JPH09296785A - Balance type scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out smooth rotation without vibration by equalizing the weights of a boss part, an eccentric wheel, and a bearing, with the weight of a turning scroll gear, a turning scroll end plate, and a pin crank on a position where revolutionary radial sizes are made eccentrically in a reverse direction respectively by 90 deg. in the 180 deg. plane of driving shaft center. SOLUTION: A turning scroll 3 is carried out turning motion for revolving around a driving shaft 4 by rotation of the driving shaft 4. Both lap parts of the lap part 3a of the turning scroll 3 and the lap part 3b of a fixed scroll 1 are engaged with each other, a fluid sucked from an intake opening is sealed in a combustion chamber 8, and compression action is carried out to exhaust from an ejection opening 10 gradually. At this time, all weights of the revolutionary relation part of the turning scroll gear 3a which exists in a reverse direction at 90 deg. by revolutionary radial sizes 21, 12, a turning scroll end plate 3c, and a pin crank, and all weights of the revolutionary relation part of a boss part 3d, a bearing 7, and an eccentric wheel 5, are balanced, and its balance constitution is held in every rotation positions of the driving shaft 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which orbiting scrolls are balanced in scroll liquid machines.

[0002]

2. Description of the Related Art As shown in FIG. 1, an orbiting structure of an orbiting scroll of a scroll liquid machine mainly composed of a fixed scroll, an orbiting scroll, a drive shaft and a casing is shown in FIG. 3a orbiting scroll teeth, 3c orbiting scroll end plate, 5 eccentric rings, 7 bearings, and 3d end plate backside boss part are formed in the same axis center on the revolving axis.

[0003]

As described above, the revolving structure of the three-orbiting scroll of the conventional scroll fluid machine is such that the eccentric shaft or the five eccentric rings corresponding to the shaft, the seven bearings required for the revolution, and the 11 revolutions. Radial dimension and 3d to fit bearing
The boss portion and the 3a orbiting scroll teeth integrally formed with these 3a, 3c orbiting scroll end plate, and 2a pin crank have the same shaft center and the same revolution radius dimension. The total weight acts on the four drive shafts. Therefore, the four drive shafts are configured as shown in FIG. 1, and the revolving-related part of the three orbiting scroll described above acts as a large unbalanced force on the four drive shafts due to the dimension of the orbital radius of the orbital revolution and the total weight of the revolving-related parts. It is a cause of vibration and requires a heavy weight balance weight.

In other words, in order to balance this unbalanced force, 12 balance weights were mounted at a position having a 180 ° phase with the orbiting-related portion to achieve a balance. As described above, the balance weight is one whose size and weight are determined by the total radius of the orbital part and the orbital radius dimension, and usually requires an extremely large shape and weight. Is. Also, in order to make the weight and shape of the 12 balance weight small, it is thought that a light alloy such as aluminum should be used because it is necessary to reduce the total weight of the part related to the revolution. With scroll teeth and the like, there is a great possibility that seizure will occur due to expansion, and dimensional control is extremely difficult. Also, if the revolution radius dimension is made smaller, the unbalanced force becomes smaller. However, making the revolution radius dimension smaller leads to a large reduction in the discharge amount, so the revolution radius dimension should be made extremely small. I can't. Therefore, 12 balance weights are absolutely necessary, but due to the increase in the balance weights, the scroll fluid machine itself becomes large and the cost is high, and the balance configuration and assembly are complicated.
It's not compact.

[0005]

Means for Solving the Problems At a boss portion on the rear surface of an end plate of an orbiting scroll, an eccentric ring for revolving the orbiting scroll is mounted by fitting a bearing on its outer periphery. The drive shaft is fitted at a position where the radial dimension is eccentric, and the orbiting scroll teeth and the orbiting scroll are placed at a position where the revolution radius dimension is decentered by 90 ° in the opposite direction from the drive shaft with a 180 ° phase with the eccentric ring center. The orbiting center of gravity of the end plate and the pin crank is configured so that the weights of the boss portion, the eccentric ring, and the bearing are equal to the weights of the orbiting scroll teeth, the orbiting scroll end plate, and the pin crank.

[0006]

The weight of the boss portion, the eccentric ring, the bearing and the orbiting scroll teeth, the orbiting scroll end plate, and the pin crank are eccentric to the plane 180 ° about the drive shaft and the orbital radius dimensions 90 ° in opposite directions. Since the center of gravity of the orbiting scroll as a whole is held at the drive shaft center, the unbalance phenomenon does not occur, and smooth rotation without vibration is guaranteed.

[0007]

EXAMPLE An example of FIGS. 1 and 2 will be described. FIG. 1 shows a conventional structure having 3a orbiting scroll teeth, 3c orbiting scroll end plate, 2a pin crank and 5 eccentric ring, 7 bearings, 3d same boss portion with 4 drive shaft centers and 11 orbital revolution radius dimensions and the same shaft center. It is a thing. FIG. 2 shows an embodiment according to the present invention, in which 1 is a fixed scroll, which comprises 9 inlets and 10 outlets. Reference numeral 2 denotes a housing, which is fitted with the 11 motor in the same axial center by static fitting. Reference numeral 2a denotes a pin crank, which holds the three-orbiting scroll in revolution drive. 3
The orbiting scroll teeth a engage the same wrap portion and the 3b wrap portion of the fixed scroll to form eight compression chambers, and compress the fluid from the outer circumference of the scroll to the central portion. 3 orbiting scroll, 3c orbiting scroll end plate, 2a pincrank's orbiting center of gravity and 11 revolution radius dimension are eccentric, and 4 drive shafts are inserted. The 3 orbiting scroll, the 3c orbiting scroll end plate, the 2a pin crank orbiting center of gravity, and the 180 degree phase position in which the 12 revolution radius dimension is decentered via the 4 drive shafts,
A 5-braided ring having 7 bearings fitted on the outer circumference is fitted to the boss portion on the back surface of the 3d end plate. 4a centering around 4 drive shafts, 3a orbiting scroll teeth, 3c orbiting scroll end plate, 2a pin crank orbiting weights, which are eccentric by 90 ° in opposite directions through the l1, l2 revolution radius dimensions on the 180 ° plane And 3
The d boss portion, the 7 bearings, and the turning weights of the 5 eccentric wheels are balanced.

Next, the operation will be described. The rotation of the four drive shafts causes the three orbiting scrolls to perform a revolving motion that revolves around the drive shafts. As a result, the wrap portion of the orbiting scroll tooth 3a and both lap portions of 3b are engaged, the fluid sucked from the 9 suction port is enclosed in the 8 compression chamber, and the fluid is exhausted from the 10 discharge port sequentially. At this time, l1, l2
3a orbiting scroll teeth, 3c orbiting scroll end plate, 2a pin crank orbital total weight, 3d boss portion, 7 bearings, 5 present at 90 ° in the orbital radius dimension, respectively.
The total weights of the eccentric wheels, which are related to the revolution, are kept in balance with each other at any rotational position of the four drive shafts.

Further, in order to secure the size of the orbiting scroll, the revolution radius dimension, and other materials necessary for rotation, even if the revolution radius dimensions are arranged in opposite directions on the 180 ° plane as in the above configuration, It may happen that the weight configurations on both sides of the drive shaft cannot be the same. However, even in such a configuration, the necessary weight difference between the boss portion, the eccentric ring, the bearing and the orbiting scroll teeth, the orbiting scroll end plate, and the pin crank can be made extremely small. The balance weight can be set to the minimum. FIG. 3 shows a structure in which a balance weight is attached to the structure of the present invention.

[0010]

In the balanced scroll fluid machine according to the present invention, the total weight of the revolution-related parts on the side of the three orbiting scrolls and the revolution on the side of the five eccentric wheels are related via the side and the side of the eccentric ring of the 3c orbiting scroll end plate. All parts have the same weight, and
Since the 1 and 12 revolution radii are the same as those of the revolving parts having the same dimensions, the center of gravity of the whole exists at the four drive shaft centers. Therefore, balance weights are not required for the four drive shafts in the revolution body. Therefore, it is a useful invention that has a great effect with the feature that the configuration size of the balance weight is unnecessary, vibration does not occur, and the cost can be greatly reduced in combination with the simplification of the configuration and assembly. is there.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll fluid machine having a conventional orbiting scroll structure.

FIG. 2 is a vertical cross-sectional view of a balanced scroll fluid machine having an orbiting scroll structure according to the present invention.

FIG. 3 is a vertical cross-sectional view in which balance weights are attached in the balanced scroll fluid machine according to the present invention.

[Explanation of symbols]

1-fixed scroll 2-housing 2a-pin crank 3-orbiting scroll 3a-orbiting scroll tooth, wrap portion 3b-fixed scroll tooth, wrap portion 3C-orbiting scroll end plate 3d-boss on the back of the end plate Part 4 ...... Drive shaft 5 ...... Eccentric ring 7 ...... Bearing 8 ...... Compression chamber 9 …… Suction port 10 …… Discharge port 11 …… Motor 12 …… Balance weight l1, l2 …… Rotation radius dimension

Claims (2)

[Claims] 1. A fixed scroll and a casing, an orbiting scroll, and an eccentric ring. The orbiting scroll has a pin-crank system as a mechanism for preventing its rotation and revolving. In a scroll fluid machine in which scroll teeth are provided to form a wrap portion, and the compression chamber formed by the wrap portion is compressed toward the center from the outer periphery, a bearing is fitted on the outer peripheral surface of the boss portion on the rear surface of the end plate of the orbiting scroll. An eccentric wheel is mounted, and a drive shaft is fitted in an eccentric position of the gyration center of gravity of the eccentric wheel and the revolution radius dimension. The orbiting scroll teeth, the orbiting scroll end plate, and the orbiting center of gravity of the pin crank are formed in the eccentric position with a radius of 90 ° in the opposite direction about the drive axis. Method, balance type scroll fluid machine characterized in that the balance structure by weight is balanced in the revolving body of the end plate boss portion, bearing, eccentric ring, and orbiting scroll teeth, orbiting scroll end plate, and pin crank. . 2. A weight and an orbital radius dimension about a drive shaft center,
In a balance structure between the end plate rear boss portion, the bearing, the eccentric ring and the orbiting scroll teeth, the orbiting scroll end plate, and the pin crank, a balance weight is attached to one point on the drive shaft. A balanced scroll fluid machine according to the first aspect.