JPH07103173A - Enclosed compressor - Google Patents

Abstract

PURPOSE:To provide an enclosed compressor that is simple and inexpensive in structure, making efficient use of a discharge car, and able to damp the pulsation of discharged gas to the full. CONSTITUTION:This compressor is featured that a baffle plate 41, partitioning off a discharge chamber 43 into an inner circumferential side chamber and an outer circumferential side chamber to be interconnected to a discharge port 15 of a compression mechanism 6, is installed in this chamber 43 of an enclosed housing 1, while a through hole 43c interconnecting both these chamber is installed in this baffle plate 41, and a discharge pipe 44 is connected to a position where a distance from the through hole comes to an equation (long stroke- short stroke=120m (sound speed)/2X operating frequency, in the outer circumferential side chamber. With this constitution, at the outer circumferential side chamber, the discharged gas is divided into two routes, one is from the through hole 43c to the discharge pipe 44 by way of the long stroke, and the other from the hole 43c to the discharge pipe 44 by way of the short route at the opposite side, whereby any pulsation is negated to each other at a part of the discharge pipe 44, and thus the pulsation of the discharged gas is damped to the full.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor which discharges gas compressed by a compression mechanism from a discharge pipe to the outside of a hermetically sealed housing through a discharge chamber inside the hermetically sealed housing.

[0002]

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

Both of these are connected via a drive shaft, and the rotational force of the motor is transmitted to the compression mechanism to drive the compression mechanism. By the way, in the hermetic compressor, in order to reduce the pulsation of the discharge gas generated in the compression mechanism, as shown in FIG.
A discharge chamber connected to the center of the discharge chamber-b after forming a discharge chamber-b having a cylindrical shape inside the discharge chamber-b and discharging discharge gas from the compression mechanism c into the discharge chamber-b. It is designed to be discharged to the outside via d.

[0004]

However, since the discharge chamber-b has a structure in which the space is used as it is, the function of attenuating the pulsation of the discharge gas is limited. Therefore, there is a problem that the pulsation of the discharge gas cannot be completely attenuated in the discharge chamber-b and propagates to the discharge pipe.

Since this pulsation propagates through the pipe from the discharge pipe, a large pulsating noise is emitted from a refrigeration cycle device (for example, an outdoor heat exchanger in an air conditioner) connected to a hermetic compressor. Becomes

Therefore, it is possible to separately install a discharge muffler. However, this has a problem that the cost is considerably high, and the pulsation cannot be easily reduced.

Therefore, in the hermetic compressor, there is a demand for a compressor that can reduce pulsation effectively and with a simple structure. The present invention has been made by paying attention to such a situation, and an object thereof is a simple structure and a low cost, by effectively utilizing a discharge chamber, to sufficiently pulsate a discharge gas. An object of the present invention is to provide a hermetic compressor that can be attenuated.

[0008]

In order to achieve the above object, the hermetic compressor of the present invention has a discharge chamber formed in a hermetic housing and a discharge port of a compression mechanism. A partition plate for partitioning the inner peripheral chamber and the outer chamber communicating with the outer peripheral chamber is provided, and the partition plate is provided with a through hole communicating the inner peripheral chamber and the outer chamber, and the outer chamber. In the figure, the discharge pipe is connected at a position where the distance from the through hole is “long stroke−short stroke = 120 m (sonic velocity) / 2 × operating frequency”.

[0009]

According to the hermetically sealed air compressor of the present invention, the discharge gas discharged from the discharge port of the compression mechanism is stored in the chamber on the inner peripheral side.
Through the through hole to the outer peripheral chamber. This discharge gas has a path from the through hole to the discharge pipe through a long stroke,
It is divided into a path to the discharge pipe through a short stroke on the opposite side and then collides at the position of the discharge pipe.

At this time, the position of the discharge pipe is set to "long stroke-short stroke = 120 m (sonic velocity) / 2 * operating frequency". This means that the discharged gas that has passed through each path has pulsations that cancel each other at the position of the discharge pipe.

However, the pulsation of the discharge gas is sufficiently attenuated by effectively utilizing the discharge chamber.
Moreover, this damping effect is simple and low in cost because the partition plate having the through hole is provided in the discharge chamber and the discharge pipe is connected to the set position.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. FIG. 1 shows a hermetic compressor to which the present invention is applied, for example, a scroll compressor.
Is a closed housing.

The closed housing 1 is formed in a cylindrical shape extending in the vertical direction. On the upper side of the closed housing 1, a discharge cover-2 is provided so as to partition in the vertical direction.

With this discharge cover-2 as a boundary,
In the closed housing 1, the upper side of the closed housing 1 is the high-pressure side 3 and the lower side is the low-pressure side 4. On the low pressure side 4 of the closed housing 1, a motor 5 is arranged on the lower side and a scroll type compression mechanism 6 is arranged on the upper side. In addition, a rotary shaft 7 (rotary shaft) is arranged between the both.

The motor 5 has a stator 8 press-fitted into and supported by the inner peripheral portion of the hermetically sealed housing 1, and a rotor 9 arranged in the inner cavity of the stator 8. There is. The rotor 9 is fixed to the lower side of the rotary shaft 7 so that the rotation is output from the rotary shaft 7. The terminal 10 connected to the stator 8 is installed on the outer peripheral portion of the closed housing 1.

The scroll type compression mechanism 6 has a fixed scroll 11 made of aluminum, which is made of, for example, an aluminum member, and a swivel scroll 16 also made of aluminum, which is combined with the fixed scroll 11.

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

The orbiting scroll 16 has an end plate 17 and a spiral wrap 18 standing on the inner surface thereof. In addition, a cylindrical boss portion 19 is provided at the center of the outer surface of the end plate 17. Then, the fixed scroll 11 and the turning scroll 16
It means that the laps 13 and 18 are combined so as to be meshed with each other by shifting by 180 degrees (predetermined angle), and a plurality of crescent moons are formed between the wraps surrounded by the end plates to establish the compression process. Each closed space 20 is configured.

The combined scrolls 11 and 16 are
Between the discharge cover-2 and the casing-shaped main frame 21 fixed to the upper side of the low pressure side 4, the fixed scroll 11 is on the upper side and the swivel scroll 16 is on the lower side. It is inserted in the installed state.

Then, the end plate 12 of the turning scroll 16
Is a horizontal receiving surface 2 formed on the upper surface of the main frame 21.
It is slidably received by 1a. Fixed scroll
The rule 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. Specifically, the fixed scroll 11 is provided with a bracket 23 protruding laterally of the peripheral wall portion 21b. And this bracket 23
Is fixed to the upper portion of the peripheral wall portion 21 via a support spring 22.

The suction port (not shown) provided on the peripheral wall 14 of the fixed scroll 11 is a space 2 on the side of the peripheral wall 14.
9, a suction passage (not shown) provided on the main frame 21 for communicating both sides of the same frame 21, a low pressure side 4, and a suction pipe 30 connected to the outer peripheral portion of the hermetic housing 1. The gas can be guided to the compression mechanism 6 from the outside.

A drive bush 25 is fitted into the boss portion 19 of the orbiting scroll 16 via a orbiting bearing 24. The drive bush 25 is formed with a slide hole 25a that is a through hole that extends slightly in the radial direction.

The upper end of the rotary shaft 7 has a main frame 21.
And extends toward the center of the end plate of the turning scroll 16. The upper end of the rotary shaft 7 is rotatably supported by an upper bearing 26 provided in the penetrating portion of the main frame 21.

An eccentric pin 27 is projectingly provided on the upper end of the rotary shaft 7. The eccentric pin 27 is slidably fitted in the slide hole 25a. As a result, the turning scroll 16 turns about the axis of the fixed scroll 11 when the rotary shaft 7 rotates, and the end plate 17 of the turning scroll 16 and the receiving surface of the main frame 21. A rotation preventing mechanism, such as an Oldham ring 28, which allows the revolving motion of the revolving scroll 16 but prevents the revolving revolving scroll 16 from rotating, is interposed between the revolving scroll 21 and 21a.

The Oldham ring 28 and the eccentric pin 2
The volume of the enclosed space 20 is gradually reduced by the orbiting revolution movement of the orbiting scroll 16 obtained by 7. That is, the gas can be compressed by 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 and 32 centering on the axis of the end plate 12 are projected upward. Further, on the inner surface of the discharge cover-2, the flanges 31, 3 are provided.
A cylindrical flange 34 is formed to project into an annular recess 33 formed between the two. The flange 34 is slidably fitted in the recess 33. U-seals 35 are respectively interposed between the side surfaces of the flanges 34 and the flanges 31 and 32 in sliding contact with each other to seal the same portions.

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

A high-pressure chamber 3 concentrically arranged with the end plates 12
6, the intermediate pressure chamber 37 and the high pressure chamber 36 of the low pressure chamber communicate with the discharge port 15. Further, the intermediate pressure chamber 37 is
Through the pressure guiding hole 38 provided in the end plate 12, it communicates with the closed space 20 which is being compressed. The fixed scroll 11 floating upward is axially pressed against the swivel scroll 16 by the high pressure and intermediate pressure gases introduced into the high pressure chamber 36 and the intermediate pressure chamber 37. Has become.

In the turning scroll 16, a wear-resistant plate 40 formed in a ring shape is embedded 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 abrasion resistant plate 40 suppresses abrasion caused by the force that tends to reverse the turning scroll 16 generated during operation.

A check valve 42 for preventing backflow is provided in the discharge port 15. The discharge port 15 communicates with a cylindrical discharge chamber 43 formed in a closed space which constitutes the high pressure side 3.

On the outer peripheral side of the discharge chamber 43,
As shown in FIG. 2, a cylindrical baffle plate 41 (corresponding to a partition plate) is provided so as to partition the inside of the discharge chamber 43 into an inner peripheral side and an outer peripheral side.

The baffle plate 41 allows the inside of the discharge chamber 43 to communicate with the discharge port 15 inside, and has a circular inner peripheral side chamber 43a and an outer circular outer peripheral side chamber 43b. It is divided into

A through hole 43c is formed in the plate surface of the baffle plate 41, and the chamber 43 on the inner peripheral side is provided through the through hole 43c.
a is communicated with the outer chamber 43b. As a result, the gas discharged from the inner chamber 43a is divided into two flows, which flow from the hole 43c to the left and right in the outer chamber 43b.

The outer peripheral chamber 43b is a discharge pipe 44 connected to the upper wall portion of the closed housing 1 which is the upper wall thereof.
The discharge gas reaching the outer peripheral chamber-43b can be discharged to the outside of the closed housing 1.

Further, the discharge pipe 44 is connected to a position where the pulsations of the discharge gas flowing from the through hole 43c to the left and right cancel each other out due to collision. Specifically, the connection position of the discharge pipe 44 is such that when one path from the through hole 43c to the discharge tube 44 is "long stroke" and the other path is "short stroke", "long stroke-short stroke = 120 m ( The position is set to satisfy the relationship of "Sound velocity) / 2 x operating frequency".

Here, the above-mentioned formula requires such a position that the pulsations of the discharge gas that flow from the through hole 43a to the left and right of the outer peripheral chamber 43b collide and cancel each other during the operation of the compressor.

The discharge pipe 44 is connected to this position. In other words, after the discharge gas reaches the discharge pipe 44, the pulsation is attenuated by canceling each other out,
The liquid is discharged to the outside of the closed housing 1.

On the other hand, the lower end of the rotary shaft 7 extends to the inner bottom side of the closed housing 1. The lower end portion is rotatably supported by the lower bearing body 45 installed on the lower side of the low pressure side 4.

At the lower end of the rotary shaft 7, for example, an eccentric shaft 46 is rotated to swing a swivel ring 48 housed in a cylinder 47 so as to generate a pumping action. 49 are installed.

Suction portion of this oil pump 49 (not shown)
Is an oil collecting portion 5 formed at the inner bottom of the closed housing 1.
Oil 51a which is in communication with 1 and is accumulated in the collecting portion 51
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 compression mechanism 6 so that the oil 51a in the oil collecting portion 51 can be pressure-fed to a portion requiring lubrication.

Further, the discharge part of the oil pump 49 is provided with a relief valve 49a for returning the oil 51a to the oil collecting part 51 when a predetermined pressure is exceeded. Reference numeral 52 is a terminal cover for covering the terminal 10 exposed outside the closed housing 1.

Next, the operation of the scroll type compressor thus constructed 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 rotary shaft 7.

Then, the eccentric pin 46 of the oil pump 49 is eccentrically rotated, and the turning ring 40 is swung. As a result, the oil 51 a in the oil collecting portion 51 is sucked from the suction portion of the oil pump 49 and discharged from the discharge portion of the oil pump 49. Then, the discharged oil 51a is pressure-fed to each portion requiring the oil 51a such as the sliding portion of the compression mechanism 6 through the oil passage 50.

On the other hand, the rotation of the motor 5 is performed by the rotary shaft 7, the eccentric pin 27, and the boss portion 19 for the rotation scroll.
It is transmitted to Le 16. Here, the turning scroll 16
Since the Oldham ring 28 suppresses the rotation, the entire turning scroll does not rotate, but makes a revolving revolving motion on a circular orbit having a revolving revolving radius which is the center of the axis of the fixed scroll 11.

In accordance with this revolution revolving movement, the enclosed space 20 formed between the fixed scroll 11 and the revolving scroll 16 changes in the direction of decreasing volume. Then, the suction gas passes through the suction pipe 30, the low-pressure side 4, the suction passage, and the suction port (none of which is shown) in this order, and is guided to the outermost peripheral region of the wraps 13 and 18, and from the same region, the sealed space 20 is sucked into.

The sucked gas is swirl scroll 1
As the volume of the closed space 20 decreases in accordance with the revolution revolving motion of 6, the compressed space reaches the central portion while being gradually compressed.

At this time, the fixed scroll 11 is attached to the high pressure chamber 3
6 is pressed against the swirl 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 suppressing gas leakage.

Then, the gas compressed in a predetermined manner from the discharge port 15 passes through the check valve 42, and then is discharged into the discharge chamber 43.
Is discharged to the inner circumferential chamber-43a. The discharge gas attenuated in the inner peripheral chamber-43a passes through the through hole 4
3c is divided into two flows, that is, a path from the 3c to the discharge pipe 44 through the "long stroke" and a path to the discharge pipe 44 through the "short stroke" on the opposite side, and flows through the outer chamber 43b. .

Then, the two discharge gas streams flowing through the outer peripheral chamber-43b collide with each other at the discharge pipe position and join together. At this time, the position of the discharge pipe 44 is a position where the pulsation of the discharge gas from the “long stroke” and the pulsation of the discharge gas from the “short stroke” collide with each other during the operation of the compressor and cancel each other, that is, "Long stroke-short stroke = 120 m (sound velocity) /
It is in a position that can be obtained by "2 x operating frequency".

This means that by the time the gas is discharged from the discharge pipe 44, the pulsation of the discharge gas is attenuated by the two divided discharge gas flows canceling each other. That is,
The discharge chamber-43 is effectively used, and it is sufficiently attenuated.

The discharge gas merges at the inlet of the discharge pipe 44 and is discharged from the discharge pipe 44 to the outside of the closed housing 1. Therefore, the pulsation of the discharge gas propagating to the discharge pipe 44 can be reduced, and a large pulsating sound is emitted from the refrigeration cycle device (for example, the outdoor heat exchanger in the air conditioner) connected to the scroll compressor. It is possible to improve the inconveniences such as

In addition, the effect of this damping is that the baffle plate 41 having the through hole 43c is provided in the discharge chamber 43 to partition the inside of the discharge chamber 43, and the position of the outer chamber 43b determined by the formula. In addition, since the discharge pipe 44 is simply connected, the structure is simple and the cost is low.

Although the present invention has been applied to a scroll type compressor as a hermetic type compressor, the present invention is not limited to this and other roll type compressors may be used.
It may be applied to a hermetic compressor having a discharge chamber in a hermetic housing such as a ring piston type.

[0054]

As described above, according to the present invention, the discharge gases divided into two parts cancel each other out,
The pulsation of the discharge gas can be sufficiently attenuated by utilizing the discharge chamber.

Therefore, the pulsation of the discharge gas propagated to the discharge pipe can be reduced, and a low pulsation hermetic compressor can be provided. As a result, it is possible to improve the inconvenience that a large pulsating sound is emitted from the refrigeration cycle device connected to the hermetic compressor.

In addition, for the damping of pulsation, a partition plate having a through hole is provided in the discharge chamber to partition the inside of the discharge chamber, and the discharge pipe is connected to the position of the outer peripheral chamber determined by the given formula. It is structurally simple and it is low cost.

[Brief description of drawings]

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

FIG. 2 is a plan sectional view taken along the line AA in FIG.

FIG. 3A is a cross-sectional view for explaining attenuation of pulsation of discharge gas using a discharge chamber of a conventional hermetic compressor. (B) is a plan view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Airtight housing 5 ... Motor 6 ... Compression mechanism 15 ... Discharge port 41 ... Baffle plate (partition plate) 43 ... Discharge chamber-43a ... Inner circumference side chamber-43b ... Outer circumference side chamber-43c ... Through hole 44 … Discharge pipe

Claims (1)

[Claims] 1. A hermetically sealed housing for accommodating a compression mechanism and a motor for driving the compression mechanism, and a discharge chamber for receiving compressed gas discharged from a discharge port of the compression mechanism in the housing. A hermetic compressor, which is formed and has a discharge pipe connected to the discharge chamber for discharging the gas of the discharge chamber to the outside of the hermetically sealed housing, wherein the inside of the discharge chamber is discharged by the compression mechanism. A partition plate is provided for partitioning the inner chamber and the outer chamber that communicate with the port, and the partition plate has a through hole that communicates between the inner chamber and the outer chamber, and In the outer chamber, the discharge pipe is connected at a position where the distance from the through hole is long stroke-short stroke = 120 m (sonic velocity) / 2 × operating frequency. Type compressor.