KR970006717Y1 - Balancer of scroll compressor - Google Patents

Abstract

none

Description

Counterweight Installation Structure of Scroll Compressor

1 is a partial cutaway perspective view of a general scroll compressor for applying the present invention

2 (a) is a sectional front view showing the weight installation structure of the conventional scroll compressor

(B) is a perspective view of the weight of (a)

Figure 3 is a front sectional view showing an embodiment of the present invention

4 is a front view and a plan view of part of the embodiment;

Figure 5 (a) is a force balance moment diagram by the weight of the present invention

(B) is the conventional force balance moment diagram

Explanation of symbols on the main parts of the drawings

10: axis of rotation 11: crank

21: rotor 30: turning scroll

40: fixed scroll 80: balance maintaining means

81: first balance weight 82: second balance weight

83: third balance weight

The present invention relates to a counterweight installation structure of a scroll compressor, and more particularly, by installing a counterweight to disperse eccentric loads generated on a rotating shaft driving a rotating scroll in many places, it minimizes the vibration generated during driving and A counterweight installation structure of a scroll compressor that can be miniaturized.

The general scroll compressor has a rotating shaft 2 coupled to a rotating shaft 1 driven and fixed to the rotor of the electric motor 4 as shown in FIG. 1, and a crank 1 'formed at one end of this rotating shaft. ) And a fixed scroll (3) which is assembled to be inclined at 180 degrees with respect to a turning scroll having an involute tooth.

The swinging scroll 2 rotated by the rotating shaft does not change the angular speed by the Oldham's Ring, that is, it moves relative to the fixed scroll 3 at a constant turning radius without the rotating scroll rotating. Compressing and discharging the refrigerant by a compression action sequentially formed between the two scrolls.

At this time, a conventional counterweight installation structure for dispersing the eccentric load generated on the rotating shaft 1 by the driving of the swinging scroll 2 press-fitted to the crank 1 is shown as in FIG. 2A. .

The counterweight is mounted at two places of the upper part (U) of the rotating shaft and the lower part (L) to which the rotor is joined, and the upper counterweight (FUB ') is required to be larger than the eccentric load generated by the turning scroll and the crank. The volume becomes large, as well as occupy a lot of installation space, there is a problem that the device is excessive, there is a problem causing bending or vibration by applying a torsional stress to the rotor under the axial load of the eccentric load during high speed rotation.

On the other hand, the upper side counterweight (FUB ') as shown in Fig. 2 (b) is integral with the weight member 5' in the form of a semi-circular arc having a rectangular cross section on the outer peripheral surface of the ring body 5 coupled to the rotating shaft Because of the structure formed by the present invention, there is a defect in reducing the power transmission efficiency as the fluid resistance is caused by the weight member of the four-wheeled rectangle during the high-speed rotation of the balance weight bonded to the rotating shaft.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a counterweight installation structure of a scroll compressor for distributing eccentric loads other than the origin of the rotation shaft to at least three places.

Another object of the present invention is to provide a counterweight installation structure of a scroll compressor that can prevent the occurrence of fluid resistance due to the counterweight and reduce the size of the compressor by changing the shape of the counterweight.

The present invention, one of the upper balance of the rotary shaft and the lower portion of the rotor coupled to the rotary shaft and each one of the counterweights attached to each other at least at three locations of the rotary shaft to distribute and absorb the partial load is generated when driving the rotating scroll By forming the first balance weight on the upper part of the rotating shaft that provides a concentrated response to the eccentric load into a cylindrical shape, and installing the through hole through which the rotating shaft is coupled to the eccentric position of the cylindrical balance weight, the volume of the balance weight can be reduced and It is characterized by preventing the occurrence of fluid resistance during high-speed rotation of the.

3 and 4 show an embodiment of the present invention, in which the reference numeral 10 is a rotating shaft, and the rotating shaft 10 is attached to the frame 110 installed in the main body 100 in a closed state. It is supported, and the rotating shaft 10 which faces the lower part of this frame is press-fitted and fixed to the rotor 21 of the electric motor 20. As shown in FIG.

The crank 11 which is eccentric with respect to the center of rotation of the rotary shaft 10 is provided in the incident portion of the rotary shaft 10 protruding upward of the frame 110, and the crank has a fixed scroll 40 having an involute tooth. The corresponding swing scroll 30 is coupled.

A hardening hole 61 is provided in the hard disk of the revolving scroll 30 to communicate the compression chamber 50 and the back pressure chamber 60. The lower part of the revolving scroll 30 provides an Oldham's function. The ring body 70 is provided.

On the other hand, the rotating shaft 10 is provided with a balance holding means 80 corresponding to the eccentric load, the balancing means is the first balance weight 81 and the rotor 21 which is attached to the upper position of the rotating shaft 10 And a second balance weight 82 mounted on the top of the third balance weight and a third balance weight 83 mounted on the bottom of the rotor 21.

At this time, the first balance weight 81 is formed of an eccentric cylindrical body, the center of gravity of the first balance weight and the center of gravity of the second balance weight 82 to match the same position with respect to the rotation axis 10, The center of gravity of the third balance weight (83) is mounted to match the crank (11) located opposite to the center of gravity of the balance weight (81, 82).

Therefore, the center of gravity of the first balance weight 81 and the second balance weight 82 coincides with the center line of the rotation shaft 10, and the weight of the third balance weight 83 and the crank 11 at positions opposite to these balance weights. The rotation shaft 10 is rotated in the state in which the center coincides.

Therefore, the present invention as described above, the rotating shaft 21 and the rotating shaft 10 is integrally rotated by the driving of the electric motor 20, the rotating scroll 30 is coupled to the crank 11 of the upper end by the rotation of the rotating shaft (30). Is rotated, whereby the refrigerant introduced through the suction pipe 51 passes through the compression chamber 50 and the back pressure chamber 60 and the distribution hole 61 formed between the fixed scroll 40 and the swing scroll 30. Compressed and discharged.

At this time, the ring body 70 installed below the swing scroll 30 causes the swing scroll to move relative to the fixed scroll 40 at a constant turning radius without rotation.

The rotating shaft 10 rotated in this way is subjected to an eccentric load by the crank 11 and the turning scroll 30 eccentric with respect to the center of rotation, and the eccentric load generated at this time is the rotating shaft 10 and the rotor ( 21 is offset and dispersed by the balancing means 80 attached to 21).

That is, when the force equilibrium moment (Moment) is obtained based on the point A for the eccentric load (Fs) applied to the rotating shaft 10 as shown in FIG.

Fs (ℓ1 + ℓ2 + ℓ3) = FUB (ℓ1 + ℓ2) + FMB (ℓ1)

(Where, l1> l2> l3, FUB: first balance weight, FMB: second balance weight) and the eccentric load is dispersed regardless of the third balance weight FLB.

On the other hand, when the conventional eccentric load Fs' is obtained under the above conditions as shown in Fig. 5 (b),

Since Fs (ℓ1 + ℓ2) = FUB '(ℓ1), the first balance weight 81 can reduce the weight and volume by the second balance weight 82 as compared to the conventional balance weight FUB'. It provides a condition to reduce the size of 100).

In addition, the equilibrium for matching the center of gravity of the first balance weight (81) and the second balance weight (82) is the force balance obtained when the second balance weight (82) is mounted in the opposite direction as the dotted line in FIG. This is due to the result of the moment.

That is, since the relationship of Fs (l1 + l2 + l3) + FUB (l1) + FUB is established, and thus the first balance weight 81 should be larger than the conventional balance weight FUB ', the adverse effect is caused.

Since the first balancing weight 81 is cylindrical as shown in FIG. 4 (b), and the through hole 81 'through which the rotating shaft 10 is press-fitted and fixed is biased to one side, the rotating shaft 10 In this case, the fluid resistance can be minimized even at high speed of rotation, thereby increasing the driving efficiency of the compressor.

As such, the present invention disperses and offsets the eccentric load by the balance maintaining means attached to the rotating shaft and the rotor rotated integrally therewith, thereby reducing the deformation and vibration that may occur on the rotating shaft. The shape and structure is improved, thereby reducing the size of the compressor, while increasing the driving efficiency.

Claims (3)

At one end, the rotor 21 of the electric motor 20 is press-fitted and fixed, and the crank 11 provided with the other end has a rotary shaft 10 coupled with a turning scroll 30 corresponding to the fixed scroll 40, and the rotary shaft. A counterweight installation structure of a scroll compressor, characterized in that a balance maintaining means (80) is mounted on at least three places of (10). According to claim 1, wherein the balancing means (80) and the first balance weight (81) attached to the upper portion of the rotating shaft 10, the second balance weight (82) attached to the upper portion of the rotor 21, A counterweight installation structure of a scroll compressor, characterized in that it comprises a third counterweight (83) attached to the lower part of the electron (21). 3. The balance weight mounting structure of a scroll compressor according to claim 2, wherein the first balance weight (81) has a cylindrical shape and a hole (81 ') through which the rotary shaft (10) is press-fitted and fixed is installed at an eccentric position thereof. .