CN209818863U - Linear motor valve positioner - Google Patents
Linear motor valve positioner Download PDFInfo
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- CN209818863U CN209818863U CN201920382085.2U CN201920382085U CN209818863U CN 209818863 U CN209818863 U CN 209818863U CN 201920382085 U CN201920382085 U CN 201920382085U CN 209818863 U CN209818863 U CN 209818863U
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- linear motor
- pneumatic
- output
- rotating shaft
- push rod
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Abstract
The utility model discloses a linear motor valve positioner, which comprises a CPU control circuit, wherein the CPU control circuit is connected with a linear motor and outputs a current signal to the linear motor; an output shaft of the linear motor is connected with a slide valve core in the pneumatic amplifier, and the slide valve core is driven by the output shaft to do linear reciprocating mechanical motion; the linear motor is connected with a stroke adjusting piece, and the stroke adjusting piece is used for adjusting the axial reciprocating displacement of an output shaft in the linear motor; the pneumatic amplifier is provided with an output pneumatic channel, an air source channel and an emptying channel, and is connected with the pneumatic control valve through the output pneumatic channel and outputs a pneumatic signal to an actuating mechanism of the pneumatic control valve; the displacement sensor is connected with a push rod of the actuating mechanism and moves along with the reciprocating movement of the push rod, and the displacement sensor converts the displacement of the push rod into an electric signal and feeds the electric signal back to the CPU control circuit. The position of the valve can be correctly positioned according to a given input signal by feeding back according to the displacement of the push rod of the pneumatic actuating mechanism.
Description
Technical Field
The utility model relates to a linear electric motor valve locator belongs to linear electric motor valve field.
Background
The valve positioner is a main accessory of the control valve and plays a role in positioning the valve, so that the position of the valve can be correctly positioned according to input signals of the valve positioner given by a control system. At present, DCS is increasingly used on site, and a plurality of controllers are controllers of a central control system, so that 4-20mA electric signals are used for controlling the DCS to the site, and the DCS needs to be fast and accurate in valve action to the site.
Because most common electric valve positioners work by adopting a mechanical force balance principle, too many mechanical moving parts are easily influenced by temperature and vibration to cause fluctuation of a control valve; in addition, the spring constant of the spring can change in a severe field, which causes the nonlinearity of the control valve to reduce the control quality.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a linear electric motor valve locator makes the valve position can correctly fix a position according to given input signal.
In order to achieve the purpose, the linear motor valve positioner adopted by the utility model comprises a CPU control circuit, wherein the CPU control circuit is connected with a linear motor and outputs a current signal to the linear motor;
an output shaft of the linear motor is connected with a slide valve core in the pneumatic amplifier, and the slide valve core is driven by the output shaft to do linear reciprocating mechanical motion; the linear motor is connected with a stroke adjusting piece, and the stroke adjusting piece is used for adjusting the axial reciprocating displacement of an output shaft in the linear motor;
the pneumatic amplifier is connected with the pneumatic control valve through the output pneumatic channel and outputs a pneumatic signal to an actuating mechanism of the pneumatic control valve; the displacement sensor is connected with a push rod of the actuating mechanism and moves along with the reciprocating movement of the push rod, and the displacement sensor converts the displacement of the push rod into an electric signal and feeds the electric signal back to the CPU control circuit.
As an improvement, the CPU control circuit is provided with two input connecting terminals and a direct current output terminal.
As an improvement, the linear motor is provided with four power supply outgoing lines, and the power supply outgoing lines are connected with a direct current output end of the CPU control circuit through a lead and used for receiving a direct current signal output by the CPU control circuit;
the linear motor converts the received direct current signal into linear reciprocating mechanical motion of the output shaft.
As an improvement, the output end of the output shaft is processed with threads, and the output shaft is connected with a slide valve core of the pneumatic amplifier through a connecting sleeve.
As an improvement, the connecting sleeve is cylindrical, and threads are machined on the inner surface of the connecting sleeve.
As an improvement, the pneumatic amplifier comprises a two-position three-way type pneumatic amplifier and a three-position five-way type pneumatic amplifier, the two-position three-way type pneumatic amplifier is matched with the single-action pneumatic actuating mechanism for use, and the three-position five-way type pneumatic amplifier is matched with the double-action pneumatic actuating mechanism for use.
As an improvement, the two-position three-way type pneumatic amplifier is provided with an air source channel for connecting an air source, an output air pressure channel for outputting an air pressure signal to an actuating mechanism membrane chamber of the pneumatic control valve and an emptying channel for emptying;
the three-position five-way type pneumatic amplifier is provided with an air source channel for connecting an air source, two output air pressure channels for outputting air pressure signals to the actuating mechanism membrane chamber of the pneumatic control valve and two emptying channels for emptying.
As an improvement, the displacement sensor comprises a feedback plate I, a rolling shaft, a feedback plate II, a rotating shaft, a gear I, a gear II, a potentiometer and a potentiometer rotating shaft;
a feedback plate II is fixed at the outer end of the rotating shaft, a rolling shaft is connected to the feedback plate II, the rolling shaft is connected with a feedback plate I, and the feedback plate I is fixed on a push rod of an actuating mechanism of the pneumatic control valve; a gear I is mounted at the inner end of the rotating shaft, one end of the potentiometer rotating shaft is connected with a gear II meshed with the gear I, and a potentiometer is fixed at the other end of the potentiometer rotating shaft;
the feedback plate I moves along with the reciprocating movement of the push rod, and converts the displacement of the push rod into an electric signal through a potentiometer and feeds the electric signal back to the CPU control circuit.
As an improvement, the reference circle diameter of the gear I is larger than that of the gear II.
As an improvement, one end of the feedback plate II, which is connected with the rotating shaft, is bent into a U shape, a connecting hole for the rotating shaft to penetrate through is formed in the bent end of the U shape, the shape of the shaft end of the rotating shaft is matched with that of the connecting hole, and the connecting hole drives the rotating shaft to rotate.
Compared with the prior art, the utility model discloses a linear electric motor valve locator has following beneficial effect:
1) the parts with reduced performance and shortened mechanical life are removed, and the influence of temperature and vibration is small when the working condition is severe.
2) The linear relationship between the input signal and the stroke of the control valve can be well maintained without adopting a spring and a cam for position feedback.
3) The linear motor has good positioning precision and repeatability, and the linear motor has no contact and abrasion because of the installation gap between the moving part and the fixed part, and has no influence on the movement positioning precision after being used for a long time.
4) The linear motor has zero return clearance and flexibility, and the speed of the output shaft driving the slide valve core of the pneumatic amplifier is very stable.
5) The unbalanced force of liquid to the valve core can be overcome, and the stroke error is reduced. The time lag caused by the friction force between the valve rod and the packing can be overcome; the resistance of the medium to the movement of the valve stem can be overcome.
6) Even if the working condition is changed frequently, the performance of the control valve is still stable, and the positioning accuracy and the reliability of the control valve are improved.
7) Can be used in various industrial automation process control fields.
Drawings
FIG. 1 is a schematic diagram of a linear motor valve positioner according to the present invention;
FIG. 2 is a schematic diagram of the double-acting linear motor valve positioner of the present invention;
FIG. 3 is a first schematic view of the linear motor valve positioner of the present invention;
fig. 4 is a second schematic view of the installation of the linear motor valve positioner of the present invention;
in the figure: 1. the device comprises a CPU control circuit, 2, a linear motor, 3, a stroke adjusting part, 4, a connecting sleeve, 5, a pneumatic amplifier, 5-1, a sliding valve core, 6, a displacement sensor, 6-1, a feedback plate I, 6-2, a rolling shaft, 6-3, a feedback plate II, 6-4, a rotating shaft, 6-5, a gear I, 6-6, a gear II, 6-7, a potentiometer, 6-8, a potentiometer rotating shaft, 7, a pneumatic control valve, 8, 4-20mA input signals, 9, a direct current output end, 10, an air source channel, 11 and an emptying channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
As shown in fig. 1, 2 and 3, a linear motor valve positioner comprises a CPU control circuit 1, wherein the CPU control circuit 1 is connected with a linear motor 2 and outputs a current signal to the linear motor 2;
an output shaft of the linear motor 2 is connected with a slide valve core 5-1 in the pneumatic amplifier 5, and the slide valve core 5-1 is driven by the output shaft to do linear reciprocating mechanical motion; the linear motor 2 is connected with the stroke adjusting piece 3, and the stroke adjusting piece 3 is used for adjusting the axial reciprocating displacement of an output shaft in the linear motor 2;
the pneumatic amplifier 5 is provided with an output air pressure channel, an air source channel 10 and an emptying channel 11, and the pneumatic amplifier 5 is connected with the pneumatic control valve 7 through the output air pressure channel and outputs an air pressure signal to an actuating mechanism of the pneumatic control valve 7; the displacement sensor 6 is connected with a push rod of the actuating mechanism and moves along with the reciprocating movement of the push rod, and the displacement sensor 6 converts the displacement of the push rod into an electric signal and feeds the electric signal back to the CPU control circuit 1.
As a modification of the embodiment, the CPU control circuit 1 is provided with two input terminals, one is used for receiving a 4-20mA input signal 8, and the other is used for receiving a feedback valve position electric signal from the displacement sensor 6; a dc output 9 is also provided for outputting dc current to the linear motor 2.
As an improvement of the embodiment, the linear motor 2 has four power supply outgoing lines, and the power supply outgoing lines are connected with a direct current output end 9 of the CPU control circuit 1 through a lead and used for receiving a direct current signal output by the CPU control circuit 1;
the linear motor 2 converts the received direct current signal into a linear reciprocating mechanical motion of the output shaft without any intermediate conversion mechanism.
As an improvement of the embodiment, the output end of the output shaft is processed with threads, and the output shaft is connected with a slide valve core 5-1 of a pneumatic amplifier 5 through a connecting sleeve 4. In a further improvement, the connecting sleeve 4 is cylindrical, threads are machined on the inner surface of the connecting sleeve 4, and the output shaft of the linear motor 2 is reliably in threaded connection with the sliding valve core 5-1 of the pneumatic amplifier 5.
As shown in fig. 1 and 2, the pneumatic amplifier 5 includes a two-position three-way pneumatic amplifier and a three-position five-way pneumatic amplifier, the two-position three-way pneumatic amplifier is used in cooperation with the single-acting pneumatic actuator, and the three-position five-way pneumatic amplifier is used in cooperation with the double-acting pneumatic actuator.
As an improvement of the embodiment, the two-position three-way type pneumatic amplifier is provided with an air source channel 10 for connecting an air source, an output air pressure channel for outputting an air pressure signal to an actuating mechanism membrane chamber of the pneumatic control valve 7 and a vent channel 11 for venting;
the three-position five-way type pneumatic amplifier 5 is provided with an air source channel 10 for connecting an air source, two output pneumatic channels for outputting pneumatic signals to the actuating mechanism diaphragm chamber of the pneumatic control valve 7 and two emptying channels 11 for emptying.
As a modification of the embodiment, as shown in FIG. 4, the displacement sensor 6 comprises a feedback plate I6-1, a roller 6-2, a feedback plate II 6-3, a rotating shaft 6-4, a gear I6-5, a gear II 6-6, a potentiometer 6-7 and a potentiometer rotating shaft 6-8;
a feedback plate II 6-3 is fixed at the outer end of the rotating shaft 6-4, a roller 6-2 is connected to the feedback plate II 6-3, the roller 6-2 is connected with a feedback plate I6-1, and the feedback plate I6-1 is fixed on a push rod of an actuating mechanism of the pneumatic control valve 7; a gear I6-5 is mounted at the inner end of the rotating shaft 6-4, one end of a potentiometer rotating shaft 6-8 is connected with a gear II 6-6 meshed with the gear I6-5, and a potentiometer 6-7 is fixed at the other end of the potentiometer rotating shaft 6-8;
the feedback plate I6-1 moves along with the reciprocating movement of the push rod, and the displacement of the push rod is converted into an electric signal through the potentiometer 6-7 and fed back to the CPU control circuit 1.
As an improvement of the embodiment, the reference circle diameter of the gear I6-5 is larger than that of the gear II 6-6.
As an improvement of the embodiment, one end of the feedback plate II 6-3, which is connected with the rotating shaft 6-4, is bent into a U shape, a connecting hole for the rotating shaft 6-4 to penetrate through is formed in the U-shaped bent end, the shape of the shaft end of the rotating shaft 6-4 is matched with that of the connecting hole, and the connecting hole drives the rotating shaft 6-4 to rotate.
When a given input signal is increased, an output current signal output to the linear motor 2 by the CPU control circuit 1 is in a positive direction, an output shaft of the linear motor 2 axially displaces upwards to drive a slide valve core 5-1 of the pneumatic amplifier 5 to move upwards, at the moment, the air source channel 10 is communicated with the output channel of the positioner, air source pressure enters an actuating mechanism membrane chamber of the pneumatic control valve 7, a spring in the actuating mechanism membrane chamber is compressed under the action of the air source pressure to drive a push rod to displace (downwards), a feedback plate I6-1 of a position sensor 6 fixed on the push rod displaces along with the push rod, the feedback plate I6-1 drives a feedback plate II 6-3 to rotate through a roller 6-2, a rotating shaft 6-4 fixed with the feedback plate II 6-3 rotates along with the rotating shaft, and simultaneously drives a gear I6-5 to synchronously rotate, the gear I6-5 drives the gear II 6-6 to rotate, the gear II 6-6 drives the potentiometer rotating shaft 6-8 to rotate, and the potentiometer 6-7 converts the detected position change into an electric signal to be fed back to the CPU control circuit 1;
when a given input signal is reduced, an output current signal output to a linear motor 2 by a CPU control circuit 1 is in the opposite direction, an output shaft of the linear motor 2 axially displaces downwards so as to drive a slide valve core of a pneumatic amplifier 5 to move downwards, the pressure of an air source cannot enter a control valve diaphragm chamber, an emptying channel 11 is communicated with an output channel of a positioner, the pressure of the control valve diaphragm chamber is reduced along with the displacement, a push rod displaces (moves upwards) under the action of a spring force in an actuating mechanism diaphragm chamber, a feedback plate I6-1 of a position sensor 6 fixed on the push rod displaces along with the push rod, the feedback plate I6-1 drives a feedback plate II 6-3 to rotate through a roller 6-2, a rotating shaft 6-4 fixed with the feedback plate II 6-3 rotates along with the rotating shaft, simultaneously drives a gear I6-5 to synchronously rotate, and the gear I6-5 drives the gear II 6-6 to rotate, the gear II 6-6 drives the potentiometer rotating shaft 6-8 to rotate, and the potentiometer 6-7 converts the detected position change into an electric signal to be fed back to the CPU control circuit 1.
The CPU control circuit 1 compares the actual valve position feedback electric signal from the displacement sensor 6 with the set 4-20mA input signal, and changes the output direct current of the linear motor 2 according to the deviation size and direction after detecting the deviation, thereby controlling the output air pressure entering the pneumatic actuating mechanism and ensuring that the stroke of the control valve corresponds to the 4-20mA input signal one by one.
The utility model discloses the stroke of debugging linear electric motor valve locator, given input signal (4mA) when adjusting zero point, if the valve position pointer instruction is not on the zero bit, adjust stroke adjusting part 3 on the valve locator, make the valve position pointer instruct the zero bit. After zero calibration, given the input signals 8mA, 12mA, 16mA and 20mA, respectively, the valve position pointers should point to 25%, 50%, 75% and 100%, respectively. If the indication is not accurate, the stroke adjusting piece 3 is adjusted, and the indication can be accurate.
The utility model discloses a given input signal is through control circuit output direct current signal and drive linear electric motor output shaft and be reciprocating mechanical motion, and then control pneumatic amplifier to the gas signal of pneumatic actuator output, control flap's action. Meanwhile, feedback is carried out according to the displacement of the push rod of the pneumatic actuating mechanism, so that the position of the valve can be correctly positioned according to a given input signal.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. The linear motor valve positioner is characterized by comprising a CPU control circuit (1), wherein the CPU control circuit (1) is connected with a linear motor (2) and outputs a current signal to the linear motor (2);
an output shaft of the linear motor (2) is connected with a slide valve core (5-1) in the pneumatic amplifier (5), and the slide valve core (5-1) is driven by the output shaft to do linear reciprocating mechanical motion; the linear motor (2) is connected with the stroke adjusting piece (3), and the stroke adjusting piece (3) is used for adjusting the axial reciprocating displacement of an output shaft in the linear motor (2);
the pneumatic amplifier (5) is provided with an output air pressure channel, an air source channel (10) and an emptying channel (11), and the pneumatic amplifier (5) is connected with the pneumatic control valve (7) through the output air pressure channel and outputs an air pressure signal to an actuating mechanism of the pneumatic control valve (7); the displacement sensor (6) is connected with a push rod of the actuating mechanism and moves along with the reciprocating movement of the push rod, and the displacement sensor (6) converts the displacement of the push rod into an electric signal and feeds the electric signal back to the CPU control circuit (1).
2. Linear motor valve positioner according to claim 1, characterised in that the CPU control circuit (1) has two input terminals and is further provided with a dc current output (9).
3. The linear motor valve positioner according to claim 1, wherein the linear motor (2) has four power supply lead-out wires, and the power supply lead-out wires are connected with a direct current output end (9) of the CPU control circuit (1) through a lead and used for receiving a direct current signal output by the CPU control circuit (1);
the linear motor (2) converts the received direct current signal into linear reciprocating mechanical motion of an output shaft.
4. The linear motor valve positioner according to claim 1, wherein the output end of the output shaft is threaded, and the output shaft is connected with a spool (5-1) of a pneumatic amplifier (5) through a connecting sleeve (4).
5. The linear motor valve positioner according to claim 4, wherein the connecting sleeve (4) is cylindrical, and threads are machined on the inner surface of the connecting sleeve (4).
6. The linear motor valve positioner according to claim 1, characterised in that the pneumatic amplifier (5) comprises a two-position three-way type pneumatic amplifier and a three-position five-way type pneumatic amplifier, the two-position three-way type pneumatic amplifier being used in cooperation with a single-acting pneumatic actuator and the three-position five-way type pneumatic amplifier being used in cooperation with a double-acting pneumatic actuator.
7. The linear motor valve positioner according to claim 6, wherein the two-position three-way type pneumatic amplifier is provided with an air source channel (10) for connecting an air source, an output pneumatic channel for outputting a pneumatic signal to an actuator diaphragm chamber of the pneumatic control valve (7), and a vent channel (11) for venting;
the three-position five-way type pneumatic amplifier (5) is provided with an air source channel (10) used for connecting an air source, two output air pressure channels used for outputting air pressure signals to the actuating mechanism membrane chamber of the pneumatic control valve (7) and two emptying channels (11) used for emptying.
8. The linear motor valve positioner according to claim 1, wherein the displacement sensor (6) comprises a feedback plate i (6-1), a roller (6-2), a feedback plate ii (6-3), a rotating shaft (6-4), a gear i (6-5), a gear ii (6-6), a potentiometer (6-7) and a potentiometer rotating shaft (6-8);
a feedback plate II (6-3) is fixed at the outer end of the rotating shaft (6-4), a rolling shaft (6-2) is connected onto the feedback plate II (6-3), the rolling shaft (6-2) is connected with a feedback plate I (6-1), and the feedback plate I (6-1) is fixed onto a push rod of an actuating mechanism of the pneumatic control valve (7); a gear I (6-5) is installed at the inner end of the rotating shaft (6-4), one end of the potentiometer rotating shaft (6-8) is connected with a gear II (6-6) meshed with the gear I (6-5), and the other end of the potentiometer rotating shaft (6-8) is fixedly provided with a potentiometer (6-7);
the feedback plate I (6-1) moves along with the reciprocating movement of the push rod, and the displacement of the push rod is converted into an electric signal through a potentiometer (6-7) and fed back to the CPU control circuit (1).
9. The linear motor valve positioner of claim 8, wherein the gear i (6-5) has a larger pitch diameter than the gear ii (6-6).
10. The linear motor valve positioner according to claim 8 or 9, wherein one end of the feedback plate ii (6-3) connected with the rotating shaft (6-4) is bent into a U shape, a connecting hole for the rotating shaft (6-4) to pass through is formed in the bent end of the U shape, the shape of the shaft end of the rotating shaft (6-4) is matched with the shape of the connecting hole, and the connecting hole drives the rotating shaft (6-4) to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920382085.2U CN209818863U (en) | 2019-03-25 | 2019-03-25 | Linear motor valve positioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920382085.2U CN209818863U (en) | 2019-03-25 | 2019-03-25 | Linear motor valve positioner |
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| Publication Number | Publication Date |
|---|---|
| CN209818863U true CN209818863U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920382085.2U Active CN209818863U (en) | 2019-03-25 | 2019-03-25 | Linear motor valve positioner |
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| CN (1) | CN209818863U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109780296A (en) * | 2019-03-25 | 2019-05-21 | 徐州化工机械有限公司 | A kind of linear motor valve positioner |
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2019
- 2019-03-25 CN CN201920382085.2U patent/CN209818863U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109780296A (en) * | 2019-03-25 | 2019-05-21 | 徐州化工机械有限公司 | A kind of linear motor valve positioner |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210809 Address after: 221001 No. 2, anda Road, Xuzhou Economic and Technological Development Zone, Jiangsu Province Patentee after: Jiangsu Juneng measurement and Control Technology Co.,Ltd. Address before: 221007 No. 49, Meigang Road, Dibei, Xuzhou, Jiangsu Patentee before: XUZHOU CHEMICAL MACHINERY Co.,Ltd. |
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| TR01 | Transfer of patent right |