JP3124161B2 - Hermetic 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 hermetic compressor in which gas compressed by a compression mechanism is discharged from a discharge pipe to an outside of a hermetic housing through a cylindrical discharge chamber provided at an upper portion of the hermetic housing. .

[0002]

2. Description of the Related Art In air conditioners, refrigeration systems, etc., a refrigeration cycle is constructed using a hermetic compressor. The hermetic compressor has a structure in which a compressor section (compression mechanism) for compressing gas and a motor are housed in a hermetic housing.

[0003] These two parts are connected via a drive shaft, so that the rotational force of the motor is transmitted to the compressor part to drive the compressor part. In the hermetic compressor, in order to reduce pulsation, as shown in FIG. 5, a cylindrical discharge chamber-b is formed in an upper portion of a hermetic housing a, and a compressor section c is formed in the discharge chamber-b. The discharge of the discharge gas from is performed.

The discharge gas in the discharge chamber-b is discharged to the outside through a discharge pipe d connected to the discharge chamber-b. Conventionally, the discharge pipe d is usually connected to the center of the upper part of the closed housing a as shown in FIGS. 5A and 5B in consideration of workability.

[0005]

Meanwhile [0007], the discharge chamber b is formed between the cylindrical closed space, FIG. 6 (a), the
FIG. 7 shows an acoustic mode A in which a predetermined radial position of the discharge chamber b as shown in (b) is a node e, and a central portion of the discharge chamber b and peripheral sides surrounding it are abdominal portions f and g, FIG.
There is an acoustic mode B in which the center in the height direction of the discharge chamber b as shown in (a) and (b) is a node part i and the upper and lower parts of the discharge chamber b are abdominal parts j and k. I knew I was doing it.

However, according to the conventional connection of the discharge pipe d, the position of the opening end (discharge pipe entrance) of the discharge pipe d facing the discharge chamber b in the acoustic mode A is the central abdomen (+) f. In acoustic mode B, the upper abdomen (+) j
It is in.

For this reason, the pulsation of the discharged gas entering the discharge chamber-b increases at a frequency corresponding to the above-mentioned acoustic mode A and acoustic mode B (resonance). Therefore, the conventional hermetic compressor propagates a large pulsation to the discharge pipe d.

[0008] Such a large pulsation of the discharged gas propagates through the pipe, and causes a disadvantage that large pulsation noise is emitted from a refrigeration cycle device (for example, an outdoor heat exchanger in an air conditioner) connected to the hermetic compressor. Would.

The present invention has been made in view of such circumstances, and an object thereof is to provide a discharge chamber.
It is an object of the present invention to provide a hermetic compressor capable of reducing the pulsation of the discharge gas in the compressor.

[0010]

According to a first aspect of the present invention, there is provided a hermetic compressor according to the first aspect, wherein an end of the discharge pipe connected to the discharge chamber has a radius of the discharge chamber of R and a height of R. H, the radial dimension from the center of the discharge chamber of the open end of the discharge pipe facing the discharge chamber to r, the discharge of the open end of the discharge pipe facing the discharge chamber.
When the insertion dimension into the exit chamber is h, r / R =
2/3, h / H = 1/2.

[0011]

[0012]

[Action] According to the hermetic compressor according to claim 1, the open end of the discharge pipe, to be set in the node portion of the acoustic modes, pulsation of discharged gas leading to the discharge pipe from the discharge chamber decreases . Moreover, the pulsation reduction effect appears most effectively
You.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 1 shows a hermetic compressor to which the present invention is applied, for example, a scroll compressor.
Is a sealed housing.

The closed housing 1 is formed in a cylindrical shape extending vertically. A discharge cover 2 is provided on the upper side of the sealed housing 1 so as to partition the upper and lower directions. This discovery cover
With reference to 2, the inside of the sealed housing 1 has a high pressure side 3 in the upper part of the sealed housing 1 and a low pressure side 4 in the lower part.

A motor 5 is disposed on the lower side of the low-pressure side 4 of the sealed housing 1, and a scroll type compressor unit 6 (compression mechanism) is disposed on the upper side. A rotating shaft 7 (rotating shaft) is provided between the two.

The motor 5 has a stator 8 which is press-fitted and supported in the inner peripheral portion of the closed housing 1 and a rotor 9 which is arranged in the inner cavity of the stator 8. I have. The rotor 9 is fixed to the lower part of the rotating shaft 7 so that rotation is output from the rotating shaft 7. The terminal 10 connected to the stator 8 is provided on the outer periphery of the sealed housing 1.

The scroll type compressor unit 6 has an aluminum fixed scroll 11 made of, for example, an aluminum member, and an aluminum swivel scroll 16 combined with the fixed scroll 11.

That is, the fixed scroll 11 is attached to the end plate 1.
2. A spiral wrap 1 erected on the inner surface of the end plate 12
3, and a peripheral wall 14 erected so as to surround the wrap 13. A discharge port 15 is provided at the center of the end plate 12.

The revolving scroll 16 has an end plate 17 and a spiral wrap 18 erected on the inner surface thereof. The end plate 17 has a cylindrical boss 19 at the center of the outer surface. The fixed scroll 11 and the turning scroll 16
Means that the wraps 13 and 18 are combined so as to shift and engage with each other by 180 degrees (predetermined angle), and a crescent-shaped plurality of wraps between the wraps surrounded by the end plate portions for establishing a compression process. Each closed space 20 is constituted.

The combined scrolls 11, 16 are
Between the discharge cover 2 and the casing-like main frame 21 fixed to the upper side of the low-pressure side 4, the fixed scroll 11 is located above and the revolving scroll 16 is located below. It is interposed in the arranged state.

The end plate 12 of the revolving scroll 16
Is a horizontal receiving surface 2 formed on the upper surface of the main frame 21.
It is slidably received at 1a. Fixed scroll
The frame 11 is supported by a peripheral wall portion 21b formed on the outer peripheral side of the main frame 21 via a support spring 22 so as to be vertically displaceable. More specifically, the fixed scroll 11 is provided with a bracket 23 projecting to the side of the peripheral wall portion 21b. And this bracket 23
Are fixed to the upper portion of the peripheral wall portion 21 via the support spring 22.

A suction port (not shown) provided on the peripheral wall 14 of the fixed scroll 11 has a space 2 on the side of the peripheral wall 14.
9. A suction passage (not shown) provided on the main frame 21 and communicating with both sides of the frame 21. The suction passage 30 communicates with the suction pipe 30 connected to the outer periphery of the closed housing 1 through the low pressure side 4. The gas can be guided to the compressor section 6 from the outside.

A drive bush 25 is fitted into the boss 19 of the turning scroll 16 via a turning bearing 24. The drive bush 25 has a slide hole 25a formed by a through hole slightly extending in the radial direction.

The upper end of the rotary shaft 7 is
And extends toward the center of the end plate of the revolving scroll 16. The upper end of the rotary shaft 7 is rotatably supported by an upper bearing 26 provided at a portion where the main frame 21 penetrates. An eccentric pin 27 protrudes from the upper end of the rotating shaft 7. The eccentric pin 27 is slidably fitted in the slide hole 25a. Thus, when the rotating shaft 7 rotates, the turning scroll 16 turns around the axis of the fixed scroll 11 and the end plate 17 of the turning scroll 16 and the main frame 2.
A rotation-preventing mechanism, such as an Oldham ring 28, is provided between the first receiving surface 21a and the rotation surface 16 to allow the orbiting scroll 16 to revolve, but to prevent the orbiting scroll 16 from rotating.

The Oldham ring 28 and the eccentric pin 2
Due to the revolving orbiting motion of the revolving scroll 16 obtained by 7, the volume of the closed space 20 is gradually reduced. That is, the gas can be compressed using the closed space 20.

On the upper surface of the end plate 12 of the fixed scroll 11, two large and small cylindrical flanges 31, 32 centering on the axis of the end plate 12 project upward. Further, flanges 31 and 3 are provided on the inner surface of the discharge cover-2.
A cylindrical flange 34 protruding into an annular concave portion 33 formed between the two is formed. The flange 34 is slidably fitted in the recess 33. U seals 35 are interposed between the side surfaces where the respective flanges 34 and the respective flanges 31 and 32 are in sliding contact with each other, thereby sealing the same portions.

As a result, the high-pressure chamber 3 is located in the central region partitioned by the inner U-seal 35, that is, the central portion of the upper surface of the end plate 12 covered by the central portion of the discharge cover 2.
An intermediate pressure chamber 37 is formed in an intermediate area partitioned by a U-seal 35 on the outer peripheral side of the end plate 12, which is covered with an intermediate part of the discharge cover-2. Is formed. Further, a low-pressure chamber having the same pressure as the suction pressure using the space 29 is formed on the outer peripheral side.

The high-pressure chamber 3 which is arranged concentrically with these end plates 12
6. The intermediate pressure chamber 37 and the high pressure chamber 36 among the low pressure chambers communicate with the discharge port 15. The intermediate pressure chamber 37 is
It communicates with the closed space 20 in the middle of compression through a pressure guide hole 38 provided in the end plate 12. The fixed scroll 11 floating upward is pressed against the revolving scroll 16 in the axial direction by the high-pressure and intermediate-pressure gas introduced into the high-pressure chamber 36 and the intermediate-pressure chamber 37. Has become.

In the turning scroll 16, a ring-shaped wear-resistant plate 40 is buried in a peripheral edge portion of the fixed scroll 11 which is in sliding contact with the shaft end surface of the peripheral wall 14. The wear-resistant plate 40 suppresses wear caused by a force for reversing the turning scroll 16 generated during operation.

In the discharge port 15, a check valve 42 for preventing backflow is provided. The discharge port 15 is in communication with a cylindrical discharge chamber 43 formed by a closed space constituting the high pressure side 3. This discharge chamber 43 is
The discharge pipe 44 connected to the upper wall of the sealed housing 1 is communicated with the discharge pipe 44 so that the discharge gas discharged into the discharge chamber 43 can be discharged to the outside of the closed housing 1.

The discharge pipe 44, the acoustic mode as shown in FIG. 3 - so that the knuckles X ₁ de A, set at a position shifted from the center of the discharge chamber -43 as shown in FIG. 2 is there. Set dimensioned to respect node portions Y ₁ de B, open end facing the discharge chamber -43 is arranged - with and the insertion depth of the discharge pipe 44, the acoustic mode as shown in FIG. 4 And connected. Specifically, the discharge chamber 43
R, the height dimension of the discharge pipe 44 is H, the radial dimension from the center of the discharge chamber 43 at the opening end facing the discharge chamber 43 of the discharge pipe 44 is r, and the discharge chamber 43 of the discharge pipe 44 is When the insertion dimension of the open end facing the inside into the discharge chamber-43 is h, "r / R = 2/3", "h / H
The discharge pipe 44 is connected to the discharge chamber 43 so that the relation of “= １ ／” is established.

However, in FIGS. 3 and 4, X ₂ ,
X ₃ is an acoustic mode - abdominal de A, Y _2, Y ₃ is an acoustic mode - de B
The abdomen of each is shown. On the other hand, the lower end of the rotating shaft 7 extends to the inner bottom side of the closed housing 1. The lower end is rotatably supported by a lower bearing body 45 installed below the low-pressure side 4.

At the lower end of the rotary shaft 7, for example, an oil pump adopting a pumping mechanism for generating a pump action by rotating an eccentric shaft 46 and swinging a swivel ring 48 accommodated in a cylinder 47 is provided. 49 are installed.

A suction part (not shown) of the oil pump 49
Is an oil reservoir 5 formed at the inner bottom of the closed housing 1.
Oil 51a that is in communication with the reservoir 1 and is stored in the reservoir 51;
It is designed to inhale. The discharge part of the oil pump 49 is
The oil passage 50 formed in the rotary shaft 7 communicates with each sliding portion of the compressor section 6 so that the oil 51a in the oil collecting section 51 can be pressure-fed to a location where lubrication is required.

The discharge portion of the oil pump 49 is provided with a relief valve 49a for returning the oil 51a to the oil collecting portion 51 when the pressure exceeds a predetermined pressure. Reference numeral 52 denotes a terminal cover for covering the terminal 10 exposed outside the sealed housing 1.

Next, the operation of the scroll type compressor constructed as described above will be described. Through terminal 10,
When the motor 5 is excited, the rotor 9 rotates. This rotation is transmitted to the oil pump 49 through the rotation shaft 7.

Then, the eccentric pin 46 of the oil pump 49 is eccentrically rotated, and the swing ring 40 is oscillated. Thus, the oil 51 a in the oil collecting part 51 is sucked from the suction part of the oil pump 49 and is discharged from the discharge part of the oil pump 49. Then, the discharged oil 51a is sent through the oil passage 50 to each part requiring the oil 51a, such as the sliding part of the compressor unit 6, under pressure.

On the other hand, the rotation of the motor 5 is performed through the rotating shaft 7, the eccentric pin 27, and the boss portion 19 to rotate the rotating scroll.
To the computer 16. Here, the turning scroll 16
Since the rotation is suppressed by the Oldham ring 28, the entire turning scroll does not rotate, but revolves around a circular orbit having a revolving radius of revolution centered on the axis of the fixed scroll 11.

In accordance with the revolving motion, the closed space 20 formed between the fixed scroll 11 and the revolving scroll 16 changes in a direction in which the volume decreases. Then, the suction gas passes through the suction pipe 30, the low pressure side 4, the suction passage, and the suction port (all not shown) in order, and is led to the outermost peripheral regions of the wraps 13 and 18, and from the region, the sealed space. It is sucked into 20.

The sucked gas is supplied to the revolving scroll 1
As the volume of the closed space 20 decreases in accordance with the orbital turning motion of No. 6, it gradually reaches the center while being compressed.

At this time, the fixed scroll 11 is
6 is pressed against the swirling scroll 16 by the discharge pressure guided to 6 and the intermediate pressure guided to the intermediate pressure chamber 37.
The compression process that proceeds in the closed space 20 is performed while gas leakage is suppressed.

Then, the gas compressed in a predetermined manner from the discharge port 15 passes through the check valve 42 to the discharge chamber 43
Is discharged. Here, the discharge pipe 44 connected to the discharge chamber 43 is shifted from the center of the discharge chamber 43 with respect to the acoustic mode A as shown in FIGS. In this way, the opening end is set to the same acoustic mode A.
Knuckles X ₁ of that is disposed at the corresponding position. At the same time, as shown in FIGS. 4A and 4B, the discharge pipe 44 is inserted into the discharge chamber 43 with respect to the acoustic mode B, so that the opening end of the discharge pipe 44 is the same as the acoustic mode. Node Y of de B
It is arranged at the position corresponding to ₁ .

Each of the nodes X ₁ , X ₁ ,
The setting of the discharge pipe 44 for Y _1, the discharge chamber -
The resonance of the pulsation of the discharge gas at 43 is suppressed.

Thus, the problem of the pulsation of the discharge gas caused by the acoustic modes A and B existing in the discharge chamber 43 is improved. The discharge gas with reduced pulsation is discharged from the discharge pipe 44 to the outside of the closed housing 1.

Therefore, the pulsation of the discharge gas transmitted to the discharge pipe 44 can be reduced, and a large pulsation noise is generated from a refrigeration cycle device (for example, an outdoor heat exchanger in an air conditioner) connected to the scroll compressor. Can be ameliorated.

In particular, as described above, the discharge pipe 44 is
When connected to the discharge chamber 43 so that the relationship of “r / R = ２” and “h / H = １ ／” is established, the pulsation of the cylindrical discharge chamber 43 is most effectively achieved. A reduction effect appears.

According to the experiment, the pulsation of the discharged gas was 1.6 to 1.6.
The 3.1 kHz band was significantly reduced.
Although the present invention has been applied to a scroll compressor as a hermetic compressor, the present invention is not limited to this, and may be applied to other rotary compressors and the like.

[0048]

As described above, according to the first aspect of the invention, it is possible to suppress the resonance of the pulsation of the discharge gas due to each acoustic mode existing in the discharge chamber. Therefore, it is most effective in a cylindrical discharge chamber.
Pulsation can be reduced .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a scroll type compressor which is a hermetic type compressor according to one embodiment of the present invention.

FIG. 2 is a plan view for explaining a connection position of a discharge pipe as viewed in a direction indicated by an arrow in FIG.

FIG. 3A is a schematic cross-sectional view of a discharge chamber for explaining that an opening end of a discharge pipe is arranged with respect to a node of an acoustic mode A; (B) is a plan view of the discharge chamber.

FIG. 4A is a schematic cross-sectional view of a discharge chamber for explaining that an opening end of a discharge pipe is disposed at a node of an acoustic mode B; (B) is a sectional view for explaining acoustic mode B.

FIG. 5A is a cross-sectional view for explaining connection of a discharge pipe to a discharge chamber formed in a conventional hermetic compressor. (B) is a top view similarly.

FIG. 6A is a schematic cross-sectional view of a discharge chamber for explaining an acoustic mode existing in the discharge chamber of the hermetic compressor. (B) is a plan view of the discharge chamber.

FIG. 7A is a schematic cross-sectional view of a discharge chamber for explaining an acoustic mode existing in the discharge chamber of the different hermetic compressor. (B) is a sectional view for explaining the acoustic mode.

[Explanation of symbols]

1 ... enclosed housing 5 ... motor - motor 6 ... compressor unit (compression mechanism) 15 ... discharge port - DOO 43 ... discharge chamber - 44 ... discharge tube X ₁ ... acoustic mode - knuckles of de Y ₁ ... acoustic mode - de Knot of

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuhiro Sato 1 Nagoya Laboratory, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Mitsubishi Heavy Industries, Ltd. Nagoya Laboratory JP-A-55-14982 (JP, A) JP-A-2-196189 (JP, A) JP-A-1-285691 (JP, A) JP-A-3-107594 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F04C 23/00-29/10 331 F04B 39/00 101

Claims (1)

(57) [Claims] 1. A closed housing accommodates a compression mechanism and a motor for driving the compression mechanism, and a cylindrical discharge chamber for receiving discharge gas compressed by the compression mechanism is formed at an upper portion of the housing. And a discharge chamber connected to a discharge pipe for discharging discharge gas from the discharge chamber to the outside of the closed housing, wherein an end of the discharge pipe connected to the discharge chamber has a radius of the discharge chamber. R, the height dimension H, the radial dimension from the center of the discharge chamber at the open end facing the discharge chamber of the discharge pipe into the discharge chamber at the open end facing the discharge chamber of the discharge pipe. A sealed compressor characterized in that r / R = ２ and h / H = １ ／, where h is the insertion dimension of h.