JPH0114779Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air dryer used in pneumatic equipment such as a vehicle height adjustment device.

[Prior art]

For example, when the weight of passengers, luggage, etc. on the car body increases, the car body lowers, and when the weight of passengers, baggage, etc. on the car body decreases, the car body rises. A vehicle height adjusting body (generally, a shock absorber and an air spring are integrated and is called an air leveler) that expands and contracts in the direction of the vehicle is provided. An air compressor (air supply source) is connected to the vehicle height adjustment body via a pipe (passage), a residual pressure valve, and an air dryer, and the air dryer is provided with an exhaust valve (not shown). When the weight on the car body increases and the car body becomes lower, the height adjustment body is extended, and when the weight on the car body decreases and the car body becomes taller, the height adjustment body is contracted and the car body is almost lowered. It can be adjusted to the desired height.

[Problem that the invention attempts to solve]

By the way, when the vehicle height adjuster is extended with the air inside the vehicle height adjuster being exhausted, a negative pressure is created inside the bag that constitutes the air spring of the vehicle height adjuster, and this bag is made of rubber. There was a problem in that the vehicle was sucked inward and this became an obstacle, causing the vehicle height adjuster to become inoperable. Therefore, in order to solve this problem, conventionally, the air dryer is provided with a residual pressure valve, and by the action of this residual pressure valve, the inside of the bag of the vehicle height adjuster is always maintained at a pressure (residual pressure) higher than atmospheric pressure.

However, since the residual pressure valve is built into the air dryer and no special device is provided, even if it is desired to adjust the residual pressure inside the bag of the vehicle height adjuster for some reason, the air dryer,
Unless the residual pressure valve is disassembled and special measures are taken,
It was not possible to adjust the residual pressure.

The purpose of this invention is to provide an air dryer that eliminates the above-mentioned problems of conventional dryers.

[Means for solving problems]

In order to achieve this purpose, this invention has the following structure. That is, one end has an inlet connected to a compressor for supplying compressed air, and the other end has an outlet connected to a pneumatic device that operates in response to a supply of compressed air. In an air dryer comprising a main body and a desiccant material filled in the main body for drying compressed air, a valve seat member is provided on the outlet side of the main body, has an air circulation hole, and is movable with respect to the main body. a check valve that is provided on the valve seat member and allows compressed air dried by the desiccant to flow only to the outlet side; and a check valve that is provided on the valve seat member and allows the valve seat member to be displaced from outside the main body. an adjusting portion, a valve member provided on the inlet side of the valve seat member for opening and closing the air flow hole, and a valve member configured to close the air flow hole in order to maintain the pressure on the outlet side at a predetermined pressure. An elastic member is provided to bias the member.

[Effect]

When the adjustment section provided on the valve seat member is operated from outside the air dryer to move the valve seat member closer to and away from the outlet, the urging force of the elastic member urging the valve member changes.

[Effect of idea]

To provide a compact air dryer in which the residual pressure in pneumatic equipment connected to the air dryer can be easily adjusted from the outside of the air dryer without disassembling the air dryer, and the adjustment mechanism is not exposed to the outside of the air dryer. be able to.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the figure, 1 is the main body of the air dryer, and this main body 1 consists of a container 2 and a lid 3 screwed into the container 2.
It is made up of. The main body 1 has an inlet 5 connected to a compressor 4 for supplying compressed air at one end thereof, and a pneumatic device (vehicle height adjustment body) which operates in response to the supply of compressed air at the other end. ) 6 has an outlet 7 connected thereto. A valve (not shown) is connected to the inlet 5 and is opened or closed by detecting the vehicle height of the vehicle provided with the vehicle height adjuster 6 .
Inside the main body 1, perforated plates 8, 9 and filter elements 10, 11 are located at both ends of the main body 1, respectively.
is provided. Filter element 10,1
A desiccant agent (for example, silica gel) 12 is filled between the spaces 1 and 1.

A cylindrical portion 13 is provided at the center of the lid 3 and projects inward, and an inner hole 14 of the cylindrical portion 13 is communicated with the outlet 7. This outlet 7 has
A pipe joint 16 having a center hole (outlet) 15 is attached. A threaded portion 17 is provided in the inner hole 14 of the cylindrical portion 13, and a cup-shaped holder (valve seat member) 18 is screwed into the inner hole 14.
19 is a seal ring. A through hole 20 is formed in the holder 18 to communicate the inlet side and the outlet side of the holder 18. A check valve 21 is provided on the outlet side of the through hole 20 to open and close the through hole 20 and to allow air from the inlet side of the holder 18 to pass only to the outlet side. Further, an adjustment portion 24 is formed in the center of the holder 18 and includes a circular hole (air circulation hole) 22 and a polygonal hole (air circulation hole) (for example, a hexagonal hole) 23. A valve seat 25 is formed around the inlet side of the adjustment portion 24 .

Additionally, a cup-shaped retainer 2 is provided inside the holder 18.
6 is slidably inserted. A communication hole 27 is formed in the retainer 26 to communicate the inlet side and the outlet side of the retainer 26. Further, a valve body (valve member) 28 is provided at the center of the retainer 26 .

Further, a spring receiver 29 is provided on the inlet side end of the cylindrical portion 13 of the lid 3 and is fixed by a retaining ring 30 . A hole 31 is formed in the center of the spring receiver 29. In addition, the spring receiver 29 and the retainer 26
A spring (elastic member) 32 fitted into the retainer 26 is interposed between the retainer 26 and the retainer 26 so as to urge the retainer 26 toward the outlet 7 side. As a result, the valve body 28 is normally seated on the valve seat 25.

Next, the operation of the air dryer configured as described above will be explained. When compressed air from the compressor 4 flows into the main body 1 through the inlet 5, this compressed air passes through the perforated plate 8, the filter element 10, and the desiccant 12, and is dried. The liquid passes through the hole 31, the inside of the retainer 26, the communication hole 27, and the through hole 20, opens the check valve 21, flows out from the outlet 7, enters the vehicle height adjustment body 6, and is expanded.

Furthermore, when the air inside the vehicle height adjuster 6 is exhausted, the air inside the vehicle height adjuster 6 passes through the polygonal hole 23 and the circular hole 22 from the outlet 7, and then moves to the valve body 28 against the force of the spring 32. is pushed toward the inlet 5 side, creating a gap between the valve seat 25 and the valve body 28, passing through this gap, and further between the communication hole 27, the hole 31, the perforated plate 9, the filter element 11, and the desiccant 12. , the filter element 10, the perforated plate 8, the inlet 5, and the valve (not shown).

Here, if it becomes necessary to adjust the residual pressure of the air inside the vehicle height adjuster 6 due to some circumstances,
Remove the tube (not shown) inserted into the pipe fitting 16 from the main body 1, and insert into the outlet 7 a tool (not shown) having a polygonal shaft whose tip fits into the polygonal hole 23. ) into the polygonal hole 2.
3 and rotate this polygonal hole 23.
Then, the holder 18 rotates and moves in its axial direction (in the direction of arrow A or arrow B shown in the figure). Therefore, the spring 32 expands or contracts in its axial direction via the retainer 26. This causes spring 3
2 changes the biasing force of the retainer 26 toward the outlet 7 side. Therefore, by changing the amount of rotation of the holder 18, the residual pressure in the vehicle height adjuster 6 can be easily adjusted from the outside without disassembling the air dryer.

In the above-mentioned embodiments, this invention was applied to the air supply and exhaust of a vehicle height adjuster, but the present invention is not limited to this, and may be applied to the air supply and exhaust of other pneumatic equipment.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1...Main body, 4...Compressor, 5...Inflow port, 6
... Pneumatic equipment (vehicle height adjustment body), 7 ... Outlet, 1
2... Desiccant (silica gel), 18... Holder (valve seat member), 21... Check valve, 24... Adjustment section.

Claims (1)

[Scope of utility model registration request] A main body having an inlet connected to a compressor for supplying compressed air at one end, and an outlet connected to a pneumatic device that operates by receiving the supply of compressed air at the other end. an air dryer comprising a desiccant material filled in the main body for drying compressed air; a valve seat member provided on the outlet side of the main body, having an air circulation hole and movable with respect to the main body; a check valve provided on the valve seat member and allowing compressed air dried by a desiccant material to flow only to the outlet side; and an adjustment portion provided on the valve seat member capable of displacing the valve seat member from outside the main body. a valve member provided on the inlet side of the valve seat member to open and close the air flow hole; and a valve member arranged in a direction to close the air flow hole to maintain the pressure on the outlet side at a predetermined pressure. An air dryer consisting of an elastic member that applies force.