JPH0421035Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a scroll compressor used for compressing refrigerant or air in refrigeration equipment, air conditioners, etc.

[Conventional technology]

FIG. 6 is a sectional view of a conventional scroll compressor shown in Japanese Patent Application No. 59-64571, for example.
This is an example in which a scroll compressor is applied to a refrigeration system or an air conditioning system, and is configured as a compressor for a gas such as fluorocarbon. In the figure, 1 is a fixed scroll, 1a is a fixed scroll end plate, 1b is a fixed scroll side plate, 2 is an oscillating scroll, 2a is an oscillating scroll end plate, and 2b is an oscillating scroll side plate. 3 is a compression chamber, 4 is a suction chamber of the compression chamber 3, 5 is a suction hole provided on the outer periphery of the fixed scroll 1, 6 is a discharge hole formed in the center of the fixed scroll end plate 1a, 7 is a discharge pipe, 8 is a bearing support that supports a main shaft 9, which will be described later, and 8a is an oil return hole that drains oil from this bearing support 8. 9 is a main shaft serving as a crankshaft for driving the swinging scroll 2; 9a is an oil supply hole provided eccentrically from the axis of the main shaft 9 and penetrating in the axial direction; and 10 is an electric motor that rotates the main shaft 9. 11 is an oil pump attached to the lower end of the main shaft 9 by shrink fitting, etc.; 12 is a lower shell that houses the above-mentioned components; 13 is an upper shell that seals the entire compressor by fitting and welding with the lower shell 12; 12 and each member is fixed by shrink fitting the outer peripheral member of the bearing support 8. 14 is a suction pipe provided on the side surface of the lower shell 12 and introduces suction gas into the interior from the lower part of the shell, and 15 is oil stored at the bottom of the lower shell 12. Moreover, 16 is a shell inner space formed by the lower shell 12 and the upper shell 13, and serves as a low pressure space filled with intake gas.

Next, the operation will be explained. When the scroll compressor is energized, the driving force generated by the electric motor 10 rotates the main shaft 9, causing the swinging scroll 2 to rotate. This causes the swinging scroll 2 to maintain an angularly constant posture with respect to the bearing support 8. A compression action is performed to perform a so-called rocking motion, which is a movement while maintaining the same. While such a compression action is being performed, gas is drawn into the compressor from the suction pipe 14 as shown by the solid line arrow in FIG. It is sucked into the suction chamber 4 through the suction hole 5 of the scroll 1 . Then, it is compressed as described above and discharged from the discharge pipe 7 through the discharge hole 6.

During the movement of the compressor, the oil in the lower shell 12 is sucked in from the tip of the oil pump 11 as shown by the dashed arrow, and rises in the oil supply hole 9a due to the centrifugal force generated by the rotation of the main shaft 9, causing the oil to oscillate. After lubricating the sliding parts of the scroll 2, the main shaft 9, etc., it passes through the oil return hole 8a, falls through the shell inner space 16, and is returned to the bottom of the lower shell 12. At this time, some of the oil is sucked into the suction chamber 4 without returning from the oil return hole 8a,
The compressed gas is discharged from the discharge pipe 7 through the discharge hole 6 to the outside of the compressor. The discharged oil then circulates through the refrigeration cycle and flows into the compressor again through the suction pipe 14.

[Problem that the invention attempts to solve]

Since the conventional scroll compressor is configured as described above, the gas sucked in by the suction pressure in the suction chamber 4 is compressed in the compression chamber 3, and reaches the final compression (uniquely determined by the suction pressure). Thereafter, it is discharged from the compressor through the discharge pipe 7 and connected to the condenser. At this time, when the condensation pressure and the final pressure differ, overcompression or undercompression occurs, causing pressure pulsations within the discharge pipe 7. This causes vibration and noise to be generated through the discharge pipe 7. Additionally, if refrigerant liquid or the like is sucked into the suction chamber 4 during sleep startup, a type of clogging phenomenon due to the viscous resistance of the liquid within the discharge pipe 7 may cause an abnormal pressure increase in the discharge pipe 7, resulting in a startup failure. It was hot. One possible solution to this problem is to install a discharge muffler, but for example,
As shown in Publication No. 125386, when the discharge muffler is fastened to the fixed scroll with multiple bolts via O-rings and gaskets, the shape is complicated and assembly is complicated, and the discharge muffler is difficult to assemble in the low-pressure shell space. When the muffler was housed, there were problems such as difficulty in taking out the discharge pipe 7 from the shell.

This idea was made to solve the above problems, and can effectively attenuate discharge pressure pulsations and prevent startup failures during sleep startup.
The purpose is to obtain a scroll compressor with a simple structure and high reliability.

[Means for solving problems]

The scroll compressor according to this invention includes a discharge muffler that forms a discharge space on a fixed scroll end plate, this discharge muffler is attached to a shell, and the discharge muffler is fitted into a protrusion formed on the fixed scroll end plate. , an annular groove is formed in one of the discharge muffler or the protrusion on this fitting surface, the wall surface of this annular groove on the side opposite to the discharge space is a tapered surface, and a seal ring is attached to the annular groove so as to be in close contact with this tapered surface. This is what I did.

[Effect]

In this invention, by forming a discharge muffler on the fixed scroll end plate, it is possible to attenuate the discharge pulsation and prevent abnormal pressure rise during sleep startup. When the muffler is fitted, the wall surface of the anti-discharge space of the annular groove formed on the fitting surface is made into a tapered surface, and a seal ring that is in close contact with the tapered surface is attached to the annular groove. The seal ring is pressed by the high pressure gas, and the tapered surface brings the seal ring into close contact with the fitting surface to provide a seal.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the scroll compressor of this invention, in which 20 is a discharge muffler installed to cover the discharge hole 6 of the fixed scroll end plate 1a;
20a is a fitting surface between the discharge muffler 20 and the fixed scroll end plate 1a, and 20b is a sealing welded portion that fixes the discharge muffler 20 to the upper shell 13. 21 is a discharge space between the discharge muffler 20 and the fixed scroll end plate 1a, 22 is a seal ring on the joint surface 20a, and 23 is an oil reservoir provided in the discharge space 21 and communicating with the fitting surface 20a. Note that other symbols are the same as those of the conventional scroll compressor shown in FIG.

In the scroll compressor of this invention configured as described above, the discharge space 21 has a sufficiently large volume, and the discharge muffler 20 can effectively attenuate discharge pressure pulsations. In addition, even if the liquid refrigerant etc. lying in the lower shell 12 is sucked by the suction hole 5 and passes through the discharge hole 6 and flows into the discharge space 21 during sleep startup, this discharge space 21
The discharge muffler 20 replaces the accumulator.
This prevents a large amount of liquid from being discharged at once to the discharge pipe 7 attached to the pump, prevents abnormal pressure rise due to temporary liquid clogging, and prevents startup failures. Moreover, the discharge muffler 20 has an upper shell 13.
It is simply fixed by welding to the fixed scroll end plate 1a and is simply fitted into the fixed scroll end plate 1a in a free state, and no fastening means using bolts is required. Furthermore, a portion of the discharge muffler 20 is exposed outside the upper shell 13, and the discharge pipe 7 is conducted from this exposed portion to the outside of the compressor, so that assembly can be easily performed. Further, since the discharge muffler 20 and the fixed scroll end plate 1a are freely fitted, even if the discharge muffler 20 tries to displace in the axial direction (upward) due to high pressure in the discharge space 21, for example, the fixed scroll end plate 1a It will not be distorted or deformed.

By the way, at the fitting surface 20a of the discharge muffler 20 with the fixed scroll end plate 1a as described above, the discharge space 21 and the low pressure space 1 in the shell are effectively separated.
6, and a seal ring 22 is provided within the fitting surface 20a. In order to further enhance the sealing effect of the seal ring 22, an oil reservoir 23 is provided in the discharge space 21 so as to communicate with the fitting surface 20a. 1st
In the figure, a concentric recess 23a is formed in the surface of the fixed scroll end plate 1a, into which the discharge muffler 20 is fitted, and the outer surface and the inner surface of the recess form a fitting surface 20a. As explained in the conventional example of FIG. 6, after the oil 15 at the bottom of the lower shell 12 is used for lubrication as shown by the broken line arrow, a part of it is sucked into the suction chamber 4 together with the gas (solid line arrow), and the oil 15 is sucked into the discharge space. The gas is separated from the gas in the compressor 21, and the gas is discharged to the outside of the compressor from the discharge pipe 7, and the oil continuously accumulates in the oil reservoir 23. Then, the discharge space 21 and the shell inner space 16 are oil-tightly sealed. Therefore, the seal ring 22
Even if it is not a perfect sealing means, it may be a relatively simple means that allows some leakage. When such a seal ring 22 is used, oil continuously leaks from the joint surface 20a into the shell inner space 16 little by little.
In this way, the fitting surface 20a effectively separates the oil that has mixed into the discharged gas and is about to be discharged outside the compressor.
Can be used for stickers.

FIG. 2 shows an embodiment of the discharge muffler 20, in which the manner in which the discharge muffler 20 and the fixed scroll end plate 1a are fitted is reversed. That is, in this example, a cylindrical protrusion 1c is provided on the fixed scroll end plate 1a, and a fitting surface 2 is provided on the inner surface of the discharge muffler 20.
Fitted at 0a. Then, a recess 23a is provided on the outer peripheral side of the protrusion 1c to serve as an oil reservoir 23, and
An oil reservoir 23 communicates with the fitting surface 20a.

Next, an example of the seal ring 22 used in the discharge muffler 20 will be explained with reference to FIGS. 3 to 5. FIG. 3 is a perspective view of the seal ring 22, FIG. 4 is an enlarged sectional view of a portion of the seal ring, and FIG. 5 is a partial sectional view when the seal ring 22 is used in a discharge muffler 20 of a compressor. The seal ring 22 is a trapezoidal ring having a tapered surface 22a on the inner peripheral surface, and when the scroll compressor is used as a refrigerant compressor, the material is a refrigerant-resistant resin, especially
PTFE is better. Then, the tapered surface 22a and the outer peripheral surface 2
2b becomes the sealing surface. Here, seal ring 2
2 will be explained with reference to FIG. 1d is a cylindrical groove formed in the discharge muffler fitting surface 20a of the protrusion 1c of the fixed scroll end plate 1a, and by sandwiching this groove 1d, the protrusion 1c connects the side surface 1f of diameter _D1 to the discharge space 21. On the side, side part 1g with diameter D ₂
are respectively formed on the shell inner space 16 side, and D ₁ <
It is listed as D ₂ . Further, a tapered surface 1e is formed on the side surface 1g side of the groove 1d. With the above configuration, the discharge space 21 and the low pressure space 1 in the shell
The seal ring 22 is evenly pressed in the direction of arrow B by the differential pressure of 6. As a result, the tapered surface 22a
is pressed against the tapered surface 1e of the groove 1d while moving slightly in the direction of arrow C, and the outer peripheral surface 22b is pressed against the fitting surface 20a and sealed. At this time, the oil in the oil reservoir 23 can further enhance the sealing effect.

[Effect of idea]

As described above, according to this invention, a discharge muffler that forms a discharge space so as to cover the discharge hole is provided on the opposite side of the end plate of the fixed scroll to the side on which the spiral side plate is formed, and a protrusion on the fixed scroll end plate is provided. A discharge muffler is fitted to the fitting surface, the annular groove side provided on either side of this fitting surface is made into a tapered surface, and the seal ring is attached to the annular groove so as to be in close contact with this tapered surface. The seal ring comes into close contact with the seal ring, allowing for effective sealing. This results in a highly reliable and inexpensive scroll compressor that does not leak oil.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a scroll compressor according to an embodiment of the invention, Fig. 2 is a sectional view of main parts showing another configuration of the discharge muffler, and Figs. 3 and 4 are perspective views of the sealing means. FIG. 5 is a sectional view of a main part of a seal means mounting structure, and FIG. 6 is a sectional view of a conventional scroll compressor. 1... Fixed scroll, 1a... Fixed scroll end face, 2... Oscillating scroll, 3... Compression chamber,
5...Suction hole, 6...Discharge hole, 8a...Oil return hole,
9... Main shaft, 10... Electric motor, 11... Oil pump, 12... Lower shell, 13... Upper shell, 15... Oil, 16... Shell inner space, 20
...Discharge muffler, 20a... Fitting surface, 21...
...Discharge space, 22...Seal ring, 23...Oil reservoir portion. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A fixed scroll and an oscillating scroll that form a compressor by having spiral side plates such as involutes protruding from the end plate surface and combining the side plates eccentrically with each other, and a driving means for driving the oscillating scroll. oil for lubricating the driving means, and a discharge hole for discharging working fluid to the fixed scroll end plate;
In a scroll compressor equipped with a fixed scroll, an oscillating scroll, and a shell for housing a driving means, a discharge space is formed on a surface of the end plate of the fixed scroll opposite to the surface on which the spiral side plate is formed so as to cover the discharge hole. A discharge muffler is provided, the discharge muffler is attached to the shell, a cylindrical protrusion is provided on the fixed scroll end plate, the discharge muffler is fitted to the protrusion, and the discharge muffler or the protrusion is attached to the fitting surface. An annular groove is formed in either one of the annular grooves, the side wall surface of the annular groove on the side opposite to the discharge space is a tapered surface, and a seal ring having the same tapered surface is attached to the annular groove so as to be in close contact with the tapered surface. A scroll compressor featuring: