JPH0618073Y2 - Drain discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drain discharge device suitable for use when a plurality of air treatment devices such as air compressors are arranged in parallel.

[Conventional technology]

Generally, in a manufacturing plant or the like, compressed air supplied from an air compressor is ejected from an air gun to remove dust and the like from products. In addition, compressed air that has been dehumidified to a higher degree is supplied to locations such as clean rooms that require particularly high-purity air. In this case, the compressed air from the compressor is supplied to the air dryer to completely dehumidify the compressed air. .

For this reason, the air dryer has a function of removing the moisture in the compressed air by dew condensation, and the removed drain is discharged to the outside through the auto drain trap. On the other hand, the air compressor also has a function of removing moisture that has condensed due to the compression of air and an auto drain trap, and the drain that has been removed is discharged to the outside as in the case of the air dryer.

[Problems to be solved by the invention]

However, the above-mentioned conventional technique has the following problems.

First, the auto drain trap is provided for both the air compressor and the air dryer, and is attached so as to project laterally from the main body in relation to drainage. Therefore, the installation space is unnecessarily large and the drain is discharged from a plurality of different positions, which causes a problem that the drainage facility becomes complicated.

Secondly, since a relatively expensive auto drain trap is provided in both the air compressor and the air dryer, there is a problem that the cost of parts also increases.

[Means for solving problems]

The present invention is intended to provide a drain discharge device that solves the problems existing in the above-mentioned conventional techniques, and is achieved by a device 1 shown below.

That is, the drain discharge device 1 according to the present invention is provided with a common auto drain trap 5 for a plurality of air treatment devices having a function of removing moisture in the air, for example, the air compressor 3 and the air dryer 4, and guides the removed drain. The drain pipes 6 and 7 are connected to the auto drain trap 5 from the air compressor 3 and the air dryer 4, respectively, and the drain pipe 6 or 7 having a relatively high internal pressure is provided with a decompression means 8 using a capillary tube or the like. And

[Action]

 Next, the operation of the present invention will be described.

In the drain discharge device 1 according to the present invention, drains from the air compressor 3 and the air dryer 4, which are air treatment devices, are introduced into the common auto drain trap 5 through the drain pipes 6 and 7. At this time, the drain pipe 6 or 7 having a relatively high internal pressure is decompressed by the decompression means 8 using a capillary tube or the like, and the discharge pressures of the drain pipes 6 and 7 in the auto drain trap 5 are balanced and The drains from the drainage pipes 6 and 7 are guided into the auto drain trap 5 and discharged to the outside.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an internal structure diagram of an air compressor and an air dryer equipped with a drain discharge device according to the present invention, FIG. 2 is a system diagram of the air compressor and air dryer, and FIG. 3 is a partial vertical front view of the drain discharge device. FIG. 4 is a partially longitudinal front view showing another embodiment of the drain discharge device.

First, in order to clarify the present invention, a schematic configuration of an air compressor and an air dryer, which are air treatment devices, will be described with reference to FIGS. 1 and 2. In addition, in order to facilitate understanding, the same reference numerals are given to the same portions in FIGS.

3 is an air compressor. This air compressor 3
The outside air is sucked through the suction filter 13, and the sucked outside air is compressed by the screw compressor 14. The compressed air is supplied to the aftercooler 16 via the oil recovery unit 15, and the dew condensation water in the compressed air drains the drain separator 17.
The compressed air, which has been separated from the air, is stored in the drain case 33, and is dewatered, and is supplied to the air pipe 11. In the air compressor 3, 18 is an oil cooler and 19 is an air cooling fan.

On the other hand, 4 is an air dryer, which is usually placed near the air compressor 3. Compressed air from the air compressor 3 is supplied to the aftercooler 20 of the air dryer 4 via the air pipe 11. The compressed air is cooled by the aftercooler 20 and further supplied to the heat exchanger 21. The heat exchanger 21 includes a reheater and a refrigerator, and the compressed air from the aftercooler 20 is further cooled by the reheater and the refrigerator. As a result, the water in the compressed air that has condensed is discharged to the drain pipe 7 as drain. On the other hand, the compressed air cooled by the refrigerator is warmed by the reheater and sent to the clean room of the factory through the air pipe 12. In addition, in the air dryer 4, 22
Is a condenser, 23 is a compressor, and the heat exchanger 2
A refrigeration cycle 24 that cools the first refrigerator is configured.

Next, the drain discharge device 1 according to the present invention will be specifically described.

The drain pipe 7 provided in the air dryer 4 is an existing one formed of a relatively hard pipe member, and the horizontal branch portion 30a of the T-shaped pipe 30 is connected to the tip of the drain pipe 7. Further, the auto drain trap 5 is connected to the lower end of the vertical merging portion 30b, and the front end of the drain pipe 6 from the air compressor 3 is connected to the other horizontal branch portion 30c.

On the other hand, the drain separator 1 in the air compressor 3
A drain case 33 is connected to the lower end of 7 via a horizontal T-tube 32, and the drain case 33 is connected to the drain case 33.
It accommodates the drain injected from the horizontal T-tube 3
The rear end of the drainage pipe 6 is connected to the second horizontal outflow portion 32a.

By the way, when comparing the internal pressure of the drainage pipe 6 and the internal pressure of the drainage pipe 7, the internal pressure of the drainage pipe 6 is relatively higher. This is because compared to the air compressor 3 in the front stage, the air dryer 4 in the rear stage causes pressure loss due to piping resistance, etc., and the pressure difference when using an ordinary air compressor and air dryer is around 0.3 kg / cm ^2. . For this reason, the drainage pipe 6 is provided with a pressure reducing means 8 so that a large amount of compressed air is not bypassed.

Next, a specific configuration of the drain discharge device 1 including the pressure reducing means will be described with reference to FIG.

First, the drainage pipe 6 has a large-diameter pressure-resistant hose 35 and a nipple 36.
And 37 to the T-tube 30 and the horizontal T-tube 32. On the other hand, a capillary tube 38 that also serves as the pressure reducing means 8 is inserted into the pressure-resistant hose 35, the rear end is exposed to the bottom of the drain case 33, and the front end is passed through a matching tube 39 having different front and rear diameters. To communicate with the T-shaped tube 30. Further, an ejector portion 34 is configured by providing a small-diameter orifice 40 that connects the inside of the pressure resistant hose 35 and the inside of the T-shaped tube 30 at the front end position of the capillary tube 38. Therefore, a small amount of air is ejected from the orifice 40 into the T-shaped pipe 30 due to the difference between the internal pressure of the drain pipe 6 and the internal pressure of the drain pipe 7, and as a result, the negative pressure generated near the tip of the capillary tube 38 and the inside of the drain case 33. Due to the pressure difference between the inside of the T-shaped tube 30 and the inside of the capillary tube 38, the drain is sucked up.

According to this structure, even if the internal pressure difference is relatively small and the drain case 33 is low, the drain on the air compressor 3 side can be smoothly and reliably guided to the auto drain trap 5.

The auto drain trap 5 has a float 5a therein, and when a predetermined amount of drain is accumulated in the trap 5, the float 5a floats due to buoyancy and the drain hole 5b at the bottom is opened to discharge the drain to the outside. To do.

By the way, when only the drain pipe 7 is connected to the auto drain trap 5 as in the conventional case, the air flow in the drain pipe 7 and the auto drain trap 5 is stopped to cause an air lock that blocks the drain flow. However, it was also confirmed that this configuration can solve the problem by destroying the airlock by causing a small amount of air on the side of the air compressor 3 to enter the T-shaped tube 33.

FIG. 4 shows another embodiment of the drain discharge device including the pressure reducing means. In the embodiment shown in the figure, the bottom of the drain case 33 and the T
The horizontal branch portion 30c of the character tube 30 is simply connected by the capillary tube 50 which also serves as the pressure reducing means 8. When the drain case 33 is located higher than the T character tube 30, or the internal pressure of the drainage pipe 6 is relatively high. It can be fully functional at high cost.

Although the embodiments have been described in detail above, the present invention is not limited to such embodiments. For example, although the air compressor and the air dryer are illustrated as the plurality of air treatment devices, the invention can be applied to any air treatment device having a function of removing moisture in the air. It can also be applied to the case where a plurality of the same air compressors are operated. Furthermore, although the pressure reducing means uses a capillary tube and also serves as a drainage pipe, it may have a configuration in which an ordinary pressure resistant hose and a mechanism having a partial orifice such as a pressure reducing valve are combined. In addition, the detailed configuration, shape, arrangement, quantity, materials and the like can be arbitrarily changed and implemented without departing from the scope of the present invention.

[Effect of device]

As described above, the drain discharge device according to the present invention is provided with a common auto drain trap in a plurality of air treatment devices having a function of removing moisture in the air, and a drain pipe for guiding the drain is automatically operated from each of the air treatment devices. Since the pressure reducing means is provided in the discharge pipe which is connected to the drain trap and has a relatively high internal pressure, the following effects are obtained.

Since the protruding auto drain trap can be shared for each air treatment device, the cost of parts can be cut in half and the installation space of the device can be greatly reduced. In addition, the drain can be discharged to the outside at one place, and the drainage facility can be simplified.

The air lock phenomenon in the auto drain trap and the drain pipe, which has been a problem in the past, can be prevented. As a result, it is possible to solve the problem that the drain is not drained and stays.

It can be applied as is to existing air compressors and air dryers, and has excellent versatility.

[Brief description of drawings]

1 is an internal structure diagram of an air compressor and an air dryer equipped with a drain discharge device according to the present invention, FIG. 2 is a system diagram of the air compressor and air dryer, FIG. 3 is a partially longitudinal front view of the drain discharge device, FIG. 4 is a partially longitudinal front view showing another embodiment of the drain discharge device. In the drawings, 1: drain discharge device, 3: air compressor 4: air dryer 5, auto drain trap 6, 7: drain pipe, 8: pressure reducing means

Claims (1)

[Scope of utility model registration request] 1. A common auto drain trap is provided in a plurality of air treatment devices such as an air compressor and an air dryer having a function of removing water in the air, and a drain pipe for guiding the removed drain is automatically operated from each air treatment device. A drain discharge device characterized in that it is connected to a drain trap, and a drainage pipe having a relatively high internal pressure is provided with a pressure reducing means using a capillary tube or the like.