JPH1077981A - Oil-cooled air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an oil tank and facilitate maintenance of a separator formed as a separate body from an oil tank and connected to the discharge opening of the oil tank by connecting the oil tank directly to the discharge opening of a compressor, and connecting the discharge opening of the separator to be connected with the oil tank, provided separately with the oil tank to a heat exchanger. SOLUTION: A guide 7b is fixed to the inside of an oil tank 7 in such a way as to surround a discharge opening of the oil tank 7 with a lead-in pipe 7a directly connected to the discharge opening of a compressor 2. When the compressor 2 is rotated to lead compressed air into the oil tank 7 from the discharge opening through the lead-in pipe 7a, the compressed air becomes swirling flow along the internal wall and guide 7b of the oil tank 7. Oil particle larger in specific gravity than the compressed air is therefore moved to the outside of flow by centrifugal force so as to come in contact with the internal wall of the oil tank 7. The compressed air after primary separation of oil is passed under the guide 7b and then through a pipeline 7c and led to a separator 9 from the discharge opening of the oil tank 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-cooled air compressor.

[0002]

2. Description of the Related Art For example, an oil-cooled air compressor disclosed in Japanese Patent Application Laid-Open No. 4-128991 has been proposed. This oil-cooled air compressor is configured to be introduced into an oil tank through a vibration absorption tube that allows a gas-liquid mixed phase discharged from a compressor body to flow as a bubble flow. With such a configuration, the pressure pulsation of the bubble flow is attenuated,
Noise can be reduced.

[0003]

However, in the above oil-cooled compressor, since the oil tank has a built-in separator for oil separation, not only the oil tank becomes large, but also the maintenance of the separator becomes difficult. It becomes difficult.

[0004] In view of the above-mentioned circumstances, an object of the present invention is to provide an oil-cooled air compressor in which the size of the oil tank is reduced and the maintenance of the separator is facilitated.

[0005]

According to the present invention, there is provided an oil-cooled air compressor which is directly connected to a discharge port of a compressor to separate and store oil contained in compressed air. An oil tank, which is separate from the oil tank, is connected to the outlet of the oil tank by a pipe, and a separator for separating oil contained in the compressed air is provided.The outlet of this separator is connected to the heat exchanger. By doing so, the function of the oil tank is only primary separation and storage of the oil, and the capacity can be reduced. Also,
By placing the separator outside the oil tank,
Maintenance of the separator becomes easy.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of an oil-cooled air compressor according to the present invention, in which (A) is a plan view,
(B) is a front view, (C) is a side view. 2A and 2B show the gantry in FIG. 1, wherein FIG. 2A is a plan view, FIG.
(C) is a side view. FIG. 3 is a front sectional view of the separator in FIG.

In FIG. 1, reference numeral 1 denotes a main body stand, and as shown in FIG. 2, a pair of U-shaped pipes 1c and a pair of elongated holes 1g formed at the lower end of the pipe 1a. , A pair of angle members 1d fixed to the side plate 1b at predetermined intervals, and a compressor base 1a fixed to the top of the pipe 1c.

Reference numeral 2 denotes a compressor which is mounted and fixed on a compressor base 1a. Reference numeral 3 denotes a motor base, which is an angle material 1d.
It is fitted to a bolt 1e standing upright with the screw part up so as to be able to move up and down, and is fixed at a required position by nuts 1f arranged above and below the bolt 1e. At this time, the bolt 1h
To fix the motor base 3 to the side plate 1b. A motor 4 is mounted and fixed on the motor base 3. A belt 4a is stretched between a pulley 4b on the motor 4 side and a pulley 3a on the compressor 2 side. Therefore, the tension of the belt 4a can be adjusted by moving the motor base 3 up and down. Reference numeral 5 denotes a vibration isolating rubber, which includes a machine base 6 and a gantry 1
Sandwiched between

Reference numeral 7 denotes an oil tank whose introduction pipe 7a is directly connected to the discharge port of the compressor 2. Inside the oil tank 7, a guide 7b is fixed so as to surround the discharge port of the oil tank 7. The compressed air introduced from the introduction pipe 7a is supplied to the inner wall of the oil tank 7 and the guide 7
The fluid is guided to the pipe b, flows as a swirling flow through the oil tank 7, and flows out from the discharge port. Numeral 8 denotes an anti-vibration rubber, which is sandwiched between the machine base 6 and the oil tank 7. The height of the oil tank 7 can be adjusted by changing the thickness of the anti-vibration rubber 8.

Reference numeral 9 denotes a separator which is connected to a pipe 7c connected to a discharge port of the oil tank 7. The separator 9 has a configuration as shown in FIG. In the figure, a head section 9a is provided with an annular introduction path 9b connected to a compressed air introduction port, an introduction path 9d formed between the introduction path 9b and the cylindrical section 9c, and an introduction path 9d. It has a check valve 9e and a pressure holding valve 9f that open and close. An external thread 9h is formed on the outer circumference of the mounting portion 9g formed on the outer circumference of the introduction path 9b.

The oil separating section includes a container 9i and the male screw 9h.
A female screw 9j screwed into the container 9i is formed, a reinforcing ring 9k caulked to the opening of the container 9i, an oil separation element 9n having end covers 9l and 9m attached to both ends, and the element 9n is A spring 9o for pressing against the head 9a and a collecting pipe 9p for collecting oil accumulated in the element 9n are provided. A sealing means such as an O-ring is disposed at a place where the leakage of the compressed air is a problem at the joint surface of each component. Then, the compressed air flows as shown by the arrows.

With such a configuration, the motor 4 operates,
When the compressor 2 is rotated, compressed air is introduced from the discharge port of the compressor 2 into the oil tank 7 through the introduction pipe 7a.
At this time, the compressed air flows between the inner wall of the oil tank 7 and the guide 7.
A swirl flows along b. For this reason, the oil particles having a higher specific gravity than the compressed air move to the outside of the flow due to the centrifugal force and are collected by hitting the inner wall of the oil tank 7.

The compressed air from which oil has been primarily separated is supplied to a guide 7
b, and is introduced into the separator 9 from the discharge port of the oil tank 7 through the pipe 7c. Here, when passing through the porous element 9n, fine oil particles are captured by the element 9n, and compressed air containing no oil is supplied to the outlet path 9d.
To a heat exchanger (not shown). The oil O caught by the element 9n is accumulated on the end cover 9m located at the lower end of the element 9n along the element 9n. And it collect | recovers through the collection pipe 9p.

As described above, the separation of the oil tank 7 from the separator 9 facilitates the maintenance of the separator 9. Further, the oil tank 7 may have the functions of primary separation and oil storage of oil, so that the size of the oil tank 7 can be reduced. Further, the downsizing of the oil tank 7 enables integration with the compressor 2, the motor 4, and the like. Further, by forming the main body base 1 with a pipe, the weight of the main body base 1 can be reduced, and the workability of the assembling work can be improved.

FIG. 4 shows a second embodiment of an oil tank in an oil-cooled air compressor according to the present invention, and FIG.
Is a plan view, (B) is a front view, and (C) is a side view. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals. A U-shaped fitting 7d is fixed to the bottom surface of the oil tank 7. On the side surface of the metal fitting 7d, an L-shaped metal fitting 7e for height adjustment having a long hole formed therein is fixed with a bolt 7f.

Accordingly, the bolt 7f is loosened and the metal fitting 7
By moving e in the major axis direction of the long hole, the height of the oil tank 7 can be adjusted. In FIG. 4, B is a compressed air introduction direction, C is a compressed air lead-out direction, and D is a lubricating oil lead-out direction.

FIG. 5 shows a second embodiment of the oil-cooled air compressor according to the present invention, wherein (A) is a plan view, (B) is a front view, and (C) is a side view. 6A and 6B show the gantry in FIG. 5, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. FIG. 7 shows the oil tank in FIG.
Is a plan view, (B) is a front view, and (C) is a side view.

In FIG. 1, the same components as those shown in FIGS. 1, 2 and 4 are denoted by the same reference numerals. As shown in FIG. 6, an L-shaped fitting 1i for fixing the oil tank 7 to the side plate 1b is fixed to the main body base 1. On the other hand, a metal fitting 7h having a long hole 7g is fixed to a lower portion of the oil tank 7, as shown in FIG. The metal fitting 7h is fixed to the metal fitting 1i of the main body base 1 with a bolt 7i.

As described above, the oil tank 7 is
By installing the oil tank 7 without anti-vibration rubber
The transmission of the vibration generated by the above can be prevented.

[0020]

As described above, according to the present invention, a main frame on which a compressor and a motor for driving the compressor are arranged, and oil contained in compressed air discharged from the compressor are separated and recovered. In an oil-cooled air compressor in which an oil tank and an oil tank are arranged on a common base, an oil tank that is directly connected to the discharge port of the compressor and separates and stores oil contained in compressed air is provided separately from this oil tank. The separator is connected to the discharge port of the oil tank by piping and separates oil contained in the compressed air.The separator discharge port is connected to the heat exchanger, so maintenance of the separator is easy. become. Further, the oil tank only needs to have the functions of primary separation and oil storage of oil, so that the size can be reduced. Further, the downsizing of the oil tank enables integration with a compressor, a motor, and the like.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of an oil-cooled air compressor according to the present invention, wherein (A) is a plan view, (B) is a front view, and (C).
Is a side view.

2A and 2B show a gantry in FIG. 1, wherein FIG.
(B) is a front view, (C) is a side view.

FIG. 3 is a front sectional view of the separator in FIG. 1;

FIG. 4 shows a second embodiment of an oil tank in an oil-cooled air compressor according to the present invention, wherein (A) is a plan view,
(B) is a front view, (C) is a side view.

FIG. 5 shows a second embodiment of the oil-cooled air compressor according to the present invention, wherein (A) is a plan view, (B) is a front view, and (C).
Is a side view.

6A and 6B show a gantry in FIG. 5, where FIG.
(B) is a front view, (C) is a side view.

7A and 7B show an oil tank in FIG. 5, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body stand 1a Compressor base 1b Side plate 1c Pipe 1d Angle material 2 Compressor 4 Motor 5 Anti-vibration rubber 6 Common base 7 Oil tank 8 Anti-vibration rubber 9 Separator

Claims (5)

[Claims] An oil having a main base on which a compressor, a motor for driving the compressor are arranged, and an oil tank for separating and recovering oil contained in compressed air discharged from the compressor are arranged on a common base. In a cold air compressor, an oil tank that is directly connected to the discharge port of the compressor and separates and stores the oil contained in the compressed air is provided separately from the oil tank. An oil-cooled air compressor, comprising a separator connected to separate oil contained in compressed air. 2. The oil-cooled air compressor according to claim 1, wherein said main body base and said oil tank are mounted on a common base via separate vibration isolating rubbers. 3. The oil-cooled air compressor according to claim 1, wherein said oil tank is attached to said main body base. 4. The oil-cooled air compressor according to claim 1, wherein a height adjusting mechanism is provided on one of the main body stand and the oil tank. 5. A pair of pipes bent in an inverted U-shape, a pair of side plates fixed to lower ends of the pipes, and a pair of side plates fixed at predetermined intervals between the side plates. The oil-cooled air compressor according to any one of claims 1 to 4, comprising an angle member and a compressor base fixed to a top of the pipe.