JPH0541767Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a compressed air drying device that dries compressed air discharged from an air compression device, and is used in pneumatic circuits such as air brake devices of vehicles. The present invention relates to techniques that are effective for use in compressed air drying equipment.

(Prior Art) This type of compressed air drying device has an internal space connected to an inlet connected to an air compressor (hereinafter referred to as a compressor) and an outlet connected to a compressed air storage tank (hereinafter referred to as an air tank). a drying container disposed in the internal space of the main body with one end communicating with the inlet and the other end communicating with the outlet and containing a desiccant therein; A filter is known which is provided with a filter disposed across the flow path up to the inlet. The filter in this conventional compressed air drying device has a cylindrical shape, and its end face is attached to the other end side of the drying container, as described in, for example, Japanese Patent Application Laid-Open No. 59-69127. A fluid passage was formed through which the inflowing compressed air escapes from the outer peripheral surface of the cylindrical filter to the inner peripheral surface in a radial direction (that is, in the filter cylinder thickness direction). The compressed air from which compressor oil and dust have been removed after passing through the filter flows into the drying container from inside the cylinder of the filter, is dried by a desiccant, and is sent from the outlet to the air tank.
Note that the reason why the filter has a cylindrical shape is to effectively utilize the internal space of the main body and to reduce the height of the entire device.

(Problem to be solved by the invention) When comparing filters made of the same material, the longer the flow path length of the compressed air filter, the better the filtration performance of a filter that removes compressor oil and dust. , in the above conventional structure,
Since the flow path inside the filter is formed in the radial direction of the cylindrical filter, it is difficult to make the flow path long enough within the limited space where the filter is installed, which further improves filtration performance. It was not always easy to do so. In addition, if the thickness of the filter tube is increased to ensure a sufficiently long flow path length,
A problem arises in that the size of the filter becomes large and the compressed air drying device becomes large.

This invention takes the above problems into consideration and aims to further improve the filtration performance without increasing the size of the filter.

(Means for solving the problem) In this invention, in order to solve the above problem,
An annular sealed container is used as the container for accommodating the filter, and the inside of the container is partitioned into a plurality of partitions in the circumferential direction by a plurality of partition walls, and a filter is placed in each partitioned fluid passage along the circumferential direction. In addition, openings are provided in the walls of the container at one end and the other end of each fluid passage, and one opening is connected to the inlet and the other opening is connected to the desiccant side in the drying container. The length of each fluid passage is greater than the radial thickness of the filter within the annular container, and the plurality of fluid passages are arranged in parallel between the inlet and the desiccant side.

(Function) In the above configuration, compressed air flowing in from the inlet of the main body enters the filter from one opening of the container housing the filter, and passes through each of the plurality of fluid passages formed by the container wall and the partition wall. Then, it flows out from the other opening. The fluid passage within the filter is sufficiently long compared to the fluid passage passing through the filter in the radial direction, so that compressor oil and dust can be removed more reliably. Next, it enters a drying container and is dried with a desiccant agent before being sent to an air tank. In particular, with this device, the length of the flow path inside the filter is long, and in addition to providing sufficient filtration function, multiple fluid paths are arranged in parallel, so clogging may occur in one section. Even if it is, other fluid passages can cover it.

(Embodiment) An embodiment of this invention will be described with reference to FIGS. 1 to 4. Main body 2 of compressed air drying device 1
It consists of an upper member 3 forming a lid and a lower member 5 serving also as a casing for the discharge valve 4. Both the upper and lower members 3 and 5 are made of metal such as aluminum, and are integrally and airtightly fixed to the upper inner periphery of the lower member 5 with a seal ring 6 interposed therebetween by a plurality of bolts 7. A compressed air inlet 8 connected to a compressor (not shown) is provided on the upper side, and a control port 9 connected to a pressure governor (not shown) is provided on the lower side of the lower member 5.

A boss portion 10 is formed in the center of the upper member 3, and an outlet 11 is provided inside the boss portion 10 to communicate with an air tank (not shown). A check valve 12 is provided. Note that a bypass 13 is provided at the valve seat portion of the check valve 12, which serves as a purge air passage when performing air purge to regenerate the desiccant.
is provided. The body 2 thus forms an internal space 14 communicating with an inlet 8 communicating with the compressor and an outlet 11 communicating with the air tank.

The interior space 14 of the main body 2 accommodates a desiccant 15 for removing moisture and a filter 16 for removing compressor oil and dust.

The desiccant 15 is filled in a cylindrical drying container 17 with a bottom. A communication hole 18 is bored in the bottom 17a of this drying container 17.
A lower partition 21 consisting of a metal support plate 19 with a large number of holes and a foamed plastic partition plate 20 is laid on the raised part of the ridge 7a, and the desiccant 15 is stacked on top of this partition 21. The lower partition 21 is provided on the upper surface of the filled desiccant 15.
A partition 21 similar to the above is mounted. The support plate 19 of the upper partition 21 is pressed down by a spring 22 whose one end is placed against the lower surface of the upper member 3.

This invention is characterized by the filter 16, and as shown in detail in FIGS. 2 to 4, a cylindrical inner wall 23, a cylindrical outer wall 24 concentric therewith,
The interior of the container 27, which forms an annular space with the upper wall 25 and the lower wall 26, has three partition walls 28, for example.
It is partitioned into three sections in the circumferential direction, and a filter 16 is housed in each section. Various materials can be used for the filter 16, such as asbestos, felt, ceramic, or sponge-like materials. In this case, the same material may be placed in each compartment inside the container 27, or a material with low passage resistance may be placed near the opening 27a on the inflow side, and a material with low passage resistance may be placed in the area close to the opening 27b on the outflow side. It is also possible to arrange a plurality of different objects in the same section, such as arranging objects with relatively high passage resistance close to each other. This point can be determined by taking into consideration the length of the flow path in the filter, the passage resistance, and the like. Therefore, in some cases, filter 1
It is also possible to provide a space between one part of 6 and another part. Further, an opening 27a on the inflow side is provided in the lower wall 26 on one side in the circumferential direction sandwiching each partition wall 28, and an opening 27a on the outflow side is provided in the upper wall 25 on the other side.
b is opened, and each of the three sections forms one fluid passage continuous in a one-third arc extending from the opening 27a on the lower wall 26 side to the opening 27b on the upper wall 25 side. In each opening 27a, 27b,
Guide plates 27c and 27d are provided at an angle to allow compressed air to flow in and out smoothly.

Note that the container 27 is located at the bottom 1 of the drying container 17.
The top wall 2 of the container 27 is fitted into the positioning protrusion 17b formed in the center of the container 27 so as to protrude downward.
5 and the outer peripheral edges of the bottom 17a of the drying container 17,
They are in airtight contact via a seal member 29. Positioning protrusion 17b on bottom 17a of drying container 17
is fitted into the positioning hole 31 of the boss 30 on the upper part of the casing of the discharge valve 4, thereby positioning the drying container 17 and the filter 16 relative to the main body 2 of the container 27. Reference numeral 32 indicates the positioning protrusion 1
This is a gasket that prevents leakage from part 7b.

The discharge valve 4 serves both as a drain discharge valve and as an open valve to the atmosphere during the regeneration cycle of the desiccant 15. Since this itself is publicly known, a brief explanation will be given of the plug 33.
A valve member 36 is fixed to the lower end of a control piston 35 housed in a slidable manner and biased by a spring 34, and this valve member 36 is configured to be able to come into contact with a tapered valve seat 37. be. When the pressure inside the air tank reaches a certain value or more, the pressure acts on the pressure receiving part 35a at the upper end of the control piston 35 through the control port 9, pushing down the control piston 35, and the discharge valve 4 will be released.

In the compressed air drying apparatus configured as described above, compressed air from the compressor flows into the main body 2 from the inlet 8, and the main body 2 and the drying container 17
The container 2 containing the filter 16 passes between the
7 into the container walls 23, 24, 2 as shown by arrow A from three openings 27a provided in the lower wall 26.
The fluid flows out from the respective openings 27b on the upper wall 25 side as shown by the arrows B through the three fluid passages divided by the partition walls 28 and 5, 26 and the partition wall 28. Each of the three fluid passages in this filter 16 is
The length of the flow path is one-quarter of a circular arc, which is sufficiently long to ensure that compressor oil and dust are removed.
In order to form such a long flow path length, it is not necessary to increase the thickness of the filter 16 in the radial direction, and the filter does not become large.

As described above, the compressed air passing through the filter 16 and exiting from the opening 27b on the top wall 25 side flows into the drying container 1 through the communication hole 18 in the bottom 17a of the drying container 17.
7, passes through the partition 21, and while passing through the desiccant 15, moisture is adsorbed and dried, passes through the upper partition 21, passes through the check valve 12 in the forward direction,
The air is sent from the outlet 11 to an air tank (not shown).

In the above-mentioned embodiment, the container 27 containing the filter 16 is divided into three fluid passages, but it is also possible to form a plurality of fluid passages, such as two or four, and to separate each fluid passage. It is also possible to partition the flow path so that the length of the flow path is longer than the thickness of the filter 16.

Further, the openings 27a and 27b in the embodiment are
6. Although the openings are opened in the upper wall 25, any part of the container wall may be used as long as these openings communicate with the inlet 8 of the main body 2 or the desiccant side in the drying container 17, respectively.

Furthermore, although the fluid passages in the embodiment are formed continuously in the circumferential direction, it is assumed that the flow passages are created along the circumferential direction. partitions, such as forming a continuous fluid passage from the lower tier to the upper tier.
In short, any structure is sufficient as long as it can form a flow path longer than the flow path that simply passes through the filter in the radial direction by the container wall, partition wall, and opening, as described above.

Furthermore, the spaces between the outer peripheral surfaces of the drying container 17 and the filter container 27 and the inner peripheral surface of the main body 2 are simply passages for compressed air, but in order to make effective use of these spaces, the filter container 27 is For example, the shape may be enlarged so as to embrace a certain portion of the lower part of the drying container 17. In this case, it is preferable to form a downward passage along the inner circumferential surface of the main body 2 as an escape for the drain.

(Effects of the invention) As explained above, according to this invention, a partition wall is provided in the container housing the filter, and
By providing openings on the inflow side and outflow side, we formed a fluid passage that runs along the circumference from one opening to the other, compared to the conventional fluid passage that simply exits in the radial direction of the filter. , it is possible to obtain a sufficiently long flow path length within the filter, and therefore, the filtration performance for removing compressor oil and dust can be easily improved without increasing the size of the filter.

In addition, since a sufficiently long channel length within the filter can be obtained, the degree of freedom in selecting and arranging filter elements increases, allowing for the use of appropriate elements.
Moreover, by adopting a packed structure, the filtration performance can be further improved.

Furthermore, with this design, multiple fluid channels are arranged in parallel between the inlet and the desiccant side, so even if one section becomes clogged, other fluid channels will cover it. be able to.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a sectional view of the compressed air drying device, FIG. 2 is a partially cutaway plan view of the container containing the filter in FIG. 1, FIG. FIG. 2 is a sectional view taken along the - line in FIG. 2; 2...Body, 8...Inlet, 11...Exit, 14
...Internal space, 15... Desiccant, 16... Filter, 17... Drying container, 23... Cylindrical inner wall, 2
4...Cylindrical outer wall, 25...Top wall, 26...Bottom wall, 27...Container, 27a, 27b...Opening,
28...Partition wall.

Claims (1)

[Scope of utility model registration request] A main body that communicates with an inlet connected to an air compression device and an outlet connected to a compressed air storage tank to form an internal space, and the internal space of the main body has one end connected to the inlet and the other end connected to the outlet. A compressed air drying apparatus comprising: a drying container disposed in the drying container and containing a desiccant therein; and a filter disposed across a flow path between the desiccant and the inlet of the drying container. A ring-shaped sealed container is used as the container for accommodating the filter, and the inside of the container is partitioned into a plurality of sections in the circumferential direction by a plurality of partition walls,
The filter is accommodated in each partitioned fluid passage along the circumferential direction, and an opening is provided in the container wall at one end and the other end of each fluid passage, and one opening is used as an inlet and the other opening is used as an inlet. Each of the fluid passages is connected to the desiccant side in the drying container, and the length of each of the fluid passages is greater than the radial thickness of the filter in the annular container, and the plurality of fluid passages are connected to the inlet. A compressed air drying device arranged in parallel with the desiccant side.