JPS5960093A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enlarge the hole diameter of a discharging port and reduce the hydraulic loss of high-pressure gas passing through the discharging port by a method wherein a notched groove, communicating with the discharging port and extending from the discharging port into the direction of the height of a blade, is formed on the side of a fixed scroll blade. CONSTITUTION:The discharging port 24 is enlarged to the side of the fixed scroll blade 23 and the port diameter is enlarged to the size (d2) compared with the port diameter (d1) of the conventional discharging port shown by an one- dot chain line. Further, the notched groove 23a, communicating with the discharging port 24, is formed on the side surface of the fixed scroll blade 23 while the bottom surface thereof has an arced surface having the same curvature with a part of the discharging port 24 and the groove extends from the discharging port 24 into the direction of the height of the blade thereby arriving at the end of the blade. According to this method, the hydraulic loss of the gas, pressurized in the compression chamber, may be reduced when it is passing through the discharging port 24, whose hole diameter is enlarged, thus, a compression efficiency may be improved and a high compression ratio may be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scroll compressor, and particularly to a scroll compressor in which the pore diameter of the discharge boat is enlarged to improve compression efficiency.

[Technical background and problems of the invention]

In general, a scroll compressor has spiral-shaped orbiting scroll blades engaged with spiral-shaped fixed scroll blades, and the gas sucked in from the suction port is compressed between the fixed scroll blade and the orbiting scroll blade. Confined in a chamber, the volume of the compression chamber is gradually reduced as the orbiting scroll blades rotate.

During this time, the gas is compressed to release high pressure, and the high pressure gas is discharged into the discharge chamber from the discharge port provided near the center of the spiral of the fixed scroll blade.The principle itself is well known. be.

(In the Dm compressor, during the compression process.

The fixed scroll blade and the orbiting scroll blade are always in contact at two blade bellies, and a compression chamber is defined between them.

Eventually, the volume of the compression chamber becomes considerably smaller,
This makes it possible to increase the pressure of the gas. Therefore, since the discharge boat must open into the compression chamber of the final compression stage, its size has been limited to an extremely small one. When the discharge port is small in this way, a large fluid loss occurs in the gas, which reduces operational efficiency, and often causes noise and vibration.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the drawbacks of the prior art.

An object of the present invention is to provide a scroll compressor that can reduce fluid loss, noise, and vibration when gas passes through a discharge port, and at the same time maintain a high compression ratio.

[Summary of the invention]

In order to achieve the above object, 1 the present invention is to form a notched groove extending in the blade height direction from the discharge front on the blade vent surface of a fixed scroll blade so as to enlarge the hole diameter of the of Re discharge port. It is characterized by

[Embodiments of the invention]

Embodiments of a scroll compressor according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a closed casing;
A mounting frame 2 is press-fitted into the inside of the casing 1. In this mounting frame 2, a housing chamber 3, a head receiving hole 4, and a bearing hole 5 are formed in stages.

A drive shaft 6 is rotatably fitted into the bearing hole 5, a shaft head 7 at the upper end of the drive shaft 6 is loosely fitted into the head receiving hole 4, and a lower end surface 7a of the shaft head 7 is attached to the mounting frame. It is supported by 2. In addition, the drive shaft 6 is connected to the casing 1
The lubricating oil 8 extends downward, and its lower end is immersed in lubricating oil 8 stored at the bottom of the casing 1 .

Further, a rotor 9 constituting a drive motor is fixed on the axis of the drive shaft 6. On the other hand, a stator 10 is arranged concentrically on the outside of the rotor 9, and the stator 10 is placed on the side of the casing 1. is maintained.

On the other hand, the shaft head 7 has an axial center (included) of the drive shaft 6. An eccentric hole 11 is formed with its center offset from the center.

This eccentric hole 11 has a pivot (3
) The driven shaft 13 of the scroll is loosely fitted, and the driven shaft 1
A blade support disk 14 is integrally connected to the blade support disk 3, and a spiral scroll blade 15 (see FIG. 2) is integrally formed on the upper surface of the blade support disk 14. The above orbiting scroll blade 1
5 has a rectangular cross section and has a wing tip surface 15a and wing ventral surfaces 15b and 15c that are parallel to each other. The wing support disk 14 is supported on its lower surface by an Oldham ring 16.
is a ring having a rectangular cross section, and as is clear from FIG. 3, key grooves 17 and 18 are formed on both end faces thereof in a perpendicular relationship to each other. Of these, keyway 1
8 is fitted with a diametrical key 19 provided on the bottom surface of the accommodation chamber 3, while the other key groove 17 is attached to the lower surface of the wing support disk 14 and is perpendicular to the key 19. It is fitted with a certain key 20. Therefore, the driven shaft 13 moves in a circular motion due to the rotation of the driving shaft 60, but the orbiting scroll 12 moves in an orbiting motion due to the action of the Oldham ring 160.

Thus, above the mounting frame 2, a (4) Niroud 21 is fixed so as to sandwich the orbiting scroll 12, and this Niroud 21 has an annular suction chamber 22 on the inner and outer sides, and is further fixed on the inside thereof. scroll wing 23
As shown in FIG.
A discharge outlet (N-) 24 is opened at the center of the spiral 3. The fixed scroll blade 23 is manufactured to have the same shape and size as the orbiting scroll blade 15, and is processed so that the height of the blade is exactly the same.

In addition, as shown in FIGS. 4 and 5, the discharge port 24 is enlarged toward the blade vent side of the fixed scroll blade 23, and has a diameter d of the conventional discharge port yie-) shown by the dashed line. On the other hand, the diameter of the discharge port 240 according to the present invention is widened to d2. Furthermore, the blade vent surface of the fixed scroll blade 23 has an arcuate surface having the same curvature as a part of the blade 24, extending from the discharge port 24 in the height direction of the blade and reaching the blade tip.

The entire surface may be inclined as shown in FIG. 8 and FIG. 9, or only a portion may be inclined as shown in FIGS. Providing such an inclined groove has the advantage of increasing the strength of the fixed scroll R23.

A suction pipe 25 passing through the casing 1 from the side is connected to the suction chamber 22.

A discharge chamber 26 is formed between the shroud l'21 and the top plate of the casing 1, and a discharge pipe 27 is connected to this discharge chamber 26.

Further, an oil passage 28 is formed in the drive shaft 6, and this oil passage 28 is composed of an inlet oil passage 29, a communication oil passage 30, and an outlet oil passage 31, and an inlet I of the inlet oil passage 29 is formed. -G29
a opens at the axial center position of the drive shaft 6, and the outlet port 29b is located below the bearing hole 5.

Further, the outlet oil passage 31 is formed in a hook shape, and the inlet port 31
a opens at the second position of the bearing hole 5, and the outlet port 31b
is opened at a position eccentric from the axial center of the drive shaft 6, and an oil reservoir chamber 32 is formed below the shaft end of the driven shaft 13. Therefore, when the drive shaft 6 rotates, the exit=1? = 1-31 Since b is in an eccentric position, lubricating oil passes through the oil feed path z3 and into the oil reservoir chamber 32 under the action of centrifugal force.
It is designed to be supplied internally.

In the scroll compressor having such a configuration, when the driven shaft 13 is caused to make a circular motion around the axis of the drive shaft 6 by the rotation of the drive shaft 6, the two orbiting scrolls 12 are moved by the action of the Oldham ring 16. make a rotating movement. Then, the gas sucked into the suction chamber 22 from the suction nozzle 25 is compressed into two compression chambers 34 formed between the orbiting scroll blade 15 and the fixed scroll blade 23.
The volume of the compression chamber is gradually reduced as the orbiting scroll g15 rotates, and the gas is compressed and discharged into the discharge chamber from the discharge port 24 at the end of the compression process. Figure 2 shows the fixed scroll blade 2 during the compression process.
3 and the orbiting scroll blade 15, and it can be seen that the volumes of the compression chambers C and C3 gradually change as they move from (a) to (d).

Since the hole diameter of the discharge port z-1-24 is enlarged compared to the conventional one, the fluid loss that occurs when high-pressure gas passes through the discharge port 24 is extremely small. Moreover, since the volume of the compression chamber at the final stage is almost the same as in the conventional case, the compression ratio of the gas is maintained as is.

〔Effect of the invention〕

As described above, one aspect of the present invention is to form a notched groove in the blade belly of a fixed scroll blade that communicates with a discharge port and extends from the discharge port in the height direction of the blade.

Since the hole diameter of the discharge port is enlarged, fluid loss when the high-pressure gas in the compression chamber passes through the discharge port can be extremely reduced, and compression efficiency can be improved. Moreover, since there is almost no change in the volume of the compression chamber, a great effect can be obtained in that a high compression ratio can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a scroll capacitor according to the present invention, and FIGS. 2(a) and (b)
. FIG. 2 is a bottom view, a cross-sectional view taken along the line B-B, a bottom view, and a cross-sectional view taken along the line CC, showing a discharge port forming portion in FIG. DESCRIPTION OF SYMBOLS 12... Orbiting scroll, 15... Orbiting scroll wing, 21... Shroud, 23... Fixed scroll wing, 23a... Notch groove, 24... Discharge port. Applicant's representative Kiyoshi Inomata 80゛Figure 5I3W 7F] No. pH

Claims (1)

[Scope of Claims] An orbiting scroll vane is engaged with a spiral fixed scroll vane protruding from the inside of a shroud, and the orbiting scroll vane is driven to orbit. A scroll compressor that compresses gas by utilizing a change in volume of a compression chamber formed between both scroll blades, and discharges high-pressure gas from a discharge port formed in the above-mentioned shape; the fixed scroll blade; A scroll compressor characterized in that a notch groove is formed in the blade belly of the blade to communicate with the discharge port and extend from the discharge boat in the blade height direction, thereby enlarging the hole diameter of the discharge port.