JPH032717Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement of an oil rotary vacuum pump.

[Conventional technology]

2 and 3 are cross-sectional views showing the conventional device disclosed in JISB8326. In the figures, 1 is a box, 2 is an air inlet port that is oil-tightly connected to this box 1, and 3 is a box 1. 4 is a front cover that is oil-tightly connected to the box 1; 5 is a cylindrical body that is connected to the inner wall 4a of the front cover 4; 6 is an inner wall 6a of the cylindrical body 5; The combined rear cover constitutes a cylinder 50 with the front cover 4 and the cylindrical body 5. 7 and 8 are cylinders 50
9 is an exhaust valve arranged on the opening side of the exhaust port 8; 10 is a cylinder 50;
A rotating shaft 11 is eccentric to the inner diameter axis of the rotating shaft 1 and supported by the front cover 4 and the rear cover 6.
A rotor 11 is connected to the rotary shaft 10 and rotates eccentrically within the cylinder 50, and has a pair of vanes supported so as to be freely displaceable in the radial direction. The inner wall 4a of the cover 4 and the inner wall 6a of the rear cover 6 are slid. 13
is a spring that urges the pair of vanes 12 in the direction of separation; 14 is a pulley that drives the rotating shaft 10;
15 is oil sealed in the cylinder 50.

In the structure configured as described above, when the pulley 14 is rotated, the rotor 11 is rotated, and a volume change occurs in the cylinder 50 by the vane 12, which sucks air from the intake port 7 and draws air from the exhaust port 8. is discharged from. Therefore, the air inside the device that is evacuated is discharged from the intake port 2 that communicates with the intake port 7. Further, the air discharged from the exhaust port 8 passes through the exhaust valve 9, is discharged into the box 1, and is further discharged into the box 1 through the exhaust valve 3.
is discharged out of box 1 via. here,
The cylinder 50 is immersed in oil, and the spaces between the cylinder 50 and the rotor 11, and between the vanes 12 and the cylinder 50 are airtight and lubricated.

[Problem that the invention attempts to solve]

Conventional oil rotary vacuum pumps are constructed as described above, so although the rotor and vanes are lubricated with oil, the end face of the rotor is constantly sliding on the inner wall of the front cover and the inner wall of the rear cover. Therefore, there was a problem that the oil ran out and the sliding surface could be abnormally worn.

This idea was made to solve the above-mentioned problems, and it is possible to obtain an oil rotary vacuum pump that can prevent oil from running out on the inner wall of the cylinder and the end face of the rotor, and can prevent abnormal wear on the sliding surfaces. The purpose is to

[Means for solving problems]

The oil rotary vacuum pump according to this invention includes a box having a first intake port and a first exhaust port and filled with oil; the box is immersed in the oil in the box; a cylinder having a second intake port communicating with the cylinder; and a second exhaust port communicating with the first exhaust port through a space in the box; It has a vane for discharging air from the mouth to the second exhaust port, and is rotatably supported by the cylinder,
The rotor is provided with a rotor whose end face slides on the inner wall of the cylinder, and a recess for an oil sump is formed in the end face of the rotor at an angular position that corrects an imbalance in the center of gravity of the rotor.

[Effect]

The oil rotary vacuum pump according to this invention corrects the unbalance of the center of gravity of the rotor with a recess formed on the end face of the rotor for an oil sump, and the recess prevents oil from running out and vibration of the rotor.

〔Example〕

11b is a circumferential groove for an oil sump machined concentrically on both end faces 11a of the rotor 11, and 11c is a concave part for an oil sump machined to match the circumferential groove 11b on both end faces 11a of the rotor 11. This corresponds to the angular position of the unbalanced center of gravity of the rotor 11, and the unbalanced center of gravity of the rotor 11 has been corrected.

In the structure configured as described above, when the end surface 11a of the rotor 11 slides on the inner wall 4a of the front cover 4 and the inner wall 6a of the rear cover 6, the end surface 11a
Due to the circumferential groove 11b and the recess 11c formed in the end face 11a, the amount of oil required for lubrication can be reliably maintained on the end face 11a, and the end face 11a is reliably lubricated. Moreover,
Since the recess is located at an angular position that corrects the unbalance of the center of gravity of the rotor 11, vibrations during rotation of the rotor 11 are also suppressed. In addition, the concave part is machined with a circumferential groove 1.
1b, the alignment of the cone machining becomes extremely easy.Furthermore, the recess 11c and the circumferential groove 11b communicate with each other, and the circumferential groove 11b is supplied with lubricating oil from the recess 11c. Therefore, good lubricity can be ensured over a long period of time.

[Effect of idea]

As mentioned above, this invention has a first air intake port and a first air intake port.
a second air intake port immersed in the oil within the box and communicating with the first air intake port, the first air outlet and the box; The second part communicated through the inner space.
a cylinder having an exhaust port, and a vane for causing a volume change within the cylinder and discharging air from the second intake port to the second exhaust port, the vane being rotatably supported by the cylinder. , a rotor whose end face slides on the inner wall of the cylinder is provided, and a recess for an oil sump is formed on the end face of the rotor at an angular position that corrects the unbalance of the center of gravity of the rotor, so that the inner wall of the cylinder and the end face of the rotor are This has the effect of preventing the oil from running out and correcting the unbalanced center of gravity of the rotor using a common recess.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the invention, FIG. 2 is a cross-sectional view taken along the - line, FIG. 3 is a cross-sectional view of a conventional device, and FIG. 4 is a cross-sectional view taken along the - line. In the figure, 1 is a box, 2 and 7 are intake ports,
3 and 8 are exhaust ports, 50 is a cylinder, 11 is a rotor, 11a is an end face, 11c is a recess, 12 is a vane, and 4a, 6a are inner walls. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] a box having a first intake port and a first exhaust port and filled with oil; a second intake port immersed in the oil within the box and communicating with the first intake port; a cylinder having a first exhaust port and a second exhaust port communicating with each other through a space in the box; The rotor has a vane for discharging the air to the exhaust port, is rotatably supported by the cylinder, and has an end surface that slides on the inner wall of the cylinder, and has an angular position on the end surface of the rotor to correct an imbalance in the center of gravity of the rotor. An oil rotary vacuum pump characterized in that a recess for an oil sump is formed in the bottom of the pump.