JPH0742493Y2 - Structure of regenerative valve section of compressed air dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure of a regenerative valve portion of a compressed air drying device used in an air brake circuit of a vehicle or the like.

[Conventional technology]

As a compressed air drying device of this kind, a full-scale shokai 63-118930
There is one disclosed in the issue. This compressed air dryer is
It has a container filled with a regenerable adsorbent and a regenerating valve section, and introduces compressed air discharged by an air compression device into the container so that the compressed air ascends and passes through the bed of the adsorbent. In the meantime, the adsorbent adsorbs and removes water and oil contained in the compressed air. The dried compressed air is stored in the air storage tank. Then, the regeneration valve section is opened by utilizing the unload signal given to the air compression device, and when the regeneration valve section is opened, the dry compressed air flows back into the container and flows down in the layer of the adsorbent. Then, the adsorbent whose performance is deteriorated by adsorbing the water or oil is regenerated.

[Problems to be Solved by the Invention] This regenerative valve portion includes a valve hole formed to open downward, a tubular valve body inserted into the valve hole to form a valve seat,
A valve body that is biased by a valve spring in a direction to be seated on a valve seat and is incorporated in a valve body, a closing member having a pipe connection portion inserted into an opening end side of the valve hole, and a closing member that is disengaged from the valve hole. It has a structure with a stopper to prevent
The end of the valve body on the side of the closing member that accommodates the valve body has the same outer diameter as the closing member, and the portion of the valve hole that accommodates the end on the side of the valve body closing member and the closing member has the same inner diameter. Therefore, when the closing member moves up and down due to vibrations when the pipe is attached to the closing member or when the vehicle is traveling, the valve body is pinched between the bottom of the valve hole and the closing member and damaged. There are cases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure of a regenerative valve portion of a compressed air drying device that can prevent unnecessary pressure from being applied to the valve body side by a closing member. And

[Means for Solving the Problems]

In order to achieve the above object, the present invention has a regeneration valve portion of a compressed air drying device in which a portion where a closing member of a valve hole is inserted has a larger diameter than a portion where a valve body is inserted through a step portion, The closing member can be brought into contact with the step portion by moving the closing member inward of the valve hole.

[Action]

According to the present invention, even if a pushing force is applied to the closing member toward the inside of the valve hole, that is, toward the valve body side, the closing member engages with the step portion of the valve hole and moves further into the valve hole. Is blocked,
There is no pressure between the valve body and the bottom of the valve hole.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a base member having a base portion 4 having an inlet 2 and an outlet 3 opening to the outer peripheral surface, and a radiator fin 5 formed on the outer periphery by reducing the diameter from the base portion 4 and extending downward. A space 7 having a shape of a tubular portion 6 and opening to the upper surface of the base portion 4 and an opening to the lower end of the tubular portion 6 is formed, and the lower end of the tubular portion 6 is a lower lid member accommodating a regeneration valve 8. It is closed at 9. An accommodating cylinder 13 having an annular portion 10 and a tubular portion 11 having a diameter reduced from the annular portion 10 and extending downward in the space 7 and having a flanged portion 12 at the lower end of the tubular portion 11 is connected to the flanged portion 12. The thin mounting portion 12A is housed by being clamped and fixed between the lower end of the base member 1 and the lower lid member 9, and the storage cylinder 13 is a space peripheral wall of the base portion 4 and an inner peripheral surface of the cylinder portion 6. A passage 14 that communicates with the inlet 2 through the communication passage 2A is defined between them and a space 15 that serves as a passage between the upper cover recess 9A of the lower lid member 9 and the space. Since the cylindrical portion 11 has a spiral heat dissipation fin 11A on its outer peripheral wall, the passage 14 is a spiral passage.
A passage 16 communicating with the space 15 is formed in the collar-shaped portion 12. That is, the passage 14 communicates with the inlet 2 through the communication passage 2A on the upper end side, and communicates with the space 15 through the passage 16 on the lower end side.

An oil separator 17 is housed in the cylinder portion 11 of the storage cylinder 13, and in this oil separator 17, the ring body 19 held by the flange portion at the lower end of the casing 18 is fixed to the lower end of the cylinder portion 11 together with the flange portion by screws. And is supported in the tubular portion 11, and the ring body 19 is
A dish-shaped perforated plate (20) that fits in the lower opening of the casing (18) and supports a felt material that covers the oil separator filling (element) is held.

An annular plate member 21 is fixed to the upper surface of the base member 1 with screws, and a container 24 of a drier in which a recyclable desiccant 23 is filled via a spacer 27 on the plate member 21. The reduced diameter cylindrical portion 25 at the lower part is fitted and placed in the annular portion 10 of the storage cylinder 13 via the sealing member 26. The bottom of the reduced diameter tubular portion 25 is a porous wall, and the filter 28 is housed in the reduced diameter tubular portion 25 and fixed with bolts 29. The porous plate and the felt are interposed on the filter 28. Are filled with the desiccant 23. A felt material 30A and a perforated plate 30B are provided on the upper surface of the packed layer of the desiccant 23
Are sequentially stacked, and a coil spring 32 is interposed between the perforated plate 30B and the lid 31 of the container 24. An outlet hole 33 and a throttle hole 34 are formed in the lid 31, and a check valve 35 that is closed from the outer surface side of the outlet hole 33 is attached.

Reference numeral 36 denotes a cover member, which covers the container 24 of the dryer and is fixed to the upper surface of the base portion 4 with screws 37, and defines a storage tank 38 for storing compressed compressed air with the container 24. is doing. The storage tank 38 communicates with the outlet 3 through a communication passage 39 formed in the plate member 21 and the base portion 4. 40 is a bush metal fitting for the communication passage 39.

The lower lid member 9 is formed with a regeneration valve storage cylinder portion 42 having an opening at the lower end, and although not shown in the drawings, a control port that is opened on the side peripheral surface and is connected to the governor device, and a regeneration port for this control port. A communication passage communicating with the inside of the valve housing tubular portion 42 is formed.

The regeneration valve storage cylinder portion 42 is also a drain storage portion of the lower lid member 9.
It has a passage 42a communicating with 9B. Reference numeral 43 denotes a tubular valve body (valve plug), which is inserted into the tubular hole (valve hole) 42A of the regenerative valve housing tubular portion 42A from below and is housed therein.
It is secured by a retaining ring 50 through 9. The valve body 43 has an annular valve seat portion 43a whose outer peripheral side is inclined downward, and an opening surrounded by the valve seat portion 43a and a regenerative valve storage cylinder portion 42.
A radial passage 43b that communicates with the passage 42a is formed, and a valve piston 44 is built in, and the valve body 43 is fitted into the storage cylinder portion 42. The piston 44 is urged upward by a valve spring 45 to define a control chamber 46 communicating with the control port with the upper bottom of the storage cylinder 42, and the valve piston 44 has a valve 47 with a valve 47. Body 48 is attached. The valve body 48 is normally seated on the valve seat portion 43a from below.

The closing member 49 is formed with a pipe connecting portion 49A and is fitted to the lower portion of the regenerative valve accommodating cylinder portion 42.
The portion 42B that houses the closing member 49 has a larger diameter than the portion that houses the valve body 43, and both parts are divided by the step portion 42C, and the closing member 49 contacts the step portion 42C from below. It is stored in the portion 42B.

It should be noted that a double-width portion is formed on the outer surface of the lower small-diameter portion of the closing member 49 to serve as a tool engaging portion at the time of pipe connection so that the pipe can be screwed.

Reference numerals 51 to 60 are ring-shaped sealing members.

The inlet 2 is connected to a discharge port of an air compressor (not shown), and the outlet 3 is connected to an air storage tank.

In this configuration, the compressed air discharged from the air compressor is introduced into the inlet 2, flows down from the inlet 2 through the communication passage 2A through the above-mentioned spiral passage, enters the oil separator 17 from the space 15, and the oil separation In the container 17, the oil content is removed in the ascending process to reach the annular portion 10 of the storage cylinder 13, and the annular portion 10 enters the container 24 through the porous bottom wall of the container 24. The oil and the like are removed again and rise to the layer of the desiccant 23. While ascending this layer, the moisture is removed to form dry compressed air, which is sent out from the outlet hole 33 to the storage tank 38. Storage tank
The dry compressed air sent to 38 fills this storage tank 38,
It flows from the communication passage 39 to the outlet 3, and flows into an air storage tank (not shown) connected to the outlet 3.

When the pressure in the air storage tank rises and reaches a predetermined upper limit pressure, a governor device (not shown) operates to send an unload signal to the air compressor, and the unload signal is controlled through the control port. Entered into chamber 46. As a result, the valve piston 44 descends against the valve spring 45 and the valve body 48 separates from the valve seat portion 43a, that is, the regenerative valve 8 opens, so that the drain accumulated in the drain reservoir 9A is removed. The dry compressed air in the storage tank 38 is rapidly discharged to the outside, and then enters the container 24 through the restriction hole 34, and flows down through the layer of the desiccant 23 while regenerating the desiccant 23, and the filter 28 and oil separation. It is gradually discharged into the atmosphere through the device 17.

In the present embodiment, at the lower end of the valve body 43, the outer diameter of the closing member 49 is made larger than the outer diameter of the downward recess for accommodating the valve body 48, and the valve hole 42A of the regenerative valve accommodating cylinder portion 42 Since the portion for housing the main body 43 and the portion 42B for housing the closing member 49 are separated by the step portion 42C, the closing member 49, even if a pressing force directed to the valve body 43 side acts, the closing member 49, The top part is a step 42C
After contacting the valve body 43, the valve body 43 does not move to the side of the valve body 43. Therefore, the valve body 43 is not pushed to the bottom side of the housing tubular portion 42 and is not pinched between the bottom and the bottom.

[Effect of device]

As described above, according to the present invention, the storage portion of the closing member in the valve hole, which is retained by the retaining ring and supports the valve body from below,
Since the diameter of the valve main body is larger than that of the storage part and the partition is divided at the step, the movement of the closing member inward from the step is prevented. It is possible to reliably prevent an excessive force from acting on the valve body.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention. 8 ... Regeneration valve, 42 ... Regeneration valve storage cylinder part, 42A ... Cylindrical hole (valve hole), 42B ... Closing member storage (insertion) part, 42C ...
… Step, 43 …… Valve body, 45 …… Valve spring, 48 …… Valve body, 49
...... Closing member, 50 ...... Retaining ring (stopper)

Claims (1)

[Scope of utility model registration request] 1. A valve hole formed so as to open downward,
A tubular valve body that is inserted into the valve hole to form a valve seat, a valve body that is urged in the direction of seating on the valve seat by a valve spring and incorporated into the valve body, and a pipe that is inserted into the valve hole open end side In a structure of a regenerative valve portion of a compressed air drying device having a closing member having a connection portion and a stopper preventing the closing member from coming off from the valve hole, a portion of the valve hole into which the closing member is inserted, A regenerative valve unit of a compressed air drying device, which has a diameter larger than that of a portion into which the valve body is inserted through a step portion, and the closing member and the step portion can contact each other by moving the closing member inward of the valve hole. Structure.