Silencer, exhaust valve, valve device, air dryer, compressed air supply device for vehicle, and compressed air supply system

Patent metadata

Field	Value
Publication number	US-2016339378-A1
Application number	US-201615230129-A
Country	US
Kind code	A1
Filing date	Aug 5, 2016
Priority date	Nov 15, 2010
Publication date	Nov 24, 2016
Grant date	—

Abstract

An air dryer includes a supporting base, a drying agent container, and an outer cover. The supporting base includes an inlet for receiving compressed air to be subject to a drying process and an outlet for delivering the processed compressed air that has undergone the drying process. The drying agent container is a container supported on the supporting base, contains a drying agent in the interior, and enables the drying process to be performed by passing the compressed air from the inlet through the drying agent. The outer cover surrounds the outer side of the drying agent container on the supporting base and defines a chamber for storing the compressed air between itself and the drying agent container. The supporting base includes first and second mounting surfaces, which are oriented in different directions, and a plurality of inlets, which are oriented in different directions and receive the compressed air.

First claim

1 . A valve device configured to open and close a bypass flow passage bypassing a flow passage of gas between a gas compressor and a gas tank storing the gas supplied from the gas compressor, comprising:
a volume chamber wherein the internal pressure of the volume chamber is increased by gas being supplied from at least one of the gas compressor and the gas tank and is decreased by gas flowing out over a predetermined time from a hole portion in accompaniment with pressure reduction on the side corresponding to the gas compressor; and a first valve in communication with the volume chamber, wherein the first valve is configured to open the bypass flow passage due to pressure reduction on the side corresponding to the gas compressor in a state where a predetermined pressure is reached at the volume chamber, and thereafter close the bypass flow passage due to reduction of the internal pressure of the volume chamber, wherein the first valve is configured to open and close the bypass flow passage by a piston sliding inside a cylinder portion formed independently of the volume chamber.

2 . The valve device according to claim 1 , wherein at least three ring-shaped sealing members are arranged at appropriate intervals along the movement direction of the piston on the outer periphery of the piston to partition the interior of the cylinder portion into at least four portions of first to fourth spaces in that order in the movement direction of the piston,
a first opening in communication with the gas compressor side flow passage in the bypass flow passage and a second opening in communication with the gas tank side flow passage in the bypass flow passage are formed at a predetermined interval in the movement direction of the piston in the inner wall of the cylinder portion, the first space is a space that is constantly in communication with the volume chamber regardless of the position of the piston, the fourth space is a space having the first opening at its inner side regardless of the position of the piston, the second space is a space that is constantly put in communication with the fourth space by a communication passage formed inside the piston, the third space is a closed space, the piston is urged in the direction of closing the first valve by an urging member, the first valve is put in the closed state by a state where the second opening is positioned inside the third space being maintained by balancing of the pressure acting on the piston in the first space and the pressure acting on the piston in the fourth space in the state where the gas is supplied from the gas compressor, the first valve is put in the open state when, due to pressure reduction on the side corresponding to the gas compressor, the pressure acting on the piston in the first space overcomes the pressure acting on the piston in the fourth space to move the piston until the second opening is positioned inside the second space, the first valve is thereafter put in the closed state when, due to reduction of the internal pressure of the volume chamber, the pressure acting on the piston in the first space decreases and the piston is returned by the urging force of the urging member until the second opening is positioned inside the third space.

3 . The valve device according to claim 1 , further comprising a second valve for filling gas into the volume chamber and a third valve for discharging the gas from the volume chamber via the hole portion.

4 . The valve device according to claim 3 , wherein the gas discharged from the volume chamber via the hole portion is released to the atmosphere.

5 . An air dryer, comprising:
a drying portion having a regenerable drying agent; and a regeneration valve device connected to a first end of a flow passage in the drying portion, wherein the regeneration valve device is the valve device according to claim 1 , the drying portion is located between the regeneration valve device and both the gas compressor and the gas discharge valve, and the drying agent is dried using the gas in the gas tank that flows in reverse when the gas discharge valve is opened and the first valve opens the bypass flow passage.

6 . A regeneration valve device for an air dryer, comprising:
a chamber that is located between a drying portion that performs a drying process on a compressed gas supplied from a gas compressor and a gas tank that stores the dry compressed gas that has undergone the drying process, wherein the pressure of the gas acts on the chamber; a piston configured to move inside the chamber and define the interior of the chamber into a first end space on the side corresponding to the gas tank and a second end space on the side corresponding to the drying portion; a valve configured to be put in a closed state by the piston moving toward the first end and to be put in an open state by the piston moving toward the second end; an urging member that urges the piston in the direction in which the valve is closed; a hole portion that is formed in the piston and makes the gas flow from one side to another side in accordance with the difference between the pressure of the gas inside the first end space and the pressure of the gas inside the second end space, and; an auxiliary flow passage having a restricting member that allows the flow of gas in the direction from the second end space to the first end space of the chamber and restricts the flow of gas in the direction from the first end space to the second end space in the flow passage.

7 . The regeneration valve device according to claim 6 , wherein the auxiliary flow passage is formed by a clearance between the outer peripheral surface of a flange portion of the piston and the inner peripheral surface of the chamber,
the restricting member is formed by a cup seal housed in a recessed portion formed along the outer peripheral surface of the flange portion such that an opening portion faces the first end space; the cup seal enlarges and reduces the opening portion by elastic deformation; the gas flows into the first end space via the hole portion and additionally via the auxiliary flow passage due to the opening portion of the cup seal reducing to open the clearance when the gas flows from the second end space in the chamber into the first end space, and the gas flows out to the second end space only via the hole portion due to the opening portion of the cup seal enlarging to close the clearance when the gas flows out from the first end space in the chamber to the second end space.

8 . The regeneration valve device according to claim 6 , wherein the gas is delivered from the drying portion to the second end space in the chamber,
the gas delivered into the second end space flows into the first end space in the chamber, the pressure in the first end space in the chamber increases so that the piston is moved by the pressure to the second end against the urging force of the urging member and the valve is put in the open state by the movement of the piston, and by the gas in the first end space in the chamber flowing out to the second end space via the hole portion and the pressure in the first end space in the chamber decreasing due to the outflow of the gas, the urging force of the urging member moves the piston to the first end and the valve is put in the closed state by the movement of the piston.

9 . An air dryer comprising:
a drying portion having a regenerable drying agent; and a regeneration valve device connected to a first end of a flow passage in the drying portion, wherein the regeneration valve device is the regeneration valve device according to claim 6 , and a gas compressor and a gas discharge portion are connected to the second end of the flow passage in the

Assignees

• Nabtesco Automotive Corp

Inventors

• Minato Ichiro
• Sugio Takuya
• Murakami Hiroyuki
• Hasebe Hiroki

Classifications

• B01D2259/40003

  Methods relating to valve switching · CPC title

• B01D2258/06

  Polluted air · CPC title

• F01N3/0807

  by using absorbents or adsorbents · CPC title

• B01D53/0407 Primary

  Constructional details of adsorbing systems · CPC title

• B01D2259/4566

  for use in transportation means · CPC title