JPH073231B2 - Hermetic scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hermetic scroll compressor used as a refrigerating compressor for refrigeration and air conditioning, or a compressor for helium, and particularly to the outside of the oil from the compressor. The present invention relates to a hermetic scroll compressor that prevents outflow of oil in a compressor, which prevents outflow, and improves cooling performance of an electric motor.

[Conventional technology]

In a conventional hermetic scroll compressor, as described in JP-A-60-243389, a partition plate for gas collision is provided above the motor stator, and the refrigerant gas compressed by the scroll compression mechanism is discharged at the upper part. The chamber is led to the electric motor chamber through the communication passage and the partition plate, and then the refrigerant gas is made to flow from the discharge pipe of the compressor to the outside through the periphery of the upper coil end of the electric motor.

[Problems to be solved by the invention]

In the above conventional technique, the presence of the partition plate makes it difficult for the refrigerant gas to flow to the lower side of the electric motor, and the cooling action of the electric motor by the refrigerant gas is impaired. For this reason, there arises a problem that the winding temperature at the lower part of the motor remarkably rises under an overload pressure condition which becomes severe as an operating condition, that is, a condition in which both the suction pressure and the discharge pressure are the upper limit values of the design pressure.

An object of the present invention is to provide a hermetic scroll compressor capable of improving the cooling action of the entire electric motor without increasing the amount of oil rising in the compressor.

[Means for solving problems]

The object is to attach a frame having a U-shaped cross section to the inner surface of the side wall of the closed container, and to form a gas guide passage for guiding the compressed gas reaching the lower container chamber (electric motor chamber) to the electric motor coil end portion by attaching the frame and the side wall. This is achieved by providing a flow dividing plate that divides the compressed gas flowing through the gas guide passage into a flow directed to the side surface of the motor coil end and a flow directed in the vertical direction of the outer peripheral portion of the motor stator.

[Action]

The compressed gas guided to the upper motor chamber flows into the gas guide passage, flows through it, and then is divided by the flow dividing plate.One of them collides directly with the side surface of the motor coil end, separating the oil contained in the compressed gas. To be done. The compressed gas from which the oil has been separated passes through the space between the outer peripheral portion of the upper coil end of the electric motor and the inner surface of the side wall of the closed container, and goes toward the discharge pipe. The other part of the shunt flows in the vertical direction of the outer peripheral part of the electric motor, and then flows around the outer peripheral part of the stator and the lower coil end in a parabolic trajectory to cool the entire electric motor. As a result, the amount of oil discharged from the compressor can be reduced and the cooling effect of the entire electric motor can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 is a vertical sectional view of a hermetic scroll compressor according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG.
FIG. 4 is a perspective view showing a frame forming the gas guide passage and a mounting portion of the flow distribution plate, and FIG. 4 is a partial cross-sectional view around the gas guide passage. In the figure, a compressor unit 10 is provided above the inside of the closed container 1.
0 indicates that the electric motor unit 3 is housed below. The closed container 1 is divided into an upper chamber 1a (discharge chamber) and electric motor chambers 1b and 1c.

In the compressor unit 100, the fixed scroll member 5 and the orbiting scroll member 6 are meshed with each other to form a compression chamber (closed space) 7. The fixed scroll member 5 is composed of a disk-shaped end plate 5a and a wrap 5b which stands upright on the end plate 5a and is formed in an inward curve or a curve similar thereto, and has a discharge port at the center thereof.
10, the suction port 16 is provided on the outer peripheral portion. The orbiting scroll member 6 is composed of a disk-shaped end plate 6a, a wrap 6b standing upright on the end plate 6a and formed in the same shape as the fixed scroll wrap, and a boss 6c formed on the non-wrap surface of the end plate. The frame 11 has a bearing portion formed in the center, and the rotating shaft is attached to this bearing portion.
14 is supported, and the eccentric shaft 14a at the tip of the rotary shaft is attached to the boss 6c.
It is inserted so that a turning movement is possible. The fixed scroll member 5 is fixed to the frame 11 by a plurality of bolts, the orbiting scroll member 6 is supported by the frame 11 by an Oldham mechanism 12 including an Oldham ring and an Oldham key, and the orbiting scroll member 6 is fixed to the fixed scroll member 5. Thus, it is formed so as to make a turning motion without rotating. An electric motor shaft 14b fixed to the rotor 3b is integrally connected to the lower portion of the rotary shaft 14, and the electric motor portion 3 is directly connected to the suction port 16 of the fixed scroll member 5 which penetrates the hermetically sealed container 1. The upper chamber 1a, to which the vertical suction pipe 17 is connected and the discharge port 10 is opened, communicates with the upper electric motor chamber 1b through passages 18a and 18b. The upper electric motor chamber 1b communicates with the lower electric motor chamber 1c via a passage 19 between the electric motor stator 3a and the side wall of the closed casing 1. Also the upper motor room 1b
Is connected to a discharge pipe 20 which penetrates the closed container 1.

Reference numeral 11a denotes a frame pedestal for fixing the electric motor 3 to the frame side, and 22 denotes an oil sump at the bottom of the closed container. The closed container 1 is formed of an upper end plate 2a, a body part 2b, and a lower end plate 2c.

On the other hand, a frame 23 having a U-shaped cross section is formed on the inner surface of the side wall 2b of the closed container 1.
Is attached to the lower container chamber 1b by the frame 23 and the side wall 2b.
Forming a gas guide passage 24 for guiding the compressed gas reaching to the motor coil end portion 3c. Further, a flow distribution plate 23b is provided for dividing the compressed gas flowing through the gas guide passage 24 into a flow toward the outer surface of the motor coil end 3c and a flow toward the outer peripheral portion of the motor stator 3a in the vertical direction. This diversion board 23b
Are formed integrally with the frame 23. The frame 23 is fixed to the side wall 2b via a mounting seat 23a.

In the figure, the solid line arrow indicates the flow direction of the refrigerant gas, and the broken line arrow indicates the oil flow direction.

Next, the operation of this embodiment will be described.

The refrigerant gas introduced from the suction pipe 17 to the suction port 16 is compressed by the compressor unit 2
After being compressed in the compression chamber 7, it is discharged from the discharge port 10 to the upper chamber 1a and guided to the upper electric motor chamber 1b through the passages 18a and 18b. The refrigerant gas flows into the gas guide passage 24 and flows there through, and then reaches the flow dividing plate 23b, where it is divided into a flow to the opening 25a of the frame 23 and a flow to the opening 25b of the frame 23. . The refrigerant gas flowing out from the opening 25a directly collides with the outer surface of the motor coil end 3c, and the oil contained in the refrigerant gas is separated. The refrigerant gas from which the oil has been separated passes through the space between the outer peripheral portion of the motor coil end 3c and the inner peripheral surface of the side wall 2b of the closed casing 1 toward the discharge pipe 20. On the other hand, the refrigerant gas flowing out from the opening 25b exhibits a vertical flow flowing into the space 19 at the outer peripheral portion of the electric motor stator 3a, and flows around the electric motor coil end 3f in a parabolic trajectory, and in this process, the entire electric motor. Cool down. FIG. 5 shows the flow of the refrigerant gas in the closed container 1.

Therefore, in the present embodiment, it becomes possible to properly distribute the amount of refrigerant gas flowing in the upper space of the motor and the amount of refrigerant gas flowing in the lower space of the electric motor and the space around the outer periphery of the electric motor stator, thereby reducing the oil discharge amount of the compressor. In addition, the cooling effect of the entire electric motor can be improved.

The distribution of the gas flow rate is determined by the opening area ratio between the openings 25a and 25b of the frame 23. Therefore, an experiment was conducted to find the optimum opening area ratio.
The opening area of a is 10 times larger than the opening area of opening 25b.
It was confirmed that it is preferable to set the ratio to about 20 times.

Here, the opening area ratio S is a value given by the following equation.

It was also confirmed that the opening area ratio S at which the motor cooling is practically sufficient and the amount of oil rise is low is in the range of 0.05 to 0.1 as shown in FIG. As you can see from Figure 6,
When the opening area ratio S becomes larger than 0.1, the amount of oil rise sharply increases, but the effect of lowering the motor winding temperature tends to become slightly smaller. Practically, the opening area ratio of the gas guide passage 23 is optimally around S≈0.08.

Further, as shown in FIGS. 3 and 4, the vertical dimension lc of the opening 25a is set to be substantially the same as the vertical length lm of the motor coil end 3c, and the horizontal dimension la of the opening 25b is set to the horizontal dimension B of the frame 23. 1/2 of
The width dimension W and the lateral dimension B of the frame 23 are appropriately determined in relation to the shape of the communication passage 18 so that the gas flow velocity in the gas guide passage 24 is approximately 3 to 5 m / s. It was also confirmed that by determining the size of the frame 23, the oil separation effect due to the collision action can be further enhanced.

Further, in the present embodiment, the frame 23 and the flow distribution plate 23b
Mass production (assembling) because the and are integrated
Can be improved.

FIG. 7 shows a modification of the frame, which differs from FIG. 3 in that
The mounting seat of the frame is eliminated, and the end face of the side plate of the frame 23 is directly sealed.
Is welded to the side wall 2b of the.

〔The invention's effect〕

As described above, according to the present invention, it is possible to reduce the oil rising amount of the compressor and to improve the cooling effect of the entire electric motor. As a result, the refrigeration cycle as a whole has improved performance (cooling capacity due to reduction of pressure loss in piping,
It has the effect of improving the heating capacity, and consequently the coefficient of performance EER), and significantly improves the reliability of the compressor itself.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a vertical sectional view of a hermetic scroll compressor according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. 3 is a perspective view showing a frame forming a gas guide passage and a mounting portion of a flow distribution plate, FIG. 4 is a partial cross-sectional view around the gas guide passage, and FIG. 5 is a cross-section showing gas flow in a closed container. FIG. 6 is a diagram showing the effect of the present invention, and FIG. 7 is a perspective view showing a modified example of the frame. 1 ... Airtight container, 2b ... Side wall, 3 ... Electric motor, 5 ... Fixed scroll, 6 ... Orbiting scroll, 23 ... Frame, 23b
...... Diversion plate, 24 ...... Gas guide passage, 25a, 25b ...... Opening

Claims (3)

[Claims] 1. A scroll compressor and an electric motor are continuously installed and housed in a closed container via a rotary shaft supported by a frame, and a closed container chamber is divided into an upper chamber and a lower chamber. A fixed scroll member and an orbiting scroll member that stand upright in a spiral wrap on the plate-like end plate are engaged with each other with the wrap inside, and the orbiting scroll member is engaged with an eccentric shaft portion that is continuous with the rotating shaft to rotate the orbiting scroll member on its own axis. Without rotating the fixed scroll member, the fixed scroll member is provided with a discharge port that opens in the center and an intake port that opens in the outer periphery. Compress the gas by moving it around the compression space to reduce the volume, discharge the compressed gas from the discharge port to the upper container chamber, guide it to the lower container chamber through the passage, and discharge it outside the device through the discharge pipe. In the closed scroll compressor, a frame having a U-shaped cross section is attached to the inner surface of the side wall of the closed container, and the frame and the side wall form a gas guide passage for guiding the compressed gas reaching the lower container chamber to the motor coil end portion, Further, a hermetic scroll compressor is provided, which is provided with a flow dividing plate that divides the compressed gas flowing through the gas guide passage into a flow toward a side surface of the motor coil end and a flow toward a vertical direction of an outer peripheral portion of the motor stator. . 2. The hermetic scroll compressor according to claim 1, wherein the flow dividing plate is formed integrally with the frame. 3. The gas flow passage opening for directing gas to the motor coil end portion according to claim 2, wherein the size of the gas flow passage opening for directing gas in the vertical direction on the outer peripheral portion of the electric motor stator. About 0.05 to 0.1
Hermetic scroll compressor with a ratio in the range of.