JPS5929785A - Refrigerant compressor - Google Patents

Abstract

PURPOSE:To make it possible to suppress the scatter of oil, by communicating a thin pipe vertically attached to the axial core part of a crank shaft with an oil feed hole and by making a discharge pipe open in the vicinity of this thin pipe to reduce the centrifugal force applied to oil in which the thin pipe is submerged, for reducing variations in the level of oil. CONSTITUTION:By attaching a thin pipe 29 which is thinner than a crankshaft 10, and is communicated with an oil feed hole 11, to the axial core of the crankshaft 10, the peripheral speed of the peripheral part of the thin pipe 8 is made low and as well, the centrifugal force applied to oil to which the thin pipe 28 is submerged may be less so that variations in the level of oil may be reduced and the scatter of oil may be suppressed. With this advantageous effects, the opening of a discharge pipe 25 may be arranged in the vicinity of the rotational center, that is, in the vicinity of the thin pipe 28, so that gas flow shown by the solid line in the drawing tends to flow to the opening of the discharge pipe 25 overcoming the centrifugal force due to the rotation of a rotor 20 after the gas flow passes through an air gap 21 between the rotor 20 and a stator 19, etc. As a result, oil flow shown by the chain line is broken off due to weight differential after passing through the motor, and therefore, the oil is effectively separated. With this arrangement, the rise of oil may be prevented and as well as satisfactory lubrication may be made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an oil supply mechanism and gas passage inside a compressor used in a high-pressure shell-type refrigerant compressor or the like.

Hereinafter, as an example, the present invention was applied to a scroll compressor. Let me explain the case.

Figure 1 (11), (b), (→, (d)) shows the basic components and operation W of a scroll compressor.

In these figures, 1i-J is a fixed scroll, 2 is an oscillating scroll, 3 is a discharge 1'', 4 is a compression chamber, 0-1 is a fixed scroll'', and the second fixed point 50' is a fixed point on the oscillating scroll. The fixed scroll 1 and the oscillating scroll 2 are constituted by four-shaped spirals, and the shape thereof is a combination of six involues or one circular arc, as is conventionally known.

Next, the operation will be explained. Figure 1 (11) bL(c
), (d), the fixed scroll 1 is stationary with respect to space, and the swinging scroll 2 is arbitrarily combined with the fixed scroll 1 as shown in the figure, so that its posture does not change with respect to space. , performs a rotational movement, that is, a rocking motion, as shown in Fig. 1 (
A), (b), (cJ, 0° shown in (d)
, 90°, 180'.

Move like 270°.

As the swinging scroll 2 swings, the fixed scroll l
The crescent-shaped compression chamber 4 formed between the scroll 2 and the oscillating scroll 2 gradually reduces its volume, and the gas taken into the compression chamber 4 is compressed and discharged from the discharge port 3. During this time, the distance o-o' in each of the first figures was kept constant.
Let the interval between the spirals be expressed as t, and the thickness as t. 00'=-! ! −、
It is t. a corresponds to the pitch of the spiral.

The outline of the device known as the scroll compressor W5 machine has been described above.Next, the specific configuration and operation of the scroll compressor will be explained with reference to FIG.

In the figure, 1 is a fixed scroll, 2n is an oscillating scroll, 3 is a discharge port, 4 is a compression chamber, 5e is a suction pipe, 6 is a suction port, 7 is a frame, 8 is a compression section suction chamber, 9 is an Oldham joint, 10 is the crankshaft, 11.12 is the oil supply, 13 is the oil supply groove, 14*15+16.17 is the bearing sliding surface, 18 is the communication port, 19 is the motor stator, 20 is the moke cloak, 21
is an air gap, 22, 23 is a balancer, 24 is a motor chamber, 25 is a discharge pipe, 26 is a shell, and 27 is an oil reservoir.

The oscillating scroll 2 is fitted with a fixed scroll 1, and the oscillating scroll 2 is connected to a crankshaft 10. The crankshaft 10 is fitted into the frame 7 , the frame 7 and the fixed scroll 1 are connected with bolts or the like (not shown), and between the oscillating scroll 2 and the frame 70 there is an Oldham's mechanism for preventing the oscillating scroll 2 from rotating. Joint 9 is located. Further, a motor rotor 2o is connected to the crankshaft 10 by press fitting or the like, and the motor rotor 20 includes a first balancer 22,
The second balun chain 23 is secured by caulking or the like (not shown). The frame 7 and motor rotor 9 are shell 2
6 is press-fitted etc.

Further, a discharge pipe 25 is arranged at the bottom of the shell 26 and opened higher than the oil reservoir 27.

The crank Itζ 1110 is provided with an oil supply hole 11, one end of which is opened into the oil reservoir 27, and the other end of which is passed through an eccentric hole bearing sliding portion 14 connected to the boss portion of the oscillating scroll 2. Further, an oil supply hole 12 is provided branching off from the oil supply hole 11 and opens into an oil supply groove 13 provided in the sliding portion of the crankshaft 10 near the tip of the boss portion of the frame 7. Then, the fitting surface 2 on the opposite side of the bearing sliding part 17 across the oil supply s13.
8 with the crankshaft 10, the bearing sliding part 1
7 and the crankshaft 10.

Next, the operation will be explained. First, when the motor stator 19 is energized, rotational torque is generated in the motor rotor 20, causing the crankshaft 10 to rotate. The oscillating scroll 2 starts to rotate, but is prevented from rotating by the Oldham joint 9, so the fixed scroll 1 and the oscillating scroll 2 compress the gas according to the compression principle shown in FIG. Here, the oscillating scroll 2 performs an eccentric revolution, and its static and dynamic alignment is performed by balancers 22 and 23.

When the compressor is operated in this manner, the working fluid gas is sucked through the suction pipe 5 and enters the suction chamber 8 as shown by the solid line arrow in FIG. After being compressed in the compression chamber 4, the high pressure gas is discharged into the shell 26 through the discharge port 3.

The discharge gas is guided to the motor chamber 24 through the communication port 18, passes through the air gap 21 of the motor, etc., and is discharged to the discharge pipe 25.

At this time, the motor cloak 20 and motor stator 19 are cooled by the discharged gas. In addition, as shown by the dotted line arrow in FIG. The sliding parts 14.15 are lubricated.

From the oil supply hole 12, the oil supply groove 13 passes through the bearing sliding portion 17.
Refuel 18.

The oil used for lubrication passes through 15 bearing sliding parts, lubricates the Oldham joint 9, and is then compressed together with the gas sucked in from the suction pipe 5. The oil is then used to seal the compression gap. After the gas is compressed, the oil discharged from the discharge port 3 together with the discharge gas passes through the communication port 18 and the air gap 21, and then is separated from the discharge gas and returns to the oil reservoir 27. The discharge gas that has passed through the air gap 21 is discharged from a discharge pipe 25 provided at the bottom of the shell 26.

In the high-pressure shell-type hermetic scroll compressor as described above, the crankshaft 10 immersed in the oil sump 27 rotates to agitate the lubricating oil in the oil sump 27 and fluctuate the oil level in the oil sump 270 by centrifugal force. The raised oil surface is stator 1
The discharged gas brings lubricating oil in the form of oil droplets that come into contact with the coil end on the oil sump 27 side of No. 9 and block the gas passage or scatter to the outside of the compressor through the discharge pipe 25. It was easy to cause problems.

The present invention has been made to eliminate the above-mentioned drawbacks, and an example thereof is shown in FIG.
It is a thin tube that is vertically attached to the shaft core and communicates with the oil supply hole 11. Further, the discharge pipe 25 opens near this thin tube 28.

By attaching the thin tube 28, which is thinner than the crankshaft 10, to the shaft center in this way, the circumferential speed at its outer circumference can be made much smaller.
Since the centrifugal force applied to the immersed oil is small, fluctuations in the oil level are small and oil scattering can be suppressed.

Furthermore, due to these effects, the opening of the discharge pipe 25 on the inside of the compressor can be brought closer to the center of rotation near the thin tube 28, so that the gas flow shown by the solid line in the figure is caused by the air gap 21 between the rotor 20 and the stator 190. After passing through the rotor 20
The discharge pipe 25 near the center of rotation resists the centrifugal force due to the rotation of
tries to flow into the opening. As a result, the oil flow shown by the dotted arrow is shaken off by the heavy clearance after passing the motor,
Oil is effectively separated.

FIG. 4 shows another embodiment, in which the discharge gas discharged from the discharge port 3 is placed in an oil sump 27 below the rotor 20 and stator 19.
The oil is discharged through the pipe 29 opened inside the shell 26 which is higher than the oil level of the stator 19 through the air gap 21 etc.
and the frame 70 through a discharge pipe 25 provided in the shell 26 located between the frame 70 and the frame 70 . In this case, oil level fluctuations and splashes are also prevented from carrying oil from the oil reservoir 27 to the outside of the discharge pipe 25 together with gas.

As described above, according to the present invention, the oil contained in the discharged gas is effectively separated inside the compressor, preventing the oil from occurring and providing good lubrication. It has an excellent effect of preventing burn-in accidents.

[Brief explanation of the drawing]

Figures 1 (-), (b), (, ), and (d) are operating principle diagrams showing mutually different operating states of a scroll compressor, and Figure 2 is a longitudinal sectional view showing an example of a conventional scroll compressor; FIG. 3 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. 4 is a longitudinal sectional view showing another embodiment. Note that the same reference numerals in the figures indicate the same or corresponding parts. 1... Fixed scroll, 2... Oscillating scroll, 3
...Discharge port, 4...Compression chamber, 5...Suction piping, 7
... Frame, 8... Compression section suction chamber, 9... Oldham joint, 10... Crankshaft, Work 1... Oil supply hole,
18...Communication port, 19...Motor stator, 20...
...Motor rotor, 21...Air gap, 22.2
3... Balancer, 25... Discharge pipe, 26... Shell, 27... Oil reservoir, 28... Thin tube, 29... Piping. Agent Shin Kuzuno - (1 person) , wa) (C) t2 Zuga 3 Zuko 4v! J. Procedural amendment band (spontaneous) Commissioner of the Japan Patent Office 1, Indication of case Patent application No. 141425/1982 2
, Title of the invention Refrigerant compressor 3, Person making the amendment (Relationship with 'I- Patent applicant's address Address: 2-2-3 Marunouchi, Nanaida-ku, Tokyo)
) Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent address Marunouchi 2-chome, Chiyo F11-ku, Tokyo] 2
Numbers 3 and 5, Subject of amendment + 11 Column 6 of detailed explanation of the invention in the specification, Contents of amendment (1) The specification is corrected as follows.

Claims (4)

[Claims] (1) A compression mechanism incorporating an electric motor at the top is installed in a sealed shell, a suction pipe is connected to the compression mechanism suction space through the shell, and a discharge port is opened to the inner space of the shell. The lubricating oil stored in the inner bottom of the shell is pressurized to create a high-pressure space, and the lubricating oil is passed through the oil hole provided in the crankshaft, which is a drive transmission element incorporated in the compression mechanism, to generate each sliding movement. After supplying it to the surface, −
The lubricating oil is leaked into the suction space of the compressor +74 with an appropriate pressure loss in mind, and this lubricating oil is supplied to the compression mechanism together with the suction gas to close the oil seals on the low-pressure side and high-pressure side during compression. After leveling, discharge from the discharge port, and 4' lubricant is lubricated.
In a high-pressure shell hermetic refrigerant compressor in which the rf temperature is stored at the bottom of the upper shell and the discharge gas is taken out from the shell and taken out from the discharge pipe, at least the oil storage part side end of the crankshaft is The part that is immersed in the oil storage part is made as thin as the shaft core, and the end of the shaft is opened like an oil hole toward each of the above-mentioned sliding surfaces. A refrigerant compressor. (2) A thin tube was attached vertically to the shaft core at the end of the oil storage section of the crankshaft, and only the thin tube section was immersed in the oil storage section, allowing the first tube to pass through the oil holes 5 and 91 in the crankshaft. A refrigerant compressor according to claim 1, characterized in that: (3) A flow passage is provided which allows the discharged gas discharged from the compression mechanism discharge port to flow from the upper part of the electric motor to the lower part thereof, and leads to a discharge pipe opened near the narrow end of the crankshaft at the bottom of the shell. The refrigerant compressor according to item 1 above. (4) The above compression mechanism discharge 1 is connected to the oil storage at the bottom of the well marked - by υ piping, etc., and the discharged gas from the 700 old part is circulated from the bottom of the motor to the top, and the above motor The refrigerant compressor according to item 1, further comprising a flow path leading to a discharge pipe opened in an upper shell of the refrigerant compressor.