CN221075443U - Pneumatic valve stop device - Google Patents

Abstract

The utility model discloses a pneumatic valve limiting device which comprises a pneumatic mechanism and a controller, wherein the pneumatic mechanism is connected with the controller and also comprises a limiting sensing mechanism and a limiting adjusting mechanism; the limit sensing mechanism comprises a first reed switch and a second reed switch; the contacts of the first reed switch or the second reed switch are connected with the controller; the limit adjusting mechanism is arranged on the valve rod of the pneumatic mechanism and comprises a permanent magnet, the permanent magnet can move up and down by the limit adjusting mechanism, and the permanent magnet is positioned between the first reed pipe and the second reed pipe. The utility model uses a non-contact detection mode, has long service life and high repeated positioning precision, effectively prevents water from penetrating, and greatly reduces the failure rate of the limit switch.

Description

Pneumatic valve stop device

Technical Field

The utility model relates to the technical field of electric valves, in particular to a pneumatic valve limiting device.

Background

Pneumatic valves are used as on-off valves on natural gas pipelines and light hydrocarbon pipelines of petroleum station libraries such as natural gas processing stations, oil-gas combination stations, light hydrocarbon processing stations and the like. The pneumatic valve actuating mechanism adopts compressed air as a power source, has an explosion-proof function, and has the advantages of high safety performance, high corresponding speed, low price and simple control mode, so that the pneumatic valve actuating mechanism is widely applied to petrochemical enterprises.

Whether the pneumatic valve is in place or not is controlled by a limit switch, the valve limiter is a field instrument for displaying the valve position and feeding back signals of an automatic control system, the valve limiter is used for outputting the opening or closing position of the valve according to the signals of the opening or closing quantity (contact point) and is accepted by a program control or accessed by a computer, and the next program is executed after confirmation. Two limit switches are respectively arranged at two ends of the valve movement stroke, and two paths of exhaust of the valve are respectively controlled by the two limit switches, so that automatic gas cut-off after the flashboard is in place is realized.

At present, the existing valve limiter is a mechanical micro-switch, and because the service life of the mechanical micro-switch is short, the failure rate of the pneumatic valve limiter is high, the limit switch is extremely easy to damage after repeatedly colliding with a switch touch part for many times, and in addition, the valve vibrates more frequently in the starting process, so that the phenomenon of position deviation is caused, the touch is inaccurate, and the practicability is reduced.

Publication (bulletin) number: CN212718282U discloses a limit switch protection device for an electric valve actuator, which comprises an actuator body, a touch part body and a limit switch body, wherein the front side of the actuator body is provided with the touch part body, the inner side of the front end of a mounting rod is provided with a fixed slot, the front side of the right end of a gasket is welded with a protective baffle, the front side of the gasket is provided with the limit switch body in a laminating way, the middle part of the right side of the limit switch body is provided with a button, the inner side of the middle part of the mounting rod is slidably connected with a movable block, the middle part of the movable rod, which is far away from one side of the fixed plate, is fixedly connected with a compression rod, and one side of the movable rod, which is close to the fixed plate, is fixedly connected with a second spring. This motorised valve executor limit switch protection device is convenient for protect limit switch, avoids appearing damaging and the phenomenon of position deviation, has guaranteed limit switch's accuracy, and the location installation and the fixed of limit switch of being convenient for have in addition improved the practicality.

This prior art uses mechanical type limit switch, has the problem that life-span is short.

Publication (bulletin) number: CN217603473U discloses an adjustable control pneumatic valve driving device, which comprises a driving mechanism and a movable mechanism, wherein a fixed plate is fixedly connected to the periphery of the inner wall of the driving mechanism near one end, an air pump is fixedly connected to the middle part of one side of the fixed plate, and the periphery of the inner wall of the driving mechanism near the other end is movably inserted with the movable mechanism; this prior art is through choke valve, the locking valve, limit switch, the solenoid valve, the filter relief pressure valve, the locator, pneumatic actuator that is equipped with in the terminal, thereby can realize throttle control through the choke valve, and can effectually realize the locking control of gas tightness through the locking valve, and can implement control to movable mechanism's position through limit switch, realize magnetoelectric on-off control through the solenoid valve, and realize the pressure release regulation and control through the filter relief pressure valve, and then can implement position limit control to movable mechanism through the locator, make the user can make things convenient for signal control through starting the executor.

This prior art uses mechanical type limit switch, has the problem that life-span is short.

Publication (bulletin) number: CN112856020a discloses a pneumatic valve controller, including controller casing, pneumatic solenoid valve, solenoid, pneumatic valve limit switch, solenoid valve end cover and coil end cover, pneumatic solenoid valve fixed mounting is in the inside of solenoid valve installation cavity, through solenoid valve end cover is right solenoid valve installation cavity seals, solenoid fixed mounting is in the inside of coil installation cavity, through coil end cover is right coil installation cavity seals, controller casing integrated into one piece can be right simultaneously pneumatic solenoid valve pneumatic valve limit switch with solenoid coil installs in the controller casing, makes pneumatic solenoid valve with pneumatic valve limit switch is no longer two independent products to make this pneumatic valve controller compact structure, simple to operate.

This prior art uses mechanical type limit switch, has the problem that life-span is short.

In summary, the technical scheme of the above disclosed technology, the technical problems to be solved and the beneficial effects are different from those of the present utility model, and the above disclosed technical documents have no technical teaching for more technical features of the present utility model, the technical problems to be solved and the beneficial effects.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model aims to provide the pneumatic valve limiting device which adopts a non-contact detection mode, has long service life and high repeated positioning precision, avoids the phenomena of damage and position deviation, ensures the accuracy of a limiting switch, is convenient for positioning, mounting and fixing the limiting switch and improves the practicability.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The pneumatic valve limiting device comprises a pneumatic mechanism and a controller, wherein the pneumatic mechanism is connected with the controller, and also comprises a limiting sensing mechanism and a limiting adjusting mechanism;

the limit sensing mechanism comprises a first reed switch and a second reed switch;

The contacts of the first reed switch or the second reed switch are connected with the controller;

The limit adjusting mechanism is arranged on the valve rod of the pneumatic mechanism and comprises a permanent magnet, the permanent magnet can move up and down by the limit adjusting mechanism, and the permanent magnet is positioned between the first reed pipe and the second reed pipe.

The limit sensing mechanism further comprises a bracket part;

The bracket part comprises a diaphyseal bracket, a first sub-bracket and a second sub-bracket;

The front end of the first sub-support or the second sub-support is connected with the backbone support, the first sub-support is arranged above the second sub-support, the first reed switch is arranged at the rear end of the first sub-support, and the second reed switch is arranged at the rear end of the second sub-support.

The upper end and the lower end of the backbone support are connected with the shell.

The limit adjusting mechanism further comprises an up-and-down moving mechanism and a valve position indicating rod;

the permanent magnet is arranged at the front end of the valve position indicating rod, the rear end of the valve position indicating rod is arranged on the up-down moving mechanism, and the up-down moving mechanism is arranged on the valve rod of the pneumatic mechanism.

The up-and-down moving mechanism comprises a hand wheel and a valve rod seat;

The hand wheel is arranged at the upper end of the valve rod, the valve rod seat penetrates through the valve rod, the valve rod is in threaded connection with the valve rod seat, and the rear end of the valve position indication rod is arranged on the valve rod seat; the valve rod seat is limited by the shell, and can only move up and down in the shell.

The shell is fixedly connected with the pneumatic mechanism.

The controller is a PLC (programmable logic controller) or a DCS (distributed control system); the controller controls the start and stop of the pneumatic mechanism.

The first reed switch and the second reed switch are normally open reed switches.

In one embodiment of the utility model, the first reed pipe and the second reed pipe are normally closed reed pipes.

Compared with the prior art, the utility model has the following beneficial effects:

1. the non-contact detection mode is used, the service life is long, and the repeated positioning accuracy is high.

2. The reed switch has good sealing performance, effectively prevents water from penetrating, greatly reduces the failure rate of the limit switch, and prolongs the service life of the limit switch.

3. Avoid appearing damaging and the phenomenon of position skew, guaranteed limit switch's accuracy, the location of being convenient for in addition limit switch installs and is fixed, has improved the practicality.

4. Compared with a common mechanical switch, the reed switch has the advantages of simple structure, small volume, high speed and long service life; compared with electronic switch, it has the features of high load impact resistance, etc. and high reliability.

Drawings

FIG. 1 is a schematic view of a pneumatic valve stop assembly of the present utility model;

FIG. 2 is a schematic diagram of a circuit for connecting a controller of a pneumatic valve limiting device with first and second normally open reed pipes;

In the figure: 1. a valve stem; 2. a hand wheel; 3. a valve rod seat; 4. a valve position indication rod; 5. a permanent magnet; 6. a pneumatic mechanism; 71. the first reed switch; 72. the second reed switch; 8. a diaphyseal stent; 81. a first sub-mount; 82. and a second sub-bracket.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1:

Referring to fig. 1 and 2, the present utility model provides a pneumatic valve limiting device, which includes a pneumatic mechanism 6, a limiting sensing mechanism, and a limiting adjusting mechanism.

The limit sensing mechanism comprises a first reed pipe 71, a second reed pipe 72, a controller and a bracket part; the contacts of the first reed pipe 71 and the second reed pipe 72 are connected with a controller, and the controller is a PLC (programmable logic controller) or a DCS (distributed control system); the first reed pipe 71 and the second reed pipe 72 are arranged on the bracket part.

The pneumatic mechanism 6 is connected with a controller, and the controller controls the starting and stopping of the pneumatic mechanism 6.

The support part comprises a backbone support 8, a first sub support 81 and a second sub support 82, wherein the front end of the first sub support 81 or the front end of the second sub support 82 are connected with the backbone support 8, the first sub support 81 is arranged above the second sub support 82, the first reed switch 71 is arranged at the rear end of the first sub support 81, and the second reed switch 72 is arranged at the rear end of the second sub support 82.

The upper end and the lower end of the backbone bracket 8 are connected with the shell.

The limit adjusting mechanism comprises a permanent magnet 5 and a valve position indicating rod 4, and an up-and-down moving mechanism, wherein the permanent magnet 54 is arranged at the front end of the valve position indicating rod 4, the rear end of the valve position indicating rod 4 is arranged on the up-and-down moving mechanism, and the up-and-down moving mechanism is arranged on a valve rod 1 of a pneumatic mechanism 6;

The up-down moving mechanism comprises a hand wheel 2 and a valve rod seat 3; the hand wheel 2 is arranged at the upper end of the valve rod 1, the valve rod seat 3 penetrates through the valve rod 1, the valve rod 1 is in threaded connection with the valve rod seat 3, and the rear end of the valve position indication rod 4 is arranged on the valve rod seat 3; the valve rod seat 3 is limited by using a shell, and the valve rod seat 3 can only move up and down in the shell.

The shell is fixedly connected with the pneumatic mechanism.

The permanent magnet 5 is located between the first reed pipe 71 and the second reed pipe 72.

The first reed pipe 71 and the second reed pipe 72 are normally open reed pipes;

It should be noted that, the housing is not shown in the drawings, and its function is only to fix or limit each part or component, and is a common function of the housing, and the specification is to specify the contact relationship with the contact component of the housing, which will be clear to those skilled in the art.

When the embodiment is used, the following steps are adopted:

S1, preparing, namely firstly adjusting the distance between a first reed pipe 71 and a second reed pipe 72 to the distance of the stroke of the pneumatic mechanism 6 plus the diameter influenced by a permanent magnet;

s2, debugging, wherein the controller controls the pneumatic mechanism to open the valve, the valve rod 1 moves upwards, when the permanent magnet 5 makes the first reed pipe 71 closed, the controller receives a signal, the pneumatic mechanism stops running, and if the valve is not completely opened at the moment, the permanent magnet 5 moves downwards through the hand wheel 2, so that the pneumatic mechanism is restarted until the valve is adjusted to a proper position;

And S3, closing, wherein the controller controls the pneumatic mechanism to close the valve, the valve rod 1 moves downwards, when the permanent magnet 5 closes the second reed pipe 71, the controller receives a signal, the pneumatic mechanism stops running, and if the debugging is correct, the valve is completely closed.

Example 2:

based on embodiment 1, the first reed pipe 71 and the second reed pipe 72 are normally closed reed pipes, and the control logic of the controller is adjusted.

When the embodiment is used, the following steps are adopted:

S1, preparing, namely firstly adjusting the distance between a first reed pipe 71 and a second reed pipe 72 to the distance of the stroke of a pneumatic mechanism 6 plus the diameter influenced by a permanent magnet 5;

S2, debugging, wherein the controller controls the pneumatic mechanism to open the valve, the valve rod 1 moves upwards, when the permanent magnet 5 enables the first reed pipe 71 to be opened, the controller receives a signal, the pneumatic mechanism stops running, and if the valve is not completely opened at the moment, the permanent magnet 5 moves downwards through the hand wheel 2, so that the pneumatic mechanism is restarted until the valve is adjusted to a proper position;

And S3, closing, wherein the controller controls the pneumatic mechanism to close the valve, the valve rod 1 moves downwards, when the permanent magnet 5 enables the second reed pipe 71 to be opened, the controller receives a signal, the pneumatic mechanism stops running, and if the debugging is correct, the valve is completely closed.

The parts themselves which are not discussed in the application and the connection modes of the parts in the application all belong to the known technology in the technical field. The preparation can be directly applied and is not repeated.

In the present utility model, the term "plurality" means two or more, unless explicitly defined 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; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer 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.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. The pneumatic valve limiting device comprises a pneumatic mechanism and a controller, wherein the pneumatic mechanism is connected with the controller,

The device also comprises a limit sensing mechanism and a limit adjusting mechanism;

The limit sensing mechanism comprises a first reed switch and a second reed switch; the contacts of the first reed switch or the second reed switch are connected with the controller;

The limit adjusting mechanism is arranged on the valve rod of the pneumatic mechanism and comprises a magnet, and the magnet is positioned between the first reed switch and the second reed switch.

2. A pneumatic valve spacing device as claimed in claim 1 wherein the spacing sensing mechanism further comprises a bracket portion;

The bracket part comprises a diaphyseal bracket, a first sub-bracket and a second sub-bracket;

The front end of the first sub-support or the second sub-support is connected with the backbone support, the first sub-support is arranged above the second sub-support, the first reed switch is arranged at the rear end of the first sub-support, and the second reed switch is arranged at the rear end of the second sub-support.

3. A pneumatic valve stop as claimed in claim 2, wherein the backbone bracket is connected at its upper end to the lower end and to the housing.

4. A pneumatic valve spacing device as claimed in claim 3 wherein said magnet is a permanent magnet and said spacing adjustment mechanism further comprises an up and down movement mechanism, a valve position indicator rod;

the permanent magnet is arranged at the front end of the valve position indicating rod, the rear end of the valve position indicating rod is arranged on the up-down moving mechanism, and the up-down moving mechanism is arranged on the valve rod of the pneumatic mechanism.

5. The pneumatic valve limit device of claim 4, wherein the up-and-down movement mechanism comprises a hand wheel and a valve rod seat;

The hand wheel is arranged at the upper end of the valve rod, the valve rod seat penetrates through the valve rod, the valve rod is in threaded connection with the valve rod seat, and the rear end of the valve position indication rod is arranged on the valve rod seat; the valve rod seat is limited by the shell, and can only move up and down in the shell.

6. A pneumatic valve stop as defined in claim 5, wherein the housing is fixedly connected to the pneumatic mechanism.

7. A pneumatic valve stop device according to any one of claims 1-6, wherein the controller is a PLC programmable controller or a DCS distributed control system; the controller controls the start and stop of the pneumatic mechanism.

8. A pneumatic valve stop device as claimed in any one of claims 1 to 6 wherein the first and second reed switches are normally open reed switches.

9. A pneumatic valve stop device as claimed in any one of claims 1 to 6 wherein the first and second reed switches are normally closed reed switches.