JPH02149787A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent mixing of lubricating oil and refrigerant gas by arranging the outlet of a passage for returning the lubricating oil passing through a compression mechanism for lubrication to the bottom of a casing on the position to face the upper part of the coil end of a stator in a motor part. CONSTITUTION:As the outlet part 18 of a return oil passage 17 is formed to face the upper part of the coil end 20 of a stator 8, discharged lubricating oil does not pass by the outside of the stator constituting a motor mechanism part M as a passage of refrigerant, but flows down along the stator 8 from the coil end 20 of the stator 8, and returns to an oil sump 13. As the result, the passage of refrigerant through which the refrigerant gas sucked from a suction part 9 flows to a compression mechanism part C, and the passage of lubricating oil through which discharged lubricating oil from the return oil passage 17 flows to the oil sump 13, are divided with the stator 8. Thus, mixing by contact of lubricating oil with refrigerant gas can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a scroll compressor, and in particular, the present invention relates to a scroll compressor, in particular, the oil is transferred upward from a sump at the bottom of the casing along the main shaft to supply oil to the pressure a mechanism. This invention relates to a scroll compressor with an improved lubricating oil supply path that returns to the bottom of the casing.

(Prior Art) Generally, a scroll type compressor used for a compressor such as a refrigeration cycle is known to have a configuration shown in FIG. 2.

As shown in the figure, this scroll-type pressure f1 machine is provided with a frame C that pivotally supports a main shaft in a sealed gauge a, and a fixed scroll d and an orbiting scroll e that form the side part of the compressor are mounted on the upper part of this frame C. But these scrolls d,
It is provided so as to engage the spiral wraps of e. As a result, a plurality of crescent-shaped compression spaces are formed by the spiral wraps within the compression chamber closed by the orbiting scroll e and the fixed scroll d. The orbiting scroll e revolves around the fixed scroll d while maintaining a constant face center distance via the crank part f due to the rotation of the main shaft S.

At this time, the rotation of the orbiting scroll e is regulated by an Oldham ring (not shown).

On the other hand, an electric mechanism for rotating the main spindle is provided at the lower part of the frame C. This electric mechanism section is formed of a rotor g connected to the main shaft and a stator h housed in a frame C to surround the rotor g with a certain gap, and the electric motor It has the following functions. That is, by passing current through the stator h, the rotor g is rotated, and the main shaft connected to the rotor g is rotated, and via the crank part f, the orbiting scroll e forming the lateral part of the compression a is connected to the fixed scroll. It is designed to rotate relative to d. As a result, a plurality of crescent-shaped compressed spaces formed by the spiral wrap between the orbiting scroll e and the fixed scroll d are
The spiral will contract from the outside towards the center.

By the way, the cold gas sucked into the sealed gash a from the suction port I provided in the sealed case ac' enters the compressed space outside the spiral among the plurality of crescent-shaped compressed spaces, and flows into the orbiting scroll. Due to the rotational movement of e, the refrigerant gas is compressed toward the center of the vortex, and is discharged as a high-temperature, high-pressure refrigerant gas from a discharge port j provided at the center of the fixed scroll d.

Further, the balancers p and q provided at the upper and lower parts of the rotor g are provided in order to cancel the unbalance that occurs when the orbiting scroll e rotates, and the mounting method of the lower balancer q is a balancer caulking method. Methods such as the aluminum end ring integral formation method and the rotor press-fit method are known.

In addition, in this conventional scroll compressor, the sliding parts of the main shaft b, the crank part f, and the back surface of the orbiting scroll e are lubricated to prevent them from seizing and to make sliding smooth. Oil is now supplied. That is, the lubricating oil in the oil reservoir k at the bottom of the casing passes through the oil supply passage J inside the main shaft by an oil supply mechanism (not shown) provided in the main shaft, and lubricates the crank part f, which receives the thrust load of the orbiting scroll e. After oil flows into the oil supply passage n in the thrust receiver 1n provided in the frame C and oils the thrust sliding part on the back surface of the orbiting scroll e, the oil flows into the oil return passage l? 80 and return to the oil sump k at the bottom of the casing. In this conventional scroll type compressor, the lubricating oil that has passed through the oil return passage O passes through the outside of the stator h, which serves as a suction gas passage through which cold gas is sucked into the compression mechanism, to an oil sump at the bottom of the casing. It was a side road leading back to K.

(Problem to be solved by the invention) However, in the conventional scroll compressor,
There were the following problems.

First, a lubricating oil supply passage is provided in the frame C to supply lubricating oil to the sliding parts of the main shaft b, the crank part f, and the back surface of the orbiting scroll e. The structure was such that the refrigerant gas returns to the oil sump k at the bottom of the casing through the oil return passage #10, passing through the outside of the stator h which becomes the suction gas passage through which the refrigerant gas is sucked into the compression mechanism, and returning to the oil sump k at the bottom of the casing. There was a problem in that the lubricating oil came into contact with and mixed with the refrigerant gas sucked into the refrigerant gas.

Next, when a current is applied to the stator h in order to rotate the rotor, the current flows through the coils forming the stator 11, so this coil generates heat, causing the entire stator to generate heat. In the structure of a conventional scroll compressor,
The method for cooling the stator l] was performed only by the flow of refrigerant gas sucked in from the suction port i provided in the hermetic casing a. However, the cooling effect of cooling the stator h only by the flow of cold tofu gas was not sufficient.

The present invention was devised to effectively solve these problems, and its purpose is to improve the lubricating oil supply path and reduce the mixing of the lubricating oil with the suction refrigerant gas flowing toward the side of the compressor. The present invention provides a scroll compressor that can also cool the stator with the lJ1 oil.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides a scroll compressor. A support frame is provided so as to cross within the casing, the main shaft is pivotally supported on this support frame, an electric part is formed below it, and a pressure aIfi part including an orbiting scroll driven by the main shaft is formed above it. In addition, an outlet of an oil return passage for returning lubricating oil pumped up from the lower end of the main shaft and passed through the compression mechanism to the inner bottom of the casing is provided in the support frame of the stator of the electric part. It is constructed by being formed so as to face the upper part of the coil end.

(Function) When the scroll compressor with the above configuration is operated, an oil return passage is formed in the support frame, and the outlet of the passage is opened so as to face the upper part of the coil end of the stator of the electric part. The lubricating oil is pumped up from the oil reservoir at the bottom of the casing through the main shaft, supplies the pressure-fi mechanism, passes through the oil return passage provided in the frame, and flows into the stator coil of the electric part, which is inside the stator. It flows to the top of the end, cools this stator, and returns to the bottom of the casing. Therefore, the stator, which generates heat due to the current flowing through the stator coil to rotate the rotor connected to the main shaft, is cooled by the lubricating oil. In addition, the lubricating oil is returned from the upper part of the coil end of the stator of the electric part to the bottom of the casing by the outlet part, and flows down along the inside of the stator, so the cold gas rising on the outside of the stator is Mixing of these can be reduced without significant contact.

(Example) An embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, this scroll compressor S is mainly composed of an electric #R bottom part M and a compression mechanism part C, which are respectively provided in a closed case 1. As shown in FIG. A support frame 3 (hereinafter simply referred to as frame) for pivotally supporting the main shaft 2 is provided in the sealed case 1 so as to cross the case. A fixed scroll 4 and an orbiting scroll 5 forming a compression m#1 section C are provided in the upper part of the frame 3. A plurality of crescent-shaped compression spaces are formed within the compression chamber closed by the orbiting scroll 5 and the fixed scroll 4 due to the spiral wrap formed by the fixed scroll 4 and the orbiting scroll 5. . The orbiting scroll 5 revolves around the fixed scroll 4 while maintaining a certain eccentric distance through the crank portion 6 due to the rotation of the main shaft 2. At this time, the rotation of the orbiting scroll 5 is regulated by an Oldham link (not shown). On the other hand, an electric mechanism section M for rotating the main shaft 2 is provided at the lower part of the frame 3. This electric motor lateral part M includes a rotor 7 attached to the main shaft 2 and a stator 8 attached to a support frame 3 to surround the rotor 7 with a certain gap.
It has the function of an electric motor. That is, by passing current through the stator 8, the rotor 7 is rotated, the main shaft 2 connected to the rotor 7 is rotated, and the orbiting scroll 5 forming the compression mechanism section C is fixed via the crank section 6. It is designed to rotate relative to the scroll 4.

As a result, the plurality of crescent-shaped compressed spaces formed by the spiral wraps of the orbiting scroll 5 and the fixed scroll 11 contract from the outside of the spiral toward the center.

By the way, the refrigerant scum sucked into the sealed case 1 from the suction port 9 provided in the sealed case 1 enters the compression space outside the spiral among the plurality of crescent-shaped compression spaces, and enters the compression space of the orbiting scroll 5. The refrigerant gas is compressed toward the center of the spiral by the rotational movement, and is discharged as a high-temperature, high-pressure refrigerant gas from the discharge port 10 provided at the center of the fixed scroll 4 .

Further, the balancer 11' and the balancer 12 provided at the upper part of the rotorf and the lower part of the main shaft are connected to the orbiting scroll 5.
It is attached to counteract the imbalance that occurs when turning. This scroll type pressure iI? The In balancer 12 is not attached to the rotor 7 as in the conventional example, but is attached to the main shaft 2, so it is not attached to the rotor 7 as in the conventional example.
It is not necessary to specify the angle of the rotor equipped with a balancer during press-fitting or baking bath, as was the case when the rotor was installed in 11, and the man-hours for assembling the rotor and management costs can be reduced.

Note that if the shape of the balancer 12 is shaped like a floper fin, the stator coil ends can also be cooled.

In addition, in the scroll type compressor shown in FIG. 1, the sliding parts of the main shaft 2, crank part 6, and back surface of the orbiting scroll 5 are prevented from seizing, as in the conventional scroll type compressor. Lubricating oil is supplied to prevent this and to make sliding smoother. That is, the lubricating oil in the oil reservoir 13 at the bottom of the casing passes through the oil supply passage 14 inside the main shaft 2 by an oil supply pump (not shown) provided on the main shaft, and supplies the crank part 6 that constitutes the compression mechanism part C to the orbiting scroll. The oil flows into the oil supply passage 16 in the thrust receiver 15, which is provided to receive the thrust load of
After lubricating the thrust sliding part on the back of the frame 5, the oil passes through the oil return passage 117 provided in the frame 3. The oil returns to the oil sump 13 at the bottom of the casing.

The feature of this invention is that the outlet portion 18 of the oil return passage 17 provided in the frame 3 is connected to the motor lateral portion M.
The coil end 20 of the stator 8 is provided so as to face the upper part thereof. Therefore, compression 8! The lubricating oil that has passed through the oil return passage &'817 via the elliptical part C does not pass through the outside of the stator 8, which becomes the suction gas passage through which refrigerant gas is sucked into the compression mechanism part C, but through the inside of the stator 8. The structure is such that the oil passes through and returns to the oil sump 13 at the bottom of the casing 1.

As shown in the figure, the upper edge of the outer side of the stator 8 is supported by the frame 3, so that the refrigerant gas sucked from the suction port 9 ascends the outer side of the stator 8 and flows into the compression am section C. It is configured. In particular, a link-shaped support piece 19 is formed at the lower part of the frame 3, and the stator 8 is fixedly supported on this ring-shaped support piece 19 with bolts or the like (not shown). Further, this support piece 19 has a predetermined length and supports the stator 8 with the coil end 20 positioned inside thereof.

The outlet portion 18 of the oil return passage 17 is opened in the support frame 3 , located inside the ring-shaped support piece 19 and facing the coil end 20 of the stator 8 .

The operation of this embodiment having the above configuration will be described.

When this scroll type compressor is operated, the lubricating oil in the oil reservoir 13 at the bottom of the casing is passed through the oil supply passage 14 inside the main shaft 2 by the oil supply pump (not shown) provided on the main shaft 2, and is passed through the lateral part C of the pressure to machine. After lubricating the crank part 6, which flows into the oil supply passage #116 in the thrust receiver 15, and lubricating the thrust sliding part on the back surface of the orbiting scroll 5, the oil return passage 17 provided in the frame 3 is oiled. Pass through,
It will return to the oil sump 13 at the bottom of the casing.

At this time, in this scroll compressor S, the outlet portion 18 of the oil return passage 17 provided in the frame 3 is connected to the coil end 2 of the stator 8 attached to the inside of the frame 3.
Since the oil return passage 1 is formed so as to face the upper part of
The lubricating oil flowing out from the outlet part 18 of 7 does not pass through the outside of the stator 8, which constitutes the motor lateral part M, which is a refrigerant gas passage through which the refrigerant is sucked into the compression mechanism part C.
The oil flows down from the coil end 20 along the stator 8 and returns to the oil sump 13 at the bottom of the casing.

As a result, the refrigerant gas sucked in from the suction port 9 provided in the sealed casing 1 is directed to the refrigerant gas passage toward the compression mechanism section C, and the lubricating oil flowing out from the oil return passage 17 is directed to the oil reservoir 13 at the bottom of the casing. The lubricating oil passage is connected to the stator 8.
It can be divided into outside and inside. Therefore, the oil return passage 1 is connected to the refrigerant gas heading toward the compressor cable section C.
It is possible to prevent the lubricating oils flowing out from the parts 7 from coming into contact with each other and mixing with each other.

Further, the lubricating oil flowing out from the oil return passage 17 flows along the coils of the stator 8, and cools the stator 8, which generates heat due to the current flowing through the coils of the stator 8 to rotate the rotor 7. In addition to cooling the stator 8 with the aforementioned lubricating oil, the stator 8
Similar to the conventional example, the suction port 9 provided in the sealed casing 1
It is also cooled by the flow of refrigerant scum flowing in, and a sufficient cooling effect can be achieved.

[Advantageous Effects of the Invention 1 As explained above, according to the present invention, the following effects are achieved.

(1) Lubricating oil supplied to the compression mechanism and pressure #? Mixing with refrigerant debris heading toward the side of the i-machine can be prevented.

[2] The stator coil can be cooled with the lubricating oil supplied to the pressure m mechanism.

(3) Excellent effects can be achieved with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view showing an embodiment of the present invention, and FIG. 2 is a schematic side sectional view showing a conventional example. In the figure, 1 is a sealed casing, 2 is a main shaft, 3 is a support frame, 4 is a fixed scroll, 5 is an orbiting scroll,
8 is a stator, 17 is an oil return passage, 18 is an outlet of the oil return passage, and 20 is a coil end. Diagram

Claims (1)

[Claims] 1. A support frame is provided across the casing, a main shaft is supported on the support frame, a motorized part is formed below the support frame, and a compression mechanism part including an orbiting scroll driven by the main shaft is formed above the support frame. , and an outlet portion of an oil return passage for returning lubricating oil pumped up from the lower end of the main shaft and passed through the compression mechanism section to the inner bottom of the casing is provided in the support frame to the coil of the stator of the electric section. A scroll type compressor characterized by being formed so as to face the top of the end.