CN1566672A - Device for decreasing thrust surface friction for hermetic compressor - Google Patents

Abstract

The invention relates to a thrust surface friction reducing device of closed type compressor, comprising a cylinder, a rotating shaft, an upper and a lower bearing plate, a dividing plate and blades. The cylinder has a inner space capable of forming upper and lower opening of the compressing chamber, The rotating shaft is linked to the rotor of driving engine through the inner space of the cylinder; the upper and lower bearing plate is connected to the upper and lower opening of the cylinder, comprising an inner space with the cylinder; the dividing plate is connected on the rotating shaft dividing the cylinder into two compressing chamber; the blades are connected on the bearing plates for compressing and discharging fluid. It also comprises an advance ball bearing which is inserted into the thrust bearing surface of the upper and lower bearing supporting the rotating shaft. So the invention can reduce the abrasion of bearing plate and rotating shaft and noise.

Description

The device that reduces thrust surface friction of hermetic type compressor

Technical field

The present invention relates to hermetic type compressor, relate in particular to the device that reduces thrust surface friction of hermetic type compressor.

Background technique

In general, the working method of vane compressor is: it is attached on the solid of rotation blade under the effect of pressure, thereby the inner space of cylinder is divided into suction zone and constricted zone.And make the solid of rotation rotation in this state, thereby above-mentioned suction zone and constricted zone are exchanged continuously, thereby realize the process of suction, compression and the discharge of convection cell.

Fig. 1 is the longitdinal cross-section diagram of an example of existing blade (vane) formula compressor.

As shown in the figure, existing blade type hermetic type compressor is made of electric structure portion and compression structure part, and wherein electric structure portion is installed in the inside of casing (1), can produce power; Compression structure part is connected in the electric structure portion, fluid can be sucked, compresses and discharges.

Compression structure part is made of cylinder (2), top bearing plate (3A), bottom bearing plate (3B), running shaft (4), dividing plate (5), the 1st blade (6A), the 2nd blade (6B), support spring (7), top baffler, bottom baffler; Cylinder (2), it possesses and is used for sucking and the inner space (V) of compression refrigerant gas, and it is installed in the Lower Half of casing (1); Top bearing plate (3A) and bottom bearing plate (3B), they be connected to the top of cylinder (2) and below, thereby constituted cylinder assembly with cylinder; Running shaft (4), it is connected on the rotor (not shown) of electric structure portion, meanwhile, also run through each bearing plate (3A, 3B) and be connected with them, thereby it can conduct the power of electric structure portion to compression structure part; Dividing plate (5), it is connected running shaft (4) and upward or with running shaft becomes one, in order to be divided into the 1st pressing chamber (S1) and the 2nd pressing chamber (S2) to the inner space of cylinder (2) (V), it is the sine wave shape that possesses bending point on upper and lower surfaces respectively; The 1st blade (6A) and the 2nd blade (6B), their top and bottom can contact respectively on two faces of dividing plate (5), thereby can be when running shaft (4) rotates each pressing chamber (S1) (S2) are divided into and suck zone and discharging area; Support spring (7) (bearing spring), it can (6B) give elastic support from two ends to each blade (6A); Top baffler (not shown) and bottom baffler (not shown), they are installed in respectively on the outer surface of top bearing plate (3A) and bottom bearing plate (3B), can reduce the discharge noise of the pressurized gas of (S2) discharging from each pressing chamber (S1).

Bearing plate (3A) (3B) is the disc-shape of the top and bottom that can cover cylinder (2), and by thrust bearing portion (3a) (3a) and radial bearing portion (3b) (3b) constitute, wherein above-mentioned thrust bearing portion can give axial sliding support to the extension (4b) of following running shaft (4); Be formed centrally the axis hole that running shaft (4) is passed in the above-mentioned radial bearing portion, it can give the support of radial direction to the axial region (4a) of following running shaft (4) and it can be rotated.

Running shaft (4) is made of axial region (4a) and extension (4b), and its middle shaft part (4a) is inserted in the axis hole of upper and lower bearing plate (3A), (3B), is subjected to the support of radial bearing portion (3b) radial direction (3b); Extension (4b) expands outwardly at lower half portion upper edge of axial region (4a) radial direction and forms, dividing plate (5) one or assembling was got on is afterwards with it arranged on its outer surface, and their support is gone up and be subjected in the thrust bearing portion (3a) that its upper and lower two faces are shelved on above-mentioned upper and lower bearing plate (3A), (3B) (3a).

For the center that makes extension (4b) and the axle center of axial region (4a) are consistent, it keeps concentric from plane projection and axial region (4a).And extension (4b) is with dividing plate (5) is the identical symmetric shape of diameter of upper and lower both sides, center.

The symbol r1 that does not do explanation among the figure is thrust supporting surface radially, and r2 is the thrust bearing face, and SP is a suction pipe.

Have a look the course of action of aforesaid existing vane compressor below.

If connect power supply in electric structure portion, thereby make the rotation of rotor (not shown), being connected epitrochanterian running shaft (4) so will rotate according to a certain direction with dividing plate (5); Thereupon, the blade (6A, 6B) that contacts respectively on the above and below of dividing plate (5) can move towards opposite direction up and down along with the height variation of dividing plate (5), thereby the 1st pressing chamber (S1) of cylinder (2) and the volume of the 2nd pressing chamber (S2) are changed.Meanwhile, can constantly there be new cold media air to be attracted to the 1st compression type (S1) and the 2nd pressing chamber (S2) by the suction pipe (SP) that is positioned at cylinder (2) one sides, these cold media air are along with the rotation of dividing plate (5) can be compressed gradually, protrusion curved face part from the both sides of dividing plate (5) moment of arriving the beginning discharge point begins to through till the moment of each exhaust port (not shown) then, and cold media air can replace and pass through each exhaust port discharge.

At this moment, (promptly radially thrust supporting surface) is (r1) corresponding because (3B) axis hole of the axial region (4a) of running shaft (4) and upper and lower bearing plate (3A), be subjected to support along radial direction, on the other hand, extension (4b) is then (r2) corresponding with upper and lower bearing plate (3A) plane (being the thrust bearing face) (3B), be subjected to support axially, so running shaft can keep stably continuing rotation.

But in aforesaid existing vane compressor, running shaft (4) is in the process of rotation, and axial region (4a) and extension (4b) can be respectively (3b) apply load with thrust bearing portion (3a) on (3a) in upper and lower bearing plate (3A) radial bearing portion (3b) (3B).If the axial region (4a) of the running shaft of compressor (4) keeps identical axle center with extension (4b), so because moment of torsion (moment) is less, thereby load can concentrate be applied to thrust bearing portion (3a) (3a) on, thereby upper and lower bearing plate (3A) thrust bearing portion (3a) (3B) (3a) and above-mentioned thrust bearing portion (3a) (3a) produce serious frictional loss and wearing and tearing between the extension (4b) of pairing running shaft (4).

Summary of the invention

In order to overcome the above-mentioned shortcoming that prior art exists, the invention provides a kind of device that reduces thrust surface friction of hermetic type compressor, with when the running shaft of compressor is identical with the axle center of extension, can reduce the friction between extension and the thrust bearing portion.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of device that reduces thrust surface friction of hermetic type compressor comprises cylinder, running shaft, bearing plate, dividing plate up and down; Described cylinder possesses the inner space of the upper and lower opening that can form pressing chamber, and it is fixedly mounted on the inside of casing; Described running shaft runs through the inner space of cylinder and is connected on the rotor of drive motor, thereby can rotate with rotor; Upper and lower bearing plate, they are connected on the upper and lower opening of cylinder, can constitute the inner space of cylinder with cylinder, and meanwhile, it also gives the support of axle direction and radial direction to described running shaft; Described dividing plate is connected on the running shaft, the inner space of cylinder can be divided into plural at least pressing chamber, simultaneously the fluid of each pressing chamber is moved; Described blade is connected on each bearing plate and can moves up and down, it is being under the state that is shelved on the dividing plate simultaneously, mobile and the convection cell that can cut off the fluid in each pressing chamber while sliding compresses, and makes it be discharged into the inside of casing afterwards; It is characterized in that it also comprises the advance ball bearing part, described advance ball bearing part is inserted in the thrust bearing face of the upper and lower bearing plate that is axially supporting running shaft, sliding contact independently of each other between running shaft extension and thrust bearing.

The present invention solves its technical problem also can adopt following technological scheme:

A kind of device that reduces thrust surface friction of hermetic type compressor comprises cylinder, running shaft, bearing plate, dividing plate, blade up and down; Described cylinder possesses the inner space of the upper and lower opening that can form pressing chamber, and it is fixedly mounted on the inside of casing; Described running shaft runs through the inner space of cylinder and is connected on the rotor of drive motor, thereby can rotate with rotor; Described upper and lower bearing plate is connected on the upper and lower opening of cylinder, can constitute the inner space of cylinder with cylinder, and meanwhile, it also gives the support of axle direction and radial direction to described running shaft; Described dividing plate, it is connected on the running shaft, the inner space of cylinder can be divided into plural at least pressing chamber, simultaneously the fluid of each pressing chamber is moved; At least one blade, it is connected on each bearing plate and can moves up and down, it is being under the state that is shelved on the dividing plate simultaneously, while the mobile and convection cell that cuts off the fluid in each pressing chamber that can slide compresses, makes it be discharged into the inside of casing afterwards; It is characterized in that, it also comprises the advance ball bearing part, described advance ball bearing part is inserted in the supporting surface of the running shaft corresponding with the thrust bearing face of upper and lower bearing plate, between running shaft extension and thrust bearing independently of each other with they sliding contacts.

The device that reduces thrust surface friction of described hermetic type compressor, wherein the advance ball bearing part is made of the 1st outside slide plate, the 2nd outside slide plate, middle slide member; Described the 1st outside slide plate is inserted in the bearing insertion groove of upper and lower bearing plate; Described the 2nd outside slide plate is inserted in the described bearing insertion groove, can contact on the supporting surface of the running shaft corresponding with it; Slide member is installed between the 1st outside slide plate and the 2nd outside slide plate in the middle of described, and can make described two slide plates do relative rotary motion.

The device that reduces thrust surface friction of described hermetic type compressor, wherein the 1st outside slide plate and the 2nd outside slide plate are inserted in the bearing insertion groove and can slide.

The device that reduces thrust surface friction of described hermetic type compressor, wherein the structure of bearing insertion groove is corresponding with the profile of slide member, can keep sliding contact with them.

The device that reduces thrust surface friction of described hermetic type compressor, wherein middle slide member is made of several balls.

The device that reduces thrust surface friction of described hermetic type compressor, wherein in the middle of slide member ringwise or circular arc.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the longitdinal cross-section diagram of the compression structure part of existing blade (vane) formula compressor

Fig. 2 is the exploded perspective view of existing compression structure part

Fig. 3 is for having the longitdinal cross-section diagram after compression structure part is assembled now

Fig. 4 is the exploded perspective view of the compression structure part of vane compressor of the present invention

Fig. 5 is the longitdinal cross-section diagram after the compression structure part assembling of the present invention

Fig. 6 is the exploded perspective view of another example of compression structure part of the present invention

Fig. 7 is the longitdinal cross-section diagram after another example assembling of compression structure part of the present invention

The number in the figure explanation:

5: cylinder 5: dividing plate

6A, 6B: blade (vane)

11,12; Upper and lower bearing plate (bearing plate)

11A, 12A: thrust bearing portion (thrust bearing)

11B, 12B: radial bearing portion (radial bearing)

11a, 12a, 22a: bearing (bearing) insertion groove

11b: oil (oil) guiding groove

20: running shaft 21: axial region

22: extension 31,32: advance ball bearing (ball bearing)

31A, 32A: the 1st outside slide plate

31B, 32B: the 2nd outside slide plate

31a, 32a, 31b, 32b: sliding-groove 31C, 32C: ball (ball)

Embodiment

Example shown in is with reference to the accompanying drawings described in detail the device that hermetic type compressor of the present invention reduces thrust surface friction below.

Shown in Fig. 4,5, adopted the compression structure part of vane compressor of the present invention, comprise cylinder (2), top bearing plate (11), bottom bearing plate (12), running shaft (20), dividing plate (5), the 1st blade (6A), the 2nd blade (6B), support spring (7), advance ball bearing (31) (32), cylinder (2) possesses and is used for sucking and the inner space (V) of compression refrigerant gas, and it is installed in the Lower Half of casing (1); Top bearing plate (11) and bottom bearing plate (11), they be connected to the top of cylinder (2) and below, thereby constituted cylinder assembly with cylinder; Running shaft (20) is connected on the rotor (not shown) of electric structure portion, meanwhile, also run through each bearing plate (11) (12) and be connected with them, thereby it can conduct the power of electric structure portion to compression structure part; Dividing plate (5), it be connected that running shaft (20) is gone up or with the running shaft one, in order to be divided into the 1st pressing chamber (S1) and the 2nd pressing chamber (S2) to the inner space of cylinder (2) (V), it is the sine wave shape that possesses bending point on upper and lower surfaces respectively; The 1st blade (6A) and the 2nd blade (6B), their top and bottom can contact respectively on two faces of dividing plate (5), thereby can be when running shaft (20) rotates each pressing chamber (S1) (S2) are divided into and suck zone and discharging area; Support spring (7) (as shown in Figure 1), it can (6B) give elastic support from two ends to each blade (6A); Advance ball bearing (31) (32), they are inserted in the thrust bearing face (r2) of top bearing plate (11) and bottom bearing plate (12) and can rotate, and it can prevent the friction between thrust bearing face (r2) and the running shaft (20).

Bearing plate (11) (12) is the disc-shape of the top and bottom that can cover cylinder (2), and by thrust bearing portion (11A) (12A) and radial bearing portion (11B) (12B) constitute, wherein above-mentioned thrust bearing portion can give axial sliding support to the extension (22) of above-mentioned running shaft (20); Be formed centrally the axis hole that running shaft (20) is passed in the above-mentioned radial bearing portion, it can give the support of radial direction to the axial region (21) of above-mentioned running shaft (20) and it can be rotated.

Thrust bearing portion (11A) supporting surface (r2) (12A) formed on (r2) cave inward, be used for making bearing insertion groove (11a) that advance ball bearing (31) (32) inserts (12a).Bearing insertion groove (11a) degree of depth (12a) had better not surpass the height of advance ball bearing (31) (32), meanwhile, for advance ball bearing (31) (32) can be rotated, the internal diameter that bearing insertion groove (11a) internal diameter (12a) cans be compared to advance ball bearing (31) (32) most is little, and the external diameter then external diameter than advance ball bearing (31) (32) is big.

As shown in Figure 4, bearing insertion groove (11a) shape (12a) preferably ringwise, but also can be circular arc as the case may be from plane projection; Perhaps as shown in Figure 5, bearing insertion groove (11a) (12a) its shape is quadrilateral from front projection, but as the case may be also can semicircular in shape.In addition, can flow in the groove in order to make oil (oil), bearing insertion groove (11a) (12a) internal surface or outer surface on be preferably formed as axially and along the oil groove (not shown) of radial direction.

As shown in Figure 6, running shaft (20) is made of axial region (21) and extension (22), and its middle shaft part (21) is inserted in the axis hole of upper and lower bearing plate (11) (12), is subjected to the support of radial bearing portion (11B) radial direction (12B); Extension (22) expands outwardly at lower half portion upper edge of axial region (21) radial direction and forms, and their support is gone up and be subjected in the thrust bearing portion (11A) that its upper and lower two faces are shelved on upper and lower bearing plate (11) (12) (12A).

Axial region has formed following structure on (21), i.e. one the 1st oil circuit (21a) through to the upper end from the lower end; Lead to the 2nd oil circuit (21b) of the outer surface of axial region (21) from the centre of the 1st oil circuit (21a), and the oily guiding groove (11b) in the 2nd oil circuit and top bearing plate (11) ('s also forming on the bearing plate of bottom) the radial bearing portion (11B) is connected.

For the center that makes extension (22) and the axle center of axial region (21) are consistent, it keeps concentric with axial region (21) from plane projection.In addition, the two sides of extension (22), promptly the supporting surface of the both sides that (r2) contact with the thrust bearing face (r2) of each bearing plate (11) (12) is smooth.

As Fig. 4 or shown in Figure 5, advance ball bearing (31) (32) but also can be the shape that several circular arcs constitute generally in the form of a ring.

In addition, advance ball bearing (31) (32) is by constituting with lower member, and 1st outside slide plate (31A) of the bearing insertion groove (11a) that promptly is inserted in upper and lower bearing plate (11) (12) in (12a) (32A); (12a) interior the 2nd outside slide plate (31B) is (32B) (32A) to insert bearing insertion groove (11a) at a distance of certain intervals ground with the 1st outside slide plate (31A); Be installed in the 1st outside slide plate (31A) (32A) and the 2nd outside slide plate (31B) (32B) between and can slide can with two pairs of slide plates (31A) (31B) (32A) (32B) separated at regular intervals in the middle of slide member (31C) (32C).

The 1st outside slide plate (31A) (32A) with the 2nd outside slide plate (31B) shape (32B) from plane projection generally ringwise, but according to circumstances also can be circular arc.Or above-mentioned each slide plate (31A) (32A) (31B) shape (32B) generally be quadrilateral from plane projection, but also can make semicircle to their back side according to bearing insertion groove (11a) shape (12a) of above-mentioned each bearing plate (11) (12).In addition, for make above-mentioned each slide plate (31A) (32A) (31B) (32B) can do sliding movement in bearing insertion groove (11a) inside (12a), outside slide plate (31A) (32A) (31B) width (32B) to can be compared to most bearing insertion groove (11a) width (12a) the littlest.

In addition, above-mentioned each slide plate (31A) (32A) formed again on the relative face of (31B) direction (32B) annular or circular arc, be used for inserting in the middle of slide member (31C) and sliding-groove (32C) (31a) (32a) (31b) (32b).Above-mentioned sliding-groove (31a) (32a) (31b) (32b) can be quadrilateral or semicircle according to middle slide member (31C) shape (32C).

As shown in Figure 4 and Figure 5, middle slide member (31C) (32C) preferably is made of several balls, but according to circumstances, its shape also can be annular or the circular arc with circular cross-section or angled cross section.

For the part same as the prior art in the accompanying drawing, use prosign here.

Have a look the action effect of aforesaid hermetic type compressor of the present invention below.

If in electric structure portion, connect power supply, thereby make the words of rotor and running shaft (20) rotation, the dividing plate (5) that is connected so on the running shaft (20) will rotate in the inner space of cylinder (2) (V), is drawn in the 1st pressing chamber (S1) and the 2nd pressing chamber (S2) thereby cold media air replaced.These cold media air move along with dividing plate (5) before this, then by each blade (6A) thus (6B) blocking-up realizes compression, replacing by each pressing chamber (S1) exhaust port (not shown) (S2) at last to be discharged from.

Here, running shaft (20) is to insert to be connected cylinder (2) up and down in the axis hole of the bearing plate at two ends (11) (12), and it can rotate.The axial region (21) of running shaft (20) be slidably supported on each bearing plate (11) (12) radial bearing portion (11B) (12B) on, the thrust bearing portion (11A) that the upper and lower surfaces of extension (22) then are slidably supported on each bearing plate (11) (12) (12A) on, thereby running shaft (20) is kept and the vertical state of cylinder (2).

Such hermetic type compressor is because the axial region (21) of running shaft and the identical axle center of extension (22) maintenance, thereby can not produce moment of torsion (moment) theoretically substantially.So, (r1) compare with thrust supporting surface (r1) radially, thrust bearing face (r2) (r2) can be concentrated the effect be loaded, thus the serious friction of generation between the above and below of upper and lower bearing plate (11) (12) and the extension (22) that contacts the running shaft (20) on them.If but as the present invention, advance ball bearing (31) (32) insert with the supporting surface (r2) of the both sides, extension (22) of running shaft (20) (r2) contacted upper and lower bearing plate (11) (12) thrust bearing face (r2) (r2) in and make its rotatable words, the supporting surface (r2) of the both sides, extension (22) of running shaft (20) (r2) can go up slide at above-mentioned advance ball bearing (31) (32) so, thereby can reduce the friction that produces between (r2) at the thrust bearing face (r2) of upper and lower bearing plate (11) (12) effectively.

Particularly in each advance ball bearing (31) (32), not only have with contacted the 2nd outside slide plate (31B) of running shaft (20) (32B), and also have the 1st slide plate (31A) (32A) be inserted in bearing insertion groove (11a) (12a) in and can be free to slide therein, therefore can reduce the 1st outside slide plate (31A) sliding-groove (31a) (32A) effectively (32a) and as the friction between (32C) of the ball (31C) of middle slide member.

In addition, the part of the oil that the 1st oil circuit (21a) by running shaft (20) drinks up can be infiltrated, the thrust bearing face (r2) of following bearing plate (11) (12) is supporting surface (r2) gap (r2) of the both sides, extension of face and its pairing running shaft (20) (r2), the sliding-groove (31a) that these oil can be filled above-mentioned advance ball bearing (31) (32) (32a) and gap and bearing insertion groove (11a) (12a) internal surface and each outside slide plate (31A) (32A) the gap (31B) (32B) outer surface between of ball (31b) between (32b), thereby can reduce friction between running shaft extension and the thrust bearing more effectively.

In addition, another example of the device that reduces thrust surface friction of hermetic type compressor of the present invention is as described below.

Promptly in above-mentioned example be advance ball bearing (31) (32) is inserted upper and lower bearing plate (11) (12) thrust bearing face (r2) (r2) in, this example then as shown in Figure 6 and Figure 7, it be above-mentioned advance ball bearing (31) (32) is inserted the extension (22) on the running shaft (20) upper and lower supporting surface (r2) (r2) in.

In this case, the two-side supporting face (r2) that is preferably in the extension (22) of running shaft (20) (r2) go up to form the bearing insertion groove (22a) that caves inward (22a), inserts each advance ball bearing (31) (32) in the above-mentioned groove and it can be rotated.

The concrete structure of the device that reduces thrust surface friction of this example and action effect thereof and above-mentioned example are similar, so in the explanation of this omission to it.

The effect of invention

The device that reduces thrust face friction of hermetic type compressor of the present invention upper and lower bearing Pan with revolve In the thrust bearing-surface between the rotating shaft advance ball bearing has been installed, thereby can have been reduced the rotating shaft expansion Friction between section and the thrust bearing, therefore by the present invention can reduce bearing plate and rotating shaft it Between wearing and tearing and noise between the parts that take place, thereby reduce friction loss, and then can improve compression The reliability of machine.

Claims (7)

1, a kind of device that reduces thrust surface friction of hermetic type compressor comprises cylinder, running shaft, bearing plate, dividing plate up and down; Described cylinder possesses the inner space of the upper and lower opening that can form pressing chamber, and it is fixedly mounted on the inside of casing; Described running shaft runs through the inner space of cylinder and is connected on the rotor of drive motor, thereby can rotate with rotor; Upper and lower bearing plate, they are connected on the upper and lower opening of cylinder, can constitute the inner space of cylinder with cylinder, and meanwhile, it also gives the support of axle direction and radial direction to described running shaft; Described dividing plate is connected on the running shaft, the inner space of cylinder can be divided into plural at least pressing chamber, simultaneously the fluid of each pressing chamber is moved; Described blade is connected on each bearing plate and can moves up and down, it is being under the state that is shelved on the dividing plate simultaneously, mobile and the convection cell that can cut off the fluid in each pressing chamber while sliding compresses, and makes it be discharged into the inside of casing afterwards; It is characterized in that it also comprises the advance ball bearing part, described advance ball bearing part is inserted in the thrust bearing face of the upper and lower bearing plate that is axially supporting running shaft, sliding contact independently of each other between running shaft extension and thrust bearing.

2, a kind of device that reduces thrust surface friction of hermetic type compressor comprises cylinder, running shaft, bearing plate, dividing plate, blade up and down; Described cylinder possesses the inner space of the upper and lower opening that can form pressing chamber, and it is fixedly mounted on the inside of casing; Described running shaft runs through the inner space of cylinder and is connected on the rotor of drive motor, thereby can rotate with rotor; Described upper and lower bearing plate is connected on the upper and lower opening of cylinder, can constitute the inner space of cylinder with cylinder, and meanwhile, it also gives the support of axle direction and radial direction to described running shaft; Described dividing plate, it is connected on the running shaft, the inner space of cylinder can be divided into plural at least pressing chamber, simultaneously the fluid of each pressing chamber is moved; At least one blade, it is connected on each bearing plate and can moves up and down, it is being under the state that is shelved on the dividing plate simultaneously, while the mobile and convection cell that cuts off the fluid in each pressing chamber that can slide compresses, makes it be discharged into the inside of casing afterwards; It is characterized in that, it also comprises the advance ball bearing part, described advance ball bearing part is inserted in the supporting surface of the running shaft corresponding with the thrust bearing face of upper and lower bearing plate, between running shaft extension and thrust bearing independently of each other with they sliding contacts.

3, the device that reduces thrust surface friction of hermetic type compressor according to claim 1 and 2 is characterized in that described advance ball bearing part is made of the 1st outside slide plate, the 2nd outside slide plate, middle slide member; Described the 1st outside slide plate is inserted in the bearing insertion groove of upper and lower bearing plate; Described the 2nd outside slide plate is inserted in the described bearing insertion groove, can contact on the supporting surface of the running shaft corresponding with it; Slide member is installed between the 1st outside slide plate and the 2nd outside slide plate in the middle of described, and can make described two slide plates do relative rotary motion.

4, the device that reduces thrust surface friction of hermetic type compressor according to claim 3 is characterized in that described the 1st outside slide plate and the 2nd outside slide plate are inserted in the bearing insertion groove and can slide.

5, the device that reduces thrust surface friction of hermetic type compressor according to claim 3 is characterized in that the structure of described bearing insertion groove is corresponding with the profile of slide member, can keep sliding contact with them.

6, the device that reduces thrust surface friction of hermetic type compressor according to claim 5 is characterized in that described middle slide member is made of several balls.

7, the device that reduces thrust surface friction of hermetic type compressor according to claim 5, it is characterized in that described in the middle of slide member ringwise or circular arc.

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