JPS5932687A - Scroll compressor - Google Patents

Abstract

PURPOSE:To reduce a bearing loss and decrease the temperature of the bearing by a method wherein a part of the surface of the bearing, which is corresponding to the opposite side of the load of the journal bearing supporting a crank shaft in the radial direction thereof, is cut out. CONSTITUTION:The part 6a, corresponding to the opposite side of the load of the crank shaft, is notched in the sliding part between the crank shaft 6 and a main shaft liner 8. The notched part 6a is located at the opposite side of a pressure distribution P on the bearing, which is generated by a resultant force F applied to the main bearing liner 8 from the swinging scroll 2. Accordingly, a distance between the part of the shaft, which is corresponding to the opposite side of the load of the journal bearing and sliding on the bearing, and the bearing may be widened at all times, therefore, shearing force of the film of the oil, due to a relative slip between two surfaces, may be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to two improvements in thrust bearings in scroll compressors. Figure 1 (aJ, (b),
(c).

(d) shows the basic components and operating principle of a scroll compressor. ．． In these figures, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a discharge port, 4 is a compression chamber, 0 is a fixed point on the fixed scroll, and o't=:t is a fixed point on an oscillating scroll. The fixed scroll 1 and the oscillating scroll 2 have the same shape and spiral spirals with opposite winding directions, and their shape is, as is known from the past, a combination of involutes, circular arcs, etc. It is something.

Next, the operation will be explained. Figure 1 (a), (b), (
C), (dl, the fixed scroll 1 is stationary with respect to space, ldυ, the swinging scroll 2 is combined with the fixed scroll 1 as shown in the figure, and rotates without changing its attitude with respect to space. The first stage does not perform any movement, that is, rocking.
), (b), (,l, 0 shown in (d)
', 90'', 180°, 270°
Good luck mυ. Accompanying the swinging of the swinging scroll 2,
The crescent-shaped compression chamber 4 formed between the volute of the fixed scroll 1 and the volute of the oscillating scroll 2 is sequentially shown in its diagram O to 0.
' distance is kept constant and 1lj9. If the interval between turns is 8 and IW is also expressed, oo'='t. The colors correspond to the pitch of the spiral.

The outline of the device known as a scroll compressor is as above, and now the specific structure and operation of the scroll compressor will be explained. In other words, Figure 2 shows Suff 1. ff
For example, a compressor is configured as a compressor for a gas such as 70I, and is a closed type. It has a form (・ru.

In the figure, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a 1 out 0.4 is a compression chamber, 5 is a boss part of an oscillating scroll 2, 6 is a crankshaft, 7 is an oscillating scroll all+
8 is the main bearing liner.

9 is a bearing support, 10 is an Oldham joint, 11 is a motor rotor, 12 is a motor stator, 13 is a first balance, 14
is the second balance, 15 is the suction port, and 16 is the shell.

The following are the main components, and the shell 16 includes t[
! The IIr machine stator 12 is fixed by press fitting or bolting. At the upper end of the shell 16.

The bearing support 11 is fixed by bolting or press-fitting, and the main bearing liner 8 is press-fitted into the bearing support 9.
6 is supported. In addition, there is an oscillating scroll bearing life f in an eccentric position V to the head of the crank LTL+6.
The host portion 5 of the swinging scroll 2 is inserted through the hole 7. A fixed scroll 1 having a discharge port 3 is fitted into the oscillating scroll 2.
is fixed to the bearing support 9 by bolting/f, etc. Also 1w1 moving space/) roll 2t 11111 support 9
An Oldham joint 10 is connected between the scroll and the scroll, which allows the swinging scroll to perform a revolving motion without rotating on its axis. Further, an electric motor rotor 11 is press-fitted onto the crankshaft 6, and the ten end portion of the rotor 11 is cleaned.

A first balance 13 for statically balancing the swinging scroll 2 is attached by bolting or the like. In addition, a second balance 14 for dynamic balance is attached to the lower end, and as the motor rotates, the centrifugal force F1 is applied to the eccentric weight of the motor, and the centrifugal force F1 is taken into the compression chamber 4. Since the crankshaft 6 inserted into the eccentric hole in the head of the swinging scroll post section 50 receives the force F due to the gas pressure of the fluid, the crankshaft 6 receives the resultant force F. As can be seen from the relationship between 0° and 270' in Figure 1, the direction of the centrifugal force B and the direction of the force I due to gas pressure are always at a constant angle (if the vortex is reverse spiral, the direction of the force due to gas pressure is are symmetrical with respect to the direction of centrifugal force), the resultant force F that the crankshaft 6 receives is generated in a constant direction with respect to the eccentric hole.

In the conventional scroll compressor as described above,
) The journal bearing, which is the support mechanism for the moon 10, consists of a cylindrical shaft and a bearing, just like those used in general rotating machinery, and the clearance between them is approximately 171,000 mm. It is quite small, and the two planes touch with a slight inclination at the bearing K or the bearing load area.By doing this, the oil film interposed between the two planes forms a wedge shape, and the two planes [7] The heavy sliding creates pressure on the oil film, on which the shaft can float, thus avoiding solid contact with the bearing.

The reason why the shaft and bearing are made into a cylindrical shape is that the geometrical relationship between the two planes described above is kept constant on the load side of the bearing regardless of the direction of the load applied to the bearing in response to rotational movement of the shaft. This is to maintain the oil film. However, due to the above-mentioned bearing function, that is, due to the pressure generated in the rust oil film that exists between the bearing and the shaft due to the rotational movement of the shaft,
It has the function of floating the shaft on the oil film (・Front surface is only the bearing load jFI11, and the two planes corresponding to the anti-load side do not have this bearing function at all (・In fact, as mentioned above, The river 11 and the bearing have a cylindrical shape, and the clearance between them is small, causing unnecessary shearing force on the oil film, resulting in large bearing losses.Furthermore, on the anti-load side of the bearing, unnecessary shearing force is applied to the oil film. As a result, the heat generated by shearing the oil film raises the bearing temperature and lowers the viscosity of the oil, which in turn causes a risk of damage to the bearing due to a decrease in the thickness of the oil film.

The present invention has been made to eliminate the above-mentioned drawbacks, and the main parts of one embodiment are shown in FIGS. 3(a) and 3(b).
.

(As shown in c+. As shown in these figures, the portion 6n corresponding to the anti-load side of the crankshaft in the sliding part between the crankshaft 6 and the upper shaft liner shortage≦, that is, the swing!F, lJ scroll 2
62 force f between the centrifugal cuff 1 and the debris due to gas pressure
The direction J is opposite 11) The sliding surface of u was cut out. This notch 61. Figure 4 (rel, (b), (→, (d)
) shown in 6 (Uni, Ei,, E lf'lb receiving liner 8
is always opposite to the pressure distribution a on the bearing caused by the mating cover which the oscillating scroll 2 receives.

In this case, the distance between the shaft and the bearing sliding part corresponding to the anti-load side of the journal bearing is 1 J, and the distance between the shaft and the bearing can always be widened, and the phase 7 of the two sides C4J is Since the shear deflection of the oil film is reduced, the bearing (1 (loss is (υ)
2D, furthermore, as the shearing force of the oil film decreases, the heat generated by J- also decreases, so the bearing temperature decreases compared to conventional bearings, increasing the viscosity of the oil, which in turn increases the thickness of the oil film.
+ Damage the party and leave. Also, the negative 6r 1 of the crankshaft
1111, Fig. 4 (aJ, (bJ, (
c) , (As shown in dl, the conventional cylindrical shape is changed, so a constant wedge oil film can always be maintained between the bearing and the bearing.

℃, scroll compressor journal bearings reduce I11+ bearing losses without losing bearing function.

In addition, bearing reliability can be completely improved.

FIGS. 5(-), (b), and (c) show other embodiments of the present invention.

These figures focus on the other journal bearing part of the crankshaft 6, namely the oscillating scroll boss part 5 and the oscillating scroll bearing liner 7, and the oscillating scroll inserted into the eccentric hole in the head of the crankshaft 6. Anti-load side 7 of bearing liner 7
a, that is, the sliding portion on the opposite side to the direction of the mating cuff that occurs in the swinging scroll 2 described in the previous example is cut out. As shown in FIG. 6, this notch 7A is always on the opposite side from the pressure distribution 7 generated by the resultant force 1 that the oscillating scroll bearing liner 7 receives from the oscillating scroll 2 as the crankshaft rotates. In this way, the distance between the shaft of the portion corresponding to the anti-load side of the rocking scroll bearing Lightia and the construction surface of the bearing can be constantly widened, and the same effect as described above can be obtained.

As described above, in the present invention, in the journal bearing sliding part of the crankshaft of a scroll compressor, the bearing surface or the shaft sliding surface corresponding to the side opposite to the load direction accompanying rotational movement of the shaft is cut out. By always keeping the construction surface pressure S on the opposite load side wide, the bearing loss is small, and furthermore, bearing loss is reduced and the υ bearing temperature is lowered, resulting in high bearing reliability. It is possible to provide a scroll compressor having a supporting function, that is, a function of always maintaining a wedge oil film between the cylindrical shaft and the bearing and supporting the shaft on the oil film.

[Brief explanation of drawings]

Figures 1 (a), (b), (e), and (d) show different operating states of the scroll compressor. Principle and vector diagram of force acting on the oscillating scroll, 2nd
The figure is a vertical cross-sectional view showing a conventional scroll compressor, and Figure 3 (
a). (b) and (c) are a perspective view of a crankshaft showing an embodiment of the present invention, a plan view with a vector diagram, and a partially sectional front view; , (
d) is an explanatory view of the operation of the crankshaft of one embodiment showing different states; FIGS. 5(!1), (b) and (C) are perspective views of the crankshaft showing other embodiments of the present invention; A plan view with a vector diagram, a partially cutaway front view, and FIG. 6 are explanatory views of the operation of the crankshaft of another embodiment. Note that the same reference numerals in the figures indicate the same or corresponding parts. 2... Oscillating scroll wheel, 5... Oscillating scroll boss portion, 6... Crankshaft, 5a... Notch portion, 7...
Oscillating scroll bearing, 7a... Notch, 8... Main bearing liner. Agent Makoto Kuzuno - (1 other person) Spear 4 Diagram (U) Cd) Procedures Amendment W) (Voluntary) 'I-1 Administrative Agency Director T4'h', 'h Kidney 1, Small I'I Table 51< Patent Application Sho 57-14
1427 No. 12, Seimei's 8th name Scroll compressor knee 3 Sode II; Go, -4-ru right thing ('l relationship with f-i'it'r 19t1 person Address East r + j Miyakochiyo IH Ward Marunouchi- :,
]' t, No. 42: 3, P5 people (6, (60, 1)
2: Hishitonki Co., Ltd. Representative Katayuni 8th Department, 10th Agent I1mi Location: 1-1 Kunouchi 2-chome, Chiyo 1-11 Ward, East East No. 2; 3 Bow - (1) Invention of the invention in the specification Detailed Description Column 6, Contents of Correction (1) On page 2, line 19 of the specification, r 00'='t J is corrected to r 00'=-'-t J. (2) In lines 17 and 19 of No. 5, the words "construction side" are amended to read "two sides." (3) On page 6, lines 5 and 11, the words "2,000 faces" are amended to read "two faces." (4) Page 6, lines 11 to 13, ``Not only does it not have it at all, but as mentioned above, the shaft and bearing are cylindrical, and the clearance between A and A is small.'' On the contrary, the clearance was so small that it caused an oil slick.'' (5) On page 7, lines 11 and 12, "distance between construction surfaces" is corrected to "distance between two surfaces." (6) On page 8, line 17, "distance between construction surfaces" is corrected to "distance between two surfaces." (7) No. 91 (line 3, “Construction surface distance” is replaced with “21
Correct it as ``distance between surfaces''. (8) Correct as shown in drawings J, f'h + attached sheet. t11! ! 2 (a-) θ'(t) \pa b)/θ-(e)7 1 to m-

Claims (1)

[Claims] By combining a plurality of spirals and combining them with each other, υ, a fixed scroll and an oscillating scroll that form a compression chamber between the two volutes, and a oscillating motion of the oscillating scroll to form a compression chamber. a drive mechanism that compresses the fluid by sucking fluid into it, a crankshaft that is connected to the oscillating scroll and transmits the rotational motion of the mill υ machine, and a journal bearing that supports this crankshaft in the radial direction. A scroll compressor characterized in that a bearing surface or a shaft sliding surface corresponding to the anti-load side of the jar pull bearing is partially cut out.