CN108612897B - Positioner for electric valve - Google Patents
Positioner for electric valve Download PDFInfo
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- CN108612897B CN108612897B CN201810771908.0A CN201810771908A CN108612897B CN 108612897 B CN108612897 B CN 108612897B CN 201810771908 A CN201810771908 A CN 201810771908A CN 108612897 B CN108612897 B CN 108612897B
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- piezoelectric valve
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- 230000008713 feedback mechanism Effects 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000006073 displacement reaction Methods 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses an electric valve positioner which comprises a closed shell, a feedback mechanism, a piezoelectric valve and a control unit, wherein a gas channel is formed in the closed shell, one end of the gas channel is positioned in the closed shell, and the other end of the gas channel is positioned outside the closed shell; the feedback mechanism comprises a feedback shaft, a potentiometer, a driving gear and a driven gear, wherein the feedback shaft can be pivoted on the closed shell and extends along the up-down direction; the potentiometer is arranged in the shell, the driving gear is arranged at the upper end of the feedback shaft, and the driven gear is arranged on the rotating shaft of the potentiometer and meshed with the driving gear; the piezoelectric valve is arranged in the closed shell, and an air port of the piezoelectric valve is communicated with one end of the air channel; the control unit is arranged in the closed shell and is electrically connected with the potentiometer and the piezoelectric valve, and is used for controlling the piezoelectric valve according to signals of the potentiometer. The electro-pneumatic valve positioner can realize accurate feedback adjustment control.
Description
Technical Field
The invention relates to the technical field of electric valves, in particular to an electric valve positioner.
Background
The electric valve positioner is a main accessory of the pneumatic control valve, and is usually matched with the pneumatic control valve, the electric valve positioner is connected with an actuator (generally, an air cylinder and the like), the actuator is connected with the pneumatic control valve, the actuator pushes a valve rod in the pneumatic control valve to move so as to change the opening degree, the electric valve positioner is linked with the actuator, the valve rod displacement of the pneumatic control valve is converted into an electric signal, the electric signal is fed back to the controller, the electric signal is compared with a set signal by the controller, and when the electric signal and the set signal deviate, the controller changes an output signal to the actuator, so that the actuator acts, and the opening degree of the pneumatic control valve is regulated to a set value. In other words, the valve positioner uses the valve rod displacement as a feedback control signal, thereby realizing the feedback control of the pneumatic regulating valve.
In the related art, an electric valve positioner converts a displacement signal of a valve rod into an electric signal through a feedback mechanism, wherein the electric signal reflects the opening degree of a pneumatic regulating valve, that is, the electric signal and the opening degree of the pneumatic regulating valve are in a corresponding relation. However, the feedback mechanism is inaccurate in measuring the displacement signal, that is, the output electric signal inaccurately reflects the current opening of the pneumatic control valve, so that the control accuracy of the pneumatic control valve is low, and in addition, the feedback mechanism is complex in structure, difficult to assemble and maintain and high in cost.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, the invention aims to propose an electric valve positioner.
To achieve the above object, an electro-pneumatic valve positioner according to an embodiment of the present invention includes:
The device comprises a closed shell, wherein a gas channel is formed in the closed shell, one end of the gas channel is positioned in the closed shell, and the other end of the gas channel is positioned outside the closed shell;
The feedback mechanism comprises a feedback shaft, a potentiometer, a driving gear and a driven gear, wherein the feedback shaft can be pivoted on the closed shell and extends along the up-down direction, the upper end of the feedback shaft is positioned in the closed shell, and the lower end of the feedback shaft extends out of the closed shell to form a connecting end; the potentiometer is arranged in the shell, the driving gear is arranged at the upper end of the feedback shaft, and the driven gear is arranged on the rotating shaft of the potentiometer and meshed with the driving gear;
the piezoelectric valve is arranged in the closed shell, and an air port of the piezoelectric valve is communicated with one end of the air channel;
The control unit is arranged in the closed shell and is electrically connected with the potentiometer and the piezoelectric valve, and is used for controlling the piezoelectric valve according to signals of the potentiometer.
According to the electric valve positioner provided by the embodiment of the invention, the connecting end of the feedback shaft can be connected to the actuator, the actuator can drive the feedback shaft to rotate when in action, the feedback shaft drives the driving gear to rotate, the driving gear drives the driven gear to rotate, the driven gear further drives the rotating shaft of the potentiometer to rotate, the potentiometer can generate an electric signal, and the controller can further control the actuator to perform feedback adjustment according to the electric signal and the setting signal. Therefore, the displacement of the actuator can be converted into an accurate electric signal through the feedback mechanism formed by the feedback shaft, the driving gear, the driven gear and the potentiometer, the feedback result is more reliable, and the controller can accurately control the actuator according to the electric signal, so that accurate feedback adjustment control is achieved.
In addition, the electric valve positioner according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the enclosure comprises:
The piezoelectric valve is arranged in the first area and is positioned above the gas channel;
The surface shell is arranged on the bottom shell and locked and fixed with the bottom shell through a fastener, and a sealing ring is arranged between the surface shell and the bottom shell.
According to one embodiment of the invention, the piezoelectric valve and the feedback mechanism are arranged on the bottom shell, and the control unit is arranged on the overhead seat.
According to one embodiment of the invention, the overhead seat comprises a bracket, a bottom box and a surface cover, wherein the lower end of the bracket is fixed on the bottom shell, the bottom box is installed at the upper end of the bracket, one side of the bottom box is provided with a wiring terminal group used for being connected with the piezoelectric valve and the potentiometer, the control unit is installed in the bottom box, and the surface cover is arranged on the bottom box so as to seal the control unit in the bottom box.
According to one embodiment of the present invention, the gas channel includes a gas inlet channel, a gas outlet channel, and a gas outlet channel, wherein an inlet of the gas inlet channel, an outlet of the gas outlet channel, and an outlet of the gas outlet channel are located on a side surface of the bottom case, and an outlet of the gas inlet channel, an inlet of the gas outlet channel, and an inlet of the gas outlet channel are located on a top surface of the bottom case;
the bottom surface of the piezoelectric valve is provided with an air inlet, an air outlet and an air outlet, the outlet of the air inlet channel is connected with the air inlet of the piezoelectric valve, the inlet of the air outlet channel is connected with the air outlet of the piezoelectric valve, and the inlet of the air outlet channel is connected with the air outlet of the piezoelectric valve.
According to one embodiment of the invention, a movable member is provided within the closed housing, the movable member being configured to be movable between a first position and a second position, the potentiometer being provided on the movable member;
The driven gear is engaged with the driving gear when the movable member is located at the first position, and the driven gear is separated from the driving gear when the movable member moves from the first position to the second position.
According to one embodiment of the invention, the movable member comprises:
a pivot member extending in an up-down direction and provided on the bottom case pivotably about its own axis between the first position and the second position;
a link arm, one end of which is connected with the pivoting member to rotate with the pivoting member, and the other end of which extends in a horizontal direction;
The potentiometer is arranged at the other end of the linkage arm.
According to one embodiment of the present invention, further comprising:
the elastic reset piece is arranged between the movable piece and the bottom shell and is used for normally driving the movable piece to move from the second position to the first position.
According to one embodiment of the invention, the pivot comprises:
The lower end of the positioning rod is fixed on the bottom shell;
the pivot sleeve is sleeved at the upper end of the positioning rod and can pivot between the first position and the second position around the axis of the pivot sleeve;
And one end of the linkage arm is fixedly connected with the pivoting sleeve in the circumferential direction.
According to one embodiment of the invention, the elastic reset piece is a torsion spring, the torsion spring is sleeved outside the pivot sleeve, one end of the torsion spring is fixed with the linkage arm, and the other end of the torsion spring is fixed with the bottom shell.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an embodiment of an electro-pneumatic valve positioner;
FIG. 2 is an exploded view of an embodiment of the present invention electro-valve positioner;
FIG. 3 is a partially exploded schematic illustration of an embodiment of an electro-pneumatic valve positioner of the present invention;
FIG. 4 is a schematic view of a portion of an electro-pneumatic valve positioner according to an embodiment of the present invention;
FIG. 5 is a top view of a portion of the structure of an embodiment of an electro-valve positioner of the present invention;
FIG. 6 is an exploded view of an overhead seat in an electro-pneumatic valve positioner according to an embodiment of the present invention;
FIG. 7 is a schematic view of a bottom surface of a piezoelectric valve having two air outlets in an embodiment of the present invention;
FIG. 8 is a schematic view of the underside of a piezoelectric valve having an air outlet in an embodiment of the present invention;
Fig. 9 is a schematic view of another embodiment of an electro-pneumatic valve positioner according to an embodiment of the present invention.
Reference numerals:
A closed casing 10;
A bottom case 101;
A boss 1011;
A face-piece 102;
an intake passage T10;
an air outlet channel T11;
a feedback mechanism 20;
a feedback shaft 201;
a drive gear 202;
a driven gear 203;
A potentiometer 204;
an elastic restoring member 21;
A piezoelectric valve 30;
A housing seat 40;
A holder 401;
A bottom box 402;
a face cover 403;
A terminal block 404;
a display screen 41;
A movable member 50;
A pivot 501;
a positioning lever 5011;
pivot sleeve 5012;
A linkage arm 502;
a stopper 5021;
a control unit 60;
a pressure gauge device 70;
a conversion base 701;
A first pressure gauge 702;
a second pressure gauge 703.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present invention and should not be construed as limiting the invention, and all other embodiments, based on the embodiments of the present invention, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
An electro-pneumatic valve positioner according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 9, an electro-pneumatic valve positioner according to an embodiment of the present invention includes a closed casing 10, a feedback mechanism 20, a piezoelectric valve 30, and a control unit 60 (not shown).
Specifically, a gas channel is formed in the closed casing 10, one end of the gas channel is located in the closed casing 10, and the other end of the gas channel is located outside the closed casing 10. The closed casing 10 forms a closed structure, and can protect the feedback mechanism 20, the piezoelectric valve 30 and the control unit 60, such as water resistance, impact resistance, etc., and preferably, the closed casing 10 can be made of a metal material with high corrosion resistance and high strength.
The feedback mechanism 20 comprises a feedback shaft 201, a potentiometer 204, a driving gear 202 and a driven gear 203, wherein the feedback shaft 201 can be pivotally arranged on the closed shell 10 and extends along the up-down direction, the upper end of the feedback shaft 201 is positioned in the closed shell 10, and the lower end of the feedback shaft 201 extends out from the closed shell 10 to form a connecting end; the potentiometer 204 is disposed in the housing, the driving gear 202 is disposed at the upper end of the feedback shaft 201, and the driven gear 203 is disposed on the rotating shaft of the potentiometer 204 and is meshed with the driving gear 202.
In a specific application, the lower end of the feedback shaft 201 may be connected to an actuator, the actuator is connected to a pneumatic control valve, when the actuator acts, the valve rod of the pneumatic control valve may be driven to act, so as to adjust the opening of the pneumatic control valve, meanwhile, when the actuator acts, the feedback shaft 201 may be driven to rotate, the feedback shaft 201 drives the driving gear 202 to rotate, the driving gear 202 further drives the driven gear 203 to rotate, and finally, the driven gear 203 drives the rotating shaft of the potentiometer 204 to rotate, so that the potentiometer 204 may generate an electrical signal, that is, displacement of the actuator is converted into an electrical signal.
A piezoelectric valve 30 is disposed in the closed casing 10, and an air port of the piezoelectric valve 30 communicates with the one end of the air passage. The control unit 60 is disposed in the closed casing 10 and electrically connected to the potentiometer 204 and the piezoelectric valve 30, and is configured to control the piezoelectric valve 30 according to the signal of the potentiometer 204. The piezoelectric valve 30 is an electrical conversion device, such as a piezoelectric valve of hoerbiger. The control unit 60 receives an external setting signal (for example, a 4-20 mA current signal) and an electric signal fed back by the potentiometer 204, compares the electric signal with the setting signal, and outputs a control signal to control the piezoelectric valve 30 to be opened or closed, when the piezoelectric valve 30 is opened, high-pressure gas can be provided for the actuator to push the actuator to act, and the actuator further pushes the valve rod of the pneumatic control valve to further adjust the opening of the pneumatic control valve, so that the feedback control of the pneumatic control valve is realized.
According to the electric valve positioner provided by the embodiment of the invention, the connecting end of the feedback shaft 201 can be connected to the actuator, the actuator can drive the feedback shaft 201 to rotate when in action, the feedback shaft 201 drives the driving gear 202 to rotate, the driving gear 202 drives the driven gear 203 to rotate, the driven gear 203 further drives the rotating shaft of the potentiometer 204 to rotate, the potentiometer 204 can generate an electric signal, and the controller can compare the electric signal with the set signal to further control the actuator to perform feedback adjustment. In this way, the feedback mechanism 20 formed by the feedback shaft 201, the driving gear 202, the driven gear 203 and the potentiometer 204 can convert the displacement of the actuator into an accurate electric signal, the feedback result is more reliable, and the controller can accurately control the actuator according to the electric signal, so as to achieve accurate feedback adjustment control.
It should be noted that, the potentiometer 204 is used for converting displacement into an electrical signal, and the potentiometer 204 may be a conductive plastic potentiometer 204, which may convert a displacement signal into a voltage signal, where the displacement signal is in a proportional relationship with the voltage signal.
Referring to fig. 2, in one embodiment of the present invention, the enclosure 10 includes a bottom case 101 and a face case 102, wherein the bottom case 101 has a first area and a second area therein, the gas channel is formed in the first area, the one end of the gas channel is located on the top surface of the bottom case 101, the other end of the gas channel is located on the side surface of the bottom case 101, the feedback mechanism 20 is disposed in the second area, and the piezoelectric valve 30 is mounted in the first area and located above the gas channel. The surface shell 102 is covered on the bottom shell 101 and locked and fixed with the bottom shell 101 through a fastener, and a sealing ring is arranged between the surface shell 102 and the bottom shell 101.
That is, the inside of the bottom case 101 is divided into two regions, i.e., a first region in which the gas passage is formed and a second region in which the piezoelectric valve 30 is provided above the gas passage and the feedback mechanism 20 is provided. After the face cover 403 and the bottom case 101 are covered, a sealing structure is formed, and the piezoelectric valve 30 and the feedback mechanism 20 can be sealed in the closed casing 10.
Since the one end of the gas passage is located at the top surface of the bottom case 101, when the piezoelectric valve 30 is installed in the first region, the gas port of the bottom surface thereof is conveniently communicated with the one end of the gas passage. And the other end of the gas passage is located at the side of the bottom case 101, it is convenient to connect with the actuator. Furthermore, by the partition arrangement in the bottom case 101, the piezoelectric valve 30 and the feedback mechanism 20 can be separated from each other, and the structure thereof is simple and compact, and the assembly and maintenance are convenient.
Referring to fig. 2, in some embodiments of the present invention, a stand 40 is further included, the stand 40 is disposed in the bottom case 101 and above the piezoelectric valve 30 and the feedback mechanism 20, and the control unit 60 is disposed on the stand 40. In this way, the piezoelectric valve 30, the feedback mechanism 20, and the overhead seat 40 can be formed as independent modules, and are disposed in the lateral and longitudinal directions within the closed casing 10, which is simpler and more compact in structure and more convenient to assemble and maintain.
Referring to fig. 2 and 6, specifically, the overhead seat 40 includes a support 401, a bottom case 402 and a surface cover 403, the lower end of the support 401 is fixed to the bottom case 101, the bottom case 402 is mounted on the upper end of the support 401, a connection terminal set 404 for connecting the piezoelectric valve 30 and the potentiometer 204 is disposed on one side of the bottom case 402, the control unit 60 is mounted in the bottom case 402, and the surface cover 403 is covered on the bottom case 402 to seal the control unit 60 in the bottom case 402.
That is, the stand 401 supports the bottom case 402 above the bottom case 101, so that a certain space is formed between the bottom case 402 and the bottom case 101, so that the piezoelectric valve 30 and the feedback mechanism 20 are installed in the bottom case 101, and thus, the structure is compact, and the assembly is convenient. Meanwhile, an accommodating space is formed in the bottom box 402, the control unit 60 is accommodated in the accommodating space and then covered on the bottom box 402 through the face cover 403, so that the control unit 60 is sealed in the bottom box 402, and the control unit 60 can be completely isolated from the external environment, and a good protection effect is achieved on the control unit 60. In order to facilitate the electrical connection between the control unit 60 and the piezoelectric valve 30 and the potentiometer 204, a terminal block 404 is provided on the side of the bottom case 402, and when assembling, the leads of the piezoelectric valve 30 and the potentiometer 204 are plugged into the corresponding terminals on the terminal block 404, so that the electrical connection between the piezoelectric valve 30 and the potentiometer 204 and the control unit 60 can be realized, and the wiring is convenient.
Referring to fig. 3 to 4 and 7, in one embodiment of the present invention, the gas channel includes a gas inlet channel T10, a gas outlet channel T11 and a gas outlet channel, wherein an inlet T101 of the gas inlet channel T10, an outlet T112 of the gas outlet channel T11 and an outlet T122 of the gas outlet channel are located at the side surface of the bottom case 101, and an outlet T102 of the gas inlet channel T10, an inlet T111 of the gas outlet channel T11 and an inlet T121 of the gas outlet channel are located at the top surface of the bottom case 101. The bottom surface of the piezoelectric valve 30 is provided with an air inlet 301, an air outlet 302 and an air outlet 303, the outlet T102 of the air inlet channel T10 is connected with the air inlet 301 of the piezoelectric valve 30, the inlet T111 of the air outlet channel T11 is connected with the air outlet 302 of the piezoelectric valve 30, and the inlet T121 of the air outlet channel is connected with the air outlet 303 of the piezoelectric valve 30.
In assembly, the piezoelectric valve 30 is placed in the first area of the bottom case 402, and the air inlet 301, the air outlet 302 and the air outlet 303 on the bottom surface of the piezoelectric valve 30 are respectively opposite to the outlet T102 of the air inlet channel T10, the inlet T111 of the air outlet channel T11 and the inlet T121 of the air outlet channel, and then the piezoelectric valve 30 is fastened and fixed on the bottom case 101 by using fasteners (such as screws, etc.), so that the outlet T102 of the air inlet channel T10 can be communicated with the air inlet 301 of the piezoelectric valve 30, the inlet T111 of the air outlet channel T11 is communicated with the air outlet 302 of the piezoelectric valve 30, and the inlet T121 of the air outlet channel is communicated with the air outlet 303 of the piezoelectric valve 30, which is convenient for assembly. Meanwhile, after the assembly is completed, in a specific application, since the inlet T101 of the air inlet channel T10, the outlet T112 of the air outlet channel T11 and the outlet T122 of the air outlet channel are located on the side surface of the bottom shell 101, the connection between the inlet T101 of the air inlet channel T10 and the air source device and the connection between the outlet T112 of the air outlet channel T11 and the actuator are facilitated.
It should be noted that, when there are one or two air outlet channels T11, the present invention may be applied to a piezoelectric valve 30 (as shown in fig. 8) having one air outlet 302, and the air outlet 302 of the piezoelectric valve 30 is connected to an interface (e.g., a single-acting cylinder) of a single-interface actuator, so as to implement driving of the single-interface actuator. When there are two air outlet channels T11 (as shown in fig. 3 and 4), the method can be applied to the piezoelectric valve 30 (as shown in fig. 7) having two air outlets 302, and further, the two air outlets 302 of the piezoelectric valve 30 are respectively connected to two interfaces (such as double-acting cylinders) of the dual-interface actuator in a one-to-one correspondence manner, so as to realize the driving of the dual-interface actuator.
Referring to fig. 9, in one embodiment of the present invention, the pressure gauge device 70 further includes a conversion seat 701, and a first pressure gauge 702 and a second pressure gauge 703, wherein a first channel and a second channel are formed in the conversion seat 701, and an outlet of the first channel and an inlet of the second channel are disposed on a first side surface of the conversion seat 701 and correspond to an inlet T101 of the air inlet channel T10 and an outlet T112 of the air outlet channel T11, respectively; the inlet 7011 of the first channel and the outlet 7012 of the second channel are disposed on a second side of the conversion base 701, and the first side and the second side are opposite to each other.
The adapter 701 is mounted on the side surface of the bottom case 101, the outlet of the first channel is communicated with the inlet T101 of the air inlet channel T10, and the inlet of the second channel is communicated with the outlet T112 of the air outlet channel T11. The first pressure gauge 702 and the second pressure gauge 703 are disposed on the top surface of the conversion seat 701, the first pressure gauge 702 is communicated with the first channel and is used for detecting the air pressure in the first channel, and the second pressure gauge 703 is communicated with the second channel and is used for detecting the pressure in the second channel.
That is, one ends of the first and second channels are located at the first side of the conversion seat 701, and the other ends of the first and second channels are located at the second side of the conversion seat 701. The conversion seat 701 is mounted on a side surface of the bottom case 101, for example, fastened to the side surface of the bottom case 101 by a screw, and the first side surface of the conversion seat 701 is attached to the side surface of the bottom case 101, so that an outlet of the first channel of the first side surface of the conversion seat 701 is communicated with an inlet T101 of the air inlet channel T10 of the side surface of the bottom case 101, and an inlet of the second channel of the first side surface of the conversion seat 701 is communicated with an outlet T112 of the air outlet channel T11 of the side surface of the bottom case 101.
The first pressure gauge 702 is communicated with the first channel, the pressure in the first channel can be detected and displayed through the first pressure gauge 702, so that the air inlet pressure is obtained, and the second pressure gauge 703 is communicated with the second channel and used for detecting the pressure in the second channel, so that the air outlet pressure is obtained.
Referring to fig. 2 and 6, in one embodiment of the present invention, the air conditioner further includes a display 41, where the display 41 is disposed on the cover 403 and is electrically connected to the control unit 60, so that the control unit 60 can calculate state information such as the opening of the air-operated control valve according to the electric signal fed back by the potentiometer 204, and display the state information on the display 41, so that a field person can intuitively know the state information of the air-operated control valve through the display 41.
Referring to fig. 2-4, in some embodiments of the present invention, a moveable member 50 is disposed within the enclosure 10, the moveable member 50 being configured to move between a first position and a second position, the potentiometer 204 being disposed on the moveable member 50. The driven gear 203 is engaged with the driving gear 202 when the movable member 50 is located at the first position, and the driven gear 203 is separated from the driving gear 202 when the movable member 50 moves from the first position to the second position.
That is, the potentiometer 204 is disposed on the movable member 50 and can move along with the movable member 50, when the movable member 50 is located at the first position, the potentiometer 204 on the movable member 50 is relatively close to the feedback shaft 201, the driven gear 203 on the rotating shaft of the potentiometer 204 just meshes with the driving gear 202 on the feedback shaft 201, and at this time, the feedback shaft 201 rotates along with the action of the actuator, so that the driving gear 202 and the driven gear 203 can be driven to rotate, and the potentiometer 204 generates an electrical signal. When the movable member 50 moves from the first position to the second position, the potentiometer 204 on the movable member 50 is far away from the feedback shaft 201, and the driven gear 203 on the rotating shaft of the potentiometer 204 is separated from the driving gear 202 on the feedback shaft 201, and at this time, the driven gear 203 will not rotate along with the feedback shaft 201.
Since there may be a case where the initial angle of the rotation shaft of the potentiometer 204 does not correspond to the current opening of the pneumatic control valve before use, and thus the electric signal output from the potentiometer 204 does not correspond to the opening of the pneumatic control valve, it is necessary to adjust the initial angle of the rotation shaft of the potentiometer 204, and if the potentiometer 204 is relatively fixed to the feedback shaft 201, it is necessary to adjust the relationship between the initial angle of the rotation shaft of the potentiometer 204 and the opening of the pneumatic control valve during assembly, and thus the adjustment is very inconvenient.
In this embodiment, the potentiometer 204 is mounted on the movable member 50 and can move along with the movable member 50, so when the initial angle of the rotating shaft of the potentiometer 204 needs to be adjusted, the acting force can be applied to move the movable member 50 from the first position to the second position, at this time, the driven gear 203 on the rotating shaft of the potentiometer 204 is separated from the driving gear 202 on the feedback shaft 201, and then the driven gear 203 is manually shifted, so that the driven gear 203 drives the rotating shaft of the potentiometer 204 to rotate, and then the initial angle of the rotating shaft of the potentiometer 204 is adjusted to correspond to the current opening of the pneumatic adjusting valve, for example, the current opening of the pneumatic adjusting valve is zero, and correspondingly, the initial angle of the rotating shaft of the potentiometer 204 is reset to zero, so that the electric signal output by the potentiometer 204 can correspond to the opening of the pneumatic adjusting valve, and finally, the movable member 50 is returned to the first position from the second position, so that the driven gear 203 on the rotating shaft of the potentiometer 204 and the driving gear 202 on the feedback shaft 201 can be restored to the meshed state.
Referring to fig. 3 to 4, in one embodiment of the present invention, the movable member 50 includes a pivoting member 501 and a link arm 502, wherein the pivoting member 501 extends in the up-down direction and is pivotally provided on the bottom case 101 about its own axis between the first position and the second position; one end of a link arm 502 is connected to the pivot member 501 to rotate with the pivot member 501, and the other end of the link arm 502 extends in a horizontal direction; the potentiometer 204 is disposed at the other end of the linkage arm 502.
That is, the pivot member 501 is vertically provided on the bottom chassis 101 and is rotatable about its own axis, while the link arm 502 is horizontally arranged, and one end of the link arm 502 is connected to the pivot member 501, and when the pivot member 501 rotates about its own axis, the link arm 502 follows the pivot member 501. The potentiometer 204 is disposed at the other end of the linkage arm 502, and when the linkage arm 502 rotates, the potentiometer 204 can be driven to rotate along the axis of the pivot 501.
In a specific operation, an acting force can be applied to the linkage arm 502, so as to drive the linkage arm 502 to rotate around the axis of the pivot piece 501, for example, when the linkage arm rotates clockwise, the potentiometer 204 gradually approaches the feedback shaft 201, so that the driven gear 203 is meshed with the driving gear 202, and when the linkage arm rotates anticlockwise, the potentiometer 204 gradually leaves the feedback shaft 201, so that the driven gear 203 is separated from the driving gear 202, the rotation is reliable, and the meshing or the separation of the driven gear 203 and the driving gear 202 can be ensured.
Referring to fig. 3 to 4, in one embodiment of the present invention, the device further includes an elastic restoring member 21, where the elastic restoring member 21 is disposed between the movable member 50 and the bottom case 101, and normally drives the movable member 50 to move from the second position to the first position.
That is, the elastic restoring member 21 is provided between the movable member 50 and the bottom chassis 101, and can provide an elastic force acting on the movable member 50 such that the movable member 50 can approach the feedback shaft 201 without other external force, thereby maintaining the driven gear 203 in engagement with the driving gear 202.
In particular use, when the movable member 50 is driven to move to the second position by applying the force, the driven gear 203 is separated from the driving gear 202, the elastic restoring member 21 deforms, and after the force is removed, the elastic restoring member 21 releases the restoring force, so that the automatic movable member 50 is forced to return to the first position from the second position, and the driven gear 203 is in mesh with the driving gear 202, so that the use is more convenient, and the meshing of the driven gear 203 and the driving gear 202 is ensured to be more reliable.
Referring to fig. 3 to 4, in one embodiment of the present invention, the pivoting member 501 includes a positioning rod 5011 and a pivoting sleeve 5012, wherein a lower end of the positioning rod 5011 is fixed on the bottom shell 101, in the example of fig. 3, a boss 1011 protruding upward is provided in the bottom shell 101, a threaded hole is provided on a top surface of the boss 1011, and an external thread 5012 in threaded engagement with the threaded hole is provided at a lower end of the positioning rod 5011; the pivot sleeve 5012 is sleeved at the upper end of the positioning rod 5011 and can pivot between the first position and the second position around the axis of the pivot sleeve; the one end of the linkage arm 502 is fixedly connected with the pivot sleeve 5012 in the circumferential direction.
That is, the positioning lever 5011 is vertically and fixedly installed in the bottom case 101, the pivot housing 5012 is fitted over the positioning lever 5011 and can rotate along its own axis, and the link arm 502 is connected to the pivot housing 5012 to rotate with the pivot housing 5012, so that it is convenient to assemble, and the pivot housing 5012 rotates more smoothly and reliably.
In one embodiment of the present invention, the elastic restoring member 21 is a torsion spring, the torsion spring is sleeved outside the pivot sleeve 5012, one end of the torsion spring is fixed to the linkage arm 502, and the other end of the torsion spring is fixed to the bottom shell 101, so that when a force is applied to the linkage arm 502 to rotate from the first position to the second position, the torsion spring is torsionally deformed, and when the force is removed, the torsion spring can restore to deform to force the linkage arm 502 to return from the second position to the first position, so that the restoring performance is more reliable.
Specifically, in order to facilitate the installation of the torsion spring, a stop portion 5021 is formed on the side surface of the linkage arm 502 in a protruding manner, and one end of the torsion spring abuts against the stop portion 5021, so that the two ends of the torsion spring are conveniently fixed with the linkage arm 502 respectively.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (7)
1. An electro-pneumatic valve positioner, comprising:
The device comprises a closed shell, wherein a gas channel is formed in the closed shell, one end of the gas channel is positioned in the closed shell, and the other end of the gas channel is positioned outside the closed shell;
The feedback mechanism comprises a feedback shaft, a potentiometer, a driving gear and a driven gear, wherein the feedback shaft can be pivoted on the closed shell and extends along the up-down direction, the upper end of the feedback shaft is positioned in the closed shell, and the lower end of the feedback shaft extends out of the closed shell to form a connecting end; the potentiometer is arranged in the shell, the driving gear is arranged at the upper end of the feedback shaft, and the driven gear is arranged on the rotating shaft of the potentiometer and meshed with the driving gear;
the piezoelectric valve is arranged in the closed shell, and an air port of the piezoelectric valve is communicated with one end of the air channel;
The control unit is arranged in the closed shell and is electrically connected with the potentiometer and the piezoelectric valve, and is used for controlling the piezoelectric valve according to signals of the potentiometer;
The closed shell comprises a bottom shell and a face shell, a first area and a second area are arranged in the bottom shell, the gas channel is formed in the first area, one end of the gas channel is located on the top surface of the bottom shell, the other end of the gas channel is located on the side surface of the bottom shell, the feedback mechanism is arranged in the second area, and the piezoelectric valve is mounted in the first area and located above the gas channel; the surface shell cover is arranged on the bottom shell and is locked and fixed with the bottom shell through a fastener, and a sealing ring is arranged between the surface shell and the bottom shell;
the overhead seat is arranged in the bottom shell and above the piezoelectric valve and the feedback mechanism, and the control unit is arranged on the overhead seat;
A movable member is arranged in the closed shell and is configured to move between a first position and a second position, and the potentiometer is arranged on the movable member; the driven gear is engaged with the driving gear when the movable member is located at the first position, and the driven gear is separated from the driving gear when the movable member moves from the first position to the second position.
2. The electro-pneumatic valve positioner according to claim 1, wherein the overhead seat comprises a bracket, a bottom box and a surface cover, the lower end of the bracket is fixed on the bottom shell, the bottom box is mounted on the upper end of the bracket, one side of the bottom box is provided with a wiring terminal group used for being connected with the piezoelectric valve and the potentiometer, the control unit is mounted in the bottom box, and the surface cover is arranged on the bottom box so as to seal the control unit in the bottom box.
3. The electro-pneumatic valve positioner according to claim 1, wherein the gas channels comprise an inlet channel, an outlet channel and an exhaust channel, the inlet of the inlet channel, the outlet of the outlet channel and the outlet of the exhaust channel being located on the side of the bottom shell, the outlet of the inlet channel, the inlet of the outlet channel and the inlet of the exhaust channel being located on the top surface of the bottom shell;
the bottom surface of the piezoelectric valve is provided with an air inlet, an air outlet and an air outlet, the outlet of the air inlet channel is connected with the air inlet of the piezoelectric valve, the inlet of the air outlet channel is connected with the air outlet of the piezoelectric valve, and the inlet of the air outlet channel is connected with the air outlet of the piezoelectric valve.
4. The electro-pneumatic valve positioner according to claim 1, wherein the moving member comprises:
a pivot member extending in an up-down direction and provided on the bottom case pivotably about its own axis between the first position and the second position;
a link arm, one end of which is connected with the pivoting member to rotate with the pivoting member, and the other end of which extends in a horizontal direction;
The potentiometer is arranged at the other end of the linkage arm.
5. The electro-pneumatic valve positioner according to claim 4, further comprising:
the elastic reset piece is arranged between the movable piece and the bottom shell and is used for normally driving the movable piece to move from the second position to the first position.
6. The electro-pneumatic valve positioner according to claim 5, wherein the pivot member comprises:
The lower end of the positioning rod is fixed on the bottom shell;
the pivot sleeve is sleeved at the upper end of the positioning rod and can pivot between the first position and the second position around the axis of the pivot sleeve;
And one end of the linkage arm is fixedly connected with the pivoting sleeve in the circumferential direction.
7. The electro-pneumatic valve positioner according to claim 6, wherein the elastic return member is a torsion spring, the torsion spring is sleeved outside the pivot sleeve, one end of the torsion spring is fixed with the linkage arm, and the other end of the torsion spring is fixed with the bottom shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771908.0A CN108612897B (en) | 2018-07-13 | 2018-07-13 | Positioner for electric valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771908.0A CN108612897B (en) | 2018-07-13 | 2018-07-13 | Positioner for electric valve |
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| CN108612897A CN108612897A (en) | 2018-10-02 |
| CN108612897B true CN108612897B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810771908.0A Active CN108612897B (en) | 2018-07-13 | 2018-07-13 | Positioner for electric valve |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110594474B (en) * | 2019-10-08 | 2024-05-07 | 深圳市摩控自动化设备有限公司 | Valve positioner gas circuit switching device and valve positioner with same |
| CN110594480A (en) * | 2019-10-08 | 2019-12-20 | 深圳市摩控自动化设备有限公司 | Flame-proof type intelligent positioner |
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|---|---|
| CN108612897A (en) | 2018-10-02 |
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