JP2001059477A - Hermetic motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the resonance noises of an oil supply pipe and the resonance noises of a crankshaft, generated in rotation of the oil supply pipe in a refrigerating machine oil. SOLUTION: A compressing element 2 and a motor driving element 3 are arranged in the state of being elastically supported in a hermetic container, and the compressing element 2 has a crank shaft 5 consisting of an eccentric portion 6 and a main shaft rotationally driven by the motor driving element 3, a balancing weight 12 provided in the eccentric portion 6 and a concentric oil supply pipe 13 rotated concentrically with the main shaft provided in the balancing weight 12, whereby the stirring operation of a refrigerating machine oil is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor used for a refrigerator or the like.

[0002]

2. Description of the Related Art As a conventional hermetic electric compressor, one described in Japanese Patent Application Laid-Open No. 8-144950 is known.

Hereinafter, an example of a conventional hermetic electric compressor will be described with reference to the drawings.

FIG. 12 is a sectional view showing a conventional hermetic electric compressor, and FIG. 13 is a sectional view of a main part of a crankshaft of the conventional hermetic electric compressor. 12 and 13, reference numeral 1 denotes a closed container, 2 denotes a compression element, 3 denotes an electric element, and 4 denotes refrigeration oil retained at the bottom of the closed container. Reference numeral 14 denotes a refrigerant that fills the space in the closed container.

[0005] Further, reference numeral 5 denotes a crankshaft, and 6 denotes a crankshaft 5.
An eccentric portion 7 is provided for supporting the crankshaft 5. Reference numeral 8 denotes an oil supply pipe fixed to the eccentric portion 6, and its tip is open to the refrigerating machine oil 4. 9 is a connecting rod,
Reference numeral 10 denotes a piston, 11 denotes a piston pin connecting the piston 10 and the connecting rod 9, and the eccentric portion 6 and the connecting rod 9
Is connected.

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

In the compression element 2, the eccentric part 6 and the connecting rod 9 change the rotational force of the electric element 3 into a reciprocating movement force, and the piston 10 compresses.

Further, the crankshaft 5 is driven to rotate by the electric element 3, and the oil supply pipe 8 having the centrifugal pump section 8 a rotates in the refrigerating machine oil 4 enclosed in the closed container 1, so that the oil pressure inside the oil supply pipe 8 is increased. Is generated, and the refrigerating machine oil 4 is sucked up by the oil supply pipe 8 and supplied to each sliding portion.

[0009]

However, in the above configuration, since the centrifugal pump section 8a rotates in the refrigerating machine oil 4, the oil supply pipe 8 cuts the oil surface into a mortar shape and vigorously agitates the refrigerating machine oil 4. .

At this time, the refrigerant 1 dissolved in the refrigerator oil 4
4 is foamed, and the bubbles vibrate the rotating oil supply pipe 8 to generate resonance noise of the oil supply pipe, and sound of the oil supply pipe 8 cutting the oil surface.
The noise of the refrigerating machine oil 4 violently agitated by the oil supply pipe 8 colliding with the oil surface, the inner wall of the sealed container, the compression element, and the like has a problem that the noise of the hermetic electric compressor is increased.

Also, in the compression element 2, the crankshaft 5 is repeatedly bent and deformed when the eccentric portion 6 is vibrated by a large intermittent load received from the connecting rod 9 during compression. There is a problem that the noise of the electric compressor is increased.
If the oil supply pipe 8 is provided concentrically with the crankshaft 5, the refrigerating machine oil can be prevented from being agitated.

In order to solve the above-mentioned problems, the present invention solves the problem of resonance noise of the oil supply pipe, the sound of the oil supply pipe breaking the oil surface, the noise of the refrigerating machine oil agitated by the oil supply pipe, and the resonance of the crankshaft due to the deflection of the crankshaft. It is an object of the present invention to reduce noise and reduce noise of a hermetic electric compressor and to ensure lubrication of a sliding portion of a compression element.

[0013]

In order to solve the above-mentioned problems, in the present invention, the material of the oil supply pipe is set at a low frequency at which the natural frequency has little effect on hearing.

Further, the shape of the oil supply pipe is made of a material having high rigidity, or the agitation of the refrigerating machine oil is suppressed.

[0015] Further, an intervening portion for suppressing the resonance noise of the oil supply pipe is provided at the joint of the oil supply pipe.

A balance weight is provided below the eccentric portion provided on the crankshaft, and the balance weight is provided with a concentric oil supply pipe which rotates concentrically with the main shaft of the crankshaft.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is provided with an oil supply pipe having a centrifugal pump action made of a synthetic resin at an eccentric portion at the lower end of a crankshaft. By shifting to a low frequency that has little effect on hearing, there is an effect that generation of noise from the fuel supply pipe is suppressed.

According to a second aspect of the present invention, there is provided an oil supply pipe joined to a lower end portion of a crankshaft by disposing an intermediate material made of a synthetic resin, and compresses refrigeration oil by a centrifugal pump. It has the effect of supplying to each sliding part of the element, and at the same time the resonance sound of the oil supply pipe shifts to a low frequency that has little effect on hearing, so that the noise from the oil supply pipe can be more effectively suppressed. Having.

According to a third aspect of the present invention, a balance weight portion having an oil supply hole provided in an eccentric portion of a crankshaft is provided with a concentric oil supply pipe which rotates concentrically with a main shaft of the crankshaft. The concentric oil supply pipe has the function of supplying the refrigerating machine oil sucked up by the pump action using the centrifugal force inside the concentric oil supply pipe to each sliding portion of the compression element via the inside of the balance weight and the inside of the crankshaft. In addition, since the rotation of the refrigerating machine oil is sufficiently suppressed from being stirred as compared with the related art, the effect of suppressing the resonance noise of the oil supply pipe due to the refrigerant in the refrigerating machine oil, the oil surface cutoff noise, and the sound generated by the rejected refrigerating machine oil. Having.

According to a fourth aspect of the present invention, a balance weight portion provided at an eccentric portion of a crankshaft and a concentric oil supply pipe which performs concentric rotation with a main shaft of the crankshaft are integrated. By increasing the rigidity of the oil supply pipe, the resonance sound of the oil supply pipe shifts to a low frequency that has little effect on hearing,
It has the effect of suppressing the generation of noise from the oil supply pipe and reducing the noise of the hermetic electric compressor.

According to a fifth aspect of the present invention, a concentric oil supply pipe made of a synthetic resin that rotates concentrically with the main shaft of the crankshaft is provided on a balance weight portion provided on the eccentric portion of the crankshaft, The resonance noise of the oil supply pipe shifts to a low frequency that has little effect on hearing, the generation of noise from the oil supply pipe is suppressed, and the noise of the hermetic electric compressor is reduced.

According to a sixth aspect of the present invention, a balance weight portion provided at an eccentric portion of a crankshaft and a concentric lubrication pipe which rotates concentrically with a main shaft of the crankshaft are provided with an intermediate member made of synthetic resin. Since they are joined, the resonance noise of the oil supply pipe is more effectively suppressed, and the generation of noise from the oil supply pipe is suppressed.

According to a seventh aspect of the present invention, an auxiliary means such as a coil spring is provided on the inner side of the concentric oil supply pipe to enhance the pump action, and the auxiliary means supplies the refrigerating machine oil to the sliding portion. It has the effect of increasing the amount and improving the lubricity.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a sectional view showing a main part of a crankshaft in an embodiment of a hermetic electric compressor according to the present invention.

In FIG. 1, reference numeral 18 denotes an oil supply pipe made of a synthetic resin fixed to the lower end of the crankshaft 5 and having an open end in the refrigerating machine oil, which has a centrifugal pump function as is well known.

In the hermetic electric compressor constructed as described above, the crankshaft 5 rotates by the action of the electric element, and the oil supply pipe 18 fixed to the lower end also rotates with the crankshaft.

At this time, the oil level of the refrigerating machine oil is agitated by the rotation of the refueling pipe 18, the refrigerant dissolved in the refrigerating machine oil foams, and the rotating refueling pipe 18 is vibrated by the bubbles. By making the material of the synthetic resin 18 a synthetic resin, the resonance sound of the oil supply pipe shifts to a low frequency that has little effect on hearing, thereby suppressing the generation of noise from the oil supply pipe 18.

(Embodiment 2) Similarly, in FIG. 1, reference numeral 21 denotes an intermediate member made of a synthetic resin.
Since the resonance sound of the oil supply pipe 18 shifts to a low frequency that has little effect on hearing, the noise from the oil supply pipe 18 is suppressed.

(Embodiment 3) FIG. 2 is a longitudinal sectional view of a hermetic electric compressor showing an embodiment of the present invention.

In FIG. 2, reference numeral 12 denotes a balance weight fixed to the crank eccentric portion 6, and reference numeral 13 denotes a concentric oil supply pipe fixed to the balance weight 12. The concentric oil supply pipe 13 has a substantially conical lower end, and a pump action is generated by rotation.

The crankshaft 5 rotates by the action of the electric element 3, and the concentric oil supply pipe 13 fixed to the balance weight 12 provided in the eccentric part 6 also rotates with the crankshaft.

At this time, the concentric oil supply pipe 13 rotating in the refrigerating machine oil 4 is concentric with the crankshaft, so that the agitating of the refrigerating machine oil due to the rotation is sufficiently suppressed as compared with the conventional case, so that the refrigerant in the refrigerating machine oil is used. The generation of the resonance noise of the oil supply pipe, the oil level cutoff noise, and the noise caused by the refrigerating machine oil that has been splashed off is suppressed.

(Embodiment 4) FIG. 3 is a sectional view of a main part of a crankshaft in a hermetic electric compressor according to an embodiment of the present invention.

In FIG. 3, reference numeral 33 denotes a balance weight 1
2 ′ is a concentric oil supply pipe, which is integrated with the balance weight 12 ′ to increase the rigidity of the oil supply pipe 33, and shifts the resonance sound of the oil supply pipe to a low frequency that has little effect on hearing, thereby refueling. Generation of noise from the pipe is suppressed.

(Embodiment 5) FIG. 4 is a sectional view of a main part of a crankshaft of a hermetic electric compressor according to an embodiment of the present invention.

In FIG. 4, reference numeral 23 denotes a concentric oil supply pipe made of a synthetic resin. When the oil supply pipe is made of a synthetic resin, the resonance sound of the oil supply pipe shifts to a low frequency with little effect on hearing. Generation of noise is suppressed.

(Embodiment 6) FIG. 5 is a sectional view of a main portion of a crankshaft according to another embodiment of the present invention.

In FIG. 5, 31 is the balance weight 12
And concentrically formed of a synthetic resin disposed at the joint of the oil supply pipe 23. By arranging the intermediate at the joint, the resonance noise of the oil supply pipe is suppressed, and the generation of noise from the oil supply pipe is suppressed. .

(Embodiment 7) FIG. 6 is a sectional view of a concentric oil supply pipe showing still another embodiment of the present invention.

In FIG. 6, reference numeral 43 denotes a coil spring 44
Is a concentric oil supply pipe. Coil spring 44
Is an auxiliary means for increasing the pumping action, and various auxiliary means such as a spiral plate and a conical oil supply hole itself are employed as is well known. By providing such an auxiliary means, the supply amount of the refrigerating machine oil can be increased while the stirring action is suppressed.

[0042]

According to the first aspect of the present invention, the material of the oil supply pipe is made of synthetic resin, so that the natural frequency of the oil supply pipe is shifted to a low frequency with little effect on hearing, and the oil supply pipe resonance noise is reduced. By reducing the noise, the noise of the hermetic electric compressor can be reduced.

According to a second aspect of the present invention, a closed type electric motor is provided by disposing an intermediate member made of synthetic resin at a joint between a lower end of a crankshaft and an oil supply pipe to suppress resonance noise of the oil supply pipe. The noise of the compressor can be reduced.

According to a third aspect of the present invention, the oil supply pipe rotates concentrically with the main shaft of the crankshaft to suppress the agitation of the refrigerating machine oil by the oil refilling pipe. Noise, oil level cutoff, and refrigeration oil splashing noise can be reduced, and the balance weight can suppress crankshaft deflection and reduce crankshaft resonance noise. Noise can be reduced.

The invention according to claim 4 of the present invention is the invention according to claim 3.
In addition to the effects of the invention of the present invention, the oil supply pipe and the balance weight are integrated to increase the rigidity of the oil supply pipe, and the natural frequency of the oil supply pipe is shifted to a low frequency that has little effect on hearing, so that the resonance noise of the oil supply pipe is reduced. At the same time, the noise of the hermetic electric compressor can be reduced, and the oil supply pipe mounting operation in the manufacturing process can be omitted.

According to a fifth aspect of the present invention, in addition to the effect of the third aspect, the natural frequency of the oil supply pipe is reduced to a low frequency having little effect on hearing by using a synthetic resin as the oil supply pipe material. By shifting, it is possible to reduce the resonance noise of the oil supply pipe and at the same time reduce the noise of the hermetic compressor.

According to a sixth aspect of the present invention, in addition to the effect of the third aspect of the present invention, by providing an intermediate material made of a synthetic resin at the joint between the balance weight and the oil supply pipe, resonance of the oil supply pipe is achieved. The noise of the hermetic compressor can be reduced while suppressing the noise.

According to the invention of claim 7 of the present invention, by providing auxiliary means for enhancing the pumping action inside the oil supply pipe, the effect of sucking the refrigerating machine oil inside the concentric oil supply pipe is increased, and the refrigerating machine oil to the sliding portion is provided. Can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a crankshaft of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the hermetic electric compressor in one embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a crankshaft according to another embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a crankshaft according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a crankshaft according to still another embodiment of the present invention.

FIG. 6 is a sectional view of a fuel supply pipe showing still another embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional hermetic electric compressor.

FIG. 8 is a sectional view of a main part of a crankshaft in a conventional hermetic electric compressor.

[Explanation of symbols]

Reference Signs List 5 Crankshaft 6 Eccentric portion of crankshaft 12 Balance weight 13 Concentric lubrication pipe 18 Resin lubrication pipe 21 Intermediate material composed of synthetic resin disposed at eccentric part of crankshaft and lubrication pipe 23 Concentric lubrication pipe composed of synthetic resin 31 Balance Intermediate material made of synthetic resin disposed at the joint between the weight and the concentric lubrication pipe 33 Concentric lubrication pipe integrated with the balance weight 43 Concentric lubrication pipe provided with a coil spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Manabu Motegi 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Masahiko Osaka 4-chome, Takaidahondori, Higashiosaka-shi, Osaka No.2-5 Matsushita Refrigeration Co., Ltd. F-term (reference) 3H003 AA02 AB04 AC03 AD03 BA00 BD04 BD06

Claims (7)

[Claims] 1. A compression element and an electric element elastically supported in a closed container are provided, wherein the compression element has a crankshaft having an eccentric part which is rotationally driven by the electric element, and a lower end of the crankshaft. A hermetic electric compressor comprising: an oil supply pipe having a centrifugal pump action made of a synthetic resin in a portion thereof; and the oil supply pipe is opened and rotated in refrigerating machine oil sealed in the closed container. 2. The hermetic electric compressor according to claim 1, wherein the oil supply pipe is joined to a lower end portion of the crankshaft by disposing an intermediate member made of a synthetic resin. And a crankshaft having an eccentric part and a main shaft, the compression element being elastically supported in the closed container and being electrically driven, the compression element being rotatably driven by the electric element.
A balance weight provided in the eccentric portion, and a concentric oil supply pipe having a pump action for performing concentric rotation with respect to a main shaft provided in the balance weight, wherein the concentric oil supply pipe is sealed in the closed container. A hermetic electric compressor that opens and rotates in machine oil. 4. The hermetic electric compressor according to claim 3, wherein the balance weight and the concentric oil supply pipe are integrated. 5. The hermetic electric compressor according to claim 3, wherein the concentric oil supply pipe is made of a synthetic resin. 6. The hermetic electric compressor according to claim 3, wherein an intermediate member made of a synthetic resin is disposed at a joint between the balance weight and the concentric oil supply pipe. 7. The hermetic electric compressor according to claim 3, wherein auxiliary means for enhancing a pumping action such as a coil spring is provided inside the concentric oil supply pipe.