JPH0647549Y2 - Compressed air dryer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pneumatic circuit using compressed air as a pressure source,
For example, the present invention relates to a compressed air drying device used in an air brake circuit of a vehicle or the like.

[Conventional technology and its problems]

For example, in Japanese Utility Model Application Laid-Open No. 64-21732, an inlet connected to an air compression device, an outlet connected to an air storage tank, and a main body having an internal void formed by connecting the inlet and the outlet. A dryer having one end connected to the inlet and the other end connected to the outlet in the internal space, a desiccant contained in the dryer, and both sides of the desiccant A pair of perforated plates, a filter disposed between one of the perforated plates and one end of the dryer, and the other of the other perforated plate stretched between the other perforated plate and the other end of the dryer. A compressed air drying device is disclosed, which includes a spring for urging a perforated plate toward the desiccant side, and a seal member arranged between a peripheral portion of the filter and an inner wall of the dryer. However, if the filter is downsized with such a device and the overall size is reduced,
The attachment and retention of the sealing material between the filter and the inner wall of the drier becomes poor. In particular, it becomes very difficult to mount it in the correct position during assembly.

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a compressed air drying device that can easily hold a sealing material in a correct position.

[Means for solving problems]

The object is to have an inlet connected to an air compressor, an outlet connected to an air storage tank, a main body having an internal cavity formed in communication with the inlet and the outlet, and one end of the internal cavity. A dryer provided with the other end connected to the outlet at the inlet, a desiccant contained inside the dryer, and a pair of perforated plates arranged on both sides of the desiccant, A filter disposed between the perforated plate and one end of the dryer,
Between a spring that is stretched between the other porous plate and the other end of the dryer and that urges the other porous plate toward the desiccant, and between the peripheral portion of the filter and the inner wall of the dryer. In a compressed air drying device provided with a sealing material arranged in, a ring-shaped collar portion is provided on the outer periphery of the filter, and the sealing material is capable of contacting a groove fitted to this collar portion and the one porous plate. This is achieved by a compressed air drying device having an abutment portion.

[Action]

The groove of the seal material is fitted into the annular collar part on the outer periphery of the filter, and the contact portion of this seal material is brought into contact with one of the perforated plates, so that the seal material is securely held in the correct position relative to the filter. be able to. That is, it can be easily held in the correct position in the dryer both concentrically and vertically. Therefore, the miniaturization of the whole can be surely realized.

〔Example〕

Hereinafter, a compressed air dryer according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, (1) shows the entire compressed air drying device. (2) is a block-shaped base, and (3) is an external case, and the main body is mainly formed by both. The outer case (3) is a tubular body having an open lower end, and an inner container (4) as a dryer made of synthetic resin is concentrically located in the tubular body, and the outer case is attached to the lower end flange portion. After aligning the lower end flange portions of (3), the outer case (3) and the inner container (4) are placed on the base (2), and these flange portions are fixed by bolts or the like not shown. It is fixed. The inner container (4) has a cylindrical shape with an open upper end, and has an upper lid (7) that covers the opening (6), and is placed and fixed on the base (2) as described above, and then the outer case. Although it is arranged in (3), it defines a cylindrical space which becomes a regenerated compressed air storage tank (8) in the outer case (3). The upper lid (7) has a throttle hole (9) and an outlet hole (11) closed by a check valve body (10), and a seal ring (12) is interposed in the opening (6) of the inner container (4). Then, it is fitted over and is fixed with bolts (13). The inner container (4) has a filter (16) at the center of its bottom wall (5).
And a plurality of inlet holes (15) formed around the boss (14) for supporting and fixing the boss (14),
A desiccant (19) is filled in a space above the perforated plate (17) and the filter member (18) which are sequentially placed on the filter (16). The upper surface of the layer of the desiccant (19) is pressed by the spring (22) via the filter member (20) and the perforated plate (21). The spring (22) is interposed between the upper lid (7) and the perforated plate (21) in a compressed state.

The base (2) is formed with a discharge cylinder (36) projecting downward and communicates with the discharge cylinder (36), and the upper surface is the bottom wall (5) of the inner container (4) and the sealing member (37). And a stepped cylindrical space (39) which is closed by interposing a space between the stepped cylindrical space (39) and the inlet hole (15) of the bottom wall (5) of the inner container (4) at the upper end. At the lower end, a vertical passage (41) is formed which is connected to the cylindrical space (39) through the horizontal passage (40) and is connected to an air compression device (not shown). The vertical passage (41) is opened to the inlet passage (25). A plug (43) having a valve hole (42) facing the inner end of the lateral passage (40) is provided in the portion (36) with a retaining ring (44).
It is locked in and tightly fitted. The control piston (46) of the discharge valve (45) is provided in the cylindrical space (39).
And a control chamber A communicating with a control port (not shown) between the control piston (46) and the bottom wall (5) at the pressure receiving portion (46a) at the upper end that slides in the tubular space (39). And a valve member (47) having a tapered seat portion on the outer periphery of the lower end of the valve hole (42) as a valve seat is formed at the lower end of the bolt (48).
The valve member (47) is normally in a position to be seated on the valve seat by being biased upward by the valve spring (49). (50) is a discharge tube, (51) is a retaining ring, and (52) is a seal ring.

Although the inlet passage (25) is connected to the air compressor (not shown) through the pipe (not shown) as described above, the outlet (24) is also connected to the air reservoir (not shown) via the check valve (not shown). Be contacted. Further, the control port monitors the pressure in the air storage tank, and when the internal pressure reaches a first set pressure, a signal pressure (becomes an unload command)
2nd set pressure (lower than the 1st set pressure)
A governor (not shown) which stops the delivery of the signal pressure when the pressure drops to is contacted.

Next, the filter (16) and the sealing material (6
The structure of 6) and related structures will be described.

The filter (16) is mainly composed of an oil filter portion (60), which is supported by a lower filter cover (61), and the lower filter cover (61) has a shape in which a central portion is protruded as shown in FIG. And the bolt (64) through the rubber ring (62) and washer (63) at the center
Is fixed to the boss portion (14) of the bottom wall (5) of the inner container (4). An upper filter cover (65) is worn on the upper portion of the filter (16), and an annular flange portion (65a) protruding outward is formed on the outer peripheral edge portion.

The sealing material (66) is for sealing between the inner container (4) and the filter (16) configured as described above, the details of which are shown in FIGS. 2 to 4. And is composed of an annular seal body (67) mainly made of rubber, and four abutting portions (68) as protruding portions are formed at 90 ° intervals on the upper surface and the lower surface. Further, a groove (69) is formed in the inner peripheral wall portion, which is formed by the filter (1
The size is such that it can be fitted into the collar portion (65a) of the upper filter cover (65) in (6). The seal member (66) is configured as described above, and the contact portion (68) contacts the lower porous plate (17). It has a vertically symmetrical shape.

When assembled, the flange (65) of the upper filter cover (65) of the filter (16) has a groove (69) formed in the inner peripheral wall of the sealing material (66) so as to widen the entire flange (65).
After being fitted in a), it is elastically restored to obtain a combination of the filter (16) and the sealing material (66). This combination is inserted into the bottom wall (5) of the inner container (4) from above, and then fixed to the boss portion (14) of the bottom wall (5) with the bolts (64) as described above. The lower porous plate (17) is brought into contact with the contact portion (68) of the sealing material (66), and the filter member (18) is further directed to the porous plate (17), and the desiccant (19) is placed thereon. Are arranged.

Next, the operation of the apparatus of this embodiment will be described.

In a steady state where the governor does not generate a pressure signal, the compressed air discharged by the air compressor flows through the conduit (not shown) through the inlet passage (25) and the vertical passage (41) to enter the inner container (4). Flows into the inner container (4) through the hole (15),
After being filtered by the filter (16) and the filter member (18), it rises in the layer of the desiccant (19), and during this time moisture etc. is removed to become dry compressed air, which is regenerated from the outlet hole (11). After passing through the compressed air storage tank (8), it flows out from the outlet (24) to the air storage tank.

When the internal pressure of the air tank rises and reaches the first set pressure,
The governor produces signal pressure. This signal pressure is supplied to the unloader device of the air compressor and is introduced into the control chamber A through the control port to start the regeneration cycle. The signal pressure introduced into the control chamber A pushes down the control piston (46) against the spring force of the valve spring (49) to open the discharge valve (45). Release valve (45)
When the valve is opened, the compressed air in the inner container (4) is explosively discharged from the discharge tube (50) together with the drain, and then the dry compressed air in the regenerated compressed air storage tank (8) is squeezed into the throttle hole (9). Back into the inner container (4). Dry compressed air that has flowed back into the internal container (4) flows down the layer of the desiccant (19), regenerates the desiccant (19) during this period, and filters (16), inlet holes (15), vertical passages ( It flows from the exhaust pipe (50) into the atmosphere through the valve hole (42) from the exhaust pipe (41).

When the internal pressure of the air storage tank drops to the second set pressure, the signal pressure from the governor disappears, the air compression device starts loading and discharging compressed air, and the load cycle is started.

Although the embodiment of the present invention has the above-mentioned configuration and operates, the positioning of the sealing material (66) within the inner cylindrical container (4) is easy and is securely held at that position. You can Therefore, the sealing material (66) can be downsized and the entire device can be downsized.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, although the sealing material (66) is made of rubber in the above embodiments, it may be made of another material as long as it has a sealing property, and may be made of synthetic resin, for example. Also,
In the above-described embodiment, the contact portion is the seal body (6
Although it is formed on each of the upper surface and the lower surface in 7), it may be formed on one surface. Further, as shown in the figure, the number of contact portions is not limited to four, and more or two contact portions may be formed.

[Effects of the Invention] As described above, according to the compressed air drying apparatus of the present invention, it is easy to combine the sealing material and the filter,
Further, by bringing the abutting portion of the sealing material into contact with the lower porous plate, the upper and lower positions in the dryer can be accurately positioned, and relative and accurate positioning with respect to the filter can also be performed. The positional relationship can be obtained reliably and accurately, and therefore, the size of the filter and the sealing material can be reduced and the overall size can be easily realized.

[Brief description of drawings]

1 is a sectional view of a compressed air drying apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of a sealing material in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. The drawing is a partially enlarged sectional view in FIG. In the figure, (16) …… Filter (65) …… Upper filter cover (65a) …… Collar (66) …… Seal material (68) …… Contact part (69) …… Groove

Claims (1)

[Scope of utility model registration request] 1. A main body having an inlet connected to an air compressor, an outlet connected to an air storage tank, an internal cavity formed to communicate with the inlet and the outlet, and one end of the internal cavity. A dryer having the inlet connected to the inlet and the other end connected to the outlet, a desiccant housed inside the dryer, and a pair of perforated plates disposed on both sides of the desiccant; A filter disposed between the perforated plate and one end of the dryer,
Between a spring that is stretched between the other porous plate and the other end of the dryer and that urges the other porous plate toward the desiccant, and between the peripheral portion of the filter and the inner wall of the dryer. In a compressed air drying device provided with a sealing material arranged in, a ring-shaped collar portion is provided on the outer periphery of the filter, and the sealing material is capable of contacting a groove fitted to this collar portion and the one porous plate. A compressed air drying device having a contact portion.