JPH07197893A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent suction of oil through an oil discharge hole in a compression chamber in a state that the oil is mixed in refrigerant gas by a method wherein the oil discharge hole is formed outside an outsidemost diameter during rotational movement of a balance weight and a cover is arranged between the oil discharge hole and the balance weight. CONSTITUTION:A scroll type compressor comprises an oscillating scroll 2 and a fixed scroll 1 and refrigerant gas guided through a suction pipe 9 to a compression chamber is delivered as high temperature high pressure gas. In this case, an oil discharge hole 14 communicated with a frame 3 through a communication hole 15 is opened outside the outsidemost diameter of rotational movement of a balance weight 8. Further, a cover 16 is located such a manner that the surroundings of rotational movement of the balance weight 8 protruded upward from the coil end 7a of a stator 7 are surrounded with a portion having diameter smaller than the outside diameter of the coil end 7a. This constitution suppresses a revolution flow of refrigerant gas, generated through rotation of the balance weight 8, only to the side of the cover 16 and reduces the magnitude of a revolution flow of refrigerant gas outside the coil end 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used for refrigeration and air conditioning.

[0002]

2. Description of the Related Art FIG. 9 is a sectional view showing a conventional scroll type compressor disclosed in, for example, Japanese Patent Laid-Open No. 63-80088.
In the figure, 1 is a fixed scroll, 2 is an orbiting scroll, 3 is a frame, and 3a is a boss portion of the frame. Four
Is a main shaft, 5 is a rotor fitted onto the main shaft 4 by shrink fitting, 6 is a closed container, and 7 is a stator fitted by shrink fitting onto the closed container 6,
The rotor 5 and the stator 7 constitute an electric motor.
Reference numeral 7a is a coil end of the stator, and 8 is a balance weight that is caulked on the upper portion of the rotor 5 and projects above the stator 7. Reference numeral 9 is an intake pipe, and 10 is an intake gas passage, which communicates with a compression chamber formed by the fixed scroll 1 and the orbiting scroll 2. Reference numeral 11 denotes a baffle (baffle plate), which is welded to the inside of the closed container 6 by a vertical projecting edge portion that is intermittently arranged in the circumferential direction and communicates with the suction passage 10 side and the mounting space of the stator 7. have. 12 is a closed container 6
Is a sump at the bottom of the rotor, and 13 is a second balance weight caulked at the bottom of the rotor 5.

FIG. 10 is a sectional view near the frame boss portion 3a of the conventional scroll compressor shown in Japanese Patent Laid-Open No. 63-80088. In the figure, 14 is an oil drain hole.

Next, the operation will be described. When electric power is supplied to the stator 7, the rotor 5 generates torque and rotates together with the main shaft 4, causing the oscillating scroll 2 to eccentrically oscillate,
By gradually reducing the volume of the compression chamber formed by combining the fixed scroll 1 and the orbiting scroll 2, the low-temperature low-pressure suction introduced from the suction pipe 9 to the compression chamber via the suction gas passage 10 is obtained. The refrigerant gas is discharged as a high temperature and high pressure gas. With respect to the centrifugal force generated from the eccentric oscillating motion of the oscillating scroll 2, the balance weight 8 and the second balance weight 13 perform balancing in opposition to the centrifugal force to ensure quiet operation of the entire rotary system. I guarantee.

The lubricating oil filled in the oil sump 12 is pumped up into the main shaft 4 by the centrifugal pump action, lubricates each bearing portion, and then is discharged from the oil discharge hole 14, and the clearance between the stator 7 and the rotor 5 and It is returned to the oil sump 12 through a notch portion of the stator 7 which is not protected. Further, the oil mixed in the suction refrigerant gas coming from the suction pipe 9 collides with the baffle 11 and is discharged to the oil sump 12 from the opening communicating with the stator 7 mounting space side.

[0006]

The conventional scroll type compressor is constructed as described above. The balance weight projects upward from the coil end of the stator, and the projecting portion of the balance weight covers the frame boss portion and Since the oil that comes out of the oil hole directly hits the protruding part of the balance weight,
In the case of a variable speed compression crosspiece, most of the oil discharged from the oil discharge hole is blown out toward the outside of the stator coil end by the balance weight during high speed rotation. The oil discharged from the opening that communicates with the stator installation space of the baffle and mist enters the swirling flow of the suction refrigerant gas generated by the rotation of the rotor in the form of mist, and is almost dissolved in the suction refrigerant gas. It is sucked into the compression chamber through the suction gas passage from the bottom of the baffle together with the refrigerant gas, and the amount of oil rises, eventually the lubricating oil in the oil sump disappears, and each bearing part seizes, causing operation failure. There was a problem that

The present invention has been made to solve the above-mentioned problems, and the swirl flow of the suction refrigerant gas outside the coil end of the stator can be minimized, and the oil is the suction refrigerant. An object of the present invention is to obtain a highly reliable scroll compressor that can prevent the state of being melted into gas, suppress oil rising even at high speed operation, and prevent seizure of each bearing part. .

[0008]

DISCLOSURE OF THE INVENTION A scroll type compressor according to the present invention includes a fixed scroll, an orbiting scroll which is combined with the fixed scroll to form a compression chamber, and performs an eccentric oscillating motion, and the oscillating scroll. A balance weight that rotates so as to cancel the centrifugal force generated by the eccentric oscillating motion of the scroll, and an oil discharge hole that opens outside the outermost diameter of the balance weight during the rotational motion and discharges lubricating oil,
The balance weight and the cover located between the oil drain hole are provided.

Further, a fixed scroll, an orbiting scroll which is combined with the fixed scroll to form a compression chamber and performs an eccentric oscillating motion, and a centrifugal force generated by the eccentric oscillating motion of the orbiting scroll are canceled. Between the rotating balance weight and the suction port portion that is opened to the outside of the outermost diameter of the balance weight during rotational movement and that sucks the refrigerant gas into the compression chamber, between the balance weight and the suction port portion. And a cover located therein.

Further, the cover is fixed to a frame which supports a compression element composed of a fixed scroll and an orbiting scroll.

Further, the cover is fixed to a boss portion of a frame which supports a compression element composed of a fixed scroll and an orbiting scroll.

Further, the cover is made of an insulating material.

[0013]

The scroll compressor according to the present invention is provided with the cover located between the balance weight and the oil drain hole, so that the swirling flow of the sucked refrigerant gas does not occur outside the cover, and therefore the scroll hole is discharged from the oil drain hole. The discharged oil may be blown in the circumferential direction by the rotational movement of the balance weight, enter the swirling flow of the suction refrigerant gas in the form of mist, and be sucked into the compression chamber in a state mixed with the suction refrigerant gas. Absent.

Further, since the cover located between the balance weight and the suction port is provided, the swirling flow of the suction refrigerant gas does not occur outside the cover, so that the suction refrigerant gas enters through the suction pipe together with the suction refrigerant gas, and The oil discharged from the lower part of the suction port is blown in the circumferential direction due to the rotational movement of the balance weight, enters the swirling flow of the suction refrigerant gas in the form of mist, and enters the suction refrigerant gas. It will not be sucked into the compression chamber in the state of being mixed in.

[0015]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. The same or corresponding parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. FIG. 1 is a vertical sectional view showing a scroll type compressor according to an embodiment of the present invention. As shown in the figure, the oil drain hole 14 opens outside the outermost diameter of the balance weight 8 during the rotational movement. The oil drain hole 14 communicates with the inside of the frame 3 by a communication hole 15, and one end of the communication hole 15 is closed by a plug 17. There is no part corresponding to the baffle 11 in the conventional example, a part of the frame 3 plays its role, and it is named a frame suction port 3b. Reference numeral 16 is a cover, which is fixed to the lower end surface of the frame 3 with bolts. 2 cover 16
FIG. In the figure, a disk 16a having a hole having a diameter slightly larger than the outer diameter of the frame boss 3a and a cylinder 16b having an inner diameter smaller than the outer diameter of the coil end 7a of the stator.
Although the two parts are joined by TIG welding or the like, they can be integrally formed by sheet metal or the like. 20
Is a bolt hole.

Example 2. FIG. 3 is a sectional view of an essential part showing another mounting method of the cover 16. In the figure, a circumscribing groove 18 is provided in the boss portion 3a of the frame, and a C-shaped retaining ring 19 is fitted in the circumscribing groove 18. The cover 16 is fixed such that the disc 16a is sandwiched between the lower end of the frame 3 and the C-shaped retaining ring 19. In this case, the cover is faster than fixing with bolts.
Can be equipped with 16.

Embodiment 3. FIG. 4 is also a cross-sectional view of an essential part showing another mounting method, in which the cover is configured as in the perspective view shown in FIG. 5, and the end of the small cylinder 16c is arranged along the hole of the disc 16a. The parts are adhered by TIG welding or the like. Alternatively, they may be integrally formed by sheet metal or the like. The small cylinder 16c is sized so that the inner diameter of the small cylinder 16c is tightly fitted to the outer diameter of the boss portion 3a of the frame.
The cover 16 is fixed by pushing the 16 into the boss portion 3a of the frame and tightly fitting the inner diameter of the small cylinder 16c and the outer diameter of the boss portion 3a of the frame. In this case, the cover 16 can be attached to the vehicle in a shorter time than in the embodiment of FIG. 3 which uses the C-shaped retaining ring.

Example 4. FIG. 6 is also a waist cross-sectional view showing another method of attaching the cover 16, in which the boss portion of the frame is shown.
A circular groove 18 is provided at the base of 3a, and the width of the circular groove 18 is a disc 16
a disk that is only slightly larger than the thickness of a.
The hole diameter of 16a is smaller than the outer diameter of the boss portion 3a of the frame,
When the cover 16 has a diameter larger than the outer diameter of the circumferential groove 18 and is pushed into the boss portion 3a of the frame, the elasticity of the disc 16a allows the cover 16 to be inserted until it comes into contact with the lower end surface of the frame 3. The lower end surface serves as a stopper to hook the inner end of the disc 16a to fix the cover 16.

Example 5. FIG. 7 is also similar to FIG. 6, and in this case, the width of the circumferential groove 18 is slightly larger than the width of the small cylinder 16c, and the inner diameter of the small cylinder 16c is larger than the outer diameter of the boss portion 3a of the frame. Is smaller than the outer diameter of the circumferential groove 18, and is inserted by utilizing the elasticity of the cover 16, and the lower end surface of the circumferential groove 18 serves as a stopper to hook the lower end surface of the small cylinder 16c to cover it. The cover 16 is fixed, but in this case, the cover 16 formed integrally can better utilize the elasticity. 6 and 7 or 3, when the distance between the C-shaped retaining ring 19 and the lower end surface of the frame 3 is set to be large with a slight margin with respect to the thickness of the disc 16a, Although some play is generated in the radial direction, no particular force is applied in the axial direction, and no particularly large force is applied in the radial direction, so that such a slight play does not pose a problem.

Next, the operation of the first to fifth embodiments will be described. The cover 16 surrounds the rotational movement of the balance weight 8 protruding above the coil end 7a of the stator with a diameter smaller than the outer diameter of the coil end 7a of the stator. The swirling flow of the suction refrigerant gas can be suppressed only inside the cover 16 and the coil end 7a of the stator, and the swirling flow of the suction refrigerant gas outside the coil end 7a of the stator can be minimized.

The oil mixed into the compression chamber from the inside of the frame 3 and the like enters from the suction pipe 9 together with the suction refrigerant gas through the refrigerant circuit, but the oil collides with the wall of the frame suction port portion 3b, It is discharged from the clearance between the bottom of the frame inlet 3b and the closed container 6.

As described above, the coil end 7a of the stator is
By reducing the swirling flow of the suction refrigerant gas outside of the cylinder as much as possible, the oil discharged from the oil drain hole 14 and the frame suction port portion 3b does not melt into the suction refrigerant gas, and the stator 7 and the rotor 5 are securely connected. It is returned to the oil sump 12 through a clearance and a notch portion of the stator 7 not shown.

Example 6. Although the balance weight 8 is crimped to the rotor 5 in the above embodiment, it may be fixed to the main shaft 4 under the frame 3 by shrink fitting, as shown in FIG. In the above embodiment,
If the material of the cover 16 is a conductor for safety, an insulating distance must be provided between the coil end 7a of the stator and the cover 16, but the cover 16 should be made of an insulating material such as plastic with good heat resistance and refrigerant resistance. If formed by injection molding or the like, it can be brought very close to the coil end 7a of the stator, and the swirling flow of the sucked refrigerant gas outside the coil end 7a of the stator can be more reliably eliminated.

[0024]

As described above, according to the present invention, a fixed scroll, an orbiting scroll which is combined with the fixed scroll to form a compression chamber and performs an eccentric orbiting motion, and an eccentricity of the orbiting scroll. A balance weight that rotates so as to cancel the centrifugal force generated by the rocking motion, an oil discharge hole that opens outside the outermost diameter of the balance weight during rotation motion, and discharges lubricating oil, the balance weight and the above With the cover positioned between the oil drain hole, the swirling flow of the suction refrigerant gas does not occur outside the cover,
Therefore, the oil discharged from the oil drain hole is circumferentially sprung by the rotational movement of the balance weight, enters the swirling flow of the suction refrigerant gas in the form of mist, and enters the compression chamber in the state of being mixed with the suction refrigerant gas. A highly reliable scroll-type compressor that can prevent the oil from being sucked in and thus prevent oil from rising even at high speeds and depleting the lubricating oil in the oil sump and causing seizure of each bearing It is effective.

The balance weight is located outside the outermost diameter of the balance weight during rotation and is located between the balance weight and the suction port, and a suction port for sucking the refrigerant gas into the compression chamber. Since it has a cover, the swirling flow of the suction refrigerant gas does not occur outside the cover, so that it enters from the suction pipe together with the suction refrigerant gas and collides with the wall of the suction port,
The oil discharged from the lower part of the suction port is circumferentially blown by the rotational movement of the balance weight, enters the swirling flow of the suction refrigerant gas in the form of mist, and is mixed with the suction refrigerant gas in the compression chamber. Therefore, a highly reliable scroll compressor that can prevent the oil from rising to a low level even during high-speed operation and prevent the oil in the oil reservoir from running out and seizing each bearing is created. There is an effect to be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a scroll compression rail according to a first embodiment of the present invention.

2 is a perspective view of the cover of FIG. 1. FIG.

FIG. 3 is a sectional view of an essential part showing a method of mounting a cover according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a method of mounting a cover according to a third embodiment of the present invention.

5 is a perspective view of the cover of FIG. 4. FIG.

FIG. 6 is a sectional view of an essential part showing a method for mounting a cover according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view of an essential part showing a method of mounting a cover according to a fifth embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a scroll compressor according to a sixth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a conventional scroll compressor.

10 is a cross-sectional view of the main parts of FIG.

[Explanation of symbols]

 1 Fixed Scroll 2 Oscillating Scroll 3 Frame 4 Spindle 5 Rotor 6 Sealed Container 7 Stator 8 Balance Weight 16 Cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyoshi Wada 3-18-1, Ogashi, Shizuoka City Shizuoka Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. A fixed scroll, an orbiting scroll that is combined with the fixed scroll to form a compression chamber, and performs an eccentric oscillating motion, and a centrifugal force generated by the eccentric oscillating motion of the oscillating scroll is canceled. A rotating balance weight, and an oil discharge hole for discharging lubricating oil, which is opened to the outside of the outermost diameter of the balance weight during rotational movement.
A scroll compressor, comprising: a cover located between the balance weight and the oil drain hole. 2. A fixed scroll, an orbiting scroll that is combined with the fixed scroll to form a compression chamber, and performs an eccentric oscillating motion, and a centrifugal force generated by the eccentric oscillating motion of the oscillating scroll is canceled. Between the rotating balance weight and the suction port portion that is opened to the outside of the outermost diameter of the balance weight during rotational movement and that sucks the refrigerant gas into the compression chamber, between the balance weight and the suction port portion. A scroll compressor, characterized in that it comprises a positioned cover. 3. The scroll compressor according to claim 1, wherein the cover is fixed to a frame that supports a compression element composed of the fixed scroll and the orbiting scroll. 4. The scroll compressor according to claim 1, wherein the cover is fixed to a boss portion of a frame that supports a compression element composed of the fixed scroll and the orbiting scroll. 5. The scroll compressor according to claim 1, wherein the cover is made of an insulating material.