CN208565730U - Electropneumatic valve positioner - Google Patents

Abstract

The utility model discloses a kind of electropneumatic valve positioners, including closing shell, feedback mechanism, piezo electric valve and control unit, close and are formed with gas passage in shell, and one end of gas passage is located in closing shell, and the other end is located at outside closing shell；Feedback mechanism includes resetting shaft, potentiometer, driving gear and driven gear, and resetting shaft is pivotably located on closing shell and vertically extends, and resetting shaft upper end is located in closing shell, and the self-enclosed shell in the lower end of resetting shaft is stretched out to form connecting pin；Potentiometer is set in shell, and the upper end of resetting shaft is arranged in driving gear, and driven gear is set in the shaft of potentiometer and engages with driving gear；Piezo electric valve is set in closing shell, and the port of piezo electric valve is connected with one end of gas passage；Control unit is set in closing shell and is electrically connected with potentiometer and piezo electric valve, to be controlled according to the signal of potentiometer piezo electric valve.The electropneumatic valve positioner of the utility model is, it can be achieved that accurate feedback regulation control.

Description

Electropneumatic valve positioner

Technical field

The utility model relates to electrical valve technical field more particularly to a kind of electropneumatic valve positioners.

Background technique

Electropneumatic valve positioner is the main accessories of pneumatic control valve, is usually matched with pneumatic control valve, electrical valve Door holder is connected with actuator (generally cylinder etc.), and actuator is connected with pneumatic control valve, is pushed by actuator pneumatic Valve rod in regulating valve is mobile and then changes opening size, and electropneumatic valve positioner and actuator link, and then will pneumatically adjust The displacement of valve rod of section valve is converted to electric signal, and the electric signal is fed back to controller, and controller believes the electric signal and setting It number is compared, when the two has deviation, controller changes its output signal for arriving actuator, acts actuator, and then adjust The aperture of pneumatic control valve is saved to setting value.In other words, valve positioner is the signal using displacement of valve rod as feedback control, into And realize the feedback control to pneumatic control valve.

In the related technology, the displacement signal of valve rod is converted into electric signal by feedback mechanism by electropneumatic valve positioner, should Electric signal is the aperture for reacting pneumatic control valve, be that is to say, the aperture of the electric signal and pneumatic control valve is in corresponding relationship.So And feedback mechanism is inaccurate to the measurement of displacement signal, that is, electric signal of its output inaccurately reacts pneumatic control valve Current aperture causes the control precision of pneumatic control valve low, in addition, its structure is complicated, assembles and difficult in maintenance, at high cost.

Utility model content

The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality It is to propose a kind of electropneumatic valve positioner with novel purpose.

To achieve the above object, according to the electropneumatic valve positioner of the utility model embodiment, comprising:

Shell is closed, is formed with gas passage in the closing shell, one end of the gas passage is located at the closing In shell, the other end of the gas passage is located at outside the closing shell；

Feedback mechanism, the feedback mechanism include resetting shaft, potentiometer, driving gear and driven gear, the resetting shaft It is pivotably located on the closing shell and vertically extends, the resetting shaft upper end is located in the closing shell, institute The lower end for stating resetting shaft is stretched out from the closing shell to form connecting pin；The potentiometer is set in the shell, described Driving gear is arranged in the upper end of the resetting shaft, the driven gear be set in the shaft of the potentiometer and with the master Moving gear engagement；

Piezo electric valve, the piezo electric valve are set in the closing shell, the port of the piezo electric valve and the gas passage Described one end be connected；

Control unit, described control unit are set in the closing shell and are electrically connected with the potentiometer and piezo electric valve It connects, to be controlled according to the signal of the potentiometer the piezo electric valve.

According to electropneumatic valve positioner provided by the embodiment of the utility model, the connecting pin of resetting shaft be can connect to execution Device, actuator can drive resetting shaft to rotate when acting, and resetting shaft rotation driving driving gear rotation, driving gear drives driven Gear rotation, driven gear are further driven to the shaft rotation of potentiometer, and potentiometer can produce electric signal, and controller is in basis The electric signal is compared with setting signal, and then is controlled actuator and carried out feedback regulation.In this way, passing through resetting shaft, driving tooth Wheel, driven gear and potentiometer, which form feedback mechanism, can be converted to the displacement of actuator accurate electric signal, feedback As a result relatively reliable, so that controller can accurately control actuator according to the electric signal, reach accurate feedback regulation Control.

In addition, can also have following additional technology according to the electropneumatic valve positioner of the utility model above-described embodiment Feature:

One embodiment according to the present utility model, the closing shell include:

Bottom case, the bottom case is interior to have first area and second area, and the gas passage is formed in the first area In, described one end of the gas passage is located at the top surface of the bottom case, and the other end of the gas passage is located at described The side of bottom case, the feedback mechanism are set in the second region, and the piezo electric valve is installed on the first area and is located at The top of the gas passage；

Face-piece, the face-piece are covered on the bottom case and are locked by fastener and the bottom case, the face-piece Sealing ring is set between the bottom case.

One embodiment according to the present utility model, further includes aerial seat, the aerial mounting be located in the bottom case and Above the piezo electric valve and feedback mechanism, described control unit is set on the aerial seat.

One embodiment according to the present utility model, the aerial seat include bracket, back box and cover, under the bracket The bottom case is fixed at end, and the back box is installed on the upper end of the bracket, and the side of the back box be equipped with to it is described Piezo electric valve and the terminals subgroup of potentiometer connection, described control unit are installed in the back box, and the cover is covered on institute It states in back box, described control unit is sealed in the back box.

One embodiment according to the present utility model, the gas passage include that inlet channel, outlet passageway and exhaust are logical The outlet of road, the outlet of the entrance, outlet passageway of the inlet channel and exhaust passage is located at the side of the bottom case, it is described into The entrance of the outlet in gas channel, the entrance of outlet passageway and exhaust passage is located at the top surface of the bottom case；

The bottom surface of the piezo electric valve has air inlet, gas outlet and exhaust outlet, the outlet of the inlet channel and the pressure The air inlet of electric valve is connected, and the entrance of the outlet passageway is connected with the gas outlet of the piezo electric valve, and the exhaust passage enters Mouth is connected with the exhaust outlet of the piezo electric valve.

One embodiment according to the present utility model, the closing shell is interior to be equipped with movable part, and the movable part is constructed At that can move between the first position and the second position, the potentiometer is set on the movable part；

When the movable part is located at first position, the driven gear is engaged with the driving gear, when the activity When part moves to the second position from the first position, the driven gear is separated with the driving gear.

One embodiment according to the present utility model, the movable part include:

Pivotal part, the pivotal part vertically extend and around own axes the first position and the second position it Between be pivotally arranged on the bottom case；

Transmission arm, one end of the transmission arm are connect with the pivotal part, to be rotated with the pivotal part, the transmission arm The other end it is horizontally extending；

The potentiometer is set to the other end of the transmission arm.

One embodiment according to the present utility model, further includes:

Dynamic clamping head and quiet clamping head, the dynamic clamping head and quiet clamping head are located between the movable part and the bottom case, and often drive the work Moving part is moved from the second position to the first position.

One embodiment according to the present utility model, the pivotal part include:

Locating rod, the lower end of the locating rod are fixed on the bottom case；

Pivot sleeve, the pivot sleeve are sheathed on the upper end of the locating rod and around own axes in the first position and Between two positions pivotably；

Described one end of the transmission arm and the circumferentially fixed connection of the pivot sleeve.

One embodiment according to the present utility model, the dynamic clamping head and quiet clamping head are torsional spring, and the torsion spring set is set to the pivot Outside pivoted housing, and one end of the torsional spring is mutually fixed with the transmission arm, and the other end of the torsional spring is mutually fixed with the bottom case.

The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description In become obvious, or recognized by the practice of the utility model.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the structural schematic diagram of the utility model embodiment electropneumatic valve positioner；

Fig. 2 is the exploded view of the utility model embodiment electropneumatic valve positioner；

Fig. 3 is the partially exploded diagram of the utility model embodiment electropneumatic valve positioner；

Fig. 4 is the partial structure diagram of the utility model embodiment electropneumatic valve positioner；

Fig. 5 is the top view of the part-structure of the utility model embodiment electropneumatic valve positioner；

Fig. 6 is the exploded view that seat is maked somebody a mere figurehead in the utility model embodiment electropneumatic valve positioner；

Fig. 7 is the signal for having the piezo electric valve bottom surface there are two gas outlet in the utility model embodiment electropneumatic valve positioner Figure；

Fig. 8 is the signal of the piezo electric valve bottom surface in the utility model embodiment electropneumatic valve positioner with a gas outlet Figure；

Fig. 9 is the structural schematic diagram of another embodiment of the utility model embodiment electropneumatic valve positioner.

Appended drawing reference:

Close shell 10；

Bottom case 101；

Boss 1011；

Face-piece 102；

Inlet channel T10；

Outlet passageway T11；

Feedback mechanism 20；

Resetting shaft 201；

Driving gear 202；

Driven gear 203；

Potentiometer 204；

Dynamic clamping head and quiet clamping head 21；

Piezo electric valve 30；

Aerial seat 40；

Bracket 401；

Back box 402；

Cover 403；

Terminals subgroup 404；

Display screen 41；

Movable part 50；

Pivotal part 501；

Locating rod 5011；

Pivot sleeve 5012；

Transmission arm 502；

Stop section 5021；

Control unit 60；

Pressure meter device 70；

Conversion seat 701；

First pressure gauge 702；

Second pressure gauge 703.

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model Limitation, based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts Every other embodiment obtained, fall within the protection scope of the utility model.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise " " axial direction ", " circumferential direction ", " radial direction " is orientation based on the figure Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model System.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.The meaning of " plurality " is two or two in the description of the present invention, More than, unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be Concrete meaning in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.

The electropneumatic valve positioner of the utility model embodiment is described in detail with reference to the accompanying drawings.

Referring to figs. 1 to shown in Fig. 9, according to electropneumatic valve positioner provided by the embodiment of the utility model, including shell is closed Body 10,60 (not shown) of feedback mechanism 20, piezo electric valve 30 and control unit.

Specifically, being formed with gas passage in closing shell 10, one end of the gas passage is located at the closing shell In 10, the other end of the gas passage is located at outside the closing shell 10.The closing shell 10 forms enclosed construction, can be with It plays a protective role to internal feedback mechanism 20, piezo electric valve 30 and control unit 60, such as waterproof, shock resistance etc., preferably, The closing shell 10 can use corrosion-resistant, the higher metal material of intensity.

Feedback mechanism 20 includes resetting shaft 201, potentiometer 204, driving gear 202 and driven gear 203, the resetting shaft 201 are pivotably located on the closing shell 10 and vertically extend, and 201 upper end of resetting shaft is located at the closing shell In body 10, the lower end of the resetting shaft 201 is stretched out from the closing shell 10 to form connecting pin；The potentiometer 204 is arranged In in the shell, the upper end of the resetting shaft 201 is arranged in the driving gear 202, and the driven gear 203 is set to institute It states in the shaft of potentiometer 204 and is engaged with the driving gear 202.

In a particular application, the lower end of resetting shaft 201 can connect to actuator, and actuator connects pneumatic control valve, when When actuator acts, the valve rod of pneumatic control valve can be driven to act, and then adjust the aperture of pneumatic control valve, meanwhile, it executes When device acts, resetting shaft 201 can be driven to rotate, resetting shaft 201 drives driving gear 202 to rotate, and driving gear 202 is into one Step drives driven gear 203 to rotate, finally, driving the shaft of potentiometer 204 to rotate by driven gear 203, in this way, potentiometer 204 can produce electric signal, it is, the displacement of actuator is converted to electric signal.

Piezo electric valve 30 is set in the closing shell 10, and the port of the piezo electric valve 30 is described with the gas passage One end is connected.Control unit 60 is set in the closing shell 10 and is electrically connected with the potentiometer 204 and piezo electric valve 30, To be controlled according to the signal of the potentiometer 204 piezo electric valve 30.Wherein, piezo electric valve 30 is electrical converter Part, such as the piezo electric valve of hoerbiger company.Control unit 60 receives external setting-up signal (such as 4~20mA current signal) And the electric signal that potentiometer 204 is fed back, after electric signal and setting signal comparison, output control signal control piezo electric valve 30 is opened Open or close, the piezo electric valve 30 open Shi Kewei actuator provide high pressure gas so that push actuator movement, actuator again into One step pushes the valve rod of pneumatic control valve, and then adjusts the aperture of pneumatic control valve, in this way, realizing the feedback to pneumatic control valve Control.

According to electropneumatic valve positioner provided by the embodiment of the utility model, the connecting pin of resetting shaft 201 can connect to Actuator, actuator can drive resetting shaft 201 to rotate when acting, the rotation driving driving gear 202 of resetting shaft 201 rotates, main Moving gear 202 drives driven gear 203 to rotate, and driven gear 203 is further driven to the shaft rotation of potentiometer 204, potentiometer 204 can produce electric signal, and controller is being compared according to the electric signal with setting signal, and then control actuator and carry out instead Feedback is adjusted.It can in this way, forming feedback mechanism 20 by resetting shaft 201, driving gear 202, driven gear 203 and potentiometer 204 The displacement of actuator is converted to accurate electric signal, the result of feedback is relatively reliable, so that controller is according to this Electric signal can accurately control actuator, reach accurate feedback regulation control.

It should be noted that potentiometer 204 is converted to electric signal for that will be displaced, which can be using conduction Displacement signal, can be converted into voltage signal by plastic potentiometer 204, and displacement signal is proportional with voltage signal.

Referring to shown in Fig. 2, in one embodiment of the utility model, closing shell 10 includes bottom case 101 and face-piece 102, wherein there is first area and second area, the gas passage is formed in the first area, institute in bottom case 101 The described one end for stating gas passage is located at the top surface of the bottom case 101, and the other end of the gas passage is located at the bottom The side of shell 101, the feedback mechanism 20 are set in the second region, the piezo electric valve 30 be installed on the first area and Positioned at the top of the gas passage.Face-piece 102 is covered on the bottom case 101 and is locked by fastener and the bottom case 101 It fastens, sealing ring is set between the face-piece 102 and the bottom case 101.

That is, being divided into two regions, i.e. first area and second area inside bottom case 101, wherein gas passage shape At in first area, also, piezo electric valve 30 sets in the first region and is located above gas passage, and feedback mechanism 20 is located at the Two regions.Cover 403 and the lid of bottom case 101 form sealing structure after closing, piezo electric valve 30 and feedback mechanism 20 are enclosed in closing In shell 10.

Since described one end of gas passage is located at the top surface of bottom case 101, so, when piezo electric valve 30 is mounted on first area When middle, the port of bottom surface is convenient to be connected to described one end of gas passage.And the other end of gas passage is located at bottom case 101 side is then convenient to connect with actuator.In addition, piezo electric valve 30 can be made by the subregion arrangement in bottom case 101 It is separated from each other with feedback mechanism 20, it is simple and compact for structure, it assembles and easy to maintain.

It further include aerial seat 40, aerial 40 frame of seat in some embodiments of the utility model referring to shown in Fig. 2 It is located in the bottom case 101 and is located at 20 top of the piezo electric valve 30 and feedback mechanism, described control unit 60 is set to described On aerial seat 40.In this way, piezo electric valve 30, feedback mechanism 20, aerial seat 40 can form independent module, also, in closing shell Horizontal and vertical upper arrangement is formed in body 10, structure is simpler compact, assembles and safeguards and is more convenient.

Referring to shown in Fig. 2 and Fig. 6, specifically, aerial seat 40 includes bracket 401, back box 402 and cover 403, the bracket The bottom case 101 is fixed in 401 lower end, and the back box 402 is installed on the upper end of the bracket 401, and the back box 402 Side is equipped with the terminals subgroup 404 to connect with the piezo electric valve 30 and potentiometer 204, and described control unit 60 is installed on In the back box 402, the cover 403 is covered in the back box 402, and described control unit 60 is sealed in the back box In 402.

That is, back box 402 is supported 101 top of bottom case by bracket 401, so that being formed between back box 402 and bottom case 101 Certain space, so that piezo electric valve 30 and feedback mechanism 20 are installed in bottom case 101, in this way, compact-sized, assembling can be made It is convenient.Meanwhile accommodating space is formed in back box 402, control unit 60 is housed in the accommodating space, then and passes through cover 403 lids close in back box 402, that is, may make control unit 60 to be enclosed in back box 402, in this way, can make control unit 60 It is completely isolated with external environment, it plays a good protective effect to control unit 60.And in order to facilitate control unit 60 and piezoelectricity Terminals subgroup 404 is arranged in the side of back box 402, in assembly, by piezo electric valve 30 in the electrical connection of valve 30 and potentiometer 204 And the lead of potentiometer 204 is plugged on the corresponding terminal in the terminals subgroup 404, and piezo electric valve 30 and potentiometer can be realized Being electrically connected between 204 and control unit 60, easy-to-connect.

Referring to shown in Fig. 3 to Fig. 4 and Fig. 7, in one embodiment of the utility model, gas passage includes inlet channel T10, outlet passageway T11 and exhaust passage, the entrance T101 of the inlet channel T10, the outlet T112 of outlet passageway T11 and row The outlet T122 in gas channel is located at the side of the bottom case 101, the outlet T102 of the inlet channel T10, outlet passageway T11 The entrance T121 of entrance T111 and exhaust passage is located at the top surface of the bottom case 101.The bottom surface of piezo electric valve 30 has air inlet 301, gas outlet 302 and exhaust outlet 303,301 phase of air inlet of the outlet T102 and the piezo electric valve 30 of the inlet channel T10 Even, the entrance T111 of the outlet passageway T11 is connected with the gas outlet 302 of the piezo electric valve 30, the entrance of the exhaust passage T121 is connected with the exhaust outlet 303 of the piezo electric valve 30.

In assembling, piezo electric valve 30 is placed on to the first area of back box 402, and make the air inlet of the bottom surface of piezo electric valve 30 Mouthfuls 301, gas outlet 302 and exhaust outlet 303 respectively with the outlet T102 of inlet channel T10, outlet passageway T11 entrance T111 and The entrance T121 of exhaust passage is opposite, recycles fastener (such as screw etc.) that piezo electric valve 30 is locked on bottom case 101 , in this way, the outlet T102 of inlet channel T10 can be connected to the air inlet 301 of piezo electric valve 30, outlet passageway T11's enters Mouth T111 is connected to the gas outlet 302 of piezo electric valve 30, and the entrance T121 of exhaust passage is connected to the exhaust outlet 303 of piezo electric valve 30, Its is easy to assembly.Meanwhile after the assembly is completed, in a particular application, due to the entrance T101 of inlet channel T10, outlet passageway T11 Outlet T112 and the outlet T122 of exhaust passage be located at the side of bottom case 101, so, be convenient to the entrance of inlet channel T10 T101 is connect with air machinery, the outlet T112 of outlet passageway T11 is connect with actuator.

It, can be with when outlet passageway T11 is one it should be noted that outlet passageway T11 can be one or two Connect suitable for the piezo electric valve 30 (as shown in Figure 8) with a gas outlet 302, and then using the gas outlet 302 of the piezo electric valve 30 It is connected to the interface (such as single-acting cylinder) of single interface actuator, realizes the driving of single interface actuator.When outlet passageway T11 is Two (as shown in Figures 3 and 4), can be adapted for tool, there are two the piezo electric valve 30 (as shown in Figure 7) of gas outlet 302, Jin Erli Two interfaces for being connected to double nip actuator correspondingly respectively with two gas outlets 302 of the piezo electric valve 30 are (such as double Active cylinder), realize the driving of double nip actuator.

It further include pressure meter device 70 in one embodiment of the utility model referring to shown in Fig. 9, the pressure dress It sets including conversion seat 701 and first pressure gauge 702 and second pressure gauge 703, is formed with first passage and second in conversion seat 701 Channel, the outlet of the first passage and the entrance of second channel are laid in the first side of the conversion seat 701, and respectively with The outlet T112 of the entrance T101 and outlet passageway T11 of the inlet channel T10 are corresponding；The entrance 7011 of the first passage Outlet 7012 with second channel is laid in the second side of the conversion seat 701, and the first side and second side are opposite It is right.

Adapter 701 is installed on the side of the bottom case 101, the outlet of the first passage and the inlet channel The entrance T101 of T10 is communicated, and the entrance of the second channel is communicated with the outlet T112 of outlet passageway T11.The first pressure Table 702 and second pressure gauge 703 are located at the top surface of conversion seat 701, and the first pressure gauge 702 is connected with the first passage Logical, for detecting the air pressure in the first passage, the second pressure gauge 703 is connected with the second channel, for examining Survey the pressure in the second channel.

That is, one end of first passage and second channel is located at the first side of conversion seat 701, first passage and The other end in two channels is located at the second side of conversion seat 701.Conversion seat 701 is mounted on the side of bottom case 101, such as passes through spiral shell The fastener of nail is fixed on the side of bottom case 101, and the first side of conversion seat 701 and the side of bottom case 101 fit, in this way, The outlet of the first passage of the first side of conversion seat 701 is connected with the entrance T101 of the inlet channel T10 of the side of bottom case 101 It is logical, the outlet T112 of the outlet passageway T11 of the side of the entrance and bottom case 101 of the second channel of the first side of conversion seat 701 It is connected.

First pressure gauge 702 is connected with first passage, can be detected by first pressure gauge 702 and show first passage Interior pressure, and then know admission pressure, and second pressure gauge 703 is connected with second channel, for detecting in second channel Pressure, and then know outlet pressure.

It further include display screen 41 in one embodiment of the utility model, display screen 41 is set referring to shown in Fig. 2 and Fig. 6 It is electrically connected on the cover 403 and with described control unit 60, in this way, control unit 60 can be fed back according to potentiometer 204 Electric signal calculate the status informations such as aperture of pneumatic control valve, and status information is shown by display screen 41, with this so that Field Force can intuitively know the status information of pneumatic control valve by display screen 41.

Shown in referring to Figure 2 to Figure 4, in some embodiments of the utility model, it is equipped with movable part 50 in closing shell 10, The movable part 50 is configured to move between the first position and the second position, and the potentiometer 204 is set to the work On moving part 50.When the movable part 50 is located at first position, the driven gear 203 is engaged with the driving gear 202, when When the movable part 50 moves to the second position from the first position, the driven gear 203 and the driving gear 202 separation.

That is, potentiometer 204 is located on movable part 50 can move with movable part 50, when movable part 50 is located at first When position, the relatively close resetting shaft 201 of potentiometer 204 on movable part 50, the driven gear 203 in the shaft of potentiometer 204 is rigid It is good to be engaged with the driving gear 202 on resetting shaft 201, at this point, resetting shaft 201 follows actuator to act and rotate, can be driven Driving gear 202 and driven gear 203 rotate, so that potentiometer 204 generates electric signal.And when movable part 50 is from first It sets when moving to the second position, the potentiometer 204 on movable part 50 is driven in the shaft of potentiometer 204 far from resetting shaft 201 Gear 203 is then separated with the driving gear 202 on resetting shaft 201, at this point, driven gear 203 will not follow resetting shaft 201 to revolve Turn.

Due to before the use, it is understood that there may be the initial angle of the shaft of potentiometer 204 and currently opening for pneumatic control valve Degree do not correspond to, and then cause potentiometer 204 export electric signal and pneumatic control valve aperture not at corresponding relationship, so, need The initial angle of the shaft of potentiometer 204 is adjusted, and if being relatively solid between potentiometer 204 and resetting shaft 201 Fixed, then need to regulate the initial angle of the shaft of potentiometer 204 and the relationship of pneumatic control valve aperture in assembling, because This, it is extremely inconvenient to adjust.

In the present embodiment, potentiometer 204 is mounted on movable part 50, can be moved with movable part 50, therefore, is needing to adjust When the initial angle of the shaft of nodal potential device 204, it can will apply active force and movable part 50 is made to move to the from first position Two positions, at this point, the driven gear 203 in the shaft of potentiometer 204 is then separated with the driving gear 202 on resetting shaft 201, then Manual toggle driven gear 203 so that driven gear 203 drives the shaft rotation of potentiometer 204, and then adjusts the potentiometer The initial angle of 204 shaft is extremely corresponding with the current aperture of pneumatic control valve, such as the current aperture of pneumatic control valve is Zero, the initial angle zero of the corresponding shaft by potentiometer 204, the then electric signal that potentiometer 204 exports can be adjusted with pneumatic The aperture of valve is saved at corresponding relationship, finally, movable part 50 is back to first position from the second position again, so that potentiometer 204 Shaft on driven gear 203 and resetting shaft 201 on driving gear 202 restore to meshing state, in this way, it is adjusted It is very convenient, disassembly potentiometer 204 etc. is not needed, meanwhile, structure is simple.

Referring to shown in Fig. 3 to Fig. 4, in one embodiment of the utility model, movable part 50 includes pivotal part 501 and connection Swing arm 502, pivotal part 501 vertically extend and around own axes between the first position and the second position pivotably Ground is located on the bottom case 101；One end of transmission arm 502 is connect with the pivotal part 501, to be rotated with the pivotal part 501, The other end of the transmission arm 502 is horizontally extending；Potentiometer 204 is set to the other end of the transmission arm 502.

That is, pivotal part 501 is located at vertically on bottom case 101, and can be rotated around own axes, and transmission arm 502 is horizontally disposed, also, one end of transmission arm 502 is connected on pivotal part 501, when pivotal part 501 is rotated around own axes When, transmission arm 502 follows pivotal part 501 to rotate.And potentiometer 204 is located at the other end of transmission arm 502, then 502 turns of transmission arm When dynamic, potentiometer 204 can be driven to rotate with the axis of pivotal part 501.

Active force when specific operation, can applied on transmission arm 502, driving transmission arm 502 with the axis of pivotal part 501 It is rotated centered on line, such as along when rotating clockwise, potentiometer 204 moves closer to resetting shaft 201, so that driven gear 203 engage with driving gear 202, and when rotating counterclockwise, potentiometer 204 is gradually distance from resetting shaft 201, so that driven tooth Wheel 203 is separated with driving gear 202, and rotation is reliable, it can be ensured that and driven gear 203 is engaged or is separated with driving gear 202, this Outside, structure is simple, easy to assembly.

It further include dynamic clamping head and quiet clamping head 21, the bullet in one embodiment of the utility model referring to shown in Fig. 3 to Fig. 4 Property return unit 21 is located between the movable part 50 and the bottom case 101, and often drives the movable part 50 from the second It sets to the first position and moves.

That is, dynamic clamping head and quiet clamping head 21 is located between movable part 50 and bottom case 101, elastic acting force can be provided, it should Elastic acting force acts on movable part 50, so that movable part 50 can close on resetting shaft under other no external forces 201, so that the holding of driven gear 203 is engaged with driving gear 202.

When specifically used, when application effect power drive movable part 50 moves to the second position, driven gear 203 and master Moving gear 202 separates, and dynamic clamping head and quiet clamping head 21 generates deformation, and after cancelling above-mentioned active force, the release of dynamic clamping head and quiet clamping head 21 resets, into And automatic movable part 50 is forced to be back to first position from the second position, so that driven gear 203 is nibbled with the recovery of driving gear 202 It closes, in this way, its is more convenient to use, and, it is ensured that driven gear 203 engages relatively reliable with driving gear 202.

Referring to shown in Fig. 3 to Fig. 4, in one embodiment of the utility model, pivotal part 501 include locating rod 5011 and Pivot sleeve 5012, the lower end of locating rod 5011 is fixed on the bottom case 101, is equipped in Fig. 3 example, in bottom case 101 upward The boss 1011 of protrusion, the top surface of the boss 1011 are equipped with threaded hole, and the lower end of the locating rod 5011 is equipped with and the spiral shell The external screw thread 5012 that pit is threadedly engaged；Pivot sleeve 5012 is sheathed on the upper end of the locating rod 5011 and around own axes in institute It states between first position and the second position pivotably；Described one end of transmission arm 502 and the circumferentially fixed company of the pivot sleeve 5012 It connects.

That is, locating rod 5011 is fixedly mounted on vertically in bottom case 101,5012 sets of pivot sleeve in locating rod 5011 And can be rotated along own axes, and transmission arm 502 is connected and is rotated in pivot sleeve 5012 with pivot sleeve 5012, in this way, it is assembled It is convenient, also, the rotation of pivot sleeve 5012 is more smoothly reliable.

In one embodiment of the utility model, dynamic clamping head and quiet clamping head 21 is torsional spring, and the torsion spring set is set to the pivot Outside set 5012, and one end of the torsional spring is fixed with 502 phase of transmission arm, the other end of the torsional spring and the bottom case 101 Mutually fixed, in this way, applying active force when rotating it from first position to the second position, torsional spring is turned round Turn deformation, and when cancelling active force, torsional spring can restore deformation and transmission arm 502 is forced to be back to first from the second position It sets, reseting performance is relatively reliable.

Specifically, the side protrusion of transmission arm 502 is formed with stop section 5021, torsional spring for the ease of the installation of torsional spring Described one end offsets with the stop section 5021, in this way, the both ends for being convenient to torsional spring are fixed with transmission arm 502 respectively.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into Row combination and combination.

The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. a kind of electropneumatic valve positioner characterized by comprising

Shell is closed, is formed with gas passage in the closing shell, one end of the gas passage is located at the closing shell Interior, the other end of the gas passage is located at outside the closing shell；

Feedback mechanism, the feedback mechanism include resetting shaft, potentiometer, driving gear and driven gear, and the resetting shaft can pivot Turn to be located on the closing shell and vertically extend, the resetting shaft upper end is located in the closing shell, described anti- The lower end for presenting axis is stretched out from the closing shell to form connecting pin；The potentiometer is set in the shell, the active Gear is arranged in the upper end of the resetting shaft, the driven gear be set in the shaft of the potentiometer and with the driving tooth Wheel engagement；

Piezo electric valve, the piezo electric valve are set in the closing shell, the institute of the port of the piezo electric valve and the gas passage One end is stated to be connected；

Control unit, described control unit are set in the closing shell and are electrically connected with the potentiometer and piezo electric valve, use To be controlled according to the signal of the potentiometer the piezo electric valve.

2. electropneumatic valve positioner according to claim 1, which is characterized in that the closing shell includes:

Bottom case, the bottom case is interior to have first area and second area, and the gas passage is formed in the first area, institute The described one end for stating gas passage is located at the top surface of the bottom case, and the other end of the gas passage is located at the bottom case Side, the feedback mechanism are set in the second region, and the piezo electric valve is installed on the first area and is located at the gas The top in body channel；

Face-piece, the face-piece are covered on the bottom case and are locked by fastener and the bottom case, the face-piece and institute It states and sealing ring is set between bottom case.

3. electropneumatic valve positioner according to claim 2, which is characterized in that further include aerial seat, the aerial mounting It is located in the bottom case and is located above the piezo electric valve and feedback mechanism, described control unit is set on the aerial seat.

4. electropneumatic valve positioner according to claim 3, which is characterized in that the aerial seat include bracket, back box and The bottom case is fixed in cover, the lower end of the bracket, and the back box is installed on the upper end of the bracket, and the one of the back box Side is equipped with the terminals subgroup to connect with the piezo electric valve and potentiometer, and described control unit is installed in the back box, The cover is covered in the back box, and described control unit is sealed in the back box.

5. electropneumatic valve positioner according to claim 2, which is characterized in that the gas passage include inlet channel, Outlet passageway and exhaust passage, the outlet of the entrance, outlet passageway of the inlet channel and the outlet of exhaust passage are located at described The side of bottom case, the entrance of the outlet of the inlet channel, the entrance of outlet passageway and exhaust passage are located at the top of the bottom case Face；

The bottom surface of the piezo electric valve has air inlet, gas outlet and exhaust outlet, the outlet of the inlet channel and the piezo electric valve Air inlet be connected, the entrance of the outlet passageway is connected with the gas outlet of the piezo electric valve, the entrance of the exhaust passage and The exhaust outlet of the piezo electric valve is connected.

6. electropneumatic valve positioner according to claim 2, which is characterized in that movable part is equipped in the closing shell, The movable part is configured to move between the first position and the second position, and the potentiometer is set to the movable part On；

When the movable part is located at first position, the driven gear is engaged with the driving gear, when the movable part from When the first position moves to the second position, the driven gear is separated with the driving gear.

7. electropneumatic valve positioner according to claim 6, which is characterized in that the movable part includes:

Pivotal part, the pivotal part vertically extend and can between the first position and the second position around own axes It is pivotally located on the bottom case；

Transmission arm, one end of the transmission arm are connect with the pivotal part, with the pivotal part rotate, the transmission arm it is another One end is horizontally extending；

The potentiometer is set to the other end of the transmission arm.

8. electropneumatic valve positioner according to claim 7 adjustment mechanism, which is characterized in that further include:

Dynamic clamping head and quiet clamping head, the dynamic clamping head and quiet clamping head are located between the movable part and the bottom case, and often drive the movable part It is moved from the second position to the first position.

9. electropneumatic valve positioner according to claim 8 adjustment mechanism, which is characterized in that the pivotal part includes:

Locating rod, the lower end of the locating rod are fixed on the bottom case；

Pivot sleeve, the pivot sleeve are sheathed on the upper end of the locating rod and around own axes in the first position and second Between setting pivotably；

Described one end of the transmission arm and the circumferentially fixed connection of the pivot sleeve.

10. electropneumatic valve positioner according to claim 9 adjustment mechanism, which is characterized in that the dynamic clamping head and quiet clamping head For torsional spring, the torsion spring set is set to outside the pivot sleeve, and one end of the torsional spring is mutually fixed with the transmission arm, the torsional spring The other end mutually fixed with the bottom case.