CN112577732A - Online detection device and online detection method for safety valve - Google Patents
Online detection device and online detection method for safety valve Download PDFInfo
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- CN112577732A CN112577732A CN202011459962.5A CN202011459962A CN112577732A CN 112577732 A CN112577732 A CN 112577732A CN 202011459962 A CN202011459962 A CN 202011459962A CN 112577732 A CN112577732 A CN 112577732A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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Abstract
The invention relates to the technical field of safety valves, and discloses an online detection device and an online detection method of a safety valve, which comprise a valve seat, a valve pipe, a valve cover, a valve rod and a pressure difference adjusting mechanism, wherein a through hole is formed in the center of the inside of the valve seat; the air compressor comprises a sealing joint and a medium input pipeline, wherein an air outlet pipe and a water outlet pipe are horizontally inserted into the upper side and the lower side of the inside of the sealing joint respectively, and an air compressor and a booster water pump are arranged on one side of the bottom of the medium input pipeline. The invention not only prolongs the service life of the safety valve by arranging the double multilayer sealing structure and the bidirectional elastic pressure regulating structure, but also facilitates the positioning and installation of the detection assembly, thereby realizing the high-efficiency online detection function and improving the detection and troubleshooting efficiency.
Description
Technical Field
The invention relates to the technical field of safety valves, in particular to an online detection device and an online detection method for a safety valve.
Background
The safety valve is a valve with fault protection function, mainly used as safety accessories on special pressure-bearing equipment such as filtering equipment and pressure vessels, and used for protecting the operation safety of closed system equipment. For example, when the pressure in the protected equipment exceeds the designed pressure, the pressure relief valve can be automatically opened to discharge and reduce the medium with over-high pressure in the equipment, so that the equipment is prevented from being damaged by overpressure, and when the pressure in the equipment is reduced to a set value, the pressure relief valve can be automatically closed along with the medium, so that the equipment can continuously and normally work.
The regular detection items of the safety valve mainly comprise aspects of appearance damage, setting pressure, sealing pressure and the like. Wherein the appearance damage comprises the identification of whether each component has cracks, corrosion or mechanical damage; the setting pressure, also called opening pressure, is a predetermined pressure at which it starts to open under operating conditions, at which pressure and at the specified operating conditions the force generated by the medium pressure that opens the valve and the force that keeps the flap on the valve seat are balanced with each other; the sealing pressure is the static inlet pressure at which the sealing test is carried out, at which the leakage rate through the sealing surface of the closure member is measured.
There is a patent of CN106051240B, which is a technology for online detection of a safety valve without detaching the safety valve by providing an inflow passage of a detection medium on a valve seat of the safety valve. However, in this scheme, the optimization of the safety valve body assembly is lacked, so that the airtight structure inside the safety valve is not effectively improved; meanwhile, the detection medium inflow channel is arranged on the input port of the valve seat, part of detection medium can enter a working pipeline to cause pollution during actual operation, and all detection components are relatively dispersed, so that the installation process is complicated; in addition, the scheme only focuses on air tightness detection, lacks a detection function of medium leakage of a sealing surface, and cannot eliminate fault causes to obtain an optimal maintenance scheme. Therefore, those skilled in the art have provided an online detection device and an online detection method for a safety valve to solve the above problems in the background art.
Disclosure of Invention
The present invention is directed to an online detection device and an online detection method for a safety valve, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a safety valve, includes disk seat, valve pipe, valve gap, valve rod and pressure differential adjustment mechanism, the inside central point of disk seat puts the department and is provided with the opening, the left end of disk seat is provided with input port, just input port and working pipeline flange intercommunication, the right-hand member of disk seat is provided with output port, detection port has been seted up to the bottom of disk seat, the top flange mounting of disk seat the valve pipe, just the top flange mounting of valve pipe the valve gap, the top cover of valve rod is equipped with the hand wheel, just the bottom axial of hand wheel inlay in the top of valve gap, the bottom of valve rod passes in proper order the valve gap the valve tube extend to the middle part of disk seat, the middle part cover of valve rod is equipped with pressure differential adjustment mechanism, just pressure differential adjustment mechanism is located in the valve pipe, pressure differential adjustment mechanism includes retaining ring, lower retaining ring and spring, the bottom suit of valve rod has the valve clack, just the valve clack axial inlay in the opening.
As a still further scheme of the invention: the opening input port and the working pipeline all is the notch cuttype structure.
As a still further scheme of the invention: and a sealing gasket is embedded at the bottom of the valve pipe, the sealing gasket is formed by overlapping a plurality of layers of conical structures, and the outer side wall of the valve rod is in contact with the inner side wall of the sealing gasket.
As a still further scheme of the invention: the upper retainer ring and the lower retainer ring are sleeved in the middle of the valve rod at intervals of one upper part and one lower part, the spring is sleeved on the valve rod on one side of the upper retainer ring and the lower retainer ring, one end of the spring is welded with one side of the upper retainer ring and one side of the lower retainer ring, and the other end of the spring is welded with the inner side wall of the valve pipe.
As a still further scheme of the invention: the lateral wall of valve clack bottom is gone up to be equipped with the silica gel packing ring, just the bottom of silica gel packing ring is the toper domatic and with the top of opening gomphosis each other.
The utility model provides an on-line measuring device of relief valve, includes sealing joint and medium input pipeline, sealing joint's one end inlay in the output port, outlet duct, outlet pipe have been inserted to the inside upper and lower both sides level respectively of sealing joint, just pointer manometer is installed on the top of outlet duct, the top of medium input pipeline with the bottom flange switch-on of detection port, one side of medium input pipeline bottom is provided with air compressor machine, booster water pump, just the air compressor machine with booster water pump's output all with medium input pipeline level intercommunication.
As a still further scheme of the invention: the air outlet pipe and the water outlet pipe are both in an L-shaped structure and are symmetrically distributed.
As a still further scheme of the invention: and electromagnetic valves are arranged at the output ends of the air compressor and the booster water pump.
An online detection method for a safety valve comprises the following steps:
A. sealing the interface of the input port and the working pipeline, checking the appearances of a valve seat, a valve pipe, a valve cover, a valve rod and the like, and identifying whether cracks, corrosion or mechanical damage exists on the surface;
B. opening the sealing joint, discharging a working medium, connecting the top end of a medium input pipeline with a bottom end flange of the detection port, sequentially connecting an air compressor and a booster water pump, and embedding one end of the sealing joint in the output port;
C. firstly, opening an electromagnetic valve at a booster water pump, starting the booster water pump, filling pure water to the bottom of a valve seat through a medium input pipeline, observing for 10-15 minutes, and if a water outlet pipe is leaked, indicating that the valve clack or a silica gel gasket is damaged at the through hole and needs to be replaced;
D. after the through hole is determined to be intact, starting a booster water pump to reversely rotate to pump out the purified water;
E. then opening an electromagnetic valve at the air compressor, starting the air compressor, injecting pure nitrogen into the bottom of the valve seat through a medium input pipeline, jacking the valve clack upwards along with the rise of air pressure and when the air pressure is higher than the set pressure at the pressure difference adjusting mechanism, and opening a through hole so that residual medium and nitrogen are mixed and discharged through an air outlet pipe and a water outlet pipe in the sealing joint;
F. closing the air compressor, standing for 2-3 minutes, discharging the mixed medium in the valve seat, simultaneously lowering the valve clack for resetting, and tightly plugging the through hole through a silica gel gasket;
G. and E, repeating the step E again, simultaneously observing the action of the pointer type pressure gauge and the valve rod and timing, starting to rotate the pointer type pressure gauge from 0 when the injection is kept for 4-5 minutes, gradually rising the top end of the valve rod, continuously injecting, recording the pressure reading and the rising height every second, closing the air compressor after 2 minutes, stopping recording, comparing the recording result with the initial and historical set pressure values, and if the deviation is more than 2%, indicating that the internal damage degree of the valve seat or the valve pipe exceeds the allowable range and needs to be integrally replaced.
Compared with the prior art, the invention has the beneficial effects that:
1. the bottom of the valve pipe is embedded with a sealing washer formed by overlapping a plurality of layers of conical structures, the sealing performance of the bottom of the valve rod is enhanced, one sides of the upper retainer ring and the lower retainer ring which are distributed at intervals are provided with a spring for elastically limiting the maximum lifting height and avoiding the valve clack from being collided and damaged, and the bottom of the valve pipe is sleeved with a silica gel washer, and the conical slope surface at the bottom of the silica gel washer is tightly embedded with the through hole to enhance the sealing, so that the service life of the safety valve is prolonged;
2. the bottom end of the valve seat is provided with the detection port, so that components such as a medium input pipeline, an air compressor, a booster water pump and the like can be connected externally without disassembling a working pipeline, and the components such as an air outlet pipe, a water outlet pipe and the like can be connected by inserting the sealing joint at the output port, so that the high-efficiency online detection function is realized;
3. the valve seat is cleaned through reverse pumping, then nitrogen is continuously injected through the air compressor to carry out setting pressure detection, whether the valve seat needs to be integrally replaced or not can be obtained through data comparison, and therefore detection and troubleshooting efficiency is improved.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic side view of an input port of the present invention;
FIG. 3 is a schematic diagram of the valve tube of the present invention;
FIG. 4 is a schematic perspective view of a valve stem of the present invention;
FIG. 5 is an enlarged view taken at A of FIG. 1 according to the present invention;
FIG. 6 is an enlarged view of the position B of FIG. 1 according to the present invention.
In the figure: 1. a valve seat; 2. a port; 3. an input port; 4. a working pipeline; 5. an output port; 6. sealing the joint; 7. an air outlet pipe; 8. a pointer type pressure gauge; 9. a water outlet pipe; 10. a detection port; 11. a media input conduit; 12. an electromagnetic valve; 13. an air compressor; 14. a booster water pump; 15. a valve tube; 16. a sealing gasket; 17. a valve cover; 18. a valve stem; 19. a hand wheel; 20. a differential pressure adjusting mechanism; 2001. an upper retainer ring; 2002. a lower retainer ring; 2003. a spring; 21. a valve flap; 22. a silica gel gasket.
Detailed Description
Referring to fig. 1 to 6, in the embodiment of the present invention,
a safety valve comprises a valve seat 1, a valve pipe 15, a valve cover 17, a valve rod 18 and a pressure difference adjusting mechanism 20, wherein a through hole 2 is formed in the center of the inside of the valve seat 1, an input port 3 is formed in the left end of the valve seat 1, the input port 3 is communicated with a working pipeline 4 in a flange mode, an output port 5 is formed in the right end of the valve seat 1, a detection port 10 is formed in the bottom end of the valve seat 1, the valve pipe 15 is mounted on the top end of the valve seat 1 in a flange mode, the valve cover 17 is mounted on the top end of the valve pipe 15, a hand wheel 19 is sleeved on the top end of the valve rod 18, the bottom of the hand wheel 19 is axially embedded in the top of the valve cover 17, the bottom of the valve rod 18 sequentially penetrates through the valve cover 17 and the valve pipe 15 and extends to the middle of the valve seat 1, the pressure difference adjusting mechanism 20, the bottom end of the valve stem 18 is fitted with a flap 21, and the flap 21 is axially inserted into the through opening 2.
In fig. 1, 2 and 5: the through port 2, the input port 3 and the working pipeline 4 are of stepped structures and are used for embedded butt joint to enhance the sealing property; a sealing washer 16 is embedded at the bottom of the valve pipe 15, the sealing washer 16 is formed by overlapping a plurality of layers of conical structures, and the outer side wall of the valve rod 18 is in contact with the inner side wall of the sealing washer 16, so that the sealing property of the bottom of the valve rod 18 is improved, and the medium leakage is avoided; the outer side wall of the bottom of the valve clack 21 is sleeved with a silica gel gasket 22, and the bottom of the silica gel gasket 22 is a conical slope surface and is mutually embedded with the top of the through hole 2, so that the sealing performance of the through hole 2 is enhanced, and medium leakage is avoided;
in fig. 1, 3 and 4: the upper retaining ring 2001 and the lower retaining ring 2002 are sleeved in the middle of the valve rod 18 at intervals from top to bottom, the spring 2003 is sleeved on the valve rod 18 on one side of the upper retaining ring 2001 and one side of the lower retaining ring 2002, one end of the spring 2003 is welded with one side of the upper retaining ring 2001 and one side of the lower retaining ring 2002 respectively, the other end of the spring 2003 is welded with the inner side wall of the valve pipe 15, the lifting amplitude of the valve rod 18 is limited, and damage caused by severe collision of the valve clack 21 due to excessive lifting is avoided.
The utility model provides an on-line measuring device of relief valve, including sealing joint 6 and medium input pipeline 11, the one end of sealing joint 6 is inlayed in output port 5, the inside upper and lower both sides of sealing joint 6 are respectively inserted horizontally the outlet duct 7, outlet pipe 9, and pointer manometer 8 is installed on the top of outlet duct 7, the top of medium input pipeline 11 and the bottom flange switch-on of detection port 10, one side of medium input pipeline 11 bottom is provided with air compressor machine 13, booster water pump 14, and air compressor machine 13 all communicates with medium input pipeline 11 level with booster water pump 14's output.
In fig. 1: the air outlet pipe 7 and the water outlet pipe 9 are both in an L-shaped structure and are symmetrically distributed for exhausting or draining, so that the air tightness of different parts is reflected respectively, and fault sites are conveniently eliminated; electromagnetic valves 12 are mounted on the output ends of the air compressor 13 and the booster water pump 14, and are used for automatically controlling the input and output of media.
An online detection method for a safety valve comprises the following steps:
A. the interface between the input port 3 and the working pipeline 4 is closed, the appearances of the valve seat 1, the valve pipe 15, the valve cover 17, the valve rod 18 and the like are checked, and whether cracks, corrosion or mechanical damage exists on the surface is identified;
B. opening the sealing joint 6, discharging a working medium, connecting the top end of a medium input pipeline 11 with a bottom end flange of the detection port 10, sequentially connecting an air compressor 13 and a booster water pump 14, and embedding one end of the sealing joint 6 in the output port 5;
C. firstly, opening an electromagnetic valve 12 at a booster water pump 14, starting the booster water pump 14, filling purified water to the bottom of the valve seat 1 through a medium input pipeline 11, observing for 10-15 minutes, and if a water leakage exists at a water outlet pipe 9, indicating that a valve clack 21 or a silica gel gasket 22 at a through opening 2 is damaged and needs to be replaced;
D. after the through opening 2 is determined to be intact, the booster water pump 14 is started to reversely pump purified water;
E. then the electromagnetic valve 12 at the air compressor 13 is opened, the air compressor 13 is started, pure nitrogen is injected to the bottom of the valve seat 1 through the medium input pipeline 11, the valve clack 21 is jacked upwards when the air pressure rises and is greater than the set pressure at the differential pressure adjusting mechanism 20, the through port 2 is opened, and the residual medium and the nitrogen are mixed and discharged through the air outlet pipe 7 and the water outlet pipe 9 in the sealing joint 6;
F. closing the air compressor 13, standing for 2-3 minutes, and after the mixed medium in the valve seat 1 is completely discharged, simultaneously lowering the valve clack 21 to reset, and tightly plugging the through hole 2 through a silica gel gasket 22;
G. and E, repeating the step E again, simultaneously observing the actions of the pointer type pressure gauge 8 and the valve rod 18 and timing, starting to rotate the pointer type pressure gauge 8 from 0 when the injection is kept for 4-5 minutes, gradually rising the top end of the valve rod 18, continuing to inject, recording the pressure reading and the rising height every 10 seconds, closing the air compressor 13 after 2 minutes, stopping recording, comparing the recording result with the initial and historical setting pressure values, and if the deviation is more than 2%, indicating that the internal damage degree of the valve seat 1 or the valve pipe 15 exceeds the allowable range and needs to be integrally replaced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. The safety valve comprises a valve seat (1), a valve pipe (15), a valve cover (17), a valve rod (18) and a pressure difference adjusting mechanism (20), and is characterized in that a through opening (2) is formed in the center position inside the valve seat (1), an input port (3) is formed in the left end of the valve seat (1), the input port (3) is communicated with a working pipeline (4) through a flange, an output port (5) is formed in the right end of the valve seat (1), a detection port (10) is formed in the bottom end of the valve seat (1), the valve pipe (15) is installed on the top end of the valve seat (1), the valve cover (17) is installed on the top end flange of the valve pipe (15), a hand wheel (19) is installed on the top end of the valve rod (18) in a sleeved mode, the bottom of the hand wheel (19) is axially embedded into the top of the valve cover (17), and the bottom of the valve rod (18, The valve comprises a valve pipe (15) and a valve seat (1), wherein a pressure difference adjusting mechanism (20) is sleeved in the middle of the valve rod (18), the pressure difference adjusting mechanism (20) is located in the valve pipe (15), the pressure difference adjusting mechanism (20) comprises an upper retainer ring (2001), a lower retainer ring (2002) and a spring (2003), a valve clack (21) is sleeved at the bottom end of the valve rod (18), and the valve clack (21) is axially embedded in a through hole (2).
2. A safety valve according to claim 1, characterized in that the through opening (2), the inlet port (3) and the working pipe (4) are of stepped configuration.
3. A safety valve according to claim 1, characterized in that the bottom of the valve tube (15) is embedded with a sealing gasket (16), the sealing gasket (16) is formed by overlapping a plurality of layers of conical structures, and the outer side wall of the valve stem (18) and the inner side wall of the sealing gasket (16) are in contact with each other.
4. A safety valve according to claim 1, wherein the upper retainer ring (2001) and the lower retainer ring (2002) are fitted around the middle portion of the valve stem (18) at an upper and lower interval, and the spring (2003) is fitted around the valve stem (18) on one side of the upper retainer ring (2001) and the lower retainer ring (2002), one end of the spring (2003) is welded to one side of the upper retainer ring (2001) and one side of the lower retainer ring (2002), respectively, and the other end of the spring (2003) is welded to the inner side wall of the valve tube (15).
5. A safety valve according to claim 1, characterized in that a silicone gasket (22) is sleeved on the outer side wall of the bottom of the valve flap (21), and the bottom of the silicone gasket (22) is a tapered slope and is mutually embedded with the top of the through hole (2).
6. The online detection device of the safety valve according to any one of claims 1 to 5, comprising a sealing joint (6) and a medium input pipeline (11), wherein one end of the sealing joint (6) is embedded in the output port (5), an air outlet pipe (7) and an water outlet pipe (9) are respectively and horizontally inserted into the upper side and the lower side of the interior of the sealing joint (6), a pointer type pressure gauge (8) is installed at the top end of the air outlet pipe (7), the top end of the medium input pipeline (11) is communicated with a bottom end flange of the detection port (10), an air compressor (13) and a booster water pump (14) are arranged on one side of the bottom of the medium input pipeline (11), and the output ends of the air compressor (13) and the booster water pump (14) are both horizontally communicated with the medium input pipeline (11).
7. The on-line detection device for the safety valve according to claim 6, wherein the air outlet pipe (7) and the water outlet pipe (9) are both in an L-shaped structure and are symmetrically distributed.
8. The on-line detection device for the safety valve according to claim 6, wherein the output ends of the air compressor (13) and the booster water pump (14) are both provided with electromagnetic valves (12).
9. The on-line detection method for the safety valve according to any one of claims 1 to 8, characterized by comprising the following steps:
A. the interface between the input port (3) and the working pipeline (4) is closed, the appearances of the valve seat (1), the valve pipe (15), the valve cover (17), the valve rod (18) and the like are checked, and whether cracks, corrosion or mechanical damage exists on the surface is identified;
B. opening the sealing joint (6), discharging working media, communicating the top end of a medium input pipeline (11) with a bottom end flange of a detection port (10), sequentially communicating an air compressor (13) and a booster water pump (14), and embedding one end of the sealing joint (6) in an output port (5);
C. firstly, opening an electromagnetic valve (12) at a booster water pump (14), starting the booster water pump (14), filling purified water to the bottom of a valve seat (1) through a medium input pipeline (11), observing for 10-15 minutes, and if the water outlet pipe (9) has a leakage, indicating that the valve flap (21) or a silica gel gasket (22) at a through hole (2) is damaged and needs to be replaced;
D. after the through opening (2) is determined to be intact, a booster water pump (14) is started to reversely pump purified water;
E. then opening an electromagnetic valve (12) at the air compressor (13), starting the air compressor (13), injecting pure nitrogen into the bottom of the valve seat (1) through a medium input pipeline (11), jacking up a valve flap (21) when the air pressure rises and is greater than the set pressure at the pressure difference adjusting mechanism (20), and opening a through hole (2) to ensure that residual medium and nitrogen are mixed and discharged through an air outlet pipe (7) and a water outlet pipe (9) in a sealing joint (6);
F. closing the air compressor (13), standing for 2-3 minutes, and when the mixed medium in the valve seat (1) is completely discharged, lowering the valve clack (21) to reset, and tightly plugging the through hole (2) through a silica gel gasket (22);
G. and E, repeating the step E again, simultaneously observing the actions of the pointer type pressure gauge (8) and the valve rod (18) and timing, starting to rotate the pointer type pressure gauge (8) from 0 when the injection is kept for 4-5 minutes, gradually ascending the top end of the valve rod (18), continuing to inject, recording the pressure reading and the ascending height every 10 seconds, closing the air compressor (13) after 2 minutes, stopping recording, comparing the recording result with the initial and historical set pressure values, and if the deviation is more than 2%, indicating that the internal damage degree of the valve seat (1) or the valve pipe (15) exceeds an allowable range and needing to be integrally replaced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011459962.5A CN112577732B (en) | 2020-12-11 | 2020-12-11 | Online detection device and online detection method for safety valve |
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| CN202011459962.5A CN112577732B (en) | 2020-12-11 | 2020-12-11 | Online detection device and online detection method for safety valve |
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| Publication number | Publication date |
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| CN112577732B (en) | 2023-04-28 |
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