JPS6248046B2 - - Google Patents

Abstract

PURPOSE:To enable to carry out cooling of a main spindle bearing, by feeding lubricating oil reliably to an outside main spindle bearing at the time of discharge of air in a crank chamber and by means of the atmospheric air at the time of suction of air into the crank chamber. CONSTITUTION:When a piston is descended, air and an oil drop in the air are entered into an inner air chamber 14 through a gap of an inner main spindle bearing 10, which are entered further into an oil seal chamber 18 through a gap of an outer main spindle bearing 11 and then discharged outside by passing through the oil seal chamber 18, a ventilating hole 16, an external air chamber 15 and an air breather hole 19. In this instance, lubricating oil is fed by adhering the oil drop on both main spindle bearings. When the piston is ascended, cool outside air is sucked into a crank chamber in the reverse order of the above. In this case, both the main spindle bearings 10 and 11, a crankshaft 8, a cylinder and the piston are cooled through the cool atmospheric air.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a blazer device for a machine equipped with a crank mechanism, such as a compressor.

(Prior Art) Conventionally, in a machine equipped with a crank device, such as a compressor, as shown in FIGS. 1 and 2, air in a crank chamber 2 repeatedly expands and contracts as a piston 1 moves up and down. , and piston 1
Compressed air leaks from between the piston ring 4 and the cylinder 5 fitted into the cylinder 5, increasing the air pressure inside the crank chamber 2. A blazer device 6 is provided on the outside of the crank chamber 2 to allow the inside of the crank chamber 2 to breathe.

The Blazer device 6 is equipped with a lubricating oil separation device and a valve so that when the air in the crank chamber 2 exits, lubricating oil in the form of oil droplets in the crank chamber 2 is not taken out. However, this valve must be linked to the up and down movement of the piston,
If the amount of released air is large, malfunction may occur. Furthermore, since the Blazer device 6 is directly connected to the crank chamber 2, atomized lubricating oil may be released to the outside, causing loss of lubricating oil and damaging equipment and locations around the compressor. There are drawbacks such as contamination, and the fact that the blazer device 6 protrudes outward, which goes against the trend of miniaturization of the machine.

Furthermore, the splash plate 9 provided at the lower end of the connecting rod 7 splashes the lubricating oil stored at the bottom of the crank chamber 2 onto the connecting rod 7, the bearings of the crankshaft 8, the cylinder 5, etc. Although it is designed to improve lubrication, the outer main bearing 1 that is far from the location of the splash plate 9
1 etc., there is a defect that inevitably leads to insufficient supply of lubricating oil, resulting in accidents such as seizure of the main bearing 11.

Furthermore, in Japanese Patent Publication No. 55-1468, a gear transmission with an automatic air bleed device was proposed in which an air bleed valve was attached to the upper side of the casing, and the air bleed valve was opened and closed in conjunction with a rotational transmission mechanism in the casing. are doing.

In this proposal, the air bleed valve automatically opens and closes during operation to appropriately discharge the air inside the casing, and when it stops, the air bleed valve automatically closes to ensure that moisture, dust, etc. are prevented from entering the casing. As stated that it is effective, it is only concerned with evacuation of the air inside the casing, and no consideration has been given to the intake of air.
As mentioned above, it cannot be used in a device in which the air in the crank chamber 2 repeatedly expands and contracts. Furthermore, since the air vent valve communicates with the inside of the casing, if the internal air contains mist oil droplets, they will be released to the outside, causing a loss of lubricating oil as in the case above, and damaging the surrounding equipment. It has defects such as contaminating the place.
Furthermore, since the air venting device protrudes to the outside, it also has the disadvantage of going against the trend of miniaturization of machines.

(Problems to be Solved by the Invention) The present invention has been made by focusing on such conventional problems. The expansion and contraction of the air in the crank chamber is used to create a breathing effect through natural circulation, and when the air is released, lubricating oil is reliably supplied to the outer main bearing and the lubricating oil in the air is sufficiently separated. The purpose of this invention is to solve the above-mentioned problems by creating a structure in which the main bearing, etc. can be cooled by low-temperature outside air when air is taken in.

The present invention provides a main bearing box with main bearings on both sides that support the crankshaft at predetermined intervals, and a partition wall surrounding the crankshaft to form an internal air chamber containing both bearings, and a space located on the outer periphery of the main bearing box. an oil seal chamber that is separated from an external air chamber equipped with an oil passage hole and an oil return hole, and is formed by the external air chamber and the oil seal case by a ventilation hole bored in the outer side wall plate of the main bearing box; The blazer device is characterized in that the air chamber is communicated with the outside through a breathing hole provided in the upper part of the outer stile, thereby allowing the air in the crank chamber to breathe. .

(Function) When the air pressure in the crank chamber increases, the air in the crank chamber and oil droplets scattered in the air enter the internal air chamber through the gap between the inner main bearings, and then from the inner air chamber to the outside. The oil enters the oil seal chamber through the gap in the main bearing, and is then discharged to the outside through the oil seal chamber, ventilation hole, external air chamber, and breather hole, where the air pressure decreases. In this case, when the air and oil droplets pass through the gap between the two main bearings, the oil droplets adhere to both the bearings and supply lubricating oil, and at the same time, a considerable amount of the oil droplets in the air are removed. Furthermore, when air enters the oil seal chamber through the gap in the main bearing, it collides with the oil seal case while being blown away by centrifugal force, causing most of the remaining oil droplets to be separated, and then to the small volume oil seal. By entering the large-volume external air chamber from the chamber through the ventilation hole, the air flow velocity is reduced and the direction is changed, further separating oil droplets, so that the air exiting from the breather hole contains almost no oil. It becomes a state that does not contain.

When the pressure inside the crank chamber is reduced, cold air from the outside enters the crank chamber through the opposite path to the one in which the air is released, returning the air pressure to its original level. In this case, the cold air cools both main shaft bearings, the crankshaft, etc., and has the effect of suppressing their temperature rise.

(Example) FIGS. 3 and 4 showing an example of the present invention will be described below. Reference numeral 12 denotes an air chamber in the main bearing box 13, and inner and outer main bearings 1 that support the crankshaft 8 at predetermined intervals around the crankshaft 8.
A partition wall 16 separates the internal air chamber 14 including the internal air chambers 0 and 11 from the external air chamber 15 located on the outer periphery of the internal air chamber 14, and the crankshaft 8 The oil seal chamber 18 and the external air chamber 15 are communicated through six ventilation holes (not shown, but there are three on the opposite side) drilled near a straight line horizontally orthogonal to the axis of the oil seal chamber 18. .

Reference numeral 19 indicates a breather hole provided at a required location on the upper part of the outer frame 20 of the main bearing box 13 in communication with the external air chamber 15, 21 an oil seal case, 22 an oil seal, and 23 an oil seal case. A lubricating oil passage hole 24 is provided in the lower part of the side wall plate 17 so as to communicate with the oil seal chamber 18 and the external air chamber 15. This is a lubricating oil return hole provided in the

When the piston 1 descends and the air pressure in the crank chamber 2 increases, the air in the crank chamber 2 and the lubricating oil droplets scattered in the air flow into the interior through the gap between the inner main bearing 10. It enters the air chamber 14 and then passes from the internal air chamber 14 through the gap between the outer main bearing 11 and into the oil seal chamber 18.
Then, the oil seal chamber 18-vent hole 16
- External air chamber 15 - Air passes through the breather hole 19 and is released to the outside, thereby reducing the air pressure in the crank chamber 2.

In this case, when the air and oil droplets pass through the gap between the two main bearings 10 and 11, the oil droplets attach to both the main bearings 10 and 11, supplying lubricating oil, and at the same time, a considerable amount of oil droplets in the air are removed. Ru. Most of the oil droplets are on the crankshaft arm and balance weight part 3.
The air containing remaining oil droplets passes through the gap between the main bearing 11 and enters the oil seal chamber 1.
8, most of the oil droplets are separated as they collide with the oil seal case 21 while being blown away by centrifugal force, and then flow from the oil seal chamber 18 with a small volume to the external air chamber 15 with a large volume through the vent hole 1.
6, the flow rate of the air decreases and the direction is changed, further separating oil droplets, so that the air exiting from the breather hole 19 contains almost no oil droplets. The lubricating oil separated in the oil seal chamber 18 enters the bottom of the external air chamber 15 through the oil passage hole 23 and is combined with the lubricating oil separated in the external air chamber 15 to pass through the oil return hole 24. It is then returned to the crank chamber 2.

Also, when the piston 1 rises and the pressure inside the crank chamber 2 is reduced, the air is released from the air vent hole 19 - the external air chamber 15 - the vent hole 16, contrary to the case where the air is released.
- oil seal chamber 18 - outer main bearing bearing 11 - inner air chamber 14 - inner main bearing bearing 10, and a small amount of air passes through breather hole 19 - outer air chamber 15 - return oil hole 24, Fresh air enters the crank chamber 2, and the air pressure inside the crank chamber 2 increases.

In this case, the cold outside air enters the crank chamber 2 through both main bearings 10 and 11.
By cooling both main bearings 10, 11, crankshaft 8, cylinder 5, piston 1, etc.,
It works to suppress these temperature increases. Furthermore, the air passing through the return oil hole 24 functions to completely return the lubricating oil accumulated at the bottom of the external air chamber 15 to the crank chamber 2.

In the above embodiment, six ventilation holes 16 are bored in the outer side wall plate 17 of the main bearing box 13 in the vicinity of a straight line horizontally orthogonal to the axis of the crankshaft 8. However, the number may be any number from 1 to 5 or more than 6, and depending on the position where the breather hole 19 is provided, it is not necessarily in the vicinity of a straight line horizontally orthogonal to the axis of the crankshaft 8. It's fine even if you don't have it. Furthermore, although a case has been described in which a cantilever crank mechanism is provided with the main bearing box 13, the present invention is not necessarily limited to machines having only this condition.

(Effect of the invention) Since the present invention has the above configuration, it has the following effects.

(1) Since the conventional valve mechanism could be eliminated,
It is possible to downsize machines equipped with a crank mechanism.

(2) Lubricating oil can be reliably supplied to the outer main bearings, which tend to run out of lubricating oil, completely preventing accidents such as seizures.

(3) The air from the crank chamber undergoes processes such as blowing due to centrifugal force, changing direction, and changing flow speed before being released after completely separating oil droplets, which prevents loss of lubricating oil and prevents loss of lubricating oil from surrounding equipment. Helps prevent contamination of places and places.

(4) Cold outside air is sucked in through the main bearing, which cools the main bearing, suppresses temperature rise, and prevents burnout accidents.

(5) It is easy to work and can be manufactured at low cost, and since the conventional valve mechanism is abolished, it contributes to reducing the cost of the machine.

[Brief explanation of the drawing]

Figures 1 and 2 show a compressor equipped with a conventional cantilever crank mechanism, with Figure 1 being a partially sectional front view, Figure 2 being a partially sectional side view, and Figures 3 and 4 being a partially sectional side view. This shows one embodiment of the present invention, and the third
The figure is a longitudinal section around the cantilever crankshaft, and FIG. 4 is a side view of FIG. 3, with the left side of the center line being a view with the oil seal case removed, and the right side being a sectional view taken along line A-A. 2...Crank chamber, 8...Crankshaft, 10...
... Inner main bearing bearing, 11 ... Outer main bearing bearing, 12 ... Partition wall, 13 ... Main bearing box, 14 ... Internal air chamber, 15 ... External air chamber,
16...Vent hole, 17...Side wall plate, 18...Oil seal chamber, 19...Breath hole, 20...Outer stile,
21...Oil seal case, 23...Oil hole,
24...Return oil hole.

Claims (1)

[Claims] 1. The main bearing box, which is equipped with main bearings on both sides that support the crankshaft at predetermined intervals, is divided into an internal air chamber containing both bearings by a partition wall surrounding the crankshaft. The main bearing box is separated from an external air chamber equipped with an oil passage hole and an oil return hole located on the outer periphery, and is further formed by a ventilation hole bored in the outer side wall plate of the main bearing box and formed by the external air chamber and the oil seal case. It is characterized by communicating with the oil seal chamber and communicating the external air chamber with the outside through a breathing hole provided in the upper part of the outer sill, thereby allowing the air in the crank chamber to breathe. Blazer device. 2. The Blazer device according to claim 1, wherein an oil passage hole is provided in the lower part of the outer side wall plate of the main bearing box, and an oil return hole is provided in the lower part of the main bearing box.