JPH0740154Y2 - Drain discharge device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a drain discharge device for discharging the water condensed and generated in the air line of a compressor, and in particular, a single drain device simultaneously removes the water in the air line. The present invention relates to a drain discharge device for discharging.

[Prior Art] FIG. 4 shows a conventional drain discharge pipe structure of a compressor airline.

The compressed air discharged from the compressor 4 is cooled by the aftercooler 5, then dried by the air dryer 6 and stored in the receiver tank 7, and is stored in the receiver tank 8 through the opening / closing valve 8 to the place where the air having a pressure lower than that of the compressor 4 is used, if necessary. Sent out. Since compressed air flows through the air line 9 in the order of the aftercooler 5, the air dryer 6 and the receiver tank 7, the air pressure for these various devices is naturally high in the order of the aftercooler 5, the air dryer 6 and the receiver tank 7. .

Drain is generated in the aftercooler 5, the air dryer 6, the receiver tank 7, and the pipe 10, and it is necessary to appropriately discharge the drain. In the conventional technology, the aftercooler 5, the air dryer 6, the receiver tank 7, and the drain pipes 11, 12, 1 of the pipeline 10 are used.
Auto drains 15, 16, 17, and 18 were connected to 3 and 14, respectively, and drains were discharged as needed.

[Problems to be Solved by the Invention] The discharge port of the conventionally used auto drain 15 etc. is generally small and therefore easily clogged, and it was necessary to clean it occasionally. Therefore, if a separate auto drain 15 or the like is arranged for each type of equipment, there is a problem in that it takes time and labor for maintenance. In addition, it was troublesome to deal with a failure.

FIG. 5 shows various devices of the conventional airline 9 connected to a single auto drain 19. In this case, the above problems are solved, but the following problems occur. That is, in this case, the aftercooler 5, the air dryer 6, the receiver tank 7, and the drain pipes 11, 12, 13, and 14 of the pipeline 10 are connected to one drain pipe 20 and communicate with the auto drain 19. For this reason, when the drain is discharged, a backflow as indicated by arrows A, B, and C occurs. That is, since the aftercooler 5 has a higher pressure than the air dryer 6, the air on the aftercooler 5 side flows into the air dryer 6 side through the drain pipes 11, 20, 12 when the drain is discharged. As a result, there arises a problem that each device cannot sufficiently perform its function. Therefore, in the prior art, drain discharge by the single auto drain 19 as shown in FIG. 5 could not be performed.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a drain discharge device that has a simple structure and is excellent in maintainability, because drain discharge is performed reliably, there is no circulation in various devices. And

[Means for Solving the Problems] In order to achieve the above object, the present invention is installed between an air discharge side of a compressor and an air use place at a pressure lower than that,
In a drain discharge device for discharging the drain generated in an air line provided with various equipments for cooling, drying, accumulating air, etc., the various equipments and the drain pipes of the pipelines are connected via a single pipeline. It is connected to a single drain device having an outlet with a diameter d ₁ , and a drain pipe of the equipment closest to the compressor is provided with a nozzle having a diameter d ₂ smaller than the diameter d _{1 of the} drain device. A drain discharge pipe is configured by arranging check valves for preventing backflow from the drain device side in the drain pipe of the device.

[Operation] When a single auto drain is opened and the drain begins to be discharged from the outlet of diameter d ₁ , the nozzle diameter d _{2 in} the drain pipe of the equipment closest to the compressor is smaller than the diameter d ₁ .
The pressure between the nozzle and the outlet becomes low. Therefore, the check valve in the drain pipe of the device other than the device is opened, and the drain is smoothly discharged from the various devices toward the auto drain. When the auto drain is closed, the check valve prevents back flow into each device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the drain discharge device in this embodiment. In the drawing, the same reference numerals as those in FIGS. 4 and 5 indicate the same or those having the same functions, and the description thereof will be omitted.

In FIG. 1, a nozzle 1 is provided in the drain pipe 11 of the aftercooler 5, and a check valve 2 is provided in the drain pipes 12, 13, 14 of the air dryer 6, the receiver tank 7 and the pipeline 10. . Further, the drain pipes 11, 12, 13, 14 that have passed through the nozzle 1 and the check valve 2 are connected to a single drain pipe 20. The drain pipe 20 is provided with a single drain device 3.

FIG. 2 shows a detailed structure of the drain device 3.

A ball valve 22 is provided below the main body 21, and a drain pipe is provided.
Connect to 20. An opening / closing valve 23 is provided downstream of the ball valve 22. Diameter of outlet 24 of ball valve 22
d ₁ is comprised having a large diameter compared with the conventional automatic valve 15 and the like, in the present embodiment is used as a dimension of 5mm as the diameter d _1. The diameter of the on-off valve 23 is the diameter d ₁ when fully opened.
It has a size equal to or larger than the above. Body
A motor 25 and a control mechanism 26 for rotating the ball valve 22 are built in the inside of the 21.

FIG. 3 shows a detailed structure of the nozzle 1 and the check valve 2 of the aftercooler 5 and the air dryer 6 connected to the drain device 3. Of course, the check valve 2 having the same structure as shown in FIG. 3 is also provided in the receiver tank 7 and the drain pipes 13 and 14 of the pipe line 10, but they are omitted.

The inside of the drain pipe 11 communicating with the aftercooler 5 is narrowed by the nozzle 1 and communicates with the drain device 3 side through the nozzle 1 having a diameter d ₂ . The diameter d _{2 of the} nozzle 1 is smaller than the diameter d ₁ of the ball valve 22, and in this embodiment, it is 3 mm. The check valve 2 has a ball 27 and a return spring 28.
And has a check valve structure in a direction for preventing backflow from the drain device 21 side.

Next, the operation of this embodiment will be described in more detail.

P ₁ the internal pressure of the aftercooler 5 side in the first state of closing the ball valve 22 of the drain device 3, when the internal pressure of the air dryer 6 side pressure of p ₂ and the ball valve 22 near the drain pipe 20 and p _3, the nozzle 1 Is always open, so p ₁ =
It becomes p ₃ . Further, since the air dryer 6 is constantly kept at a low pressure by the aftercooler 5, p ₂ <p ₁ holds.

Next, the motor 25 of the drain device 3 is operated and the ball valve
When 22 is opened and the opening / closing valve 23 is also fully opened, drain and air in the drain pipe 20 start to flow. In this case, since the diameter d ₁ is larger than the diameter d ₂ , the internal pressure p ₃ in the drain pipe 20 decreases,
The pressure becomes even lower than the internal pressure p ₂ . Therefore, the ball 27 of the check valve 2 is opened, and the drain from the air dryer 6 side is discharged from the drain device 3 through the drain pipe 20. At the same time, the drain of the aftercooler 5 also flows through the nozzle 1 and is discharged from the drain device 3.

Next, after a lapse of time, the ball valve of the drain device 3
When 22 is closed, the internal pressure p ₃ rises and p ₁ = p ₃ . Since the internal pressure p ₁ is higher than the internal pressure p ₂ , p ₃ > p ₂ . For this reason, a backflow is generated from the drain device 3 side to the air dryer 6 side, but the ball valve 27 of the check valve 2 is closed, so that no backflow is generated to the air dryer 6 side.

As described above, even if the single drain device 3 is used, there is no backflow between the various devices and the pipeline, and the drain is smoothly discharged.

On the other hand, the drain device 3 has a relatively large-diameter outlet 24, and hardly causes dust or the like to be clogged. It is also easy to install the nozzle 1 and the check valve 2 in the drain pipes 11 and 12, etc. Therefore, it can be implemented relatively inexpensively and easily.

In this embodiment, the airline 9 is shown in FIG. 1, but it is not limited to this. Also, the diameter d ₁ is 5 mm, the diameter
Although d _{2 is set} to 3 mm, an appropriate size is selected according to the structure and capacity of the airline 9. However, as described above, the internal pressure p ₃ at that portion may be the lowest when the ball valve 22 is opened. It is a structural requirement.

[Effects of the Invention] As is clear from the above description, according to the present invention, drainage is smoothly performed, maintenance is easy, and there is no failure.
In addition, each device can fully fulfill its function without unnecessary distribution between various devices.

[Brief description of drawings]

FIG. 1 is a layout view showing the overall structure of an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing the detailed structure of the drain device of the embodiment,
FIG. 4 is a sectional view showing the structure of the main part of this embodiment, FIG. 4 is a layout drawing showing the structure of a conventional drain discharge pipe, and FIG. 5 is a structure of a conventional drain discharge pipe using a single auto drain. FIG. 1 ... Nozzle, 2 ... Check valve, 3 ... Drain device, 4 ...
… Compressor, 5 …… Aftercooler, 6 …… Air dryer, 7 …… Receiver tank, 8,23 …… Open / close valve, 9
…… Air line, 10 …… Pipe, 11,12,13,14,20 …… Drain pipe, 15,16,17,18,19 …… Auto drain, 21 …… Main body,
22 …… Ball valve, 24 …… Discharge port, 25 …… Motor, 26
...... Control mechanism, 27 …… Ball, 28 …… Return spring.

Claims (1)

[Scope of utility model registration request] 1. A drain installed in an air line which is installed between an air discharge side of a compressor and an air use place at a pressure lower than that, and which is provided with various equipments for cooling, drying, storing, etc. of air. In the drain discharge device, the drain pipes of the various devices and pipelines are directly connected to a single drain device having a discharge port of diameter d ₁ via a single pipeline, and the drain pipes of the equipment closest to the compressor are connected. A nozzle having a diameter d ₂ smaller than the diameter d _{1 of the} drain device is provided, and check valves for preventing backflow from the drain device side are respectively provided in the drain pipes of the other devices. Drain discharge device.