CN103591071B - A kind of pneumatic proportional pressure valve driven by linear motor - Google Patents

Abstract

A kind of pneumatic proportional pressure valve driven by linear motor, comprise linear electric motor, mover and the valve rod of linear electric motor are fixed, actuate valve stem pumps, control the position of upper valve core and lower valve core, spool forms slipper seal by seal ring and valve body and coordinates, valve rod is a multidiameter shaft, form slipper seal by seal ring and upper end cap to coordinate, move upward by shoulder promotion upper valve core or promote lower valve core and move downward, the present invention utilizes linear electric motor actuate valve stem and spool first motion, and structure is simple, transmission efficiency is high, operating range is wide; Can realize to cylinder end that pressure keeps, the switching of air inlet and exhaust, thus realize the proportion adjustment of delivery pressure; Be easy to monitoring spool real time position, build automatically controlled servo-system, the intake and exhaust flow of modulating valve, improves the dynamic performance of valve.

Description

A Linear Motor Driven Pneumatic Proportional Pressure Valve

technical field

The invention belongs to the technical field of pneumatic transmission and control, in particular to a linear motor-driven pneumatic proportional pressure valve.

Background technique

In the industrial field, especially in the field of pneumatic transmission and control, the pneumatic proportional pressure valve is widely used as a pressure regulating element in the pressure control of the air storage tank, the thrust control of the cylinder, and the flow control. Common pneumatic proportional pressure valves or electric proportional valves at home and abroad use adjustable diaphragms. By feedbacking the pressure value at the output end of the valve, the electric signal is used to control the electromagnetic pilot valve and then adjust the pressure in the diaphragm chamber to achieve a balance with the valve output pressure to achieve pneumatic pressure. Proportional regulation of valve pressure output. Due to the influence of the pressure fluctuation of the air source, the traditional pneumatic proportional pressure valve has a large difference in dynamic performance during the reversing process, and cannot actively adjust the flow area of the pneumatic valve when performing pressure control, that is, to achieve flow control, and when the pneumatic After the valve output pressure reaches a stable level, there will still be small fluctuations, and a certain amount of compressed air will be consumed. The control accuracy of the traditional pneumatic proportional pressure valve mainly depends on the specially designed electromagnetic pilot valve, which has high cost and low action sensitivity, and mainly depends on the import. In addition, the overall structure of the valve is complicated due to the diaphragm structure, which is resistant to oil in the compressed air. The ability to pollute water is poor, and the performance of resisting vibration and shock in the use of machine tools is low, especially in the case of large diameter or harsh working conditions, the failure rate is high and the reliability is poor.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a linear motor-driven pneumatic proportional pressure valve, which can drive the valve core to move through the linear motor and control the position of the valve core, thereby realizing the ratio of the output pressure of the valve. regulation and intake and exhaust flow control.

In order to achieve the above object, the technical scheme that the present invention takes is:

A linear motor-driven pneumatic proportional pressure valve, including a linear motor 1, the linear motor 1 is fixed on the upper end surface of the upper end cover 3, the upper end cover 3 and the lower end cover 9 are respectively fixedly connected with the valve body 5, and sealed by a sealing ring, the linear The motor 1 includes a stator 2 and a mover 17, the mover 17 is connected to the upper end of the valve stem 12, the valve body 5 is provided with an air inlet 6, a cylinder output port 11 and an exhaust port 13, an upper valve core 4 and a lower valve core 7 The outer side forms a sliding and sealing fit with the valve body 5 through the first sealing ring 15 and the second sealing ring 8. The upper valve core 4 and the lower valve core 7 are hollow structures, and the valve stem 12 is inserted from the middle with a gap to balance the valve core. pressure on the upper and lower sides,

The valve stem 12 is a stepped shaft, which forms a sliding and sealing fit with the upper end cover 3 through the third sealing ring 16, and pushes the upper valve core 4 to move upward or the lower valve core 7 to move downward through the shoulder;

When the linear motor 1 keeps the zero position and has no output, the upper spool 4 and the lower spool 7 form a contact seal with the valve body 5 through the first return spring 14 and the second return spring 10, and the cylinder output port 11 and the air inlet 6, The exhaust ports 13 are all closed; when the linear motor 1 drives the valve rod 12 to move downward, the upper valve core 4 is closed with the valve body 5 under the action of the first return spring 14, and the cylinder output port 11 and the exhaust port 13 are closed. The lower spool 7 is separated from the valve body 5 under the push of the valve stem 12, and the output port 11 of the cylinder communicates with the air inlet 6; Closed with the valve body 5 under the action of the valve, the cylinder output port 11 is closed with the air inlet 6, the upper valve core 4 is separated from the valve body 5 under the promotion of the valve stem 12, and the cylinder output port 11 is communicated with the exhaust port 13.

A pressure sensor is set at the output port 11 of the cylinder to feed back the pressure at the cylinder end, and then drive the linear motor 1 to move, to maintain the pressure at the cylinder end, to operate air intake and exhaust, and to realize the proportional adjustment of the valve output pressure.

The linear motor 1 is equipped with a linear displacement sensor, and the linear displacement sensor feeds back the position signal of the mover 17 or the valve stem 12, so as to perform closed-loop adjustable control on the position and movement speed of the valve core, so as to realize the inlet and outlet of the valve. Air flow control.

The essence of the technical solution of the present invention is to use a linear motor to directly drive the valve stem and the valve core to perform linear motion, so as to realize the precise control of the position and movement speed of the valve core and achieve the reversing of the control valve, the proportional adjustment of the cylinder end pressure and the intake and exhaust flow. purpose of control.

Compared with the prior art, the present invention has the following advantages: the direct movement of the valve rod and the valve core is driven by a linear motor, the structure is simple, the transmission efficiency is high, and the working range is wide; the pressure maintenance, air intake and exhaust can be realized on the cylinder end. Switching, so as to realize the proportional adjustment of the output pressure; it is easy to monitor the real-time position of the valve core, build an electronically controlled servo system, adjust the intake and exhaust flow of the valve, and improve the dynamic performance of the valve.

Description of drawings

Accompanying drawing is the structural representation of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in the accompanying drawings, a linear motor-driven pneumatic proportional pressure valve includes a linear motor 1, the linear motor 1 is fixed on the upper end surface of the upper end cover 3, the upper end cover 3 and the lower end cover 9 are respectively fixedly connected with the valve body 5, and Sealed by a sealing ring, the linear motor 1 includes a stator 2 and a mover 17. The mover 17 is connected to the upper end of the valve stem 12 to drive the valve stem 12 to reciprocate up and down. The valve body 5 is provided with an air inlet 6, a cylinder output port 11 and The exhaust port 13, the outer side of the upper valve core 4 and the lower valve core 7 form a sliding and sealing cooperation with the valve body 5 through the first sealing ring 15 and the second sealing ring 8, and the upper valve core 4 and the lower valve core 7 are hollow structures. The valve stem 12 is inserted from the middle and has a gap to balance the pressure on the upper and lower sides of the valve core,

The valve stem 12 is a stepped shaft, which forms a sliding and sealing fit with the upper end cover 3 through the third sealing ring 16, and pushes the upper valve core 4 to move upward or the lower valve core 7 to move downward through the shoulder;

When the linear motor 1 keeps the zero position and has no output, the upper spool 4 and the lower spool 7 form a contact seal with the valve body 5 through the first return spring 14 and the second return spring 10, and the cylinder output port 11 and the air inlet 6, The exhaust ports 13 are all closed; when the linear motor 1 drives the valve rod 12 to move downward, the upper valve core 4 is closed with the valve body 5 under the action of the first return spring 14, and the cylinder output port 11 and the exhaust port 13 are closed. The lower spool 7 is separated from the valve body 5 under the push of the valve stem 12, and the output port 11 of the cylinder communicates with the air inlet 6; Closed with the valve body 5 under the action of the valve, the cylinder output port 11 is closed with the air inlet 6, the upper valve core 4 is separated from the valve body 5 under the promotion of the valve stem 12, and the cylinder output port 11 is communicated with the exhaust port 13.

A pressure sensor is set at the output port 11 of the cylinder to feed back the pressure at the cylinder end, and then drive the linear motor 1 to move, to maintain the pressure at the cylinder end, to operate air intake and exhaust, and to realize the proportional adjustment of the valve output pressure.

The linear motor 1 is equipped with a linear displacement sensor, and the linear displacement sensor feeds back the position signal of the mover 17 or the valve stem 12, so as to perform closed-loop adjustable control on the position and movement speed of the valve core, so as to realize the inlet and outlet of the valve. Air flow control.

Working principle of the present invention is:

A pressure sensor can be installed at the output port 11 of the cylinder to feed back the pressure at the cylinder end and drive the linear motor 1 to move to realize the pressure maintenance at the cylinder end, air intake and exhaust, etc., so as to realize the proportional adjustment of the valve output pressure. When the pressure at the output port 11 of the cylinder is equal to the set pressure value, the linear motor 1 maintains the zero position and has no output, and the upper valve core 4 and the lower valve core 7 form a contact seal with the valve body 5 through the first return spring 14 and the second return spring 10 , the cylinder output port 11 is closed with the air inlet 6 and the exhaust port 13, and the pressure at the cylinder output port 11 remains unchanged; when the pressure at the cylinder output port 11 is lower than the set pressure value, the linear motor 1 drives the valve stem 12 downward When moving, the upper valve core 4 is closed with the valve body 5 under the action of the first return spring 13, the cylinder output port 11 is closed with the exhaust port 13, and the lower valve core 7 is separated from the valve body 5 under the push of the valve stem 12. The output port 11 of the cylinder communicates with the intake port 6, and the pressure of the output port 11 of the cylinder increases; when the pressure at the output port 11 of the cylinder is higher than the set pressure value, when the linear motor 1 drives the valve stem 12 to move upward, the lower valve core 7 The valve body 5 is closed under the action of the return spring 10, the cylinder output port 11 is closed with the air inlet 6, the upper valve core 4 is separated from the valve body 5 under the push of the valve stem 12, and the cylinder output port 11 is connected with the exhaust port 13. Connected, the pressure at the output port 11 of the cylinder decreases. During intake and exhaust control, the linear motor 1 can change the position and movement speed of the upper spool 4 or the lower spool 7 through the valve rod 12 to realize the flow control of the intake and exhaust of the valve.

Claims (3)

1. a pneumatic proportional pressure valve driven by linear motor, comprise linear electric motor (1), it is characterized in that: linear electric motor (1) are fixed on the upper-end surface of upper end cap (3), upper end cap (3) is fixedly connected with valve body (5) respectively with lower end cap (9), and sealed by seal ring, linear electric motor (1) comprise stator (2) and mover (17), mover (17) is connected with the upper end of valve rod (12), valve body (5) is provided with suction port (6), cylinder delivery outlet (11) and relief opening (13), upper valve core (4) outside forms slipper seal by the first seal ring (15) with valve body (5) and coordinates, lower valve core (7) outside forms slipper seal by the second seal ring (8) with valve body (5) and coordinates, the structure that upper valve core (4) and lower valve core (7) are hollow, valve rod (12) therefrom between insert and there is gap, thus the pressure of balance valve core upper and lower sides,

Valve rod (12) is a multidiameter shaft, form slipper seal by the 3rd seal ring (16) with upper end cap (3) to coordinate, promote upper valve core (4) by shoulder and move upward or promote lower valve core (7) and move downward;

When linear electric motor (1) keep zero-bit not export, upper valve core (4) and lower valve core (7) are formed to contact with valve body (5) by the first Returnning spring (14) and the second Returnning spring (10) and seal, and cylinder delivery outlet (11) and suction port (6), relief opening (13) are all closed; When linear electric motor (1) actuate valve stem (12) moves downward, upper valve core (4) closes with valve body (5) under the effect of the first Returnning spring (14), cylinder delivery outlet (11) is closed with relief opening (13), lower valve core (7) separates with valve body (5) under the promotion of valve rod (12), and cylinder delivery outlet (11) is communicated with suction port (6); When linear electric motor (1) actuate valve stem (12) moves upward, lower valve core (7) closes with valve body (5) under the effect of the second Returnning spring (10), cylinder delivery outlet (11) is closed with suction port (6), upper valve core (4) separates with valve body (5) under the promotion of valve rod (12), and cylinder delivery outlet (11) is communicated with relief opening (13).

2. a kind of pneumatic proportional pressure valve driven by linear motor according to claim 1, it is characterized in that: described cylinder delivery outlet (11) place arranges pressure transducer, feedback cylinder end pressure, and then drive linear electric motor (1) motion, realize the maintenance of cylinder end pressure, air inlet and bleeding, to realize the proportion adjustment of valve delivery pressure.

3. a kind of pneumatic proportional pressure valve driven by linear motor according to claim 1, it is characterized in that: in described linear electric motor (1), be configured with linear displacement transducer, the position signal of mover (17) or valve rod (12) is fed back by linear displacement transducer, thus valve element position and movement velocity are carried out to the adjustable control of closed loop, to realize the intake and exhaust flow control of valve.