JPH01257786A - Balance device for multiple cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To miniaturize and lighten balancers installed on a rotor by displacing the eccentric portion of each rotary compression element toward the center in the axial direction of the plural sets of rotary compression elements. CONSTITUTION:Two sets of rotary compression elements 4, 5 consist of cylinders 8, 9 an intermediate partition board 10 held between these cylinders, eccentric portions 11, 12 integrally provided on a rotary shaft 2 with their rotation angles being shifted 180 deg. from each other, rollers 13, 14 rotated in the cylinders 8, 9 while being fitted on the outside of these eccentric portions respectively, and an upper bearing portion 15 and a lower bearing portion 16 which rotatably support the rotary shaft 2 while closing the openings of the cylinders 8, 9 respectively. The eccentric portions 11, 12 are displaced toward the intermediate partition board 10. The unbalanced force between the two sets of rotary compression elements 4, 5 are offset by an upper balancer 17 and a lower balancer 18 installed on a rotor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement of a balance device for a multi-cylinder rotary compressor.

〉Conventional technology A conventional multi-cylinder rotary compressor is, for example, the Utility Model Opened in 1988-1119.
It is constructed as shown in Japanese Patent No. 84. Here, a conventional example will be explained with reference to this publication. In Fig. 4, 50 is a central partition plate, and cylinders 5 are placed on both upper and lower sides of the partition plate.
1.52 are disposed, and within these cylinders are eccentric portions 54.55 provided adjacent to the common rotating shaft 53, respectively;
Rollers 5 are rotatably fitted into these eccentric parts, respectively.
6.57 is stored. 58.59 is the rotating shaft 53
These are an L-portion paranza and a lower balancer, which are respectively provided on the upper and lower end surfaces of the rotor 61 in the electric element 60 fixed to the motor-driven element 60.

In the balance device for a multi-cylinder rotary compressor having this structure, the eccentric rotation weight consisting of the eccentric parts 54 and 55 of the rotating shaft 53 and the rollers 56 and 57 fitted to these eccentric parts,
A -F section balancer 58 and a lower balancer 59 are attached to the rotor 6 to maintain dynamic balance and static balance of the compressor.

(C) Problems to be Solved by the Invention However, in a two-cylinder rotary compressor, the locations where the unbalanced forces of the two sets of rotary compression elements are generated are shifted in the axial direction, and a moment is generated due to the positional fluctuation. If the eccentric rotating weight parts on which the unbalanced rotating compression element acts are far apart in the axial direction, the moment will increase and there will be a problem that the weights of the upper balancer 58 and the lower balancer 59 will have to be increased. Ta.

This invention solves the above-mentioned problems, and aims to achieve multiple reductions in size and weight.

(d) Means for Solving the Problems This invention provides a plurality of sets of rotary compression elements superimposed in the axial direction of the rotary shaft, and an eccentric portion of each rotary compression element is aligned with the axis of the plurality of sets of rotary compression elements. It is shifted toward the center of the direction.

In this invention, a plurality of sets of rotary compression elements are provided one on top of the other in the axial direction of a rotating shaft, and a recess is provided in the roller of each of the rotary compression elements on a side far from the center in the axial direction of the plurality of sets of rotary compression elements. It is something.

This invention provides a plurality of sets of rotary compression elements stacked one on top of the other in the axial direction of the rotary shaft, and a center of gravity of the eccentric part of each of the rotary compression elements is placed near the center of the plurality of sets of rotary compression elements in the axial direction. It has a recess that allows it to be deflected.

(E) By deviating the action toward the center, the difference in the axial position of the eccentric rotating weight part, which is affected by the unbalanced force generated on each rotating compression element, can be reduced, and the weight of the balancer attached to the rotor can be reduced. It was designed so that

Example) The present invention will be explained below based on the example shown in FIGS. 1 to 3.

Reference numeral 1 denotes a closed container, in which an electric element 3 having a rotating shaft 2 is housed on the upper side, and two sets of rotary compression elements 4 and 5 driven by the rotating shaft 2 of this electric element are housed on the lower side. ing. The electric element 3 is composed of a stator 6 and a rotor 7 inserted into the rotating shaft 2 inside the stator. 2
The set of rotary compression elements 4 and 5 includes cylinders 8 and 9, an intermediate partition plate 10 held between the cylinders, and an eccentric portion 11 that is integrally provided on the rotating shaft 2 and whose rotation angle is shifted by 180°.
, 1.2, rollers 13 and 14 that are fitted on the outside of these eccentric parts and rotate within the cylinders 8 and 9, and a rotating shaft 2.
It is comprised of a bearing part 15 and a lower bearing part 16. An upper balancer 17 and a lower balancer 18 are attached to both ends of the rotor 7.

The eccentric portions 11, 12 are provided offset toward the intermediate partition plate 10. Further, the eccentric portion 11.12 is provided with holes 19.20 having different diameters that penetrate in the direction of the axis j of the rotating shaft 2 and have a smaller diameter on the intermediate partition plate 10 side. roller 1
3.14 has an annular recess 2 on the side far from the intermediate partition plate 10.
1 and 22 are provided.

In the multi-cylinder rotary compressor 7<lance device configured as described above, the unbalanced force of the two sets of rotary compression elements 4 and 5 is caused by the upper balancer 17 and the lower balancer 1 attached to the rotor 7.
It is canceled out with 8. The static balance and dynamic lance at this time are the following formula 0%. However, m: Weight of eccentric rotation between the lower eccentric part and the roller, m2: Weight of eccentric rotation between the upper eccentric part and the roller. , m3: weight of the lower balancer, m4 = weight of the upper balancer, rl: radius of rotation of the lower eccentrically rotating weight, r2: radius of rotation of the upper eccentrically rotating weight, r3: radius of rotation of the lower balancer, r4 = upper balancer radius of rotation, L, - distance from the reference point to the lower eccentric rotating weight, L2: distance from the reference point to the upper eccentric rotating weight, L, distance from the second reference focus to the lower balancer, L4 = reference standard distance from to the upper balancer, W: rotational angular velocity, and since the eccentric rotational weight of the two sets of rotary compression elements 4 and 5 and this rotation radius are substantially the same, mlr, =
m, r hold true, and from the static balance formula ■, m, r4
= m3r3. Therefore, from the dynamic balance equation ■, m
, r, (L, -L=)=m, r-<L, -L-). Since L4-L is determined by the size of the rotor 7, it is constant, and the difference (L +
-L2>, the weight of the upper balancer 17 and the lower balancer 18 can be reduced.

That is, the two sets of rotary compression elements 4 and 5 respectively deviate the eccentric portions 11 and 12 of the rotating shaft 2 toward the intermediate partition plate 10, and provide holes 19 and 20 with different diameters in these eccentric portions. The center of gravity is shifted toward the intermediate partition plate 10, and the rollers 13 and 14 are placed on the intermediate partition plate 1.
By shifting the center of gravity of this roller toward the intermediate partition plate 10 using the annular recesses 21 and 22 provided on the side far from zero, the center of gravity of the eccentric rotation weight of the eccentric portion 11.12 and the roller 13.14 can be adjusted. By bringing them close together, the moment generated due to the difference in position is reduced, and the weight of the upper balancer 17 and lower balancer 18 can be reduced.

Moreover, by reducing the weight of the upper balancer 17 and the lower balancer 18, the centrifugal force that acts during operation is reduced, and the bending of the rotating shaft 2 is reduced.

In this invention, by bringing the eccentric rotating weight parts that apply unbalanced forces in opposite directions of the two sets of rotating compression elements 4 and 5 close to each other, the moment generated due to the difference in position can be reduced. The upper balancer 17 and the lower balancer 18, which are attached to the rotor 7 in order to cancel moments, can be made of lightweight materials.

(G) Effects of the Invention The balancing device for a multi-cylinder rotary compressor of the present invention shifts the center of each unbalanced force acting on a plurality of sets of rotary compression elements toward the center in the axial direction of these rotary compression elements. Therefore, by bringing the centers of the eccentric rotating weight parts where each unbalanced force acts closer together, the moment due to the difference in position in the axial direction can be reduced, and the rotor balancer that cancels out this moment can be made smaller and lighter. It is possible.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show the present invention, Fig. 1 is a sectional view of a multi-cylinder rotary compressor, Fig. 2 is an enlarged sectional view of main parts, and Fig. 3 is a balance action of the multi-cylinder rotary compressor. FIG. 4 is a sectional view of a conventional multi-cylinder rotary compressor. DESCRIPTION OF SYMBOLS 1... Sealed container, 2... Rotating shaft, 3... Electric element, 4, 5... Rotating compression element, 8, 9...
・Cylinder, 11.12... Eccentric part, 13.
14...roller, 19.20...hole, 21
．． 22... Annular recess. Figure 1

Claims (1)

[Claims] 1. An electric element having a rotating shaft and a plurality of rotational compression elements driven by the rotational axis of the electric element are housed in a closed container, and the rotational compression element is connected to a cylinder and rotated. In a multi-cylinder rotary compressor configured with an eccentric part of a shaft and a roller that is fitted on the outer periphery of the eccentric part and rotates inside the cylinder, a plurality of sets of rotary compression elements are provided superimposed in the axial direction of the rotary shaft, A balance device for a multi-cylinder rotary compressor, characterized in that the eccentric portion of each rotary compression element is shifted toward the center in the axial direction of the plurality of rotary compression element sets. 2. An electric element having a rotating shaft and a plurality of sets of rotating compression elements driven by the rotating shaft of the electric element are housed in a closed container, and the rotating compression element is connected to a cylinder, an eccentric part of the rotating shaft, In a multi-cylinder rotary compressor configured with a roller fitted on the outer periphery of the eccentric part and rotating inside the cylinder, a plurality of sets of rotary compression elements are provided superimposed in the axial direction of the rotary shaft, and each of the rotary compression A balancing device for a multi-cylinder rotary compressor, characterized in that a roller of the element is provided with a concave portion on a side far from the center in the axial direction of a plurality of sets of rotary compression elements. 3. An electric element having a rotating shaft and a plurality of sets of rotating compression elements driven by the rotating shaft of the electric element are housed in a closed container, and the rotating compression element is connected to a cylinder, an eccentric part of the rotating shaft, In a multi-cylinder rotary compressor configured with a roller fitted on the outer periphery of the eccentric part and rotating inside the cylinder, a plurality of sets of rotary compression elements are provided superimposed in the axial direction of the rotary shaft, and each of the rotary compression A balancing device for a multi-cylinder rotary compressor, characterized in that an eccentric portion of the element is provided with a recess for shifting the center of gravity of the eccentric portion toward the center in the axial direction of a plurality of sets of rotary compression elements. 4. A balancing device for a multi-cylinder rotary compressor according to claim 3, wherein the eccentric portion is provided with holes having different diameters in the axial direction. 5. An electric element having a rotating shaft and a plurality of sets of rotating compression elements driven by the rotating shaft of the electric element are housed in a closed container, and the rotating compression element is connected to a cylinder, an eccentric part of the rotating shaft, In a multi-cylinder rotary compressor configured with a roller that is fitted around the outer periphery of the eccentric part and rotates within the cylinder, multiple sets of rotary compression elements are provided superimposed in the axial direction of the rotating shaft, and each of the superposed rotary compression Each eccentric portion is offset toward the center in the axial direction of the element, and a recess is provided in the eccentric portion to offset the center of gravity of the eccentric portion toward the center, and
A balancing device for a multi-cylinder rotary compressor, characterized in that a recess is provided on the side far from the center in the axial direction of each rotary compression element superimposed on a roller.