CN2733433Y - Filter screen, throttle valve in electric-air valve positioner - Google Patents
Filter screen, throttle valve in electric-air valve positioner Download PDFInfo
- Publication number
- CN2733433Y CN2733433Y CN 200420012594 CN200420012594U CN2733433Y CN 2733433 Y CN2733433 Y CN 2733433Y CN 200420012594 CN200420012594 CN 200420012594 CN 200420012594 U CN200420012594 U CN 200420012594U CN 2733433 Y CN2733433 Y CN 2733433Y
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- China
- Prior art keywords
- filter screen
- air
- utility
- model
- throttle valve
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- Expired - Fee Related
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Abstract
The utility model discloses a filter screen and a throttle valve in an electric-air valve positioner, which has a new structure and comprises an air inlet, a filter screen, a throttle valve and an air outlet. The utility model is characterized in that the utility model adopts the structure that a mounting bolt is connected with the shell body of the electric-air valve positioner, and the cylindrical filter screen and the air inlet are arranged on a threaded stud of the mounting bolt and are communicated with an air supply pipe of an air source; the air outlet is arranged on a fixed ring, the fixed ring is connected with the mounting bolt in a thread mode, and the throttle valve is arranged in the fixed ring; the cylindrical filter screen aims to prevent the throttle valve from being blocked by dust and oil stain, so that the normal operation of the electric-air valve positioner can be ensured. The utility model has the advantage of good sealing performance, the dust is difficult to invade the environment of installation and use, thereby, troubles can be reduced. The filter screen and the throttle valve are arranged on the threaded stud, spares can be changed conveniently, and the spares can be maintained and repaired easily. The cylindrical filter screen is fixed on the threaded stud, and has the advantages of good structural stability and firm installation, the utility model can not generate position change or fall easily, and simultaneously, the utility model has a large filtering area.
Description
Technical field
The utility model relates to the valve positioner in the industrial process automation instrument, more particularly, relates to electricity-pneumatic valve positioner.
Background technology
The dc signal of electricity-pneumatic valve positioner receiving computer or electronic controller, output pneumatic signal is gone into actuator, by the control system requirement, adjusts the aperture of valve.Electricity-pneumatic valve positioner, form by electronic circuit and pneumatic circuit, wherein the diameter of throttling valve is very little in the pneumatic circuit, has only 0.3mm, product with Finland a company is an example, its relevant inner structure as shown in Figure 3, pressurized air is entered by air intake opening 52, through sheet screen pack 31, through little shell 34 cavitys, cross throttling valve 53 again, discharge by gas outlet 55, throttling valve 53 is contained in the fixture 33, fixture 33 is located in the little shell 34, has rubber blanket 32 to seal, and little shell 34 links to each other with the steady arm housing, this kind structure is that screen pack 31 is the branch body structure with throttling valve 53, adopt rubber blanket 32, sealing is not good at, and dust in the source of the gas in the pressurized air and electricity-pneumatic valve positioner erecting stage environment is abominable, make the little hole plug of diameter 0.3mm of throttling valve sometimes, make electricity-pneumatic valve positioner cisco unity malfunction, cause automation control system malfunctioning, even lead to the industrial accident generation.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of prior art, and a kind of screen pack, throttling valve that structure connects that improve is provided.
The fundamental diagram of electricity-pneumatic valve positioner as shown in Figure 2.The torquer coil 1 that is arranged in permanent magnet 2 produces the proportional moment of passing through with coil of marking current, and this moment loading is on balance beam 3.Feedback spring 4 produces an opposing torque on balance beam 3, this opposing torque is corresponding with the corner of resetting shaft.By cam 6 and lever 7 corner of resetting shaft 5 is transformed into the displacement of feedback spring 4 lower ends, this displacement and corner are proportional.
The moment balance whether on the balance beams 3 is detected at spray angle 8.Balance beam 3 is with shut-off nozzle 8 when given signal increases, and the nozzle internal pressure will raise this moment, and end pressure raises on the piston of diaphragm cylinder 9 simultaneously, and the spool of girder 10 and pilot valve 11 will move down.Pilot valve 11 will order about the upper end of air flow cylinder 12 pistons, and the lower end air will be discharged by the exhausr port of pilot valve 11.Because the pressure reduction at the piston two ends of cylinder 12 makes piston overcome friction and running torque.Make driving shaft 5 rotations, its corner is corresponding with a given signal accurately, and the moment on the balance beam 3 is in balance at this moment.Internal feedback spring 13 produces a negative feedback between one-level amplifier and two-stage amplifier.The one-level amplification comprises nozzle 8 throttling valve 53 and diaphragm cylinder 9, and the secondary amplification comprises pilot valve 11 and cylinder 12.Can utilize to change the dynamic response that the position of feedback spring 4 and 13 on balance beam 3 changes steady arm, make it to adapt to the cylinder of different model.Zero-bit is adjusted available zeroing nut 15 and is regulated.Full scale is adjusted the available potentiometer that is positioned on the circuit board 16 and is regulated.
Pressurized air is gone into air intake opening, through filter screen 51, crosses throttling valve 53, is discharged by the gas outlet.
The utility model comprises air intake opening, screen pack, throttling valve, gas outlet, it is characterized in that, adopt erection bolt 50 to link to each other with electricity-pneumatic valve positioner housing, tubular screen pack 51 is fixed on the double-screw bolt of erection bolt 50, be provided with cavity in the double-screw bolt of erection bolt 50, air intake opening 52 is located on the double-screw bolt of erection bolt 50, communicate with the source of the gas air supply pipe, gas outlet 55 is located on the set collar 54, set collar 54 links to each other with the double-screw bolt of erection bolt 50 is terminal with thread forms, and throttling valve 53 is located in the set collar 54.
The utility model advantage:
1, adopt the erection bolt mode to link to each other with housing, good airproof performance, instrument installs, uses on-the-spot environment dust to be difficult to immerse, and can reduce fault and take place.
2, tubular screen pack and throttling valve are contained on the double-screw bolt of a bolt, and parts replacement is convenient, and Maintenance and Repair are easy.
3, the tubular screen pack is fixed on the double-screw bolt of erection bolt, and its stability of structure is good, installs firmly, is not easy displacement, comes off, big, effective advantage that the while has filter area again.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is electricity-pneumatic valve positioner fundamental diagram.
Fig. 3 is electricity-pneumatic valve positioner Finland one product screen pack, throttling valve structural representation.
Torquer coil 1 is arranged, permanent magnet 2, balance beam 3, feedback spring 4, resetting shaft 5 among the figure, cam 6, lever 7, nozzle 8, diaphragm cylinder 9, girder 10, pilot valve 11, cylinder 12, internal feedback spring 13, zeroing nut 15, circuit board 16, sheet screen pack 31, rubber gasket 32, fixture 33, little shell 34, erection bolt 50, tubular screen pack 51, compressed air inlet port 52, throttling valve 53, set collar 54, gas outlet 55, the threaded together spiral shell edge of a knife 56 on the set collar 54.
Embodiment
The dc signal of electricity-pneumatic valve positioner receiving computer or electronic controller, output pneumatic signal, go into actuator, requirement by control system, in time adjust the aperture of valve, the demand that adapts to production run, screen pack in the pneumatic circuit in electricity-pneumatic valve positioner, throttling valve has vital role to guaranteeing electricity-pneumatic valve positioner operate as normal, throttling valve 53 is packed in the set collar 54, use screwdriver, the double-screw bolt that is screwed into erection bolt 50 by the spiral shell edge of a knife 56 usefulness screwdrivers is not held, and tubular screen pack 51 is welded on the double-screw bolt of erection bolt 50, is covered with air intake opening 52, erection bolt 50 links to each other with electricity-pneumatic valve positioner housing with thread forms, pressurized air filters through tubular screen pack 51, removes dust, behind the greasy dirt, go into air intake opening 52, bolt internal cavity through erection bolt 50, to throttling valve 53, after the throttling, discharge by gas outlet 55.
Claims (1)
1, screen pack in the electricity-gas valve positioner, throttling valve, comprise air intake opening, screen pack, throttling valve, the gas outlet, it is characterized in that, adopt erection bolt (50) to link to each other with the electricity-gas valve positioner housing, tubular screen pack (51) is fixed on the double-screw bolt of erection bolt (50), be provided with cavity in the double-screw bolt of erection bolt (50), air intake opening (52) is located on the double-screw bolt of erection bolt (50), communicate with the source of the gas air supply pipe, gas outlet (55) is located on the set collar (54), set collar (54) links to each other with the double-screw bolt of erection bolt (50) is terminal with thread forms, and throttling valve (53) is located in the set collar (54).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420012594 CN2733433Y (en) | 2004-10-02 | 2004-10-02 | Filter screen, throttle valve in electric-air valve positioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420012594 CN2733433Y (en) | 2004-10-02 | 2004-10-02 | Filter screen, throttle valve in electric-air valve positioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2733433Y true CN2733433Y (en) | 2005-10-12 |
Family
ID=35069273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420012594 Expired - Fee Related CN2733433Y (en) | 2004-10-02 | 2004-10-02 | Filter screen, throttle valve in electric-air valve positioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2733433Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858457A (en) * | 2010-03-26 | 2010-10-13 | 潘辉义 | Intelligent electropneumatic valve positioner and control system |
-
2004
- 2004-10-02 CN CN 200420012594 patent/CN2733433Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858457A (en) * | 2010-03-26 | 2010-10-13 | 潘辉义 | Intelligent electropneumatic valve positioner and control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |