JPH02248662A - Vibration damping device of rotary compressor - Google Patents

Abstract

PURPOSE:To obtain a sufficient vibration damping effect even if the rotating frequency is changed by fixing one end part of a tension coil having leg parts extending at right angles to the winding central axis from the both end parts of the winding to the fixture of a sealed case having a compressing element part and an electric motor part contained therein, and the other end part to an inertial body. CONSTITUTION:A sealed case 2 is vibrated by the operation of a compressor, but by vibrating the inertial body 15 of a dynamic vibration reducer 14 in the opposite phase to the vibration of the sealed case 2, the vibration of the sealed case 2 is damped. A connecting part 16 is formed of a tension coil spring having initial tension and arm parts 16a, 16b. When a space is formed between windings, bending rigidity is changed and the peak width of the natural vibration of the dynamic vibration reducer 14 is widened, causing damping effect. Therefore, the peak width of the maximum damping frequency is widened, and vibration damping effect can be obtained in a wide frequency band. Notch parts 17b, 15b and projection parts 17c, 15c are provided on the top ends of the protruding parts 17a, 15a of a fixture 17 and the inertial body 15, respectively, whereby the natural frequency of the dynamic vibration reducer 14 can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibration damping device for a rotary compressor used in refrigeration equipment and the like.

BACKGROUND OF THE INVENTION In recent years, compressors used in refrigeration equipment, etc. have shifted from reciprocating type to rotary type from the viewpoint of energy and space saving, and beam vibration absorbers have been used as vibration damping devices for rotary type compressors. It is used. As conventional technology, for example,
As shown in Japanese Patent Publication No. 58-5486, there is a vibration damping structure for a rotary hermetic electric compressor.

Hereinafter, an example of the vibration damping structure of the conventional rotary compressor mentioned above will be explained with reference to the drawings.

FIG. 8 is a partial cross section of a conventional rotary compressor.

In the figure, 1 is a rotary compressor, and 2 is a sealed case. 3 is a stator of the motor, which is fixed to the sealed case 2 with a shrink fit. 4 is a rotor of the motor, which is connected and fixed to the crankshaft 6 with a shrink fit. A piston 6 is rotatably fixed to an eccentric portion of the crankshaft 6. 7 is a cylinder with lower bearings 8 at both ends. An upper bearing 9 is provided, and the outer peripheral portion is welded and fixed to the sealed case 2. Reference numeral 1o denotes a discharge cover, which is press-fitted and fixed to the upper bearing 9. Reference numeral 11 designates a dynamic vibration absorber, which includes an inertial body 12 and a shaft-shaped connecting portion 1 with this inertial body 12 provided at an end 13a.
3, and the other end 13b of the connecting portion 13 is fixed perpendicularly to the wall surface of the sealed case 2 by resistance welding. Further, the dynamic vibration absorber 11 is a rotary compressor 1.
The maximum damping frequency generated by achieving the natural vibration of the support system of the rotary compressor 1 itself and the first-order natural vibration of the dynamic vibration absorber 11 due to the support and fixation of the rotary compressor 1 is the rotation of the rotary compressor 1. Inertial body 12 so as to almost match the frequency.
0 weight, shape, and length of the connecting part 13.

Adjusting the diameter of the cross section.

The operation of the vibration damping device for a rotary compressor configured as described above will be described below.

When compressing the refrigerant in the cylinder 7, the pressure in the cylinder 7 fluctuates greatly during one rotation of the crankshaft, causing a fluctuation in angular velocity at 160 rotations of the crankshaft, and as a reaction, a force is applied to the cylinder 7, etc. . Therefore, vibrations occur in the rotational direction around the axis of the crankshaft 5, and the sealed case 2 vibrates greatly. However, by adjusting the natural frequency so that the maximum damping frequency almost matches the rotational frequency of the rotary compressor 1, the inertial body 12 of the dynamic vibration absorber 11 installed in the sealed case 2 causes vibrations opposite to the vibration of the sealed case 2. By vibrating in phase, the dynamic vibration reducer 11 supplies a reaction torque to the closed case 2 via the connecting part 13 of the dynamic vibration absorber 11 at the installation location in the closed case 2,
It dampens vibrations.

Problems to be Solved by the Invention However, in the above configuration, the peak (Q value) of the natural vibration of the dynamic vibration absorber 11 is sharp, and this occurs due to coupling with the natural vibration of the support system of the rotary compressor 1 itself. The peak of the maximum attenuation frequency (Q value) also becomes sharper. Therefore, when the maximum damping frequency and the rotational frequency of the rotary compressor 10 match, the damping effect is extremely large.
Due to changes in the natural vibration due to manufacturing variations, etc., the maximum damping frequency caused by coupling with the natural vibration of the support system of the rotary compressor 1 itself changes, and the maximum damping frequency and that of the rotary compressor 1 change. When the frequency difference from the rotational frequency becomes large, the vibration damping effect becomes insufficient.

Furthermore, stress is concentrated on the end portion 13b of the connecting portion 13 due to the deformation of the connecting portion 13, so that it may break due to fatigue caused by vibration or impact.

In view of the above-mentioned problems, the present invention prevents the vibration damping effect from decreasing due to fluctuations in the rotational frequency of a rotary compressor, manufacturing variations, etc., and prevents damage to the dynamic vibration absorber due to fatigue caused by vibration or impact. It is.

Means for Solving the Problems In order to solve the above problems, the vibration damping device for a rotary compressor of the present invention includes a puller having arms extending from both ends of the winding in a direction substantially perpendicular to the winding central axis. It has a connecting part made of a coiled spring, and a cylindrical protruding part that has a protruding part on the side where the connecting part is inserted and fixed into one end of the winding part and the tip is separated from the connecting part of the notched part of the notched bracket. Further, the arm extending from one end of the winding of this connecting part is fixed, and a fixture is attached and fixed to a closed case in which the compression element part or the compression element part and the electric motor part are fixedly housed, and the said connecting part is fixed. is inserted and fixed to the other end of the winding, has a notch at the tip and a protrusion on the side separating from the connecting part of this notch, and further has an end of the winding. It is equipped with an inertial body to which an arm extending from the body is fixed.

Effect: With the above-described configuration, the present invention absorbs vibrations generated during operation of a rotary compressor by causing a dynamic vibration absorber fixed to the rotary compressor main body to vibrate in an opposite phase to the vibrations of the rotary compressor. By supplying a reaction torque to the mold compressor and attenuating it, and by using a tension coil spring as the connection between the sealed case and the inertial body, vibrations and shocks at the end of the connection that is fixed to the sealed case are damped. In addition to reducing the stress caused by the deformation that occurs in
By inserting and fixing the cylindrical protrusion provided on the fixture and the cylindrical protrusion provided on the inertial body to both ends of the connection part, the winding can be tightly attached even at the ends of the connection part. Stable bending rigidity of the connecting part can be obtained. In addition, by notching the tips of the protruding parts of the fixing device and the inertial body, and further providing a protruding part on the side of these notches that separates from the connecting part, the connecting part and the protruding part can be stabilized. The separation part from the connecting part can be fixed in a fixed position, and the connecting part, the fixture, and the inertial body can be firmly fixed by fixing the arms provided at both ends of the connecting part to the fixture and the inertial body. I can do it.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Incidentally, in order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

1 to 7 show an embodiment of a vibration damping device for a rotary compressor according to the present invention.

In the figure, reference numeral 14 denotes a dynamic vibration absorber, which is composed of an inertial body 16, a connecting part 16 made of a tight tension coil spring having an initial tension, and a fixture 17. 15a is a cylindrical protrusion provided on the inertial body 16, 15b is a notch at the tip of the protrusion 15a, 17a is a cylindrical protrusion provided on the fixture 17, and 17b is a cutout of the protrusion 17a. This is the notch at the tip.

The fixture 17 is fixed to the sealed case 2 by welding.

The protrusion 17a of the fixture 17 is press-fitted into the end 16a of the connecting portion 16, and a hook-shaped arm 16b extending from the end 16a in a direction substantially perpendicular to the winding center axis 16e is inserted and fixed with a bolt 18. Thus, it is fixed to the fixture 17. Reference numeral 17a denotes a protrusion provided in the notch 17b of the protrusion 17a, corresponding to the separation part 161 from the protrusion 17a of the connecting part 16.

Furthermore, the connecting portion 16 has an inertial body 1 at the other end 16a.
It is fixed to the fixture 17 by press-fitting the protruding part 15a of 6 and further inserting and fixing the hook-shaped arm part 1ed extending from the end part 16c in a direction substantially perpendicular to the winding center axis 16e with the port 19. . 15G is a separation part 16 from the protrusion part 15a of the connecting part 16 in the cutout part 16b of the protrusion part 15a.
This is a protrusion provided corresponding to g.

The winding center axis 16e of the connecting portion 1e is orthogonal to the rotating shaft 2o.

Furthermore, the dynamic vibration absorber 14 is connected to the connecting portion 16 so that the maximum damping frequency generated by achieving the natural vibration of the support system of the rotary compressor and the natural vibration of the dynamic vibration absorber 14 almost matches the rotational frequency of the compressor 1. The shape of the inertial body 15 and the weight and shape of the inertial body 15 are adjusted.

The operation of the vibration damping device for a rotary compressor configured as described above will be described below.

When compressing refrigerant in cylinder T, crank shirt)
As the pressure inside the cylinder 7 changes greatly during one rotation of the crankshaft 6a, the angular velocity changes in the rotation of the crankshaft 6a, and as a reaction, a force is applied to the cylinder 7 and the like. Therefore, vibration occurs in the rotational direction around the axis of the crank shirt 6a, causing the sealed case 2 to vibrate greatly. At this time, the maximum damping frequency generated by achieving the natural vibration of the dynamic vibration absorber 14 installed in the sealed case 2 and the natural vibration of the support system of the rotary compressor 1 itself is set to approximately match the rotational frequency of the rotary compressor 1. Because of this adjustment, the inertial body 16 of the dynamic vibration absorber 14 vibrates in the opposite phase to the vibration of the sealed case 2. Therefore, a reaction torque is supplied to the sealed case 2 via the connecting portion 16 of the dynamic vibration absorber 14 and the fixture 17 fixed to the sealed case 2, thereby damping the vibration of the sealed case 2.

Furthermore, by using a tension coil spring as the connecting portion 16, the stress at the fixed end 16d for the same displacement is smaller than that of a beam made of the same material and the same wire diameter, and fatigue due to vibration and stress due to impact can be reduced. Breakage of the fixed end 1ed due to vibration or impact can be prevented, and the reliability of the dynamic vibration absorber 14 can be improved.

Moreover, by making the connecting portion 16 a tension coil spring with initial tension, the amount of deformation in the bending direction of the connecting portion 16 increases during one cycle of vibration, and when a gap occurs between the windings, the bending rigidity decreases. The bending rigidity changes during one cycle, and the peak width of the natural vibration of the dynamic vibration absorber 14 becomes wider (the Q value becomes larger), resulting in a so-called damping effect. Therefore, the peak width of the maximum damping frequency generated by achieving the natural vibration of the dynamic vibration absorber 14 and the natural vibration of the support system of the rotary compressor 1 becomes wider, and a vibration reduction effect can be obtained in a wide frequency band.

Furthermore, fixtures 17 are attached to both ends 16a and 16b of the connecting portion 16.
By inserting and fixing the protruding part 17a of the inertial body 16 and the protruding part 15a of the inertial body 16, the end part 16a is fixed.

16c, the windings can be brought into close contact with each other, and the connection part 1
In addition to obtaining stable bending rigidity of 6, protrusions 17a and 16a (switching parts 17b and 15b are provided at the tip of D).

Furthermore, by providing the protrusions 17c and 15a, separation parts 16f and 16 between the protrusions 17a and 15a and the connecting part 16
9 can be reliably fixed at the positions of the protrusions 17c and 15a, and the natural frequency of the dynamic vibration reducer 14 can be stabilized. Furthermore, both ends 16a of the connecting portion 16,
By fixing the hook-shaped arms 16b and 16d provided on the hook 16c to the fixture 17 and the inertial body 16 using the ports 19 and 18, the connecting part 16, the fixture 17, and the inertial body 16 are firmly fixed. be able to.

The same effect can be obtained by similarly fixing the inertial body 15, the connecting portion 16, and the fixing member 17 to the compressed front portion of the sealing case 2.

Effects of the Invention As described above, the present invention provides a connecting portion made of a tension coil spring having arms extending from both ends of a winding wire in a direction substantially perpendicular to the winding center axis, and one end of the winding portion of this connecting portion. The arm part has a cylindrical protrusion that is inserted into and fixed to the part, has a notch at the tip, and has a protrusion on the side of the notch that separates from the connecting part, and further extends from one end of the winding of the connecting part. The compressor element section or the compressor element section and the motor section are fixedly housed in a sealed case, and the fixed fixture is inserted and fixed into the other end of the winding of the connecting section, and the tip is notched. The notch has a cylindrical protrusion with a protrusion on the side that separates from the connecting part, and further includes an inertial body to which an arm extending from the end of the winding is fixed, thereby achieving dynamic vibration absorption. It forms a structure that damps the vibrations that occur during operation of the rotary compressor, and the damping effect provides a vibration reduction effect over a wide frequency band, so it is possible to reduce the vibration caused by changes in the rotational frequency due to changes in the operating conditions of the rotary compressor. Even if there is a vibration, a sufficient vibration reduction effect can be obtained, the dynamic vibration absorber can be prevented from being destroyed by vibration or impact, and a stable vibration reduction effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a side view of a vibration damping device for a rotary compressor showing an embodiment of the present invention, Fig. 2 is a side view of a connecting part of the vibration damping device, and Fig. 3 is a fixture of the vibration damping device. side view, 4th
The figure is a front view of the fixture, Figure 6 is a side view of the inertial body of the vibration damping device, Figure 6 is a front view of the inertial body, and Figure 7 is a rotary compression type equipped with the vibration damping device. Machine cross section, foil 8
The figure is a sectional view of a rotary compressor equipped with a conventional vibration damping device. 2... Sealed case, 14... Dynamic vibration absorber, 15... Inertial body, 16... Connection part,
17... Fixture. Name of agent: Patent attorney Guntaku Awano and 1 other person

Claims (1)

[Scope of Claims] A connecting part made of a tension coil spring having arms extending from both ends of the winding in a direction substantially perpendicular to the winding central axis; , has a cylindrical protrusion with a notch at the tip and a protrusion on the side of the notch that separates from the connecting part, and further fixes an arm extending from one end of the winding of the connecting part, Compression element part or
A fixture is attached and fixed to a sealed case in which the compression element part and the electric motor part are fixedly housed, and a fixture is inserted and fixed into the other end of the winding of the connecting part, and has a notch at the tip and a connecting part of the notch part. A vibration damping device for a rotary compressor, which has a cylindrical protrusion having a protrusion on the separating side, and further includes an inertial body to which an arm extending from the end of the winding is fixed.