Novel intelligent valve positioner

Abstract

The utility model relates to the technical field of intelligent valve positioners, and provides a novel intelligent valve positioner which comprises a shell, a pneumatic relay is fixedly arranged on the upper portion of the shell, a pneumatic control cavity is formed in the lower surface of the pneumatic relay, an electric cavity is formed in the lower portion of an inner cavity of the shell, and an anti-explosion mechanism is arranged between the pneumatic control cavity and the electric cavity. The explosion-proof mechanism comprises an explosion-proof air gap ring and an explosion-proof air gap column, the explosion-proof air gap ring and the explosion-proof air gap column are arranged at the two ends of an inner cavity of the explosion-proof mechanism respectively, a venting plug is fixedly arranged on the lower surface of the explosion-proof mechanism, and a venting spring is fixedly arranged on the lower surface of the venting plug. When the discharge pressure of the air control cavity reaches a certain value, the exhaust spring is compressed, the soft exhaust plug realizes exhaust, and the structure ensures that the air control cavity is always in a micro-positive pressure state, so that external water, steam and other dirt are prevented from entering the air control cavity, and the reliable field work of the positioner is greatly ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent valve positioner technical field especially relates to a novel intelligent valve positioner. BACKGROUND

[0002] Intelligent valve positioner is a kind of closed-loop intelligent control system with feedback, when positioner is in normal working condition, current signal from control room is sampled and is handled by single-chip microcomputer, and single-chip microcomputer exports voltage to electrical conversion component by the D / A module unit of self-contained, and control unit with single-chip microcomputer as core samples feedback signal, and after handling feedback signal, it is compared with input signal, to constantly adjust until actuator reaches ideal position.

[0003] For example, when the housing or housing cover is open, more kinds of operations can be used.

[0004] However, in the prior art, the external water vapor, pollutants can enter the pneumatic control cavity in the long-term use of the traditional intelligent valve positioner, so that dust, oil stains exist inside the pneumatic control cavity, affect the normal use of the positioner, thereby causing the practicability of the device to be limited to a certain extent. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of novel intelligent valve positioners, including shell, the upper position of the shell is fixedly arranged with pneumatic relay, the lower surface of the pneumatic relay is provided with pneumatic control cavity, the lower position of the shell inner cavity is provided with electrical cavity, pneumatic control cavity and electrical cavity are provided with explosion-proof mechanism, the explosion-proof mechanism includes explosion-proof air gap ring and explosion-proof air gap column, the explosion-proof air gap ring and explosion-proof air gap column are respectively arranged in the both ends of the explosion-proof mechanism inner cavity.

[0006] To achieve the above object, the utility model adopts the following technical scheme: a kind of novel intelligent valve positioner, including shell, the upper position of the shell is fixedly arranged with pneumatic relay, the lower surface of the pneumatic relay is provided with pneumatic control cavity, the lower position of the shell inner cavity is provided with electrical cavity, pneumatic control cavity and electrical cavity are provided with explosion-proof mechanism, the explosion-proof mechanism includes explosion-proof air gap ring and explosion-proof air gap column, the explosion-proof air gap ring and explosion-proof air gap column are respectively arranged in the both ends of the explosion-proof mechanism inner cavity.

[0007] As a preferred implementation, the lower surface of the explosion-proof mechanism is fixedly provided with exhaust plug, and the lower surface of the exhaust plug is fixedly provided with exhaust spring.

[0008] As a preferred implementation, the outer side wall of the shell is fixedly provided with a junction box component.

[0009] As a preferred implementation, one side of the upper position of the shell cavity is fixedly provided with a proportional piezoelectric electrical conversion component, and the other side of the upper position of the shell cavity is fixedly provided with a position feedback component.

[0010] As a preferred implementation, one end of the proportional piezoelectric electrical conversion component is electrically connected with an electric control board assembly, the output end of the position feedback component is electrically connected with an electric control unit, and the input end of the electric control unit is electrically connected with the proportional piezoelectric electrical conversion component.

[0011] As a preferred implementation, the position feedback component comprises a position reversing gear, a potentiometer gear and an anti-backlash spring, the position reversing gear is connected in mesh with the potentiometer gear, and the anti-backlash spring is fixedly arranged at a position below the surface of the potentiometer gear.

[0012] As a preferred implementation, the proportional piezoelectric electrical conversion component adopts a proportional control gas path electrical conversion principle.

[0013] Compared with the prior art, the utility model has the advantages and positive effects that:

[0014] The proportional piezoelectric electrical conversion component is adopted to replace the traditional electrical conversion principle based on a coil component and a nozzle baffle, and is also different from another electrical conversion principle of adopting a switch type piezoelectric ceramic valve - pulse control gas path.

[0015] The structure of the explosion-proof air gap ring combined with the explosion-proof air gap column is adopted between the electrical cavity and the gas control cavity, so that the control gas of the electrical conversion component is not lost during transmission to the pneumatic relay.

[0016] When the discharge pressure of the gas control cavity reaches a certain value, the exhaust spring is compressed, and the soft exhaust plug realizes exhaust.

[0017] The adjustable gear pair structure is adopted and is composed of a position reversing gear and a potentiometer gear, so that the position feedback of the positioner is more convenient, the installation condition of the positioner is reduced, the anti-backlash spring ensures reliable transmission of the gear, and the transmission gap between the gears is eliminated. Attached Figure Description

[0018] Fig. 1 A schematic diagram of the internal structure of a novel intelligent valve positioner provided by this utility model;

[0019] Fig. 2 A schematic diagram of the explosion-proof mechanism structure of a novel intelligent valve positioner provided by this utility model;

[0020] Fig. 3 A schematic diagram of the position feedback component of a novel intelligent valve positioner provided by this utility model;

[0021] Legend:

[0022] 1. Housing; 2. Pneumatic relay; 3. Pneumatic control chamber; 4. Position feedback component; 5. Proportional piezoelectric electrical conversion component; 6. Electrical control board assembly; 7. Electrical chamber; 8. Junction box assembly; 9. Explosion-proof air gap ring; 10. Explosion-proof air gap column; 11. Exhaust plug; 12. Exhaust spring; 13. Positioning gear; 14. Potentiometer gear; 15. Backlash elimination spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figs. 1-3 This utility model provides a technical solution: a novel intelligent valve positioner, comprising a housing 1, characterized in that: a pneumatic relay 2 is fixedly disposed at the upper position of the housing 1, a pneumatic control cavity 3 is disposed on the lower surface of the pneumatic relay 2, an electrical cavity 7 is disposed at the lower position of the inner cavity of the housing 1, and an explosion-proof mechanism is disposed between the pneumatic control cavity 3 and the electrical cavity 7. The explosion-proof mechanism includes an explosion-proof air gap ring 9 and an explosion-proof air gap column 10, which are respectively disposed at both ends of the inner cavity of the explosion-proof mechanism. By adopting the structure of the explosion-proof air gap ring 9 combined with the explosion-proof air gap column 10, the explosion-proof requirements are met while ensuring that there is no pressure loss during the transmission of control air from the electrical conversion component to the pneumatic relay 2.

[0025] like Figs. 1-3As shown, an exhaust plug 11 is fixedly installed on the lower surface of the explosion-proof mechanism, and an exhaust spring 12 is fixedly installed on the lower surface of the exhaust plug 11. When the exhaust pressure of the pneumatic control chamber 3 reaches a certain value, the exhaust spring 12 is compressed, and the soft exhaust plug 11 exhausts the gas. This structure ensures that the pneumatic control chamber 3 is always in a slightly positive pressure state, thereby preventing the entry of external water, vapor and other contaminants, and greatly ensuring the reliable operation of the positioner on site.

[0026] like Figs. 1-3 As shown, a junction box component 8 is fixedly installed on the outer wall of the housing 1, and a proportional piezoelectric electrical conversion component 5 is fixedly installed on one side of the upper part of the inner cavity of the housing 1. This replaces the traditional electrical conversion principle based on coil components and nozzle baffles, and is also different from another electrical conversion principle that uses a switch-type piezoelectric ceramic valve to control the air circuit in a pulse manner. The proportional piezoelectric electrical conversion principle has fewer parts and extremely low power consumption, as low as 0.014MW.

[0027] A position feedback component 4 is fixedly installed on the other side of the upper part of the inner cavity of the housing 1. One end of the proportional piezoelectric electrical conversion component 5 is electrically connected to the electronic control board assembly 6. The output end of the position feedback component 4 is electrically connected to the electronic control unit. The input end of the electronic control unit is electrically connected to the proportional piezoelectric electrical conversion component 5. The position feedback component 4 includes a position reversal gear 13, a potentiometer gear 14, and a backlash elimination spring 15. The position reversal gear 13 is meshed with the potentiometer gear 14. The backlash elimination spring 15 is fixedly installed on the surface of the position feedback component 4 below the potentiometer gear 14. The proportional piezoelectric electrical conversion component 5 adopts the principle of pulse control of the electrical conversion of the air circuit. The position reversal gear 13 and the potentiometer gear 14 make it easier to realize the position feedback of the positioner and reduce the installation conditions of the positioner. The backlash elimination spring 15 ensures reliable transmission of the gears and eliminates the transmission gap between the gears.

[0028] Working principle: in use, the position feedback component 4 can convert the stroke displacement amount of the external pneumatic actuator into a feedback electrical signal output to the electronic control unit, and the electronic control unit compares the input electrical signal with the feedback signal through the single-chip microcomputer, calculates the deviation of the signal and the stroke, and then outputs a driving signal to drive the proportional piezoelectric electrical conversion component 5 to adjust the driving pressure between the air source and the pneumatic actuator according to the control mode, so as to realize the control of the valve at the correct valve position. The proportional piezoelectric electrical conversion component 5 is adopted to replace the traditional coil component and nozzle baffle electrical conversion principle, and it is also different from another kind of open-close type piezoelectric ceramic valve - pulse mode control air path electrical conversion principle. The proportional piezoelectric electrical conversion principle is adopted, the parts are few, the power consumption is extremely low, and the minimum can reach 0.014MW. Between the electrical cavity 7 and the air control cavity 3, the explosion-proof air gap ring 9 and the explosion-proof air gap column 10 are combined, which meets the requirement of explosion-proof, ensures that the control air of the electrical conversion component is transmitted to the pneumatic relay 2 without pressure loss, and when the discharge pressure of the air control cavity 3 reaches a certain value, the exhaust spring 12 is compressed, and the soft exhaust plug 11 realizes exhaust. This structure ensures that the air control cavity 3 is always in a slightly positive pressure state, thereby preventing the entry of water, steam and other pollutants from the outside, greatly ensuring the reliable work of the positioner in the field. The position feedback gear 13 and the potentiometer gear 14 are composed, which realizes the position feedback of the positioner more simply, reduces the installation conditions of the positioner, and eliminates the transmission gap between the gears. The utility model has the advantages of high intelligence, simple electrical conversion principle structure, low power consumption, good explosion-proof performance, and improved reliability of field work.

[0029] The above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms. Any skilled person in the art can change or modify the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model still belongs to the protection scope of the utility model technical scheme.

Claims

1. A new smart valve positioner comprising a housing (1), characterized in that: The upper position of the shell (1) is fixedly provided with a pneumatic relay (2), the lower surface of the pneumatic relay (2) is provided with a gas control cavity (3), the lower position of the inner cavity of the shell (1) is provided with an electrical cavity (7), an explosion-proof mechanism is arranged between the gas control cavity (3) and the electrical cavity (7), the explosion-proof mechanism comprises an explosion-proof air gap ring (9) and an explosion-proof air gap column (10), and the explosion-proof air gap ring (9) and the explosion-proof air gap column (10) are respectively arranged at two ends of the inner cavity of the explosion-proof mechanism.

2. A new smart valve positioner as claimed in claim 1, wherein: The lower surface of the explosion-proof mechanism is fixedly provided with an exhaust plug (11), and the lower surface of the exhaust plug (11) is fixedly provided with an exhaust spring (12).

3. A new smart valve positioner as claimed in claim 1, wherein: The outer side wall of the shell (1) is fixedly provided with a junction box component (8).

4. A new smart valve positioner as claimed in claim 1, wherein: One side of the upper position of the inner cavity of the shell (1) is fixedly provided with a proportional piezoelectric electrical conversion component (5), and the other side of the upper position of the inner cavity of the shell (1) is fixedly provided with a position feedback component (4).

5. A new smart valve positioner as claimed in claim 4, wherein: One end of the proportional piezoelectric electrical conversion component (5) is electrically connected with an electric control board assembly (6), the output end of the position feedback component (4) is electrically connected with an electric control unit, and the input end of the electric control unit is electrically connected with the proportional piezoelectric electrical conversion component (5).

6. A new smart valve positioner as claimed in claim 4, wherein: The position feedback component (4) comprises a position feedback gear (13), a potentiometer gear (14) and an anti-backlash spring (15), the position feedback gear (13) is connected in mesh with the potentiometer gear (14), and the surface of the position feedback component (4) is fixedly provided with the anti-backlash spring (15) below the position of the potentiometer gear (14).

7. A new smart valve positioner as claimed in claim 4, wherein: The proportional piezoelectric electrical conversion component (5) adopts a proportional control principle of electrical conversion of a gas circuit.

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