A three-position three-way pilot control valve for a commercial vehicle air dryer

Abstract

The invention discloses a three-position three-way type pilot control valve of an air dryer of a commercial vehicle. An unloading structure of an existing air dryer for a vehicle is complicated and difficult to manufacture and assemble; and an electric structure is introduced in the air dryer, so that the reliability is reduced. According to the three-position three-way type pilot control valve, an air inlet channel of a valve seat is communicated with an air channel structure of a piston-type valve element; each of a first spring and a second spring forms a slide pair together with a pressure-regulating cavity of a pilot valve body; the springs are connected with a first spring seat and a second spring seat; a force transmission rod is arranged between the first spring seat and the piston-type valve element; a pressure-regulating screw is used for tightly pressing the second spring seat; a valve element motion cavity is communicated with an air outlet cavity through a valve seat air guide hole formed in the pilot valve body, and a residual air cavity is communicated with the pressure-regulating cavity through a residual air outlet formed in the pilot valve body; the air outlet cavity is communicated with an unloading valve through a valve seat air outlet formed in the valve seat; and a pressure-regulating seat air outlet is formed in the pressure-regulating seat. The three-position three-way function of the pilot valve can be realized through the air channel structure and the valve seat air guide hole, and the piston-type valve element is convenient to mount.

Description

technical field

[0001] The invention belongs to the technical field of valves, and relates to a control valve, in particular to a three-position three-way pilot control valve for a commercial vehicle air dryer. Background technique

[0002] Air dryers are mainly used in the automotive field and are an important part of the automotive power control system. The function of the air dryer is to dry, degrease and filter the gas from the air compressor, and store the dried gas in the regeneration gas storage tank; when the gas storage capacity and pressure of the regeneration gas storage tank reach a certain value, unloading The valve will open to vent to avoid dangerous overpressure. However, due to the high opening pressure of the unloading valve and the large gas flow rate, most of the air dryers have problems such as loud noise and inaccurate valve opening and closing control when exhausting. Precision has a huge impact.

[0003] In order to optimize the control accuracy an...

Examples

Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, a commercial vehicle air dryer three-position three-way pilot control valve includes a valve seat 1, a filter device 2, a first sealing ring 4, a pilot valve body 5, a piston spool 6, and a second sealing ring 8. Dowel rod 9, first spring seat 10, spring 11, second spring seat 12, pressure regulating seat 13 and pressure regulating screw 14; piston type spool 6 is arranged in the closed form of pilot valve body 5 and valve seat 1 inside the spool movement chamber, and separate the spool movement chamber into an intake chamber and a residual air chamber; the tail of the piston spool 6 faces the residual air chamber, and the cylindrical surface of the tail is connected with the pilot valve body 5 to ensure The tightness between the piston spool 6 and the pilot valve body 5; the head of the piston spool 6 is conical and e...

technical field

[0001] The invention belongs to the technical field of valves, and relates to a control valve, in particular to a three-position three-way pilot control valve for a commercial vehicle air dryer. Background technique

[0002] Air dryers are mainly used in the automotive field and are an important part of the automotive power control system. The function of the air dryer is to dry, degrease and filter the gas from the air compressor, and store the dried gas in the regeneration gas storage tank; when the gas storage capacity and pressure of the regeneration gas storage tank reach a certain value, unloading The valve will open to vent to avoid dangerous overpressure. However, due to the high opening pressure of the unloading valve and the large gas flow rate, most of the air dryers have problems such as loud noise and inaccurate valve opening and closing control when exhausting. Precision has a huge impact.

[0003] In order to optimize the control accuracy an...

Examples

Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, a commercial vehicle air dryer three-position three-way pilot control valve includes a valve seat 1, a filter device 2, a first sealing ring 4, a pilot valve body 5, a piston spool 6, and a second sealing ring 8. Dowel rod 9, first spring seat 10, spring 11, second spring seat 12, pressure regulating seat 13 and pressure regulating screw 14; piston type spool 6 is arranged in the closed form of pilot valve body 5 and valve seat 1 inside the spool movement chamber, and separate the spool movement chamber into an intake chamber and a residual air chamber; the tail of the piston spool 6 faces the residual air chamber, and the cylindrical surface of the tail is connected with the pilot valve body 5 to ensure The tightness between the piston spool 6 and the pilot valve body 5; the head of the piston spool 6 is conical and e...

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