mechanical portion 2 for compressing a refrigerant installed in the outer shell 1 and a refrigerant. And a discharge port 4 for opening the refrigerant into the inner space of the outer shell 1.

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

[0006] In such a conventional structure, the repetitive motion in the compression process of the refrigerant in the mechanical section 2 during operation becomes the pulsation of the refrigerant, which is emitted as pulsating sound from the suction port 3 or the discharge port 4 to cause noise. 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 existing inside. This spatial resonance will be described with reference to FIGS. For simplicity, the space shape is a rectangular parallelepiped as shown in FIG. In such a space,
The first-order spatial resonance has a mode as shown in FIG. Here, the surface 8 near the center is a portion corresponding to a mode node, and the sound pressure in this portion is theoretically zero in the spatial resonance state. Further, on both sides of this node, the sound pressure becomes higher as the distance from the node increases, and the sound pressure becomes highest at the position farthest from the node. The absolute value of sound pressure changes equally on both sides of the node, but the phases are opposite. 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 and higher modes, for example, the fourth mode shown in FIG. 7 becomes a complicated mode in which a plurality of nodes 11 exist.

When a sound source exists in such a space,
The degree of amplification of noise changes depending on the position of the sound source.
That is, in the case of the first-order 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 amplification of the noise will increase as the sound source position moves away from the node 8. .

[0009]

However, in such a conventional structure, since the position of the suction port or the discharge port, which is a noise source, is determined independently of the spatial resonance of the internal space, the spatial resonance of the internal space is suppressed. When a pulsating sound is generated at a position deviating from the node during driving, if the harmonic frequency of the pulsating frequency is close to the spatial resonance frequency, the pulsating sound is amplified due to the spatial resonance, which causes a problem of large noise.

In view of the above circumstances, it is an object of the present invention to provide a compressor in which the pulsating sound is not amplified by the resonance of the inner space of the outer shell to cause a large noise during operation.

[0011]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to provide a plurality of refrigerant suction ports and / or discharge ports inside a compressor,
The compressor is characterized in that it is installed at a position that prevents amplification of pulsating sound due to spatial resonance in the internal space of the compressor.

[0012]

The operation of this technical means is as follows. Install both or one of the suction ports and / or the discharge ports that are the sound source during operation so that they are located at the node of one mode of the spatial resonance modes in question and symmetrically with respect to the nodes of other modes. To do. This allows
Amplification due to resonance does not occur in the mode where the sound source is installed on the node, and there is a sound source at the opposite phase position for the mode where the sound source is installed in a symmetrical position with respect to the node. Noises of opposite phases cancel each other out, and as a result, amplification of noise can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1a is a side sectional view of a compressor in an embodiment of the present invention, and FIG. 1b is a top sectional view. In FIG. 1, 1 is an outer shell of a compressor, 2 is a mechanical part, 3 is a suction port of a refrigerant,
Reference numeral 4 is a refrigerant discharge port. Reference numerals 5, 6 and 7 are nodes of the first, second and third modes of spatial resonance in 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
Pulsating sound is generated from. At this time, since the suction port 3 is installed on the node 5 of the first-order mode and the node 6 of the second-order mode for the spatial resonance of the internal space, the double-frequency of the pulsation is close to or equal to the frequency of the spatial resonance. Even in this case, these spatial resonances are not excited, so that the pulsating sound is not amplified by the spatial resonance and the noise is not increased. Regarding the third-order mode of spatial resonance, since the suction port 3 is located at a position displaced from the node 7 of the third-order mode of spatial resonance in the internal space, the pulsating sound may be amplified by the spatial resonance. However, since the suction port 3 is installed symmetrically with respect to the node 7 of the third-order mode, two modes having opposite phases and the same magnitude are excited by spatial resonance, and they cancel each other out. As a result, generation of noise due to pulsation can be prevented. In the present embodiment, only a plurality of suction ports 3 are provided and installed at a position where amplification of pulsating sound due to spatial resonance is prevented. However, the level of pulsating sound from the discharge port 4 is equal to the level of pulsating sound from the suction port 3. 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 only the discharge port 4 or both the suction port 3 and the discharge port 4 may be provided as long as the same effect can be obtained. Yes.

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

[0016]

As described above, according to the present invention, a plurality of suction ports and / or discharge ports of the refrigerant inside the compressor are provided in plural, and the amplification of the pulsating sound due to the spatial resonance of the internal space of the compressor is prevented. By installing in a position, it is possible to prevent an increase in pulsating sound during operation and reduce noise.

[Brief description of drawings]

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 of a compressor according to an embodiment of the present invention.

2A is a side sectional view of a conventional compressor, and FIG. 2B is a top sectional view of a conventional compressor.

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

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

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

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

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

[Explanation of symbols]

 1 Outer shell of compressor 2 Mechanical part 3 Suction port 4 Discharge port 5,8 Spatial resonance first mode section 6,9 Spatial resonance second mode section 7,10 Spatial resonance third mode mode Clause 11 Clause of the fourth mode of spatial resonance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Iwao 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Takao Yoshimura 3-22, Takaidahondori, Higashiosaka, Osaka Matsushita Chiller Co., Ltd. (72) Inventor Takashi Oyama 3-22 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Chiller Co., Ltd. (72) Kou Akashi 3-22, Takaida Hon-dori, Higashi Osaka City, Osaka Matsushita Chiller Co., Ltd. (72) Inventor Ko Inagaki 3-22 Takaidahondori, Higashi-Osaka City, Osaka Prefecture Matsushita Cold Machinery Co., Ltd.

Claims (1)

[Claims] 1. A plurality of suction inlets and / or discharge outlets for the refrigerant inside the compressor are provided in plurality, and the refrigerant is installed at a position where amplification of pulsating sound due to spatial resonance in the internal space of the compressor is prevented. Compressor.