JPS6110736Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an oil-fed compressor.

In an oil-cooled compressor, the compressed gas discharged from the compressed gas contains oil for cooling and lubricating the compressor body, so oil is used to separate the compressed gas and oil. Separate tanks (also called oil storage tanks) are used. There are two types of oil separation tanks: vertical types that extend vertically and discharge the compressed gas upward after oil has been removed, and horizontal types that extend horizontally and discharge the compressed gas to the sides. However, in the case of a unit type compressor, in which the main body of the compressor, the motor that drives it, and other auxiliary equipment are placed on an oil separation tank, the oil separation tank is generally of a horizontal type.

On the other hand, if only the separation action of the oil separation tank were used, a large amount of fine particulate oil (hereinafter referred to as oil mist) floating on the oil surface inside the tank would be discharged to the outside together with the compressed gas. , a filter for removing oil mist is separately equipped.

Conventionally, in order to equip a horizontal oil separation tank with the above-mentioned filter, a communication port communicating with the inside and outside of the tank is provided in a filter holding frame fixed in the oil separation tank so that its center line extends in the horizontal direction. It was configured by connecting one end of a cylindrical filter element located upstream of the communication port to the communication port. The compressed gas containing oil mist is
The oil mist is removed by flowing from the external space of the cylindrical filter element to the internal space through the cylindrical filter element, and is then discharged from the internal space to the outside of the oil separation tank through the communication port. It's getting old.

However, in the above conventional filter, since the compressed gas flows through the internal space of the cylindrical filter element along its axial direction, the oil collected in the cylindrical filter element also tends to flow in the same direction. As a result, oil on the inner peripheral wall of one end of the cylindrical filter element (the end connected to the communication port) often escapes downstream through the inner peripheral wall of the communication port, improving oil separation efficiency. This was not desirable in terms of reducing oil consumption.

The present invention solves the above-mentioned problems by extending a cylindrical trap that loosely fits into the cylindrical filter element from the periphery of the communication port, so that the cylindrical filter element can be collected. It is characterized by preventing oil from flowing into the communication port.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a compressor body of a screw type, vane type, etc., and an input shaft 1a of the main body 1 is connected to a drive shaft 2a of a motor 2 via a joint 3. A suction throttle valve 4 is installed at the suction port of the main body 1.
is connected, and the discharge port is opened above the oil level of the oil separation tank 6 via the discharge pipe 5.

The pressure in the oil separation tank 6 is introduced to the suction throttle valve 4 through a pipe 7, and the opening of the suction throttle valve 4 is adjusted according to the magnitude of the introduced pressure. An oil pipe 8 extending from below the oil surface of the tank 6 passes through a cooler (heat exchanger) 9 and is then connected to an oil injection port of the main body 1. The cooler 9 is connected to a cooling fan 10 driven by a motor 2.
The cooling effect is provided by the
Furthermore, a portion of the oil collected by a filter 11 disposed in the tank 6 is guided to an oil injection port of the main body 1 through an oil piping 12 .
The compressed gas which has passed through the filter 11 is guided via a pressure adjusting valve 13 and a stop valve 14 to appropriate equipment (not shown) which requires compressed gas.

As shown in FIG. 2, the tank 6 is composed of a cylindrical tank body 6a extending laterally, and a pair of left and right lid plates 6b and 6c that close the left and right opening ends of the tank body and serve as side walls thereof. The filter 11 is installed horizontally in the tank 6 using the left cover plate 6b.
Fixedly placed inside. That is, filter 1
1 is a substantially cylindrical frame body 1 that is integrated with each other;
5A, cap 15B, and cylindrical cover 15C
A filter element holding frame 15 is constructed, and the holding frame 15 connects the flange portion of the frame body 15A to the tank body 6a through the packings 16 and 17.
It is fixed and held on the oil surface of the tank 6 by being clamped between the left cover plate 6b and the left cover plate 6b.

The center line of the frame main body 15A coincides with the center line of the cover plate 6b, and a disc-shaped filter element 18 is fitted and held inside the frame main body 15A. Furthermore, a communication port 19 having a smaller diameter than the filter element 18 is opened on the right end side in the figure of the frame body 15A, that is, on the upstream side of the flow of compressed gas, which will be described later. , the downstream end of a cylindrical filter element 20 disposed on the upstream side is connected. This cylindrical filter element 20 is held between the frame body 15A and the cap 15B in its axial direction, and its entire periphery is covered by the cover 15C that loosely fits onto the cylindrical filter element 20. . Furthermore, the communication port 1 of the frame body 15A
A cylindrical trap 21 coaxially extends from the peripheral edge of the filter element 9 into the internal space A of the cylindrical filter element 20.
The outer diameter of the cylindrical trap 21 is smaller than the inner diameter of the cylindrical filter element 20, and the two 21 and 20 are loosely fitted. This cylindrical trap 21 can be integrally formed with the frame body 15A by, for example, drawing the frame body 15A (in the case of sheet metal processing) or injection molding (in the case of manufacturing from synthetic resin). In this case, a positioning step 22 into which the inner diameter of one end of the cylindrical filament element 20 fits for positioning can also be formed at the same time.

The cover 15C has a compressed gas inlet 23 at the right end of its upper wall, and an oil return port 24 at the left end of its lower wall. In FIG. 2, 25 is a connection port for the discharge pipe 5, 26 is a connection port for the compressed gas discharge pipe 27, and 28 is a connection port for the oil pipe 12.

Next, the operation of the above structure will be described. Since the operation of the entire system diagram shown in FIG. 1 is the same as that of the conventional system, the explanation thereof will be omitted, and the explanation will focus on the oil separation operation of the filter 11. First, the compressed gas and oil discharged from the compressor main body 1 are discharged into the interior of the tank 6 through the connection port 25, where most of the oil is separated from the compressed gas. Then, the compressed gas in the tank 6 enters the filter 11 from the inlet 23,
After passing through the cylindrical filter element 11, it is discharged from the internal space A, through the communication port 19, the disc-shaped filter element 18, and out of the tank 6 from the connection port 26. The oil mist contained in the compressed gas is collected when passing through both filter elements 18 and 20, and the oil collected in the cylindrical filter element 20 moves downward due to its weight and returns to the oil. The oil dripped from the port 24 onto the oil surface in the tank 6 and collected by the disc-shaped filter element 18 is directly fed under pressure to the compressor main body 1 from the connection port 28 .

Here, the oil collected in the cylindrical filter element 20, especially the oil collected in the upper wall portion, moves toward the communication port 19, as can be easily understood from the flow direction of the compressed gas (Fig. However, because of the cylindrical trap 21, it is prevented from flowing along the inner peripheral edge of the communication port 19 to the downstream side. In addition, the cylindrical trap 21 allows
At the end of the cylindrical filter element 20 on the communication port 19 side,
Movement of oil due to the flow of compressed gas is less likely to occur, and oil collected by the cylindrical filter element 20 is further prevented from flowing to the communication port 19.

As is clear from the above, the present invention
The oil collected by the cylindrical filter element 20 flows through the communication port 19.
This prevents the oil from flowing towards the target, improving oil separation and reducing oil consumption. Also,
The fact that the oil collected by the cylindrical filter element 20 does not escape to the downstream side means that the other filter element 18 installed on the downstream side can be made smaller, or it becomes unnecessary to separately provide it, resulting in cost reduction. can be achieved. Furthermore, since only the cylindrical trap is provided, the design can be implemented at low cost without major design changes to the specifications of the conventional product.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an oil-fed compressor to which the present invention is applied, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1. 6...Oil separation tank, 11...Filter, 15
...Filter element holding frame, 19...Communication port, 20
...Cylindrical filter element, A...Inner space, 21...
...Cylindrical trap.

Claims (1)

[Claims for Utility Model Registration] A filter element holding frame extending in the horizontal direction is provided on the cover plate of the horizontal oil separation tank, and the filter element holding frame has a center line extending horizontally to the inside and outside of the oil separation tank. A communication port extending in the oil separation tank is provided, one end of a cylindrical filter element extending in the transverse direction is connected to the communication port, and a compressed gas discharge pipe is communicated with the lid plate, and the compressed gas in the oil separation tank is discharged. In an oil-cooled compressor, the compressed gas is caused to flow from an inlet provided at an upper part of the filter element holding frame to the communication port through the cylindrical filter element, from the periphery of the communication port to the cylinder. An oil-cooled compressor characterized in that a cylindrical trap is loosely fitted and extends laterally into the inside of a shaped filter element.