JP3028642B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed and movable scroll disposed under a high-pressure dome-shaped hermetic casing for releasing high-pressure fluid, and a refrigerant in a fluid working chamber defined between spiral bodies of the scrolls. The present invention relates to a scroll type fluid machine that performs compression or the like.

[0002]

2. Description of the Related Art Conventionally, a scroll type fluid machine of this type is disclosed in Japanese Patent Application Laid-Open No. 2-9987 and each spiral is provided at a lower portion of a high-pressure dome-shaped closed casing D as shown schematically in FIG. A fixed scroll A and a movable scroll B having bodies a and b are housed therein, and a motor M for connecting a crankshaft S is housed above the fixed scroll A and the movable scroll B. After the compressed high-pressure gas is compressed in a fluid working chamber C defined between a and b, and once discharged from a high-pressure fluid passage H opened at the center of the fixed scroll A to a chamber T on the back side, the compressed gas is bypassed. Tube U
Through a discharge pipe P to the outside of the casing D, and an oil sump O is provided at a lower part of the motor M, and the oil sump O is used to carry out a bearing portion of the crankshaft S and the like. Oil is supplied to the sliding parts of the scrolls A and B.

[0003]

However, in the prior art described above, the high-pressure fluid passage H is provided at the center of the spiral of the fixed scroll A, and the high-pressure gas is opened to the chamber T on the back side of the fixed scroll A. Therefore, the entire back surface of the fixed scroll A is urged by the high pressure, and the urging force on the back surface is counteracted from the fluid working chamber C side where a pressure gradient is sequentially formed from the low pressure region at the outer periphery of the spiral to the high pressure region at the center. The force inside the fluid working chamber C is heated by the high-pressure and high-temperature gas on the back surface of the fixed scroll A, and the volume efficiency is deteriorated. There is a problem that causes.

Further, since the chamber T provided on the back side of the fixed scroll A is in a high pressure area, a high pressure oil reservoir O is provided in a fluid working chamber C in an intermediate pressure area in order to seal between the spiral bodies a and b. Since the passage for injecting oil from the inside cannot be passed through the inside of the chamber T, there is also a problem that the configuration of the passage for oil injection becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll type fluid machine which can reduce the deflection of a fixed scroll, improve the performance thereof, and can simplify the structure of a passage for injecting oil into a fluid working chamber. .

[0006]

In order to achieve the above object, the present invention provides a high-pressure dome-shaped closed casing.
A scroll type fluid machine in which a fixed scroll 2 and a movable scroll 3 are provided in a lower portion of the scroll and a motor 9 is provided in an upper portion thereof and a fluid working chamber 4 is defined between the scrolls of the scrolls 2 and 3. The movable scroll 3 is provided with a high-pressure fluid passage 34 communicating with the inside of the casing 1, and the chamber 7 that is partitioned from the inside of the casing 1 is provided between the back surface of the fixed scroll 2 and the bottom 13 of the casing 1. The chamber 7 and an oil reservoir provided inside the casing 1 communicate with each other through an oil passage 6 having a throttle, while the bottom of the chamber 7 and the fluid working chamber 4 in an intermediate pressure region are provided. And oil communication path 70.

[0007]

[Function] Chamber 7 provided on the back of fixed scroll 2
Is connected to a high-pressure oil reservoir provided inside the closed casing 1 through an oil passage 6 having a throttle portion, and is connected to a fluid working chamber 4 in an intermediate pressure region through an oil injection passage 70. The internal pressure of the chamber 7 is maintained at an intermediate pressure close to the pressure in the fluid working chamber 4, which is a pressure reduced by an amount corresponding to the narrowing of the passage in the oil passage 6 with respect to the high pressure. Oil is introduced into the chamber 7 from the oil reservoir via the oil passage 6, and is injected into the fluid working chamber 4 from the bottom of the chamber 7 via the oil injection path 70. In this case, since the rear side of the fixed scroll 2 is in the intermediate pressure region, the urging force from the rear side of the fixed scroll 2 can be prevented from being excessive, and the deformation of the fixed scroll 2 can be reduced. In addition, the heating of the working fluid in the fluid working chamber 4 can be suppressed, and
The oil can be injected into the fluid working chamber 4 by using the bottom of the fluid passage, so that the configuration of the passage can be simplified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll type fluid machine shown in FIG.
A fixed scroll 2 in which a spiral plate 22 and an outer peripheral wall 23 connected to the spiral plate 22 are projected from a lower end of a high-pressure dome-shaped closed casing 1 having a top 1, a top 12 and a bottom 13.
And a movable scroll 3 having a spiral plate 32 protruding from an end plate 31
And a motor 9 having a rotor 91 and a stator 92 on the upper side.

An eccentric hole 94 is provided at a lower portion of the crankshaft 93 connected to the rotor 91.
A boss 33 protruding from the back surface of the movable scroll 3 is fitted, and an Oldham ring 30 for preventing the movable scroll 3 from rotating is interposed between the movable scroll 3 and the housing 8. The scroll 3 is revolved and the low-pressure gas taken in from the suction pipe 14 is swirled by the spiral bodies 22 and 3.
The fluid is compressed in a fluid working chamber 4 defined between the two.

With the above arrangement, the movable scroll 3
A high-pressure fluid passage 34 extending in the axial direction of the boss portion 33 and opening the high-pressure gas after being compressed in the fluid working chamber 4 to the inside of the casing 1 is provided. Is communicated with the inside of the casing 1 through the communication passage 95. A seal ring 35 is interposed at the connection between the high-pressure fluid passage 34 and the communication passage 95, and the high-pressure gas released into the closed casing 1 is supplied to the air gap of the motor 4 or the like. Through the upper discharge pipe 15 to the outside.

A chamber 7 is provided between the rear surface of the end plate 21 of the fixed scroll 2 and the bottom 13 of the casing 1 so as to partition the inside of the casing 1. An annular oil reservoir 97 is provided by a partition member 96, which is separated from a rotation area of the crankshaft 93. A bearing gap of the main bearing 5 supporting the crankshaft 93 in the middle between the chamber 7 and the oil reservoir 97 is provided. Are communicated via an oil passage 6 having a throttle portion utilizing the above.

The oil passage 6 includes a first passage 61 that communicates with the main bearing 5 through a high-pressure side working chamber 81 that defines the bottom of the oil reservoir 97 at the center of the back surface of the orbiting scroll 3, and the main bearing 5. And a second passage 62 that communicates the oil outflow side to the chamber 7, and the main bearing 5 is interposed in the middle part to perform a predetermined pressure reduction. In order to prevent the passage from being extremely narrowed by the main bearing 5 and the amount of oil flowing out to the second passage 62 side from being extremely reduced, an oil groove extending in the axial direction over a predetermined length on the inner surface of the main bearing 5. 51, and a horizontal hole 5 is formed in the oil groove 51.
2, the inlet of the second passage 62 is connected. or,
After the oil has been supplied to the fitting portion between the boss portion 33 and the eccentric hole 94, the oil groove 5 is provided through an oil hole 98 provided obliquely on the crankshaft 93.
I try to collect them in one.

In the outer peripheral portion of the back surface of the movable scroll 3 which is partitioned from the high-pressure side working chamber 81, there are provided low-pressure side working chambers 82 in a low-pressure region communicating with the spiral outer peripheral side. A seal ring 80 interposed between an annular groove 83 provided in the housing 8 and the low pressure side working chamber 82.
Is shut off by

An oil injection passage is formed between the bottom of the chamber 7 and the fluid working chamber 4 in the intermediate pressure region, through a pair of pickup pipes 71, 71 and through holes 72, 72 opened in the fixed scroll 2. It communicates via 70, 70.

With the above configuration, the chamber 7 provided on the back surface of the fixed scroll 2 is communicated with the high-pressure oil reservoir 97 provided inside the closed casing 1 via the oil passage 6 having a throttle portion formed by the main bearing 5. The oil pressure passage 70 communicates with the fluid working chamber 4 in the intermediate pressure region through an oil injection passage 70, and the internal pressure of the chamber 7 is reduced by the main main bearing 5 interposed in the oil passage 6 with respect to the high pressure. Is maintained at an intermediate pressure close to the pressure in the fluid working chamber 4, and is introduced into the chamber 7 from the high-pressure oil reservoir 97 via the oil passage 6, and oil is injected from the bottom of the chamber 7. Oil is injected into the fluid working chamber 4 through the passage 70. In this case, since the rear side of the fixed scroll 2 is in the intermediate pressure region, the urging force from the rear side of the fixed scroll 2 can be prevented from being excessive, and the deformation of the fixed scroll 2 can be reduced. At the same time, heating of the working fluid in the fluid working chamber 4 can be suppressed, and oil can be injected into the fluid working chamber 4 using the bottom of the chamber 7.
The structure of the passage can be simplified.

In the above-described embodiment, the throttle portion provided in the oil passage 6 is formed by using the bearing gap of the main bearing 5, but in addition, the oil reservoir 97 and the chamber 7 are connected by an oil passage having a capillary tube. Alternatively, the throttle section may be formed by a capillary tube.

[0017]

As described above, according to the present invention, the rear side of the fixed scroll 2 is an intermediate pressure area, and the fixed scroll 2
Of the working fluid in the fluid working chamber 4 can be suppressed, and the performance can be improved. In addition, oil can be introduced into the fluid working chamber 4 by using the chamber 7 on the back side of the fixed scroll 2. Injection can be performed, and the configuration of the passage for oil injection can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll type fluid machine of the present invention.

FIG. 2 is a sectional view of a conventional scroll type fluid machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 2 Fixed scroll 3 Movable scroll 4 Fluid working chamber 6 Oil passage 7 Chamber 9 Motor 13 Bottom 34 High pressure fluid passage 70 Oil injection passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A fixed scroll 2 and a movable scroll 3 are provided in a lower part of a high-pressure dome-shaped closed casing 1, and a motor 9 is provided in an upper part thereof.
In a scroll type fluid machine in which a fluid working chamber 4 is defined between three spiral bodies, the movable scroll 3 is provided with a high-pressure fluid passage 34 communicating with the inside of the casing 1, and a back surface of the fixed scroll 2 and the A chamber 7 is provided between the bottom of the casing 1 and the interior of the casing 1 so as to partition the interior of the casing 1 from the oil reservoir provided inside the casing 1. And an oil injection passage 7 between the bottom of the chamber 7 and the fluid working chamber 4 in the intermediate pressure region.
A scroll-type fluid machine, wherein the scroll-type fluid machine communicates at zero.