JP2009183882A - Apparatus for drying compressed air - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for drying compressed air in which a governor installed on a support substrate is miniaturized, in which a piston for setting differential pressure and a piston for controlling air pressure are arranged in a stepped housing hole housing the governor, and in which the operation quality, the responsibility and the durability of the governor are improved. <P>SOLUTION: The apparatus for drying compressed air 19 is provided with a holding substrate 23 consisting of, metal molding products, having the inlet port connected with the discharge side of a compressor and the outlet port 20 connected to the main tank, the governor 21, and a drain valve device 22. The governor is installed in the stepped housing hole formed by the holding substrate. The slidable governor is slidable and possesses an approximately cylindrical holder housing a coil spring 21c, the piston 21b for setting differential pressure connected to the bottom surface of the approximately cylindrical holder and located, the piston for controlling air pressure housing in the inner opening of the piston for setting differential pressure, and a governor receiving plate housing the lower part of the piston for controlling air pressure in a freely reciprocating way and these are arranged respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention reduces the size of the governor provided on the support base of the compressed air drying apparatus and arranges the differential pressure setting piston and the air pressure adjustment piston in the stepped accommodation hole that accommodates the governor. The present invention relates to a compressed air drying device that improves responsiveness and durability.

Conventionally, an example of the technology of this type of compressed air drying apparatus is disclosed in a patent publication related to Japanese Patent No. 3771450 shown in FIG. Describing this, FIG. 4 shows a compressed air supply system to which the compressed air drying apparatus 1 is applied. A compressed air drying device 2 is connected to the discharge side of the compressor 1 and the compressed air dried by the compressed air drying device 2 is supplied to a main tank 3 which is an air reservoir of an operating device such as an air suspension device of an automobile. Yes, operating equipment is connected to the main tank 3. The compressed air supply system A removes moisture and oil mist from the compressed air discharged from the compressor 1 with the compressed air drying device 2 and then accumulates the pressure in the main tank 3 and supplies the compressed air to the operating equipment. Prevents moisture and oil mist from flowing into the operating equipment. The compressed air drying device 2 used in the compressed air supply system A includes an inlet port 4 connected to the discharge side of the compressor 1, an outlet port 5 connected to the main tank 3, a governor 6 shown in FIGS. 4 to 6, and a drain valve. 7, a drier 10 filled with a desiccant 9 and a purge tank 11 disposed between the drier 10 and the outlet port 5 are provided on the top of the base member 8. It is a configuration. In this compressed air drying device 2, when compressed air discharged from the compressor 1 flows from the inlet port 4, the desiccant 9 of the dryer 10 is compressed air when flowing from the purge tank 11 to the outlet port 5 through the dryer 10. Absorbs moisture inside.
In the governor 6 of the compressed air drying device 2, the air pressure of the outlet port 5 acts on the pressure receiving chamber 61, the governor piston 62 is pushed against the coil spring 63, the governor valve 64 is opened, and the drain valve 7 is opened. When the drain valve 7 is opened, the unloading operation is performed in which the discharge side of the compressor 1 is connected to the atmosphere, the compressed air in the dryer 10 is rapidly discharged, and then the desiccant 9 is dried by the dry air in the purge tank 11. Re-dry. Since the governor piston 62 of the governor 6 has a structure in which the area for receiving air pressure increases when the governor valve 64 is opened, the return air pressure of the governor piston 62 is lower than the air pressure during operation. Therefore, the air pressure in the main tank 3 is controlled within a certain width. In this way, the drying operation and the unloading operation of the compressed air drying device 2 are continued between the operation and return of the governor 6. 65 is a coil spring chamber.

FIG. 5 shows a structure in which the governor 6 is mounted in a base member 8. The compressed air drying apparatus 2 fills the base member 8 and a desiccant 9 on the base member 8. The dryer 10 and the purge tank 11 formed around the dryer 10 are fixed, and include an inlet port 4, an outlet port 5, a drain valve 7, and the governor 6. The compressed air drying device 2 is attached to a vehicle or the like with the base member 8 positioned below the mounting flange 12. The discharge compressed air of the compressor 1 supplied from the inlet port 4 flows into the pressure chamber 13, passes through the filter 13 from the hole 13 a, flows into the dryer 10 through the hole 14 a, is dehumidified with the desiccant 9, and then is dried. The check valve 15, the desiccant 9, and the regeneration throttle 15 a flow into the purge tank 11. The compressed air flowing into the purge tank 11 flows into the main tank 3 from the check valve 15 through the outlet port 5. The drain valve 7 is provided between the pressure chamber 13 and the exhaust passage having the exhaust pipe 16. The drain valve 7 is configured such that the compressed air supplied to the inlet port 4 by opening the exhaust valve 7a is: The pressure chamber 13 is discharged into the atmosphere from the silencer 17 through the exhaust pipe 7a through the exhaust pipe 16, and the compressor 1 is unloaded and the desiccant 9 of the compressed air drying device 2 is dried. In the figure, 18 is a check valve.

Then, the above-described governor 6 sends compressed air to the lower surface of the governor piston 62 through the passage 5 a of the outlet port 5 of the compressed air drying device 2. When the compressed air pressure is equal to or lower than the predetermined value, that is, when the air pressure enters the main tank 3 (lower limit value), the governor piston 62 is pushed down by the coil spring 63, that is, in the state of being pushed rightward in FIG. The governor valve 64 is closed, and the compressed air of the control port 62a flows through the exhaust stem 62b and is discharged from the coil spring chamber 65 to the atmosphere through the exhaust hole 6a.
Further, when the air pressure of the compressed air at the outlet port 5, that is, the air pressure of the main tank 3 increases, the governor piston 62 is pushed up in the opposite direction, that is, in the left direction in FIG. The exhaust stem 62b is closed by the governor valve 64, and the control port 62a is shut off. When the air pressure of the compressed air at the outlet port 5 rises and exceeds a predetermined value, that is, when the air pressure of the main tank 3 is released (upper limit value), the governor piston 62 moves by compressing the coil spring 63, The governor valve 64 is opened by the exhaust stem 62b. Therefore, the compressed air in the outlet port 5 flows through the gap adjacent to the governor valve 64 and flows from the control port 62a to the upper surface of the drain valve 7 of the compressed air drying device 2, and the drain valve 7 is opened. In FIG. 6, 64 a is a governor valve spring, and 6 c is a flange for supporting the coil spring 63. 6d is a central axis around which the coil spring 63 is wound, and 6e is a wall surface of the accommodation hole in which the governor piston 62 and the coil spring 63 are installed.
Patent Gazette related to Japanese Patent No. 3771450

The above-described compressed air drying apparatus in the prior art has the following problems because it has the above-described configuration and operation. In other words, the governor of the compressed air drying device operates by operating the governor piston 62 accommodated by the differential pressure of the compressed air pressure at the outlet port 5, which accommodates the governor piston 62 as shown in FIG. The differential pressure of the compressed air to be sent is set and controlled by the difference in the compressed air pressure receiving area due to the large diameter length D1 set between the housing hole wall surfaces 6d and 6d and the small diameter length D2 of the governor piston 62. As described above, the shape of the governor piston 62 and the space between the housing hole wall surfaces 6d and 6d are preset, the compressed air pressure receiving area is small, the operation of the governor 6 is limited, the smoothness is lacking, and the main tank 3 of various specifications is adapted. There was a problem of quality that could not be made. In addition, the space between the housing hole wall surfaces 6d and 6d is set to a large diameter length D1 = 40.3 (mm) and a small diameter length D2 = 40 (mm), for example. There is a problem that the weight is large and the volume is large, and the governor 6 and the governor housing hole are long. Further, there are many various parts such as the exhaust stem 62b, the governor valve 64, and the governor valve spring 64a that are accommodated in the accommodation hole in the governor 6, and cannot be replaced, and there is a problem in complexity and durability.

The compressed air drying apparatus according to the present invention was invented to solve the above-mentioned problems, and two pistons, a differential pressure setting piston and an air pressure adjusting piston, are arranged on a governor attached to the compressed air drying apparatus. The object of the present invention is to provide a new compressed air drying device that improves the responsiveness of the governor, improves the operation quality and durability, and allows parts to be replaced. .

That is, according to the first aspect of the present invention, a support base having an inlet port, an outlet port, a governor, and a drain valve device, a drying container filled with a desiccant in the support base, the drying container, and the outlet port And a purge tank arranged between the cylindrical holder, the governor is arranged in a stepped accommodation hole formed in the support base, and a cylindrical holder containing a coil spring, and the cylindrical holder A differential pressure setting piston which is joined to and arranged on the bottom surface and which pushes down or pushes up the cylindrical holder with compressed air from the outlet port, an air pressure adjusting piston housed in an inner hole of the differential pressure setting piston, and the air pressure adjusting piston It is characterized in that it is configured by arranging a governor seat that accommodates the door in a freely reciprocating manner.

According to a second aspect of the present invention, the configuration of the differential pressure setting piston, the air pressure adjusting piston, and the governor receiving seat is compressed so as to flow to the governor at the air pressure entry position (lower limit value) of the main tank. The air pressure receiving area S1 = (D3 ² −D4 ² ) · π / 4, and the air pressure receiving area S2 of the compressed air flowing to the governor at the air pressure release position (upper limit) of the main tank = (D3 ² −D4 ² + D5 ² ) · π / 4, where D3 is the outer diameter of the differential pressure setting piston or the hole length of the middle space of the step-like accommodation hole, and D4 is the air pressure adjustment of the governor seat D5 is the outer diameter of the lower surface of the air pressure adjusting piston or the inner diameter of the insertion hole of the governor seat.

Since the compressed air drying apparatus according to the present invention has the above-described configuration, it has the following effects.

That is, according to the present invention described in claim 1, a support base having an inlet port, an outlet port, a governor, and a drain valve device, a drying container filled with a desiccant in the support base, the drying container, In the configuration in which a purge tank is provided between the outlet port and the outlet port, the governor is arranged in a stepped accommodation hole formed in the support base, and a cylindrical holder containing a coil spring, and the cylindrical type A differential pressure setting piston which is joined and arranged on the bottom surface of the holder and which pushes down or pushes up the cylindrical holder with compressed air from the outlet port, a pneumatic pressure adjusting piston accommodated in an inner hole of the differential pressure setting piston, and the air pressure Provided is a compressed air drying device comprising a governor seat in which an adjustment piston is housed so as to be movable back and forth. .
Thus, the air pressure entry position (lower limit value) and the cut-off position (upper limit value) by the compressed air can be set as appropriate by changing the pressure receiving areas S1 and S2 of the compressed air. According to the device, parts such as the conventional governor valve and exhaust stem are not required, and in particular, two pistons, that is, the differential pressure setting piston and the air pressure adjustment piston are arranged, so the structure is miniaturized and simplified. As a result, it is possible to provide a high-quality governor while improving the performance and smoothing the operation and improving the responsiveness. Further, the compressed air drying device can be used for various devices such as an air suspension system and an air brake device mounted on a vehicle such as an automobile.

According to the second aspect of the present invention, the differential pressure setting piston, the air pressure adjusting piston, and the governor seat are configured to flow to the governor at the air pressure entry position (lower limit value) of the main tank. Compressed air pressure receiving area S1 = (D3 ² −D4 ² ) · π / 4, and the air pressure receiving area of the compressed air sent to the governor at the air pressure release position (upper limit value) of the main tank S2 = (D3 ² −D4 ² + D5 ² ) · π / 4, where D3 is the outer diameter of the differential pressure setting piston or the hole diameter length of the middle space of the step-like accommodation hole, and D4 is the governor seat 2. An outer peripheral diameter length of a portion for accommodating the air pressure adjusting piston so as to be movable forward and backward, and D5 is an outer peripheral diameter length of a lower surface of the air pressure adjusting piston or an inner diameter length of an insertion hole of a governor seat. Compression To provide a vapor drying apparatus.
Thus, by appropriately changing the shape and dimensions of the differential pressure setting piston and the air pressure adjusting piston, the pressure receiving area of the compressed air can be changed to adjust the amount of compressed air and can be applied to various small governors. The number of parts in the governor can be greatly reduced.

Embodiments of a compressed air drying apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a vertical sectional view showing an example of an embodiment of a compressed air drying apparatus according to the present invention.
FIG. 2 is a cross-sectional view showing the operation of the governor attached to the compressed air drying apparatus and showing a state where the housed coil spring is extended.
3 is a drawing showing the operation of the governor attached to the compressed air drying device, is a cross-sectional view showing a state in which the accommodated coil spring is compressed.

The compressed air drying device 19 has, for example, an inlet port (not shown) generally connected to the discharge side of the compressor, an outlet port 20 connected to a main tank (not shown), a governor 21, and a drain valve device 22. A support base 23 made of, for example, a metal molded product of aluminum or an alloy thereof, a drying container 25 filled with a desiccant 24 on the support base 23, for example, and a space between the drying container 25 and the outlet port 20. And a purge tank (outer cover) 26 arranged in the above.

When the compressed air discharged from the compressor flows into the compressed air drying device 19 from the inlet port, when the compressed air discharged from the compressor flows from the purge tank 26 to the outlet port 20 via the drying container 25, the desiccant 24 in the drying container 25 is contained in the compressed air. Absorbs moisture. The governor 21 of the compressed air drying device 19 is attached to the support base 23, and specifically, is disposed in a stepped accommodation hole formed in the support base 23. When the air pressure of the compressed air flowing to the outlet port 20 is pumped to the outlet port passage 21a and the differential pressure setting piston 21b is pushed against the coil spring 21c having a smaller diameter and lighter than the conventional coil spring, the drain of the drain valve device 22 is drained. The valve 22a is opened. When the drain valve 22 is opened, an unload operation is performed in which the discharge side of the compressor is connected to the atmosphere, the compressed air in the drying container 25 is rapidly discharged, and then the desiccant 24 is re-used by the dry compressed air in the purge tank 26. dry. As described above, the drying operation and the unloading operation of the compressed air drying device 19 are continued between the operation and return of the governor 21.

The compressed air drying device 19 is attached to a vehicle body such as a vehicle with the support base 23 positioned below, for example, with an attachment flange. The compressed air discharged from the compressor supplied from the inlet port flows into the drying container 25 through the hole 27a through the filter 27. The compressed oil and dust are removed by the filter 27 and dehumidified by the desiccant 24. The compressed air that has been dehumidified and dried opens the check valve 25a of the drying container 25 and is stored in the chamber 26a of the purge tank 26 through the passage 25b, and the remaining part passes through the outlet port 20 from the check valve 28 provided on the support base 23. Store in tank.
In the figure, 21d is an exhaust hole, 22b is a piston that controls the opening and closing of the drain valve 22a of the drain valve device 22, and 29 is a valve device that controls the amount of compressed air discharged from the exhaust hole 21d.

The drain valve 22a is closed when the desiccant 24 is dried, but when the pressure in the main tank reaches a predetermined value, the piston 22b is lowered by the command signal from the governor 21 and the drain valve 22a is opened. The drain containing moisture and oil is released to the outside together with the compressed air according to the opening / closing of the drain valve 22a. Therefore, a silencer 30 is provided at the discharge port of the drain valve 22a in order to reduce the noise accompanying the discharge.

Next, based on FIG.2 and FIG.3, the internal structure, operation | movement, etc. of the governor 21 with which the compressed air drying apparatus based on this invention was mounted | worn are demonstrated, and this invention is clarified.
The support base 23 forms an accommodation hole, specifically, a step-like accommodation hole 23a, and a governor 21 is provided in the step-like accommodation hole 23a. The governor 21 in the stepped accommodation hole 23a is slidable, for example, a substantially cylindrical holder 21e that houses a coil spring 21c, a differential pressure setting piston 21b that is joined to and arranged on the bottom surface of the substantially cylindrical holder 21e, A pneumatic pressure adjusting piston 21f accommodated in the inner hole of the differential pressure setting piston 21b and a governor seat 21h accommodating a lower portion 21g of the pneumatic pressure adjusting piston 21f so as to be able to advance and retreat are disposed.

The governor seat 21h is formed in a substantially cylindrical shape, and includes a small passage 21i communicating with the outlet port passage 21a, a large passage 21j communicating with the small passage 21i and formed along the central axis, and the large passage 21i. It has an insertion hole 21k that communicates with the passage 21j and in which a lower portion 21g of the air pressure adjusting piston 21f is inserted so as to be able to advance and retreat. Further, the governor seat 21h is fixed to the small space on the right side shown in FIG. 2 in the step-shaped accommodation hole 23a, and has a small passage 21n communicating with the control port passage 21m of the control port 31 connected to the drain valve device 22. The main passage 21j is perforated so as to be orthogonal and in communication. A small passage 21p that is orthogonal to and communicates with the large passage 21j is formed at an intermediate position of the governor seat 21h.

The air pressure adjusting piston 21f is substantially T-shaped when viewed from the side, and an upper portion 21q is formed in a disc shape and a lower portion 21g is formed in a columnar shape. The diameter of the upper portion 21q is shorter than the diameter of the inner hole 21w of the differential pressure setting piston 21b. The differential pressure setting piston 21b is movably inserted in the middle space at an intermediate position in the step-shaped accommodation hole 23a. The substantially cylindrical holder 21e forms a central hole 21r in the bottom 21s, and its side wall 21t is slidably inserted in the left large space portion shown in FIG. 2 in the step-shaped accommodation hole 23a. 21u is a cover of the governor 21, and covers the opening of the step-shaped accommodation hole 23a (the opening of the large space on the left side). And the support component 21v is fixed inside the lid | cover 21u, and the end of the coil spring 21c is supported. In the figure, reference numeral 32 denotes a fixing bolt that fixes the lid 21 u to the support base 23.

Then, the governor 21 according to the present invention described above causes compressed air to flow through the outlet port passage 21a of the outlet port 20 of the compressed air drying device 19 through the small passage 21i and the large passage 21j of the governor seat 21h, and the air pressure adjusting piston 21f. It is sent to the lower part 21g. When the air pressure of the compressed air is equal to or lower than a predetermined value, that is, when the air pressure is in the main tank (lower limit value), the air pressure adjusting piston 21f and the differential pressure setting piston 21b are moved downward by the coil spring 21c, that is, in FIG. It is in a state of being pushed down in the right direction, and the substantially cylindrical holder 21e is in a stationary state. The drain valve device 22 connected to the outlet port 20 is inactive. Compressed air in the control port 31 passes from the control port passage 21m through the small passage 21n and the large passage 21j, through the minute passage 21p and through the inner hole 21w of the differential pressure setting piston 21b, through the stepped accommodation hole 23a and from the exhaust hole 21d Released to the atmosphere via the device 29.

At this time, at the air pressure entry position (lower limit value) of the main tank, the member involved in the air pressure of the compressed air sent to the governor 21 is the differential pressure setting piston 21b, and the pressure receiving area S1 is expressed by the following equation. It is established by. That is, the pressure receiving area S1 = (D3 ² −D4 ² ) · π / 4.
Therefore, the pressure receiving area S1 has an advantage that the governor 21 can be downsized and a wide area can be secured as compared with the conventional technique, and the responsiveness of the operation of the governor 21 is improved and the quality is improved.
Here, D3 is the outer peripheral diameter length of the differential pressure setting piston 21b or the hole diameter length of the middle space portion of the step-shaped accommodation hole 23a. For example, the setting specification can be set to a small diameter length of about 25 (mm). D4 is the length of the outer circumference of the portion of the governor seat 21h that accommodates the air pressure adjusting piston 21f so as to freely advance and retract.

Further, the air pressure of the compressed air at the outlet port 20, that is, the air pressure of the main tank rises, and as shown in FIG. 3, the substantially cylindrical holder 21e is pushed up in the opposite direction, that is, the left side in FIG. That is, when the air pressure of the compressed air at the outlet port 20 rises and exceeds a predetermined value, that is, when the air pressure of the main tank is released (upper limit value), the compressed air is received by the governor through the outlet port passage 21a of the outlet port 20. The air is fed to the lower surface 21y of the lower portion 21g of the air pressure adjusting piston 21f, that is, the pressure receiving surface of the compressed air, through the small passage 21i and the large passage 21j of the seat 21h. The compressed air intervenes in the bottom surface 21x of the differential pressure setting piston 21b, that is, the pressure receiving surface of the compressed air, and pushes the air pressure adjusting piston 21f and the differential pressure setting piston 21b upward, that is, in the left direction in FIG. 21c is compressed and moved. Therefore, the compressed air in the outlet port 20 flows through the small passage 21n via the small passage 21i and the large passage 21j of the governor seat 21h, and flows from the control port 31 to the piston 22b of the drain valve device 22 of the compressed air drying device 19. Then, the drain valve 22a is opened.

At this time, at the position where the air pressure of the main tank is cut off (upper limit value), the members involved in the air pressure of the compressed air sent to the governor 21 are the differential pressure setting piston 21b and the air pressure adjusting piston 21f. The area S2 is established by the following equation. That is, the pressure receiving area S2 = (D3 ² −D4 ² + D5 ² ) · π / 4. Here, D5 is the outer peripheral diameter length of the lower 21g surface 21y of the air pressure adjusting piston 21f or the inner diameter length of the insertion hole 21k of the governor receiving seat 21h.

Therefore, the pressure receiving area S2 is smaller than that of the conventional technology and can secure a large area, and the compressed air pressure receiving area S2 is further increased by the area of the lower 21g surface 21y of the air pressure adjusting piston 21f. There is an advantage that the responsiveness of the operation of the governor 21 is improved and the quality is improved.

Thus, the governor 21 repeats the above operation. The above-described compressed air entry position (lower limit value) and release position (upper limit value) can be set as appropriate by changing the pressure receiving areas S1 and S2 of the compressed air, and the governor 21 or compressed air drying apparatus according to the present invention. 19 does not require a conventional governor valve, exhaust stem, or other parts, and in particular, two pistons, that is, a differential pressure setting piston 21b and an air pressure adjusting piston 21f are arranged, so that the structure is reduced in size and simplified. Thus, durability can be enhanced, the operation thereof can be smoothed, responsiveness can be enhanced, and a high-quality governor can be provided. The compressed air drying device 19 can be used for various devices such as an air suspension system and an air brake device mounted on a vehicle such as an automobile.

It is a vertical sectional view showing an example of an embodiment of a compressed air drying device concerning the present invention. It is drawing which shows operation | movement of the governor with which the compressed air drying apparatus concerning this invention was mounted | worn, Comprising: It is sectional drawing which shows the state which the accommodated coil spring expanded. It is drawing which shows operation | movement of the governor with which the compressed air drying apparatus concerning this invention was mounted | worn, Comprising: It is sectional drawing which shows the state which the accommodated coil spring compressed. It is a block diagram which shows the compressed air supply system to which the compressed air drying apparatus in a prior art is applied. It is a principal part vertical sectional view of the compressed air drying device applied to the compressed air supply system in the prior art. It is an expanded vertical sectional view which shows the structure of the governor with which the compressed air drying apparatus in the prior art was mounted | worn.

Explanation of symbols

19 Compressed air dryer 20 Outlet port 21 Governor 21a Outlet port passage 21b Differential pressure setting piston 21c Coil spring 21d Exhaust hole 21e Substantially cylindrical holder 21f Air pressure adjusting piston 21g Air pressure adjusting piston lower portion 21h Governor seat 21i Small passage 21j Large passage 21k Governor seat insertion hole 21m Control port passage 21n Small passage 21p Small passage 21q Air pressure adjusting piston top 21r Center hole 21s Bottom 21t Side wall 21u Governor lid 21v Support component 21w Inside of differential pressure setting piston Hole 21x Bottom face 21y of differential pressure setting piston Lower face 22 of air pressure adjustment piston Drain valve device 22a Drain valve 22b Piston 23 Support base 23a Stepped accommodation hole 24 Desiccant 25 Drying container 25a Reverse of drying container Stop valve 25b Passage 26 Purge tank 26a Purge tank chamber 27 Filter 27a Hole 28 Check valve 29 Valve device 30 Silencer 31 Control port 32 Fixing bolt

Claims (2)

A support base having an inlet port, an outlet port, a governor, and a drain valve device, a drying container filled with a desiccant in the support base, and a purge tank disposed between the drying container and the outlet port are provided. In the construction, the governor is arranged in a stepped accommodation hole formed in the support base and accommodates a cylindrical holder containing a coil spring, and is joined to the bottom surface of the cylindrical holder and is compressed from the outlet port. A differential pressure setting piston that pushes down or pushes up the cylindrical holder with air, an air pressure adjustment piston accommodated in an inner hole of the differential pressure setting piston, and a governor seat that accommodates the air pressure adjustment piston in a freely reciprocating manner. A compressed air drying device characterized by being arranged. The structure of the differential pressure setting piston, the air pressure adjusting piston and the governor seat is the pressure receiving area S1 = (D3) of the compressed air sent to the governor at the air pressure entry position (lower limit value) of the main tank. ²⁻ D4 ² ) · π / 4, and the pressure receiving area S2 = (D3 ² −D4 ² + D5 ² ) · of the compressed air sent to the governor at the main tank air pressure release position (upper limit value) The compressed air drying apparatus according to claim 1, wherein π / 4.
However, D3 is the outer diameter of the differential pressure setting piston or the hole diameter length D4 of the intermediate space portion of the step-like accommodation hole is the outer diameter D5 of the portion of the governor seat that accommodates the air pressure adjustment piston so as to be able to move forward and backward. The outer diameter of the lower surface of the piston or the inner diameter of the insertion hole of the governor seat

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