JPH07229490A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a tilt preventing mechanism that supports that back circumferential part of a turning scroll with uniform pressure from the frame side in a scroll compressor. CONSTITUTION:In this scroll compressor, plural pieces of interconnecting grooves 15 ranging from a discharge chamber to a motor chamber 16 along an inner wall of a hermetically sealed vessel 1 are formed in each circumferential part of a fixed scroll 4 and a frame 9 at regular intervals. A projection 9b corresponding to these interconnecting grooves 15 is formed in an annular recess 9a on top of the frame 9, and a blowoff port 9b and a through port 9c are connectedly bored in these interconnecting grooves 15 from the center of this projection 9b. In addition, a sealant 24 sliding in contact with the back of an end plate 5a surrounding this blowoff port 9d is installed on top of the projection 9b. A bore diameter of the blowoff port 9d is set up by the specified pressure uplifting the end plate 5a via a high pressure coolant and lubricating oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a tilt prevention mechanism for an orbiting scroll during operation.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional scroll compressor.
It will be described based on. As shown in FIG. 3, the scroll compressor includes a compression unit 2 and an electric motor 3 in a sealed container 1. The compression unit 2 is mainly composed of a fixed scroll 4, an orbiting scroll 5, an Oldham ring 6, a crank shaft 7, an eccentric bearing 8, a frame 9, a crank bearing 10, and a shaft 11. In this configuration, the fixed end plate 4
The fixed scroll 4 is integrally formed with a fixed scroll wrap 4b on a, and the fixed scroll 4 is fixed to the frame 9, the swirl wrap 5b is fixed on the revolving end plate 5a, and the revolving drive shaft 5c is formed on the back. 5 and 5 are meshed with each other to form a plurality of compression chambers 12. When the electric motor 3 is rotated, the orbiting scroll 5 is rotated by the orbiting drive shaft 5c through the eccentric bearing 8 fitted to the crankshaft 7 formed on the shaft 11, and the Oldham ring 6 prevents the orbiting scroll 5 from rotating. By the orbiting motion of the orbiting scroll 5, the suction pipe 13
The low-pressure refrigerant sucked into the compression section 2 from is compressed while becoming a high-pressure refrigerant while sequentially moving from the outer peripheral portion to the central portion of the compression chamber 12. This high-pressure refrigerant is supplied into the compression chamber 12 and is discharged from the discharge port 14 together with the lubricating oil that becomes mist while lubricating each sliding portion, passes through the communication passage 15, and is discharged from the lower portion of the frame 9 and the upper portion of the electric motor 3. Guided to the motor room 16 consisting of space,
Mist-like lubricating oil is attached in the middle of the path to reduce the oil-containing content and then discharged from the discharge pipe 17. During the operation of the scroll compressor, as the pressure in the compression chamber 12 rises, a thrust force for separating the fixed scroll 4 and the orbiting scroll 5 in the axial direction is generated. When the fixed scroll 4 and the orbiting scroll 5 are separated by this thrust force,
The sealing of the axial end faces of the wraps 4b and 5b in contact with the end plates 4a and 5a becomes incomplete, and the leakage of the refrigerant increases, resulting in a decrease in efficiency. Therefore, the high-pressure refrigerant sent to the motor chamber 16 through the communication passage 15 is provided in the space surrounded by the annular tip seal 20 provided on the upper surface of the frame 9 around the orbiting drive shaft 5c of the orbiting scroll 5. A high pressure chamber 19 into which lubricating oil is introduced is formed, and the back surface of the end plate 5a of the orbiting scroll is pushed up by a pressure that opposes the thrust force at the center of the compression chamber 12 where the refrigerant pressure is high. On the other hand, on the outside of the tip seal 20, a low pressure chamber 21 is formed in communication with the outer peripheral portion of the compression chamber 12 having a low refrigerant pressure, and the thrust force applied to the end plate 5a of the orbiting scroll is balanced in the radial direction. However, with respect to the force acting in the direction in which the end plate 5a is tilted, which occurs because the thrust force is not a point object, the end plate 5a
The method of holding the outer circumference of the device at a low pressure is not very effective, and there is a problem that the compressed refrigerant leaks and the efficiency is reduced.

[0003]

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an inclination preventing mechanism for supporting the outer peripheral portion of the rear surface of the end plate of an orbiting scroll with a uniform pressure from the frame side. And

[0004]

According to the present invention, a compression section and an electric motor are arranged in a hermetic container, and the compression section is engaged with a spiral scroll and a fixed scroll to form a compression chamber. Orbiting scroll, an Oldham ring that prevents rotation of the orbiting scroll, a shaft that pivotally drives the orbiting scroll by forming a crankshaft at the upper end, and a frame that supports the crankshaft,
A plurality of communication grooves from the discharge chamber to the motor chamber are formed at equal intervals on the outer periphery of the fixed scroll and the frame to which the fixed scroll is fixed, and a plurality of protrusions corresponding to the communication grooves are formed in an annular recess on the upper surface of the frame. And a through hole that connects the protruding portion and the communication groove to each other is formed, and the protruding portion is provided with a sealing material that comes into pressure contact with the back surface of the orbiting scroll. Also, the number of the protrusions and the area surrounded by the sealing material are such that the sum of the pressures of the high pressure chamber and the protrusions that push the back surface of the orbiting scroll against the thrust force of the compression chamber is slightly large. The diameter of the blowout hole formed in the protruding portion is set so that the lubricating oil flowing out to the upper surface of the protruding portion is set to an appropriate oil amount for pushing the back surface of the orbiting scroll, and the through hole is projected into the protruding portion. It is characterized in that a hole having a diameter larger than the diameter of the blowout hole formed in the portion is formed.

[0005]

According to the present invention, the support mechanism is constructed so that the end plate of the orbiting scroll is not tilted even if a locally acting force that tilts the end plate of the orbiting scroll is applied depending on the operating condition of the scroll compressor. There is. From the communication groove formed at equal intervals on the outer periphery of the frame and the fixed scroll, through the through hole and the blow hole drilled in the projection formed in the annular recess on the upper surface of the frame corresponding to the communication groove, swirl around the blow hole Guide the high-pressure refrigerant and lubricating oil to the area surrounded by the sealing material that is in contact with the back surface of the scroll end plate, and evenly support the outer peripheral part of the back surface of the end plate with the pressure set by the area surrounded by the seal material and the diameter of the blowout hole. be able to.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The components of this embodiment are the same as the conventional example shown in FIGS. 1 and 2 except for the fixed scroll, the frame, the blowout portion, and the sealing material, and therefore the description of the overall configuration is omitted. The same numbers are used for the components. As shown in FIG. 1, in the fixed scroll 4 fixed to the frame 9 and the frame 9, communication grooves 15 extending from the discharge chamber 18 (not shown) to the motor chamber 16 are formed at equal intervals. on the other hand,
A projecting portion 9b corresponding to the communication groove 15 is formed in the annular recess 9a on the upper surface of the frame 9, and a blowout hole 9d and a through hole 9c are formed in the communication groove 15 from the center of the projecting portion 9b. A seal member 24 is provided on the upper surface of the protruding portion 9b so as to surround the air outlet 9d and to come into contact with the rear surface of the end plate 5a of the orbiting scroll 5 to slide. Here, the number of the protruding portions 9b and the diameter of the blowout holes 9d are set by the required pressure for pushing up the end plate 5a of the orbiting scroll 5 through the high pressure refrigerant and the lubricating oil, and the hole diameter of the through hole 9c is processed into the frame 9. Blowout hole 9d for easy operation
It has a large perforation compared to. Another embodiment will be described. As shown in FIG. 2, the communication groove 15 is formed similarly to FIG. On the other hand, the annular recess 9a on the upper surface of the frame 9
A recess 9e corresponding to the communication groove 15 is formed in the
A through hole 9c is formed in the communication groove 15 from the center. A cylindrical projecting body 23 having a blowout hole 22 in the center is formed, and a sealing material 24 that surrounds the blowout hole 22 and slides in contact with the back surface of the end plate 5a of the orbiting scroll 5 is provided on the upper surface of the projecting body 23. The protrusion 23 is fitted in the recess 9b to communicate the blowout hole 22 and the through hole 9c. Here, the number of the projections 23 and the hole diameter of the blowout hole 22 are set by the required pressure for pushing up the end plate 5a of the orbiting scroll 5 through the high-pressure refrigerant and the lubricating oil, and the hole diameter of the through hole 9c is processed into the frame 9. The holes are made larger than the blow-out holes 22 to facilitate the operation. A mechanism for preventing a decrease in efficiency due to refrigerant leakage in the compression chamber 12 due to the thrust force of the compression chamber 12 on the orbiting scroll 5 and refrigerant leakage due to the inclination of the orbiting scroll 5 will be described. The lubricating oil pushed up to the upper surface of the crankshaft 7 passes through the drive shaft oil supply groove 5d and is filled in the high pressure chamber 19 defined by the tip seal 20 at the center of the rear surface of the turning end plate 5a.
The turning mirror plate 5a is pressed upward against the thrust force of the high pressure refrigerant in the center of the compression chamber 12. On the other hand, the orbiting scroll 5 provided in the annular recess 9a on the upper surface of the frame 9
The high pressure refrigerant and the lubricating oil are guided from the communication groove 15 to the upper surface of the protruding portion 9b or the protruding body 23 that slides in contact with the rear surface of the end plate 5a, and the outer peripheral portion of the rear surface of the end plate 5a is supported at multiple points, and the orbiting scroll 5 Prevents the tilt of. The push-up force that opposes the thrust force by the compression chamber 12 is adjusted to a pressure that does not hinder the orbiting movement of the orbiting scroll 5 and reduce the efficiency.

[0007]

Therefore, as in the present invention, the protrusion provided on the upper surface of the frame so as to come into contact with the rear surface of the end plate of the orbiting scroll, the high pressure refrigerant and the lubricating oil are introduced from the communication groove to the outer peripheral portion of the rear surface of the end plate. By supporting at multiple points, the orbiting scroll can be prevented from tilting and the scroll compressor can be operated without lowering the efficiency.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a scroll compressor showing an outline of an embodiment of the present invention.

FIG. 2 is a plan view and a cross-sectional view taken along the arrow of a frame showing another embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a scroll compressor showing an outline of a conventional example.

[Explanation of symbols]

 1 sealed container 4 fixed scroll 4a fixed end plate 4b fixed wrap 5 orbiting scroll 5a swivel end plate 5b swivel wrap 5c swivel drive shaft 9 frame 9a annular recess 9b protruding part 9c through hole 9d blowout hole 9e recess 12 compression chamber 15 communication groove 16 motor chamber 18 Discharge chamber 19 High pressure chamber 20 Tip seal 21 Low pressure chamber 22 Air outlet 23 Projection body 24 Sealing material

Claims (4)

[Claims] 1. A compression unit and an electric motor are arranged in a sealed container,
The compression part includes a spiral fixed scroll, an orbiting scroll that meshes with the fixed scroll to form a compression chamber, an Oldham ring that prevents rotation of the orbiting scroll, and a crankshaft at the upper end. A plurality of communication grooves extending from the discharge chamber to the motor chamber are formed on the outer periphery of the shaft that drives the orbiting scroll and a frame that supports the crankshaft, and the fixed scroll and the fixed scroll are fixed to the frame. Formed at equal intervals, a plurality of protrusions corresponding to the communication groove are formed in an annular recess on the upper surface of the frame, a through hole that connects the protrusion and the communication groove is formed, and the protrusion has the above-mentioned A scroll compressor characterized in that a sealing material is provided on the back surface of the orbiting scroll so as to come into pressure contact therewith. 2. The number of the projections and the area surrounded by the sealing material are such that the sum of the pressures of the high pressure chamber and the projections that push the back surface of the orbiting scroll against the thrust force of the compression chamber is slightly large. The scroll compressor according to claim 1, wherein the scroll compressor is set as follows. 3. The diameter of the blow-out hole of the protrusion is set so that the lubricating oil flowing out to the upper surface of the protrusion has an appropriate oil supply amount for pushing the rear surface of the orbiting scroll. The scroll compressor described in 1 and 2. 4. The scroll compressor according to claim 1, wherein the through hole is formed with a diameter larger than a diameter of the blowout hole formed in the projecting portion.