JPH0527497U - Drain discharge device - Google Patents

Abstract

(57) [Summary] [Object] To provide a drain discharge device having a structure in which the oil content contained in the drain is not clogged in the porous body in the drain discharge device using the bubble point pressure of the porous body. [Composition] A porous body is provided inside by partitioning a drain inlet and a drain, and the bubble point pressure of the porous body is set to be higher than the gas pressure received by the inlet. In the drain discharge device, an oil fence is provided between the inlet and the porous body to prevent the oil contained in the drain from clogging the porous body, and the oil fence is a space partitioned by the oil fence. A drain discharge device comprising: a ventilation hole that communicates with the ventilation hole; and an eaves that prevents the drain from entering the ventilation hole on the drain introduction side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drain discharge device, and more specifically, for example, in the process of supplying compressed air from an air compressor (compressor) to an air tool or terminal equipment through a predetermined pipe, An air dryer used to remove oil (drain), etc., and a device for discharging the drain generated by condensation and separation to the outside.

[0002]

[Prior Art]

 Japanese Unexamined Patent Publication No. 3-140699 discloses a drain discharge device using bubble point pressure. The structure of the drain discharge device 21 will be described with reference to FIG. 4. A porous body 29 is provided inside the drain discharge port 21 by partitioning the drain inlet 25 and the discharge port 26, and the porous body 29 is a bubble point. The pressure is set higher than the pressure of the gas received by the inlet 25.

FIG. 4 is a drain discharge process of the drain discharge device. First, the drain flows from the inlet 25, the drain passes through the porous body 29 due to the interfacial tension of the porous body 29, and the drain that has passed therethrough. Is discharged to the outside through the outlet 26.

[0003]

[Problems to be solved by the device]

 However, the conventional device described above has the following problems to be solved. The problem is that the porous body is clogged with oil contained in the drain. Once the porous body is clogged, the drain cannot be discharged smoothly thereafter. Therefore, the function as the drain discharge device cannot be maintained. In view of these problems to be solved by the conventional device, the present invention has a structure in which the oil content contained in the drain is not clogged in the porous body in the drain discharge device using the bubble point pressure of the porous body. It is an object to provide a drain discharge device.

[0004]

[Means for Solving the Problems]

 The means is a device for discharging the drain contained in the compressed gas such as compressed air, and a porous body is provided inside the device for partitioning the drain inlet and outlet, and In the drain discharge device in which the bubble point pressure of the porous body is set higher than the pressure of the gas received by the inlet, the oil content contained in the drain between the inlet and the porous body is the porous body. In addition to having an oil fence that prevents the oil fence from being clogged, the oil fence is a ventilation hole that communicates the space partitioned by the oil fence, and an eaves that prevents the drain from entering the drain inlet side of the ventilation hole. And a drain discharge device characterized by being provided with.

Here, the bubble point pressure P is a pressure determined by the relationship between the interfacial tension between the liquid, the porous body and the gas (air) and the pore diameter of the porous body, and is derived by the following equation. P = K · 4πσ cos θ · 1 / d (K: pore shape correction coefficient, σ: surface tension, θ: solid-liquid contact angle, d: pore diameter of porous body).

[Action]

 With the above configuration, the drain inlet of this device is connected to, for example, the drain outlet of the air dryer, and when the air dryer is operated (operated), the condensed and separated drain generated while receiving a predetermined air pressure. It flows into the device from the inlet. The drained inflow continuously permeates into the pores of the porous body due to the capillary phenomenon, and is gradually pushed out by the air pressure, passes through the porous body (inside the pores), and is discharged. Is automatically discharged from the outside. In other words, when drainage flows into this device and the porous body is wet, the bubble point pressure of the porous body is set higher than the air pressure received at the inlet, so compressed air passes through this porous body. However, only the drain is continuously discharged due to the pressure difference between the inlet side and the outlet side. This is because in order to discharge the drain (water) that has permeated (absorbed) into the pores of the porous body and allow air to pass through, the air pressure is higher than the water absorption capacity due to the capillary phenomenon, that is, the bubble. This is because it must be above the point pressure. Thus, the gas having a pressure lower than the bubble point pressure of the porous body does not pass, but only the drain passes through the porous body and is discharged to the outside.

Further, since this device has an oil fence, the oil content of the drain having a low specific gravity existing near the inflowing drain liquid surface cannot move beyond the oil fence to the porous body side, resulting in the porous body. The oil content of the drain does not contact the body, and the porous body is not clogged with oil. Since the oil fence has a vent hole that connects the space partitioned by the oil fence, the pressure in the space partitioned by the oil fence can be made the same. Further, since this device is provided with an eave on the drain introduction side of the ventilation hole to prevent the drain from entering, the drain scattered from the drain introduction port does not directly enter the ventilation hole. Furthermore, even if the drain liquid level rises by making the lower end of the eaves horizontal, the drain liquid level traps air inside the eaves-vent holes-inside the oil fence when the drain liquid level reaches the lower end of the eaves. Even if the closed space is formed and the liquid level of the drain further rises, the liquid level inside the eaves is prevented from rising by the air in the closed space and hardly rises, so the drain does not flow into the porous body side from the ventilation hole. ..

[0007]

【Example】

 First Embodiment Next, a first embodiment of the device according to the present invention will be described in detail with reference to FIGS.

[Figure 1]

[Fig. 2]

FIG. 3 is a main body (simply referred to as a main body) 1 of the present invention, which is formed in a substantially cylindrical shape with an upper opening and a bottom plate integrally provided on the lower side, and a lid 2 on the upper side. It is fitted in an airtight manner through an O-ring packing 3 attached to the peripheral edge, and under the outer peripheral lower portion of the lid 2, a flange 1a is provided around the outer periphery of the upper end of the main body 1, and a cap nut 4 is screwed, and the lid 2 is fixed to the main body 1. However, one side of the lid 2 (the left side in FIG. 1) is provided with an inlet port 5 connected to an air dryer (not shown) to introduce (inflow) the drain into the main body 1, and the other side (FIG. 1). The right side) is provided with a discharge port 6 for discharging the inflowing drain. In this example, the inlet port 5 and the outlet port 6 are tapered for pipes in order to connect the pipes.

On the other hand, a tie rod 7 having screws at both ends is planted in the center of the lower portion of the lid 2, and a ring-shaped wall 2a is vertically provided concentrically with the tie rod 7, and one side of the wall 2a (see FIG. (1 right side) is connected to the drain discharge port 6 via the pipe line 8. Further, below the wall 2a, a cylindrical porous body 9 and an oil fence 12 which will be described later and are formed in a cylindrical shape are provided in a hanging shape with a ring packing 10. Then, the lower end surface side of the porous body 9 is held in a form of being lifted by the outer peripheral upper surface of the flange 11a of the tightening tool 11, and through a screw hole provided at the upper end of the shaft part 11b erected at the center of the tightening tool 11, It is screwed to the lower end of the tie rod 7, and holds the lid 2 and the oil fence 12, the oil fence 12 and the porous body 9, and the space between the porous body 9 and the flange 11a in an airtight manner. As a result, inside the apparatus, the porous body 9 is formed so as to partition the inlet 5 and the outlet 6, and the inlet 5 side of the further partitioned space is perforated by the acrylic resin oil fence 12. It is divided into Kb on the side of body 9 and Ka on the side of inlet 5. Further, the oil fence 12 is provided with a vent hole 12a for communicating the space partitioned by the oil fence 12 and an eaves 12b for preventing the drain from advancing to the drain inlet side of the vent hole 12a. ing.

By the way, it is necessary to form the porous body 9 so that the bubble point pressure thereof is set to be larger than the pressure of the gas received by the introduction port 5. Here, the manufacturing method of the one used in this example is illustrated. I'll do it. First, one alumina porous tube is prepared. However, in this example, an outer diameter of 11 mm, an inner diameter of 7 mm, a length of 50 mm, a porosity of 35%, and an average pore diameter of 3.1 μm are used. Also, alumina (average particle size 0.3 μm) 50 g water 45 ml ammonium polycarboxylate (dispersant) 0.2 g together with 150 g of 10 mm alumina spheres were put in a polyethylene container and mixed in a pot mill for 15 hours. Let it be slurry P.

First, a silicon tube is fitted in each of the upper part and the lower part of the perforated tube, and the suspension A is put in the lower silicon tube. Then, the lower tube is lifted to make the perforated tube substantially horizontal, and it is held for 25 seconds under this condition, and then the tube is lowered to remove the excess suspension A. As a result, the alumina particles of A are covered inside the porous tube. Next, this porous tube was dried at 80 ° C for 1 hour and then baked at 1350 ° C for 3 hours to form an alumina porous film (thin film) having a thickness of about 50 μm and an average pore diameter of about 0.2 μm. The bubble point pressure of the porous body 9 manufactured in this way and used in this example is set to about 10 kg / cm ^{2 for} water and about 5.5 kg / cm ² for compressor oil.

Now, the operation or effect of the apparatus of this example will be described. However, the porous body 9 is moistened or infiltrated by previously immersing it in water, and the inside of its pores is in a state of being blocked with water. When an air dryer (not shown) (air pressure is set to 5 kg / cm ² or less) is activated and the drain flows from the inlet 5, the drain first collects in the space outside the porous body 9 while continuously pouring. It penetrates into the pores of the body 9 by a capillary phenomenon and accumulates in the inner space. At this time, the liquid level of the drain accumulated in the inner space gradually rises due to the pressure applied to the outer space of the inlet 5, that is, the porous body 9, and the drain 6 passes through the pipe 8 in the form of overflow. Is discharged to the outside through a drain pipe (not shown). The arrows in the figure show the flow of drain.

In this case, when the present device operates as an auto drain and the porous body 9 is wet with the drain, the bubble point pressure of the porous body 9 is larger than the air pressure received by the introduction port 5, and therefore the compressed air is It does not pass through the porous body 9, that is, the gas does not leak. Thus, according to the apparatus of this example, the compressed air is not discharged (leaked) to the outside while operating as the auto drain, and only the drain is generated due to the pressure difference between the inlet 5 side and the outlet 6 side. Are discharged automatically and continuously. Moreover, since the device has a simple structure in which the inlet 5 side and the discharge port 6 side are partitioned by the porous body 9, there is no failure, and there is no gas leakage at the time of discharge, so noise and drain scattering Does not occur.

Furthermore, since the oil contained in the drain has a low specific gravity and exists near the liquid surface, the oil fence 12 made of acrylic resin does not go to the porous body 9 side Kb. Then, only the drain containing no oil can pass through the lower end of the oil fence 12 and move to the porous body 9 side. As a result, the oil contained in the drain does not come into direct contact with the porous body 9, and the porous body 9 itself is not clogged with the oil. Further, the oil fence 12 has a vent hole 12a for making the pressure in the space partitioned by the oil fence 12, that is, the pressure on the introduction port 5 side Ka and the pressure on the porous body 9 side Kb the same. Even if the drain is forced in, the ventilation hole 12a is provided with the eaves 12b made of the same material, and therefore the drain does not go from the ventilation hole 12 to the porous body 9 side Kb. This is because the eaves 12b prevent the drains scattered from the side or above the ventilation hole 12a from entering the ventilation hole 12 so as to cover the ventilation hole 12. In addition, when the liquid level reaches the lower end of the eaves 12b, the invasion of the drain due to the rise of the drain liquid level from below is such that the air is trapped inside the eaves-the vent hole-the inside of the oil fence. (Fig. 3) is formed, and even if the liquid level of the drain further rises, the liquid level inside the eaves 12b is hindered by the air in the closed space and hardly rises. Does not flow into the body 9 side. Since the height of the liquid surface of the inflowing drain (Z in the figure) does not fall below the lowermost end (X in the figure) of the porous body 9, the present apparatus uses the lowermost end of the oil fence 12 (Y in the figure). Is designed to be somewhat lower than X. Therefore, the oil component does not pass over the oil fence 12 and floats in the vicinity of the drain liquid surface and can be appropriately removed after the floating.

—Operation Test of First Embodiment— The drain discharge device of the first embodiment was attached to an air dryer (not shown) discharge port and continuously operated for 3 days. As a result, it was confirmed that water was discharged from the drain discharge device, and it was confirmed that the oil did not go over the oil fence 12 to the porous body 9 side but floated on the drain introduction 5 side.

Although the porous body used in each of the above-mentioned embodiments has a cylindrical shape, it may be any one as long as the inside of the device is partitioned between the inlet and the outlet of the drain, and therefore it is like a partition wall. Of course, you can Further, although the porous body is made of ceramic, it is not limited to this and may be metal, resin or the like. It will be selected appropriately according to the purpose and application of the device, but it is necessary to improve drainage efficiency that it has affinity with drain and that it easily penetrates into the pores. preferable. Further, the average pore diameter and the porosity may be appropriately selected and used according to the received gas pressure, bubble point pressure and the like. The material of the oil fence is resin, but the material is not limited to this, and metal or ceramic may be used. The material is selected and used according to the purpose and application of the device, but a lightweight and corrosion-resistant material is desirable.

Further, the shape of the eaves is not limited to the above-mentioned embodiment as long as it is a shape in which the drain does not easily enter, but it is desirable that the lower end of the eaves is horizontal. In addition, although the case where the present apparatus is attached to the air dryer is illustrated in the above embodiment, it can be used by being attached to various air apparatus such as an air brake system which uses compressed air as a power source, or pneumatic piping. Needless to say. Naturally, the applicable compressed gas is not limited to air, and the drain that can be discharged is not limited to water or oil.

[0017]

EFFECTS OF THE INVENTION As is clear from the above description, the drain discharge device according to the present invention is an auto drain that uses the bubble point pressure of the porous body, and therefore operates as an auto drain with a simple structure. Therefore, it is expected to have extremely high durability and reliability and to reduce manufacturing costs. Moreover, since the discharge of gas is effectively prevented during operation as an auto drain, there is no waste of gas (pressure loss), and therefore noise can be effectively prevented. In addition, since the drain is continuously discharged, it does not scatter, which is effective in preventing the surrounding pollution. Furthermore, since this device has an oil fence, the oil content of the drain with a low specific gravity that exists near the drain liquid surface cannot move beyond the oil fence to the porous body side, and as a result, the oil content of the drain in the porous body The porous body does not become clogged with oil without contact.

[Brief description of drawings]

FIG. 1 is a central longitudinal front view showing a first embodiment of a drain discharge device according to the present invention.

FIG. 2 is a sectional view taken along the line CC in FIG.

FIG. 3 is a central longitudinal front view showing a main part B in FIG.

FIG. 4 is a central longitudinal front view showing a conventional drain discharge device.

[Explanation of symbols]

 1, 21 Drain discharge device body 5, 25 Inlet port 6, 26 Discharge port 9, 29 Porous body 12 Oil fence 12a Vent hole 12b Eave

Claims (1)

[Scope of utility model registration request] 1. A device for discharging drain contained in compressed gas such as compressed air, wherein a porous body is provided inside the device for partitioning a drain inlet and a drain, and In the drain discharge device in which the bubble point pressure of the porous body is set higher than the pressure of the gas received by the inlet, the oil contained in the drain between the inlet and the porous body is the porous body. With an oil fence to prevent clogging in, the oil fence is a vent that communicates the space partitioned by the oil fence and a canopy to prevent the drain from entering the inlet side of the drain of the vent. A drain discharge device comprising: