CN200986498Y - Safety valve online checking device - Google Patents
Safety valve online checking device Download PDFInfo
- Publication number
- CN200986498Y CN200986498Y CNU200620154631XU CN200620154631U CN200986498Y CN 200986498 Y CN200986498 Y CN 200986498Y CN U200620154631X U CNU200620154631X U CN U200620154631XU CN 200620154631 U CN200620154631 U CN 200620154631U CN 200986498 Y CN200986498 Y CN 200986498Y
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- safety valve
- hydraulic jack
- valve
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Abstract
The utility model relates to a safety valve online verification device, and belongs to safety valve verification devices. The safety valve online verification device is provided with a force exerting device. The force exerting device comprises a bracket fixed on the safety valve, a hydraulic oil cylinder fixed on the top of the bracket, a hanger frame fixed under the core shaft of the hydraulic oil cylinder and connected with the valve rod of the safety valve. The utility model can be used to measure the assistant external force through a hydraulic oil cylinder, and the base pressure of the system P can be instantly read on jumping up of the safety valve. Such design overcomes the disadvantage of that force sensors are easily influenced by environmental factors, and will lead to unstable system operation and measuring error. The measuring error is smaller than 1%. A connecting part is used to connect the force exerting part (hydraulic oil cylinder) with the safety valve rod and thus save various connectors connected with the valve rod end screw. The utility model is characterized in simple structure and convenient operation.
Description
Technical field
The utility model relates to the safety valve pick-up unit, particularly the safety valve on-line measuring device.
Background technology
Safety valve is to be installed on boiler, to press and to add overpressure protection apparatus on container and the pressure pipeline, is the guarantee of system safety operation.Be installed on safety valve on the steam boiler because the working temperature height, when it is hot when set-pressure and cold conditions set-pressure exist than big-difference, therefore require safety valve after cold conditions is adjusted, to carry out hot on-line testing, with accurately definite hot opening pressure.Traditional safety valve online thermal calibration technology employing system real method of jumping of boosting realizes, though this method is directly perceived, accurate, but because work under bad environment, take-off often, can cause the damage of sealing surface, produce noise pollution, the cost that boosts is high and wayward, and frequent ascending, descending is pressed quite big to the harm of boiler support equipment.By the on-line testing instrument safety valve being carried out on-line testing is the technology that development in recent years is got up, this technology only needs system pressure is risen to 60%～80% rated pressure, utilize external force that safety valve is drawn jumping, the external force during by the calculating take-off can draw the set-pressure of safety valve.So promptly save collating time, save the adjustment cost, and operate safer.Therefore this technology extensively applies to the online hot adjustment of boiler safety valve.Need advance after changing simultaneously for those safety valve on can't parking apparatus or off-line check set-pressure the safety valve of adjustment again, online measuring technique is also well used.The computing formula of the online detection of safety valve is Ps=Po+Fw/s, wherein Ps is (unlatching) pressure (MPa) of adjusting of safety valve, Po is the system pressure (MPa) of safety valve installed position, the external force when Fw is safety valve jumping up (N), and S is safety valve flap even sealed area (mm
2).Record the instantaneous auxiliary external force Fw of safety valve jumping up, can obtain the opening pressure Ps of safety valve.Use at present comparatively widely the on-line testing instrument all need be equipped with the female adapter of all size, so that be connected with safety valve valve rod end external thread, and the auxiliary external force when adopting force transducer to measure safety valve jumping up, system pressure in the time of when detecting, need shifting to an earlier date input validation simultaneously.Therefore some weak point below when actual verification, existing: the one, force transducer is subjected to factor affecting such as environment temperature and humidity bigger as the precision element of dynamometry, can produce certain deviation when measuring at the scene with the result that the laboratory edits; The 2nd, need the connecting joint of all size to be connected with the valve rod end thread, cause on-line testing instrument complex structure, and must survey the threaded stem of safety valve before the test; The 3rd, before safety valve jumping up, just need input system pressure value P o, and certain hour is arranged at interval this moment during with safety valve jumping up apart, error between the system pressure in the time of therefore can causing the system pressure of input and safety valve jumping up, and then directly have influence on the measuring accuracy of on-line testing instrument.
Summary of the invention
The purpose of this utility model provides a kind of safety valve on-line testing device simple in structure, easy and simple to handle that utilizes hydraulic jack to calculate auxiliary external force, utilize web member that force application element is linked to each other with the safety valve valve rod.
Technical solution of the present utility model is that safety valve on-line testing device is provided with force application apparatus, force application apparatus by can be fixed on carriage on the safety valve, be fixed on the carriage upper end hydraulic jack, be fixed on can the forming of mandrel lower end of hydraulic jack with the suspension bracket that the valve rod of safety valve is connected.
Above-described carriage can be made up of the screw rod and the setscrew nut of upper backup pad, clamp assembly and connection upper backup pad and clamp assembly.
Suspension bracket upper end edge center line of the present utility model can be provided with the internal thread hole that is connected with the mandrel of hydraulic jack, and suspension bracket lower end edge center line is provided with the through hole on the valve rod that can be sleeved on safety valve.
Clamp assembly of the present utility model can be for being connected by two bolts and forming with fixing two pressing plates that are arranged in parallel that are of setting nut, and the middle part of the inboard of two pressing plates is respectively equipped with the outside trapezoid-shaped openings groove of opening.
Principle of work of the present utility model is: load-sensing unit does not adopt the force transducer that is subjected to such environmental effects bigger, calculates auxiliary external force and directly use through Precision Machining and at the hydraulic jack that the laboratory acceptance of the bid is reserved, and calculating is easily understood, and is convenient to the verification personnel and grasps.Utilize the design feature of fall lift safety valve promptly to be furnished with on valve rod to promote and use round nut, design a connection piece is connected force application element with the safety valve valve rod, process the numerous connector of specification thereby save, on the structure simply and also versatility good.System-based pressure P o can read the instantaneous of safety valve jumping up during test, the deviation in the test of having avoided bringing because of the operational instability of process system.When the safety valve flap had just begun the rising displacement is arranged, the pressure before the valve was the opening pressure of safety valve.This moment, gases at high pressure released from the micro gap of flap and sealing surface of seat, can send " crash " sound.Obvious especially to this sound of fall lift safety valve, near safety valve, be easy to monitor, Here it is of the present utility modelly declares out criterion.After hearing that safety valve is opened, note the oil pressure of this moment, and lay down the oil pressure of oil pump immediately, safety valve returns seat immediately, recovers normal operating conditions, can not cause big fluctuation to production status, can guarantee the continuity of producing.For be difficult to differentiate unlatching and maintenance by sound after, need the safety valve of cold conditions level pressure can adopt sonde method to detect, determine the opening of safety valve this moment with probe.The electricity loop is connected when safety valve is opened, and data acquisition system (DAS) is noted the unlatching oil pressure of this moment automatically, thereby records the set-pressure of safety valve.
The utility model has the advantages that and utilize hydraulic jack to calculate auxiliary external force, system-based pressure P o during test, can read the instantaneous of safety valve jumping up, force transducer is subject to such environmental effects and because of the instability of work system operation produces the deficiency of test deviation, test error is less than 1% thereby overcome; Utilize web member that force application element (hydraulic jack) is connected with the safety valve valve rod, save the joint that is connected with the valve rod end thread of all size, thus simple in structure, easy to operate.
Description of drawings
Fig. 1 is a block diagram of the present utility model;
Fig. 2 is the organigram of force application apparatus of the present utility model;
Fig. 3 is along the A-A cut-open view among Fig. 2;
Fig. 4 is the organigram of hydraulic jack of the present utility model.
Embodiment
According to shown in Figure 1, the utility model is made up of force application apparatus 1, hand oil pump 2 and data acquisition and treating apparatus 3.
According to Fig. 2, Fig. 3, force application apparatus 1 of the present utility model is made up of carriage 11, hydraulic jack 12, suspension bracket 13.Wherein carriage 11 is made up of upper backup pad 111, screw rod 112, setscrew nut 113 and clamp assembly 114.Suspension bracket 13 is an elongate frame, and its upper center is processed with threaded hole along center line, and its middle part, lower end is processed with through hole along center line.The middle part of the back up pad 111 of carriage 11 is processed with through hole, is processed with the circular groove of location usefulness when hydraulic jack 12 is installed in the upper end of this through hole.Hydraulic jack 12 is installed in the circular groove of back up pad 111, suspension bracket 13 is installed, suspension bracket 13 is fixed on the lower end of piston rod 123 with set nut 126 in the lower end of its piston rod 123.Clamp assembly 114 is formed by fixedly mount two clamping plate 1143 that become to be arranged in parallel with two connecting screw rods 1141, grip nut 1142.The middle part of the inboard of two clamping plate 1143 is processed with the outside trapezoid-shaped openings groove 1144 of opening respectively.
According to Fig. 4, hydraulic jack 12 is a Precise Oil Cylinder, is made up of cylinder body 121, piston 122, piston rod 123, guidance set 124, tubing interface 125.Wherein the outer end of piston rod 123 is processed with external thread.Utilize hand oil pump 2 to apply oil pressure, thereby driven plunger is done 123 outputs that produce power, the valve rod take-off of pulling safety valve 4 by tubing interface 125.Hydraulic jack 12 is force application elements of safety valve on-line testing device, and the pulling force that hydraulic jack 12 produces is directly proportional with oil pressure, therefore just can record pulling force by the oil pressure value that detects hydraulic jack 12.But as the most key element of on-line testing device, very high to the output accuracy requirement of its power, require good reproducibility simultaneously, so the requirement of the manufacturing accuracy of hydraulic jack 12 such as ovality, surfaceness etc. is quite high.
During use, at first unload the valve bonnet of safety valve 4, the lifting of taking off safety valve 4 is installed in clamp assembly 114 of the present utility model on the safety valve 4 with nut 41, and with the grip nut on the connecting screw rod 1,141 1142 open slot 1144 of two clamping plate 1143 and the valve rod 42 of safety valve 4 is clamped.The two screw rods 112 of on connecting screw rod 1141, screwing on.Back up pad 111 is installed in the upper end of two screw rods 112, back up pad 111 is fixedly mounted on the two screw rods 112, hydraulic jack 12 is installed on back up pad 111 again with fixed bit nut 1 13.The through hole of the lower end of suspension bracket 13 is enclosed within the upper end of the valve rod 42 of safety valve 4, the threaded hole of the upper end of suspension bracket 13 is connected with the external thread of the lower end of the piston rod 123 of hydraulic jack 12, with set nut 126 with the upper end locking of suspension bracket 13 lower end at piston rod 123.Hoisting nut 41 is loaded onto in upper end at the valve rod 42 of safety valve 4.The tubing interface 125 of hydraulic jack 12 is connected with data acquisition and treating apparatus 3 with hand oil pump 2 respectively, in data acquisition and treating apparatus 3, can detects behind the technical parameter of input safety valve 4.Operation hand oil pump 2 makes safety valve 4 take-offs, and data acquisition and treating apparatus 3 are gathered the instantaneous unlatching oil pressure of safety valve 4 take-offs automatically, and calculates the opening pressure of safety valve 4.
Claims (4)
1, safety valve on-line testing device, comprise pressure oil pump, data acquisition and treating apparatus, it is characterized in that being provided with force application apparatus, described force application apparatus by can be fixed on carriage on the safety valve, be fixed on the carriage upper end hydraulic jack, be fixed on can the forming of mandrel lower end of hydraulic jack with the suspension bracket that the valve rod of safety valve is connected.
2, safety valve on-line testing device according to claim 1 is characterized in that carriage is made up of upper backup pad, clamp assembly and the screw rod and the setscrew nut that connect upper backup pad and clamp assembly.
3, safety valve on-line testing device according to claim 1 is characterized in that suspension bracket upper end edge center line is provided with the internal thread hole that is connected with the mandrel of hydraulic jack, and suspension bracket lower end edge center line is provided with the through hole on the valve rod that can be sleeved on safety valve.
4, safety valve on-line testing device according to claim 2, it is characterized in that clamp assembly is to be connected and formed with fixing two pressing plates that are arranged in parallel that are of setting nut by two bolts, the middle part of the inboard of two pressing plates is respectively equipped with the outside trapezoid-shaped openings groove of opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200620154631XU CN200986498Y (en) | 2006-12-12 | 2006-12-12 | Safety valve online checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200620154631XU CN200986498Y (en) | 2006-12-12 | 2006-12-12 | Safety valve online checking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200986498Y true CN200986498Y (en) | 2007-12-05 |
Family
ID=38915955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200620154631XU Expired - Lifetime CN200986498Y (en) | 2006-12-12 | 2006-12-12 | Safety valve online checking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200986498Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406781A (en) * | 2014-11-26 | 2015-03-11 | 广西华银铝业有限公司 | On-line safety valve checking method and device |
| CN104990700A (en) * | 2015-07-17 | 2015-10-21 | 中船重工特种设备有限责任公司 | Explosion valve test device |
| CN106706304A (en) * | 2017-03-03 | 2017-05-24 | 广东省特种设备检测研究院湛江检测院 | On-line verification device for lever-type safety valve |
-
2006
- 2006-12-12 CN CNU200620154631XU patent/CN200986498Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406781A (en) * | 2014-11-26 | 2015-03-11 | 广西华银铝业有限公司 | On-line safety valve checking method and device |
| CN104406781B (en) * | 2014-11-26 | 2017-10-20 | 广西华银铝业有限公司 | A kind of on-line check method for safety valve and device |
| CN104990700A (en) * | 2015-07-17 | 2015-10-21 | 中船重工特种设备有限责任公司 | Explosion valve test device |
| CN104990700B (en) * | 2015-07-17 | 2018-06-26 | 中船重工特种设备有限责任公司 | Explosion valve test device |
| CN106706304A (en) * | 2017-03-03 | 2017-05-24 | 广东省特种设备检测研究院湛江检测院 | On-line verification device for lever-type safety valve |
| CN106706304B (en) * | 2017-03-03 | 2023-09-05 | 广东省特种设备检测研究院湛江检测院 | Lever type safety valve online verification device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071205 |
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| EXPY | Termination of patent right or utility model |