JPH0828480A - Multi-cylinder rotary compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] The resonance type silencer chamber in the middle of the discharge path uses the existing space to reduce the number of man-hours required to process the parts of the compression mechanism and effectively reduce noise. A multi-cylinder rotary compressor is provided. [Constitution] Main bearing 4, first cylinder 5, partition plate 6, second
A discharge path 16 that connects the cylinder 7 and the auxiliary bearing 8 is provided,
In the middle of the discharge path 16, a bolt hole 18-1 of a fastening portion between the main bearing 4 and the first cylinder 5 near the discharge path 16 is used as a space portion independent of the discharge path 16. -Space 18a near the bolt head of
The discharge passage 16 and the discharge passage 16 are communicated with each other through a passage 17-1. Alternatively, by using the bolt hole 18-2 of the second cylinder 7 near the discharge passage 16, the space portion 18b and the discharge passage 16 are communicated with each other through the passage 17-2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder rotary compressor, and more particularly, it is applied to a silencer structure of a multi-cylinder rotary compressor, and is suitable for providing a refrigerating and air-conditioning device with low noise and high reliability. Multi-cylinder rotary compressor.

[0002]

2. Description of the Related Art In recent years, compressors mounted on refrigerating and air-conditioning equipment are required to have space saving and high reliability in addition to basic performance such as low vibration, low noise and high efficiency.
Therefore, many high-efficiency rotary compressors are installed horizontally to improve space saving. For example, the compressor installed in a conventional general refrigerator is a horizontal rotary compressor having one cylinder.

However, in recent years, in response to the market demand for lower vibration and lower noise, development of a two-cylinder rotary compressor effective for reducing the vibration of the compressor has been advanced. A two-cylinder compressor has two eccentric parts whose rotating shafts are 180 ° out of phase with each other, and two rollers (rolling pistons) fitted in these eccentric parts rotate eccentrically in the cylinder. Is. Therefore, fluctuations in the gas compression torque generated in the two sets of pump parts (compression device parts) are leveled and vibration of the compressor is reduced. As an example of a two-cylinder horizontal rotary compressor, for example, a two-cylinder horizontal rotary compressor described in Japanese Utility Model Laid-Open No. 1-88092 is known.

[0004]

However, the two-cylinder rotary compressor has a problem that the number of discharge ports is increased as compared with the conventional one-cylinder rotary compressor, so that the noise due to the discharge of the compressed gas becomes high. . Therefore, in order to reduce the noise generated when the compressed gas passes through the discharge passage, for example, in Japanese Patent Laid-Open No. 64-8390, a first discharge passage corresponding to the discharge port of the first cylinder, A second discharge passage corresponding to the discharge port of the second cylinder is provided, and the first and second resonance chambers and the connection passage are provided in the middle of each of the first and second discharge passages. There is.

In the above-mentioned conventional technique, the resonance chamber must be formed in the first and second cylinders or the partition plate, and it has not been sufficiently taken into consideration that a great number of man-hours are required to process the parts of the compression mechanism.

The present invention has been made to solve the above-mentioned problems of the prior art. An object of the present invention is to use a resonance type silencer chamber in the middle of a discharge path by utilizing an existing space portion. An object of the present invention is to provide a multi-cylinder rotary compressor that can reduce the number of man-hours required to process the components of the compression mechanism and effectively reduce noise.

[0007]

In order to achieve the above object, a multi-cylinder rotary compressor according to the present invention has a structure in which a crankshaft having two eccentric parts and a eccentric part are fitted. The first roller and the second roller, and the first roller and the second roller as the crankshaft rotates.
A first cylinder and a second cylinder whose rollers rotate eccentrically; a partition plate which partitions the first cylinder and the second cylinder; a main bearing which supports the crankshaft and also serves as a side plate of the first and second cylinders; A discharge mechanism for accommodating the main bearing, the first cylinder, the partition plate, the second cylinder, and the sub-bearing in which a compression mechanism section including a sub-bearing and an electric motor section directly connected to the crankshaft are housed in a closed container. With a route,
In a multi-cylinder rotary compressor provided with a passage communicating with a space portion independent of the discharge passage in the middle of the discharge passage, the independent space portion uses a bolt hole in the vicinity of the discharge passage. The space portion near the head of the bolt is communicated with the discharge path.

[0008]

The function of the above technical means is as follows. In the multi-cylinder rotary compressor of the present invention, a discharge passage that connects the main bearing, the first cylinder, the partition plate, the second cylinder, and the sub bearing is provided, and the main bearing, the first A resonance type silencer in which a bolt hole for fastening a cylinder, or a partition plate, and a space portion near a bolt head of a bolt hole for fastening the second cylinder to the main bearing communicate with the discharge passage by a passage. With this configuration, it is possible to reduce the number of man-hours required to process the parts of the compression mechanism portion, reduce the sound in a certain frequency band, and reduce the noise.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9. First, the general configuration and function of a multi-cylinder rotary compressor to which each embodiment of the present invention is applied will be described with reference to FIG. FIG. 9 is a vertical sectional view of a two-cylinder rotary compressor to which the present invention is applied. 2 shown in FIG.
The cylinder rotary compressor is configured such that an electric motor unit and a compression mechanism unit including two sets of pumps directly connected to the electric motor by a crankshaft are housed in the closed casing 1.

The electric motor section is composed of a stator 2 fixed to a closed container 1 and a rotor 15 fitted with a crankshaft. The compression mechanism section has two sets of rotary compression devices (pump sections), and the first pump section supports the crankshaft 3 and also serves as a side plate of the first cylinder 5, the main bearing 4 and the first cylinder. 5 and a partition plate 6, and the second pump portion is configured by an auxiliary bearing 8 that supports the partition plate 6, the second cylinder 7, the crankshaft 3 and also serves as a side plate of the second cylinder 7. . The main bearing 4 is fixed to the closed container 1.

The crankshaft 3 has two eccentric portions 13 and 14 that are 180 ° out of phase with each other, and two rollers 10a and 10b fitted in these eccentric portions 13 and 14, respectively.
However, as the crank shaft 3 rotates, the first cylinder 5 and the second cylinder 7 are eccentrically rotated. Following the rotation of these rollers 10a, 10b, the vanes 12a, 12b reciprocate in the respective cylinders 5, 7,
The structure is such that the refrigerant gas is alternately compressed.

Next, the silencer structure of this embodiment will be described with reference to FIGS. [Embodiment 1] FIG. 1 is a partially cutaway perspective view illustrating a fastening structure of a compression mechanism portion in a two-cylinder rotary compressor according to an embodiment of the present invention, and FIG. 2 is related to an embodiment of the present invention. First of the compression mechanism part in the two-cylinder rotary compressor
FIG. 3 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a cylinder.
A partially broken perspective view showing a silencer structure using a bolt hole of a second cylinder of a compression mechanism portion in a cylinder rotary compressor, FIG. 4 is a schematic diagram illustrating the concept of a resonance type silencer, and FIG. 5 is a resonance type silencer. 3 is a noise attenuation characteristic diagram of FIG.

First, the fastening structure of the compression mechanism portion in the two-cylinder rotary compressor to which this embodiment is applied will be described with reference to FIG. The reference numerals of the constituent parts of the compression mechanism portion shown in FIG. First, the main bearing 4 and the first cylinder 5 are provided in a plurality of bolt holes (bolt holes) 18-1 penetrating these parts and a plurality of screws 20-.
Fasten through 1. Next, the partition plate 6 and the second cylinder 7 are fastened to the main bearing 4 by passing a plurality of screws 20-2 through a plurality of bolt holes (bolt holes) 18-2.

In FIG. 1, bolt holes 18-1 and 18-2 near the discharge path 16 and screws 20-1 and 20 are provided.
-2 is shown broken. In FIG. 1, 18a, 1
8b is a space for bolt heads (screw heads), 1
Reference numeral 7-1 is a passage that connects the space portion 18a and the discharge passage 16, and 17-2 is a passage that connects the space portion 18b and the discharge passage 16. Further, in addition to the fastening of the sub bearing 8, the sub bearing cover 9 and the main bearing cover 11 (see FIG. 9) are fastened to the structure of the compression mechanism portion, but the illustration and description thereof will be omitted here.

Next, the silencer structure of this embodiment will be described with reference to FIGS. 2 and 3,
To simplify the drawing, the illustration of screws (bolts) is omitted. Further, in the figure, the same reference numerals as those in FIG. 1 indicate the same parts. In the first pump portion, the compressed refrigerant gas is discharged from the discharge port (not shown) of the main bearing 4,
The refrigerant gas passes through the discharge passage 16 provided through the main bearing 4, the first cylinder 5, the partition plate 6, the second cylinder 7, and the auxiliary bearing 8 shown in FIG. Bolt hole 18 used when tightening the main bearing 4 and the first cylinder 5
By providing the passage 17-1 that connects the discharge passage 16 with the space 18a formed near the head of the -1 bolt (not shown), the space can be used as a resonance silencer.

Similarly, as shown in FIG. 3, a bolt hole 18-2 used when tightening the first pump portion and the second cylinder 7 is also a space formed near the head of a bolt (not shown). Passage 1 communicating with the portion 18a and the discharge passage 16
By providing 7-2, the same space portion can also be used as a resonance type silencer. The space portion of the through bolt for tightening the main bearing 4, the first cylinder 5, the partition plate 6, the second cylinder 7, the sub bearing 8, and the sub bearing cover 9 can also be a resonance silencer.

The resonant silencer structure is represented in FIG. In FIG. 4, S is the cross-sectional area of the discharge passage 16 through which the compressed gas flows in the direction of the broken line, and l is the passage 17 (17-1, 1).
7-2) (generic name of 7-2), a is a radius of a small tube associated with the passage 17, A is a cross-sectional area of the small tube, V is a space portion 18a, 18b formed near a bolt head of a bolt hole, and the like. Is the volume of.

The silencer structure shown in FIG. 2 or FIG. 3 has the same operation as the resonance type silencer shown in the schematic view of FIG. 4, and the frequency band sound represented by the following equations (1) and (2) It is possible to reduce the frequency band sound in the vicinity thereof. Further, the noise reduction amount by the structure of the present embodiment is calculated by the formula (3)
Can be represented by For example, according to one embodiment of the present invention, l = 0.8 mm, S = 12.56 mm ² , V =
It is 183.23 mm ³ , and an effect of reducing the frequency band sound near 3500 Hz shown in FIG. 5 by about 6 dB is expected.

[0019]

[Equation 1]

[Equation 2]

(Equation 3) Here, a: small pipe (passage) radius, l: small pipe (passage) length, β: pipe end correction value (= 0.85), A: small pipe (passage) cross-sectional area, S: pipe (discharge path) The cross-sectional area.

According to this embodiment, the discharge passage 16 is provided in the compression mechanism portion of the two-cylinder rotary compressor, and the discharge passage 16 is provided.
By providing a resonance type silencer mechanism using the space 18a, 18b of the bolt hole in the middle of the process, there is provided a two-cylinder rotary compressor and a refrigeration / air-conditioning device which have a noise reduction effect, low vibration, low noise and high reliability. can do.
As shown in FIG. 2, only the silencer structure using the bolt hole 18-1 of the first cylinder 5 or the bolt hole 18- of the second cylinder 7 as shown in FIG.
It is needless to say that even a silencer structure using 2 has a corresponding noise reduction effect, and that it is even more effective if both are combined as shown in FIG.

In the present embodiment, the discharge passage 16 is provided near the bolt hole 18-1 for fastening the main bearing 4 and the first cylinder 5, or the partition plate 6 and the second cylinder 7 are connected to the main bearing. It is set so as to be located in the vicinity of the bolt hole 18-2 for fastening to the fourth side (fastening to the first pump portion), the discharge passage 16, the bolt hole 18-.
The positions of 1, 18-2 are selected in consideration of the formation of a resonance type silencer.

[Embodiment 2] Further, in the present invention, it is possible to have a plurality of resonance type silencer structures depending on how to select a space portion, and it is possible to reduce sound in a wide range of frequency bands. FIG. 6 is a partially broken perspective view showing a silencer structure using a bolt hole of a compression mechanism portion in a two-cylinder rotary compressor according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 and FIG. 3 are the same parts as those in the previous embodiment, and therefore their explanations are omitted.

In the embodiment shown in FIG. 6, the discharge passage 16 is provided with passages that communicate with a plurality of independent spaces. That is, the space 17a formed near the bolt head of the bolt hole 18-1 used for tightening the main bearing 4 and the first cylinder 5 and the passage 17-1 for communicating the discharge passage 16 with each other, 1 pump part and 2nd cylinder 7
The space 18a formed in the vicinity of the bolt head of the bolt hole 18-2 used when tightening and the discharge path 1
6, a passage 17-2 communicating with 6, a bolt hole 18-1 at the boundary between the main bearing 4 and the first cylinder 5, and a passage 17-0 communicating with the discharge passage 16, the partition plate 6 and the second cylinder 7. It further comprises a bolt hole 18-1 at the boundary with the passage 17-3 for communicating the discharge passage 16.

[Embodiment 3] Next, FIG. 7 is a partially broken perspective view showing a silencer structure using a bolt hole of a compression mechanism portion in a two-cylinder rotary compressor according to still another embodiment of the present invention. is there. In the figure, those having the same reference numerals as those in FIG. 6 are the same parts as those in the previous embodiment, and therefore their explanations are omitted. In the embodiment of FIG. 7, the passage 17-1 and the passage 17-2 of the embodiment of FIG. 6 are provided, and the passage 17-0 and the passage 1 are provided.
It does not have 7-3. This example corresponds to the one shown in FIG. Also in this embodiment, it is possible to reduce noise in a wide range of frequency band sounds.

[Fourth Embodiment] FIG. 8 is a partially cutaway perspective view showing a silencer structure using bolt holes of a compression mechanism portion in a two-cylinder rotary compressor according to still another embodiment of the present invention. is there. In the figure, those having the same reference numerals as those in FIG. 6 are the same parts as those in the previous embodiment, and therefore their explanations are omitted. In the embodiment of FIG. 8, the passage 17-1 and the passage 17-3 of the embodiment of FIG. 6 are provided, and the passage 17-0 and the passage 1 are provided.
It does not have 7-2. Also in this embodiment, it is possible to reduce noise in a wide range of frequency band sounds.

The passage 1 communicating with the discharge passage 16
7 (17-0 to 17-3) can be formed by machining, but can be integrally formed with a mold by using the first cylinder and the second cylinder as a sintered material. As a result, it is possible to reduce the number of man-hours required to process the parts of the compression mechanism section as compared with the conventional machine, and it is possible to reduce the noise. For example, since the conventionally required soundproof material can be removed, the temperature of the compressor can be reduced. It is possible and has an advantage in reliability.

Although each of the above embodiments has been described with reference to a two-cylinder rotary compressor, the present invention is not limited to this.
It is applicable to a multi-cylinder rotary compressor having two or more pump parts.

[0028]

As described in detail above, according to the present invention, the resonance type silencer chamber in the middle of the discharge path is provided so as to utilize the existing space, and the man-hours required to process the parts of the compression mechanism are increased. It is possible to provide a multi-cylinder rotary compressor that reduces noise and effectively reduces noise.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view illustrating a fastening structure of a compression mechanism portion in a two-cylinder rotary compressor according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a first cylinder of a compression mechanism section in a two-cylinder rotary compressor according to an embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a second cylinder of a compression mechanism section in a two-cylinder rotary compressor according to an embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating the concept of a resonance silencer.

FIG. 5 is a noise attenuation characteristic diagram of the resonance silencer.

FIG. 6 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a compression mechanism portion in a two-cylinder rotary compressor according to another embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a compression mechanism portion in a two-cylinder rotary compressor according to still another embodiment of the present invention.

FIG. 8 is a partially cutaway perspective view showing a silencer structure using a bolt hole of a compression mechanism portion in a two-cylinder rotary compressor according to still another embodiment of the present invention.

FIG. 9 is a vertical sectional view of a two-cylinder rotary compressor to which the present invention is applied.

[Explanation of symbols]

1 ... airtight container, 3 ... crankshaft, 4 ... main bearing, 5 ... first
Cylinder, 6 ... Partition plate, 7 ... Second cylinder, 8 ... Secondary bearing, 10a ... First roller, 10b ... Second roller, 12a
... 1st vane, 12b ... 2nd vane, 13 ... 1st eccentric part, 14 ... 2nd eccentric part, 15 ... Rotor, 16 ... Discharge path, 17, 17-0, 17-1, 17-2, 17-3 ...
Passage, 18, 18-1, 18-2 ... Bolt hole, 18
a, 18b ... Space portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Ishiyama 800 Tomita, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Hitachi, Ltd. Living Equipment Division Cooling & Heat Headquarters (72) Inventor Junichi Miyama Ohira-cho, Shimotsuga-gun, Tochigi 800 Tomita, Hitachi, Ltd.

Claims (5)

[Claims] 1. A crankshaft having two eccentric parts, a first roller and a second roller fitted in the two eccentric parts, and the first roller and the second roller in accordance with the rotation of the crankshaft. Eccentrically rotating a first cylinder and a second cylinder, a partition plate for partitioning the first cylinder and the second cylinder, a main bearing and a sub-bearing which support the crankshaft and also serve as side plates of the first and second cylinders. A compression mechanism portion including a bearing and an electric motor portion directly connected to the crankshaft are housed in a closed container, and the main bearing, the first cylinder, the partition plate, the second cylinder,
In a multi-cylinder rotary compressor having a discharge passage communicating with a sub-bearing and a passage communicating with a space portion independent of the discharge passage in the middle of the discharge passage, the independent space portion is the discharge passage. A multi-cylinder rotary compressor characterized in that a space near the bolt head of the bolt hole is communicated with the discharge path by using a bolt hole near the space. 2. The multi-cylinder rotary compressor according to claim 1, wherein the space portion independent of the discharge path is a space portion of a bolt hole in a fastening portion between the main bearing and the first cylinder. 3. The multi-cylinder rotary compressor according to claim 1, wherein the space portion independent of the discharge path is a space portion of a bolt hole in a fastening portion between the second cylinder and the main bearing side. 4. The multi-cylinder rotary compressor according to claim 1, wherein the discharge path is provided with passages that respectively communicate with a plurality of independent space portions. 5. A crankshaft having two eccentric parts, a first roller and a second roller fitted in the two eccentric parts, and the first roller and the second roller associated with rotation of the crankshaft. Eccentrically rotating a first cylinder and a second cylinder, a partition plate for partitioning the first cylinder and the second cylinder, a main bearing and a sub-bearing which support the crankshaft and also serve as side plates of the first and second cylinders. A multi-cylinder rotary compressor in which a compression mechanism section including a bearing and an electric motor section directly connected to the crankshaft are housed in a sealed container, wherein the main bearing, the first cylinder, the partition plate, and the second cylinder. ,
A discharge passage communicating with the sub bearing is provided near the bolt hole for fastening the main bearing and the first cylinder, or a bolt hole for fastening the partition plate, the second cylinder, and the sub bearing to the main bearing. A multi-cylinder rotary compressor, characterized in that it is provided in the vicinity of.