JP2001107857A - Vibrating compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration of a vibrating compressor used for a refrigerator and an air conditioner. SOLUTION: This vibrating compressor is equipped with a plurality of dynamic vibration absorbers 20 which comprises a weight 18 and a spring 19 elastically deformable in the axial direction of a piston 5 and is mounted in a hermetic casing 1. A vibration reducing effect according to the vibration of a mounting position can be obtained, the whole vibration of the hermetic casing 1 can be reduced, and the vibration of the compressor can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration reduction of a vibrating compressor used for a refrigerator, an air conditioner and the like.

[0002]

2. Description of the Related Art A conventional vibratory compressor is disclosed in
There is one described in JP-A-166072. Japanese Patent Application Laid-Open No. 2-998 describes a compressor using a dynamic vibration absorber.
No. 9 is disclosed. Hereinafter, the above-mentioned conventional vibration type compressor will be described with reference to the drawings.

FIG. 6 is a sectional view of a conventional vibrating compressor.

In FIG. 6, reference numeral 1 denotes a closed casing, and 2 denotes a main body. The motor 3 includes a stator 3a and a mover 3b, and the mover 3b is fixed to the piston 5. Reference numeral 6 denotes a block, and reference numeral 7 denotes a cylinder head having a low-pressure chamber 7a and a high-pressure chamber 7b. Reference numeral 10 denotes a compression chamber composed of the cylinder 4 and the piston 5. The main body 2 includes a movable element 11 composed of a mover 3b of the motor 3, a piston 5, and the like, a cylinder 4, a stator 3 of the motor 3, and the like.
a, a fixed element 12 composed of a block 6 and the like, and is elastically supported in the closed casing 1 by a suspension spring 13 (not shown) in a direction orthogonal to the reciprocating direction of the piston 5. An elastic element 14 has one end fixed to the movable element 11 and the other end fixed to the fixed element 12.

Next, the mechanism of the vibrating compressor will be described. A sine-wave AC power generated by using an inverter circuit 15 (not shown) is supplied to a mover 3 fixed to a piston.
When the coil b is energized, a thrust is generated across the magnetic field generated by the stator 3a, and the mover 3a moves in the axial direction of the piston. When the movable element 11 is displaced, the elastic element 14 is deformed, the movable element 11 is pushed in the opposite direction by the elastic force stored in the elastic element 14, and the piston 5 reciprocates in the axial direction.

The frequency of the AC power generated by the inverter circuit is given by a resonance frequency mainly determined by the mass of the movable element 11 and the spring constant of the elastic element 14, so that the spring force of the elastic element 14 is reciprocated by the movable element 11. It can be used effectively for movement.

[0007] Refrigerant gas from a cooling system (not shown) is guided to a low-pressure chamber 7a of the cylinder head 7 through a suction valve (not shown) provided in the cylinder head 7.
It reaches the compression chamber 10 in the cylinder 4. The refrigerant gas that has reached the compression chamber 10 is compressed by the reciprocating motion of the piston 5 described above. The compressed refrigerant gas is once discharged into a high-pressure chamber 7b in the cylinder head 7 via a discharge valve (not shown) provided in the cylinder head 7, and then discharged to the system.

In such a vibrating compressor, the compressor body vibrates due to the reciprocating motion of the movable element, and this vibration is transmitted to the closed casing via the suspension spring. The occurrence of vibration may be a problem, and as a countermeasure against such vibration at a constant frequency, a method of mounting a dynamic vibration absorber on the surface of a closed casing is known.

[0009]

However, in the above-mentioned conventional structure, the vibration at the position where the dynamic vibration absorber is attached to the closed casing is reduced, but the vibration at the position far from the dynamic vibration absorber may increase. .

The present invention solves the conventional problems,
An object of the present invention is to provide a compressor having a low vibration by reducing the vibration of the whole closed casing by obtaining a vibration reducing effect according to the vibration of the mounting position by mounting a plurality of dynamic vibration absorbers.

In the vibration type compressor, the operating frequency slightly changes depending on the operating conditions. However, since the resonance frequency of the dynamic vibration absorber is fixed by the spring and the weight, the vibration reducing effect of the dynamic vibration absorber depends on the operating conditions. And vibration may increase.

Another object of the present invention is to obtain a high vibration reduction effect over a wider frequency range in a position where vibration is large by mounting a dynamic vibration absorber having different weights according to a mounting position on a closed casing. Accordingly, an object of the present invention is to provide a compressor having a low vibration by exhibiting an effect of reducing vibration of a dynamic vibration absorber even when operating conditions change.

[0013] The main vibration of the vibrating compressor is generated in the reciprocating direction of the piston. However, when the piston is installed so as to reciprocate horizontally or depending on the mounting position of the suspension, vibrations other than the reciprocating direction of the piston are generated. There was a possibility.

Another object of the present invention is to reduce the vibrations in all directions by using a dynamic vibration absorber by matching the reciprocating direction of the piston of the dynamic vibration absorber with the resonance frequency in a direction perpendicular to the piston. It is to provide.

When the dynamic vibration absorber is composed of a weight and one or two coil springs, rotational vibrations other than the reciprocating direction of the piston are generated, and the vibration of the weight in the reciprocating direction of the piston is reduced, thereby reducing the vibration. The effect could be reduced. Also, when the dynamic vibration absorber is placed close to the closed casing or oil, and when vibration other than the piston reciprocating direction occurs, the weight of the dynamic vibration absorber contacts the closed casing or oil, and the effect of the dynamic vibration absorber Was significantly reduced, and the vibration was likely to increase.

Another object of the present invention is to form the dynamic vibration absorber with a weight and three or more coil springs to prevent the dynamic vibration absorber from vibrating in directions other than the reciprocating direction of the piston and to reliably operate the dynamic vibration absorber. To provide a low vibration compressor.

[0017]

In order to achieve this object, a vibratory compressor according to the present invention comprises a closed casing, a cylinder housed in the closed casing, and a piston which is inserted into the cylinder so as to be reciprocable in the axial direction. , A motor composed of a stator and a mover, a movable element composed of a mover and a piston, and a fixed element composed of a cylinder and a stator. The portion is constituted by an elastic element fixed to the fixed element, a weight and a spring elastically deformable in the axial direction of the piston, and a plurality of dynamic vibration absorbers attached to the closed casing.

Thus, a vibration reduction effect according to the vibration of the mounting position can be obtained from the dynamic vibration absorber, so that the vibration of the whole closed casing can be reduced and the vibration can be surely reduced.

Furthermore, the weight of the weight of at least one dynamic vibration absorber is different from the weight of the weight of another dynamic vibration absorber.

Thus, even when the operating frequency changes, the vibration at a position where the vibration is large is reliably reduced, so that the vibration can be reduced regardless of the change in the operating frequency.

Further, the spring constant of the spring of the dynamic vibration absorber in the reciprocating direction of the piston and the spring constant in the direction perpendicular thereto are substantially matched.

Thus, vibrations in all directions can be reduced by the dynamic vibration absorber.

Further, the dynamic vibration absorber is constituted by one weight and three or more springs.

Thus, it is possible to prevent the dynamic vibration absorber from vibrating in directions other than the reciprocating direction of the piston, to reliably operate the dynamic vibration absorber, and to reduce the vibration.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a closed casing, a cylinder housed in the closed casing, a piston reciprocally inserted into the cylinder in the axial direction, a stator and A motor composed of a mover, a movable element composed of a mover and a piston, a fixed element composed of a cylinder, a stator, etc., and a part fixed to the movable element and a part fixed to the fixed element It is composed of a fixed elastic element, a weight and a spring that can be elastically deformed in the axial direction of the piston, and has a plurality of dynamic vibration absorbers attached to a closed casing. It is possible to obtain a corresponding vibration reduction effect, which has the effect of reducing the vibration of the entire closed casing.

According to a second aspect of the present invention, in the first aspect of the present invention, the weight of at least one dynamic vibration absorber is different from the weight of the other dynamic vibration absorbers, and the position where the vibration is large is large. Thus, by obtaining a high vibration reduction effect in a wider frequency range, the vibration reduction effect of the dynamic vibration absorber is exhibited even when the operating conditions change, and the vibration is reduced.

According to a third aspect of the present invention, the spring constant of the spring of the dynamic vibration absorber according to the first aspect of the invention is substantially the same as the spring constant in the reciprocating direction of the piston. In addition, there is an effect that vibrations in all directions are reduced by the dynamic vibration absorber.

According to a fourth aspect of the present invention, the dynamic vibration absorber according to the first aspect of the present invention comprises one weight and three or more springs, and the dynamic vibration absorber comprises a weight and three or more coil springs. With such a configuration, the dynamic vibration absorber is prevented from vibrating in directions other than the piston reciprocating direction, and has an effect of reliably operating the dynamic vibration absorber.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same components as those of the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a sectional view of a vibrating compressor according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 17 denotes a stay attached to the inner wall surface of the closed casing 1, and 17a and 17b,
And 17c and 17d are opposed to each other in the axial direction of the piston 5. Reference numeral 18 denotes a weight, and stays 17a and 1
18a is provided between 7b and 18c is provided between 17c and 17d. Reference numerals 19 denote springs, one end of which is attached to the stay 17 and the other end of which is attached to the position of the weight 18 facing the stay 17. The stay 17, the weight 18 and the spring 19 constitute a dynamic vibration absorber 20.

In the dynamic vibration absorber 20a, the distance between the opposite stays 17a and 17b is such that when the weight 18a is located at the center, both the springs 19a and 19b are shorter than the natural length.
It is in a compressed state. Therefore, the weight 18a is held by the spring force of the springs 19a and 19b. Further, the spring 19 is elastically deformable in the axial direction of the piston as the weight 18 moves. Further, the sum of the weight of the weight 18a and the spring constant of the springs 19a and 19b is selected so that the resonance frequency of the dynamic vibration absorber 20a substantially matches the operating frequency of the compressor.

The operation of the vibrating compressor constructed as described above will be described below.

The movable element 11 reciprocates with respect to the fixed element 12 to perform compression. At this time, the fixed element 12 of the compressor body 2 is compressed.
Vibrates mainly in the reciprocating direction of the piston due to the reaction of the reciprocating motion of the movable element 11 and the like. The vibration of the main body 2 is transmitted to the closed casing 1 via the suspension spring 13 and the like as a vibrating force.

The resonance system consisting of the weight 18 and the spring 19 is excited by the exciting force transmitted to the closed casing 1, and the weight 18 vibrates in the reciprocating direction of the piston, whereby the dynamic vibration absorber 20 operates. At this time, the vibration force transmitted from the suspension spring 13 to the closed casing 1 and the magnitude of the acting force due to the vibration of the respective dynamic vibration absorbers 20 at the respective mounting positions become substantially equal, so that the vibration of the entire closed casing is reduced. You can do it.

Moreover, by arranging the dynamic vibration absorbers at a plurality of locations in the closed casing as described above, even if the dynamic vibration absorbers are mounted, the external dimensions of the compressor, particularly the length in the axial direction of the piston, hardly increase. When the compressor is a horizontal type, the magnitude of vibration of the closed casing varies depending on the position.However, the vibration damping effect according to the magnitude of the vibration at the mounting position can be obtained with multiple dynamic vibration absorbers. Regardless, vibration can be reduced.

As described above, the vibratory compressor of this embodiment is
A motor 3 including a closed casing 1, a cylinder 4 housed in the closed casing 1, a piston 5 reciprocally inserted in the cylinder 4 in an axial direction, a motor 3 including a stator 3 a and a mover 3 b, A movable element 11 composed of a stator 3b, a piston 5, etc .;
b), an elastic element 14 partially fixed to the movable element 11 and partially fixed to the fixed element 12, a weight 18 and a spring 19 elastically deformable in the axial direction of the piston. And a plurality of dynamic vibration absorbers 20 attached to the closed casing 1,
It is possible to obtain a vibration reduction effect corresponding to the vibration of the mounting position, reduce the vibration of the entire closed casing, and provide a compressor with low vibration.

In this embodiment, the piston 5 reciprocates in the horizontal direction.
It goes without saying that the same vibration reduction effect can be obtained by reciprocating the weight 19 of the dynamic vibration absorber 20 in the vertical direction.

In this embodiment, the dynamic vibration absorber 20 is mounted on the inner wall surface of the closed casing. However, the same effect can be obtained by mounting it on the outer wall surface or the compressor body.

(Embodiment 2) FIG. 2 is a sectional view of a vibrating compressor according to Embodiment 2 of the present invention. FIG. 3 is a characteristic diagram according to the present embodiment.

In FIG. 2, reference numeral 22 denotes a dynamic vibration absorber including a weight 23, a spring 24 and a stay 17, and the weight of the weight 23a of the dynamic vibration absorber 22a is smaller than the weight of the weight 23c of the dynamic vibration absorber 22c. In addition, the dynamic vibration absorbers 22a, 2
According to the weight of each weight, the springs 24c are set so that the resonance frequency of 2c substantially matches the operating frequency of the compressor.
The spring constants of a, 24b, 24c, 24d are selected.

The operation of the vibrating compressor configured as described above will be described below.

The vibration when the weight of the weight of the dynamic vibration absorber is changed is not so different when the resonance frequency of the dynamic vibration absorber is optimal, but when the operating frequency and the resonance frequency of the dynamic vibration absorber deviate from each other, The lighter the weight, the more the vibration increases significantly.

The vibrating compressor performs compression efficiently by matching the operating frequency with the resonance frequency of the compression mechanism determined by the mass of the movable element, the spring constant of the elastic element, the pressure of the refrigerant gas in the compression chamber, and the like. . However, since the pressure of the refrigerant gas changes depending on operating conditions, the resonance frequency of the compression mechanism slightly increases under high pressure conditions.

In order to operate with high efficiency, it is necessary to change the operating frequency in accordance with the change in the resonance frequency of the compression mechanism. In this case, the resonance frequency of the dynamic vibration absorber is constant, so that the operating frequency is reduced. As a result, the vibration reduction effect is reduced.

However, according to the present embodiment, since a dynamic vibration absorber 22c using a heavy weight such as 23c is attached to a portion where vibration is large, a high vibration reduction effect can be obtained in a wide operating frequency range. Can be. On the other hand, for places where vibration originally is small, by using the dynamic vibration absorber 22a using the weight 23a having a small weight,
The dynamic vibration absorber can be made small and light while obtaining a sufficient vibration reduction effect.

As described above, the vibratory compressor of this embodiment is
Since the weight of the weight 23a of the at least one dynamic vibration absorber 22a is different from the weight of the weight 23c of the other dynamic vibration absorber 22c, at a position where vibration is large, a high vibration reduction effect is obtained in a wider frequency range, thereby reducing operating conditions. Even if it changes,
Vibration can be reliably reduced.

(Embodiment 3) FIG. 4 is an enlarged view of a main part of a dynamic vibration absorber according to a third embodiment of the present invention.

In FIG. 4, reference numeral 25 denotes a dynamic vibration absorber,
Reference numeral 6 denotes a weight, 27 denotes a spring whose spring constant substantially coincides with the axial spring constant, and one end is attached to the weight 26 and the other end is attached to the stay 17.

The operation of the vibrating compressor constructed as described above will be described below.

In a vibrating compressor, vibrations other than the piston axial direction may occur depending on the method of suspending the compressor body. In particular, when the compressor adopts a horizontal configuration as in the present embodiment, a vertical vibration increases as the distance from the center of gravity of the main body to the piston axial direction increases.

However, according to the dynamic vibration absorber of the present embodiment, the spring constant in the axial direction of the spring, that is, the piston axial direction, and the spring constant in the direction perpendicular thereto are substantially the same, and the weight of the dynamic vibration absorber is equal to the piston axial direction. The resonance frequency in the case of displacing in the right angle direction matches the resonance frequency in the piston axis direction.

Therefore, since the vibration damper has a vibration reducing effect in all directions, it is possible to reduce vibration not only in the axial direction of the piston but also in the direction perpendicular thereto.

As described above, the vibratory compressor of this embodiment is
By making the spring constant of the spring 26 of the dynamic vibration absorber 25 in the reciprocating direction of the piston substantially equal to the spring constant in the direction perpendicular thereto,
It has the effect of reducing vibration in all directions.

(Embodiment 4) FIG. 5 is an enlarged view of a main part of a dynamic vibration absorber according to a fourth embodiment of the present invention.

In FIG. 5, reference numeral 28 denotes a weight 29, four springs 30a, 30b, 30c, 30d and a stay 17;
a and 17b.

The operation of the vibrating compressor having the above configuration will be described below.

When the dynamic vibration absorber is composed of a weight and one or two coil springs, rotational vibration and the like in directions other than the piston reciprocating direction may occur, and the vibration in the piston reciprocating direction may be reduced. Since the weight 29 is sandwiched by four springs, the weight does not vibrate in the rotational direction and vibrates largely in the reciprocating direction of the piston, so that the vibration reducing effect can be reliably obtained.
Moreover, since vibrations other than in the direction of the piston can be prevented, even when the dynamic vibration absorber is arranged close to the closed casing or the oil, the weight does not come into contact with them and the vibration reduction effect of the dynamic vibration absorber does not decrease. Therefore, the vibration reduction effect can be ensured.

As described above, the vibratory compressor of this embodiment is
The dynamic vibration absorber 28 includes one weight 29 and three or more springs 3.
0, which has the effect of preventing the dynamic vibration absorber from vibrating in directions other than the piston reciprocating direction, reliably operating the dynamic vibration absorber, and reducing the vibration.

[0060]

As described above, according to the first aspect of the present invention, there is provided a closed casing, a cylinder housed in the closed casing, a piston reciprocally inserted into the cylinder in the axial direction, a stator and A motor composed of a mover, a movable element composed of a mover and a piston, a fixed element composed of a cylinder, a stator, etc., and a part fixed to the movable element and a part fixed to the fixed element Composed of a fixed elastic element, a weight and a spring that can be elastically deformed in the axial direction of the piston, and composed of a plurality of dynamic vibration absorbers attached to the closed casing. Thus, vibration of the whole closed casing can be reduced, and a compressor with low vibration can be provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the weight of at least one dynamic vibration absorber is different from the weight of the other dynamic vibration absorbers, so that the position where the vibration is large is large. By obtaining a high vibration reduction effect in a wider frequency range, the vibration can be reliably reduced even when the operating conditions change.

According to a third aspect of the present invention, the spring constant of the spring of the dynamic vibration absorber in the first aspect of the invention is substantially equal to the spring constant in the direction of reciprocation of the piston. It has the effect of reducing the vibration in the direction.

According to the fourth aspect of the present invention, the weight of the dynamic vibration absorber in the first aspect of the present invention is changed depending on the mounting position. Thus, even if the operating conditions change, the vibration can be reliably reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibrating compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a vibrating compressor according to a second embodiment of the present invention.

FIG. 3 is a characteristic diagram according to the embodiment.

FIG. 4 is an enlarged view of a main part of a vibrating compressor according to a third embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of a vibrating compressor according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a conventional vibrating compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 4 Cylinder 5 Piston 3a Stator 3b Mover 3 Motor 11 Movable element 12 Fixed element 14 Elastic element 18 Weight 19 Spring 20 Dynamic vibration absorber 22 Dynamic vibration absorber 23 Weight 25 Dynamic vibration absorber 27 Spring 28 Dynamic vibration absorber 29 Weight 30 spring

Claims (4)

[Claims] A motor comprising: a closed casing; a cylinder housed in the closed casing; a piston inserted into the cylinder so as to be able to reciprocate in an axial direction; a stator and a mover; A movable element constituted by a child and the piston, a fixed element constituted by the cylinder and the stator, and an elastic element partially fixed to the movable element and partially fixed to the fixed element. A vibrating compressor comprising: a weight; a spring elastically deformable in the axial direction of the piston; and a plurality of dynamic vibration absorbers attached to the closed casing. 2. The vibration type compressor according to claim 1, wherein the weight of at least one dynamic vibration absorber is different from the weight of another dynamic vibration absorber. 3. The vibrating compressor according to claim 1, wherein a spring constant of a spring of the dynamic vibration absorber in a reciprocating direction of the piston and a spring constant in a direction perpendicular to the reciprocating direction are substantially equal to each other. 4. The vibratory compressor according to claim 1, wherein the dynamic vibration absorber comprises one weight and three or more springs.