JP3216176B2 - Scroll 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 scroll compressor.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor has been disclosed in
With the structure as shown in Japanese Patent No. 67379, the structure will be described below with reference to FIG.

As shown in FIG. 1, a compression mechanism 102 and a stator 103 of an electric motor are fixed inside a closed container 101, and an oil reservoir 104 for storing oil is provided at the bottom.

As described above, the stator 103 of the electric motor is integrally mounted in the closed casing 101, and
Reference numeral 05 is integrally attached to a rotating shaft 117 which is horizontally and rotatably supported at the center of the bearing part 106.

The compression mechanism 102 comprises a fixed scroll component 109 having a fixed scroll 108 integrally formed on a disk-shaped fixed head plate 107 and the fixed scroll 1.
The orbiting scroll 111 which meshes with the helical part 08 to form a plurality of compression spaces 110 is constituted by an orbiting scroll component 113 formed on a disc-shaped orbiting end plate 112 and the like.

[0006] The bearing component 106 is closely fixed to the fixed head plate 107 by a plurality of bolts (not shown). Discharge port 11 to discharge into
5 is drilled.

The orbiting head plate 112 is combined with the fixed end plate 107 so as to form the compression space 110 at a plurality of positions by integrally sliding the orbiting scroll 111 with the fixed scroll 108 at a plurality of positions. is there. A cylindrical fitting portion 116 is formed at the center of the back surface of the turning head plate 112, and the eccentric portion 117E of the rotary shaft 117 is rotatably fitted in the fitting portion 116. is there. Further, the back surface of the turning head plate 112 is provided with an annular portion 1 formed integrally with the bearing component 106.
18 is slidably supported on the end face. The annular part 1
A rotation restraining part 119 is provided outside the outer periphery of the motor 18.

[0008] The rotation restricting part 119 is provided with the fixed end plate 1.
07, the directionality of the revolving head plate 112 is always kept constant. The rotation restraining part 11
9 is provided with an oil pump mechanism 120 in the radial direction, and oil flow paths 121, 122, 123, 124, 125
Supply oil to the area where lubrication is required. The supplied oil is discharged into the closed container 101 through the oil flow paths 126 and 127, respectively.

The rotating shaft 117 is provided with a balance weight 128 for balancing the eccentric load applied to the rotating shaft 117.

[0010]

In such a conventional scroll compressor, an oil discharge port is provided at a rotating portion or at a position close to the rotating portion, so that the oil is scattered in a closed container, and the oil is sucked. The compressor is sucked into the compression chamber together with the gas and reduces the capacity of the compressor. Cause a decrease in reliability.

Further, since the balance weight provided on the rotating shaft rotates together with the rotating shaft, the scattering of the discharged oil is increased, and the oil in the oil sump is agitated especially in a horizontal compressor. In addition, oil in the sealed container may be scattered, and input of the compressor may be increased due to resistance due to agitation, and intermittent resistance due to agitation may cause current fluctuation (current fluctuation) of the compressor.

[0012]

A first technical means for solving the above-mentioned problems of the conventional scroll compressor is as follows: an electric motor, a compression mechanism driven by the electric motor, A fixed scroll component having a fixed scroll in which the compression mechanism is fixed or formed integrally with a fixed head plate, and a turning scroll that meshes with the fixed scroll to form a plurality of compression spaces. An orbiting scroll part fixed or formed on the top,
A rotation restricting component for restricting the rotation of the orbiting scroll component, a rotating shaft for eccentrically driving the orbiting scroll component, and a bearing component for supporting a main shaft formed at one end of the rotating shaft; An oil outlet for lubricating a portion of the compression mechanism that requires lubrication is provided in the mechanism, a cover is provided to cover the oil outlet, and oil is returned from the cover to the closed container. It is to provide a hole.

A second technical means for solving the problem is that, in addition to the first solution, an oil return hole for returning oil from the cover into the closed container is provided below the horizontal plane, and is horizontally arranged. That is.

A third technical means for solving the problem is that, in a horizontal scroll, an electric motor, a compression mechanism driven by the electric motor, and an oil sump at the bottom are arranged in a closed container. A fixed scroll component having a fixed scroll fixed or formed integrally with the fixed end plate; a orbiting scroll component meshed with the fixed scroll, and a orbiting scroll forming or forming a plurality of compression spaces fixed or formed on the orbiting end plate; A rotation restricting component for restricting rotation of the orbiting scroll component, a rotary shaft for eccentrically driving the orbiting scroll component, and a bearing component for supporting a main shaft formed at one end of the rotary shaft; And a cover for covering the balance weight.

A fourth technical means for solving the problem is that an electric motor, a compression mechanism driven by the electric motor, and an oil reservoir are arranged at the bottom inside the closed container, and the compression mechanism is integrated with a fixed end plate. A fixed scroll component having a fixed scroll fixed or formed on the orbiting scroll component meshing with the fixed scroll and forming orbiting scrolls forming a plurality of compression spaces on orbiting end plate;
A rotation restricting component for restricting rotation of the orbiting scroll component, a rotating shaft for eccentrically driving the orbiting scroll component, and a bearing component for supporting a main shaft formed at one end of the rotating shaft; A shaft is disposed on the bearing component so as to be inserted from the side opposite to the orbiting scroll component, and a balance weight is formed on the rotating shaft so as to be close to the bearing component, and the rotating shaft is Providing a cover that can be fitted in the same direction as the direction of insertion into the bearing component and that covers the balance weight portion, and that a projection provided on the inner surface side of the cover is engaged with a ring-shaped groove provided in the bearing component. In

[0016]

The operation of the first technical means of the present invention is as follows.
By providing a cover that covers the oil discharge port, it is possible to prevent the oil from scattering into the closed container.In addition, by providing an oil return hole from the cover to the closed container, the collected oil can be securely stored in the oil reservoir. It can be returned. The operation of the second technical means is as follows. In the horizontal scroll compressor, the oil accumulated in the cover can be reduced by providing an oil return hole from the cover into the closed container below the horizontal plane, and the collected oil can be recovered. It is possible to surely and quickly return to the oil sump.

The function of the third technical means is that, by providing a cover for covering the balance weight in the horizontal scroll compressor, stirring of the oil in the oil reservoir by the balance weight can be prevented.

The operation of the fourth technical means is to provide a projection on the inner surface of the cover for covering the balance weight and to engage the ring-shaped groove of the bearing component with the flow of gas or oil in the closed container by the balance weight. Can be prevented, and the cover can be stably fitted into the bearing parts.
That is, the cover can be prevented from coming off.

[0019]

FIG. 1, FIG. 2 and FIG.
Shown in As shown in the figure, a compression mechanism 2 and a stator 3 of an electric motor are fixed inside a closed container 1, and an oil reservoir 4 for storing oil is provided at the bottom thereof. The closed container 1 includes a closed container 1
A substantially disk-shaped bearing component 6 that divides the inside into a drive chamber 5A and a compression mechanism chamber 5B is integrally fixed, and the bearing chamber 6 communicates the drive chamber 5A and the compression mechanism chamber 5B. A communication hole 7 is provided. Further, a discharge pipe 8 communicating with the drive chamber 5A is formed in the closed container 1 at a position away from the communication hole 7. The stator 3 of the electric motor is integrally mounted on the closed casing 1 in the drive chamber 5A as described above, and the rotor 10 is supported vertically and rotatably at the center of the bearing component 6. It is integrally attached to the rotating shaft 11. A positive displacement oil pump 30 is mounted on the motor-side shaft end of the rotary shaft 11, and the positive displacement oil pump 3
The oil suction port 30A is immersed in the oil reservoir 4 at the bottom of the sealed container 1, and the oil sucked by the positive displacement oil pump 30 is supplied to the oil flow provided at the axis of the rotary shaft 11. Each part is refueled through the road 12.

The compression mechanism section 2 is disposed in the compression mechanism chamber 5B, and includes a fixed scroll component 15 having a fixed scroll 13 integrally formed on a disc-shaped fixed head plate 14, and the fixed scroll 13 An orbiting scroll component 20 in which an orbiting scroll 18 meshing with each other to form a plurality of compression spaces 17 is formed on a disc-shaped orbiting end plate 19.
And so on.

The fixed head plate 14 is tightly fixed to the bearing component 6 by a plurality of bolts 21, and a compressed high-pressure gas is discharged into the compression mechanism chamber 5B almost at the center of the fixed head plate 14. A discharge port 22 is provided. Further, at a position corresponding to the outermost part of the compression space 17 formed by joining the fixed scroll 13 or the fixed end plate 14 and the orbiting scroll 18, the fixed end plate 14 sucks gas. A suction port 23 is provided, and a suction pipe 24 is connected to the suction port 23.

The revolving head plate 19 is combined with the fixed head plate 14 so as to form the compression space 17 at a plurality of locations by integrally sliding the orbiting scroll 18 with the fixed scroll 13 at a plurality of locations. is there. A revolving drive shaft 25 is provided on the surface of the revolving head plate 19 opposite to the revolving scroll 18, and is rotatably fitted to an eccentric drive bearing 11 E of the rotating shaft 11.

The surface of the revolving head plate 19 on the side of the revolving drive shaft is slidably supported on an end surface of an annular plate 26 formed as a separate component from the bearing component 6. The annular plate 26 has an inner diameter of the main shaft 1 of the rotating shaft 11.
It is smaller than the outer diameter of 1A to secure a large sliding surface. Outside the annular plate 26, the suction chamber 16
A low-pressure chamber 27 is formed which can communicate with the low-pressure chamber 2.
A rotation restricting part 28 is provided in the inside 7. The rotation restricting part 28 is provided on the rotating head 1 with respect to the fixed head 14.
9 has a function of always keeping the directionality constant, and an upper ridge 28U in the radial direction is formed on the upper surface of the rotation restricting part 28, and the upper ridge 28U is formed on the lower surface with respect to the upper ridge 28U. A lower protruding ridge 28L in a direction perpendicular to the direction is formed. The lower ridge 28L of the rotation restricting part 28 is
The upper convex ridge 28U is slidably engaged with the guide groove 29 formed on the back surface of the revolving end plate 19. In the above configuration, when the rotating shaft 11 is rotated by the electric motor, the eccentric bearing 11E of the rotating shaft 11 rotates eccentrically. Therefore, the turning head plate 19 is turned while the directionality is kept constant by the rotation restricting component 28. At this time, the compression space 17 gradually moves from the outer circumference to the inner circumference, and the compression space 17 is gradually reduced. Therefore, the gas in the compression space 17 is compressed, and the gas is compressed from the discharge port 22 to the compression mechanism chamber 5B.
Is discharged to The high-pressure gas discharged into the compression mechanism chamber 5B reaches the drive chamber 5A via the communication hole 7, and is discharged from the discharge pipe 8 to the outside. As described above, when the swivel end plate 19 is swirled by the electric motor to compress the gas, the gas is sucked through the suction port 24 via the suction pipe 24.
3 is performed.

On the other hand, oil supplied from the positive displacement oil pump 30 lubricates the eccentric drive bearing 11E and the rotary shaft main shaft 11A through an oil flow passage 12 provided at the axis of the rotary shaft 11. Then, the oil is discharged from the oil discharge port 31.

The rotary shaft 11 is provided with a balance weight 11B close to the bearing component 6 for balancing the eccentric load on the rotary shaft 11 and a cup so as to cover the balance weight 11B. Cover 3
2 is inserted from the same direction as the direction in which the rotating shaft 11 is inserted into the bearing component 6, and fitted into the bearing component 6. A projection 32 </ b> A is provided on the inner surface side of the cover 32 and is engaged with a ring-shaped groove 9 provided on the bearing component 6.

The cover 32 is provided with an oil return hole 16 for returning the oil discharged from the oil discharge port 31 and stored in the cover 32 to the oil sump 4 below the horizontal plane. And the oil is quickly returned to the oil sump 4. The oil reservoirs 4 on both sides of the stator 3 communicate with each other by notches 3A provided in the stator 3, and the oil level at the suction port 30A of the positive displacement oil pump 30 is always maintained in a sufficient state. ing.

[0027]

As described above, the first effect of the present invention is that an electric motor, a compression mechanism driven by the electric motor, and an oil sump at the bottom are arranged in the closed container, and the compression mechanism is fixed to a fixed end plate. A fixed scroll component having a fixed scroll integrally fixed or formed; a orbiting scroll component meshing with the fixed scroll and forming or forming a plurality of compression spaces on orbiting end plate; and a orbiting scroll component A rotation restraining component for restraining the rotation of the rotating scroll component, a rotary shaft for eccentrically rotating the orbiting scroll component, and a bearing component for supporting a main shaft formed at one end of the rotary shaft. An oil outlet for lubricating a portion of the compression mechanism that requires lubrication is provided, and a cover for covering the oil outlet is provided. By providing the oil return hole return,
The object of the present invention is to prevent the discharged oil from being scattered in a closed container by rotation of a rotating shaft or the like, and to be prevented from being discharged from a compressor together with discharge gas, thereby stabilizing the refrigeration cycle and the performance of the compressor. Further, since the discharged oil can be reliably recovered and returned to the oil reservoir, the amount of oil in the closed container can be stabilized, and the reliability of the compressor can be secured. The second effect of the present invention is that, in the horizontal scroll compressor, the oil return hole from the cover to the oil reservoir is provided below the horizontal plane.
Oil can be prevented from scattering from the cover until returning to the sump and a large amount of oil accumulating in the cover, so that the discharged oil can be reliably and quickly returned to the sump and sealed. The amount of oil in the container and the oil level can always be kept stable, and the reliability of the compressor can be ensured.

A third effect of the present invention is that a horizontal scroll compressor is provided with an electric motor inside a closed container, a compression mechanism driven by the electric motor, and an oil reservoir at the bottom, and the compression mechanism is provided with a fixed end plate. A fixed scroll component having a fixed scroll integrally fixed or formed; a orbiting scroll component meshing with the fixed scroll and forming or forming a plurality of compression spaces on orbiting end plate; and a orbiting scroll component A rotating shaft that drives the eccentric orbiting of the orbiting scroll component, and a bearing component that supports a main shaft formed at one end of the rotating shaft, and a balance weight is attached to the rotating shaft. And a cover for covering the balance weight is provided, so that the balance weight provided on the rotating shaft stirs the oil reservoir. By doing so, the input of the compressor increases due to the load on the rotating shaft, and the contact of the balance weight with the oil reservoir is intermittent. This is to prevent the occurrence of current swing. In addition, the oil can be prevented from being scattered by the oil being lifted up by the balance weight. The reliability of the compressor can be ensured.

A fourth effect of the present invention is that an electric motor, a compression mechanism driven by the electric motor, and an oil reservoir are provided at the bottom inside the closed container, and the compression mechanism is fixed or formed integrally with a fixed end plate. A fixed scroll component having a fixed scroll, a orbiting scroll component that meshes with the fixed scroll and forms or rotates a plurality of orbiting scrolls on a revolving end plate, and a rotation that restricts rotation of the orbiting scroll component A constraining component, a rotary shaft for eccentrically driving the orbiting scroll component, and a bearing component for supporting a main shaft formed at one end of the rotary shaft,
The rotating shaft is disposed so as to be inserted into the bearing component from a side opposite to the orbiting scroll component, and a balance weight is formed on the rotating shaft so as to be close to the bearing component. A cover that can be fitted in the same direction as the direction of insertion into the bearing component and covers the balance weight portion, and a projection provided on the inner surface side of the cover engages with a ring-shaped groove provided in the bearing component. By doing so, it is possible to ensure that the cover is fitted into the bearing component, and to prevent the occurrence of abnormal noise and the failure of the compressor due to the detachment of the cover.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a scroll compressor according to the present invention.

FIG. 2 is an enlarged sectional view of one embodiment of a fitting portion of a cover according to the present invention.

FIG. 3 is a perspective view of one embodiment of a cover according to the present invention.

FIG. 4 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 4 Oil reservoir 6 Bearing part 9 Ring-shaped groove 11 Rotating shaft 11B Balance weight 15 Fixed scroll part 16 Oil return hole 19 Revolving end plate 20 Revolving scroll part 32 Cover

──────────────────────────────────────────────────続 き Continued on the front page (72) Michio Yamamura 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Kiyoshi Sawai 1006 Kadoma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shotaro Ito 1006 Odaka Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Sadao Kawahara 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture (72) Inside the Matsushita Electric Industrial Co., Ltd. (72) The inventor Manabu Sakai 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside the Matsushita Electric Industrial Co., Ltd. (JP, A) Japanese Utility Model 63-198492 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (4)

(57) [Claims] 1. A fixed scroll component having a motor, a compression mechanism driven by the motor, and an oil reservoir at the bottom, and a fixed scroll having the compression mechanism fixed or formed integrally with a fixed head plate. A orbiting scroll component fixed or formed on a revolving head plate, the orbiting scroll component meshing with the fixed scroll and forming a plurality of compression spaces; a rotation restricting component for restricting rotation of the orbiting scroll component; A rotary shaft for eccentrically rotating the components, and a bearing component for supporting a main shaft formed at one end of the rotary shaft, wherein the compression mechanism portion lubricates a portion of the compression mechanism requiring lubrication. A scroll having an oil discharge port, a cover for covering the oil discharge port, and an oil return hole for returning oil from the cover into the closed container; Compressor. 2. The scroll compressor according to claim 1, wherein an oil return hole for returning oil from the cover into the closed container is provided below the horizontal plane, and is arranged horizontally. 3. A fixed scroll component having a fixed scroll in which an electric motor, a compression mechanism driven by the electric motor, and an oil reservoir are provided at the bottom, and wherein the compression mechanism is fixed or formed integrally with a fixed end plate. A orbiting scroll component fixed or formed on a revolving head plate, the orbiting scroll component meshing with the fixed scroll and forming a plurality of compression spaces; a rotation restricting component for restricting rotation of the orbiting scroll component; A rotary shaft for eccentrically rotating the components, and a bearing component for supporting a main shaft formed at one end of the rotary shaft, wherein a balance weight is formed on the rotary shaft, and a cover for covering the balance weight is provided. Horizontal scroll compressor. 4. A fixed scroll component having a fixed scroll in which an electric motor, a compression mechanism driven by the motor, and an oil reservoir are provided at the bottom, and the compression mechanism is fixed or formed integrally with a fixed end plate, inside the closed container. A orbiting scroll component fixed or formed on a revolving head plate, the orbiting scroll component meshing with the fixed scroll and forming a plurality of compression spaces; a rotation restricting component for restricting rotation of the orbiting scroll component; A rotary shaft for eccentrically driving the component, and a bearing component for supporting a main shaft formed at one end of the rotary shaft, wherein the rotary shaft is on the opposite side of the bearing component from the orbiting scroll component with respect to the bearing component. And a balance weight is formed on the rotating shaft so as to be close to the bearing component, and the bearing portion of the rotating shaft is formed. A scroll that can be fitted in the same direction as the insertion direction of the cover and that covers the balance weight portion, and a protrusion provided on the inner surface side of the cover is engaged with a ring-shaped groove provided in the bearing component. Compressor.