JPS6278499A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve dynamic balance performance of a shaft by arranging between a roller and the shaft a slide member capable of moving in radial direction against the shaft as well as allowing the rotation of the roller. CONSTITUTION:Between a roller 4 and a shaft 5 is arranged a slide member 19 with its entire periphery in contact with the inner circumference of the roller 4. The slide member 19 has such a constitution that it engages with a slide surface 5b of a shaft 5 and can move only in the radial direction of the shaft. Accordingly, when the shaft 5 is rotated, the slide member 19 slides in the radial direction due to the centrifugal force to drive the roller 4 while pressing it against the inner circumference of a cylinder 3. However, since the centrifugal force of the slide member 19 is not exerted on the shaft 5, dynamic balance performance of the shaft 5 is remarkably improved.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a rotary compressor.

[Background of the invention]

Conventional rotary compressor A rolling piston type rotary compressor, for example used in a cooling system such as a household air conditioner, has an electric element and a compression element, with the electric element installed at one end of the shaft. The rotor is attached, and the crank part of the compression element is provided eccentrically at the other end integrally with the shaft, and the roller is fitted into this crank part so as to be freely rotatable.
The structure is such that the rotation of the shaft causes the shift flank and rollers to roll eccentrically within the cylinder. In this case, the centrifugal force of the crank and rollers acts on the shaft, causing an imbalance, but in order to balance the rotation in this case, it is common practice to attach a balance weight to the rotor. The constructed NFCO-CREE compressor had the following problems.

(1) During high-speed rotation, the centrifugal force of the balance weight increases, causing the shaft to deflect, causing the bearing to come into contact with one side and increasing mechanical loss. (2) Due to the deflection of the shaft, the balance of the single rotation system The n1 vibration collapses and the WiL sound increases.

As a rotary pressure mM& that improves the rotational balance during high-speed rotation, there is a known rotary pressure mM& that has a structure in which a part of the shaft is cut out to improve the balance and all or part of the balance weight attached to the rotor is removed (n Utility Model Application No. 59-27186, Utility Model Application No. 59-105086
Publication No.). This configuration eliminates the need for all or part of the balance weight, so there is no centrifugal force due to this.
It is possible to eliminate deflection of the shaft during high-speed rotation and maintain good rotational balance, but in practice, when balancing in this way, a considerable part of the shaft ends up being cut out, which reduces the strength of the shaft. There were problems that needed to be improved, such as asymmetrical structure and difficulty in machining.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a rotary compressor that has a relatively simple configuration, eliminates the balance weight, and makes it possible to improve compressor performance. It is something to do.

[Summary of the invention]

That is, the present invention provides a cylinder provided with end plates on at least both end surfaces, a roller that rotates within this cylinder, a shaft that rotates this roller, an electric element that drives this shaft, and an electric element that is self-exhausted by the roller and rotates the shaft. In a rotary compressor, a vane that reciprocates in a guide groove bored in the cylinder according to the invention and partitions the inside of the cylinder into a suction chamber and a compression chamber is moved southward, and there is a space between the roller and the shaft relative to the shaft. It is characterized by the provision of a slide member that is slidable in the radial direction and allows the roller to rotate freely, thereby forcing the roller to come into contact with the cylinder by the slide member.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1 to 6.

As shown in FIG.
A roller 4 that eccentrically rolls inside, a shaft 5° that gives rotation to this roller 4, tt that drives this shaft 5! A guide groove (not shown) bored in the cylinder 6 according to the rotation of the shaft 5 that abuts the motor 6 and the roller 4.
The cylinder 3 is provided with vanes 9 and the like that reciprocate inside the cylinder 3 and partition the inside of the cylinder 3 into a suction chamber 7 and a compression chamber 8. In the same figure, 1
0 is a spring that urges self-ejection between the vane 9 and the roller 4, 2a is a discharge port provided on the lower end plate 2, 2b is a discharge valve attached to 2a, 11 is a suction hoard, 12 is a discharge silencer, 13 is an upper end plate 1, and a cylinder 3.
and lower end plate 2f: a discharge gas passage provided through it;
Reference numerals 14 and 15 are suction pipes and discharge pipes connected to external cycles. The lower end of the shaft 5 is immersed in lubricating oil 17 stored at the bottom of the closed container 16, and as the shaft 5 rotates, the lubricating oil 17 is pumped up through the oil supply hole 18 formed inside. The sliding parts of the respective bearings are lubricated. In the rotary compressor f' constructed in this way, in this embodiment, there is a roller between the roller 4 and the shaft 5, which is slidable in the radial direction with respect to the shaft 5. In addition, a slide member 19 is provided that allows the roller 4 to rotate freely on its axis.By doing so, the slide member 19 is provided between the crawler 4 and the shaft 5 so that it can slide freely in the radial direction with respect to the shaft 5, and the roller 4 can freely rotate on its axis. Since the ride member 19 is provided, the roller 4 comes into contact with the cylinder 3 by the slide member 19, and the centrifugal force of the roller 4 and the slide member 19 does not act on the shaft 5, resulting in a relatively simple configuration. remove balance weight,
A rotary compressor that can improve compressor performance can be obtained.

That is, although the slide member 19 is slidably attached to the slide s5b provided on the shaft 5, the compression action of the rotary compressor is performed as follows.

When the shaft 5 is driven by the motor 6, the roller 4, which is rotatably fitted to the slide member 19, rotates inside the cylinder 6, and a suction chamber 7 and a compression chamber 8, which are partitioned by vanes 9, are opened.
and the volume changes. When the shaft 5 rotates once as indicated by the arrow (see the first rotation), the volume of the suction chamber 7 becomes the highest, and refrigerant gas is sucked in from the suction pipe 14 through the suction hoard 11. On the other hand, the volume of the compression chamber 8 becomes smaller and the refrigerant gas is compressed, and this compressed refrigerant scum enters the discharge silencer 12 from the discharge boat 2a through the discharge valve 2b, and is further discharged. The waste is discharged through the waste passage 15 into a closed container 16, and flows out from the discharge pipe 15 into the external cycle. Such compression action is repeated.

The effects of the above embodiments have been studied and will be described next. The conventional example was also used for comparative study to examine the effects. Figures 4(a) and (b) show the results of the conventional example, and Figures 5(a) and (b) show the results of this example. The results of the study are shown.
ing. In these figures, F is the waste pressure load due to the pressure difference (PC-P) between the suction chamber 7 and the compression chamber 8 in the cylinder 6, Fn is the vane pressing force, and F is the centrifugal force s of the roller 4.
F8 is the centrifugal force of the slide member 19. Figure 4 (
In the conventional example of a), a crank m5a is provided integrally with the shaft 5 and eccentric by a length a, and a roller 4 is fitted into this crank portion 5a so as to be able to rotate freely on its axis. There is a gap δ. Therefore, the shaft 5 has centrifugal force (not shown) due to the crank portion 5a and p
-24 centrifugal force F, moves as an unbalanced force. In addition, the roller 4 has an FP as shown in the same figure (bl).
A resultant force F of +Fn +Fa+ acts, and this becomes the bearing load.

In contrast, in this embodiment, the slide member 19 is slidable in the radial direction as shown in FIG.
The centrifugal force F of the roller 4 and the slide member 19
The centrifugal force FB does not act directly on the shaft 5 as an unbalanced force, and the radial force acting on the roller 4 is supported by the reaction force of the cylinder B indicated by the broken line arrow in the figure. In addition, the load applied to the bearing between the inner surface of the roller 4 and the slide member 19 is applied to the cylinder 6
Due to the pressure difference between the suction chamber 7 and the compression chamber 8 in the 1F
, and the centrifugal force F8 of the slide member 19, the resultant force F<! :The bearing load of the conventional example is also reduced, and the friction loss can be reduced.Furthermore, the gap between the cylinder 6 and the roller 4 becomes zero, and there is no leakage in this part. Internal leakage losses are reduced. This characteristic is exhibited because the roller 4 comes into contact with the cylinder 6 through the slide member 19 as described above.

In this embodiment, n is the roller 4. Slide member 1
The centrifugal force of 9 is now received by the cylinder 3, and the centrifugal force of the roller 4 and slide member 19 does not act on the shaft 5, so the shaft 5 is not unbalanced, there is no need for a balance weight, and the bearing The load is reduced, reducing mechanical losses and improving compressor performance.

〔Effect of the invention〕

As mentioned above, the present invention has a relatively simple configuration, eliminates the balance weight, and improves the performance of the N1 compressor.
It is possible to obtain a low-pressure compressor that can eliminate the balance way if and improve compressor performance with a relatively simple configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along line A-A in FIG. 2 of an embodiment of the p-cris compressor of the present invention, and FIG. 2 is a rotary pressure i of the present invention.
FIG. 6 is an exploded perspective view of the Nuride member and its surroundings, FIG. 4(a), (
b) shows the state of the load acting on a conventional roller; (a) is a cross-sectional view of the roller circumference p; (b) is a resultant force diagram;
Figures (a) and (b) show the state of the load acting on the roller of this example. (a) is a cross-sectional view around the roller, and (
b) is a resultant diagram. 1... Upper end plate, 2... Lower end plate % 5... Cylinder, 4... Roller, butt... Shaft, 6... Motor (shaft element), 7... Suction chamber % 8 ...Compression chamber, 9
... Vane, 19... Slide member.

Claims (1)

[Claims] 1. A cylinder provided with end plates on at least both end surfaces thereof, a roller that rotates within this cylinder, a shaft that rotates this roller, an electric element that drives this shaft, and a cylinder that comes into contact with the roller and follows the rotation of the shaft. In a rotary compressor, the rotary compressor has a vane that reciprocates in a guide groove bored in the cylinder and partitions the inside of the cylinder into a suction chamber and a compression chamber. A rotary compressor characterized by having a slide member that is movable and whose rollers can rotate freely.