JPS5918286A - Scroll compressor - Google Patents

Abstract

PURPOSE:To increase reliability by a method wherein a hole, communicating a motor chamber with a flow path, is provided to flow suction gas, whose amount is necessary to cool the motor at the minimum, into an air gap and bypass the remaining gas into a suction chamber. CONSTITUTION:A part of the suction gas, introduced into the motor chamber 19, passes through the air gap 25 and a venting hole 28, as shown by arrow signs, thereafter, is turned to pass through the flow path 26 and is sucked into the suction chamber 6. The remaining suction gas enters into the flow path 26 directly through the communicating hole 29 and is sucked into the suction chamber 6. Consequently, the flow amount of the suction gas, colliding against an oil reservoir 23, is small and the flow speed thereof is also low, therefore, the scattering of oil may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the flow direction of suction scum in a scroll compressor used in a refrigerant compressor.

Before entering into the description of this invention, the principle of a scroll compressor will be briefly described.

The basic elements of a scroll compressor are shown in Figure 1, in which 2 is a fixed scroll, 2 is an oscillating scroll,
5 is a compression chamber formed by a gap between the fixed scroll 1 and the swinging scroll 2; 0 is the center of the fixed scroll 1;

The fixed scroll 1 and the oscillating scroll 2 have spirals of the same shape but opposite winding directions, and the shape of these spirals is a combination of seven involutes or circular arcs, and by combining these spirals, both spirals can be formed. A compression chamber 5 is formed in between.

Next, the operation will be explained. In FIG. 2, the fixed scroll 1 is stationary with respect to space, and the oscillating scroll 2
is combined with a fixed scroll l as shown in the figure, and its attitude does not change with respect to the space (・, that is, the rotational motion χ
Instead, the fixed scroll 1 performs a rotational movement, that is, a swinging movement, around the center 0, and moves as shown in FIG. 1 abcde. Along with such movement of the swinging scroll 2, the compression chamber 5&! The volume is sequentially reduced by 2, and the gas taken into the compression chamber 5 from the outer periphery is compressed to near the center of the fixed scroll 1 and discharged.

Next, a specific example of a conventional scroll compressor will be explained with reference to FIG. Fig. 2 is a concrete example in which the scroll compressor is applied to engineering, eg, refrigeration, air conditioning, or a 9-gas compressor, and is configured as a compressor for a gas such as fluorocarbon. . In the same figure, 1
2 is a fixed scroll, 2 is an oscillating scroll, and 3 is an oscillating scroll 20 base plate, which has a diametrical groove ba on the back surface.

4 is an oscillating scroll shaft, 5 is a compression chamber, 6 is a suction part of the compression chamber 5, 7 is a ring attached slightly apart from the back surface of the oscillating scroll base plate 3, and 8 is a ring that controls the rotation of the oscillating scroll 2. It is a ring-shaped Oldham joint that prevents and swings, and has protrusions 8a and sb arranged in a cross shape on the earthwork surface. 9 is a thrust bearing that supports the back surface of the oscillating scroll base plate 3;
Reference numeral 10 denotes a bearing support, which fixes the fixed scroll 1 with bolts or the like, and is fixed to the shell by a method such as press fitting, which will be described later.
1 is the base plate 3? 12 is an Oldham chamber formed between the bearing support 10 and the ring 7χ, and 12 is an oil return hole 13 that communicates with the Oldham chamber 11 bored in the bearing support 10 and the motor chamber, which will be described later.
a is the motor stator mounted on the bearing support lO, ta
14 is a motor rotor, 14 is a crankshaft, 15 is an oil hole provided eccentrically in the crankshaft 14, 16 is an oscillating bearing provided eccentrically in the crankshaft 14 and fitted into the oscillating scroll shaft 4, and 17 is an oscillating bearing. 18 is a motor side bearing that also fits into the middle part of the crankshaft 14; 19 is a bearing support lO and motor stator 13;
a% and the motor chamber 13b, 20 is a first balance fixed to the upper part of the motor rotor 13b, and 21 is also fixed to the lower part of the motor rotor 13b.
T2 second balance, 22 is bearing support 10'4?
I ~ is the shell that seals the whole compressor χ, 23 is the shell 22
An oil reservoir provided at the bottom; 24 is a suction pipe that communicates with the remoter chamber 19 from the outside of the shell 22; 25 is a motor stator 1;
3a and the motor rotor 13b, 26 is a constant flow path partially provided between the bearing support 10 and the shell 22, and 27 discharges gas to the outside of the approximately central part of the fixed scroll 1. T rice discharge pipe, 2
8 is a ventilation hole penetrating the motor row 421-1b.

The operation of the Nuclor compressor constructed in this way will be explained below.

First, when the motor stator 13a is energized, the motor 5't
:l-113b generates torque and drives the crankshaft 14χ. When the crankshaft 14 begins to rotate, it is fitted into a swing bearing 16 eccentrically provided on the crankshaft 14.

Torque is transmitted to the oscillating scroll shaft 4, and the oscillating scroll 2 is guided by the Oldham joint 8 to perform two oscillating movements, thereby performing a compression action as shown in FIG. Gas enters the motor chamber 19 from the suction pipe 24 at J:5, indicated by a solid line in the figure, and enters the air gap 25 and the vent hole 2.
The motor stator 13a and motor rotor 13b are cooled while passing through the oil sump 23, and the direction of the heat is reversed at the upper part of the oil sump 23, and the oil is sucked into the rear suction chamber 6 through the flow path 26, and is then peered into the compression chamber 5, where it cools the crankshaft. A discharge pipe 27J is sequentially fed inward as the shaft 14 rotates and is provided in the center of the fixed scroll l.
: It is ejected.

Next, the oil supply system will be explained. The oil collected in the oil sump 23 is eccentrically drilled in the crankshaft 14 and is sucked up from the lower end of the crankshaft 14 by the pump action of the oil hole 15 [, J: S, indicated by the dashed arrow in the figure, Oil hole 15 and rocking bearing 16. It is supplied to the main bearing 17 and the motor side bearing 18, and after passing through these, it is supplied to the thrust bearing 9 to lubricate the thrust bearing surface, and then discharged into the Oldham chamber 11. The oil accumulated in the Oldham chamber 11 passes through the oil return hole 12 and falls into the motor chamber 19, and then returns to the oil reservoir 23 through the air gap 25ya1'.

, the oscillating scroll 2 accompanying the rotation of the crankshaft 14
The oscillating motion of the compressor tends to cause unbalanced vibrations throughout the compressor, but the first balance is 2°8. J: The crankshaft 14 times can balance χ with the second balance 21.'4 Second, the abnormally shaken compressor is operated.

In the conventional scroll compressor configured as shown in FIG.
The oil flows into the upper part of the oil sump 23 through the air vent hole 28, collides with the oil in the oil sump 23, reverses direction, passes through the flow path 26, and is sucked into the suction chamber 6. On the other hand, since the oil in the oil reservoir 23 is constantly stirred by the rotation of the crankshaft 14,
As shown in FIG. 2, the oil surface is not stationary, but rotates within the oil sump 23, and some of it is scattered as oil droplets. - Since the passage area of the air gap 25 and the vent hole 28 is relatively small, the flow velocity of the suction gas passing through these parts increases, and in this state it collides with the oil in the oil sump 23. Due to the force of the inhaled gas, some of it is blown away. The oil thus scattered is carried by the suction gas, passes through the flow path 26"1 together with the suction gas, and is sucked into the suction chamber 6. Since the oil is discharged outside the compressor, the amount of oil in the oil sump 23 gradually decreases, and in extreme cases, the amount of oil pumped up from the oil hole 16.J: becomes insufficient and the amount of oil supplied to the bearings becomes insufficient, making it impossible to perform safe operation. I can't do it (naru).

1-Generally, when a motor performs work Z, it generates heat, but in a conventional scroll compressor, the suction gas flows through the air gap 25.
This heat is taken away when the gas passes through the motor stator 13a and the air passage 28χ, and the suction gas passes through the outer periphery of the motor stator 13a and the flow path 28χ.
6 Even when the heat passes, I take away this heat, and it becomes J:'). Therefore, the motor was sufficiently cooled, and there were no problems with the reliability of the motor itself.However, as mentioned above, the temperature of the suction gas, which has taken away heat during the generation of the motor, increases accordingly, and the In other words, the gas becomes diluted and is inhaled into the suction chamber 6.
When the suction gas is sucked into the compression chamber 5, the weight flow rate of the suction gas sucked per revolution of the crankshaft decreases, resulting in a decrease in the capacity of the compressor.

This invention was made in view of the above-mentioned drawbacks, and by providing a communication hole that communicates the motor chamber and the flow path, it is possible to reduce the suction gas air gap 25 necessary to cool the motor to a minimum. The present invention aims to provide a highly reliable, high-performance compressor constructed in such a way that the air flows into the air passage and the air vent, and the remaining air is bypassed from the flow path to the suction chamber.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, 29 is a communication hole between the motor chamber 19 and the flow path 26. In this figure, the same reference numerals 2 are given to the same parts as those in FIG.

In the scroll compressor configured in this way, the constant income gas introduced into the motor chamber 19 passes through the air gap 25 and the vent hole 28, as shown by the solid line arrow in the figure, and then is reversed. Then, it passes through the flow path 26 and is inhaled into the suction chamber 6. The remaining suction gas flows directly into the flow path 26 from the communication hole 29 and is sucked into the suction chamber 6. Therefore, the flow rate of the suction gas that collides with the oil sump 23 is small, and the flow velocity is also small. I can't get caught. Therefore, the oil in the oil reservoir 23 is always maintained, and the bearing is reliably supplied with oil, so that the compressor can continue to operate safely.

In addition, since the amount of suction gas flowing to cool the motor is smaller than that of conventional scroll compressors, the motor temperature will be higher, but the amount of suction gas that will be below the allowable temperature of the motor will be reduced. be able to. In other words, if the diameter 2 of the communication hole 29 is selected appropriately, the air gap will be 25gJ:
The amount of suction gas that cools the motor without passing through the vent holes 28 can be minimized, and the remaining suction gas flows directly into the flow path 26, thereby eliminating temperature rise due to heat generated by the motor. The temperature of the part of the intake gas that is divided into two directions and passed through the motor rises;
2, the amount of heat released to the outside increases 77D, and as a result, the temperature of the suction gas sucked into the suction chamber 6 is low (
Become. Therefore, the specific weight of the intake gas is large (and the weight flow rate of the intake gas sucked per revolution of the crankshaft increases by 7
101-, and the capacity of the compressor increases 71a.

As stated above, according to the present invention, the suction gas can carry away the oil in the oil reservoir, TK A high performance compressor can provide excellent constant efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the operating principle of a scroll compressor, FIG. 2 is a sectional view of a conventional scroll compressor, and FIG. 3 is a sectional view showing an embodiment of the present invention. 1 is the city scroll, 2 is the swinging scroll, and 5 is the compression chamber. 6 is a suction chamber, 10 is a frame, 13a is a motor stator, 13b) is an emator rotor, 14 is a crankshaft, 19 is a motor chamber, 23 is an oil reservoir, 26 is a flow path, and 29 is a communication hole. Kuzu 1 7 y If / Sendo - Genka Toto and Gin λ: h5゜ Pre 1
Kasumiko 2 @ ? 3M

Claims (1)

[Claims] A fixed scroll and an oscillating scroll, each having a volute Y, and a compression chamber formed between both volutes by combining these volutes with each other; By compressing the fluid χ with the Oldham joint and the crankshaft, the frame supporting this crankshaft and the above frame being fixed? The motor is driven by the crankshaft, and the shell accommodates all the components, and the suction gas introduced into the motor chamber formed between the frame 1 and the motor is driven by the motor. In a scroll compressor having a structure in which the air is sucked into the compression chamber by passing through a passage such as an air gap, and then passing through a flow path χ formed between the outer circumference of the motor and the outer circumference of the frame and the shell, the motor A scroll compressor characterized in that a communication hole connecting the chamber and the above-mentioned flow path is a roof tile.