JP2003003957A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a pulsation component generated inside a closed container to reduce noise, by arranging a ring-shaped reinforcing member inside the closed container and forming in the reinforcing member a plurality of resonance parts having given resonance frequency. SOLUTION: In this hermetic compressor, an electric motor 3 and a compression part 2 are arranged inside the closed container 1, a shaft which transmits a rotation force of the electric motor 3 to the compression part 2, and a main frame 8 which supports a main shaft 7b formed to one end of the shaft 7 are provided, and the main frame 8 and a stator 3b of the electric motor 3 are fixed to an inner peripheral surface of the closed container. In the closed type compressor, the inner peripheral surface between a fixing part of the stator and a fixing part of the main frame 8, of the closed container 1 is provided with the ring-shaped reinforcing members 11 along the inner peripheral surface, and the groove-shaped resonance parts 12 each having at least one resonance frequency are provided to an outer peripheral part of each of the reinforcing members 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in an air conditioner and the like, and more particularly, to a reinforcing material provided in an airtight container and capable of reducing noise, and the same. The present invention relates to the structure of the formed resonance part having a predetermined resonance frequency.

[0002]

2. Description of the Related Art For example, a conventional hermetic compressor is shown in FIG.
There is one as disclosed in Japanese Unexamined Patent Publication No. 10-318163 shown in (A) and (B). In the figure, 21 is a spiral body 2
A frame accommodating 5, 26, 22 is an electric motor stator, and 23 is an electric motor rotor, which applies a rotational force to a drive mechanism of the spiral body 26 via a drive shaft 24. Reference numeral 27 denotes a steel shell that constitutes a closed container and is provided with a step portion 27c. Reference numeral 28 is a ring-shaped reinforcing member, which has a chamfer 28c.

The reinforcing member 28 is formed from the bottom end 27a of the frame 21 of the shell 27 to the bottom end 27a of the motor stator 22 and the top end of the shrink fit.
It is effective to grasp the vibration mode between 27b and attach it to the antinode of the vibration with the largest amplitude. Also, the reinforcing material 28
The interference between the shell 27 and the shell 27 also affects the vibration mode between the shells 27a and 27b, and the larger the interference is, the more effective the vibration is.

Generally, the vibration mode between the shells 27a and 27b is complicated, and it is difficult to grasp this accurately.
Usually, a method using a vibration exciter or an approximate method such as the finite element method is used to reduce the amplitude at the same frequency as the electric mechanism harmonic frequency.
To design. The step portion 27c provided on the shell 27 is provided at a position where the vibration of the shell 27 can be surely suppressed when the reinforcing material 28 is inserted, and the step portion 27c allows the reinforcing material 28 to be positioned as designed. Can be inserted into.

The rigidity is increased by the reinforcing material 28 between the frame 1 shrinkage lower end 27a of the shell 27 and the motor stator 22 shrinkage upper end 27b of the shell 27, and the natural frequency also changes. Shell 27 that can suppress vibration and is generated by the excitation force due to the harmonics of the electric mechanism
Noise caused by the vibration between a and 27b can be reduced. However, inside the shell 27, pulsation due to compression and expansion of the refrigerant occurs, and this pulsation contains a plurality of frequency components.
Therefore, there is a problem that the noise reducing effect is small only with the reinforcing material 28.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a ring-shaped reinforcing member is provided in a closed container, and a plurality of resonance parts having a predetermined resonance frequency are formed in the reinforcing member. Thus, it is an object of the present invention to provide a hermetic compressor that can reduce pulsating components generated inside the hermetic container and reduce noise.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a shaft for arranging an electric motor and a compressor in a closed container and transmitting the rotational force of the electric motor to the compressor. And a main frame supporting a main shaft formed at one end of the shaft, and a stator of the electric motor and the main frame fixed to the inner peripheral surface of the hermetically sealed container. On the inner peripheral surface of the closed container between the fixing portion and the fixing portion of the main frame, a ring-shaped reinforcing material is provided along the inner peripheral surface, and at least one resonance frequency is provided on the outer peripheral portion of the reinforcing material. It has a configuration in which a groove-shaped resonance portion having is provided.

Further, the resonance part is constituted by a communication groove communicating from the upper end to the lower end of the reinforcing member and having a first predetermined resonance frequency.

Further, the resonance portion is formed of a concave groove having an opening at either the upper end or the lower end of the reinforcing member and having a second predetermined resonance frequency.

Further, the resonance portion has a concave portion at a substantially central portion of the reinforcing material, and a groove for communicating the concave portion with an opening at either the upper end or the lower end of the reinforcing material. The configuration is a Holmhertz resonator having a frequency.

Further, the resonance part has a configuration in which all or any combination of the first, second and third predetermined resonance frequencies is provided.

Further, the reinforcing member has a structure in which the entire outer peripheral surface is brought into close contact with the inner peripheral surface of the closed container by press fitting or shrink fitting.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail as examples based on the drawings. FIG. 1 is a vertical sectional view of a hermetic compressor according to the present invention, and FIG. 2 is an enlarged sectional view of an essential part of the present invention. Here, a scroll type compressor will be described. In the figure, an electric motor 3 having a stator 3b fixed to the inner peripheral surface of the closed container 1 and a rotor 3a driven and rotated by the stator 3b in the closed container 1, and driven by a driving force of the electric motor 3 Compressor 2
And are arranged.

The compression section 2 includes a fixed scroll 4 in which a spiral wrap 4b is erected on the inner surface of an end plate 4a, and a plurality of compression chambers 5 in which the fixed scroll 4 and the end plate 6a inner wrap 6b are meshed with each other. The orbiting scroll 6 forming the orbiting scroll 6 and the orbiting bearing formed in the boss portion 6c on the back surface of the orbiting scroll 6 are inserted with the orbiting shaft 7a at the tip, and the rotational force of the electric motor unit 3 is transmitted to the orbiting scroll 6. It comprises a shaft 7 and a main frame 8 which supports a main shaft 7b provided below the revolving shaft 7a of the shaft 7 and which is fixed to the inner peripheral surface of the closed container 1. Further, the airtight container 1 is divided into a discharge chamber a for discharging a compressed refrigerant gas from the compression chamber 5 and an electric motor chamber 3a for accommodating the electric motor 3 by the compression unit 2, and The suction pipe 9 is provided in the suction chamber 2a,
Discharge pipes 10 are connected to the discharge chambers 10a, respectively.

On the inner peripheral surface of the closed container 1 between the fixed portion a of the stator 3b and the fixed portion b of the main frame 8,
A ring-shaped reinforcing member 11 is provided along the inner peripheral surface, and a groove-shaped resonance portion 12 having at least one resonance frequency is provided on the outer peripheral portion of the reinforcing member 11.
Further, the reinforcing member 11 is configured such that the entire outer peripheral surface thereof is brought into close contact with the inner peripheral surface of the closed container 1 by press fitting or shrink fitting.

As shown in FIG. 2, the resonance portion 12 is composed of a communication groove communicating from the upper end to the lower end of the reinforcing member 11 and having a first predetermined resonance frequency f1. The first predetermined resonance frequency f1 is obtained by the following equation, where c is the sonic velocity of the refrigerant and L1 is the length of the communication groove. f1 = c / 2 × L1 Therefore, for the pulsating sound generated in the closed container 1 or the noise of the electric motor 3 or the like, if the length L1 of the communication groove is changed and the resonance frequency f1 is adjusted, the noise in that frequency band is absorbed. can do.

FIG. 3 shows another embodiment of the present invention, in which (A) shows a resonance portion 12a formed by a groove having an opening at the upper end of the reinforcing member 11 and having a second predetermined resonance frequency f2. In FIG. 6B, the lower end of the reinforcing member 11 is opened, and the resonance portion 12b formed of a concave groove having the second predetermined resonance frequency f2 is provided. The second predetermined resonance frequency f2 is calculated by the following formula, where c is the sound velocity of the refrigerant and L2 is the length of the concave groove. f2 = c / 4 × L2 Therefore, in the same manner as the above-mentioned embodiment, if the pulsating sound generated in the closed container 1 or the noise of the electric motor 3 or the like is changed, the length L2 of the groove is changed to adjust the resonance frequency f2. The noise in that frequency band can be absorbed.

FIG. 4 shows still another embodiment of the present invention, in which (A) is a recess 12c1 in the substantially central portion of the reinforcing member 11,
The groove 12c2 that connects the recess 12c1 and the opening at the lower end of the reinforcing member 11 is provided, and the configuration is made up of a Holmhertz resonator 12c having a third predetermined resonance frequency f3. ) Is provided at the upper end of the reinforcing member 11. In the third predetermined resonance frequency f3, the sound velocity of the refrigerant is c, the vertical length of the groove 12c2 is L3, the area of the opening is S,
When the volume of the recess 12c1 is V, it is calculated by the following formula. f3 = (c / 2π) * √ (S / V × L3) Therefore, for example, in order to tune the resonance frequency f3 to a low frequency band, the volume of the recess 12c1 is increased by V or the length of the groove 12c2 is calculated from the above formula. You can increase L3. As a result, a plurality of various resonators are provided for the pulsating sound generated in the closed container 1 or the noise of the electric motor 3, etc., and the resonance frequency of the Holmhertz resonator 12c is set in each frequency band.
By adjusting f3, noise in that frequency band can be absorbed.

In the above structure, the frequency band of the pulsating sound generated in the closed container 1 or the noise of the electric motor 3 or the like is measured, and the ring-shaped reinforcing member is formed on the inner peripheral surface of the closed container 1 along the inner peripheral surface. 11 is provided, and a plurality of resonance parts having different resonance frequencies that are tuned to the noise frequency band are provided on the outer peripheral portion of the reinforcement member 11, so that the pulsation component generated inside the closed container 1 is reduced, and the pulsation sound is reduced. Alternatively, the hermetic compressor can reduce noise of the electric motor 3 and the like.

[0020]

As described above, according to the present invention, a ring-shaped reinforcing member is provided on the inner peripheral surface of the closed container along the inner peripheral surface, and the outer peripheral portion of the reinforcing member has a noise frequency band. By providing a plurality of tuned resonance parts having different resonance frequencies, the pulsating component generated inside the closed container can be reduced, and the pulsating sound or the noise of the electric motor or the like can be reduced, and the closed type compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of an essential part showing an embodiment of the present invention.

FIG. 3 is an enlarged perspective view of an essential part showing another embodiment of the present invention,
(A) has an opening at the upper end, and (B) has an opening at the lower end.

FIG. 4 is an enlarged perspective view of an essential part showing still another embodiment of the present invention, in which (A) has an opening at the lower end and (B) has an opening at the upper end.

5A is a vertical sectional view of a hermetic compressor according to a conventional example, and FIG. 5B is an enlarged perspective view of a main part.

[Explanation of symbols]

1 closed container 2 Compressor 3 electric motor 3a rotor 3b stator 3c electric motor room 4 fixed scroll 4a End plate 5 compression chamber 6 orbiting scroll 6a End plate 7 shaft 8 main frames 9 Inhalation tube 10 Discharge pipe 10a discharge chamber 11 Reinforcement material 12 Resonance part

Claims (6)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container, a shaft for transmitting the rotational force of the electric motor to the compression unit, a main frame for supporting a main shaft formed at one end of the shaft, A hermetic compressor in which a main frame and a stator of the electric motor are respectively fixed to the inner peripheral surface of the hermetic container, wherein the inner peripheral surface of the hermetic container between the fixing portion of the stator and the fixing portion of the main frame. The ring-shaped reinforcing material is provided along this inner peripheral surface, and at the outer peripheral portion of the reinforcing material,
A hermetic compressor characterized by comprising a groove-shaped resonance part having at least one resonance frequency. 2. The hermetic compressor according to claim 1, wherein the resonance portion is a communication groove that communicates from the upper end to the lower end of the reinforcing member and has a first predetermined resonance frequency. 3. The hermetic compressor according to claim 1, wherein the resonance part is formed of a groove having an opening at either the upper end or the lower end of the reinforcing member and having a second predetermined resonance frequency. . 4. The third predetermined resonance is provided, wherein the resonance portion includes a concave portion at a substantially central portion of the reinforcing material, and a groove that communicates the concave portion with an opening at either the upper end or the lower end of the reinforcing material. The hermetic compressor according to claim 1, wherein the hermetic compressor comprises a Holmhertz resonator having a frequency. 5. The hermetically sealed type according to claim 1, wherein the resonance part is made of all or any combination of the first, second and third predetermined resonance frequencies. Compressor. 6. The hermetic compressor according to claim 1, wherein the reinforcing material is press-fitted or shrink-fitted so that the entire outer peripheral surface is in close contact with the inner peripheral surface of the hermetic container.