JPH0518384A - Vertical hermetic compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple structure, it is possible to favorably receive the thrust load acting above and below the crankshaft 3 while preventing the generation of noise and vibration. [Structure] Immediately below an upper main bearing 61, an inner ring 7b and an outer ring 7c having balls 7a and arcuate recesses for receiving the balls 7a.
A thrust ball bearing 7 provided with the inner ring 7b interposed in the radial direction of the crankshaft 3 in a non-contact state, and
The stepped portion 31 and the C-shaped retaining ring 8 are locked in the axial direction so that the inner ring 7b and the outer ring 7c can be moved even if the crankshaft 3 is displaced vertically.
The ball 7a is stretched between the two to receive the upper and lower thrust loads, eliminate the play between the ball 7a and the inner ring 7b and between the ball 7a and the outer ring 7c, and
the ball 7a and the inner ring 7 without applying a radial load to a.
The position of each contact point with b or the outer ring 7c was made invariable to stabilize the behavior of the ball 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust support structure for a crankshaft in a vertical hermetic compressor in which a scroll type compression element is installed on one side in the vertical direction of a hermetic casing and a motor for driving the compression element is installed on the other side. Regarding improvement.

[0002]

2. Description of the Related Art A compression element C having a fixed scroll F and a movable scroll O is arranged above the inside of a hermetically sealed casing, as disclosed in Japanese Patent Publication No. 1-38199, and as shown in FIG. The compression element C is driven by a crankshaft D extending from a motor arranged below,
A main bearing M, which is a combination of a rolling bearing R and a sliding bearing E, is interposed between the crankshaft D and the housing H to receive a radial load acting in the radial direction of the crankshaft D, and A thrust ball bearing having a pair of disc-shaped rings J, K and a ball B, which receives a thrust load acting upward when the crankshaft D moves upward, between the shaft end of D and the boss hole W of the movable scroll O. A plate-shaped thrust sliding bearing P is mounted on the lower surface of the inner ring T of the rolling bearing R and receives a thrust load acting downwardly of the crankshaft D. Even if it is displaced in the direction of, the thrust load above and below can be received.
Incidentally, V is a pin portion bearing between the crankshaft D and the movable scroll O.

[0003]

However, in the above, in order to receive the thrust load acting upward,
Since the thrust ball bearing S having the pair of disc-shaped rings J and K and the ball B is used, the thrust load acting upwardly by the thrust ball bearing S is received with the upward movement of the crankshaft D, and each disc type is supported. When sliding contact is made between the rings J and K and the ball B, these dish-shaped rings J and K
There is no play between K and the ball B, and the generation of noise and vibration is not a problem, but the crankshaft D does not move upwards and sinks due to its own weight, etc., and the thrust slide bearing P on the lower side moves downward. When the acting thrust load is being received, play can be made between each of the dish-shaped rings J, K and the ball B in the thrust ball bearing S, and the behavior of the ball B becomes unstable, resulting in noise and vibration. There is a problem that occurs.

Further, in order to receive the vertical thrust load, two types of bearings, the thrust ball bearing R and the thrust slide bearing P, are required, which results in cost increase and, in particular, the thrust ball bearing which receives an upward thrust load. Since S is interposed in the boss hole W of the interposed scroll O, there is a problem that the structure becomes complicated.

A main object of the present invention is to provide a vertical hermetic compressor capable of preventing generation of noise and vibration, and having a simple structure and capable of favorably receiving a thrust load acting on the upper and lower sides of a crankshaft. It is in.

[0006]

Therefore, in the present invention, in order to achieve the above main object, firstly, the closed casing 9 is used.
The compression element 10 on one side in the vertical direction and the crankshaft 3 on the other side.
In a vertical hermetic compressor in which motors 4 each having a motor are installed, a main bearing 6 that receives a radial load acting in the radial direction of the crankshaft 3 is interposed between the crankshaft 3 and the housing 5, and a ball 7a and an inner ring 7b and an outer ring 7c respectively provided with recessed contact portions for receiving the same, the thrust ball bearing 7 is formed, and the inner ring 7b of the thrust ball bearing 7 is not moved in the radial direction of the crankshaft 3. While in contact with each other and locking the crankshaft 3 in the axial direction, the outer ring 7c of the thrust ball bearing 7 is locked to the housing 5 to allow the crankshaft 3 to rotate.
The upper and lower thrust loads acting in the axial direction are received through the thrust ball bearings 7.

Secondly, in order to simplify the lubrication structure of the thrust ball bearing 7 in the above-mentioned first construction, the thrust ball bearing 7 is arranged immediately below the main bearing 6 and the thrust ball bearing 7 is arranged.
The upper surface of the main bearing 6 and the lower surface of the main bearing 6 are opposed to each other with a gap therebetween, and the main bearing 6 is connected to the oil supply hole 37 provided in the crankshaft 3.

Thirdly, in order to facilitate the assembling and disassembling of the thrust ball bearing 7 in the first or second construction,
The crankshaft 3 is provided with a receiving portion 31 that locks one side of the inner ring 7b in the vertical direction of the thrust ball bearing 7, and the locking body 8 that locks the crankshaft 3 to the other side of the inner ring 7b in the vertical direction is attached and detached. I installed it freely.

[0009]

With the above first means, the inner ring 7b which constitutes the thrust ball bearing 7 regardless of the vertical displacement of the crankshaft 3
The ball 7a can be stretched between the outer ring 7c and the outer ring 7c to receive the thrust load acting upward or downward, and at this time, the ball 7a and the inner ring 7b and the ball 7a and the outer ring 7c are separated from each other. Are in contact with each other and there is no play. Further, the inner ring 7a is not in radial contact with the crankshaft 3, and the inner ring 7b is not in contact with the crankshaft 3.
Since the radial load of the ball 7a does not act, the position of each contact point between the ball 7a and the inner ring 7b and between the ball 7a and the outer ring 7c hardly changes.
The behavior of a is stable, and the generation of noise and vibration can be prevented.

By the above-mentioned second means, the oil supplied to the main bearing 6 can be naturally dropped and supplied to the thrust ball bearing 7,
The thrust ball bearing 7 can be easily refueled.

By attaching and detaching the locking body 8 by the third means, the thrust ball bearing 7 can be easily attached and detached, and the workability during manufacturing and maintenance can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The vertical hermetic compressor shown in FIGS.
In the inside of the closed casing 9 joined through a and 9b,
A housing 5 having an upper housing 51, a lower housing 52, and a bottom fixing plate 53 is arranged, and a spiral body 12 and an outer peripheral wall 13 are projectingly provided on an end plate 11 above the inside of the casing 9 through the housing 5. Fixed scroll 1
And a movable scroll 2 in which a scroll 22 is projected from the end plate 21.
The interior of the compression element 10 having and
A motor 4 having a rotor 41 and a stator 42, in which the crankshaft 3 is coupled to the rotor 41 via a key 43 and a fixing nut 44, is incorporated.

An eccentric hole 3a is provided in the crank pin portion 30 provided at the upper end of the crankshaft 3, and a boss portion 23 protruding from the lower surface of the movable scroll 2 is fitted into the eccentric hole 3a via a cylindrical roller bearing 3b. At the same time, the Oldham ring 32, which constitutes a rotation preventing mechanism, is engaged with the movable scroll 2, and the movable scroll 2 is revolved with respect to the fixed scroll 1 by driving the motor 4, so that the suction pipe 14 and the lower housing 5 are rotated.
After the suction gas taken into the inside of the motor 2 passes through the filter 15, the air gap 45 and the outer peripheral gap 46 of the motor 4 are
The casing 9 through the opening 16
After opening once inside the suction port, the suction port 17
The compressed discharge gas is taken out from the discharge chamber 96 through the discharge hole 94 at the center of the spiral through the discharge chamber 94 and the oil separator 95 to the outside through the discharge pipe 96.

Further, an oil supply pump device 34 is provided at the lower end of the crank 3, and an oil supply hole 36 is provided in the crankshaft 3 from an oil sump 90 at the bottom through an oil pickup 35.
The oil is pumped up to 37 and supplied to each part, and the oil flowing out from the accommodation chamber 50 of the crankpin part 30 and the oil separated by the oil separator 95 and discharged through the capillary tube 97 are discharged through the oil discharge pipe 98. I try to return it to the reservoir 90.

With the above construction, an upper main bearing 61 composed of a cylindrical ball bearing is provided between the crankshaft 3 and the upper housing 51.
The crankshaft 3 and the lower housing 52.
A lower main bearing 62 composed of a slide bearing is interposed between the upper and lower main bearings 61 and 62 to form a main bearing 6 which receives a radial load acting in the radial direction of the crankshaft 3. As shown in FIG. 1, the upper main bearing 61 includes a cylindrical roller 61a and an inner ring 61 that contacts the cylindrical roller 61a.
b and an outer peripheral portion holder 61c.

Further, as shown in FIG. 1, a thrust ball bearing 7 is formed which includes a ball 7a and an inner ring 7b and an outer ring 7c, each of which is provided with a contact portion for receiving the ball and recessed in an arc shape. The ball bearing 7 is arranged immediately below the upper main bearing 61 constituting the main bearing 6, and the upper surface portion of the thrust ball bearing 7 and the lower surface portion of the upper main bearing 6 are opposed to each other with a gap therebetween. The oil supply hole 37 provided in the crankshaft 3 is communicated with the upper main bearing 61 through a communication passage 37a.

By making the inner diameter of the inner ring 7b of the thrust ball bearing 7 larger than the outer diameter of the crankshaft 3, the inner ring 7b is interposed in the radial direction of the crankshaft 3 in a non-contact state, and the inner ring 7b is also provided. The receiving portion 31 formed of an annular step portion is provided on the outer peripheral portion of the crankshaft 3 located above
An annular plate 31a is sandwiched between the receiving portion 31 and the upper side of the inner ring 7b is locked, and an annular groove is provided on the outer peripheral portion of the crankshaft 3 located below the inner ring 7b. The constituent locking body 8 is detachably attached, and the lower side of the inner ring 7b is locked by interposing an annular plate 8a on the upper part of the locking body 8, whereby the inner ring 7b is attached to the shaft of the crankshaft 3. Lock in the direction. It is to be noted that the inner ring 7b is brought into a non-contact state in the radial direction of the crankshaft 3 by the crankshaft 3
This is to prevent the radial load acting in the radial direction from being transmitted to the inner ring 7b side. Further, in the illustrated embodiment, a gap is also provided in the height direction of the inner ring 7b, but this is sandwiched between the upper and lower annular plates 31a, 8a when the crankshaft 3 is displaced in the radial direction, so that the inner ring 7b is This is to reliably prevent the possibility of displacement and receiving a radial load in effect.

On the other hand, the outer ring 7c of the thrust ball bearing 7
The outer peripheral portion of is locked by press fitting to the upper housing 51 side.

With the above construction, as shown in FIG. 1, when the crankshaft 3 is displaced upward by overcoming the gravity load by the upward lift force due to the tilting of the cylindrical roller 61a provided in the upper main bearing 61, for example, The ball 7a can be stretched between the lower part of the contact part of the inner ring 7b and the upper part of the contact part of the outer ring 7c that form the thrust ball bearing 7, and the thrust load acting upward can be received. Since there is no play between the ball 7a and the inner ring 7b and between the ball 7a and the outer ring 7c, and the radial load of the crankshaft 3 does not act on the inner ring 7a, these balls 7a and 7b And the position of each contact point between the ball 7a and the outer ring 7c hardly changes, so that the behavior of the ball 7a is stable and noise and vibration are prevented. Than is possible.

On the other hand, as shown in FIG.
However, when the ball 7a is displaced downward due to the gravity load, the ball 7a is stretched between the upper part of the contact portion of the inner ring 7b and the lower part of the contact portion of the outer ring 7c forming the thrust ball bearing 7,
It is possible to receive the thrust load acting downward, and in this case as well, there is no play due to the contact between the ball 7a and the inner ring 7b or the outer ring 7c, and moreover, the ball 7a and the inner ring 7b. Alternatively, since the position of each contact point with the outer ring 7c hardly changes, it is possible to prevent the generation of noise and vibration.

Moreover, while the vertical thrust load can be satisfactorily received as described above, only one thrust ball bearing 7 is required, and the structure can be simplified and downsized, and the sliding contact can be avoided. Since the bearing structure is formed by rolling contact without using the balls 7a, durability can be improved.

Further, the thrust ball bearing 7 is arranged immediately below the upper main bearing 61, and the upper surface portion of the thrust ball bearing 7 and the lower surface portion of the upper main bearing 6 are opposed to each other with a gap interposed therebetween.
Since the oil supply hole 37 provided in the crankshaft 3 is communicated with the upper main bearing 6, the oil supplied to the upper main bearing 61 can be naturally dropped and supplied to the thrust ball bearing 7, and the oil supply to the thrust ball bearing 7 can be simplified. You can also do it.

Further, the crankshaft 3 is provided with a receiving portion 31 for locking the upper side of the inner ring 7b of the thrust ball bearing 7, and the locking body 8 for locking the upper side of the inner ring 7b on the crankshaft 3 is freely detachable. By attaching and detaching the locking body 8, the thrust ball bearing 7 can be easily attached and detached, and the workability at the time of manufacturing and maintenance can be improved.

[0024]

As described above, according to the first aspect of the invention, the simple structure in which only one thrust ball bearing 7 is provided provides
Generation of noise and vibration can be prevented, and the thrust load acting on the upper and lower sides of the crankshaft 3 can be well received.

According to the second aspect of the present invention, the thrust ball bearing 7 can be lubricated more easily.

According to the third aspect of the invention, the thrust ball bearing 7 can be easily attached and detached, and the workability at the time of manufacturing and maintenance can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a vertical hermetic compressor according to the present invention when a crankshaft moves up.

FIG. 2 is a cross-sectional view of the main parts of the compressor when the crankshaft moves down.

FIG. 3 is a sectional view showing an overall upper structure of the compressor.

FIG. 4 is a cross-sectional view showing an entire lower structure of the compressor.

FIG. 5 is a longitudinal sectional view of a main part of a conventional vertical hermetic compressor.

[Explanation of symbols]

3 crankshaft 4 motor 5 housing 6 Main bearing 7 Thrust ball bearing 8 locking body 9 closed casing 10 compression elements 31 Receiver 37 Lubrication hole 7a ball 7b inner ring 7c outer ring

Claims (3)

[Claims] 1. A vertical hermetic compressor in which a compression element 10 is installed on one side in the vertical direction of a hermetic casing 9 and a motor 4 having a crankshaft 3 is installed on the other side.
A main bearing 6 for receiving a radial load acting in the radial direction of the crankshaft 3 is interposed between the housing 5 and the housing 5, and a ball 7a and an inner ring 7b provided with a recessed contact portion for receiving the ball 7a, respectively. The thrust ball bearing 7 including the outer ring 7c is formed, and the inner ring 7b of the thrust ball bearing 7 is brought into non-contact with the crankshaft 3 in the radial direction and locked in the axial direction of the crankshaft 3, while The outer ring 7c of the thrust ball bearing 7 is attached to the housing 5
The vertical hermetic compressor is characterized in that the upper and lower thrust loads acting in the axial direction of the crankshaft 3 are received through the thrust ball bearings 7 by being locked to the. 2. A thrust ball bearing 7 is arranged immediately below the main bearing 6 so that an upper surface portion of the thrust ball bearing 7 and a lower surface portion of the main bearing 6 face each other with a gap therebetween, and the main bearing 6 The vertical hermetic compressor according to claim 1, wherein an oil supply hole 37 provided in the crankshaft 3 is communicated with the crankshaft 3. 3. A crankshaft 3 is provided with a receiving portion 31 for locking one side of an inner ring 7b in a vertical direction of a thrust ball bearing 7, and a member for locking the other side of the inner ring 7b in the vertical direction to the crankshaft 3. The stopper 8 is detachably attached.
Alternatively, the vertical hermetic compressor according to claim 2.