JPS6245095Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a compressor.

For example, a conventional semi-hermetic refrigeration compressor, as shown in the vertical cross-sectional view of FIG. Compressed refrigerant gas is discharged from the discharge port, and each sliding part of this type of compressor is lubricated by splashing oil stored in the crank chamber 5 with a scraper 6. A portion of the oil is discharged from the gap between the piston 4 and the cylinder 7, the pressure equalizing passage 8, and the bearing part 9, and is discharged together with the refrigerant gas.The oil travels around the refrigerant circuit and flows from the suction port 1 to the motor chamber. Returning to 10, a portion of the oil is separated in the motor chamber 10, and the oil collected at the bottom returns to the crank chamber 5 through the check valve 11.

In this case, the check valve 11 needs to be constructed in such a way that it only allows oil to flow from the motor chamber 10 to the crank chamber 5, and prohibits the oil from flowing from the crank chamber 5 to the motor chamber 10. In this case, oil in the crank chamber 5 may flow out into the motor chamber 10 when the refrigeration compressor is stopped due to a valve closing failure.
Once the oil flows from the crank chamber 5 to the motor chamber 10 in this way, a seizing accident occurs due to insufficient oil splashing on each sliding part of the scraper 6 due to the drop in the oil level in the crank chamber 5 at the time of startup. Furthermore, even if a seizure does not occur, there are problems such as the oil level in the sight glass for controlling the crankcase oil level dropping below a predetermined level and requiring oil replenishment.

The present invention was proposed in view of these circumstances, and aims to provide a compressor that maintains the oil level in the crank chamber at a predetermined level and provides smooth lubrication without failure. In a compressor where the crank chamber and motor chamber are located almost horizontally, a communication hole is provided between the bottom of the motor chamber and the lowest allowable oil level position in the crank chamber, and a check valve chamber is provided in the middle of the communication hole. It is characterized by being closed using the bottom cover of the crankcase.

An embodiment of the present invention will be explained with reference to the drawings.
Fig. 2 is a vertical sectional view thereof, Fig. 3 is a partially enlarged view showing the vicinity of the check valve chamber in Fig. 2, Figs. 4 to 6 are partially enlarged views showing modifications of Fig. 3, and Fig. 7. 7 is a plan view showing the valve plate of FIGS. 4 to 6. FIG.

First, in Figures 2 and 3, the same symbols as in Figure 1 indicate the same members as in the same figure, and the motor chamber 1
An opening 12a on the motor chamber 10 side of the communicating passage opened in the partition wall 20 between the crank chamber 5 and the crank chamber 5 is opened at the lowest end of the motor chamber, and an opening 12d on the crank chamber 5 side of the communicating passage is opened in the crank chamber 5. Minimum oil level 13
The hole drilled at the position below the motor chamber side opening 12a expands into a conical shape to become a large diameter hole, and the lower opening is closed by the gasket 21 and the crankcase bottom cover 22. It forms a check valve chamber. A plurality of bolts 23 fix the crankcase bottom cover 22 to the lower end opening of the crank chamber 5 via the gasket 21.

A ball 14 is inserted into the check valve chamber, and a communication hole 12b is formed at its lower part, which communicates with the crank chamber 5 via communication hole 12c. The conical portion of the check valve chamber and the ball 14 are precisely finished and have a valve function, and the communication hole 12b is a small hole which prevents the ball 14 from protruding into the crank chamber 5.

The gap between the large diameter part of the check valve chamber and the ball 14 is such that when the crank chamber 5 pressure is slightly higher than the motor chamber 10 pressure, the ball 14 floats upward due to the resistance of the fluid flowing there; The size is such that oil accumulated in the motor chamber 10 can flow sufficiently into the crank chamber 5.

In such a structure, the check valve chamber and the bulb 1
4, when the pressure in the motor chamber 10 is higher than the pressure in the crank chamber 5, the oil accumulated in the motor chamber flows to the crank chamber 5.

However, when the pressure in the crank chamber 5 is higher than the pressure in the motor chamber 10, the ball 14 rises and comes into close contact with the conical portion, so that gas and oil in the crank chamber 5 do not leak into the motor chamber 10. do not have.

Further, while the compressor is stopped, the oil level in the crank chamber does not fall below the communication pipe opening 12d, and the minimum allowable oil level is ensured.

With this structure, the oil level in the crank chamber does not fall below the allowable minimum level during shutdown, preventing metal seizing accidents due to a drop in the oil level at the beginning of startup, and also prevents additional oil replenishment due to a drop in the oil level. This eliminates the need for maintenance, and furthermore, the reduced number of related members also facilitates their processing, resulting in cost reduction.

Note that each of the check valve chambers can have a structure as shown in FIGS. 4 to 6. That is, first, in FIG. 4, 18 is a valve plate (see FIG. 7), and 15 is a stopper, which is press-fitted into the check valve chamber 25.

Next, in FIG. 5, a valve seat 19 is press-fitted into the check valve chamber 25.

Furthermore, in FIG. 6, 26 is a spring that pushes down the valve plate 18, and 24 is a snap ring that serves as a stopper for the valve plate 18.

Even with the check valve chamber having the structure as described above, substantially the same effects as those of the above embodiment can be achieved.

In short, according to the present invention, in a compressor in which the crank chamber housing the compression mechanism and the motor chamber are located almost horizontally, a communicating hole is provided between the bottom of the motor chamber and the lowest allowable oil level position of the crank chamber, By blocking the check valve chamber provided in the middle of the communication hole using the bottom cover of the crankcase, a low-cost compressor that ensures smooth operation is obtained, so this invention is extremely useful industrially. It is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a known semi-hermetic refrigeration compressor, FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention,
Figure 3 is a partially enlarged view showing the check valve in Figure 2;
4-6 are partial vertical sectional views showing modifications of the valve plate shown in FIG. 3, and FIG. 7 is a front view showing the valve plate shown in FIGS. 4-6. 1... Suction port, 2... Motor, 3... Suction passage, 4... Piston, 5... Crank chamber, 6...
Scraper, 7...Cylinder, 8...Pressure equalization pipe, 9
... Bearing part, 10 ... Motor chamber, 12 ... Communication oil passage, 12a ... Motor room side opening, 12b, 12
c...Communication hole, 12d...Crank chamber side opening,
13...Minimum allowable oil level, 14...Ball, 15...Stopper, 18...Valve plate, 19...Valve seat, 20...
Partition wall, 21...Gasket, 22...Crankcase bottom cover, 23...Bolt, 24...Snap spring, 25...Check valve chamber, 26...Spring.

Claims (1)

[Scope of utility model registration request] In a compressor where the crank chamber housing the compression mechanism and the motor chamber are located almost horizontally, a communication hole is provided between the bottom of the motor chamber and the lowest allowable oil level position in the crank chamber, and a communication hole is provided in the middle of the communication hole. A compressor characterized in that a check valve chamber is closed using a bottom cover of a crankcase.