Pneumatic control valve positioner

Abstract

The utility model discloses a pneumatic control valve positioner which comprises a positioner main machine and a connecting mechanism, the positioner main machine is connected with a pneumatic control valve through the connecting mechanism, and the connecting mechanism comprises a proportional arm, a sliding block component, a sliding groove component, a sliding shaft and a locking piece. The proportional arm is connected to the positioner main machine, the sliding block component is connected to a valve rod of the pneumatic control valve, the sliding groove component is connected to the sliding block component, and a mounting strip hole for mounting a sliding shaft is formed in the proportional arm; a sliding groove strip hole is formed in the sliding groove component, one end of the sliding shaft is installed on the installation strip hole through a locking piece, the other end of the sliding shaft is inserted into the sliding groove strip hole, and the sliding shaft is connected with the sliding groove component in a sliding mode. The positioner main machine is connected with the pneumatic control valve through the connecting mechanism, adjustment and installation can be facilitated, the working and installation efficiency is improved, meanwhile, the pneumatic control valve positioner is additionally arranged on the pneumatic control valve, the response speed of the pneumatic control valve can be well increased, and positioning of the pneumatic control valve is faster and more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic regulating valve positioner. Background Art

[0002] The pneumatic control valve positioner is one of the important accessories and fittings of the pneumatic control valve, which plays the role of valve positioning. The pneumatic control valve positioner and the pneumatic actuator together constitute the automatic control unit and are connected with various control valves. After debugging and installation, they are combined into a pneumatic control valve.

[0003] A connection feedback mechanism is required between the positioner body and the pneumatic control valve. There are many types of conventional connection feedback mechanisms. However, due to various factors such as matching, the failure rate is often high and the maintenance is relatively cumbersome. When the pneumatic actuator is not operating normally or fails and a different type of positioner needs to be replaced, whether the feedback connection rod matches the positioner becomes an important reason affecting work efficiency. At present, there is a lack of a connection feedback mechanism that is easy to install and easy to adjust. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pneumatic regulating valve positioner to solve the problem that the current pneumatic regulating valve positioner lacks a connection feedback mechanism that is easy to install and adjust.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a pneumatic regulating valve positioner, which includes a positioner host and a connecting mechanism, and the positioner host is connected to the pneumatic regulating valve through the connecting mechanism;

[0006] The connecting mechanism includes a proportional arm, a slider component, a slide slot component, a sliding shaft and a locking member;

[0007] The proportional arm is connected to the positioner host, the slider component is connected to the valve stem of the pneumatic regulating valve, the slide slot component is connected to the slider component, and a mounting hole for mounting the sliding shaft is provided on the proportional arm;

[0008] The slide slot component is provided with a slide slot bar hole, one end of the sliding shaft is mounted on the mounting bar hole through the locking member, the other end of the sliding shaft is inserted into the slide slot bar hole, and the sliding shaft is slidably connected to the slide slot component.

[0009] In some embodiments, the proportional arm is rotatably connected to the positioner host, the slider component is connected to the valve stem of the pneumatic regulating valve via a first fastener, and the slide slot component is connected to the slider component via a second fastener.

[0010] In some embodiments, the connection mechanism further includes a first mounting plate and a second mounting plate;

[0011] The first mounting plate is connected to the positioner host through a third fastener, the second mounting plate is connected to the body of the pneumatic regulating valve through a fourth fastener, and the first mounting plate is connected to the second mounting plate through a fifth fastener.

[0012] In some embodiments, an elastic member is installed on the slide slot component, and a portion of the elastic member is located in the slide slot bar hole;

[0013] When the sliding shaft is located in the sliding slot hole, the sliding shaft is located below the elastic member.

[0014] In some embodiments, the scale arm is provided with a scale.

[0015] In some embodiments, the locator host includes a locator base, the first mounting plate is connected to the locator base, and the locator base is provided with a first connection port, a second connection port and a third connection port.

[0016] In some embodiments, the locator host includes a sensor, a control module, a display end cover and a display screen arranged on the first connection port;

[0017] The sensor and the display screen are both electrically connected to the control module.

[0018] In some embodiments, the positioner host further includes an I / P unit module, an air path module, and a mounting end cover disposed on the second connection port;

[0019] The I / P unit module is electrically connected to the gas circuit module.

[0020] In some embodiments, the locator host further includes a wiring module and a wiring terminal cover disposed on the third connection port;

[0021] The wiring module is electrically connected to the control module.

[0022] In some embodiments, the locator host further includes a magnetic button assembly disposed on the locator base.

[0023] The implementation of the utility model has the following beneficial effects: the positioner host is connected to the pneumatic control valve through a connecting mechanism, and the connecting mechanism is an adjustable feedback lever mechanism, which can be easily adjusted and installed, thereby improving the work installation efficiency. At the same time, the pneumatic control valve is equipped with a pneumatic control valve positioner, which can greatly improve the response speed of the pneumatic control valve and make its positioning faster and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the pneumatic regulating valve positioner in some embodiments of the utility model;

[0026] Figure 2 It is a schematic diagram of the exploded parts of the positioner host in some embodiments of the utility model;

[0027] Figure 3 It is a structural front view of a proportional arm in some embodiments of the utility model;

[0028] Figure 4 is a top view of the structure of the proportional arm in some embodiments of the utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the chute component in some embodiments of the utility model;

[0030] Figure 6 It is a control principle diagram of a feedback control loop of a pneumatic regulating valve positioner in some embodiments of the utility model. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0032] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] See also Figures 1 to 5 The utility model discloses a pneumatic regulating valve positioner, which may include a positioner host 1 and a connecting mechanism 2, wherein the positioner host 1 is connected to a pneumatic regulating valve 3 through the connecting mechanism 2. Specifically, the connecting mechanism 2 includes a proportional arm 21, a slider component 22, a slide groove component 23, a sliding shaft 24, and a locking member 25. The proportional arm 21 is connected to the positioner host 1, the slider component 22 is connected to the valve stem of the pneumatic regulating valve 3, the slide groove component 23 is connected to the slider component 22, a mounting bar hole 211 for mounting the sliding shaft 24 is provided on the proportional arm 21, a slide groove bar hole 231 is provided on the slide groove component 23, one end of the sliding shaft 24 is mounted on the mounting bar hole 211 through the locking member 25, the other end of the sliding shaft 24 is inserted into the slide groove bar hole 231, and the sliding shaft 24 is slidably connected to the slide groove component 23.

[0034] More specifically, the proportional arm 21 can be rotatably connected to the positioner host 1. When the proportional arm 21 rotates, the angular stroke of the proportional arm 21 can be measured by the sensor 12 described below, so that the positioner host 1 can obtain the valve position information of the pneumatic control valve 3. Among them, the setting direction of the mounting bar hole 211 is the length direction of the proportional arm 21, and the sliding shaft 24 can adjust the position in the length direction of the proportional arm 21 according to the actual application scenario. At the same time, the proportional arm 21 is provided with a scale 212 to facilitate the adjustment of the on-site staff. In addition, the slider component 22 is roughly L-shaped, which is connected to the valve stem of the pneumatic control valve 3, and the slide groove component 23 is connected to the slider component 22. After the sliding shaft 24 is fixedly connected to the proportional arm 21, it is also located in the slide groove bar hole 231 of the slide groove component 23. When the valve stem of the pneumatic control valve 3 moves up and down, it can drive the proportional arm 21 to rotate. The proportional arm 21 , the slider component 22 , the slide slot component 23 , the sliding shaft 24 and the locking member 25 together form an adjustable feedback lever mechanism.

[0035] Furthermore, the slider component 22 is connected to the valve stem of the pneumatic regulating valve 3 through a first fastener 221, and the chute component 23 is connected to the slider component 22 through a second fastener 222, and the fastener may preferably be a hexagon socket head screw. The slider component 22 is provided with a first adjustment hole for installing the first fastener 221, and the chute component 23 is provided with a second adjustment hole for installing the second fastener 222. The second adjustment hole is arranged parallel to the chute bar hole 231 in this embodiment, and the above adjustment holes facilitate the installation of the slider component 22 and the chute component 23.

[0036] The connecting mechanism 2 also includes a first mounting plate 26 and a second mounting plate 27. The first mounting plate 26 is connected to the positioner host 1 through a third fastener, and the second mounting plate 27 is connected to the body of the pneumatic regulating valve 3 through a fourth fastener 271. The first mounting plate 26 is connected to the second mounting plate 27 through a fifth fastener 261. The setting of the first mounting plate 26 and the second mounting plate 27 realizes the positioning of the positioner host 1 relative to the pneumatic regulating valve 3.

[0037] like Figure 5 As shown, an elastic member 232 is installed on the slide slot component 23, and a part of the elastic member 232 is located in the slide slot hole 231. When the sliding shaft 24 is located in the slide slot hole 231, the sliding shaft 24 is located below the elastic member 232. The elastic member 232 is used to lightly press the sliding shaft 24 to prevent the sliding shaft 24 from shaking up and down and causing the valve position to fluctuate. The elastic member can be a spring or a spring.

[0038] The specific process of connecting the positioner host 1 with the pneumatic control valve 3 through the connecting mechanism 2 is as follows:

[0039] 1. Use the second fastener 222 to fix the slide member 23 on the slider member 22, then use the first fastener 221 to fix the slider member 22 on the valve stem of the pneumatic control valve 3, and use the fourth fastener 271 to fix the second mounting plate 27 on the body of the pneumatic control valve 3;

[0040] 2. According to the rated stroke of the pneumatic control valve 3, adjust the sliding shaft 24 to the corresponding scale 212 on the proportional arm 21 and fix it. In this embodiment, the stroke of the pneumatic control valve 3 is 50.8 mm. Adjust the sliding shaft 24 to the corresponding scale 50 mm, and then use the locking member 25 to fix the sliding shaft 24 on the proportional arm 21. Use the third fastener to fix the positioner host 1 on the first mounting plate 26, and then use the fifth fastener 261 to connect the first mounting plate 26 and the second mounting plate 27 together. At this time, the sliding shaft 24 is located below the elastic member 232 in the slide slot hole 231;

[0041] 3. Loosen the first fastener 221 that fixes the slider component 22, move the slider component 22, make the proportional arm 21 close to the limit column on the positioner host 1, and then tighten the first fastener 221 to complete the installation.

[0042] Furthermore, the locator host 1 includes a locator base 11, a first mounting plate 26 is connected to the locator base 11, and the locator base 11 is provided with a first connection port 111, a second connection port 112 and a third connection port 113. In the present embodiment, the second connection port 112 and the third connection port 113 are respectively located on the left and right sides of the locator base 11, and the first connection port 111 is located in the middle position of the locator base 11.

[0043] In addition, the positioner host 1 includes a sensor 12, a control module 13, a display end cover 14 and a display screen 141 arranged on the first connection port 111. The sensor 12 and the display screen 141 are both electrically connected to the control module 13. The sensor 12 can be a position sensor. When the proportional arm 21 rotates, the angular stroke of the proportional arm 21 can be measured by the sensor 12, so that the control module 13 of the positioner host 1 can obtain the valve position information of the pneumatic control valve 3. The control module 13 may include a central processing unit and an A / D converter. The A / D converter stands for analog-to-digital converter, which refers to an electronic component that converts analog signals into digital signals. The control module 13 can be used for data acquisition, calculation, and control signal output. The display screen 141 on the display end cover 14 can display relevant information, such as the valve opening size.

[0044] The positioner host 1 also includes an I / P unit module 15, an air circuit module 16 and an installation end cover 17 arranged on the second connection port 112. The I / P unit module 15 is electrically connected to the air circuit module 16. The air circuit module 16 may include a pneumatic amplifier. The I / P unit module 15 can convert an electrical signal into a gas signal to drive the pneumatic amplifier of the air circuit module 16 to operate. The pneumatic amplifier can be used to amplify the gas power. It can output a gas pressure signal to directly drive the pneumatic actuator to generate a corresponding displacement, so that the valve position of the pneumatic control valve 3 is maintained at a certain set opening. The pneumatic actuator is used to drive the valve stem of the pneumatic control valve 3 to move.

[0045] The positioner host 1 also includes a wiring module 18 and a wiring terminal cover 19 disposed on the third connection port 113, and the wiring module 18 is electrically connected to the control module 13. The wiring module 18 may include a wiring terminal, which can receive a 4-20mA control signal from the control system, such as the electrical connection between the positioner host 1 and the pneumatic actuator can be performed through the wiring module 18, and the wiring module 18 also inputs a valve position signal if it has a feedback function.

[0046] The locator host 1 also includes a magnetic button assembly 20 disposed on the locator base 11 , and the magnetic button assembly 20 can be used in conjunction with the display screen 141 to perform menu selection and parameter modification.

[0047] In general, the positioner base 11 has three separate connection ports, which can make the control module 13, the wiring module 18, and the air circuit module 16 completely isolated and suitable for dust explosion-proof places. The positioner host 1 adopts two-wire transmission, which means that the power supply, 4-20mA analog signal, and two-way digital communication signal are transmitted on two wires. The components in the positioner host 1 and the pneumatic actuator form a feedback control loop. The control principle of the feedback control loop is as follows: Figure 6 As shown. In this feedback control loop, the displayed pneumatic control valve 3 position feedback signal is used as the controlled variable, and is compared with the given signal value in the central processor. The deviation of the two signals is transmitted through the output port of the main control board of the central processor, and pulses of different widths are sent to control the pressure output of the pressure output port of the I / P unit module 15, thereby driving the pneumatic actuator to generate displacement and also causing the pneumatic control valve 3 to operate.

[0048] More specifically, the control module 13 receives a 4-20mA control signal (corresponding to a 0-100% valve position control input) and simultaneously collects the current actual valve position. If there is an error between the two data, the control module 13 outputs a PWM wave to drive the I / P unit module 15 to operate, so that the external mechanism outputs the air source to the pneumatic actuator, thereby operating the pneumatic control valve 3. This cycle repeats until the control signal and the valve position signal become equal, and the control module 13 stops outputting the PWM wave. PWM is pulse width modulation, that is, a pulse waveform with a variable duty cycle. Pulse width modulation is a method of digitally encoding analog signal levels. It is an existing mature technology and will not be described in detail here.

[0049] The positioner host 1 can be directly connected to the HART protocol network system. The user can read and write its basic equipment management information such as the workstation number, equipment number, product serial number, etc. through the positioner host computer, and can monitor the dynamic information of the pneumatic control valve 3 in real time, such as whether the pneumatic control valve 3 is fully open or fully closed. Only the relevant parameters of the positioner host 1 need to be reset and adjusted to meet the requirements. The HART protocol is an open communication protocol for addressable remote sensor high-speed channels. It is a communication protocol used between field intelligent instruments and control room equipment. It is an existing mature technology and will not be described here.

[0050] It can be understood that the positioner host 1 is connected to the pneumatic control valve 3 through the connecting mechanism 2. The connecting mechanism 2 is an adjustable feedback lever mechanism, which can be easily adjusted and installed, thereby improving the work installation efficiency. At the same time, the pneumatic control valve 3 is equipped with a pneumatic control valve positioner, which can greatly improve the response speed of the pneumatic control valve 3, and can overcome the friction and unbalanced force on the valve core, making its positioning faster and more accurate, which is particularly suitable for fields with frequent vibrations.

[0051] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A pneumatic control valve positioner, characterized in that: It comprises a positioner host (1) and a connecting mechanism (2), wherein the positioner host (1) is connected to a pneumatic regulating valve (3) via the connecting mechanism (2); The connecting mechanism (2) comprises a proportional arm (21), a sliding block component (22), a sliding groove component (23), a sliding shaft (24) and a locking member (25); The proportional arm (21) is connected to the positioner host (1), the slider component (22) is connected to the valve stem of the pneumatic regulating valve (3), the slide groove component (23) is connected to the slider component (22), and the proportional arm (21) is provided with a mounting hole (211) for mounting the sliding shaft (24); The slide groove component (23) is provided with a slide groove bar hole (231), one end of the sliding shaft (24) is mounted on the mounting bar hole (211) through the locking member (25), the other end of the sliding shaft (24) is inserted into the slide groove bar hole (231), and the sliding shaft (24) is slidably connected to the slide groove component (23).

2. The pneumatic regulating valve positioner according to claim 1, characterized in that: The proportional arm (21) is rotatably connected to the positioner host (1), the slider component (22) is connected to the valve stem of the pneumatic control valve (3) via a first fastener (221), and the slide groove component (23) is connected to the slider component (22) via a second fastener (222).

3. The pneumatic regulating valve positioner according to claim 1, characterized in that: The connecting mechanism (2) further comprises a first mounting plate (26) and a second mounting plate (27); The first mounting plate (26) is connected to the positioner main unit (1) via a third fastener, the second mounting plate (27) is connected to the body of the pneumatic control valve (3) via a fourth fastener (271), and the first mounting plate (26) is connected to the second mounting plate (27) via a fifth fastener (261).

4. The pneumatic regulating valve positioner according to claim 1, characterized in that: An elastic member (232) is installed on the slide groove component (23), and a portion of the elastic member (232) is located in the slide groove bar hole (231); When the sliding shaft (24) is located in the sliding groove bar hole (231), the sliding shaft (24) is located below the elastic member (232).

5. The pneumatic regulating valve positioner according to claim 1, characterized in that: The proportional arm (21) is provided with a scale (212).

6. The pneumatic regulating valve positioner according to claim 3, characterized in that: The positioner host (1) comprises a positioner base (11), the first mounting plate (26) is connected to the positioner base (11), and the positioner base (11) is provided with a first connection port (111), a second connection port (112) and a third connection port (113).

7. The pneumatic regulating valve positioner according to claim 6, characterized in that: The locator host (1) comprises a sensor (12) arranged on a first connection port (111), a control module (13), a display end cover (14) and a display screen (141); The sensor (12) and the display screen (141) are both electrically connected to the control module (13).

8. The pneumatic regulating valve positioner according to claim 7, characterized in that: The positioner host (1) also includes an I / P unit module (15), an air path module (16), and a mounting end cover (17) arranged on the second connection port (112); The I / P unit module (15) is electrically connected to the gas circuit module (16).

9. The pneumatic regulating valve positioner according to claim 7, characterized in that: The positioner host (1) also includes a wiring module (18) and a wiring terminal cover (19) arranged on the third connection port (113); The wiring module (18) is electrically connected to the control module (13).

10. The pneumatic regulating valve positioner according to claim 6, characterized in that: The positioner host (1) also includes a magnetic button assembly (20) arranged on the positioner base (11).

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