CN221424065U - A valve position feedback following device for regulating valve - Google Patents

Abstract

The utility model discloses a valve position feedback following device for a regulating valve, which at least comprises a follower rod, a moving part and a long slot plate; the moving part is provided with a U-shaped opening, one end of the follower rod is arranged through the U-shaped opening, and the other end of the follower rod is arranged through the slot portion of the long slot plate; the opening end of the U-shaped opening of the moving part is used to be connected with a valve stem; one end of the long slot plate away from the follower rod is used to be connected with a positioner; the opening of the regulating valve changes so that the valve stem moves up/down, and the follower rod is driven by the moving part to drive the long slot plate to move synchronously, thereby generating an angular displacement between the long slot plate and the positioner; the opening of the regulating valve is fed back by converting the angular displacement into an opening signal of the regulating valve.

Description

A valve position feedback following device for regulating valve

Technical Field

The utility model relates to the technical field of regulating valves, in particular to a valve position feedback following device for a regulating valve.

Background technique

Control valves are often used to adjust the flow of media in pipelines. According to the different valve control actuators, they can be divided into three categories: electric control valves, pneumatic control valves and self-actuated control valves. The main structure of the control valve consists of two parts: the valve body and the actuator. The valve body is in contact with the medium, and the flow of the medium in the pipeline is adjusted by adjusting the flow area between the valve core and the valve seat.

The valve actuator mainly includes a valve stem driver and a valve positioner. By comparing the difference between the input signal and the feedback signal value, the controller outputs a signal, the driver drives the valve stem to move, adjusts the valve stem displacement, and forms a closed-loop control system.

After the valve stem of the regulating valve moves into position, the position information of the valve stem needs to be fed back to the valve positioner, and the valve positioner then feeds back the opening information of the regulating valve to the control system.

Therefore, it is urgent to design a valve position feedback following device that can accurately feedback valve opening information.

Utility Model Content

In view of the above technical problems in the related art, the utility model provides a valve position feedback following device for a regulating valve, and the position information of the valve stem can be fed back to the valve positioner through the valve position feedback following device.

The utility model provides a valve position feedback following device for a regulating valve, which at least comprises a follower rod, a moving part and a long slot plate; the moving part is provided with a U-shaped opening, one end of the follower rod is arranged through the U-shaped opening, and the other end of the follower rod is arranged through the slot portion of the long slot plate; the opening end of the U-shaped opening of the moving part is used to be connected to the valve stem; the end of the long slot plate away from the follower rod is used to be connected to a positioner; the opening of the regulating valve changes to make the valve stem move up/down, and the follower rod is driven by the moving part to drive the long slot plate to move synchronously, thereby generating an angular displacement between the long slot plate and the positioner; the angular displacement is converted into an opening signal of the regulating valve to feedback the opening of the regulating valve.

In one embodiment, the follower rod is a threaded rod with a circular end cap at one end; the circular end cap is used to limit the movable part from escaping axially along the threaded rod; the threaded end of the threaded rod passes through the groove of the long groove plate and is screwed to a fastener, thereby limiting the long groove plate from escaping axially along the threaded rod through the fastener.

In one embodiment, the regulating valve position feedback device of the utility model also includes a limit member; the limit member is sleeved on the threaded rod, one end of which abuts against the long groove plate, and the other end cooperates with the circular end cap; the movable member is restricted in the gap between the limit member and the circular end cap.

In one embodiment, the limiting member includes a top sliding block and a spring which are sequentially sleeved on the threaded rod; after the top sliding block is sleeved on the threaded rod, it cooperates with the circular end cap to form an assembly gap, and the movable member is restricted in the assembly gap; the spring is compressed and arranged between the top sliding block and the long slot plate.

In one embodiment, one end of the top sliding block close to the spring is a flat surface, and the other end is a conical surface.

In one embodiment, the U-shaped opening of the moving member is smaller than the diameter of the circular end cap.

In one embodiment, the fastener is a fastening nut.

In one embodiment, the slot opening of the long slot plate is smaller than the outer diameter of the fastening nut.

In one embodiment, the moving member is a U-shaped fixing ring.

In one embodiment, the long groove plate is a strip plate with an elliptical groove in the center.

The valve position feedback following device of the regulating valve of the utility model embodiment has at least the following beneficial effects:

1. The valve position feedback follower device of the regulating valve of the embodiment of the utility model solves the problem that the follower rod is disengaged from the valve position moving member and thus causes an error in the feedback signal of the regulating valve, thereby improving the reliability of the valve position signal feedback device.

2. The valve position feedback following device of the regulating valve in the embodiment of the utility model can effectively prevent the follower rod of the regulating valve from falling out of the U-shaped groove of the moving part in a vibration environment by adding a limit device, thereby improving the reliability of the regulating valve.

Those skilled in the art will recognize additional features and advantages upon reading the detailed description and upon viewing the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is an overall structural diagram of a valve position feedback following device of a regulating valve according to an embodiment of the utility model.

FIG. 2 is a layout diagram of a valve position feedback following device of a regulating valve according to an embodiment of the present utility model.

Detailed ways

The technical solution of the utility model is further described below in conjunction with the accompanying drawings and through specific embodiments. Spatial relationship terms such as "below", "below", "under...", "low", "above", "on...", "high", etc. are used to facilitate the description to explain the positioning of an element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "an element is above/below another element" can mean that the two elements are in direct contact, or it can mean that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and should not be regarded as limitations. Similar terms represent similar elements throughout the description.

Referring to Fig. 1, the utility model provides a valve position feedback following device for a regulating valve, which at least includes a follower rod 1, a moving member 2 and a long slot plate 3. The moving member 2 is provided with a U-shaped opening, one end of the follower rod 1 is arranged through the U-shaped opening of the moving member 2, and the other end of the follower rod 1 is arranged through the slot portion of the long slot plate 3. Among them, the opening end 21 of the U-shaped opening of the moving member 2 is used to connect with the valve stem (the valve stem is not marked in the figure), and the moving member 2 can move synchronously with the valve stem. The end of the long slot plate 3 away from the follower rod 1 is used to connect with a positioner (the positioner is not marked in the figure), and the angle signal of the long slot plate 3 can be obtained through the positioner, and the angle signal is converted into an opening feedback signal of the regulating valve.

Specifically, when the valve positioner receives the input signal of the regulating valve opening, it adjusts the regulating valve cylinder pressure. After the cylinder pressure changes, it controls the valve stem of the regulating valve to move up/down, and the moving part moves up/down with the valve stem. At the same time, the follower rod drives the end of the long slot plate away from the positioner to move synchronously, thereby generating an angular displacement between the long slot plate and the positioner. The regulating valve position feedback following device of the utility model embodiment converts the angular displacement into the opening signal of the regulating valve to feedback the opening of the regulating valve.

It should be noted that the purpose of setting one end of the follower rod 1 through the U-shaped opening of the moving member 2 is to drive the follower rod 1 to move synchronously during the up/down movement of the moving member 2. Similarly, the other end of the follower rod 1 is fixedly set through the groove of the long groove plate 3, and the purpose is also to drive the end of the long groove plate away from the positioner to move synchronously when the follower rod 1 moves up/down under the drive of the moving member 2.

In one embodiment, the follower rod 1 is a threaded rod with a circular end cap 11 at one end. The circular end cap 11 is used to limit the moving member 2 from coming out along one side of the axial direction of the threaded rod. The threaded end 12 of the threaded rod passes through the groove of the long groove plate 3 and is screwed to the fastener 4, and the long groove plate is limited from coming out along the other side of the axial direction of the threaded rod through the fastener 4.

In the above embodiment, the U-shaped opening of the moving member 2 is smaller than the diameter of the circular end cap 11 .

The valve position feedback follower device of the regulating valve of the embodiment of the utility model can be applied to a vibration environment and prevent the follower rod from coming out of the moving part when the vibration energy of the regulating valve is relatively large.

In one embodiment, in order to prevent the movable member from sliding along the axial direction of the follower rod during the vibration of the regulating valve, the regulating valve position feedback follower device of the utility model embodiment is provided with a stopper 5 on the periphery of the threaded end 12. The stopper 5 is sleeved on the threaded rod, one end of which abuts against the long slot plate 3, and the other end of which cooperates with the circular end cap 11 to form a gap. The movable member 2 is restricted in the gap between the stopper 5 and the circular end cap 11.

In the valve position feedback following device of the regulating valve of the embodiment of the utility model, the circular end cap 11 of the threaded rod is fixed to one side of the U-shaped groove of the moving part 2, and there is an assembly gap between the circular end cap 11 and the moving part 2. In order to prevent the moving part 2 from moving relative to the circular end cap 11 in a vibration environment, a limiter is used to press on the other side of the U-shaped groove of the moving part 2.

The limiting member 5 is elastic, and under the elastic force of the limiting member 5 , the moving member 2 is pressed against the inner side of the circular end cap 11 .

In the above embodiment, the limiting member 5 includes a top sliding block 51 and a spring 52 which are sequentially sleeved on the threaded end 12 of the threaded rod. After the top sliding block 51 is sleeved on the threaded end 12 of the threaded rod, it cooperates with the circular end cap 11 to form an assembly gap, and the moving member 2 is restricted in the assembly gap. The spring 52 is compressed and arranged between the top sliding block 51 and the long slot plate 3. After the long slot plate 3 and the fastener 4 are installed in place, under the elastic force of the spring 52, the long slot plate 3 is pressed against the surface of the fastener 4, and the top sliding block 51 presses the U-shaped slot assembly of the moving member 2 against the circular end cap 11.

Among them, one end of the top sliding block 51 axially close to the spring 52 is a plane, and the other end is a cone surface. A center hole for passing the threaded end 12 of the threaded rod is also provided at the axial center position. One side of the cone surface is assembled with the U-shaped groove of the moving part 2, and one side of the plane is pressed with the end face of the spring 52. One end of the spring 52 away from the top sliding block 51 is attached to the long groove plate 6. Under the elastic force of the spring 52, the top sliding block 51 is assembled and pressed with the U-shaped groove of the moving part 2.

In any of the above embodiments, the fastener 4 is a fastening nut.

Furthermore, in order to prevent the groove portion of the long slot plate 3 from coming out of the fastening nut 4 , the opening of the groove of the long slot plate 3 may be made smaller than the outer diameter of the fastening nut 4 .

In one embodiment, the moving member 2 is a U-shaped fixing ring, and the open end of the U-shaped fixing ring is connected to the valve stem (not shown in the figure).

In one embodiment, the long groove plate 3 is a strip plate with an elliptical groove at the center, and one end of the strip plate away from the threaded rod is used for connection with a positioner (not shown in the figure).

The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The valve position feedback following device of the regulating valve is characterized by at least comprising a follow-up rod, a moving piece and a long groove plate; the movable piece is provided with a U-shaped opening, one end of the follow-up rod passes through the U-shaped opening, and the other end of the follow-up rod passes through the groove part of the long groove plate;

The opening end of the U-shaped opening of the moving piece is used for being connected with the valve rod; one end of the long groove plate, which is far away from the follow-up rod, is used for being connected with a positioner;

The opening of the regulating valve is changed to enable the valve rod to move up/down, the follower rod is driven by the moving piece to drive the long groove plate to move synchronously, and then angular displacement is generated between the long groove plate and the positioner; the opening degree of the regulating valve is fed back by converting the angular displacement into an opening degree signal of the regulating valve.

2. The regulator valve position feedback follower of claim 1, wherein the follower rod is a threaded rod having a circular end cap at one end; the circular end cap is used for limiting the moving piece from axially falling out along the threaded rod; the threaded end of the threaded rod passes through the groove part of the long groove plate and then is in threaded connection with a fastener, and the long groove plate is limited to axially deviate from along the threaded rod through the fastener.

3. The regulator valve position feedback follower of claim 2, further comprising a stop; the limiting piece is sleeved on the threaded rod, one end of the limiting piece is abutted with the long groove plate, and the other end of the limiting piece is matched with the round end cap; the moving member is constrained within a gap between the limiting member and the circular end cap.

4. The adjusting valve position feedback follower of claim 3, wherein the limiting member comprises a top slider and a spring which are sequentially sleeved on the threaded rod; the top end sliding block is sleeved on the threaded rod and then matched with the round end cap to form an assembly gap, and the moving piece is limited in the assembly gap; the spring is compressively disposed between the top slider and the elongated slot plate.

5. The regulator valve position feedback follower of claim 4, wherein one end of the top slider adjacent to the spring is planar and the other end is tapered.

6. A regulator valve position feedback follower as defined in any one of claims 2-5, wherein the U-shaped opening of the moveable member is smaller than the diameter of the circular end cap.

7. The regulator valve position feedback follower of claim 6, wherein the fastener is a fastening nut.

8. The regulator valve position feedback follower of claim 7, wherein the slot opening of the slotted plate is less than the outer diameter of the fastening nut.

9. The regulator valve position feedback follower of claim 1, wherein the moveable member is a U-shaped stationary ring.

10. The regulator valve position feedback follower of claim 1, wherein the elongated slotted plate is a slotted plate having an oblong slot in the center thereof.