Pressure reduction structure for valve intelligent positioner I / P unit

Abstract

The utility model relates to a pressure reduction structure for an I / P unit of an intelligent positioner of a valve, the pressure reduction structure is arranged on a driving gas path of the positioner in series, and the pressure reduction structure comprises a pressure reduction seat, a pressure reduction base, a valve cover, a pressure reduction supporting seat, a diaphragm, a diaphragm tray and a valve core; the valve seat is fixed to the left end of the valve element, a sealing piece is arranged on the right side end face of the valve seat, the valve seat is located in the first circulation hole, and an abutting elastic piece is arranged between the left end of the valve seat and the first circulation hole. The pressure of the air source is output after pressure reduction and filtration, a stable and clean back pressure air source is provided for the locator I / P unit, and the control performance of the intelligent locator is effectively improved.

Description

Technical Field

[0001] This utility model relates to a valve intelligent positioner, and in particular to a pressure reduction structure for the I / P unit of a valve intelligent positioner. Background Technology

[0002] Valve intelligent positioners are one of the main supporting products for control valves. As described in patent CN217927394U, the positioner receives signals from the DCS control system and automatically controls the air pressure entering the working chamber of the pneumatic actuator to drive the valve to produce displacement. Simultaneously, it compares the displacement with the control signal and continuously corrects it to ensure the control valve reaches the signal-set opening degree. The I / P unit is a crucial component of the valve positioner, converting the control electrical signal into a pneumatic signal. However, traditional I / P conversion units directly connect to the air source pressure, but the air source pressure at the valve application site is unstable, frequently fluctuating and containing small iron filings, severely affecting the normal operation of the I / P unit, thus impacting the control mode of the valve intelligent positioner and increasing the failure rate.

[0003] In summary, how to provide a stable back pressure air source for the I / P unit, improve the control performance of the valve intelligent positioner, and reduce the failure rate has become an urgent problem for researchers in this field. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: how to provide a stable back pressure gas source for the I / P unit;

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model relates to a pressure-reducing structure for an I / P unit of a valve intelligent positioner. This pressure-reducing structure is connected in series in the positioner's drive air circuit. The pressure-reducing structure includes: a pressure-reducing seat, with a valve cavity extending to the right from its left end; an air inlet on the pressure-reducing seat, one end of which communicates with the valve cavity and the other end with the drive air circuit; an annular cavity and an air outlet on the left end face of the pressure-reducing seat, one end of which communicates with the annular cavity and the other end with the drive air circuit; a pressure-reducing base, disposed within the valve cavity, with a first flow hole extending axially through it; a valve cover, covering the left side of the pressure-reducing seat, forming a component cavity between the valve cover and the pressure-reducing seat; and a pressure-reducing support, fixed between the valve cover and the pressure-reducing base, and connected to the pressure-reducing... The left end face of the seat is sealed and connected, and a through hole is axially opened in the middle of the seat; a plurality of second flow holes are provided on the right side of the annular cavity and spaced apart on the pressure reducing support seat; a diaphragm is disposed between the valve cover and the pressure reducing base, and is located on the right side of the pressure reducing support seat, forming a first pressure reducing gap between it and the pressure reducing support seat; a diaphragm tray is disposed in the component cavity, and the right side of the diaphragm abuts against the diaphragm tray; a valve core is axially fixed in the middle of the diaphragm, passes through the through hole, and forms a second pressure reducing gap between it and the through hole; a valve seat is fixed to the left end of the valve core, and a sealing element is provided on the right end face of the valve seat, the valve seat is located in the first flow hole, and an elastic element abuts between the left end of the valve seat and the first flow hole.

[0007] Furthermore, a deformation pressure plate is disposed on the right side of the diaphragm tray and located inside the component cavity, and the deformation pressure plate abuts against the diaphragm tray; an adjusting screw is threadedly connected to the valve cover, and rotating the adjusting screw to the left causes the left end of the adjusting screw to abut against the center of the deformation pressure plate, so that the middle part of the deformation pressure plate deforms to the left.

[0008] Furthermore, the outer peripheral wall of the deformation pressure plate is provided with multiple notches that are easy to deform.

[0009] Furthermore, a filter element is provided at the opening of the annular cavity.

[0010] Furthermore, the pressure-reducing support includes: a first connecting ring disposed between the valve cover and the pressure-reducing base; an inclined ring whose outer wall is connected to the inner wall of the first connecting ring and is inclined to the left; a second connecting ring disposed to the right of the inclined ring and connected to the inclined ring by a transition ring, the right end face of the second connecting ring being located to the left of the right end face of the first connecting ring, and the second connecting ring forming the first pressure-reducing gap with the diaphragm; and a contact ring having the through hole in its middle, connected to the inner ring of the second connecting ring, located to the left of the second connecting ring, and its left end face being adapted to contact the sealing element to cut off the gas source.

[0011] The beneficial effects of this utility model are as follows: This utility model is a pressure reducing structure for the I / P unit of a valve intelligent positioner. The pressure reducing structure is installed inside the drive air circuit of the valve intelligent positioner. After reducing and filtering the air source pressure, the output pressure provides a stable and clean back pressure air source for the positioner I / P unit, which effectively improves the control performance of the intelligent positioner. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a cross-sectional view of this embodiment;

[0014] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0015] Figure 3 This is a schematic diagram of the deformation pressure plate.

[0016] Figure 4 This is a schematic diagram of the pressure relief support. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] In this embodiment, the drive air circuit is connected in series as described in publication number CN217927394U. (See also...) Figure 1 , 2 , Figure 1 This is a cross-sectional view of this embodiment. The left side of the figure is the pressure reducing seat 1, and the right side is the valve cover 2. The valve cover 2 is placed on the left side of the pressure reducing seat 1, and the two form a component cavity 21. The bottom of the pressure reducing seat 1 has an air inlet 11 and an air outlet 12. The right side of the pressure reducing seat 1 has a valve cavity 13 that extends to the left. The top end of the air inlet 11 is connected to the valve cavity 13. The right end face of the pressure reducing seat 1 has an annular cavity 14, and the top of the air outlet 12 is connected to the annular cavity 14.

[0019] A pressure-reducing base 3 is provided inside the valve cavity 13, and a first flow hole 31 is provided through the pressure-reducing base 3 axially upward; the valve seat 4 is located inside the first flow hole 31 and is connected to the pressure-reducing base 3 by an elastic element 41.

[0020] The component cavity 21 is provided with a pressure reducing support 5. The pressure reducing support 5 is an irregularly shaped part. Its outer periphery is fixed between the pressure reducing seat 1 and the valve cover 2. The pressure reducing support 5 will not deform. The center of the pressure reducing support 5 is provided with an axial through hole 51. Multiple second flow holes 52 are provided on the pressure reducing support 5. The second flow holes 52 are located on the right side of the annular cavity 14.

[0021] A diaphragm 6 is fixed to the right side of the pressure-reducing support 5. The outer periphery of the diaphragm 6 is also fixed between the pressure-reducing seat 1 and the valve cover 2. A valve core 7 is provided on the left side of the middle part of the diaphragm 6. The valve core 7 passes through the through hole 51 and is connected to the valve seat 4. The outer diameter of the valve core 7 is smaller than the inner diameter of the through hole 51, and a second pressure-reducing gap 71 is formed between the two. A first pressure-reducing gap 61 is formed between the left side of the diaphragm 6 and the pressure-reducing support 5. The diaphragm 6 will deform and bend under force.

[0022] A diaphragm tray 8 is provided on the right side of the diaphragm 6. The left side of the diaphragm tray 8 abuts against the right side of the diaphragm 6, which supports the diaphragm 6 and prevents the diaphragm 6 from undergoing excessive bending deformation. The diaphragm tray 8 deforms and bends synchronously with the diaphragm 6.

[0023] Gas at a suitable pressure enters the valve chamber 13 through the inlet 11, passes through the first flow hole 31, the second pressure reduction gap 71, the first pressure reduction gap 61, the second flow hole 52, and the annular cavity 14 of the pressure reducing base 3, and is discharged from the outlet 12. Specifically, the gas source pressure is generally 0.35MPa to 0.5MPa, which is reduced to 0.1MPa pressure to provide a stable back pressure gas source for the positioner I / P unit.

[0024] The force exerted by the gas pressure on the right end face of valve seat 4 is denoted as F3, and the force exerted by the elastic element 41 on valve seat 4 is denoted as F1. The directions of F3 and F1 are to the right; the diaphragm tray 8 acts to the left on the diaphragm 6, so the force exerted to the left on valve seat 4 is denoted as F2.

[0025] When the gas pressure is too low, F3+F1 is much less than F2. At this time, the valve seat 4 abuts against the pressure reducing base 3, the first flow hole 31 is closed, and the gas cannot pass through the first flow hole 31. Therefore, the gas cannot be discharged from the gas outlet 12.

[0026] When the gas pressure is too high, F3+F1 is much greater than F2. At this time, the valve seat 4 is forced to move to the right until the seal 42 contacts the pressure reducing support 5. The seal 42 seals the second pressure reducing gap 71. At this time, the gas cannot pass through the second pressure reducing gap 71, so the gas cannot be discharged from the outlet 12.

[0027] In order to prevent the iron filings impurities in the depressurized gas from clogging the drive gas path, a filter element 15 is provided at the opening of the annular cavity 14 in this embodiment. The filter element 15 is located on the right side of the annular cavity 14. When the depressurized gas enters the annular cavity 14, it needs to pass through the filter element 15. The filter element 15 filters the impurities in the gas to ensure that a clean and stable gas source enters the drive gas path.

[0028] To achieve adjustable support force of the diaphragm tray on the diaphragm, this embodiment employs a deformation pressure plate 9 located on the right side of the diaphragm tray 8 and within the component cavity 21, which abuts against the diaphragm tray 8; an adjusting screw 10 is threadedly connected to the valve cover 2, and rotating the adjusting screw 10 to the left causes the left end of the adjusting screw 10 to abut against the center of the deformation pressure plate 9, resulting in deformation of the middle of the deformation pressure plate 9 to the left;

[0029] In this embodiment, the left side of the deformation pressure plate 9 acts on the outer ring of the diaphragm tray 8, and the right center of the deformation pressure plate 9 is abutted by the adjusting screw 10. By rotating the adjusting screw 10 to the left, the center of the deformation pressure plate 9 bends to the left, increasing the force exerted by the deformation pressure plate 9 on the diaphragm tray 8. Thus, the valve seat 3, valve core 7, and diaphragm 6 require greater force to bend the diaphragm tray 5. Therefore, the pressure-reducing structure in this embodiment can achieve the passage of a higher pressure air source. In summary, by adjusting the left and right displacement of the adjusting screw 10, the range of air pressure that can pass through the pressure-reducing structure can be adjusted.

[0030] See Figure 3 To illustrate the specific structure of the deformation pressure plate, this embodiment uses multiple easily deformable notches 91 on the outer peripheral wall of the deformation pressure plate 9;

[0031] By setting a notch 91, the middle part of the deformation pressure plate 9 undergoes axial deformation and bending under the action of the adjusting screw 10.

[0032] See Figure 4 To illustrate the specific structure of the pressure-reducing support 5, the pressure-reducing support 5 includes: a first connecting ring 53, which is disposed between the valve cover 2 and the pressure-reducing base 1; an inclined ring 54, whose outer wall is connected to the inner wall of the first connecting ring 53, and which is inclined to the left; a second connecting ring 55, which is disposed to the right of the inclined ring 54, and is connected to the inclined ring 54 by a transition ring 56, the right end face of the second connecting ring 55 is located to the left of the right end face of the first connecting ring 53, and the second connecting ring 55 and the diaphragm 5 form the first pressure-reducing gap 61; and a contact ring 57, in which the through hole 51 is opened in the middle, which is connected to the inner ring of the second connecting ring 55, and is located to the left of the second connecting ring 55, the left end face of which is adapted to contact the sealing element 42 to cut off the gas source;

[0033] The pressure-reducing support 5 is configured from the inside out as follows: through hole 51, contact ring 57, second connecting ring 55, transition ring 56, inclined ring 54, and first connecting ring 53. The first connecting ring 53 is pressed onto the valve cover 2 and the pressure-reducing base 1. The inclined ring 54 is set to provide a flow gap between the diaphragm 5 and the annular cavity 14. The second connecting ring 55 is set to form a first pressure-reducing gap 61 between the pressure-reducing support 5 and the diaphragm 6. The left side of the contact ring 57 is sealed to the right side of the seal 42, thereby achieving the purpose of cutting off the airflow.

[0034] In addition, it should be noted that the pressure relief support 5 and the pressure relief seat 1 are connected by two sealing rings, which prevents gas from escaping.

[0035] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pressure reducing structure for a valve intelligent positioner I / P unit, which is provided in series in a driving air path of the positioner, characterized by, The pressure-reducing structure includes: The pressure reducing seat has a valve chamber extending to the right from its left end. The pressure reducing seat has an air inlet, one end of which is connected to the valve chamber and the other end is connected to the drive air circuit. The left end face of the pressure reducing seat has an annular cavity and an air outlet, one end of which is connected to the annular cavity and the other end is connected to the drive air circuit. A pressure-reducing base is disposed inside the valve cavity and has a first flow hole extending through it axially. A valve cover is provided on the left side of the pressure reducing seat, and a component cavity is formed between the valve cover and the pressure reducing seat; A pressure-reducing support is fixed between the valve cover and the pressure-reducing base and is sealed to the left end face of the pressure-reducing base. A through hole is axially opened in the middle of the support. A plurality of second flow holes are spaced apart on the right side of the annular cavity. A diaphragm is disposed between the valve cover and the pressure reducing base, and is located on the right side of the pressure reducing support, forming a first pressure reducing gap between the diaphragm and the pressure reducing support. A diaphragm tray is disposed within the cavity of the component, and the right side of the diaphragm abuts against the diaphragm tray; A valve core, which is axially fixed in the middle of the diaphragm, passes through the through hole and forms a second pressure reduction gap with the through hole; A valve seat is fixed to the left end of the valve core. A sealing element is provided on the right end face of the valve seat. The valve seat is located in the first flow hole. An abutting elastic element is provided between the left end of the valve seat and the first flow hole.

2. The pressure reducing structure for a valve intelligent positioner I / P unit according to claim 1, wherein A deformation pressure plate is disposed on the right side of the diaphragm tray and located inside the cavity of the component, and the deformation pressure plate abuts against the diaphragm tray; The adjusting screw is connected to the valve cover by a thread. Rotating the adjusting screw to the left causes the left end of the adjusting screw to abut against the center of the deformation pressure plate, causing the center of the deformation pressure plate to deform to the left.

3. The pressure reducing structure for an I / P unit of a valve intelligent positioner according to claim 2, wherein The outer peripheral wall of the deformation pressure plate has multiple notches that facilitate deformation.

4. The pressure reducing structure for an I / P unit of a valve intelligent positioner according to claim 1, wherein A filter element is provided at the opening of the annular cavity.

5. The pressure reducing structure for an I / P unit of a valve intelligent positioner according to claim 1, wherein The pressure relief support includes: The first connecting ring is disposed between the valve cover and the pressure reducing base; An inclined ring, the outer wall of which is connected to the inner wall of the first connecting ring, is inclined to the left; The second connecting ring is disposed on the right side of the inclined ring and is connected to the inclined ring by a transition ring. The right end face of the second connecting ring is located to the left of the right end face of the first connecting ring, and the first pressure reduction gap is formed between the second connecting ring and the diaphragm. The contact ring has a through hole in its middle, which is connected to the inner ring of the second connecting ring. It is located on the left side of the second connecting ring, and its left end face is adapted to contact the sealing element to cut off the air source.

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