JPH05215090A - Horizontal open compressor - Google Patents

Abstract

PURPOSE:To improve the durability of a rubber bellows by utilizing the lubricating oil minutely leaked from the seal part of a mechanical seal. CONSTITUTION:A horizontal open compressor has a mechanical seal M near the opening of a casing 1. On the front part of the mechanical seal M, an oil seal 9 for blocking an atmosphere open space, whose rear end part is blocked by a rubber bellows 7 and front end part is opened in the front of a fixed ring 5, is provided, and an oil reservoir space is formed between the rubber bellows 7 and the oil seal 9. The lubricating oil in the casing 1 leaked from the seal part of the mechanical seal is collected in the oil reservoir space to put the rubber bellows 7 in oil atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal open compressor used for a refrigerating machine or the like.

[0002]

2. Description of the Related Art Generally, in a horizontal open compressor in which a compression element is driven by power from an external drive source,
A compression element is arranged on one side in the horizontal casing, and a drive shaft for driving the compression element is made to project outward from an opening of the casing and driven by an external drive source. The pressure inside the casing is higher than that outside the casing (usually 7 to 10 kg).
/ M ² ), a mechanical seal having excellent pressure resistance is interposed between the lid provided around the opening of the casing and the periphery of the drive shaft, and the lid and the periphery of the drive shaft are connected to each other. The gap between them is sealed.

However, a conventional mechanical seal is disclosed in Japanese Patent Application Laid-Open No. 2-45686, and has a rear sealing surface A and is fixed near the opening of the horizontal casing B, as schematically shown in FIG. A fixed ring D, a rotary ring G disposed behind the fixed ring D, having a front seal surface E that contacts the rear seal surface A, and rotating together with the drive shaft F, and a rear portion of the rotary ring G. Position and is tightly fitted to the drive shaft F,
A cylindrical rubber bellows H whose front portion is in close contact with the rotating ring G, and a spring I for pressing the rotating ring G toward the fixed ring D side.
The front seal surface E of the rotary ring G is elastically brought into contact with the rear seal surface A of the fixed ring D by the spring reaction force of the spring I.

Further, in the above horizontal open compressor,
Lubricating oil is supplied to the mechanical seal through an oil supply passage J provided in the drive shaft F.

[0005]

By the way, the rubber bellows H constituting the mechanical seal is cured by heat when it is placed in the outside air atmosphere as compared with when it is placed in the oil atmosphere, as is known in the art. However, in the compressor provided with the mechanical seal having the above structure, the fixed ring D and the rotary ring G contact each other at their seal surfaces A and E to rotate relative to each other, thereby generating heat, and The gap K formed between the inner peripheral surfaces of the ring D and the rotating ring G and the outer peripheral surface of the drive shaft F is sealed in the casing B by the rubber bellows H on the rear end side thereof. Since the front end side of the gap K, that is, the opening side of the casing B is open to the outside of the casing B, the gap K
The inside is in an outside air atmosphere, and is affected by the heat generated in the outside air atmosphere.

Therefore, the rubber bellows H is heated particularly in a state where the inner peripheral surface thereof is always exposed to the outside air, so that the rubber bellows H is prematurely deteriorated, and the elastic force of the rubber is lost or cracks occur. Then, there is a problem that gas refrigerant or oil leaks.

In the mechanical seal of the present invention, the mechanical seal is supplied to the gap through a seal portion, for example, a contact portion between the rear seal surface of the fixed ring and the front seal surface of the rotary ring. The purpose is to allow the rubber bellows to be placed in an oil atmosphere by using a small amount of lubricating oil that leaks from the seal part of the mechanical seal. Another object of the present invention is to provide a compressor capable of improving the durability of the rubber bellows.

[0008]

According to the present invention, the drive shaft 4 for driving the compression element 3 is projected outward from the opening of the casing 1, while the rear sealing surface is provided near the opening of the casing 1. A fixed ring 5 having 50 and attached to the casing 1, and a rotary ring 6 arranged behind the fixed ring 5 and having a front sealing surface 60 in contact with the rear sealing surface 50 and co-rotating with the drive shaft 4. The rotary ring 6 is located at the rear part of the rotary ring 6 and is closely fitted to the drive shaft 4, and the front part of the rotary ring 6 is
Mechanical seal M provided with a rubber bellows 7 that is in close contact with the fixed ring 5 and a spring 8 that presses the rotary ring 6 against the fixed ring 5.
In the horizontal open compressor provided with the oil, an oil for closing an atmosphere opening gap T, in which the rear end is closed by the rubber bellows 7 and the front end is opened in front of the fixed ring 5, is provided at the front of the mechanical seal M. A seal 9 is provided, and an oil storage space S is formed between the rubber bellows 7 and the oil seal 9.

[0009]

According to the present invention, the lubricating oil in the casing 1 leaking from the seal portion of the mechanical seal is stored in the oil storage space S, and the inner peripheral surface of the rubber bellows 7 is placed in the oil atmosphere. Therefore, the rubber bellows 7 is not deteriorated at an early stage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The horizontal open compressor shown in the drawings has a frame 2 assembled in a horizontal casing 1 having one side closed in the horizontal direction and the other side opened, and a fixed scroll is installed inside the closed side of the casing 1. A compression element 3 composed of 31 and an orbiting scroll 32 is arranged.

A drive shaft 4 extending in the lateral direction is rotatably supported on the frame 2 via a pair of left and right bearings 21 and 22, and one end side of the drive shaft 4 in the axial direction is compressed by the compressor element 3.
Of the revolving scroll 32 through the eccentric drive section 40, while forming a through hole 11 in the lid 10 attached to the other side opening of the casing 1 so that the other end of the drive shaft 4 passes through the through hole 11. The orbiting scroll 32 is fixed to the fixed scroll 31 by projecting outward from the hole 11 and rotating the drive pulley 41 fixed to this projecting end by an external drive source.
It is designed to be driven around the orbit.

Further, inside the frame 2, between the lid 10 provided at the opening of the casing 1 and the outer peripheral surface of the drive shaft 4, a mechanical seal M for sealing the both is provided. Is intervening.

This mechanical seal M is basically
A fixed ring 5 having an axial rear end surface as a rear seal surface 50, a rotary ring 6 having an axial front end as a front seal surface 60 that contacts the rear seal surface 50, and a close fit to the outer periphery of the drive shaft 4. A cylindrical rubber bellows 7 and a coil-shaped spring 8 that presses the rotary ring 6 toward the fixed ring 5 are provided, and an O-ring is formed inside the through hole 11 in the lid 10. While the fixed ring 5 is fitted via 51, the rotary ring 6 is supported by the drive shaft 4 at the rear position of the fixed ring 5 so as to be movable only in the axial direction, and the rotary ring 6 is driven by the drive shaft 4. It is designed to rotate with the axis 4.

Further, the rubber bellows 7 is provided on the drive shaft 4
Fixed cylindrical portion 71 that can be tightly fitted to the outer peripheral surface of the fixed cylindrical portion 71
Telescopic tube portion 72 extending forward from the front end of the telescopic tube portion 7 and the telescopic tube portion 7
2 and a flange portion 73 that projects radially outward from the front end of the flange 2. The fixed cylinder portion 71 is fitted to a rear position of the rotary ring 6 on the drive shaft 4 so that the front end of the flange portion 73 is fixed. A seal cover 70 is fitted over the outer periphery of the rotary ring 6 and the rubber bellows 7 while closely contacting the axially rear end face of the rotary ring 6.

The spring 8 is interposed between a spring receiver 42 assembled to the drive shaft 4 and a flange 70a provided at the front end of the seal cover 70, and the spring reaction force of the spring 8 causes The elastic cylinder portion 72 of the rubber bellows 7, the collar portion 73 and the rotary ring 6 are biased toward the fixed ring 5 side,
The front seal surface 60 is constantly in pressure contact with the rear seal surface 50.

Thus, the elastic tube portion 7 of the rubber bellows 7
2. The atmosphere open gap T formed between the inner peripheral surfaces of the rotary ring 6 and the fixed ring 5 and the outer peripheral surface of the drive shaft 4 is sealed to the internal space of the casing 1.

On the other hand, an oil supply pump 23 is provided on the frame 2, an oil reservoir 1a is provided on the inner bottom portion of the casing 1, and the lubricating oil stored in the oil reservoir 1a is supplied to the oil supply pump 23.
And is supplied to the eccentric drive part 40 of the compression element 3, the bearings 21 and 22, and the mechanical seal M through an oil supply hole 43 formed in the shaft core part of the drive shaft 4. ..

In the above-described compressor, however, in the embodiment shown in the drawings, the inner peripheral surface of the front end portion of the fixed ring 5 in the axial direction is notched so that the front end portion of the fixed ring 5 penetrates the lid 10. An annular space 52 that faces the hole 11 is formed, and an oil seal 9 that seals the front end portion of the atmosphere opening gap T is provided in the space 52 to connect the rubber bellows 7 and the oil seal 9. The oil reservoir space S is formed between them, and the oil seal 9 shown in the figure has a seal body 91 tightly fitted to the outer peripheral surface of the cavity 52, and an extension extending from one end of the seal body 91 to drive the drive. Lip 92 that contacts the outer peripheral surface of shaft 4
And is fitted to the outer periphery of the lip 92,
And a garter spring 93 that presses against the outer peripheral surface of the drive shaft 4.

Thus, in the compressor having the above structure, a part of the lubricating oil supplied to the mechanical seal M through the oil supply hole 43 when the oil supply pump 23 is driven is partially replaced by the rear seal. The oil leaks into the oil storage space S through the contact portion between the surface 50 and the front seal surface 60, and the oil storage space S
Since the inside of the oil bellows 7 is filled with the oil, the inner peripheral surface of the rubber bellows 7 exposed in the oil reservoir space S is placed in an oil atmosphere. The elastic force of can be maintained for a long time.

[0020]

As described above, according to the present invention, the drive shaft 4 for driving the compression element 3 is projected outward from the opening of the horizontal casing 1, while the rear sealing surface 50 is provided near the opening of the casing 1. The drive shaft 4 having a fixed ring 5 attached to the casing 1 and a front seal surface 60 disposed behind the fixed ring 5 and contacting the rear seal surface 50.
A rotary ring 6 which rotates together with the rotary ring 6, and a rubber bellows 7 and a rotary ring 6 which are located at a rear portion of the rotary ring 6 and which are tightly fitted to the drive shaft 4 and whose front portion closely contacts the rotary ring 6;
In a horizontal open compressor provided with a mechanical seal M having a spring 8 that presses against, a front end of the mechanical seal M is closed by the rubber bellows 7 and a front end of the fixed ring 5 is provided. The casing 1 that leaks from the seal portion of the mechanical seal is provided by providing the oil seal 9 that closes the atmosphere opening gap T that is open to the front and forming the oil reservoir space S between the rubber bellows 7 and the oil seal 9. Since the lubricating oil therein can be stored in the oil storage space S and the inner peripheral surface of the rubber bellows 7 can be placed in an oil atmosphere, the rubber bellows 7 can be prevented from prematurely degrading and the rubber bellows 7 The elastic force can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a main part of a horizontal open compressor according to the present invention.

FIG. 2 is a vertical sectional view of the right half of the horizontal open compressor according to the present invention.

FIG. 3 is a vertical cross-sectional view of the left half of the horizontal open compressor according to the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of a conventional horizontal open compressor.

[Explanation of Codes] 1 Horizontal casing 3 Compressor element 4 Drive shaft 5 Fixed ring 50 Rear sealing surface 6 Rotating ring 60 Front sealing surface 7 Rubber bellows 8 Spring 9 Oil seal T Atmosphere release gap S Oil reservoir space M Mechanical seal

Claims (1)

[Claims] 1. A horizontal casing 1 is internally provided with a compression element 3 on one side thereof, and a drive shaft 4 for driving the compression element 3 is projected outward from the other side opening of the casing 1, while the casing is also provided. 1, a fixed ring 5 having a rear sealing surface 50 to be attached to the casing 1, and the fixed ring 5
A rotary ring 6 disposed rearward of the rotary ring 6 and having a front seal surface 60 contacting the rear seal surface 50 and co-rotating with the drive shaft 4; A horizontal open compressor provided with a mechanical seal M fitted with a rubber bellows 7 having a front portion in close contact with the rotary ring 6 and a spring 8 for pressing the rotary ring 6 against the fixed ring 5. At the front of the mechanical seal M, the rear end is closed by the rubber bellows 7 and the front end is the fixed ring 5.
The horizontal open compressor is characterized in that an oil seal 9 that closes an air opening gap T that opens to the front is provided, and an oil storage space S is formed between the rubber bellows 7 and the oil seal 9.