JPH08261152A - Closed electric motor-driven compressor - Google Patents

Abstract

PURPOSE: To provide a closed electric motor-driven compressor of high efficiency and low noise which improves efficiency by performing cooling of a coil end part to prevent abnormal noise caused by dripping sound of lubricating oil. CONSTITUTION: A compressor comprises a frame 7 elastically supported in a closed vessel 1 of storing lubricating oil 11, electric motor part 2 provided in a lower part of the frame 7 and a compression mechanism part 3 provided in an upper part of the frame 7 to be connected to the electric motor part 2 through a crankshaft 6, also comprises a supply oil means of pumping upward the lubricating oil 11 by centrifugal force of the crankshaft 6 scattering on an upper part of the compression mechanism part 3, and have an oil drip hole 7c inserted through a lower surface from an upper surface of the frame 7. In a closed electric motor-driven compressor formed by providing an insulating member 14A between a lower surface where this oil dripping hole 7c is positioned and a coil end part 4e, lubricating oil, flowing out through the oil drip hole 7c, is guided to the coil end part 4e by a tongue piece-shaped notch 14b formed in the insulating member 14A.

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, which is incorporated in, for example, a refrigerating device such as a refrigerator to reduce the temperature of the electric motor winding during operation of the hermetic electric compressor or to reduce the noise of lubricating oil. The present invention relates to a hermetic electric compressor suitable for prevention.

[0002]

2. Description of the Related Art First, a conventional hermetic electric compressor will be described with reference to FIGS. 9 is a vertical cross-sectional view of a conventional hermetic electric compressor, and FIG. 10 is an enlarged view of a main part of FIG. Generally, as shown in FIG. 9, a hermetic electric compressor includes a frame 7 elastically supported via a spring 13 in a hermetic container 1 in which a lubricating oil 11 is stored, and a motor installed under the frame 7. It comprises a part 2 and a compression mechanism part 3 which is located above the frame 7 and which is connected to the electric motor part 2 via the crankshaft 6.

The electric motor section 2 is composed of a stator 4 and a rotor 5, which transmits rotational movement to the rotor 5 and an eccentric portion 6a.
A crank shaft 6 having (hereinafter referred to as a crank pin) is fitted. Further, the frame 7 that fixedly supports the compression mechanism portion 3 and has the bearing portion 7a of the crankshaft 6 is attached to the stator 4 of the electric motor portion 2. An insulating plate 14 for more reliably maintaining insulation is inserted between the frame 7 and the winding end portion (coil end portion 4e) of the stator 4.

Since the insulating plate 14 is mainly made of an electrical polyester film and is intended for electrical insulation, it has no cuts or holes other than the central portion into which the frame bearing portion 7a is inserted. Since the insulation is reliably maintained, the gap between the frame 7 and the coil end portion 4e can be set to the minimum, and therefore the outer dimension height of the closed container 1 can be reduced. There is. The compression mechanism section 3
A slider 8 for converting the rotary motion of the crankshaft 6 into a reciprocating motion, and a piston 10 for repeating the reciprocating motion in a cylinder 9 by the slider 8 are configured.

Lubricating oil 11 is stored at the bottom of the closed container 1. The lubricating oil 11 is sucked up by the rotation of the crankshaft 6 by the pump member 12 provided at the lower end of the crankshaft 6, and further the centrifugal force generated by the rotation is applied to the inner wall 6b of the shaft hole of the crankshaft 6. To rise. Lubricating oil raised 11
Is partly bearing bearing branch hole 6c, crank pin portion branch hole 6
After passing through d, it is supplied to a required sliding portion, and the remaining lubricating oil is scattered from the crankpin upper portion 6e and supplied to the entire compression mechanism portion 3, the closed container 1, and the frame 7.

Next, the flow path of the lubricating oil scattered and supplied to the frame 7 will be described in detail with reference to FIG. The arrows in the figure indicate the flow of lubricating oil. Electric motor 2 as described above
Rotation causes the lubricating oil to continuously scatter from the crankpin upper portion 6e and adhere to the upper surface 7b of the frame, which becomes a flow and the oil dropping hole 7c provided in the frame 7 through the insulating plate 1
It falls to 4. The lubricating oil is transmitted on the surface of the insulating plate 14, further transmitted to the stator upper end surface 4a and the stator wall surface 4b, and drops from the stator lower end surface 4c to the lubricating oil 11 stored in the inner bottom of the closed container 1. At this time, the lubricating oil 11 stored in the inner bottom of the closed container 1 from the lower end surface 4c of the stator
The drop distance to the oil surface is large, so an oil dripping noise is generated, which causes abnormal noise that is extremely detrimental to the hearing.

[0007]

Conventionally, a lubricating oil has been
For example, a device described in Japanese Patent Publication No. 57-12871 is known as a device using a means for guiding to the stator coil end portion through an oil dropping hole provided in a part of the cylinder. In this hermetic electric compressor, the shape of the coil end portion is formed by connecting the slots provided in the stator with a substantially straight line so as to pass through the center side of the stator to increase the surface area and to provide it in the frame. In addition, the lubricating oil from the oil dripping holes can be more reliably received, and the stator coil is effectively cooled.

Further, the lubricating oil surely drops onto the coil end, travels along the coil in the stator slot, and flows to the coil end below the stator. Then, it is dripped from the coil end at the lower part of the stator into the lubricating oil stored in the lower part inside the closed container. At this time, there was almost no drop distance, or the coil end was soaked in the lubricating oil stored in the lower portion of the closed container, so that the oil dropping noise could be prevented.

However, in the above-mentioned prior art, since the surface area of the coil end portion is increased, it is necessary to more surely maintain insulation from the frame, and an insulating member such as a polyester film for electrical use must be attached. Occurred. For this reason, the insulating member receives the lubricating oil dripping from the oil dripping hole of the frame, and the lubricating oil is not guided to the coil end portion but flows down the stator wall surface as it is, impeding the cooling effect of the coil end portion. Had become a factor to.
Also, when lubricating oil flows down the wall surface of the stator and drops from the lower end surface of the stator to the surface of the lubricating oil stored in the lower part of the closed container, the drop distance is large and an oil dropping noise is generated, which is an abnormal noise that significantly impairs hearing. There was a problem of inducing.

However, since the insulation is surely maintained by mounting the insulating plate, the advantage is that the gap between the coil end portion and the frame can be minimized, so that the outer dimensions of the closed container can be reduced. It was possible.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The present invention has a stator coil end and a frame.
Insulation members are installed between the cylinders to ensure insulation and reduce the height of the outer dimensions of the closed container, while improving the efficiency by cooling the coil end part Prevents induction of abnormal noise, high efficiency,
An object is to provide a low-noise hermetic electric compressor.

[0012]

In order to achieve the above object, the structure of the hermetic electric compressor according to the present invention comprises a frame elastically supported in a hermetic container storing lubricating oil, and a lower part of the frame. And a compression mechanism portion located above the frame and connected to the electric motor portion via a rotating shaft. The stored lubricating oil is pumped upward by the centrifugal force of the rotating shaft to perform lubrication. And an oil supply means that scatters above the compression mechanism,
A hermetic electric compressor having an oil drip hole penetrating from the upper surface to the lower surface of the frame, and an insulating member provided between the lower surface where the oil drip hole is located and the electric motor section, The lower surface is provided with means for guiding the lubricating oil flowing out through the oil dropping hole to the electric motor section.

More specifically, the means for guiding the lubricating oil to the electric motor portion is a tongue-like cut formed in the insulating member or a groove formed in the insulating member. Further, the flow direction of the lubricating oil due to the tongue-shaped notch or groove is guided to the winding of the electric motor.

[0014]

The function of the above technical means is as follows. According to the hermetic electric compressor of the present invention, the lubricating oil flowing from the upper surface to the lower surface of the frame through the oil dropping holes can be reliably guided to the winding of the electric motor, and the lubricating oil is supplied from the lower end of the winding of the electric motor. It is a small drop distance to the lubricating oil surface stored in the lower part of the closed container. Therefore, it is possible to improve the cooling effect of the electric motor winding by the lubricating oil and prevent the oil dropping noise because the lubricating oil falls a short distance. In addition, since an insulating member is provided to maintain the insulation between the frame and the electric motor, the gap between the frame and the electric motor can be minimized, the sealed container can be made compact, and high safety can be maintained. Is possible.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. [Embodiment 1] FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an enlarged view of an insulating member in FIG. FIG. 4 is a plan view and FIG. 4 is a sectional view taken along the line AA of FIG. In FIGS. 1 and 2, the same reference numerals as those in FIGS. 9 and 10 indicate the same parts as those in the prior art. The hermetic electric compressor shown in FIG. 1 includes a frame 7 elastically supported via a spring 13 in a hermetic container 1 storing a lubricating oil 11, an electric motor section 2 installed below the frame 7, and a frame. It is composed of a compression mechanism portion 3 which is located at the upper part of 7 and is connected to the electric motor portion 2 via a crankshaft 6.

The electric motor unit 2 is composed of a stator 4 and a rotor 5, which transmits rotational motion to the rotor 5 and an eccentric portion 6a.
A crank shaft 6 having (hereinafter referred to as a crank pin) is fitted. Further, the frame 7 that fixedly supports the compression mechanism portion 3 and has the bearing portion 7a of the crankshaft 6 is attached to the stator 4 of the electric motor portion 2. This frame 7 and the coil end portion 4e of the stator 4
An insulating plate 14A for more surely maintaining insulation is inserted between and.

The insulating plate 14A is mainly made of an electrical polyester film. By ensuring that insulation is maintained,
The gap between the frame 7 and the coil end portion 4e can be set to a minimum, and therefore the height of the outer dimension of the closed container 1 can be reduced. This insulating plate 14
As a means for guiding the lubricating oil to the coil end portion 4e, for example, a tongue-shaped cut 14b shown in FIGS. The compression mechanism section 3 includes a slider 8 for converting the rotational movement of the crankshaft 6 into a reciprocating movement, and the slider 8
Piston 10 that reciprocates in cylinder 9 by
It consists of.

Further, a lubricating oil 11 is stored at the bottom of the closed container 1. The lubricating oil 11 is sucked up by the rotation of the crankshaft 6 by the pump member 12 provided at the lower end of the crankshaft 6, and further the centrifugal force generated by the rotation is applied to the inner wall 6b of the shaft hole of the crankshaft 6. To rise. The lubricating oil 11 that has risen is partially supplied to the required sliding portion through the bearing branch hole 6c and the crank pin branch hole 6d, and the remaining lubricating oil is scattered from the crank pin upper portion 6e, and the compression mechanism portion. Three
The whole is supplied to the frame 7 in the closed container 1.

The flow of the lubricating oil scattered on the frame 7 will be described in detail with reference to FIG. The arrows in FIG. 2 indicate the flow of lubricating oil. Scatter from the top 6e of the crank pin
The lubricating oil supplied to the frame 7 once collects on the upper surface 7b of the frame, and then falls from the upper surface 7b of the frame into the oil dropping hole 7c penetrating to the lower surface thereof. It flows into the installed insulating plate 14A. By providing the insulating plate 14A with a means for guiding the lubricating oil to the coil end portion 4e (a tongue-shaped cut 14b, etc.), the insulating plate 14A is covered with the lubricating oil so that the lubricating oil does not flow into the coil end portion 4e of the electric motor. It is possible to reliably pour oil.

The lubricating oil flowing into the coil end portion 4e travels along the coil and reaches the coil end lower portion 4f. Since the lubricating oil is transmitted through the coil, the upper end surface 4a of the stator and the wall surface 4 of the stator
b does not flow out to the lower end surface 4 of the stator.
It does not fall from c to the oil surface of the lubricating oil 11 stored in the bottom of the closed container 1.

FIGS. 3 and 4 show a tongue-shaped cut 14b which is means for guiding the lubricating oil to the coil end portion. 3 and 4, 14a is a central hole into which the frame bearing portion 7a is inserted in the insulating plate 14A, 14b is a tongue-shaped cut formed by cutting and raising the insulating plate 14A, and 14c is a tongue-shaped cut. It is the tip. The tongue-shaped tip 14c is directed obliquely downward, and the tongue-shaped tip 14c is in contact with the coil end portion 4e.

The lubricating oil flowing into the insulating plate 14A travels through the tongue-shaped cut 14b, reaches the tongue-shaped tip 14c, and is reliably supplied to the coil end portion 4e. If the oil drip hole 7c is drilled right above the tongue-shaped cut 14b, the lubricating oil can be more surely dropped to the tongue-shaped cut 14b, and a larger amount of lubricating oil can be supplied to the coil end 4e. You can

The insulating plate 14A is mainly made of electrical polyester film. Therefore, the tongue notch 14b is easily deformed. Temporarily coil end part 4e
If the coil is disturbed, the tongue-shaped notch 14b is only pushed up from the bottom by the disordered coil and pushed upward, so that the insulation between the frame 7 and the coil end 4e is surely maintained, and No damage will occur.
Therefore, the gap between the frame 7 and the coil end 4e can be set to the minimum, and the shape of the closed container can be reduced.

[Embodiment 2] Another example of means for guiding the lubricating oil to the coil end portion will be described with reference to FIGS. FIG. 5 is an enlarged plan view of an insulating member in a hermetic electric compressor according to another embodiment of the present invention, and FIG. 6 is A ′ of FIG.
-A 'arrow sectional view, FIG. 7 is a BB arrow sectional view of FIG. A hermetic electric compressor to which this insulating member is applied is shown in FIG.
The description of the hermetic electric compressor is omitted because it is the same as that shown in FIG.

In the embodiment shown in FIGS. 5 to 7, the insulating plate groove 14d is formed in the insulating plate 14B as a means for guiding the lubricating oil to the coil end portion. The action of the insulating plate groove 14d is similar to that of the previous embodiment, and the lubricating oil flowing from the oil dropping hole 7c is guided by the insulating plate groove 14d and flows from the insulating plate groove tip 14e to the coil end 4e. Further, since the insulating plate groove 14d is also easily deformed, even if the coil at the coil end portion is disturbed, the insulating plate groove 14d is only pushed up, and the insulation between the frame 7 and the coil end 4e is prevented. Is maintained and does not damage the coil. Therefore, it is possible to set the gap between the frame 7 and the coil end 4e to the minimum and to reduce the size of the closed container.

[Embodiment 3] Still another example of means for guiding the lubricating oil to the coil end portion will be described with reference to FIG. FIG. 8 is an enlarged plan view of an insulating member in a hermetic electric compressor according to still another embodiment of the present invention. Since the hermetic electric compressor to which this insulating member is applied is the same as that shown in FIG. 1, the description of the hermetic electric compressor is omitted. In the above-mentioned two embodiments, the lubricating oil is guided to the coil end 4e more reliably, thereby contributing to the cooling of the coil end 4e.
In the example shown in FIG. 8, the tongue notch 4b is formed in the hole 14 at the center.
It is provided in the direction of the number of turns of a (eight directions in FIG. 8).

By providing the tongue-shaped notch 4b in the direction around the hole 14a at the center, the outflow direction of the lubricating oil is not biased in one direction, and the lubricating oil can be supplied to the entire coil end 4e, so that the end coil It is possible to cool the entire 4e on average. In this case, the oil dropping hole 7 of the frame 7
By installing c just above the tongue-shaped cut 4b,
Since a larger amount of lubricating oil can be dropped into the tongue-shaped cuts 4b, it is desirable to provide the oil dropping holes 7c as many as the tongue-shaped cuts 4b.

By adopting the structure of each of the above embodiments, the coil end 4e can be surely cooled, and the operation efficiency and reliability can be improved. Further, since the lubricating oil drops from the coil end lower portion 4f, the distance from the oil surface of the lubricating oil 11 stored in the lower portion of the closed container 1 is small, or the coil end lower portion 4f is lubricated in the lower portion of the closed container 1. Since it is immersed in the oil 11, it is possible to prevent induction of abnormal noise by preventing the oil dropping sound. Further, it is possible to achieve the same insulating effect as the conventional one and to minimize the gap between the frame 7 and the coil end 4e. Therefore, high efficiency, low noise, high safety, high reliability, and compact sealing can be achieved. Form electric compressor can be provided.

Further, in the conventional high-power type hermetic electric compressor, a copper pipe is formed into a horseshoe shape, a circular shape, or the like in the lubricating oil 11 stored in the lower portion of the hermetic container 1 for cooling. Then, a low-temperature refrigerant was circulated in the copper tube to cool it. However, by adopting the notch or groove structure of the insulating plate of the present embodiment, it is possible to suppress the temperature rise of the coil end 4e, and it is possible to eliminate the copper pipe piped in the lubricating oil 11. The structure of this embodiment is much cheaper than the structure in which a copper pipe is piped in the lubricating oil 11, and contributes to cost reduction.

[0030]

As described in detail above, according to the present invention, the insulating member is provided between the stator coil end and the frame to ensure the insulation, and the effect of reducing the height of the outer dimension of the hermetically sealed container. To improve efficiency by cooling the coil end while maintaining the temperature, prevent the induction of abnormal noise due to the dropping noise of lubricating oil, and provide a high-efficiency, low-noise hermetic electric compressor. You can

[Brief description of drawings]

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

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an enlarged plan view of an insulating member in FIG.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is an enlarged plan view of an insulating member in a hermetic electric compressor according to another embodiment of the present invention.

6 is a sectional view taken along the line A′-A ′ of FIG.

FIG. 7 is a sectional view taken along the line BB of FIG.

FIG. 8 is an enlarged plan view of an insulating member in a hermetic electric compressor according to still another embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view of a conventional hermetic electric compressor.

10 is an enlarged view of a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Airtight container, 2 ... Electric motor part, 3 ... Compression mechanism part, 4 ... Stator, 4a ... Stator upper end surface, 4b ... Stator wall surface, 4c ...
Lower end surface of stator, 4e ... Coil end portion, 4f ... Coil end lower portion, 5 ... Rotor, 6 ... Crank shaft, 6a ...
Crank pin, 6b ... Shaft hole inner wall, 6c ... Bearing part branch hole,
6d ... Crank pin portion branch hole, 6e ... Crank pin upper portion, 7 ... Frame, 7a ... Frame bearing portion, 7b ... Frame upper surface, 7c ... Oil drop hole, 8 ... Slider, 9 ... Cylinder, 10 ... piston, 11 ... lubricating oil, 12 ... pump member, 13 ... spring, 14A, 14B, 14C ... insulating plate, 1
4b ... Tongue-shaped notch, 14c ... Tongue-shaped tip, 14d ...
Insulating plate groove, 14e ... Tip of insulating plate groove.

Claims (4)

[Claims] 1. A frame elastically supported in a hermetically sealed container storing lubricating oil, an electric motor unit provided at a lower portion of the frame, and a compression unit provided at an upper portion of the frame and connected to the electric motor unit via a rotary shaft. And a lubrication means for pumping the stored lubricating oil upward by the centrifugal force of the rotating shaft to supply it to the lubricating part and scattering it at the upper part of the compression mechanism part, from the upper surface to the lower surface of the frame. In a hermetic electric compressor having an oil drip hole penetrating therethrough and an insulating member provided between the lower surface where the oil drip hole is located and the electric motor section, the oil drip hole is provided from the upper surface to the lower surface of the frame. A hermetic electric compressor comprising means for guiding lubricating oil flowing out to the electric motor section. 2. The hermetic electric compressor according to claim 1, wherein the means for guiding the lubricating oil to the electric motor section is a tongue-like cut formed in the insulating member. 3. The hermetic electric compressor according to claim 1, wherein the means for guiding the lubricating oil to the electric motor section is a groove formed in the insulating member. 4. The hermetic electric compressor according to claim 2, wherein the lubricating oil flow direction by the tongue-shaped notch or groove is guided to the winding of the electric motor.