JP3093311B2 - Compressed air dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air drying apparatus used for a brake pressure source of a vehicle or the like.

[0002]

2. Description of the Related Art For example, in a compressed air drying apparatus as disclosed in Japanese Utility Model Laid-Open No. 2-48125, drying of compressed air / regeneration of an adsorbent is repeated according to a load / unload cycle of the air compression apparatus. A governor device is used.

This governor device sends an air pressure signal (unload signal) to the air compressor when the pressure in the air storage tank reaches the upper limit, and stops sending the air pressure signal when the pressure drops to the lower limit ( The compressed air drying apparatus introduces the air pressure signal through a pipe to open the regeneration valve. With the opening of the regeneration valve, drain is released, and subsequently, the adsorbent is regenerated.

[0004]

Incidentally, the governor device is separate from the compressed air drying device, and the pneumatic signal is introduced through a pipe, so that the pipe may be an obstacle.

The present invention has been made to solve this problem, and there is no need to introduce a pneumatic signal for opening the regeneration valve from the outside through a pipe, which simplifies the pipe system as compared with the related art. It is an object of the present invention to provide a compressed air drying device that can perform the drying.

[0006]

According to the first aspect of the present invention, an inlet connected to an air compressor, an outlet connected to an air storage tank, and an inlet and an outlet are provided. A regenerable adsorbent disposed therebetween, and a regenerative valve provided in a passage communicating the inlet side of the adsorbent to the outside air and normally closing the valve, wherein the regenerative valve closes the passage; A movable body formed integrally with the valve body and receiving an urging force due to the outlet pressure in the valve opening direction in the valve opening direction and receiving a biasing force from a preload spring in the valve closing direction on the other end side. A pressure receiving surface for receiving the outlet pressure is formed in the other end side with an area smaller than the one end side, and a valve is formed to exhaust the other end side outlet pressure when the movable body moves by a predetermined value in the valve opening direction.

[0007] According to claim 2, and to supply through the diaphragm compressed air acting on the pressure receiving surface of the other end.

[0008]

According to the present invention, the outlet pressure acting on the difference area between the effective pressure receiving area of the pressure receiving surface at one end of the movable body and the effective pressure receiving area of the pressure receiving surface at the other end of the movable body has a predetermined upper limit pressure. , The regeneration valve opens .

[0009]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a base, 2 denotes a drying cylinder erected and fixed on the upper surface of the base 1, and 3 denotes a drying cylinder that covers the drying cylinder 2 and is erected on a flange 4 of the drying cylinder 2. , And a casing for partitioning the regenerating storage tank 5 between the casing and the drying cylinder 2. The drying cylinder 2 is a cylindrical body having a thick base 6 on the outer periphery of the bottom thereof.
Is formed with a through hole 8 and accommodates a filter device 9 in the inner bottom. The filter device 9 is fixed to a protrusion 10 projecting upward from the inner surface of the bottom wall 7 with a bolt 11. On the filter device 9, a perforated plate 12 and a filter member 13 are laminated, and an adsorbent 14 is filled thereon. Adsorbent 1
The filter member 15, the perforated plate 16, and the spring receiver 17 are sequentially stacked on the upper surface of the layer 4 and the layer of the adsorbent 14 is entirely formed by a spring 19 interposed between the lid 18 of the drying cylinder 2 and the spring receiver 17. And receive the compressive force. The lid 18 has an outlet hole 2
0 and a throttle hole 21 are formed, and a check valve 22 is attached. An outlet hole 23 which is a stepped hole opened on the upper and lower surfaces is formed in the base 6 of the drying cylinder 2, and a check valve 25 having the stepped surface 24 as a valve seat is housed in the outlet hole 23. doing. 25A is a valve spring for biasing the check valve 25.

The base 1 has an inlet 31, an inlet hole 32, and a vertical inlet passage 3 communicating with the inlet hole 32.
3, the outlet 33A and the outlet hole 34, and the outlet hole 34 and the base 6
A vertical hole 35 communicating with the outlet hole 23 is formed, and a cylindrical portion 36 is formed at the center.
Oriented holes 37 are formed. This hole 37 is used for drying tube 2
Communicates with the through hole 8 in the bottom wall 7. A plate-shaped member 38 is interposed between the upper end of the cylindrical portion 36 of the base 1 and the bottom wall 7 of the drying tube 2, and this member 38 fits into a concave portion 1 </ b> A formed on the upper surface of the base 1. And engage with the upper end surface of the cylindrical portion 36, and partially
7 has a short cylindrical portion 39 which extends while closing the upper opening and is fitted in the cylindrical portion 36 at the center. A portion of the member 38 which extends by closing the upper opening of the hole 37 is provided with a throttle passage 40A having one end opened to the hole 37, and a continuous short end 39a connected to this.
And a through hole 40B opening at the upper end of the hole. The inside of the cylindrical portion 36 communicates with the outlet hole 34 through the passage 41, the hole 37, and the passage 42. Passage 41 is entrance hole 32
The passage 42 opens near the partition 43 which is the bottom wall of the inlet hole 32 and the cylindrical portion 36. Base 1
From the bottom, a discharge tube portion 44 separated from the tube portion 36 by a partition 43 extends concentrically with the tube portion 36. This discharge cylinder 4
A plug 48 having a concave portion 45, a discharge hole 46, and a discharge port 47 is fitted to the plug 4 by a retaining ring 49.

A large-diameter portion 51 of a T-shaped movable body 50 is fitted in the cylindrical portion 36 of the base 1 so as to be slidable up and down.
The shaft portion 52 of the regeneration valve DV penetrates the partition wall 43 and protrudes into the concave portion 45 of the plug 48 in the discharge tube portion 44. Are attached by bolt members 55 having through holes 55a. This valve seat 53 is formed at the upper end periphery of the discharge hole 46.

The movable body 50 is urged downward by a preload spring 56. The spring 56 is provided between an engagement groove 39a formed on the lower end surface of the short cylindrical portion 39 of the member 38 and the large diameter portion 51. It is stretched over. A cylindrical portion 57 protrudes from the center of the upper surface of the large diameter portion 51 of the movable body 50, and a safety valve SV
Is screwed into the lower end of the valve plug 58. This valve
The upper end of the plug 58 is slidably fitted in the short tube portion 39 to define a space 59 between the plug 58 and the bottom wall 7 of the drying tube 2. The valve plug 58 has a valve hole 58a.
A valve body 60 having a lower end peripheral portion as a valve seat is held and housed by a valve spring 61, and an upper end portion of a stem 60 a of the valve body 60 protrudes from the valve hole 58 a into the space 59 . Valve plastic
The inside of the plug 58 communicates with the cylindrical portion 36 through a through hole 62. A bolt hole into which the bolt member 55 is screwed is formed with a through hole 63 and a valve plug 58.
Communicates within.

The inlet 31 is connected to an air compressor (not shown) which is always in operation, and the outlet 33A is connected to an air storage tank (not shown).

In this configuration, the compressed air discharged from the air compressor is supplied from the inlet 31 to the inlet hole 32 and the inlet passage 3.
3 to the bottom wall 7 of the drying cylinder 2 and through holes 8 in the bottom wall 7.
From the drying cylinder 2. Compressed air flowing into the drying cylinder 2 is a filter device 9, the porous plate 12, through the filter member 13 enters the layer of adsorbent 14 is dried while rising through the layers of adsorbent 14, the filter member 15, Through the perforated plate 16, it flows out of the outlet hole 20 of the lid 18 into the regeneration storage tank 5. The compressed air flowing into the regeneration storage tank 5 fills the regeneration storage tank 5, pushes down the check valve 25, and flows out from the outlet 33A through the outlet hole 34 to an air storage tank (not shown).

[0016] Pressure (Atsushi Ideguchi) of the outlet hole 34 with pressure rise in the air reservoir P _O is increased. This outlet pressure P _O
The movable body 5 passes through the passage 41, the hole 37, and the passage 42.
0 acts on the lower surface of the large-diameter portion 51 and has a throttle hole 40A,
It acts on the upper surface of the valve plug 58 through the through hole 40B and the space 59. The effective pressure receiving area of the lower surface of the large diameter portion 51 is Sa,
Assuming that the effective pressure receiving area on the upper surface of the valve plug 58 is Sb (<Sa) and the spring force of the preload spring 56 is F, the outlet pressure P _O increases and exceeds a predetermined upper limit pressure P _OU , and P _O · Sa> P _O・ Sb +
F, the movable body 50 moves upward against the spring force F of the preload spring 56, and the valve body 54 separates from the valve seat 53,
The regeneration valve DV opens.

When the valve element 54 separates from the valve seat 53, the drain collected at the bottom of the concave portion 45 of the discharge cylinder portion 44 is discharged into the atmosphere from the discharge hole 46 to the discharge port 47 at a stretch. The compressed air dried through the squeezing hole 21 gradually enters the drying cylinder 2 and flows down while regenerating the adsorbent 14 and passes through the through hole 8 and the inlet hole 33 of the bottom wall 7. , And flows out into the atmosphere from the exhaust port 47.

In this embodiment, the outlet pressure _Po is equal to the predetermined upper limit pressure P
Even if the pressure drops from _OU by ΔP, the pressure in the space 59 does not follow the decrease in the outlet pressure P _O due to the presence of the throttle passage 40A. Therefore, when ΔP reaches a certain size, Sa × (P _O
−ΔP) <Sb × P _O holds, and the regeneration valve DV closes. That is, (P _O -ΔP) is the lower limit pressure P _OD for closing the regeneration valve DV.

In this embodiment, when the outlet pressure P _O becomes higher than this, the upper end of the stem 60a of the safety valve SV comes into contact with the bottom wall 7 when the movable body 50 moves upward by a certain height. It is pushed down with respect to the plug 58 and separates from the valve seat (the lower end peripheral portion of the valve hole 58a), and the pressure in the space 59 is reduced within the valve plug 58, the passage 63 of the movable body 50, the bolt member 5
5 is exhausted to the atmosphere through the through holes 55a.

As described above, in the present embodiment, when the outlet pressure P _O acting on the difference between the effective pressure receiving areas Sa and Sb reaches the predetermined upper limit pressure P _OU , the regeneration valve DV opens and the throttle passage 40 is opened.
Due to the action of A, the pressure in the space 59 acting on the effective pressure receiving area Sb is delayed with respect to the decrease in the outlet pressure P _O , and when the pressure difference between the two reaches a predetermined value, the regeneration valve DV closes .

Therefore, the same operation as that of the above-mentioned built-in governor device can be obtained, and it is not necessary to externally provide the governor device as in the related art.

[0022]

Street [Effect the Invention The present invention described above, it is not necessary to introduce through a pipe air pressure signal to open the regeneration valve from the outside, as in the prior art, since there is no need to preset external the governor Thus, the piping system can be simplified as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base 2 Drying cylinder 5 Regeneration storage tank 14 Adsorbent 25 Check valve 31 Inlet 33A outlet 34 Outlet hole 36 Tube part 37 Vertical hole 40A Restriction passage 40B Through hole 41, 42 Passage 44 Discharge cylinder part 46 Discharge hole 47 Discharge Outlet 50 Movable body 51 Large diameter part 52 Shaft part 53 Valve seat 54 Valve body 56 Preload spring 58 Valve plug 60 Valve body 60a Stem DV Regeneration valve SV Safety valve

Claims (2)

(57) [Claims] 1. An inlet connected to an air compressor, an outlet connected to an air storage tank, a renewable adsorbent disposed between the inlet and the outlet, and an inlet side of the adsorbent exposed to outside air. A regeneration valve provided in an associated passage and normally closing the regeneration valve, wherein the regeneration valve is formed integrally with the valve body, and receives a biasing force due to an outlet pressure in an opening direction and is formed integrally with the valve body. A movable body for receiving the biasing force of the preload spring in the valve closing direction on the end side, wherein a pressure receiving surface for receiving the outlet pressure with an area smaller than the one end side is formed on the other end side of the movable body. A compressed air drying device provided with a valve for exhausting the outlet pressure at the other end when the movable body moves by a predetermined value in the valve opening direction. 2. The compressed air drying apparatus according to claim 1, wherein the compressed air acting on the pressure receiving surface on the other end side is supplied through a throttle.