JPH04322717A - Compressed air dryer - Google Patents

Abstract

PURPOSE:To provide a compressed air dryer capable of making a piping system simpler compared with conventional dryers without the need of introducing an air pressure signal to open a regeneration valve through piping from the outside. CONSTITUTION:A dryer is equipped with an inlet 31 connected with an air compressor, an outlet 33 connected with an air tank, a regenerable adsorbent 14 arranged between the inlet 31 and the outlet 33, and a regeneration valve DV which is installed in a passage connected with the open air on the inlet side of the adsorbent 14 and normally closed. In a compressed air dryer where a regeneration valve A is provided with a valve disc 54 to close the passage and a movable body 50 which is formed being integral with the valve disk and receives energizing force by outlet pressure in the direction of opening the valve on one end side and receives energizing force by a preload spring 56 in the direction of opening the valve on the other end side, a pressure receiving surface receiving the outlet pressure by area smaller than that on one side of the movalbe body 50 is provided on the other side, and at the same time, when the movable body 50 is moved to the specified value in the direction of opening the valve, a valve SV to exhaust the outlet pressure on the other end side is formed.

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 device used in a brake pressure source of a vehicle or the like.

0002

[Prior Art] For example, as shown in Japanese Utility Model Application Publication No. 2-48125, in a compressed air drying device, drying of compressed air/regeneration of adsorbent is repeated according to the loading/unloading cycle of the air compressing device. A governor device is used.

This governor device sends out 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 out the air pressure signal when it drops to the lower limit ( The compressed air dryer introduces this air pressure signal through the piping to open the regeneration valve. By opening the regeneration valve, drain is discharged, and the adsorbent is subsequently regenerated.

0004

By the way, since the governor device is separate from the compressed air drying device and the air pressure signal is introduced through piping, this piping can sometimes get in the way.

The present invention was made to solve this problem, and it is not necessary to introduce a pneumatic signal from the outside through piping to open the regeneration valve, simplifying the piping system compared to the conventional method. The purpose of the present invention is to provide a compressed air drying device that can

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an inlet connected to an air compression device, an outlet connected to an air storage tank, and an inlet and an outlet connected to each other. a regenerating adsorbent disposed between them, and a regeneration valve provided in a passage connecting the inlet side of the adsorbent to outside air and normally closed, the regeneration valve closing the passage; A compressed air drying device comprising a movable body that is formed integrally with the valve body and receives a biasing force due to the outlet pressure in the valve opening direction, and a movable body having the other end that receives the biasing force due to the preload spring in the valve closing direction. A pressure receiving surface that receives outlet pressure is formed on the other end side with an area smaller than that on the one end side, and a valve is formed that exhausts the outlet pressure on the other end side when the movable body moves by a predetermined amount in the valve opening direction.

According to a second aspect of the present invention, the compressed air acting on the pressure receiving surface on the other end side is supplied through a throttle.

[0008]

[Operation] In the present invention, the regeneration valve has an outlet pressure that acts on the difference area between the effective pressure receiving area of the pressure receiving surface on one end side of the movable body and the effective pressure receiving area of the pressure receiving surface on the other end side of the movable body, at a predetermined upper limit pressure. When it reaches, the regeneration valve DV opens.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a base, 2 is a drying tube erected and fixed on the upper surface of the base 1, and 3 is a drying tube erected on the collar 4 of the drying tube 2, covering the drying tube 2. , a casing that partitions a regeneration storage tank 5 between the drying cylinder 2 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, and a bottom wall 7.
A through hole 8 is formed in and a filter device 9 is housed in the inner bottom. This filter device 9 is fixed to a projection 10 projecting upward from the inner surface of the bottom wall 7 with a bolt 11. A porous plate 12 and a filter member 13 are stacked on top of the filter device 9, and an adsorbent 14 is filled thereon. Adsorbent 1
A filter member 15, a perforated plate 16, and a spring receiver 17 are sequentially stacked on the upper surface of the layer No. 4, and the layer of adsorbent 14 is entirely covered by a spring 19 interposed between the lid 18 of the drying cylinder 2 and the spring receiver 17. subject to a compressive force. This lid 18 has an outlet hole 2.
0 and a throttle hole 21 are formed, and a check valve 22 is attached. The base 6 of the drying tube 2 is formed with an outlet hole 23 which is a stepped hole that opens on the upper and lower surfaces, and a check valve 25 whose valve seat is on the stepped surface 24 is housed in the outlet hole 23. are doing. 25A is a valve spring for biasing the check valve 25.

The base 1 has an inlet 31 and an inlet hole 32 opening on the circumferential surface, and a vertical inlet passage 33 communicating with the inlet hole 32.
, a vertical hole 35 communicating with the outlet 33 and the outlet hole 34 and the outlet hole 34 and the outlet hole 23 of the base 6 are formed, and a cylindrical part 36 is formed in the center. 37 is formed. This hole 37 communicates with a through hole 8 in the bottom wall 7 of the drying cylinder 2. 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 cylinder 2, and this member 38 is fitted into the recess 1A formed on the upper surface of the base 1. The short cylindrical portion 39 is engaged with the upper end surface of the cylindrical portion 36, a portion extends to close the upper opening of the hole 37, and has a short cylindrical portion 39 in the center that fits inside the cylindrical portion 36. In the portion of the member 38 that closes the upper opening of the hole 37 and extends, there is a throttle passage 40A whose one end opens into the hole 37 and a through hole 40B which is continuous with this and whose one end opens at the upper end of the short cylindrical part 39. It is formed. Further, the inside of the cylindrical portion 36 communicates with the outlet hole 34 through a passage 41, a hole 37, and a passage 42. The passage 41 opens into the inlet hole 32 and the outlet hole 34, and the passage 42 opens near the inlet hole 32 and a partition wall 43 which is the bottom wall of the cylindrical portion 36. From the bottom of the base 1, a discharge cylinder part 44 separated from the cylinder part 36 by a partition wall 43 extends concentrically with the cylinder part 36. This discharge cylinder part 44 has
Plug 4 having a recess 45, a discharge hole 46, and a discharge port 47
8 is fitted with a retaining ring 49 to prevent it from coming off.

A large diameter portion 51 of a T-shaped movable body 50 is fitted into the cylindrical portion 36 of the base 1 so as to be vertically slidable.
The shaft portion 52 of the regeneration valve DV penetrates the partition wall 41 and protrudes into the recess 45 of the plug 48 in the discharge cylinder portion 44, and the lower end of the shaft portion 52 has a valve body 54 of the regeneration valve DV seated on and off the valve seat 53. is attached with a bolt member 55 having a through hole 55a. This valve seat 53 is formed around the upper end of the discharge port 46 .

The movable body 50 is urged downward by a preload spring 56, and the spring 56 is inserted between the 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 set up on. 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 installed in this cylindrical portion 57.
The lower end of the valve plug 58 constituting the valve plug 58 is screwed into the valve plug 58. The upper end of this valve plug 58 is slidably fitted into the short cylindrical portion 39 and defines a space 59 between it and the bottom wall 7 of the drying tube 2 . The valve plug 58 has a valve hole 58a, and houses a valve body 60 whose lower end periphery serves as a valve seat and is held by a valve spring 61. It projects into the space 69 from the hole 58a. The inside of the valve plug 58 communicates with the cylindrical portion 36 through a through hole 62 . A bolt hole into which the bolt member 55 is screwed communicates with the inside of the valve plug 58 through a through hole 63.

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

In this configuration, the compressed air discharged by the air compressor is passed from the inlet 31 to the inlet hole 32 to the inlet passage 3.
3 to reach the bottom wall 7 of the drying cylinder 2, and the through hole 8 of the bottom wall 7
Flows into the drying cylinder 2 from there. The compressed air that has flowed into the drying cylinder 2 passes through the filter device 9, the perforated plate 12, and the filter member 13, enters the layer of the filler 14, is dried while rising through the layer of the filler 14, and is dried by the filter member 15, It flows through the perforated plate 16 and out of the outlet hole 23 of the lid 18 into the regeneration storage tank 5 . The compressed air flowing out into the regeneration storage tank 5 fills the regeneration storage tank 5, pushes down the check valve 25, passes through the outlet hole 34, and flows out from the outlet 33 into an air storage tank (not shown).

As the pressure in the air storage tank increases, the pressure (outlet pressure) Po in the outlet hole 34 increases. This outlet pressure P
o acts on the lower surface of the large diameter portion 51 of the movable body 50 through the passage 41, the hole 37, and the passage 42, and also acts on the lower surface of the large diameter portion 51 of the movable body 50.
, 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
, the effective pressure receiving area of the upper surface of the valve plug 58 is Sb (<Sa),
When the spring force of the preload spring 56 is F, the outlet pressure Po rises and exceeds the predetermined upper limit pressure P0U, and when Po・Sa>Po・Sb+F, the movable body 50 resists the spring force F of the preload spring 56. Then, the valve body 54 is removed from the valve seat 53, and the regeneration valve DV is opened.

When the valve body 54 is removed from the valve seat 53, the drain accumulated at the bottom of the concave portion 45 of the discharge cylinder portion 44 is discharged into the atmosphere from the exhaust hole 46 → the discharge port 47, and then the drain is discharged into the atmosphere from the regeneration storage tank 5. Dry compressed air gradually enters the drying cylinder 2 through the throttle hole 21, and this dry compressed air flows down while regenerating the adsorbent 14, and flows through the through hole 8 of the bottom wall 7.
It passes through the inlet hole 33 and flows out into the atmosphere from the exhaust port 47.

In this embodiment, even if the outlet pressure Po decreases by ΔP below the predetermined upper limit pressure P0U, the pressure in the space 59 does not follow the decrease in the outlet pressure Po because of the throttle passage 40A. Therefore, when ΔP reaches a certain size, Sa×
(PO −ΔP)<Sb×PO is established, and the regeneration valve DV
is closed. That is, (PO - ΔP) becomes the lower limit pressure P0D that closes the regeneration valve DV.

In this embodiment, when the outlet pressure PO 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.
The valve body 60 is pushed down against the valve plug 58 and the valve seat (
The pressure in the space 59 is exhausted to the atmosphere through the valve plug 58, the inner hole 50a of the movable body 50, and the through hole 55a of the bolt member 55.

As described above, in this embodiment, when the outlet pressure PO acting on the difference area between the effective pressure receiving areas Sa and Sb reaches the predetermined upper limit pressure P0U, the regeneration valve DV opens and the operation of the throttle passage 40A is reduced. The space 5 that acts on the effective pressure receiving area Sb by
When the pressure inside 9 lags behind the decrease in outlet pressure PO and the differential pressure between the two pressures reaches a predetermined value, the regeneration valve DV opens.

[0021] Therefore, the same effect as when the above-mentioned governor device is built in can be obtained, and there is no need to provide an external governor device as in the conventional case.

[0022]

[Effects of the Invention] As explained above, the present invention eliminates the need to introduce a pneumatic signal from the outside through piping to open the regeneration valve, and eliminates the need to install an external governor device as in the conventional case. , the piping system can be simplified compared to conventional methods.

[Brief explanation of drawings]

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

[Explanation of symbols]

1 Base 2 Drying tube 5 Regeneration storage tank 14 Adsorbent 25 Check valve 31 Entrance 33 Exit 34 Exit hole 36 Cylinder part 37 Vertical hole 40A Throttle passage 40B Through hole 41, 42 Passage 44 Discharge cylinder part 46 Discharge hole 47 Discharge port 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)

[Claims] Claim 1: An inlet connected to an air compression device, an outlet connected to an air storage tank, a regenerable adsorbent disposed between the inlet and the outlet, and an inlet side of the adsorbent connected to the outside air. The regeneration valve is provided in a communicating passage and is normally closed, and the regeneration valve includes a valve body that closes the passage, and a valve body that is integrally formed with the valve body and receives an urging force in the valve opening direction due to the outlet pressure. In a compressed air drying device having a movable body on an end side that receives a biasing force from a preload spring in a valve closing direction, a pressure receiving surface that receives outlet pressure is formed on the other end side of the movable body with a smaller area than that on the one end side, and , a compressed air drying device formed with a valve that exhausts the outlet pressure on the other end side when the movable body moves by a predetermined value in the valve opening direction. 2. The compressed air drying device according to claim 1, wherein the compressed air acting on the pressure receiving surface on the other end side is supplied through a throttle.