KR0156882B1 - Scroll type compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, wherein the outer surface 15a of the swing scroll 14 end plate 15 and the sliding surface of the thrust plain bearing 36 in contact therewith upon restarting after a prolonged stop of the compressor. An object of the present invention is to provide a compressor that can prevent abnormal abrasion and seizure of 36a). In the configuration, the outer surface 15a of the end plate 15 of the turning scroll 14 and the thrust contacting the same are provided. At least one of the sliding surface 36a of the plain bearing 36 is coated with a solid lubricant coating film 40.

Description

Scroll compressor

1 shows a first embodiment of the invention,

(a) is a longitudinal cross-sectional view of a scroll compressor.

(b) is a front view of a thrust plain bearing.

(c) is sectional drawing along the C-C line | wire of (b).

(d) is a partially enlarged cross-sectional view showing a modification.

(e) Partial enlarged cross-sectional view showing another variation.

2 shows a second embodiment of the present invention,

(a) is a longitudinal cross-sectional view of a scroll compressor.

(b) is a partially enlarged cross-sectional view.

(c) is a partially enlarged cross-sectional view showing a modification.

(d) is a partially enlarged cross-sectional view showing another modification.

3 is a longitudinal sectional view of a conventional scroll compressor.

* Explanation of symbols for main parts of the drawings

1: sealed housing 2: cup-shaped body

4: Front End Plate 4a: Thrust Side

10: fixed scroll 14: turning scroll

15: veneer 15a: outer surface

36: thrust plain bearing 36a: sliding surface

40: coating film

The present invention relates to a scroll compressor.

An example of a conventional scroll compressor is shown in FIG.

In Fig. 3, reference numeral 1 denotes a sealed housing in which a cup-shaped body 2, a front end plate 4 fastened by bolts 3, and a boat 5 fastened thereto. It consists of a cylindrical member 6. The rotating shaft 7 which penetrates this cylindrical member 6 is rotatably supported by the sealed housing 1 through the bearings 8 and 9.

In the sealed housing 1, a fixed scroll 10 and a turning scroll 14 are incorporated.

The fixed scroll (10) has a end plate (11) and a spiral wrap (12) formed on its inner surface, and the end plate (11) is attached to the cup-shaped body (2) by bolts (13). By fastening, the fixed scroll 10 is fixed in the housing 1.

The inside of the housing 1 is partitioned by sealing the outer circumferential surface of the end plate 11 and the inner circumferential surface of the cup-shaped body 2, and the discharge cavity 31 is formed outside the end plate 11, and the inside of the end plate 11 is formed. The suction chamber 28 is limited. Moreover, the discharge port 29 is formed in the center of the end plate 11, and this discharge port 29 is opened and closed by the discharge valve 30. As shown in FIG.

The swinging scroll 14 has a end plate 15 and a spiral wrap 16 formed on its inner surface, and the spiral wrap 16 is substantially the same as the spiral wrap 12 of the fixed scroll 10. It has dimensions and shapes.

The turning scroll 14 and the fixed scroll 10 are eccentric by the mutual revolving radius, and are engaged as shown by shifting the angle by 180 degrees. In this way, the tip seal 17 embedded in the tip end surface of the spiral wrap 12 is close to the inner surface of the end plate 15, and the tip seal 18 embedded in the tip end surface of the spiral wrap 16 is the end plate. A plurality of compression chambers 19a and 19b which are in close contact with the inner surface of (11) and whose side surfaces of the vortex wraps 12 and 16 are in line contact at a plurality of places and are approximately point symmetrical with respect to the center of the vortex are formed. The vane 22 is formed in the center of the vortex.

In the interior of the cylindrical boss 20 protruding from the center of the outer surface of the end plate 15, a drive bush 21 is mounted to rotate freely via a pivoting bearing 23, and a slide formed in the drive bush 21 is provided. In the hole 24, an eccentric drive pin 25 projecting from the inner end of the rotating shaft 7 is slidably fitted. The drive bush 21 is equipped with a balance wight 27 for balancing the dynamic imbalance caused by the orbiting revolution of the turning scroll.

In addition, (26) allows the swinging movement of the swinging scroll (14), but the rotation support base made of Oldham Link to prevent the rotation, (36) the thrust plain bearing, (37) on the rotary shaft (7) It is a fixed counterweight.

In this way, when the rotating shaft 7 is rotated, the turning scroll 14 is driven through the turning drive mechanism which consists of the eccentric drive pin 25, the drive bushing 21, the boss 20, etc., and the turning scroll 14 Is rotated by the rotation stopping mechanism 26, orbiting the orbit around the orbital turning radius, that is, the radius of the eccentricity of the rotary shaft 7 and the eccentric driving pin 25 as a radius.

Then, the line contact portions on the side surfaces of the spiral wraps 12 and 16 gradually move toward the center of the swirl.

Accordingly, gas introduced into the suction chamber 28 through the suction port, not shown in the drawing, is introduced into the angular compression chambers 19a and 19b from the outer end openings of the spiral wraps 12 and 16. While being compressed, it reaches the center chamber 22, and from this, it passes through the discharge port 29, presses and opens the discharge valve 30, discharges it to the discharge cavity 31, and flows out through the discharge port which is not shown from here.

The thrust load acts on the turning scroll 14 by the compressed gas in the compressors 19a and 19b. This thrust load is a thrust receiving surface formed on the inner end surface of the front end plate 4 via a thrust plain bearing 36 in contact with the outer peripheral edge of the outer surface 15a of the end plate 15 of the turning scroll 14. Supported by (4a).

The thrust plain bearing 36 is made of thin steel plate made of SK material, etc., and is placed on the inner end surface of the front end plate to prevent the rotation thereof. It is not to turn with the

In the conventional scroll compressor, the outer surface 15a of the end plate 15 of the turning scroll 14 and the sliding surface of the thrust plain bearing 36 in contact with the rotating plate 14 are placed on the gas refrigerant sucked into the suction chamber 28. It is lubricated by the mist of lubricant contained.

Therefore, if the compressor is stopped for a long time, the refrigerant liquid infiltrates into the sealed housing 1, and the refrigerant liquid gradually dilutes the lubricating oil. Therefore, the sliding surface of the thrust plane bearing 36 is not lubricated at the start of the compressor. When operating in a state, that is, dry operation may occur.

After the compressor is started, it takes some time (e.g., several seconds) until the sliding surface of the thruster plain bearing 36 is lubricated by the mist of lubricating oil contained in the suction gas refrigerant. In the meantime, the dry operation may cause an accident such as the thrust plane bearing 36 being pressed, which may damage the reliability of the compressor.

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and the gist of the first aspect of the present invention is to rotate the rotating scroll engaged with the fixed scroll fixed in the closed housing while preventing the rotation of the rotating scroll and simultaneously rotating the rotating scroll. In a scroll compressor comprising a thrust load acting on a thrust plane bearing which slides with an outer surface of a single plate of a revolving scroll, by a thrust receiving surface of the hermetic housing, the outer surface of the single plate of the rotating scroll and There is provided a scroll compressor, wherein a coating film of a solid lubricant is applied to at least one of the sliding surfaces of the thrust plane bearing in contact with this.

The gist of the second aspect of the present invention is that the rotating scroll engaged with the fixed scroll fixed in the sealed housing prevents the rotation of the rotating scroll and the thrust load acting on the rotating scroll to the outside of the end plate of the rotating scroll. A scroll compressor, which is supported by a thrusting surface of the hermetic housing in contact with a surface, wherein the scroll lubricant is coated with a solid lubricant on at least one of the outer surface of the end plate of the turning scroll and the thrusting surface. It is in the mold compressor.

As the solid lubricant, a solid lubricant based on ethylene tetrafluoride resin can be used.

In the first aspect of the invention, the coating film of the solid lubricant has excellent wear resistance and lubricity even under poor lubricating conditions. Therefore, the outer surface of the end plate of the turning scroll and the dry running mileage at the time of restarting after the compressor is stopped for a long time. Abnormal abrasion and seizure of the sliding surface of the thrust plain bearing in contact with this can be prevented.

In the second aspect of the invention, abnormal abrasion and sticking of the outer surface of the end plate of the turning scroll and the thrust surface in contact with this at the time of restarting after the long-term stop of the compressor can be prevented.

A first embodiment of the invention is shown in FIG.

As shown in Figs. 1 (a), (b), and (c), the sliding surface 36a of the thrust plain bearing 36 has a solid lubricant based on PTFE [tetrafluoroethylene resin (trade name Teflon)]. The coating film 40 is implemented by coating and baking.

In addition, as shown in (d), the same coating film 40 can be applied on the outer surface 15a of the end plate 15 of the turning scroll 14, and as shown in (e). Similarly, the same coating film 40 can be applied to both the sliding surface 36a of the thrust plane bearing 36 and the outer surface 15a of the end plate 15 of the revolving scroll 14.

Since the coating film 40 has poor lubricating oil condition and excellent lubrication resistance and lubricity even under the condition that the lubricating oil film is not formed, a few hours (for example, several seconds) upon restarting the compressor after a long stop. Even if the sliding surface 36a and the outer surface 15a become dry driving or dry driving, these abnormal wear and seizure can be prevented.

The solid lubricant may be a solid lubricant having a base material other than PTFE as long as the material is excellent in wear resistance and lubricity.

The other structure and operation are the same as the conventional one shown in Fig. 3, and the corresponding members are assigned the same reference numerals.

A second embodiment of the invention is shown in FIG.

In this second embodiment, as shown in (a), the outside of the end plate 15 of the turning scroll 14 on the inner end surface of the front end plate 4, that is, the thrust surface 4a. The surface 15a is directly sliding.

As shown in (b), the coating film 40 is applied to the thrusted surface 4a by applying and firing a solid lubricant based on PTFE [tetrafluoroethylene resin (trade name Teflon)].

In addition, as shown in (c), on the outer surface 15a of the end plate 15 of the turning scroll 14, or as shown in (d), the thrust surface 4a and the turning scroll 14 are shown. The coating film 40 can also be given to both the outer surfaces 15a of the end plate 15 of ().

Since the coating film 40 has poor lubricating oil condition and excellent lubrication resistance and lubricity even under the condition that the lubricating oil film is not formed, the outer surface 15a of the end plate 15 and the restarted part after restarting the compressor for a long time. Even if the sliding surface with the thrust receiving surface 14a becomes dry running or dry running, it does not lead to lubrication failure, and abnormal wear and sticking of these sliding surfaces can be prevented.

In addition, both the front end plate 4 and the swinging scroll 14 are made of aluminum, and the thrust face 4a of the front end plate 4 is not interposed between the thrust plain bearings 36. And the outer surface 15a of the end plate 15 of the revolving scroll 14 can be brought into contact with each other, thereby contributing to the reduction of the weight and the cost of the compressor.

In the first aspect of the invention, since one or both of the outer surface of the end plate of the swinging scroll or the sliding surface of the thrust plane bearing in contact with this is coated with a solid lubricant, slightly during restart of the compressor after a long stop. Even if it is time dry operation or dry operation, it is possible to prevent abnormal abrasion or sticking of the outer surface of the end plate of the turning scroll and the sliding surface of the thrust plain bearing in contact with this, thereby improving the reliability of the compressor.

In the second invention, since the coating film of the solid lubricant is applied to one or both of the outer surface, the thrust face, or the thrust plate of the swinging scroll, the swinging at the time of restarting the compressor after long-term stop like the first invention. Abnormal abrasion and seizure of the outer surface of the end plate of the scroll and the thrust side can be prevented, and both the rotating scroll and the sealed housing can be made of aluminum, and the thrust plane bearing can be omitted, thereby making the compressor lightweight and its Cost reduction is possible.

Claims (3)

The rotating scroll engaged with the fixed scroll fixed in the airtight housing prevents the rotation of the rotating scroll and the thrust load acting on the rotating scroll through the thrust plain bearing contacting the outer surface of the end plate of the rotating scroll. A scroll compressor, which is supported by a thrusting surface of a hermetic housing, wherein a coating film of a solid lubricant is applied to at least one of an outer surface of the end plate of the swing scroll and a sliding surface of the thrust plain bearing in contact with the thrust scroll bearing. Scroll compressor. The thrusting surface of the hermetic housing which contacts the outer surface of the end plate of the turning scroll while simultaneously rotating the rotating scroll engaged with the fixed scroll fixed in the closed housing while preventing its rotation. A scroll compressor, which is supported by a roller, characterized in that a coating film of a solid lubricant is applied to at least one of the outer surface of the end plate of the swing scroll and the thrust receiving surface. The scroll compressor according to claim 1 or 2, wherein a solid lubricant based on ethylene tetrafluoride resin is used as the solid lubricant.