Self-operated sealing intelligent control valve

Abstract

The invention discloses a self-operated sealing intelligent control valve which comprises a valve body, a fixing seat body is welded to the valve body, a sealing seat is connected to the fixing seat body in a clamped mode, a sealing disc is arranged on one side of the sealing seat, expansion blocks are connected to the sealing disc in a clamped mode, a wedge-shaped block is arranged between the two expansion blocks, a valve rod is connected to the upper portion of the wedge-shaped block, and the valve rod is connected to the lower portion of the wedge-shaped block. The valve body is provided with a stroke sensor a, a stroke sensor b and a stroke sensor c which are located above the valve rod. The backpressure self-tightening fire-proof valve has the advantages that the sealing performance is improved through backpressure self-tightening, soft and hard sealing and fire-proof functions are achieved, the opening torque is low, and an intelligent control system is arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gate valves, in particular to a self-sealing intelligent control valve. BACKGROUND

[0002] The gate valve on the market at present is mainly composed of a valve body, a valve cover, a gate plate, a valve rod and a valve seat, all of which are fixed valve seats welded on the valve body, and the valve rod is driven by an actuator to make the sealing disc close to the valve seat to achieve initial sealing, and the outlet sealing is achieved after the medium arrives.

[0003] The conventional gate valve has the following defects:

[0004] 1. Inlet sealing cannot be guaranteed: the fixed valve seat structure cannot provide auxiliary sealing force when the sealing disc is impacted by high pressure or medium, making it difficult to achieve inlet sealing;

[0005] 2. Difficulty in repairing internal parts: when the valve seat sealing surface is damaged, the valve seat cannot be replaced online because it is welded and fixed to the valve body, and must be cut off after being taken offline and re-welded;

[0006] 3. Insufficient sealing performance: hard sealing is commonly used, and it is basically impossible to achieve true zero leakage;

[0007] 4. Large opening resistance: the pressure cannot be released at the first time when opening, and the entire medium pressure needs to be overcome, resulting in high cost of the actuator. SUMMARY

[0008] The present application aims to provide a self-sealing intelligent control valve to solve the problems raised in the background art, which has the advantages of improving sealing performance by back pressure self-tightening, combining soft and hard sealing and fireproof function, low opening torque, and equipped with an intelligent control system.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a self-sealing intelligent control valve, comprising a valve body, the valve body is welded with a fixed seat body, the fixed seat body is clamped with a sealing seat, one side of the sealing seat is provided with a sealing disc, the sealing disc is clamped with a bulge, a wedge-shaped block is arranged between the two bulges, the valve rod is connected above the wedge-shaped block, the valve body is provided with a travel sensor a, a travel sensor b and a travel sensor c above the valve rod.

[0010] Preferably, the sealing seat is detachably installed on the fixed seat body by four circumferentially distributed claw-shaped buckles.

[0011] Preferably, a pre-tightening spring or O-ring is arranged between the fixed seat body and the sealing seat.

[0012] Preferably, the sealing surface of the sealing seat is surfacing STL, the sealing seat and the seat ring hole of the valve body are clearance fit, two annular grooves are arranged on the outer circle, a fluorine rubber O-shaped ring is arranged in the first groove to provide sealing function, and a graphite fireproof sealing ring is arranged in the second groove to expand to form secondary sealing in case of fire.

[0013] Another object of the present application is to provide a self-sealing intelligent control valve pneumatic control system, comprising a pneumatic actuator, a stroke sensor a, a stroke sensor b, a stroke sensor c, a balance valve, a solenoid valve a, a filter pressure reducing valve, a pneumatic control valve a, a pneumatic control valve b, a manual valve, a check valve, a solenoid valve b, a solenoid valve c, a throttling speed regulating valve and a gas tank.

[0014] Preferably, the gas tank is connected with the check valve, the check valve is connected with the filter pressure reducing valve, the filter pressure reducing valve is connected with the pneumatic control valve a, the pneumatic control valve a is connected with the pneumatic control valve b, the pneumatic control valve b is connected with the pneumatic actuator, the pneumatic actuator is connected with the valve body, and the stroke sensor a, the stroke sensor b and the stroke sensor c are arranged on the starting actuator.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. Back pressure self-tightening mechanism: the medium pressure drives the sealing seat to move towards the sealing disc, the greater the pipeline pressure, the greater the back pressure of the sealing seat, and the sealing specific pressure is automatically enhanced with the pressure;

[0017] 2. On-line replacement of sealing elements: when the sealing surface is damaged or needs to be replaced after long-term use, the soft sealing on the sealing seat and the sealing disc or the entire sealing side can be replaced, so that the sealing elements can be completely replaced without taking the valve off line;

[0018] 3. The lower end of the valve stem adopts a conical surface design, which forms a rolling pair with the inner and outer seats on the sealing disc. The seat integrates a high-precision rolling bearing, and the driving force is transmitted through the rolling contact of the conical surface-bearings, achieving low friction coefficient and sensitive response;

[0019] 4. Pressure relief action: when opening, the valve stem conical surface drives the bearing and the seat to move, the sealing disc forms a lever system with the lowest point of its sealing surface in contact as the fulcrum, so that the sealing disc rotates at the fulcrum, and the sealing surface on it can instantaneously separate from the sealing surface of the sealing seat, the sealing cavity pressure is discharged before the valve is lifted, effectively reducing the opening torque by more than 50%;

[0020] 5. Multi-electrical element cooperative automatic control: PLC controller, battery valve, pressure sensor, position sensor are configured, the pressure relief rate and the gas tank switching condition logical judgment are realized through PLC programming, and manual / automatic mode switching is supported;

[0021] 6. Precise control of pressure relief process speed: The throttling control valve is used to control the speed of the valve during the pressure relief process, avoiding the pipe vibration, water hammer effect and equipment impact damage caused by sudden pressure drop in traditional valve pressure relief;

[0022] 7. Wind path fault safety protection mechanism: The gas tank capacity is designed to be 1.5-2 times the rated gas consumption of the system, and is installed in parallel with the main wind path. The built-in pressure sensor monitors the main wind path pressure in real time. When the main wind path pressure is detected to be lower than the set threshold, the electromagnetic valve automatically switches to the gas supply of the gas tank to open and close the valve;

[0023] 8. Improved sealing performance: Soft and hard sealing (STL+PTFE) adapts to complex media, and the sealing surface life is extended; The back pressure self-tightening design makes the sealing specific pressure proportional to the medium pressure, realizing "the tighter the pressure, the tighter the seal", achieving the effect of imported sealing;

[0024] 9. High safety: O-ring or spring + fireproof sealing ring meets API 607 fireproof standard;

[0025] 10. Low operating cost: The rolling pressure relief structure has been relieved before the relative motion of the sealing surface, greatly reducing the specification requirement of the actuator;

[0026] 11. High service life: The sealing surfaces are always operated under low differential pressure conditions, and the sealing surfaces are separated during the pressure relief process, so the possibility of sealing damage is very low;

[0027] 12. Convenient maintenance: The sealing elements on the valve can be replaced online, which increases the convenience of maintenance;

[0028] 13. Intelligent automation: Through the double protection mechanism of throttling speed regulation + gas tank redundancy, the "rigid action" and "fault out of control" pain points in traditional pressure relief control are solved, realizing the balance of flexible pressure relief process and zero risk in fault state. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of an embodiment;

[0030] Figure 2 is Figure 1 is a local enlarged view of area A in the embodiment;

[0031] Figure 3 is a sectional view of part of the structure of the embodiment;

[0032] Figure 4 is a schematic diagram of the pneumatic control system when the gate is closed in the embodiment;

[0033] Figure 5 is a schematic diagram of the pneumatic control system in the first stage of opening the gate in the embodiment;

[0034] Figure 6 This is a schematic diagram of the pneumatic control system for the second stage of gate opening in the embodiment;

[0035] Figure 7 This is a schematic diagram of the structure of the fixing base body in the embodiment;

[0036] Figure 8 This is a schematic diagram of the sealing seat in the embodiment;

[0037] Figure 9 This is a schematic diagram of the external fixing base;

[0038] Figure 10 This is a schematic diagram of the internal fixing seat.

[0039] Figure 11 This describes the internal structure of a pneumatic actuator.

[0040] Figure 12 This is a schematic diagram of the connection structure of a multi-layer cable.

[0041] In the diagram: 1. Valve body; 2. Fireproof sealing ring; 3. O-ring; 4. Fixed seat body; 5. Sealing seat; 6. Sealing disc; 7. Expansion block; 8. Wedge block; 10. Bushing; 11. Inner fixed seat; 12. Bearing; 13. Pin; 14. Outer fixed seat; 15. Valve stem; 16. Stroke sensor c; 17. Stroke sensor b; 18. Stroke sensor a; 19. Pneumatic actuator; 20. Air tank; 21. Balance valve; 22. Solenoid valve a; 23. Filter pressure reducing valve; 24. Pneumatic control valve a; 25. Pneumatic control valve b; 26. Manual valve; 27. Check valve; 28. Solenoid valve b; 29. ​​Solenoid valve c; 30. Throttling speed control valve; 31. Explosion-proof junction box. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In this embodiment of the invention,

[0044] A self-operated sealing intelligent control valve, such as Figures 1-12 As shown, the valve body includes a valve body 1, a fixed seat body 4 welded to the valve body 1, a sealing seat 5 snapped onto the fixed seat body 4, a sealing disc 6 provided on one side of the sealing seat 5, an expansion block 7 snapped onto the sealing disc 6, a wedge block 8 provided between the two expansion blocks 7, a valve stem 15 connected above the wedge block 8, and a stroke sensor a18, a stroke sensor b17 and a stroke sensor c16 located above the valve stem 15 in the valve body 1.

[0045] The sealing seat 5 is detachably installed on the fixed seat body 4 by four circumferentially distributed claw-shaped buckles.

[0046] A pre-tightening spring or O-ring 3 is arranged between the fixed seat body 4 and the sealing seat 5.

[0047] The sealing surface of the sealing seat 5 is surfacing welded STL, the sealing seat 5 and the seat ring hole of the valve body 1 are in clearance fit, two annular grooves are arranged on the outer circle, the first groove is provided with a fluorine rubber O-ring to provide sealing function, and the second groove is provided with a graphite fireproof sealing ring 2 to expand to form secondary sealing in case of fire.

[0048] A pneumatic control system of a self-sealing intelligent control valve, comprising a pneumatic actuator 19, a stroke sensor a 18, a stroke sensor b 17, a stroke sensor c 16, a balance valve 21, an electromagnetic valve a 22, a filter pressure reducing valve 23, a gas control valve a 24, a gas control valve b 25, a manual valve 26, a check valve 27, an electromagnetic valve b 28, an electromagnetic valve c 29, a throttling speed regulating valve 30 and a gas storage tank 20.

[0049] The gas storage tank is connected with the check valve 27, the check valve 27 is connected with the filter pressure reducing valve 23, the filter pressure reducing valve 23 is connected with the gas control valve a 24, the gas control valve a 24 is connected with the gas control valve b 25, the gas control valve b 25 is connected with the pneumatic actuator 19, the pneumatic actuator 19 is connected with the valve body 1, and the stroke sensor a 18, the stroke sensor b 17 and the stroke sensor c 16 are arranged on the pneumatic actuator 19.

[0050] The valve body 1 is further provided with an inner fixed seat 11 and an outer fixed seat 14, the outer fixed seat 14 is provided with a pin shaft 13, the pin shaft 13 is provided with a bearing 12, and the bearing 12 is provided with a shaft sleeve 10.

[0051] The pneumatic actuator 19 is provided with a plurality of layers of cables, the plurality of layers of cables are divided into twelve, five of which are connected with electromagnetic valves, and the remaining six are connected with stroke sensors; the plurality of layers of cables are divided into 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11# and 12#; 1#, 3# and 5# are connected with electromagnetic valve positive stages, 2# and 4# are connected with electromagnetic valve negative stages; 7#, 9# and 11# are connected with valve stroke sensor signal lines; 8#, 10# and 12# are connected with development stroke sensor signal lines.

[0052] The electromagnetic valve and stroke sensor cable are connected into the explosion-proof junction box 31 through the explosion-proof property pipe, the wires are led in from the side, the wires are led out from below, an electrical interface is reserved, and a clamping gland joint is provided.

[0053] Working principle:

[0054] Stroke sensor b17 and stroke sensor c16 are installed on the lower cover of the cylinder, and stroke sensor a18 is installed on the upper cover of the cylinder to control the opening and closing speed of the valve.

[0055] Full opening to full closing: the 12 end of electromagnetic valve a22 is powered, the control air pushes the pneumatic valve a24 to the left through the electromagnetic valve a22, the two pneumatic valves b25 are pushed to the spring end by the control air, and the electromagnetic valve b28 is in a power-off state. At this time, the main air source sequentially passes through the filter pressure reducing valve 23, the pneumatic valve a24, the one-way valve 27, the pneumatic valve b25 into the cylinder to drive the valve rod 15 to descend quickly. The valve rod 15 drives the wedge block 8, the sealing disc 6, the expansion block 7, etc. to descend together, and when the sealing disc 6 contacts the bottom of the valve body 1, the wedge block 8 is pressed against the expansion block 7 to generate two horizontal forces, which press the left and right sealing discs 6 against the sealing seat 5. At this time, the O-ring 3 or spring on the back of the sealing seat 5 generates a spring force, so that the sealing seat 5 also adheres to the sealing disc 6, forming a seal. When the pipeline pressure comes, the sealing seat 5 generates back pressure to push the sealing disc 6, and the sealing specific pressure automatically increases with the increase of pressure, achieving more reliable sealing effect.

[0056] Full closing to full opening: at this time, the valve is in a fully closed state, the 14 end of electromagnetic valve a22 is powered, the control air pushes the pneumatic valve a24 to the right through the electromagnetic valve a22, the main air source sequentially passes through the filter pressure reducing valve 23, the pneumatic valve a24, the pneumatic valve b25 into the cylinder to drive the valve rod 15 to ascend, the electromagnetic valve b28 is in a power-off state, and the cylinder slowly exhausts through the throttling speed regulating valve 30. At this time, the valve rod 15 slowly rises, drives the high-precision rolling bearing 12 through the lower conical surface, and pushes the base installed on the sealing disc 6 to the center. The sealing disc rotates around the lowest point of the sealing surface as the fulcrum, and the sealing surface on it instantaneously separates from the sealing surface of the sealing seat 5, realizing pressure relief before opening. When the valve continues to rise, the stroke sensor b17 obtains a signal, and the valve pressure relief process is basically completed. The electromagnetic valve b28 is powered, the cylinder is quickly exhausted through the electromagnetic valve b28, and the valve is quickly opened. The first and second stages of opening are controlled by stroke sensor a18, stroke sensor b17 and stroke sensor c16, and stroke sensor a18 and stroke sensor c16 control the two end stages of the pneumatic actuator.

[0057] Protection mechanism when the air circuit fails: the manual valve in the pipeline is always open, and when the pressure pressure sensor detects that the main air pressure is lower than the set threshold, the electromagnetic valve c is powered, the pressure gas source of the gas tank is supplemented to the main air source, and the valve is realized. Emergency opening and closing.

[0058] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A self-contained sealed intelligent control valve comprising a valve body (1), characterized in that: The valve body (1) is welded with a fixing seat body (4), the fixing seat body (4) is clamped with a sealing seat (5), one side of the sealing seat (5) is provided with a sealing disc (6), the sealing disc (6) is clamped with a bulge (7), a wedge block (8) is arranged between the two bulges (7), the wedge block (8) is connected with a valve stem (15) above, the valve body (1) is provided with a stroke sensor a (18), a stroke sensor b (17) and a stroke sensor c (16) above the valve stem (15).

2. The self-contained sealing smart control valve of claim 1, wherein: The sealing seat (5) is detachably installed on the fixing seat body (4) through four claw-shaped buckles distributed circumferentially.

3. The self-contained sealing smart control valve of claim 1, wherein: The fixing seat body (4) and the sealing seat (5) are provided with a pre-tightening spring or an O-shaped ring (3).

4. The self-contained sealing smart control valve of claim 1, wherein: The sealing surface of the sealing seat (5) is surfacing welded STL, the sealing seat (5) and the seat ring hole of the valve body (1) are clearance fitted, two annular grooves are arranged on the outer circle, a fluorine rubber O-shaped ring is arranged in the first groove to provide sealing function, and a graphite fireproof sealing ring (2) is arranged in the second groove to expand to form secondary sealing in fire.

5. A pneumatic control system for a self-contained sealing smart control valve according to any one of claims 1-4, characterized in that: It comprises a pneumatic actuator (19), a stroke sensor a (18), a stroke sensor b (17), a stroke sensor c (16), a balance valve (21), an electromagnetic valve a (22), a filter pressure reducing valve (23), a gas control valve a (24), a gas control valve b (25), a manual valve (26), a one-way valve (27), an electromagnetic valve b (28), an electromagnetic valve c (29), a throttling speed regulating valve (30) and a gas tank (20).

6. The self-contained sealed smart control valve of claim 5, wherein: The gas tank (20) is connected with the one-way valve (27), the one-way valve (27) is connected with the filter pressure reducing valve (23), the filter pressure reducing valve (23) is connected with the gas control valve a (24), the gas control valve a (24) is connected with the gas control valve b (25), the gas control valve b (25) is connected with the pneumatic actuator (19), the pneumatic actuator (19) is connected with the valve body (1), and the stroke sensor a (18), the stroke sensor b (17) and the stroke sensor c (16) are arranged on the starting actuator.

Images