JPH0441986A - scroll compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor used in an air conditioner, a low-temperature refrigeration unit, or the like.

[Conventional technology]

FIG. 3 is a configuration diagram of a conventional scroll compressor disclosed in, for example, Japanese Patent Application Laid-Open No. 63-196488,
In the figure, reference numeral 1 denotes an oscillating scroll having a spiral wrap 1a provided on a base plate 1b, and 2 a fixed scroll having a spiral wrap 2a combined with the spiral wrap 1a provided on a base plate 2b. A swing bearing 1c and a rotation prevention mechanism 3 are provided on the back surface of the swing scroll 10 base plate 1b. 4 is a main shaft directly connected to the swing bearing 1c, 2c is a refrigerant intake port provided in the fixed scroll 2, and 2d is a discharge port. 5 is a frame supporting the swinging scroll l;
Reference numeral 6 denotes an oil supply hole having an opening 7 at the lower end of the main shaft 4, penetrating eccentrically into the main shaft 4, and communicating with each bearing lc, 8.9. 10 is a motor rotor fixed to the main shaft 4, 11
is a motor stator fixed to the frame 12. Reference numeral 13 designates a shell that accommodates components such as the above-mentioned oscillating scroll 11, fixed scroll 2, and motor, and has an oil reservoir 16 at the bottom. Reference numeral 15 designates a suction pipe for refrigerant gas.

In the scroll compressor configured as described above, when the oscillating scroll 1 is caused to oscillate, both the scrolls 1 and 2
As the compression chamber 14 in between moves toward the center of the scroll, its volume decreases, and the refrigerant sucked through the suction port 2C is compressed and discharged from the discharge port 2d. That is, the refrigerant trapped at the outer periphery of the wrap is compressed toward the center. At this time, the refrigerant gas is sucked into the shell 3 through the suction pipe 15, passes through the air gap between the frame 12 and the motor stator 11, the motor rotor 10 and the motor stator 11, cools the motor, and then the fixed scroll 2 It is taken into the compression chamber 14 through the suction port 2C and compressed.

At this time, lubricating oil is sucked from the oil reservoir 16 through the opening 7 by the pump action of the oil supply hole 6 of the main shaft 4, and is supplied to each bearing 1c, 8.9.

FIG. 4 shows a cross-sectional view of a conventional horizontal scroll compressor.

In the figure, the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and since the basic structure and compression principle are the same as in FIG. 3, the explanation will be omitted. In FIG. 4, reference numeral 20 denotes a positive displacement pump that is installed at the end of the main shaft 4 so that the opening 21a of the tube 21 is immersed in the oil reservoir 16.The positive displacement pump 20 pumps the lubricating oil in the oil reservoir 16. Each bearing 1c, 8.9 is supplied with oil through an oil supply hole 22 provided in the main shaft 4. The mechanism assembled as described above includes fixed and swinging scrolls 1.2, motor rotors, and stators 10 and 1.
1 is placed horizontally and the suction port 2C and suction pipe 15 are located above the oil reservoir 16 by press-fitting, shrink-fitting, etc., into the shell 13 and fixing it therein.

[Problem to be solved by the invention]

In the scroll compressor configured as described above, liquid refrigerant flows into the shell 13 at the time of liquid backing, and refrigerant gas trapped in the start-up oil reservoir 16 after a long-term stop causes a forming phenomenon, which causes the refrigerant gas to flow into the compression chamber 14 along with the oil. If oil is sucked into the compressor and discharged directly to the outside of the compressor, the oil is often depleted instantly.

Therefore, a partition plate 17 is provided above the liquid level of the oil reservoir 10 to prevent oil from being taken out during forming.

However, during liquid backup, the liquid refrigerant falls into the oil sump 16 and dilutes the oil, causing damage to the bearings due to a decrease in oil viscosity. However, due to the structure of the horizontal type, a partition plate was installed above the pond surface to prevent oil from forming due to the structure of the horizontal type. It was a good idea to provide the plate 17. Also, in the case of the horizontal type, there is 16 more oil pools compared to the vertical type.
Since the distance between the inlet port 2c and the inlet port 2c is close, oil is easily taken out during forming, and oil depletion is likely to occur. Furthermore, since the refrigerant gas is sucked into the compression chamber 14 after the motor has been cooled, there is a problem in that the performance of the compressor deteriorates due to heating loss due to an increase in the temperature of the sucked refrigerant.

This invention was made to solve the above-mentioned problems, and it prevents the motor from heating the suction refrigerant gas.
It is an object of the present invention to provide a scroll compressor which prevents a decrease in shaft rotatability due to a decrease in oil viscosity due to liquid refrigerant during liquid back-up or slumber startup.

[Means to solve the problem]

The scroll compressor according to claim 1 of the present invention includes a fixed scroll and an oscillating scroll that form a compression chamber between both volute wraps by combining the volute wraps with each other, and a oscillating scroll that revolves around the oscillating scroll. a main shaft that provides motion and compresses the fluid sucked into the compression chamber; and a rotation prevention device;
A frame having a main bearing that rotatably supports the main shaft, a motor installed below the frame to rotationally drive the main shaft, and an oil reservoir at the bottom with the fixed scroll and the oscillating scroll mounted above the motor. A shell is placed at the bottom and houses the lower end of the main shaft so as to be immersed in the oil reservoir, a suction pipe opens into this shell, and an oil hole is provided in the main shaft that opens at the lower end of the main shaft. In the scroll compressor that supplies lubricating oil in the oil reservoir to the main bearing through an opening at the lower end of the main shaft, the frame is provided with a recess that opens toward the motor, and the suction pipe is opened in the recess, The present invention is characterized in that a shielding plate is provided on the frame so as to communicate the recess and the fixed scroll suction side and cover the opening of the recess from the motor side.

Further, the scroll compressor according to claim 2 of the present invention includes a fixed scroll and an oscillating scroll that form a compression chamber between both the volute wraps by combining the volute wraps with each other, and a scroll compressor that revolves around the oscillating scroll. A main shaft that provides motion and compresses fluid drawn into the compression chamber, a rotation prevention device, a frame having a main bearing that rotatably supports the main shaft, a motor that rotationally drives the main shaft, and an oil reservoir at the bottom. It has a shell that accommodates the fixed scroll, the oscillating scroll, and the motor, and a suction tube connected to the end of the main shaft that is immersed in the oil sump, and draws the lubricating oil in the oil sump through the oil hole in the main shaft. In a horizontal scroll compressor that has a positive displacement pump that supplies the bearing part and a suction pipe that opens into the shell above the oil reservoir, the frame is provided with a recess that opens toward the motor, and the suction pipe is installed in the recess. The present invention is characterized in that the pipe is opened, the recess is communicated with the fixed scroll suction side, and a shielding plate is provided on the frame so as to cover the opening of the recess from the motor side.

[For production]

In the scroll compressor of this invention, the recess provided in the frame communicating with the fixed scroll suction side is covered with a shielding plate, so heating of the refrigerant by the motor can be prevented.
Further, during liquid backup, the shielding plate prevents the liquid refrigerant from falling from the motor chamber side into the oil reservoir, and as a result, the reliability of the bearing is not impaired due to a decrease in the viscosity of the oil.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of a scroll compressor according to the present invention, and in the figure, the same parts as in FIG. 18 is a motor rotor 10 and a motor stator 11
The suction port 2c of the fixed scroll 2 and the suction pipe 15 are communicated with each other through a recess provided in the frame 5 so as to open to the side. Reference numeral 19 denotes a shielding plate that covers the recess 18 and partitions the suction port 2c from the motor side, and is fixed to the frame 5.

With this invention configured as described above, the refrigerant flowing into the shell 13 from the suction pipe 15 is blocked by the shielding plate 19 and does not flow to the motor side, but directly from the recess 18 to the suction provided in the fixed scroll 2. It is sucked into the mouth 2c and compressed by the scrolling action. Therefore, the refrigerant gas is not heated by the heat generated by the motor, and therefore heating loss can be reduced, resulting in a highly efficient compressor. Further, even if the liquid refrigerant enters the shell 13, it flows through the suction pipe 15 directly to the suction port 2c and the compression chamber 14, so that a decrease in viscosity due to oil dilution can be prevented, and the reliability of the bearing can be ensured.

Furthermore, by providing the shield Fi 19, the compression mechanism section, the motor section, and the oil sump 16 can be separated, so that the internal pressure of the motor below the shield plate 19 is less likely to drop when starting in a sleep state, and therefore, forming can be suppressed. With,
Even if forming is performed, the oil will not enter the suction port 2c because it is blocked by the shielding plate 19, and oil can be prevented from being taken out of the compressor.

FIG. 2 is a block diagram of a horizontal scroll compressor according to the present invention. In the figure, the same parts as those in FIG. Reference numeral 18 denotes a recess provided in the frame 5 so as to open toward the motor rotor 10 and motor stator 11, and communicates the suction port 2c of the fixed scroll 2 with the suction pipe 15.

19 is the recess 1 that separates the suction port 2c from the motor side.
It is fixed to the frame 5 with a shielding plate covering the frame 8.

By configuring as described above, it is possible to reduce heating loss, prevent viscosity reduction due to oil dilution during liquid backing, prevent oil from being carried out during forming, and suppress forming itself, as in the above embodiment. With the above configuration, it is possible to provide a shielding plate for preventing forming in a horizontally placed scroll with a simple and compact structure.

〔Effect of the invention〕

As explained above, according to the present invention, the frame is provided with a recess that opens on the motor side, the suction pipe is opened in the recess, the recess is communicated with the fixed scroll suction side, and the opening of the recess is connected to the motor side. By providing a shielding plate on the frame to cover the air, the structure is simple and compact, and prevents heating of the refrigerant sucked by the motor.
In addition, during liquid backup, the liquid refrigerant does not flow into the oil reservoir and reduce the oil viscosity, resulting in a scroll compressor with high efficiency and reliability.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a scroll compressor according to one embodiment of the present invention, Fig. 2 is a block diagram of a horizontal scroll compressor according to another embodiment, and Figs. It is a block diagram of each stationary scroll compressor. ■...Swinging scroll, 2...Fixed scroll, 2
c... Suction port, 3 river anti-rotation device, 4... Main shaft, 5
... Frame, 6... Oil hole, 10... Motor rotor, 11... Motor stator, 13... Shell, 1
4... Compressor, 15... Suction pipe, 16... Oil reservoir, 18... Recess, 19... Shielding plate, 20... Positive displacement pump, 21... Suction tube. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 3 (voluntary)

Claims (2)

[Claims] (1) By combining the spiral wraps with each other, a fixed scroll and an oscillating scroll form a compression chamber between the two volute wraps, and the oscillating scroll is given orbital motion to compress the fluid sucked into the compression chamber. A frame having a main shaft and an anti-rotation device, a main bearing rotatably supporting the main shaft, a motor provided below the frame to rotationally drive the main shaft, an oil reservoir at the bottom, and a fixed scroll and an oscillating mechanism. A shell that houses the scroll in the upper part and the motor in the lower part so that the lower end of the main shaft is immersed in an oil reservoir, a suction pipe that opens in this shell, and an oil hole in the main shaft that opens at the lower end of the main shaft. In the scroll compressor, the lubricating oil in the oil reservoir is supplied to the main bearing part through the opening at the lower end of the main shaft by the rotation of the main shaft. A scroll compressor characterized in that the suction pipe is opened, the recess is communicated with the fixed scroll suction side, and a shielding plate is provided on the frame so as to cover the opening of the recess from the motor side. (2) By combining the spiral wraps with each other, a fixed scroll and an oscillating scroll form a compression chamber between the two volute wraps, and the oscillating scroll is given orbital motion to compress the fluid sucked into the compression chamber. A frame having a main shaft and an anti-rotation device, a main bearing that rotatably supports the main shaft, a motor that rotationally drives the main shaft, and an oil reservoir at the bottom to accommodate the fixed scroll, the oscillating scroll, and the motor. a positive displacement pump that is connected to the end of the main shaft and has a suction tube immersed in the oil sump, and supplies lubricating oil in the oil sump to the main bearing through an oil hole in the main shaft; In a horizontal scroll compressor having a suction pipe that opens into the shell above, the frame is provided with a recess that opens toward the motor, the suction pipe is opened in the recess, and the recess and the fixed scroll suction side communicate with each other. A scroll compressor, characterized in that a shielding plate is provided on the frame so as to cover the opening of the recess from the motor side.