JPH10318163A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise generated cause by vibration of a sealed container, by providing the periphery of the sealed container between a securing part of a motor stator and that of a frame with a ring-shaped reinforcement along the periphery. SOLUTION: A ring-shaped reinforcement 8 is mounted on the loop part of a vibration with the largest amplitude between the shrinkage bottom part 7a of a frame 1 and the shrinkage top part 7b of a motor stator 2 in a steel shell 7 constituting a sealed container. The reinforcement 8 has a material chemically inert against refrigerant such as steel, and if it must be light, it has U-shaped hollow structure. The entire outer peripheral surface of the reinforcement 8 is adhered with the inner peripheral surface of the shell 7 by press- fitting or shrinkage fitting. Because the reinforcement 8 raises rigidity and changes the natural frequency, vibration of the shell 7 can be restrain, noise caused by the vibration generated by exciting force caused by higher harmonics in a groove in the motor between shells 7a, 7b is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor provided with a mechanism for reducing noise generated when a shell constituting a closed container of the scroll compressor vibrates.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a diagram showing an internal structure of a conventional scroll compressor disclosed in Japanese Patent Application Publication No. H10-115,878.

In FIG. 1, reference numeral 1 denotes a frame containing spiral bodies 5 and 6, 2 denotes an electric motor stator, and 3 denotes an electric motor rotor, which applies a rotational force via a drive shaft 4. Motor rotor 3
Are formed with the number of slots SL and are operated at the rotation speed N. Reference numeral 7 denotes a cylindrical shell constituting a closed container,
As shown in the figure, a frame 1 and an electric motor stator 2 are tightly fixed inside by shrink fitting. Shell 7
A cavity is formed between the shrink fit lower end 7a of the frame 1 and the shrink fit upper end 7b of the motor stator 2, and has several natural frequencies.

The internal structure of the conventional scroll compressor is constructed as described above, and the main shaft 4 shrunk on the motor rotor 3 rotates by the driving force of the motors 2 and 3, and the rotation is restricted by the rotation preventing mechanism. The orbiting scroll 6 revolves, forms a compression chamber together with the fixed scroll 5 meshing with the orbiting scroll 6, and compresses the refrigerant.

[0005]

The number of slots SL, the number of poles P, the slip ratio s, and the power supply frequency f of the motor rotor 3 are provided between the shells 7a and 7b of the conventional scroll compressor as described above.
Fk = SL * (1-s) generated by the electric motor
It vibrates due to the exciting force of the groove harmonic of an integral multiple of * f / P. When the frequency of this vibration is close to the natural frequency between the shells 7a and 7b, resonance occurs and the noise increases.

[0006] The present invention has been made to solve the above problems, and has as its object to provide a compressor capable of reducing noise generated from vibration of a closed container.

[0007]

In a scroll compressor according to a first aspect of the present invention, a compression mechanism, an electric motor, a main shaft for applying a rotational force to the compression mechanism by the electric motor, and In a scroll compressor in which a supporting frame is housed in an airtight container, and the frame and the motor stator are respectively fixed to the inner peripheral surface of the airtight container, a portion between a fixing portion of the motor stator and a fixing portion of the frame is provided. A ring-shaped reinforcing material is provided on the peripheral surface of the closed container along the peripheral surface.

In the scroll compressor according to the second aspect of the invention, a ring-shaped reinforcing member is attached to the outer peripheral surface of the closed vessel.

In a scroll compressor according to a third aspect of the present invention, a compression mechanism, an electric motor, a main shaft for applying a rotational force to the compression mechanism by the electric motor, and a frame supporting the main shaft are housed in a closed container. In a scroll compressor in which the frame and the motor stator are fixed to the inner peripheral surface of the closed container, a small-diameter portion is provided on the frame side of the motor stator fixing portion of the motor stator, and the motor stator fixing portion and the motor stator are fixed to each other. The length between the fixing portion of the frame and the fixing portion is changed.

In a scroll compressor according to a fourth aspect of the present invention, a compression mechanism, an electric motor, a main shaft for applying a rotational force to the compression mechanism by the electric motor, and a frame supporting the main shaft are housed in a sealed container. In a scroll compressor in which the frame and the motor stator are respectively fixed to the inner peripheral surface of the hermetic container, a relief portion is provided on the frame side of the motor stator fixing portion on the inner peripheral surface of the hermetic container, and the motor stator is fixed. The length between the portion and the fixing portion of the frame is changed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 and 2 show an example of an embodiment of the present invention. FIG. 1 is a sectional view of a scroll compressor, and FIG. 2 is an enlarged view of a main part. FIG. 9 showing a conventional technique.
Portions in common with are denoted by the same numbers.

In FIG. 1, reference numeral 1 denotes a frame in which spiral bodies 5 and 6 are housed, 2 a motor stator, and 3 a motor rotor, which apply a rotational force to a driving mechanism of the spiral body 6 via a drive shaft 4. Reference numeral 7 is a shell made of steel constituting a closed container, and has a stepped portion 7c. 8 is a ring-shaped reinforcing material,
It has a chamfer 8c.

The reinforcing member 8 is provided between the frame 1 shrink fitting lower end 7a of the shell 7 and the motor stator 2 shrink fitting upper end 7b.
It is effective to grasp the vibration mode between them and attach it to the antinode of the vibration having the largest amplitude. The interference between the reinforcing material 8 and the shell 7 also affects the vibration mode between the shells 7a and 7b. The larger the interference, the more effective the vibration is suppressed.

Generally, the vibration mode between the shells 7a and 7b is complicated, and it is difficult to accurately grasp the vibration mode. Normally, a method of measuring using a vibrator or approximately obtaining the value by a finite element method or the like is used, and the shell 7 is designed so that the amplitude at the same frequency as the motor groove harmonic frequency is reduced.

The reinforcing material 8 is desirably a material that is chemically inert to the refrigerant, such as steel, and may have a U-shaped or hollow structure if weight reduction is required. Shape is shell 7
Is more effective when the fixing range is larger.

The step 7c provided on the shell 7 is provided with a reinforcing material 8
Is provided at a position where the vibration of the shell 7 can be surely suppressed when the shell 7 is inserted.
Can be inserted as designed. Further, by providing the chamfer 8c on the reinforcing member 8, the insertability of the reinforcing material is improved. The entire outer peripheral surface of the reinforcing material 8 is tightly fitted to the inner peripheral surface of the shell 7 by press fitting or shrink fitting.

The rigidity is increased by the reinforcing member 8 between the frame 1 shrink fit lower end portion 7a and the motor stator 2 shrink fit upper end portion 7b of the shell 7 configured as described above, and the natural frequency is also changed. Vibration can be suppressed, and noise caused by vibration between the shells 7a and 7b generated by an exciting force due to groove harmonics of the electric motor can be reduced.

Further, instead of the above structure in which the reinforcing member 8 is provided inside the shell 7, a reinforcing member 9 may be attached to the outside of the shell 7 as shown in FIG. In this case, after assembling the scroll compressor, if necessary, the vibration mode of the motor motor groove harmonic frequency between the shells 7a and 7b is measured,
The reinforcing member 9 is attached to the antinode of the vibration.

FIG. 4 shows a specific shape of the reinforcing member 9. It is desirable that the reinforcing member 9 be in close contact with the shell 7. In this method, the inner diameter of the reinforcing member 9 is made slightly smaller than the outer shape of the shell 7, and a drill hole 9c is provided in the reinforcing member 9a, and a screw hole 9d is provided in the reinforcing member 9b. Tighten the shell 7
Can be tightly fixed.

This close contact prevents the vibration of the shell 7 from being suppressed because the reinforcing member 9 contacts the shell 7 at only a few points when the shell is not a perfect circle. .

Embodiment 2 FIG. FIG. 5 is a diagram showing another example of the embodiment of the present invention, and is an enlarged view of a main part. In the figure, reference numeral 2 denotes an electric motor stator, which has a small-diameter portion 2a at the upper end of the stator, which is slightly smaller than the lower end of the stator. Although the motor stator 2 is shrunk in the shell 7, the small diameter portion 2 a at the upper end of the motor stator does not contact the shell 7. Thus, the length between the shells 7a and 7b is changed.

It is difficult to theoretically determine the natural frequency of the shell 7 configured as described above. Normal shell 7
Is applied, and its response is measured, or the approximate frequency is calculated by a finite element method or the like to obtain a natural frequency.
The natural frequency of the shell 7 obviously depends on the length between the shells 7a and 7b. By providing a small-diameter portion 2a at the upper end of the motor stator that does not contact the inner wall of the shell, the length between the shells 7a and 7b is reduced. The natural frequency of the changing shell can be changed.

FIG. 7 shows the result of measurement of the natural frequency between the shells 7a and 7b when the small-diameter portion 2a is not provided in the motor stator 2. FIG.
Is a result of measuring the natural frequency between the shells 7a and 7b in the case of providing. The natural frequency between the shells 7a and 7b when the small-diameter portion 2a is not provided in the motor stator 2 is 3200.
Hz, the natural frequency between the shells 7a and 7b when the motor stator 2 is provided with the small diameter portion 2a is 308.
It is clear that the natural frequency between the shells 7a and 7b depends on the length between the shells 7a and 7b.

On the other hand, the number of slots SL = 34, the slip ratio s = 0.04, the power supply frequency f = 50 Hz, the number of poles P =
The second harmonic component of the groove harmonic of the second motor is at 3264 Hz.
This frequency substantially coincides with the natural frequency between the shells 7a and 7b when the small-diameter portion 2a is not provided in the electric motor stator 2, causing resonance of the shell and causing noise. By providing the motor stator 2 with the small-diameter portion 2a, the natural frequency between the shells 7a and 7b can be reduced by 308.
At 7 Hz, the resonance of the shell was prevented, and the noise was reduced.

As described above, as a result of measuring or approximating the natural frequency between the shells 7a and 7b, when the groove harmonic frequency generated by the electric motor is close to the natural frequency between the shells 7a and 7b, they are resonated. There is a possibility that a strong noise is generated due to the vibration between the shells 7a and 7b. By providing the motor stator 2 with the small diameter portion 2a, the shells 7a, 7b
The natural frequency between the motor stator 2 can be changed.
And the shells 7a and 7b can be prevented from resonance. At this time, the length of the small-diameter portion 2a provided on the motor stator 2 is determined by the shells 7a and 7 when the small-diameter portion 2a is provided on the motor stator 2.
It is necessary to determine the natural frequency between b by measuring or performing approximate calculation.

Embodiment 3 FIG. FIG. 6 is a diagram showing a third embodiment of the present invention, and is an enlarged view of a main part. In this embodiment, the shell 7 is provided with a portion 7c for releasing shrinkage with the electric motor stator 2. The relief portion 7c of the shell 7 and the motor stator 2 are not in contact.

As described above, the natural frequency between the shells 7a and 7b depends on the length between the shells 7a and 7b.
Therefore, by providing the escape portion 7c in the shell 7,
The natural frequency between the shells 7a and 7b can be changed.

If the natural frequency between the shells 7a and 7b is measured or calculated as an approximate value, if the natural frequency is close to the groove harmonic frequency generated by the motor, they may resonate and generate strong noise due to the vibration between the shells 7a and 7b. There is. By providing the escape portion 7c in the shell 7, the natural frequency between the shells 7a and 7b can be changed, and resonance between the motor stator and the shell can be prevented. At this time, the length of the relief portion 7c provided on the shell 7 must be determined by measuring or calculating an approximate value of the natural frequency between the shells 7a and 7b when the relief portion 7c is provided on the shell 7.

[0029]

As described above, according to the compressor according to the first aspect of the present invention, the compression mechanism, the electric motor, the main shaft that applies the rotational force to the compression mechanism by the electric motor, and the frame that supports the main shaft are provided. In a scroll compressor which is housed in an airtight container, and the frame and the motor stator are respectively fixed to the inner peripheral surface of the airtight container, in a sealed container inner peripheral surface between the fixing portion of the electric motor stator and the fixing portion of the frame. Since the ring-shaped reinforcing material is inserted along the inner peripheral surface, the amplitude of the sealed container can be reduced, the resonance with electric harmonics can be prevented, the vibration of the shell is reduced, and abnormal noise is reduced. It is possible to provide a scroll compressor that does not generate any scroll compressor.

According to the scroll compressor according to the second aspect of the present invention, since the ring-shaped reinforcing member is attached to the outside of the peripheral surface of the closed vessel, the shell vibration mode and the natural frequency are measured as required after the compressor is assembled. In addition, a reinforcing material can be attached to an optimum position.

According to the scroll compressor according to the third aspect of the invention, the compression mechanism, the electric motor, the main shaft for applying a rotating force to the compression mechanism by the electric motor, and the frame supporting the main shaft are housed in a closed container. In a scroll compressor in which the frame and the motor stator are respectively fixed to the inner peripheral surface of a closed container, on the frame side of the motor stator fixing portion,
A small diameter portion formed by cutting out the motor stator was provided, and the length between the fixed portion of the motor stator and the fixed portion of the frame was changed. Therefore, the fixed portion of the frame and the fixed portion of the stator were not significantly changed without significantly changing the rigidity of the shell. The length between the parts can be changed, and the natural frequency of the shell between them can be changed.

According to the scroll compressor of the fourth aspect, the compression mechanism, the electric motor, the main shaft for applying a rotational force to the compression mechanism by the electric motor, and the frame supporting the main shaft are housed in a closed container. In a scroll compressor in which the frame and the motor stator are respectively fixed to the inner peripheral surface of a closed container, on the frame side of the motor stator fixing portion,
A relief portion formed by shaving the inner peripheral surface of the sealed container is provided, and the length between the fixed portion of the motor stator and the fixed portion of the frame is changed. Therefore, the distance between the frame and the fixed portion of the stator can be reduced without reducing the efficiency of the motor. Can be changed, and the natural frequency of the shell during this period can be changed.

[Brief description of the drawings]

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

FIG. 2 is an essential part perspective view showing Embodiment 1 of the present invention;

FIG. 3 is an external view showing a scroll compressor according to Embodiment 1 of the present invention.

FIG. 4 is a perspective view showing a reinforcing member according to the first embodiment of the present invention.

FIG. 5 is a perspective view of a main part of a scroll showing Embodiment 2 of the present invention.

FIG. 6 is a perspective view of a main part of a scroll showing Embodiment 3 of the present invention.

FIG. 7 is a curve diagram showing measurement results of a shell natural frequency in a conventional compressor.

FIG. 8 is a curve diagram showing measurement results of a shell natural frequency according to the second embodiment of the present invention.

FIG. 9 is a sectional view showing a conventional compressor.

[Explanation of symbols]

1 frame, 2 motor stators, 3 motor rotors, 4 main shafts, 5 fixed scrolls, 6 swinging scrolls, 7 shells, 8 reinforcements, 9 reinforcements.

Claims (4)

[Claims] 1. A compression mechanism, an electric motor, a main shaft for applying a rotating force to the compression mechanism by the electric motor, and a frame supporting the main shaft are housed in a closed container, and the frame and the motor stator are respectively housed. In the scroll compressor fixed to the inner peripheral surface of the closed container, a ring-shaped reinforcing material along the peripheral surface is provided on the closed container peripheral surface between the fixed portion of the electric motor stator and the fixed portion of the frame. A scroll compressor characterized by being provided. 2. The scroll compressor according to claim 1, wherein a ring-shaped reinforcing member is attached to an outer peripheral surface of the closed vessel. 3. A compression mechanism, an electric motor, a main shaft for applying a rotational force to the compression mechanism by the electric motor, and a frame supporting the main shaft are housed in a closed container, and the frame and the motor stator are respectively housed. In the scroll compressor fixed to the inner peripheral surface of the closed container, a small-diameter portion is provided on a frame side of the motor stator fixed portion of the motor stator, and a length between the fixed portion of the motor stator and the frame fixed portion is increased. A scroll compressor characterized by changing its length. 4. A compression mechanism, an electric motor, a main shaft for applying a rotating force to the compression mechanism by the electric motor, and a frame supporting the main shaft are housed in a closed container, and the frame and the electric motor stator are respectively housed in the closed container. In the scroll compressor fixed to the inner peripheral surface of the closed container, a relief portion is provided on the frame side of the motor stator fixed portion on the inner peripheral surface of the closed container, and the escape portion is provided between the fixed portion of the motor stator and the fixed portion of the frame. A scroll compressor characterized by changing the length of the scroll.