JPH0247252B2 - EAADORAIASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air dryer device used for drying compressed air.

In a pneumatic system, if condensed water is contained in the compressed air discharged from a compressor, rust will occur in each device in the system, leading to deterioration of the devices and causing problems such as reduced functionality. In particular, if condensed water is contained in the compressed air in a vehicle's air brake system, this condensed water will freeze inside each device in cold weather, and as a result, each device will become inoperable and the vehicle will not be able to brake. There is a risk.

Therefore, conventionally, for example, a main body having a compressed air inlet and a compressed air outlet, a drying cylinder housed in the main body and filled with a desiccant, and a compressed air inflow side of the drying cylinder within the main body. A filter member connected to the filter member and a control chamber provided on the compressed air inflow side of the filter member and normally communicating with a pressure release source to close the valve, and this control chamber receives a valve opening pneumatic pressure signal. In some cases, an air dryer device equipped with a drain valve that opens to communicate the inside of the main body with outside air is installed in the pneumatic system connecting the compressor and the main tank, and the compressed air discharged from the compressor is used as a desiccant. The water is then dried and sent to the main tank.

However, in the above air dryer, the filter member may become clogged with oil and dust in the compressed air after long-term use.
Furthermore, due to long-term use, the desiccant in the drying cylinder changes from granular to partially powdery due to wear, which makes it easier to absorb moisture. Therefore, in winter, the desiccant may freeze and become impervious to compressed air.

As mentioned above, if the air compressor is operated with the filter member clogged or the desiccant frozen, the filter member in the main body of the air dryer will be damaged in the passage on the compressed air inlet side. The pressure of compressed air suddenly increases and becomes abnormally high. For this reason, not only is a large load placed on the air compressor, but there is also a risk that the main body may be damaged.

Conventionally, in order to prevent the compressed air pressure in the passage on the compressed air inlet side of the filter member in the main body from becoming abnormally high due to the filter member becoming clogged or the desiccant freezing, A safety valve was installed in a hole in the wall of the main body. As a result, when the pressure of the compressed air in the passage becomes abnormally high, the safety valve opens and the compressed air is discharged from the passage to the outside. This prevents the main body from being damaged and heavy loads from being applied to the air compressor, but since the safety valve is provided on the outer wall of the main body, the external dimensions of the entire device are correspondingly large, and it is difficult to assemble. It is also conceivable that it will become a nuisance during the subsequent installation work of the device on the vehicle body, or that it will collide with other equipment and be damaged.

The present invention has been made in view of the above points, and has an extremely compact structure that prevents the filter member from clogging, the main body from being ruptured even if the desiccant freezes, and the air compressor from being subjected to a large load. It is an object of the present invention to provide an air dryer device that can prevent such problems. According to the first aspect of the present invention, this object includes: a main body having a compressed air inlet and a compressed air outlet; a drying tube housed in the main body and filled with a desiccant; It is equipped with a filter member connected to the compressed air inflow side of the cylinder, and a control chamber provided on the compressed air inflow side of the filter member and normally communicating with a pressure release source.The valve is closed when the control chamber is opened. In an air dryer device comprising a drain valve that opens to communicate the inside of the main body with outside air when receiving a valve air pressure signal, the valve main body of the drain valve has a compressed air inlet of the main body and the control chamber. an air dryer device, characterized in that the passage is provided with a check valve that opens at a predetermined differential pressure and whose forward direction is from the compressed air inlet to the control chamber. , achieved by. According to a second aspect of the present invention, there is provided a main body having a compressed air inlet and a compressed air outlet, a drying cylinder housed in the main body and filled with a desiccant, and a drying cylinder filled with a desiccant in the main body. A filter member connected to the compressed air inlet side and a control chamber provided on the compressed air inlet side of the filter member and normally communicating with a pressure release source are closed. In an air dryer device comprising a drain valve that opens to communicate the inside of the main body with outside air when a signal is received, the control piston is fixed to one end of the control piston of the drain valve, and the control piston is fixed to one end side of the control piston of the drain valve, and the drain valve opens to communicate the inside of the main body with outside air. The pressure receiving area of the valve member that opens and closes between the passage on the inlet side and the outside air, which receives the compressed air pressure from the passage on the compressed air inlet side in the main body, is defined as the area on the other end side of the control piston. The valve member is configured to be larger by a predetermined value than the pressure receiving area that receives compressed air pressure from the passage on the compressed air inlet side of the main body, and the valve member is normally in a closed position by the valve spring of the drain valve. This is achieved by an air dryer device characterized by:

Hereinafter, details of the present invention will be explained based on examples. The figure is a sectional view including the piping system of the air dryer device according to the embodiment of the present invention, and the main body 2 of the air dryer device, generally indicated by 1 in the figure, is formed with an inner hole 4 having an opening 3 at the top. A compressed air inlet 5 communicating with the inner hole 4 is provided on the upper side periphery of the main body 2 . At the bottom of the main body 2, a drain valve main body 7 of the drain valve 6 is integrally formed with the main body 2. On the other hand, a lid member 8 covering the inner hole 4 of the main body 2 is attached to the upper part of the main body 2 by fitting the fitting protrusion 9 into the opening 3. An outer seal ring 10 attached to the fitting protrusion 9 maintains airtightness between the inside of the inner hole 4 and the atmosphere. The lid member 8 and the main body 2 are integrally fixed to each other by a plurality of bolts 12 at their flange portions.

A boss portion 13 is formed in the center of the upper surface of the lid member 8, and the boss portion 13 has a pipe connection port 15 having a passage 14 therein communicating with the inside of the main body 2.
is provided. A valve seat 18 is formed in the passage 14, and a ball valve member 19 that can be seated on the valve seat 18 is arranged. This constitutes a check valve 20 that allows only a certain amount of air to flow.
Further, the passage 14 is provided with a throttle passage 21 that bypasses the check valve 20 and constantly communicates the inside of the main body 2 with the connection port 15. Piping connection port 15
The stop plate 11, which is press-fitted into the pilot hole of the pipe thread 61 formed in FIG.

The above-mentioned pipe connection port 15 is connected to the regeneration tank 17 via the pipe line 16, while the inlet port 5 is connected to the pipe line 22.
The outlet of the regeneration tank 17 is connected to the main tank 27 through a conduit 25 and a check valve 26. Governor 28 connected to main tank 27
For example, set the air pressure in the main tank 27 to 7 to 8 kg/
This governor is connected to an unloader 30 provided in ^the compressor 23 through a line 29, and is connected to a control port 32 of the drain valve 6 through a line 31. It is connected to the. It is assumed that various devices are further connected to the main tank 27 even if not shown.

A drying cylinder 34 that is inserted into the inner hole 4 from the opening 3 of the main body 2 and whose upper outer periphery fits into the recess 33 of the lid member 8.
A plurality of openings are formed at the bottom, a plurality of protrusions 35 are formed on the inner surface, and a positioning protrusion 36 is formed at the center of the outer surface of the bottom. The positioning protrusion 36 of the drying cylinder 34 is located in a hole 38 formed in the boss portion 37 of the drain valve body 7.
It is positioned relative to the main body 2 by being fitted into the main body 2. Inside the drying cylinder 34, there is a pair of upper and lower partition walls 3.
9 and 40 are slidably fitted to the inner circumferential side of the drying tube 34, and define a chamber 47 between which a desiccant 48 is filled.

The upper and lower partition walls 39 and 40 each consist of a filter cloth 41, a partition plate 42 having a large number of holes, and a clamping band 43 for clamping these.
The clamping band 43 is made of rubber, and integrally has a pair of flange parts projecting in the inner diameter direction and an outer flange part protruding in the outer diameter direction on the same plane as the upper or lower flange part. The filter cloth 41 is superimposed on the partition plate 42, and their peripheral edges are elastically clamped by a pair of inner flanges of a clamping band 43. The lower or upper inner flange portion is formed to be slightly thicker than the upper or lower inner flange portion, and the tip of the upper or lower inner flange portion is slightly bulged downward. Partition plate 4
The peripheral edge of the filter cloth 41 is received by the lower or upper inner flange, and the peripheral edge of the filter cloth 41 superimposed on the partition plate 42 is pressed by the tip of the upper or lower inner flange. As a result, the partition plate 42 and the filter cloth 41 are fixed to each other.

When the air dryer device 1 is assembled, the lower partition wall 40 configured as described above is provided with a filter cloth 4.
1 is placed upward, but at this time, the outer flange portion of the clamping band 43 is bent upward along the inner surface of the drying tube 34, and in this state, the partition wall 40 is inserted downward. It is slid and received by the protrusion 35 at the bottom of the drying cylinder 34. Next, a predetermined amount of desiccant 48 is filled into the drying tube 34, and then the upper partition wall 39 consisting of the filter cloth 41 and the partition plate 42 is inserted into the drying tube 34 with the filter cloth 41 facing downward.

The drying tube 34 filled with the desiccant 48 as described above is inserted into the main body 2, and the positioning protrusion 36 is fitted into the hole 38 of the boss portion 37, so that the drying tube 34 is positioned with respect to the main body 2. When the spring 49 is interposed between the upper partition wall 39 and the lid member 8, and the lid member 8 is fixed to the main body 2 with the bolts 12, the desiccant 48 in the chamber 47 of the drying tube 34 passes through the upper partition wall 39. and placed in a compressed state. In addition,
A seal ring 59 is interposed between the upper end of the drying cylinder 34 and the lid member 8.

The filter section 50 located below the drying tube 34 is incorporated into the main body 2 before the drying tube 34, and this filter section 50 will be explained next.

The filter section 50 consists of an annular upper holding member 52, a cone-shaped lower holding member 53, and an annular oil filter 54 held by these.
A filter portion 50 is disposed within the main body 2 so as to be aligned with the hole 38 of
A sealing member 51 is interposed between the drying tube 34 and the filter section 50.

The sealing member 51 is made of rubber, has a substantially annular shape, and has a peripheral wall portion and a pair of ring-shaped protrusions integrally formed. The lower surface of the sealing member has a shape that almost matches the outer surface shape of the upper peripheral edge of the upper holding member 52 of the filter section 50, and when the sealing member 51 is set on the upper holding member 52, the outer surface of the upper peripheral edge of the sealing member 51 is 55 is engaged with the peripheral edge of the upper retaining member 52, whereby the sealing member 51 is engaged with the peripheral edge of the upper retaining member 52.
2, that is, positioned relative to the filter section 50. Next, as described above, the drying cylinder 34 is attached to the main body 2.
the cover member 8 is inserted into the main body 2 via the spring 49.
When the bolts 12 are fixed to are crushed, thereby ensuring the sealing effect of the main member 51. A passage 62 formed by the main body 2 and the drying tube 34 communicates with the inlet 5 on the one hand;
On the other hand, the oil filter 54, the chamber 47, the spring 49
It communicates with a regeneration tank 17 via a passage 14 having a storage chamber check valve 20 and a throttle passage 21, a pipe connection port 15, and a pipe line 16.

On the other hand, the drain valve 6 has a hole 63 in the drain valve body 7, and the hole 63 has a passage 6 on the one hand.
4 to the control port 32, and on the other hand, it communicates to the inside of the main body 2 via a passage 65. The plug 60 inserted into the hole 63 has a hole 66 and a hole 67 formed therein, and a control piston 68 is slidably disposed within the hole 66 . A discharge valve seat 69 is formed in the upper part of the hole 67.
The lower part is open to the atmosphere. Hole 63 defined by plug 60 and control piston 68
Inner chamber 70 communicates with control port 32 via passageway 64 . control piston 6
A valve member 71 made of an elastic material is fixed to the lower end of the valve member 8 with a bolt 73 via a stopper 72.
The valve member 71 cooperates with the discharge valve seat 69 to control communication between the inside of the main body 2 and the atmosphere. A chamber 74 in the bore 66 formed by the control piston 68 communicates with the passage 65 by a cutout passage 75 and a passage 76 . A spring 77 tensioned within the chamber 74 always urges the control piston 68 upward. The plug 60 is prevented from coming off via a discharge pipe 78 by a retaining ring 79. 80, 81 and 82 are seal rings.

According to the present invention, there is further provided a hole 9 in the upper wall portion of the drain valve main body 7 that communicates with the positioning hole 38 of the drying tube 34 and the control 70 of the drain valve 6.
0 is formed, and the positioning hole 38 and the main body 2
A groove 96 is formed in communication with the passage 62 . A check valve 91 that opens and closes the hole 90 is disposed within the control port chamber 70 of the drain valve 6. That is, the valve body 9 of this check valve 91
A spring receiving ring 94 is fixed to the circumferential side of the valve 2, and a valve spring 93 is stretched between the ring 94 and the upper edge of the plug 60. The valve body 92 is urged upward by the valve spring 93, and a ring-shaped protrusion 95 formed on the upper surface of the valve body 92 normally pushes against the upper wall portion of the boss portion 37 around the hole 90. It is in contact with. Therefore, the direction from the passage 62 side toward the control chamber 70 is defined as the forward direction, and the valve is normally closed as shown. This check valve 91 is configured to open against a valve spring 93 when the pressure on the passage 62 side becomes higher than the pressure on the chamber 70 side by a predetermined value or more. That is, the predetermined value as the valve opening pressure is determined by the pressure within the main body 2 that is considered abnormal.

The air dryer device according to this embodiment is constructed as described above, and the normal operation of this device will be explained below.

When the compressor 23 is operated under load, the discharge port 2
The moist compressed air sent out from 4 is supplied to the inlet 5 through the conduit 22. This compressed air further passes through the passage 62 and the oil filter 54 to the chamber 47.
Here, the air is dried in the drying cylinder 48, becomes dry compressed air, and is stored in the regeneration tank 17 by opening the check valve 20, passing through the passage 14 and the piping connection port 15. This dry compressed air is further stored in the main tank 27 from the outlet of the regeneration tank through a line 25 and a check valve 26. Main tank 27
The dry compressed air stored within is supplied to various devices (not shown) in the air brake system, for example, as indicated by arrows.

When the air pressure in the main tank 27 reaches a predetermined value, for example 8 kg/cm ² , the governor 28 supplies an unload air pressure signal to the unloader 30 to put the compressor 23 into no-load operation, and also sends this air pressure signal to the drain valve. 6 control port 32. The signal pressure from the governor 28 supplied to the control port 32 is introduced into the chamber 70, and this air pressure acts on the control piston 68, causing the control piston 68 to spring 77.
Compress and move it down the diagram. As the control piston 68 moves downward, the valve member 7
1 is removed from the discharge valve seat 69, the interior of the main body 2 is communicated with the atmosphere through the passage 65 and the passage 76. Then, the dry compressed air in the regeneration tank 17 passes through the pipe connection port 15 and the throttle passage 21 and enters the chamber 4.
The condensed water that is returned to the desiccant 7 and adhered to the surface of the desiccant 48 is discharged to the atmosphere through the filter 54, the passage 65, and the passage 76, and the desiccant 48 is regenerated.

The compressed air in the main tank 27 is consumed by each device connected to the main tank 27, and the main tank 2
When the air pressure in the compressor 7 falls below the above-mentioned specified lower limit pressure of 7 kg/cm ² , the governor 28 stops sending the no-load operation drive air pressure signal to the unloader 30 and gives a signal to the compressor 23 to start the load operation again. That is, the signal pressure supplied to the drain valve 6 is released to the atmosphere to bring the air pressure inside the pipe line 31 to zero. Then, the control piston 68 is pressed by the spring 77 and moves upward in the figure, and the valve member 71 seats on the discharge valve seat 69, cutting off communication between the inside of the main body 2 and the atmosphere. Thereafter, by repeating the above series of operations, dry compressed air whose pressure is regulated within a predetermined pressure range is constantly stored in the main tank 27.

Normally, the operation is as described above, but next, a case will be described in which the filter section 50 is clogged with oil or dust, but the desiccant 48 is frozen.

When the air compressor 23 is operated in such a case, the compressed air from the inlet 5 is guided into the passage 62 but has nowhere to go, and the compressed air in the passage on the compressed air inlet side with respect to the passage 62 or the filter section 50 is Pressure is rising. However, according to this embodiment, since the check valve 91 is disposed between the passage 62 on the inlet side and the control chamber 70 of the drain valve 6, the differential pressure between them does not reach this valve opening pressure. Then, the check valve 91 opens and the compressed air in the passage 62 flows into the groove 9 formed in the drain valve body 7.
6, is led to the control chamber 70 through the holes 38 and 90. At this time, since the control room 70 is in communication with the atmosphere via the control port 32, the pipe line 31, and the governor 28, the control room 70
The compressed air guided to zero is discharged to the outside.

Therefore, even if the filter section 50 becomes clogged or the desiccant 48 in the drying tube 34 freezes, causing the pressure inside the passage 62 to become abnormally high, the air compressor 23 will not be overloaded, and the main body 2 There is no need to break anything. Incidentally, clogging of the filter section 50 can be eliminated by periodic inspection or replacement. Further, when the desiccant 48 is used for a long period of time, the powder component increases and absorbs moisture easily, which may cause freezing in winter. Therefore, a frozen state can be avoided by periodically inspecting or replacing the desiccant 48. Furthermore, even if the drain valve is used while frozen, a heater is generally provided near the drain valve main body 7 to prevent the drain valve from freezing. Due to the heat, the lyophilizer 48 will eventually thaw and resume normal operation.

Although the embodiment of the present invention has been described above, in other embodiments of the present invention, the hole 90, groove 96, and check valve 91 formed in the boss portion 37 of the drain valve body 7 described above are omitted. That is, control room 7
0 is always kept out of communication with the inside of the main body 2, but the pressure receiving area of the valve member 71 received from the inside of the main body 2 is larger by a predetermined value than the pressure receiving area (ring shape) of the control piston 68 received from the inside of the main body 2. configured. That is, normally the control piston 68 is urged upward by the valve spring 77 and the drain valve 6 is in the closed position, but the filter section 5
0 becomes clogged or the desiccant 48 freezes, and the pressure on the compressed air inlet side in the main body 2 becomes abnormally high. - The piston 68 moves downward, the valve member 71 is separated from the valve seat 69, and the inside of the main body 2 is configured to communicate with the outside air. The other configurations and operations are completely the same as those of the above-mentioned embodiment.

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

For example, the structure of the drain valve 6 in which the check valve 91 is disposed is not limited to that shown in the drawings;
1, various structures can be applied.
For example, a fitting type valve material made of rubber may be fitted into the hole 90.

As described above, the air dryer device of the present invention has a passage formed in the valve body of the drain valve that communicates the compressed air inlet of the device body with the control chamber of the drain valve, and connects the compressed air inlet to the control chamber. A check valve is provided that opens at a predetermined differential pressure with the direction facing the drain valve as the forward direction, or is fixed to one end side of the control piston of the drain valve and is connected to the passage on the compressed air inlet side in the main body. The pressure-receiving area of the valve member that opens and closes the connection with the outside air, which receives compressed air pressure from the passage on the compressed air inlet side in the main body, is defined as The structure is configured to be larger by a predetermined value than the pressure receiving area that receives compressed air pressure from the passage on the inlet side, and the valve member is normally placed in the closed position by the valve spring of the drain valve, resulting in an extremely compact structure. This makes it possible to prevent the main body from being damaged and the air compressor from being overloaded, which would otherwise occur if the filter part became clogged or the desiccant froze.

[Brief explanation of drawings]

The drawing is a sectional view including a piping system of an air dryer device according to an embodiment of the present invention. In the figure, 1... air dryer device,
2...Main body, 5...Inflow port, 6...Drain valve,
7... Drain valve body, 14, 62, 64... Passage, 32... Control port, 34... Drying cylinder, 47... Chamber, 48... Desiccant, 50... Filter section, 70... Control room , 90...hole,
91...Check valve, 96...Groove.

Claims (1)

[Scope of Claims] 1. A main body having a compressed air inlet and a compressed air outlet, a drying tube housed in the main body and filled with a desiccant, and a compressed air inflow side of the drying tube inside the main body. A filter member connected to the filter member and a control chamber provided on the compressed air inflow side of the filter member and normally communicating with a pressure release source to close the valve, and this control chamber receives a valve opening pneumatic pressure signal. In an air dryer device comprising a drain valve that opens to communicate the interior of the main body with outside air, the valve main body of the drain valve is provided with a passage that communicates the compressed air inlet of the main body with the control chamber. 1. An air dryer device, characterized in that the passage is provided with a check valve that opens at a predetermined differential pressure, with the direction from the compressed air inlet toward the control chamber as the forward direction. 2. A main body including a compressed air inlet and a compressed air outlet, a drying cylinder housed in the main body and filled with a desiccant, and a filter member connected to the compressed air inflow side of the drying cylinder within the main body. A control chamber is provided on the compressed air inflow side of the filter member and normally communicates with a pressure release source to close the valve, and when this control chamber receives a valve opening air pressure signal, the air inside the main body is closed. In an air dryer device equipped with a drain valve that opens to communicate with the outside air, the air dryer is fixed to one end side of a control piston of the drain valve, and is connected between a passage in the main body on the compressed air inlet side and the outside air. The pressure receiving area of the valve member that opens and closes, which receives compressed air pressure from the passage on the compressed air inlet side in the main body, is determined by An air dryer device characterized in that the valve member is configured to be larger by a predetermined value than a pressure receiving area receiving compressed air pressure from the drain valve, and the valve member is normally in a closed position by a valve spring of the drain valve.