JP2000213483A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor which can improve quality of compression coolant by preventing oil injected from an upper gas vent hole from ascending together with coolant gas and reaching a discharge hole. SOLUTION: A balance weight 40 is arranged along a circumference on a lower portion of a rotor 6 of a motor with specified thickness, for shielding oil 20c injected from a gas vent hole 3c of a crankshaft 3 toward the outside. The balance weight 40 has a groove 40a on its inner peripheral surface extended in the direction of a center axis of the crankshaft 3, and a sprashed oil shielding part 40b formed so as to be projected upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a rotary compressor provided with a balance weight used for shielding oil blown out from a vent hole of a crankshaft.

[0002]

2. Description of the Related Art Conventionally, there has been used a rotary compressor 101 having a motor and a rotary compression element that transmits a rotational force of the motor through a crankshaft and compresses a refrigerant gas. First, the structure and operation of a conventional rotary compressor 101 will be described with reference to FIG. In the rotary compressor 101, the crankshaft 103 rotates with the rotation of a motor having a stator 107 and a rotor 106 provided inside a casing 150.

Accordingly, a front head 111, a rear head 112, and a cylinder 113 formed between the front head 111 and the rear head 112 are formed.
As the crankshaft 103 rotates, the inside of the cylinder chamber 104, which is a space for compressing the refrigerant,
The cylindrical eccentric pin 115 provided eccentrically to 3 rotates. The rotation of the eccentric pin 115 causes the eccentric pin 1 to rotate.
A cylindrical roller 116 revolves around the inside of the cylinder chamber 104 while being in contact with the outer periphery of 15.

[0004] As the roller 116 revolves, the refrigerant gas sucked from the refrigerant gas suction pipe 118 is supplied to the cylinder chamber 104.
Compressed internally. When the compressed refrigerant reaches a predetermined pressure, it pushes up a valve provided on the upper surface of the front head 111 to open a discharge port, whereby the muffler 117 is opened.
From the space surrounded by the primary space 105 and the air gap 10
8, sequentially pass through the secondary space and the discharge pipe and are sent to the condenser.

[0005] In the rotary compressor 101 as described above, the oil 120 sucked up from the oil sump 102 rises on the inner surface of the cavity 103a provided inside the crankshaft 103 while rotating by the centrifugal force of the crankshaft 103. Then, from the hole 103b provided in the crankshaft 103,
Oil is supplied as oil 120 a into each sliding portion and the cylinder chamber 104.

Excess oil 120b other than the oil 120a supplied to each sliding portion and the cylinder chamber 104 further rises in the cavity 103a and rises to the top of the cavity 103a.
Further, a gas vent hole 103c for discharging the refrigerant gas 130 dissolved in the oil 120 and the surplus oil 120b is provided at the top of the cavity 103a. Therefore, when the rotary compressor 101 is operated, the gas vent holes 10
3c, the oil 120 together with the refrigerant gas indicated by arrow 130
c blows out. After being blown out, the blown oil 120c is reused by dropping and returning to the oil sump 102 from a gap in the primary space 119 outside the cylinder 104.

[0007]

In the above rotary compressor, the oil 120c spouted from the gas vent hole 103c
Is provided with a balance weight 140 on the lower surface of the rotor 106, but is not installed at a position where the jetted oil collides, so that the arrow 16 discharged from the discharge hole 17a
0 rises with the refrigerant gas shown in FIG.
In some cases, the air may be sent to the discharge port through the secondary space through the air gap 108 between the stator 06 and the stator 107. When such a state occurs, the oil contained in the compressed refrigerant gas indicated by the arrow 160 increases, causing performance degradation in the system, and reducing the amount of oil in the oil sump 102, thereby reducing the sliding portion of the compressor. There is also a risk of lowering the reliability of the device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent oil ejected from an upper gas vent hole from rising together with a refrigerant gas and reaching an outlet. It is another object of the present invention to provide a rotary compressor capable of improving the quality and performance of the compressor.

[0009]

The rotary compressor according to the present invention is driven by an electric element having a rotor and a drive shaft rotating with the rotor in a closed casing, and a drive shaft. A compression element for compressing the refrigerant gas in the cylinder chamber. The drive shaft is
It has a vent hole for discharging the oil sucked from the lower oil reservoir to the outer periphery. A balance weight is attached near the outer edge of the end of the rotor on the compression element side, and further,
The balance weight is provided so that fluid blown out from the gas vent hole of the drive shaft to the outside collides.

[0010] With such a structure, the oil ejected from the gas vent hole collides with the balance weight functioning as an oil collision portion, and thereafter liquefies and falls. Therefore, it is possible to suppress the oil component ejected from the gas vent hole from rising in the direction of the discharge pipe together with the refrigerant gas ejected from the gas vent hole. As a result, the purity of the compressed refrigerant gas increases, and the performance of the rotary compressor improves. In addition, since the collision portion is formed using the balance weight to collide the oil jetted from the gas vent hole, the number of parts does not increase.

According to a second aspect of the present invention, there is provided the rotary compressor according to the first aspect, wherein the balance weight is provided on the inner peripheral surface on the gas vent hole side in the same direction as the center axis of the drive shaft. An extending groove is formed.

With such a structure, the oil spouted from the gas vent hole collides with the balance weight functioning as an oil shielding plate, liquefies, and falls along the groove of the balance weight. At this time, if the oil squirting into the groove of the balance weight collides, the oil does not scatter and falls from the groove as a large lump, so that the scattered oil may rise to the discharge port together with the refrigerant gas. Is suppressed. Further, since the shield plate rotates with the rotation of the rotor and the crankshaft, the oil jetted from the gas vent hole always collides with the groove. This suppresses the oil from scattering and rising after the collision.

According to a third aspect of the present invention, there is provided the rotary compressor according to the first or second aspect, wherein the rotor is provided at a compression element side end of the rotor with a balance weight smaller than a balance weight. It has an air hole formed to open on the inside. Further, the balance weight is further provided with an oil rising shielding portion protruding inward at a base end portion.

With such a structure, the oil rising shielding portion prevents the oil from scattering in the direction of the air hole provided in the rotor. This suppresses the oil spouting from the vent holes from rising from the air holes provided in the rotor. As a result, the refrigeration capacity of the rotary compressor is further improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary compressor according to an embodiment of the present invention will be described below with reference to FIGS. First, the structure and operation of the rotary compressor according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the rotary compressor 1 of the present embodiment has a motor having a stator 7 and a rotor 6, and rotational force from the motor is transmitted by a crankshaft 3, and a refrigerant gas is introduced into a cylinder chamber 4. And a rotary compression element for compression.

In the rotary compressor 1, the crankshaft 3 rotates with the rotation of the motor having the stator 7 and the rotor 6 provided inside the casing 50. Thereby,
As the crankshaft 3 rotates, the inside of the cylinder chamber 4, which is a space for compressing the refrigerant gas, formed by the front head 11, the rear head 12, and the cylinder 13 sandwiched between the front head 11 and the rear head 12, A cylindrical eccentric pin 15 provided eccentrically on the crankshaft 3
Rotates.

The rotation of the eccentric pin 15 causes the cylindrical roller 16 to revolve in the cylinder chamber 4 while being in contact with the outer periphery of the eccentric pin 15. Due to the revolution of the roller 16, the refrigerant gas sucked from the refrigerant gas suction pipe 18 is supplied to the cylinder chamber 4.
Compressed internally. When the compressed refrigerant gas reaches a predetermined pressure, it pushes up a valve provided on the upper surface of the front head 11 to open a discharge port, thereby causing the muffler 17 to open.
Are sequentially passed through the primary space 5, the air gap 8, the secondary space 9, and the discharge pipe 10 from the space surrounded by the circle, and sent to the condenser.

As shown in FIG. 2, the rotary compressor 1 of the present embodiment as described above has a balance weight 4 having a predetermined thickness along the outer peripheral edge of the lower part of the rotor 6 of the motor.
0 is provided. The balance weight 40 is
It also functions as a shielding plate that shields the oil 20c that blows out from the gas vent hole 3c of the crankshaft 3 attached to the rotor 6 of the motor. In addition, balance weight 4
Numeral 0 has a groove 40a of a predetermined width formed in a direction parallel to the crankshaft 3 on the inner peripheral surface of the balance weight 40 as shown in FIG. In addition, balance weight 4
In the case of 0, the oil rising shielding portion 40b is formed so that the oil 20d does not scatter in the direction of the air hole 6a provided in the rotor 6.

By adopting such a structure, as shown in FIGS. 1 and 2, the oil 20c ejected from the gas vent hole 3c into the primary space 5 and scattered is used as a balance weight 40 functioning as an oil shielding plate. Colliding with large oil 20
d, and falls along the groove 40a of the balance weight 40. Therefore, the oil 2 squirted into the primary space 5 and scattered
0c does not rise to the secondary space together with the refrigerant gas indicated by the arrow 60 discharged from the discharge hole 17a. as a result,
The purity of the refrigerant gas indicated by the arrow 60 increases, and the performance of the rotary compressor 1 improves. Further, since the oil is shielded by using the balance weight 40, the number of parts does not increase.

Since the balance weight 40 rotates with the rotation of the rotor 6 and the crankshaft 3, the oil 20c ejected from the gas vent hole 3c always collides with the groove 40a. Thereby, scattering of the oil 20d which has become a large lump after the collision is more reliably suppressed. In addition, since it is desired to provide the protruding portion 40b, the scattering of the oil 20d in the direction of the air hole 6a provided in the rotor 6 is suppressed. As a result, the purity of the compressed refrigerant gas can be increased, so that a rotary compressor with improved refrigeration capacity can be provided.

Further, as described above, since the oil does not rise in the direction of the discharge pipe 10 together with the refrigerant gas, the oil 20c ejected from the gas vent hole 3c becomes a large lump of oil 20d and is returned to the oil sump 2 In addition, the reliability and performance of the rotary compressor are improved.

It should be noted that the embodiment disclosed this time is an example in all respects and is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0023]

According to the rotary compressor of the first aspect of the present invention, the oil ejected from the gas vent hole is made to collide with the collision part by using the balance weight and is returned as a large lump to be recirculated. Since the purity of the compressed refrigerant can be increased without increasing the score, the performance and reliability of the rotary compressor are improved.

According to the rotary compressor of the second aspect of the present invention, the oil jetted from the gas vent hole and colliding with the groove portion does not scatter to the side, but falls from one location as a large lump. Therefore, it is difficult to rise to the discharge port together with the refrigerant gas.

According to the rotary compressor of the third aspect of the present invention, the oil spouted from the gas vent hole collides with the oil rising shielding portion, so that the oil scatters in the direction of the air hole provided in the rotor. Therefore, the oil serving as the lubricating oil is more easily returned to the oil sump, and the performance and reliability of the rotary compressor are further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotary compressor using a balance weight of a rotor as an oil shielding plate in an embodiment of the present invention.

FIG. 2 is an enlarged view showing a state in which an oil shielding plate is provided on a rotor in the embodiment of the present invention.

FIG. 3 is a perspective view of a balance weight having a groove used as an oil shielding plate in the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional rotary compressor having a balance weight.

[Explanation of symbols]

 Reference Signs List 3 Crankshaft 3c Gas vent hole 4 Cylinder chamber 6 Rotor 11 Front head 12 Rear head 13 Cylinder 20a, 20b, 20c, 20d Oil 30, 60 Refrigerant gas 40 Balance weight 40a Groove 40b Oil rise shielding portion

Claims (3)

[Claims] An electric element having a rotor (6) and a drive shaft (3) rotating together with the rotor (6) in a closed casing (50); and a cylinder chamber driven by the drive shaft (3). (4)
A compression element for compressing the refrigerant gas therein, wherein the drive shaft (3) has a gas vent hole (3c) for discharging the oil sucked from the lower oil reservoir (2) to the outer periphery, and the rotor A balance weight (40) is attached near the outer edge of the compression element side end of (6), and the balance weight (40) is directed outward from the gas vent hole (3c) of the drive shaft (3). A rotary compressor provided so that fluids (20c, 30) to blow out collide. 2. A groove (40a) extending in the same direction as a center axis of the drive shaft (3) is formed on an inner peripheral surface of the balance weight (40) on the side of the gas vent hole (3c). Item 4. The rotary compressor according to Item 1. 3. The rotator (6) includes the rotator (6).
At the end of the compression element side of the airbag, there is provided an air hole (6a) formed so as to open inside the balance weight (40).
At the base end, the oil rising shielding part (40
The rotary compressor according to claim 1, wherein b) is further provided.