JPH0536489Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a compressed air drying device used in vehicles and the like to reduce the humidity of compressed air.

[Conventional technology]

A conventional compressed air drying apparatus of this type is shown in FIG. In the figure, reference numeral 1 denotes a cylindrical body, which is placed on the upper surface of the lid 2, and the opening side mounting flange 3 is brought into contact with the upper surface outer circumference 4 of the lid 2, and the bolt hole of the flange 3 is inserted into the lid 2. It is fixed without falling over by a bolt (not shown) that is screwed into.
6 is a drying container containing the adsorbent, and the main body 1
It has a bottomed cylindrical shape with a narrower body and lower height, and has a plurality of passages 7 near the outer periphery of the bottom that serve as inlets and outlets for compressed air. It is fixed in an unfailing manner by a bolt screwed into the lid body 2 through a bolt hole 8, and defines a space between it and the main body 1 to serve as an air storage tank (purge reservoir) 10. Since this drying container 6 is made of synthetic resin, there is a reinforcing member (gear-shaped metal plate) for reinforcing the bottom of the container.
11 are integrally formed. The upper opening of the drying container 6 is closed by an upper lid 12.
It has a check valve device consisting of an outlet hole 13 and a check valve 14, and a throttle passage 15 for regenerating dry air, and is fixed to the opening side flange 17 of the drying container 6 with a screw 16 via a sealing member 18. . A filter device 19 and a regenerated adsorbent 20 are housed in the drying container 6. The filter device 19 has a plurality of protrusions 21 provided at intervals in the circumferential direction on the inner bottom of the drying container 6. The adsorbent 2
0 is filled to a predetermined height on the porous partition plate 22 placed on the filter device 19 via the filter member 23 for preventing clogging, and is filled through the filter member 24 and the porous pressure plate 25 placed on the top surface of the layer. The whole is under suitable pressure by a spring 26.

The lid body 2 has passages 27 each having a predetermined depth that open to a plurality of passages 7 of the drying container 6, and communicates with the passages 27 through a radial passage 28, which opens at the side of the lid body 2 and compresses air (not shown). Inlet 2 connected to the device
9. It has an outlet 31 which is connected to a pneumatic circuit having a compressed air storage tank (not shown) which also opens on the side and communicates with the air storage tank 10 through an outlet passage 30, and has an outlet 31 in the center that is open to the upper and lower surfaces. A stepped hole 32 is formed. The stepped holes 32 have open ends of a plurality of radial passages 33, one end of which opens at the bottom side of the passage 27, and the other ends of a plurality of radial passages 33 that open at the bottom side of the passage 27.
A concave member 35 having a predetermined depth and having a tapered inner bottom surface with a valve hole 34 open to which the inner end of the valve hole 34 faces is connected to a stop ring 36.
It is inserted and prevented from coming off.

A stepped piston 37 serves as a control piston for the discharge valve V, and is inserted into the stepped hole 32. This stepped piston 37 has a stepped hole 3
It has a pressure receiving part 38 which slides on the large diameter 32a of the drying container 2 and defines a control chamber A between the bottom of the drying container 6, and a valve member 39 made of an elastic material is provided at the lower end via a stopper 40. It is attached by a bolt 41, and the elastic device 4
2, the valve member 39 is pressed upward during normal operation.
is seated on the periphery (valve seat) of the valve hole 34 within the concave member 35. As shown in FIG. 6, the control chamber A communicates through a control passage 44 with a control port 43 that introduces a pressure signal from a pressure governor that monitors the internal pressure of the compressed air storage tank (not shown). Note that an annular seal groove 45 is formed between the stepped hole 32 opening and the circularly arranged passage 27 openings surrounding the opening on the upper surface of the lid body 2, and the circularly arranged inlet passage. A seal groove 46 is formed so as to surround the opening 27, and seal members 47, 4 are provided to seal between the outer bottom surface of the drying container 6 and the outer bottom surface of the drying container 6, respectively.
8 is fitted and fixed. 49 is a nipple.

Next, the operation of this conventional device will be briefly explained.

Compressed air discharged from the air compressor (not shown) is guided to the inlet 29 through piping, and the inlet 2
9, enters the filter device 19 through passages 28, 27, and 7, where it is filtered, and then rises through the layer of adsorbent 20, during which time water is removed and the air becomes dry compressed air. The air flows out from the outlet hole 13 into the air storage tank 10 . A part of the dry compressed air flowing out from the drying container 6 fills the air storage tank 10 for regenerating the adsorbent, and the rest passes through the outlet passage 30 and is supplied from the outlet 31 to a pneumatic circuit including the compressed air storage tank.

When a pressure signal from the pressure governor is supplied to the control chamber A through the control port 43 and the control passage 44, the stepped piston 37 is driven downward against the elasticity of the elastic device 42, and the valve member 39 is separated from the valve seat. As the discharge valve V opens, the dry compressed air in the air storage tank 10 slowly flows into the drying container 6 from the throttle passage 15, passes through the layer of adsorbent 20 on the side of the passage 7, and the adsorbent 20, flows from the passage 7, passes through the passages 27, 33, and the valve hole 34, and passes through the nipple 4.
9 is discharged to the outside air.

[Problem that the invention attempts to solve]

In a compressed air drying device containing a regenerated adsorbent, the control port 43 is used to introduce a pressure signal into the control room A to open and close the discharge valve as described above.
However, in the conventional device described above, a control chamber A is defined at the center of the upper part of the lid body 2, and a control chamber A is formed at a position below the control chamber A on the side circumference of the lid body 2. Since the control passage 44 is designed to communicate with the opening 43 in the shortest possible manner, it becomes an inclined passage, and one end of the control passage 44 is configured to open at the side of the control chamber A, so that the control passage
44 is time-consuming, which increases production costs, increases the vertical thickness of the lid body 2, and increases the weight.

This invention was developed to solve the above-mentioned conventional problems, and allows the control passage connecting the control port and the control room to be created more easily and without much effort than in the past, and the lid body can be made lightweight. The purpose is to obtain a compressed air drying device that can be manufactured at low cost.

[Means for solving problems]

In order to achieve the above object, the present invention includes a horizontal passage extending radially from the control port to near the stepped hole, and a horizontal passage extending axially at a position radially outward from the stepped hole and having one end. A vertical passage that is connected to the horizontal passage and opens on the top surface of the lid so that the other end can face the bottom of the container is bored, and the periphery of both the upper end opening of the stepped hole and the opening on the other end side of the vertical passage is formed. An annular sealing member surrounding the lid and sandwiched between the top surface of the lid and the bottom of the container is provided, and a control passage is provided between the horizontal passage, the vertical passage, and the bottom of the container and the top of the lid. It is constructed by a gap defined on the inside.

[Effect]

Most of the control passages can be formed simultaneously with the molding of the lid, and are completed by joining the lid and the container with a sealing member interposed. Further, the control passage and the control chamber are communicated not through the stepped hole, but through the joint between the lid and the container.

[Example of idea]

FIG. 1 is a side longitudinal sectional view showing an embodiment of the present invention, in which constituent elements that are the same as or correspond to those of the conventional device are designated by the same reference numerals. Since the device shown in FIG. 1 and the conventional device have different configurations of the control passage portion of the lid 2, the plan and longitudinal cross-sectional views of the lid 2 of the embodiment are enlarged and shown in FIGS. 2 and 2, respectively. Shown in Figure 3.

In FIGS. 2 and 3, a control passage 50 that communicates the control port 43 with the control chamber A is substantially L-shaped, and has one end opening in the control port 43 and a horizontal passage extending horizontally toward the stepped hole 32 side. 5A and a vertical passage 50B, which is provided close to the stepped hole 32 and has one end open to the other end of the horizontal passage 50A and opens to the top surface of the lid body 2; 50B includes a horizontal groove 50C whose other end reaches the control chamber A and forms a gap with the bottom outer surface of the drying container 6.

The space between the outer bottom surface of the drying container 6 and the top surface of the lid body 2 is sealed by a sealing member 48 and a sealing member 51. The sealing member 51 has a potbelly shape as shown in FIG. The control room A and the vertical passage 5 are located inside the opening of the vertical passage 27 arranged in a circular manner on the upper surface of 2.
It is fitted into a seal groove 52 formed surrounding a portion including the opening of 0B. 53 and 54 are screw holes. The other configurations are the same as the conventional device shown in FIG.

In this embodiment, the pressure signal from the pressure governor is introduced into the control port 43, and the pressure signal is guided from the control port 43 through the gap formed between the groove 50C and the outer surface of the bottom of the drying container 6 through the horizontal passage 50A and the vertical passage 50B. ,
The stepped piston 37 enters the control room A through the gap.
is pushed down against the elasticity of the elastic device 42 to open the discharge valve. Other functions are the same as before.

A horizontal passage 5A constituting the control passage 50 in this embodiment communicates with the control port 43 and extends laterally from the control port 43, and a vertical passage 50B opens on the top surface of the lid body 2 and connects to the stepped hole 37. The groove 50C extends downward in parallel, and the gap is a groove 50C formed on the top surface of the lid body 2.
Since it is formed by molding, it can be formed by molding at the time of molding the lid body 2, and manual work for forming the control passage can be omitted.

Further, in this embodiment, the pressure signal is transmitted to the control chamber A through the gap between the top surface of the lid body 2 and the bottom of the drying container 6.
Therefore, the thickness of the lid body 2 can be reduced compared to the conventional case where the control passage is an oblique passage and opens at the side of the control chamber A.

Furthermore, when casting the lid body 2 using the mold, the vertical passage 50B and the horizontal passage 50A can be formed at the same time, and in particular, machining for forming the passage can be omitted.

[Effect of idea]

As explained above, according to the present invention, the control passage that connects the control port to the control chamber defined on the container side of the stepped hole includes a horizontal passage that extends in the radial direction to the front of the stepped hole, and A vertical passageway is formed in the lid body, one end of which is connected to the other end, and the other end is opened on the top surface of the lid body in line with the opening of the stepped hole, and an annular sealing member surrounding the stepped hole and the opening of the vertical passage is attached to the lid body. and the container, and is composed of vertical and horizontal passages and a gap defined inside the sealing member, so that a control passage can be formed together with the molding of the lid itself and the connection of the lid and the container. In addition, since there is no need to open the control passage in the middle of the stepped hole, it is easier to create the control passage than in the past, and the cost can be reduced accordingly, and the thickness of the lid body can be reduced. It is possible to reduce the weight by doing so.

[Brief explanation of the drawing]

Fig. 1 is a side longitudinal sectional view of an embodiment of the present invention;
The figure is a plan view of the lid body in the above embodiment, FIG. 3 is a front longitudinal sectional view of the lid body in the above embodiment, FIG.
The figure is a side vertical sectional view of a conventional compressed air drying device, and FIG. 6 is a front vertical sectional view of the lid in the conventional device. DESCRIPTION OF SYMBOLS 1... Cylindrical main body, 2... Lid body, 6... Drying container, 20... Adsorption material, 27... Inlet passage, 29...
...Entrance, 30...Exit passage, 31...Exit, 32
...Stepped hole, 37...Stepped piston, 41...Elastic device, 43...Control port, 50...Control passage, 5
0A...Horizontal passage, 50B...Vertical passage, 50C...
Groove, 51... sealing member.

Claims (1)

[Scope of utility model registration request] A cylindrical body with an opening at the lower end, a lid body that closes the opening and is attached to the cylindrical body, a container that is attached with a space formed between the lid body and the cylindrical body above the lid body, and the container. a regenerable adsorbent contained within the vessel, the vessel having a passage communicating the space into the vessel above the adsorbent, and communicating with the passage via a layer of adsorbent. and a passage opening at the bottom of the container, and the lid body has a stepped hole directly formed in the center thereof, the upper opening of which is covered by the bottom of the container, and is movable into the stepped hole. a stepped piston that is inserted to partition a control chamber between the container and the container; an elastic device that biases the stepped piston toward the front control chamber; a discharge valve device for valving, an inlet opening to the outside of the lid body and connected to an air compression device, and the inlet opening to the bottom of the container through a cavity formed inside the discharge valve device. an inlet side passageway that communicates with the passageway to which the lid body is attached; an outlet that is open to the outside of the lid body and connected to the air reservoir; an outlet side passageway that connects the outlet and the space; In a compressed air drying device in which a control port connected to a governor device and a control passage connecting the control port to the control chamber are provided, the step hole is formed in the lid body in a radial direction from the control port. a horizontal passageway extending close to the stepped hole; and a side passageway extending in the axial direction at a position radially outward from the stepped hole, one end communicating with the horizontal passageway, and the other end being connected to the top surface of the lid so that it can be connected to the bottom of the container. Each with an opening vertical passage is bored,
An annular sealing member is provided that surrounds both the upper end opening of the stepped hole and the other end opening of the vertical passageway and is held between the upper surface of the lid body and the bottom of the container, and A compressed air drying device comprising a horizontal passage, the vertical passage, and a gap defined inside the sealing member between the bottom of the container and the top surface of the lid.