JPH08281031A - Compressed air purifying device - Google Patents

Abstract

PURPOSE: To effectively remove oil components while cooling compressed air by forming plural bends in a spiral pass for connecting an inlet to which an air compressor is connected and which is formed into a cylindrical casing with an inflow port which is formed in a cylindrical purifying part body. CONSTITUTION: A compressed air purifying device is provided with a spiral projecting part 91 on the outer periphery of a cylinder part 9a of a drying vessel 9 packed with a drying agent. In case the drying vessel 9 is housed in a body 2, by the spiral projecting part 91, a spiral pass 17 for connecting an inlet 5 of the body 2 and an opening 33a of a baffle 33 is formed. At this time, in the spiral projecting part 91, upper and lower baffle plate parts 92a,..., 93a,... are formed, and by these baffle plates, plural bends 94a,... are formed. In this way, when compressed air is fed into the spiral pass 17, vortexes (a), (a') are generated in the baffle plate parts, and by centrifugal separation action here, oil components in the compressed air are separated and dropped to the back surface of the spiral pass 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air purifying device for use in an air brake system of a vehicle and for separating oil and water in compressed air.

[0002]

2. Description of the Related Art In a braking device that brakes wheels by air pressure, the compressed air discharged from an air compressor is at a high temperature, so that oil is atomized and contained in the compressed air. Has been. If compressed air containing this oil is supplied to the pneumatic equipment side, the pneumatic equipment may not function normally. For this reason, generally, a purifying device such as a filter is provided between the air compression device and the pneumatic equipment, but when purifying the oil component by the filter, the purifying effect does not last for a long time due to clogging of the filter or the like. Therefore, in Japanese Utility Model Laid-Open No. 3-105918, a cylindrical casing having an inlet to which an air compression device is connected is formed above, and a purifying member is housed inside the casing and an inlet is provided below. Disclosed is a compressed air purifying device that includes a tubular purifying section body that is formed, and a spiral passage that is formed in an annular space defined between the casing and the purifying section body and that connects an inlet and an inlet. Has been done.

That is, although FIG. 5 shows a compressed air purifying apparatus 1 ', the compressed air purifying apparatus 1'has a cylindrical casing 2'formed with an inlet 5'to which the air compressing apparatus is connected. In addition, the casing 2'has an annular space
A cylindrical purifying section main body 13 ′ is arranged so as to partition 4 ′ . A filter 3'as a purifying member is housed inside the purifying section main body 13 ', and an inflow port 15' is formed below. In addition, a spiral passage 17 ' that connects the inlet 5'and the inlet 15 ' is formed in the annular space 4 ' . By providing the spiral passage 17' , the inlet 1 '
The compressed air is cooled by taking a long flow path of the compressed air up to 5 ', and the oil component of the compressed air is dropped.
Further, in order to enhance the cooling efficiency of the compressed air, a plurality of cooling fins 80 'are formed on the outer circumference of the casing.

However, since the fins 80 'for cooling are formed in order to cool and remove oil, there is a problem that the manufacturing cost increases. Furthermore, the dropping effect by cooling does not sufficiently remove the oil content, so the purification effect does not last for a long time. In particular, when the compressed air purifying device is installed in a recessed place of a vehicle or the like, there is a problem that cooling efficiency is lowered and oil cannot be sufficiently removed.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and provides a compressed air purification apparatus capable of efficiently removing oil while cooling compressed air and reducing manufacturing costs. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION The above object is to provide a tubular casing having an inlet to which an air compressor is connected, and a purifying member housed in the casing. A tubular purifying section main body having an inlet formed therein, and a spiral passage formed in an annular space defined between the casing and the purifying section main body, the spiral passage connecting the inlet and the inlet. In the compressed air purification device,
This is achieved by a compressed air purification device having a plurality of bends formed in the spiral passage.

[0007]

Since the bent portion is provided in the spiral passage, the compressed air collides with the bent portion to generate a small vortex (which causes the centrifugal action of the compressed air), and the oil can be removed. That is, since the oil content in the compressed air can be removed by the centrifugal separation action of the bent portion provided in the spiral passage, it is not necessary to provide the cooling fin for improving the cooling effect. Further, since the bent portion is formed in the spiral passage, many bent portions can be formed in a small space, oil can be efficiently removed, and the device itself does not become large. Further, since the spiral passage is provided on the inlet side of the purifying member, the oil content flowing into the purifying member is reduced, and the purifying effect of the purifying member can be maintained for a long time.

[0008]

Embodiments of the compressed air purifying apparatus of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional front view of the compressed air purifying apparatus of the present invention. In FIG. 2, reference numeral 1 shows the entire compressed air purifying apparatus. A cylindrical drying container 9 having a chamber 42 formed therein is disposed in a cylindrical main body 2 having an opening above the compressed air purifying device 1. The outer peripheral surface of the drying container 9 and the main body 2 are arranged. An annular space 4 is defined between the inner peripheral surface and the inner peripheral surface. The chamber 42 is filled with a desiccant 41 which is one of the purification members. A flange portion 2a is formed on the outer periphery of the opening of the main body 2, and an inlet 5 that connects an air compressor (not shown) and the annular space 4 is formed in the flange portion 2a. On the other hand, a drain valve body 7 of the drain valve portion 6 is integrally formed on the lower portion of the body 2.

In the drain valve section 6, the drain valve body 7
There is a hole 53 therein, which on the one hand communicates with the control port 52 via a passage 54 and on the other hand with the annular cavity 4 via a recess 55. A plug 60 is inserted in the hole 53, and a lateral passage 59 communicating with the recess 55 and a stepped hole 56 communicating with the outside air are formed inside the plug 60. Further, in the stepped hole 56. A control piston 58 is slidably arranged.
The chamber 50 in the hole 53 defined by the plug 60 and the control piston 58 communicates with the control port 52 via the passage 54. A valve member 61 made of an elastic material is fixed to the lower end of the control piston 58 with a bolt 63.
6 cooperates with the exhaust valve seat 66 formed on the stepped portion 6 to control the communication between the annular space 4 of the main body 2 and the outside air. The valve spring 6
Reference numeral 7 is a spring that biases the control piston 58 upward, and the plug 60 is retained by a retaining ring 69 via a discharge cylinder member 68.

A regeneration tank 10 is arranged on the upper portion of the main body 2 so as to cover the opening side. The regeneration tank 10 is a thin cup-shaped member, and has a flange portion 10a on the opening side.
The flange portion 10a is aligned with the flange portion 9b of the drying container 9 and the flange portion 2a of the main body 2 and integrated with each other by a plurality of bolts 12. Further, inside the regeneration tank 10, a cavity 14 for securing the dry air for regenerating the desiccant 41 is defined, and further to the side, an outlet for communicating the cavity 14 with an air tank (not shown). Have 11.

The drying container 9 has an inner hole 9 having an opening at the top.
It is a cylindrical body having d . At the bottom of the drying container 9, a filter 27, which is another purifying member and includes an outer filter 27a and an inner filter 27b, is arranged.
The outer filter 27a and the inner filter 27b are integrally fixed by attaching the lower filter cover 32 covering the lower surface thereof to the outer central protrusion 26b formed on the bottom of the drying container 9 with the bolt 25, and further on the bottom of the drying container 9. Positioning in the radial direction is performed by the integrally formed ring-shaped protrusion 9e. An upper filter cover 31 covering the outer periphery of the seal member 36 and the outer filter 27a is held between the outer filter 27a and the bottom surface of the drying container 9, and the upper filter cover 31 has an opening 33a serving as an inflow port. The baffle 33 is locked. In addition, the filter cloths 43, 44 are provided in the inner hole 9d of the drying container 9.
And a pair of upper and lower partition plates 39, 40 composed of perforated plates 45, 46 having a large number of holes are slidably fitted to the side surface of the inner hole 9d, and a chamber 42 is defined between them. The chamber 42 is filled with the desiccant 41. The lower perforated plate 46 has a central portion which is the inner central protruding portion 26 of the drying container 9.
At a, the peripheral portion is supported by a ring-shaped support member 47, and a diffusion chamber 48 is defined between the diffusion chamber 48 and the bottom surface of the inner hole 9d so that the compressed air spreads and passes through the desiccant 41. A plurality of holes 24 through which compressed air can flow from the annular space 4 through the filter 27 into the inner hole 9d are provided at the center of the bottom surface of the drying container 9.

The opening of the drying container 9 has an inner hole of the drying container 9.
The lid member 16 that covers 9d is fixed by a plurality of bolts 18. This lid member 16 has an aperture 2 inside.
0 and an outlet 22 closed by a check valve 21. Further, the spring 19 is interposed between the lid member 16 and the upper partition plate 45, and when the lid member 16 is fixed to the drying container 9, the desiccant 41 is compressed through the upper partition plate 39. To do.

Next, the spiral passage 17 according to the present invention will be described in detail.

FIG. 3 is a sectional plan view taken along line [3]-[3] in FIG. Further, FIG. 1 shows a spiral passage formed outside the drying container 9 by removing the back surface of the main body 2.
FIG. 4 is a view showing a back surface shape of the body 17 , and similarly FIG. 4 is a view showing a front surface shape of the spiral passage 17 formed outside the drying container 9 by removing the front part of the main body 2. That is, in FIG. 1 and FIG. 4, only the main body 2 and the regeneration tank have a cross section.

The drying container 9 is a cylindrical member as described above, but as shown in FIGS. 1 and 4, a spiral protrusion formed in a spiral shape is formed on the outer periphery of the cylindrical portion 9a of the drying container 9. Part 91
Is provided. The spiral protrusion 91, when the drying vessel 9 is inserted into the annular space 4 of the body 2, in the annular space 4, spirally to contact the opening 33a of the inlet 5 and the baffle 33 body 2 The passage 17 is formed. Further, in the spiral protrusion 91, upper baffle plates 92a, 92b, ..., 92h formed from the upper side to the lower side in the spiral passage 17 are formed.
, And 94h formed by the lower baffle plates 93a, 93b, ..., 93h formed from the lower side to the upper side in the spiral passage 17 are provided in plural. These are shown in the center of FIGS. 1 and 4. Further, as shown in FIG. 3, the spiral protrusion 9
1, a plurality of projecting portions 95a, 95b, ..., 95h projecting in the radial direction of the drying container 9 in the spiral passage 17 are formed. That is, in this embodiment, the bent portions 94a, 94
94h and protrusions 95a, 95b, ...
95h are formed alternately. Further, on the upstream side of the lower baffle plates 93a, 93b, ..., 93h, that is,
On the inlet 5 side, the respective lower baffle plates 93a, 93
b, · · ·, hole communicating the passage adjacent the lower portion of the helical passage 17 93h are formed 96a, 96b, · ·
., 96h are formed.

The compressed air purifying apparatus 1 according to the present invention is constructed as described above. Next, the operation of this apparatus will be described.

When an air compression / drying device (not shown) is driven, compressed air is supplied to the spiral passage 17 through the inlet 5 of the main body 2 of the compressed air purifying device 1 as shown in FIG. The compressed air supplied to the spiral passage 17 is initially the upper baffle plate portion 92a and the lower baffle plate portion 93 of the bent portion 94a.
Colliding with a causes a flow as shown by arrow A in FIG. Therefore, the upper baffle plate portion 92a and the lower baffle plate portion 93a side have a negative pressure, and small vortices a and a'are generated there. The vortexes a and a ′ generate a centrifugal action, the oil in the compressed air is separated, and drops on the lower surface of the spiral passage 17 . The dripping oil is collected in the lower baffle plate 93
through hole 96a formed on the inlet side of a, helical passage 17 adjacent to its lower, i.e. is dropped in a spiral path 17 the bent portion 94c is formed in FIG.

The compressed air from which the oil content has been removed as described above by passing through the bent portion 94a is next projected.
Although it passes through a, the compressed air causes a flow as shown by an arrow B in FIG. 3, and the centrifugal action acts similarly to the bent portion 94a, and the oil component in the compressed air is dropped on the lower surface of the spiral passage 17. . Since the lower surface of the spiral passage 17 is inclined, the dropped oil is conveyed smoothly to the hole 96b, the through hole 9
6b to the spiral passage 17 adjacent therebelow, that is, the spiral passage in which the bent portion 94d is formed in FIG.
It is dripped at 17 .

Thereafter, the compressed air is further passed through the spiral passage 17
Bent portion 94b provided inside, protruding portion 95b, bent portion 9
4c, protrusion 95c, ..., bent portion 94h, protrusion 9
5h in sequence and descends in the spiral passage 17 , but the bent portions 94b, 94c, ...
In 95c, ..., 95h, the same action as that of the above-mentioned protruding portion 95a is performed. Also, the bent portions 94b, 94c, ...
.., 94h and protruding portions 95b, 95c, ..., 95h
Oil in the compressed air separated by collision with the spiral passage
17 through the lower surface of the through hole 96a , 96b , ..., 9
6h , the through holes 96a , 96b , ..., 9
The lower through holes 96c , 96d , which are adjacent to each other through 6h , ...
-, it is added dropwise to 96h, final hole 96g and the through hole 9
It is dripped into the recess 55 at the bottom of the main body 2 through 6h .

The compressed air passing through the spiral passage 17 is
Although passing through the opening 33a of the baffle 33, as shown in FIG. 2, after passing through the opening 33a, the filter 27 for further removing oil, the hole 24 of the drying container 9, the diffusion chamber 48 , and the lower partition plate 46 are installed. It is supplied to the desiccant 41 that adsorbs moisture, becomes dry compressed air, passes through the outlet hole 22, opens the check valve 21, and is supplied from the outlet 11 of the regeneration tank 10 to the above air tank for storage.

When the air pressure in the air tank reaches the first set pressure, a governor (not shown) generates a control pressure as an unload air pressure signal, and supplies this pressure to the control port 52 of the drain valve section 6. The signal pressure from the governor supplied to the control port 52 is introduced into the chamber 50 through the passage 54 and pushes down the control piston 58 against the spring force of the valve spring 67. As the control piston 58 lowers, the valve member 6
1 is separated from the exhaust valve seat 66 and opened, and the annular space 4 of the main body 2 communicates with the atmosphere via the recess 55 and the lateral passage 59. As a result, the dry compressed air stored in the empty space 14 of the regeneration tank 10 flows back through the throttle hole 20 into the chamber 42 of the drying container 9 to regenerate the desiccant 41, and further the filter 27, It is discharged to the outside air through the recess 55 and the lateral passage 59. At this time, the bent portions 94a, 94b, ..., 94h formed in the spiral passage 17 and the protruding portions 95a, 95
.., 95h, the filter 27, the lower filter cover 32, the baffle 33, and the like, the oil droplets and water droplets are dropped into the recess 55 at the bottom of the main body 2 as described above. Along with the valve, it is smoothly discharged to the outside.

When the internal pressure of the air tank drops to the second set pressure, the signal pressure from the governor stops, and the signal pressure at the control port 52 becomes zero. Then, the control piston 58 causes the valve spring 67 that has been compressed.
Is pushed up, the valve member 61 is seated on the discharge valve seat 66, and the communication between the inside of the main body 2 and the atmosphere is cut off. Then, the air tank is driven to start discharging compressed air. Thereafter, by repeating the above series of operations, dry compressed air whose pressure is adjusted to a predetermined pressure range is constantly stored in the air tank.

The above, according to an embodiment of the present invention as described, the bent portion 94a in the spiral passage 17, 94b, · ·
.., 94h and protruding portions 95a, 95b, ..., 95h
, A plurality of bent portions 94a, 94b, ..., 94
Since h and the protruding portions 95a, 95b, ..., 95h are provided alternately, the oil can be efficiently removed even in a small space. Therefore, it is not necessary to form the fins for cooling, and the manufacturing cost can be reduced.

Further, according to this embodiment, the bent portion 94a,
94b, ..., 94h lower baffle plate portions 93a, 93
b, ..., 93h on the inlet side, through holes 96a , 96b , ...
..... Since 96h are provided, the bent portions 94a, 94
b, ..., 94h upper baffle plate portions 92a, 92b, ...
..., 92h and protruding portions 95a, 95b, ..., 95
The oil removed by h smoothly flows through the spiral passage 1
7 through the lower surface of the through hole 96a , 96b , ..., 96
It is carried to h and no oil remains in the spiral passage 17 . Further, even in oil removed above the spiral passage 17, through holes 96a, 96b, · · ·, it is possible to go transmitted to the bottom of the annular space 4 of the body 2 via 96h, oil and water droplets Is not hindered from being released into the atmosphere.

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, in the present invention, the bent portion and the protruding portion are provided alternately, but in order to facilitate the processing, only the bent portion or only the protruding portion may be provided in the spiral passage 17 .

Further, although the cooling fins are not provided in this embodiment, a bent portion or a protruding portion may be provided in the spiral passage of the conventional compressed air purifying apparatus shown in FIG. 5, which has cooling fins. Good.

[0029]

As described above, according to the compressed air purifying apparatus of the present invention, the compressed air collides with the bent portion to generate the vortex having the centrifugal separation effect. Therefore, the cooling fin is not required. Therefore, oil can be efficiently removed. Further, since the bent portion is formed in the spiral passage, the passage can be long and many bent portions can be formed, so that the oil can be efficiently removed in a small space. Therefore, the manufacturing cost can be reduced and the purifying effect of the filter can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part of a rear surface of an external shape of a spiral passage of a compressed air purification device according to an embodiment of the present invention.

FIG. 2 is a sectional front view of a compressed air purifying apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram of a compressed air purification device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional plan view in the [3]-[3] line direction in FIG.

FIG. 4 is a partial cross-sectional view showing a main part of the front surface of the external shape of the spiral passage of the compressed air purification device according to the embodiment of the present invention.

FIG. 5 is a sectional front view of a compressed air purifying device in a conventional example.

[Explanation of symbols]

1 Compressed Air Purifying Device 2 Main Body 4 Annular Space 5 Inlet 9 Drying Container 17 Spiral Passage 33 Baffle 33a Opening 41 Desiccant 58 Control Piston 60 Plug 61 Valve Member 91 Spiral Protrusion 92a Upper Baffle Plate 93a Lower Baffle Plate Portion 94a bent portion 95a protruding portion 96a through hole

Claims (6)

[Claims] 1. A cylindrical casing in which an inlet to which an air compression device is connected is formed above, and a cylindrical purification in which a purifying member is housed inside the casing and an inflow port is formed below In the compressed air purifying device, the compressed air purifying device comprises: a main body of a portion; and a spiral passage formed in an annular space defined between the casing and the main body of the purifying portion, the spiral passage connecting the inlet and the inlet. A compressed air purification device having a plurality of bent portions formed in a passage. 2. The compressed air purifying apparatus according to claim 1, wherein the bent portion is a baffle plate formed so as to cross the inside of the spiral passage. 3. The baffle plate is a first baffle plate formed from the upper side to the lower side of the spiral passage, and a second baffle plate is formed from the lower side to the upper side of the spiral passage. The compressed air purification apparatus according to claim 2, wherein one of the bent portions is formed by the first and second baffle plates. 4. The compressed air purifying apparatus according to claim 1, wherein the bent portion is a protruding portion that protrudes in the radial direction of the purifying portion main body within the spiral passage. 5. A baffle plate portion in which the bent portion has a first baffle plate formed from the upper side to the lower side in the spiral passage and a second baffle plate formed from the lower side to the upper side in the spiral passage. Alternatively, the compressed air purifying apparatus according to claim 1, wherein the baffle plate and the protrusions are formed alternately, and the protrusions are formed to protrude in the radial direction in the spiral passage. 6. A passage for connecting the spiral passage in which the second baffle is formed and a spiral passage adjacent to the lower side of the spiral passage on the inlet side of the second baffle. The compressed air purification device according to claim 3 or 5, wherein holes are formed.