JPH0446808Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an air dryer used for vehicle air brakes, etc. In particular, during the regeneration action that removes moisture adhering to the desiccant, small oil particles in the dried air become oil droplets. The present invention relates to an air dryer that can effectively prevent a desiccant from flowing into a desiccant.

Prior Art Conventionally, an air dryer 1 as shown in FIG. 4 has been used in an air brake system of a vehicle as a device for removing moisture from air compressed by an air compressor and sending dry air to an air tank. It was used. This air dryer 1 includes, for example, a purge tank 3 for performing a regeneration action to remove moisture adsorbed by a desiccant 2 from the adsorbent.
shows a structure that is integrated into the upper part of the air dryer main body 4. A check valve 5 is provided at the top of the air dryer body 4 to allow air to flow only from below to above, and an orifice 6 on the side of the check valve 5 allows air to flow backwards as shown by arrow A during regeneration to reduce pressure and expand. is formed, and the valve body 8 of the check valve 5 is
A compression spring 10 is biased against the valve seat 9, and upward movement of the compression spring is regulated by a retaining ring 12 that is engaged with a central cylindrical portion 11a of a lid member 11 that is fitted into the air dryer main body 4 from above. The upper end 10a is supported by a spring support 13. Inside the air dryer body 4, there is an air passage 14 around the periphery.
A cylinder 15 is housed in the cylinder 15, and a desiccant 2 is filled in the cylinder, and the desiccant is held down from the top by a desiccant holding plate 18 through a filter 16.
The upper end 19a of the desiccant holding plate is pressed downward by a compression spring 19 supported by the lid member 11. Referring also to FIG. 5, the desiccant holding plate 18 has a plurality of holes 1 for passing air.
8a is provided and is basically formed in the shape of a flat disk,
Further, the peripheries of the plurality of holes 18a were formed flat.

Therefore, in the conventional air dryer 1, when the dry air flows back from the purge tank 3 through the orifice 6 to the desiccant 2 as shown by arrow A during the regeneration operation, oil particles mixed in the dry air are removed from the air. Oil droplets 20 form as the pressure decreases and expands, but since the periphery of the hole 18a is flat and there is no structure to guide the oil droplet 20 to the outside, the oil droplet 20 flows into the hole 18a. This had the disadvantage that it adhered to the desiccant 2 and degraded the performance of the desiccant 2.
In order to eliminate this drawback, various oil filters have been used, but the oil droplets 20 cannot be removed sufficiently.

Furthermore, Japanese Patent Application Laid-Open No. 59-22627 discloses a compressed air drying device, but the conventional example is either integrated with a partition plate that presses the desiccant from above, or suspended from the lower surface of the ceiling of the main body. Although a technique has been disclosed in which a baffle member is provided in the buffle member to prevent oil from the backflowing drying air from collecting in the buffle member and being mixed into the desiccant, the oil accumulated in the buffle member There is no disclosure of any structure for easily discharging this oil to the outside, and in order to discharge this oil to the outside, there is an inconvenience that the compressed air drying device must be disassembled, and if this is neglected, the oil will be completely exhausted. There was a risk that it would overflow from the member and get mixed into the desiccant.

In addition, Japanese Patent Publication No. 45-30759 discloses a compressed gas drying device, but in this conventional example, a cup that opens upward is provided integrally with an upper backing plate that presses the desiccant, and oil is poured into the cup. The oil is simply stored therein, and like the conventional example described above, no means for discharging the collected oil to the outside is disclosed. Therefore, in order to drain the accumulated oil to the outside, the entire device had to be disassembled, and if this was not done, there was a risk that the oil would overflow from the cup and get mixed into the desiccant. .

Purpose The present invention was made in order to eliminate the drawbacks of the prior art described above, and its purpose is to provide an air dryer used for air brakes of vehicles, etc. a desiccant press plate that houses a desiccant therein, is disposed above the desiccant and presses the desiccant downward; and a desiccant press plate that is urged downward from a part integrated with the air dryer main body. The desiccant press plate of an air dryer is not formed into a flat plate shape, but is equipped with an oil droplet separating section that is convex upward with the center portion being the top, and a periphery of the oil droplet separating section. It consists of an oil reservoir portion formed in the oil reservoir portion and a cylindrical portion formed rising from the oil reservoir portion, and furthermore, a flange portion protruding upward is formed around the plurality of holes provided in the oil droplet separation portion. Also, by providing a pot to drain the oil accumulated in the oil reservoir to the outside, oil droplets are separated from the dry air and the separated oil droplets do not flow into the multiple holes. The method is to allow almost all of the oil droplets to accumulate in the oil reservoir, and when a certain amount of oil droplets have accumulated, the container is opened so that the oil droplets can be discharged to the outside of the air dryer. The purpose is to significantly reduce the amount of oil adhering to the agent and maintain good performance of the air dryer over a long period of time.

Configuration In short, the present invention includes a desiccant is housed in a space formed in the air dryer main body, a desiccant presser plate is disposed above the desiccant and presses the desiccant downward, and the desiccant presser is arranged above the desiccant to press the desiccant downward. In an air dryer equipped with a compression spring that presses the plate downward from a part integral with the air dryer main body, the central part to which the dry air is blown when the dry air flows back is the top of the air dryer. a desiccant holding plate consisting of an oil droplet separation section formed in a shape, an oil reservoir section formed around the oil droplet separation section, and a cylindrical section formed rising from the oil reservoir section; A pot is provided to drain accumulated oil to the outside.
Flange portions protruding upward are formed around the plurality of holes provided in the oil droplet separation portion of the desiccant holding plate, and an oil discharge port is formed in the cylindrical portion, and the oil discharge port is identical to the oil discharge port. It is characterized in that the flow channels of the above-mentioned pots are connected to each other at a height position.

The present invention will be explained below based on embodiments shown in the drawings. In the air dryer 31 according to the present invention shown in FIGS. 1 to 3, the same parts as those in the conventional example shown in FIG. The air dryer 31 according to the present invention is provided with a desiccant press plate 28 of a special shape, which is an improved version of the desiccant press plate 18 of the conventional example, and a pot 29.

The desiccant presser plate 28 has a central portion 28 to which dry air is blown when the dry air flows back.
An oil droplet separation part 28c formed in a truncated cone shape, which is an example of an upwardly convex shape with a as the top 28b, an oil pool part 28d formed around the oil droplet separation part, and an oil droplet separation part 28d that rises from the oil pool part. The formed cylindrical part 28e
It is composed of. And oil droplet separation section 28c
A plurality of holes 28f are formed to allow air to pass through, and flange portions 28g protruding upward are formed around the holes, respectively, and the oil droplet separation portion 20
is configured so that it does not flow into the hole.

The oil outlet 28h of the cot 29 has a flow path 29a formed in the cylindrical portion 28e of the desiccant holding plate 28.
The air dryer body 4 is connected to the air dryer body 4 at the same height.
The lever 29b is attached to the desiccant holding plate 28, and a lever 29b is attached so that oil droplets 20 accumulated in the oil reservoir 28d of the desiccant holding plate 28 can be discharged to the outside by operating the lever. In other cases, the lever 29 can be used to close the channel 29a and stop the discharge of the oil droplets 20.

The flange portions 28g of the plurality of holes 28h of the desiccant holding plate 28 can be formed, for example, by burring from below. Further, in the illustrated embodiment, the oil droplet separating portion 28c is formed in the shape of a truncated cone, but it may have any shape as long as it is upwardly convex; for example, it may have a rounded convex surface. It is clear that it may be formed.

In FIG. 1, 32 is an air inlet from an air compressor (not shown), 33 is an air outlet from the purge tank 3, 34 is a lower filter, and 35 is a lower desiccant presser. board, 36 is the bottom plate,
38 is a purge valve, 39 is a valve body, 40 is a control piston, 41 is a compression spring, 42 is a control port connected to a governor (not shown), and 43 is a control air passage.

Function The present invention is constructed as described above, and its function will be explained below. First, to explain the drying effect of normal air, air is not sent to the control port 42 due to the action of the governor, and therefore the air passage 43 is opened to atmospheric pressure, and as a result, the control piston 40 is moved by the compression spring 41.
The valve body 39 closes the purge valve 38 by being pressed upward by the purge valve 38 . Therefore, when high pressure air is sent from the air compressor to the inlet 32,
The air flows into the air passage 14 around the air dryer main body 4, flows downward through the air passage, and flows into the cylinder 15.
from below, passes through the filter 17 inward in the radial direction, further passes through the bottom plate 36, passes through the lower desiccant holding plate 35, further passes through the lower filter 34, is filtered, and enters the desiccant 2. The water is removed by the desiccant, dried, and further filtered by the filter 16 to pass through the plurality of holes 2 of the desiccant holding plate 28.
8f, the valve body 8 of the check valve 5 is compressed by the compression spring 10.
It is pushed up against the pressing force of , enters the purge tank 3 through the center hole 13a of the spring receiver 13, and is sent out from the discharge port 33 to an air tank (not shown). Through this series of actions, the moist air is dried and sequentially stored in the air tank. If such a drying action is continued, a large amount of water will adhere to the desiccant 2, and when it reaches the limit of its water absorption function, it will no longer be able to absorb any more water.

Next, the regenerating effect of the desiccant 2 in such a case will be explained. During this regeneration operation, the governor acts to send air to the control port 42, the pressure inside the air passage 43 increases, and the control piston 40 is pressed downward against the pressing force of the compression spring 41. The valve body 39 similarly moves downward, and the purge valve 38 is opened. Therefore, the inside of the air dryer body 4 is a cylinder 1.
5 is also exposed to atmospheric pressure. As a result, the air in the purge tank 3 flows into the air dryer main body 4 through the orifice 6, and since the cross-sectional area of the orifice 6 is very small, the dry air expands rapidly after passing through the orifice 6. As a result, the air becomes extremely dry, and the oil particles contained in the air become oil droplets and fall onto the desiccant holding plate 28 as shown in FIG. Since a flange portion 28g projecting upward is formed around the hole 28f, the oil droplets cannot flow into the hole 28f.
The oil drops flow down the slope of the oil droplet separating section 28c from the top section 28b and accumulate in the oil reservoir section 28d. As a result, there is a very small possibility that oil droplets 20 formed by aggregation of oil particles in the dry air will flow into the desiccant 2 through the filter 16, and the desiccant will be contaminated with oil. performance will hardly deteriorate. Further, when more than a certain amount of oil droplets 20 accumulate in the oil reservoir 28d, the channel 29a is opened by opening the lever 29b of the pot 29 as shown in FIG. 1 or 2. All of the oil droplets 20 can be discharged to the outside through the pot as shown by arrow D. Then lever 2
If 9b is closed, the oil droplet 20 will return to the oil reservoir 28.
It will accumulate little by little in d.

As described above, according to the present invention, the possibility that oil droplets 20 formed by aggregation of oil particles in dry air will adhere to the desiccant 2 during the regeneration action of the desiccant 2 is extremely reduced. Deterioration of the performance of the desiccant 2 can be prevented.

Effects The present invention is an air dryer used for vehicle air brakes, etc. as described above, in which a desiccant is stored in a space formed in the air dryer body,
An air dryer comprising: a desiccant pressing plate disposed above the desiccant to press the desiccant downward; and a compression spring pressing the desiccant pressing plate downward from a part integrated with the air dryer main body. The desiccant holding plate is not formed into a flat plate shape, but has an oil droplet separation part formed in an upwardly convex shape with the center part being the top, and an oil sump part formed around the oil droplet separation part. , and a cylindrical part formed rising up from the oil sump part, and a flange part protruding upward is formed around the plurality of holes provided in the oil droplet separation part, and a cylindrical part formed rising from the oil sump part. Since a pot is provided to drain the oil to the outside, the oil droplets are separated from the dry air, and the separated oil droplets do not flow into the multiple holes, and almost all of the oil drops go into the oil reservoir. Once a certain amount of oil droplets have accumulated, the container can be opened and the oil droplets can be discharged to the outside of the air dryer, resulting in a significant reduction in the amount of oil adhering to the desiccant. The effect is that the performance of the air dryer can be maintained well over a long period of time.

[Brief explanation of the drawing]

Figures 1 to 3 relate to embodiments of the present invention, with Figure 1 being a longitudinal cross-sectional view of an air dryer, Figure 2 being a longitudinal cross-sectional view of essential parts showing how oil droplets are separated, and Figure 3 being a desiccant presser. The perspective views of the plate, FIGS. 4 and 5, relate to the conventional example, with FIG. 4 being a longitudinal sectional view similar to FIG. 2, and FIG. 5 being a perspective view similar to FIG. 3. 20 is an oil droplet, 28 is a desiccant pressing plate, 28a is a center part, 28b is a top part, 28c is an oil droplet separation part, 28
d is an oil reservoir portion, 28e is a cylindrical portion, 28f is a plurality of holes, 28g is a flange portion, 29 is a pot, and 31 is an air dryer.

Claims (1)

[Scope of utility model registration request] A desiccant is housed in a space formed in the air dryer main body, a desiccant pressing plate is disposed above the desiccant and presses the desiccant downward, and the desiccant pressing plate is integrated with the air dryer main body. In an air dryer equipped with a compression spring that presses downward from a portion of A desiccant holding plate includes a separating section, an oil reservoir formed around the oil droplet separating section, and a cylindrical section formed rising from the oil reservoir, and a desiccant holding plate for removing oil accumulated in the oil reservoir to the outside. A flange portion protruding upward is formed around each of the plurality of holes provided in the oil droplet separation portion of the desiccant holding plate, and an oil discharge port is provided in the cylindrical portion. 1. An air dryer characterized in that the air dryer is formed with a flow path of the pot and is connected in communication with the oil outlet at a position at the same height as the oil discharge port.