JP2010048089A - Hermetic compressor - Google Patents

Abstract

An object of the present invention is to improve the silencing effect and the efficiency without increasing the number of parts or bulking.
The compression mechanism 200 compresses the gas sucked from outside the sealed container 100 and discharges it to one side 19 partitioned by the compression mechanism 200 of the sealed container, and then discharges it to the outside of the sealed container 100. 200, a cover 9 for covering the discharge gas from the discharge port 7a of the sealed container is provided, and the compressed gas is discharged from the discharge port 7a into the cover 9, and then the lower bearing in the compression mechanism 200, In a hermetic compressor in which a passage 22 communicating with the cylinder and the upper bearing is provided and discharged through the passage 22 to the motor-side space 13 in the sealed container and discharged to the outside of the sealed container 100. And the outlet passage diameter was reduced and the inner passage diameter was increased. In addition, a plurality of passages having such a configuration are provided. Further, each of the plurality of passages having different diameters is configured to have an inflatable silencer structure.
[Selection] Figure 1

Description

  The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor having a silencing structure in which a cover is provided at a discharge port from a compression mechanism housed in a hermetic container into the hermetic container.

Conventionally, the compression mechanism employed in the hermetic compressor as described above is provided with a cover at the discharge port into the sealed container as disclosed in Patent Document 1, and the gas compressed by the compression mechanism is discharged from the discharge port. The sound generated when the reed valve is repeatedly opened and repeatedly discharged in a pulsating manner is kept low. Thereby, silent operation can be performed for use in air conditioning in general living spaces such as homes and vehicles. 10 is a bottom view of a compression mechanism of a conventional compressor, and FIG. 11 is a sectional view of the same gas passage.
Japanese Patent Application Laid-Open No. 07-77186

  As the above-described covers are provided in multiple layers, the silencing effect increases, but it becomes impossible to realize a reduction in productivity due to an increase in the number of parts and a space saving due to an increase in space. In addition, the efficiency of the compression mechanism is reduced due to the multiple cover. While demands for energy saving and space saving in recent years have been increasing, noise reduction by installing a plurality of covers has led to a decrease in efficiency of the compression mechanism, which has hindered energy saving and space saving.

  An object of the present invention is to provide a hermetic compressor that can save space and improve the efficiency of the compression mechanism without impairing the silencing effect of the cover of the compression mechanism.

  In order to achieve the above object, a hermetic compressor according to the present invention includes a compression mechanism having a cylinder, an upper bearing, a lower bearing, and a piston accommodated in a sealed container, and the compression mechanism. And a cover that covers the compressed gas in the cylinder, which is sucked from outside the sealed container, and discharged from the discharge port provided on the side opposite to the motor side of the compression mechanism in the sealed container. After the compressed gas is discharged into the cover from the discharge port, the cover and the cylinder of the compression mechanism portion, the upper bearing, and the lower bearing are configured to communicate with the cover inner space and the motor side space. A gas passage that is provided in the upper bearing, the lower bearing, and the cylinder, and in the hermetic compressor that discharges the compressed gas to the motor side space in the hermetic container, the lower bearing constituting the communicating passage; Above The diameter of the passage of the bearing is made smaller than the diameter of the passage of the cylinder. Moreover, the said structure of the said compression mechanism part was made into two or more, and the dimension which comprised each was made the same. In addition, a plurality of the passages at the rear of the compressor are provided, and the diameters of the passages are different from each other, thereby forming an expansion type muffler structure.

With such a configuration, the sound generated when the gas compressed by the compression mechanism pushes open the reed valve at the discharge port and repeatedly pulsates is first silenced in the cover. Thereafter, since the passage of the compression mechanism portion has an expansion type muffler structure, sound can be effectively reduced even when compressed gas passes through the passage. In addition, by providing a plurality of passages for the compression mechanism section, it is possible to reduce the passage resistance of the discharge gas as well as the silencing effect, reduce the input of the compression mechanism section, and improve the efficiency of the compression mechanism section. . Further, by making the diameters of the passages of the plurality of compression mechanism portions different from each other, the frequency band can be reduced when the sound of a specific frequency is high. As a result, sound can be reduced and space can be saved without installing multiple covers, and energy can be saved by improving the efficiency of the compression mechanism. Therefore, energy-saving and space-saving and quiet operation can be performed when used for air conditioning in general living spaces such as homes and vehicles.

  Hereinafter, a hermetic compressor according to some embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
The hermetic compressor of the first embodiment is for refrigeration, and as shown in FIGS. 1 to 4, a compression mechanism 200 and an electric motor 300 that drives the compression mechanism 200 are accommodated in a hermetic container 100. . The compression mechanism 200 has a cylinder 2, a roller piston 5 accommodated in the cylinder 2, and a set of vanes (not shown) that follow the cylinder. The cylinder 2 is closed by bearing members 8 and 10 fastened to the opening surfaces on both sides thereof by bearing members 8 and 10 to store the roller piston 5, and the roller piston 5 rotates eccentrically with the sliding of the vane. A low-temperature and low-pressure gas refrigerant is sucked and compressed, discharged as a high-temperature and high-pressure gas refrigerant, and repeatedly supplied to the refrigeration cycle. However, the compression method and use of the compression mechanism 200 and the type of fluid to be compressed are not limited to those described above, and are effective when applied to various methods, uses, and compressed fluids. It belongs to the category of the invention.

  Further, the hermetic compressor according to the first embodiment is a vertical type, in which an electric motor 300 is disposed on the upper side, and a compression mechanism 200 is disposed on the lower side. The stator 12 of the electric motor 300 and the cylinder 2 of the compression mechanism 200 are fixed to the inner periphery of the body portion of the sealed container 100 by shrink fitting or welding, and the rotary shaft 3 extending downward from the rotor 11 of the electric motor 300 penetrates the cylinder 2. Then, the roller piston 5 is driven by being supported by the bearing members 8 and 10 and rotated by the electric motor 300.

  The compression mechanism 200 has the suction port 4 on the outer periphery of the cylinder 2 and sucks the refrigerant into the cylinder 2 through the suction pipe 17 connected from the outside of the body of the hermetic container 100 and compresses the refrigerant on the side opposite to the motor side of the compression mechanism. It discharges to the cover 9 from the discharge port 7a provided in the bearing member 10 through the discharge path 7b provided in one place of the inner periphery of the cylinder 2. The discharged gas refrigerant expands once in the cover room. Thereafter, the discharged refrigerant passes through the gas passage 22 of the compression mechanism portion, and is led from the rear portion of the compressor to the upper motor chamber 13 where the compression mechanism 200 in the hermetic container 100 is vertically partitioned for cooling of the motor 300. After that, it is supplied from the upper discharge pipe 14 to the external refrigeration cycle. The refrigerant after being subjected to the refrigeration cycle returns to the suction pipe 18 via the accumulator 15. The lower side of the sealed container 100 is an oil chamber 19 for storing oil.

  In order to guide the gas refrigerant discharged from the discharge port 7 a of the compression mechanism 200 to the motor chamber 13, the cover structure 9 installed in the compression mechanism 200 and the gas passage 22 provided in the compression mechanism unit 200 are used. The cover structure 9 is for reducing the sound generated when the reed valve 20 applied to the discharge port 7a is pushed open every time the refrigerant gas is compressed to a predetermined pressure or higher and repeatedly discharged in a pulsating manner. Similarly, the gas passage 22 provided in the compression mechanism 200 is normally used to guide the discharged gas refrigerant to the motor chamber 13 as shown in the conventional example. In the first embodiment, the gas passages of the compression mechanism portion are each of the diameters φd1 of the passages of the lower bearing 10 and the upper bearing 8 among the passages of the lower bearing 10, the upper bearing 8 and the cylinder 2 constituting the gas passage. And φd3 are made smaller than the diameter φd2 of the passage of the cylinder. At this time, φd1 = φd3 <φd2, or φd1 <φd3 <φd2 or φd3 <φd1 <φd2. With these configurations, the passage of the compression mechanism portion has an expansion-type muffler structure, and the compressed gas is effectively silenced after the sound is silenced in the cover and further passes through the gas passage. Sound can be reduced.

(Embodiment 2)
The second embodiment is shown in FIG. 5 and FIG.
It is something. The dimensions constituting each gas passage are the same for both the first and second gas passages. The hole size of each of the diameters φd1 and φd3 of the passages of the lower bearing 10 and the upper bearing 8 among the passages of the lower bearing 10, the upper bearing 8 and the cylinder 2 is the same as that of the first embodiment. Is smaller than the diameter φd2. At this time, φd1 = φd3 <φd2, or φd1 <φd3 <φd2 or φd3 <φd1 <φd2. In FIG. 5, two gas passages are provided, but a plurality of gas passages may be used with the same specification. As described above, by providing a plurality of passages of the compression mechanism section, it is possible to reduce the passage resistance of the discharge gas as well as the silencing effect, reduce the input of the compression mechanism section, and improve the efficiency of the compression mechanism section. Can do.

(Embodiment 3)
The third embodiment is shown in FIGS. 7 to 9, and has two gas passages at the rear of the compressor, and the diameters of the respective passages have different dimensions. That is, the hole dimensions of the lower bearing 10, the upper bearing 8 and the cylinder 2 constituting the first gas passage 22 are φd11, φd13, and φd12, and the hole sizes of the second gas passage 23 are φd21, φd23, and φd22. In this case, φd11 and φd21, φd13 and φd23, and φd12 and φd22 have different dimensions. However, the relationship between the hole diameters of one gas passage was set in the same manner as in the second embodiment. In FIG. 7, the number of gas passages is two, but a plurality of gas passages having different diameters may be added. Thus, by providing a plurality of passages of the compression mechanism portion with different diameters, the passage resistance of the discharge gas can be reduced, the input of the compression mechanism portion can be reduced, and the efficiency of the compression mechanism portion is improved. In addition, when the sound of a specific frequency is high, it is possible to achieve a dimensional configuration that can reduce the frequency band.

  With such a configuration, the sound generated when the gas compressed by the compression mechanism pushes open the reed valve at the discharge port and repeatedly pulsates is first silenced in the cover. Thereafter, the gas passage of the compression mechanism portion through which the compressed gas passes has an expansion type muffler structure, and sound can be effectively reduced when the compressed gas passes through the passage. In addition, by providing a plurality of passages for the compression mechanism section, it is possible to reduce the passage resistance of the discharge gas as well as the silencing effect, reduce the input of the compression mechanism section, and improve the efficiency of the compression mechanism section. . Further, by making the diameters of the passages of the plurality of compression mechanism portions different from each other, the frequency band can be reduced when the sound of a specific frequency is high. As a result, sound can be reduced and space can be saved without installing multiple covers, and energy can be saved by improving the efficiency of the compression mechanism. Therefore, energy-saving and space-saving and quiet operation can be performed when used for air conditioning in general living spaces such as homes and vehicles.

  As described above, since the hermetic compressor according to the present invention can improve performance and reduce noise, the hermetic compressor can be applied to small to large air-conditioning, refrigerator, or hot water hermetic compressors.

Vertical sectional view of the rotary compressor according to the first embodiment of the present invention. Assembly drawing of rotary compressor lower bearing and reed valve according to Embodiment 1 of the present invention The bottom view of the compression mechanism part concerning Embodiment 1 of this invention Sectional drawing of the gas passage which concerns on Embodiment 1 of this invention The bottom view of the compression mechanism part which concerns on Embodiment 2 of this invention. Sectional drawing of the gas passage which concerns on Embodiment 2 of this invention The bottom view of the compression mechanism part which concerns on Embodiment 3 of this invention. Sectional drawing of the gas passage of the compression mechanism part concerning Embodiment 3 of this invention Sectional drawing of the gas passage of the compression mechanism part concerning Embodiment 3 of this invention Bottom view of the compression mechanism of a conventional compressor Sectional drawing of the gas passage of the compression mechanism part of the conventional compressor

Explanation of symbols

2 Cylinder 3 Rotating shaft 4 Suction port 5 Roller piston 7a Discharge port 9 Cover structure 13 Electric motor chamber 20 Reed valve 21 Cover chamber 22 Gas passage 23 Gas passage 100 Sealed container 200 Compression mechanism 300 Electric motor

Claims (3)

The airtight container is equipped with a compression mechanism having a cylinder, an upper bearing, a lower bearing, and a piston accommodated therein, and an electric motor that drives the compression mechanism, and compresses the gas sucked from outside the airtight container into the cylinder. The cover is discharged from a discharge port provided on the side opposite to the motor side of the compression mechanism in the sealed container, and a cover is provided to cover the cover. After the compressed gas is discharged from the discharge port into the cover, the cover And the cylinder of the compression mechanism part, the upper bearing, and the lower bearing, and a gas passage communicating with the cover inner space and the motor side space is provided in the upper bearing, the lower bearing, and the cylinder, and the compression is performed. In a hermetic compressor that discharges gas into the motor-side space in the hermetic container, a diameter of the passage of the lower bearing and the upper bearing constituting the communicating passage is smaller than a diameter of the passage of the cylinder. Hermetic compressor, characterized in that the. The hermetic compressor according to claim 1, wherein a plurality of the passages of the compression mechanism section have the same dimensions. The hermetic compressor according to claim 1, wherein a plurality of the passages at a rear portion of the compressor are provided, and the diameters of the passages are different from each other.