CN112128440B - Diaphragm type internal ballast overpressure relief device - Google Patents
Diaphragm type internal ballast overpressure relief device Download PDFInfo
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- CN112128440B CN112128440B CN202011106906.3A CN202011106906A CN112128440B CN 112128440 B CN112128440 B CN 112128440B CN 202011106906 A CN202011106906 A CN 202011106906A CN 112128440 B CN112128440 B CN 112128440B
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- diaphragm
- pressure
- base
- cutter head
- cabin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
- F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
- F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
- F16K17/1613—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type with additional cutting means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention belongs to the technical field of pressure vessel design, and particularly relates to a diaphragm type internal pressure cabin overpressure relief device. The bleeder device comprises a diaphragm, a base, a pressing flange, an arched support, a cutter head, an adjusting rod and a protection mechanism. The invention relates to a diaphragm type internal ballast overpressure relief device which adopts a positive arch common conical surface bracket type metal rupture disc structure and mainly has the function of preventing the pressure in an internal pressure cabin from being sharply increased to damage facilities in the cabin when an accident occurs in a test in the internal pressure cabin so as to ensure the emergency relief when the pressure in the cabin exceeds a specified value.
Description
Technical Field
The invention belongs to the technical field of pressure vessel design, and particularly relates to a diaphragm type internal pressure cabin overpressure relief device.
Background
The inner pressure cabin belongs to a certain aeroengine tester, realizes the regulation of the outlet exhaust/air exhaust pressure of the tester, collects the outlet airflow of the tester and then exhausts the outlet airflow through the exhaust pipe to control the exhaust noise, so as to meet the regulation requirements of the tester on test backpressure during exhaust collection, test noise control and test, and the cabin is communicated with air with certain pressure and temperature, and has the protection effect on test safety.
The existing safe discharge device technology is mainly applied to the fields of coal mine excavation, storage tanks, fire fighting and the like, and if the technology is taken into the technical field, the technology cannot be used at all; in addition, the prior art adopts pressure relief valve devices, so that the problem of low reliability of a pressure relief valve body exists; the simple arch rupture disk structure is adopted, but the safe release with different pressures and large release amount cannot be considered.
Disclosure of Invention
The purpose of the invention is as follows:
the overpressure relief device of the diaphragm type inner pressure cabin adopts a positive arch common conical surface bracket type metal rupture disc structure, and is a relief device for preventing the pressure in the cabin from being suddenly increased to damage facilities in the cabin due to accidents in the test so as to ensure the emergency relief when the pressure in the cabin exceeds a specified value.
The technical scheme of the invention is as follows:
a diaphragm internal pressure chamber overpressure relief apparatus comprising: the device comprises a diaphragm, a base, a pressing flange, an arch support, a cutter head, an adjusting rod and a protection mechanism;
the base is arranged at the opening position of the cabin body; the pressing flange tightly presses the periphery of the diaphragm on the base, and the structure of the base has a supporting effect on the diaphragm: two ends of the arch support are fixedly connected with the inner side surface of the pressing flange; the adjusting rod is arranged on the arch support; the adjusting end of the adjusting rod is provided with a cutter head; the cutter head is tightly propped against the diaphragm on the base; the protection mechanism is fixedly connected to the pressing flange, and the bow-shaped support, the cutter head and the adjusting rod are positioned in a space formed between the protection mechanism and the membrane;
when the gas pressure in the cabin body is increased, the diaphragm is ejected out towards the direction of the cutter head, and the pressure between the cutter head and the diaphragm is increased until the cutter head breaks the diaphragm.
The protection mechanism includes: a hemispherical shield, a shield frame, a shield ring; the shield frame and the shield ring are used as a support of the shield to play a supporting role.
The diaphragm is a circular metal sheet, the diameter of the diaphragm is larger than that of the base, holes matched with the bolt holes in the base are formed in the periphery of the diaphragm, and the thickness of the diaphragm is determined by the internal pressure.
The base is a flange with threaded holes near the periphery, the middle part of the flange is provided with six cylindrical ribs with certain thickness and height and diameters from large to small, a cross-shaped vertical rib is added among the cylinders to form a normal arch common conical bracket by casting, and the section of each rib is in a round-head conical shape with the small top and the large bottom;
when the pressure of the cabin body and the external pressure is balanced, the ribs support the diaphragm.
The welded structure formed by the pressing flange and the arch support supports the adjusting rod.
Holes matched with the bolt holes on the base are formed near the periphery of the compression flange, adjusting holes matched with the adjusting rods are formed at the upper ends of the arched supports, and bolt hole sections are arranged in the adjusting holes; the middle part of the adjusting rod is provided with an adjusting thread matched with the screw hole section.
The shape of the cutter head is a flat-head cone with four arc grooves on the conical surface.
The protective cover is formed by welding a semispherical protective cover frame consisting of seven circular protective cover rings with different diameters and four pairs of semi-circular protective cover frames.
The invention has the beneficial effects that:
the diaphragm type internal ballast overpressure relief device works in a positive pressure state on the basis of meeting the air flow parameters required by an internal pressure chamber, and the intensity of the relief device is calculated according to GB150-1998 steel pressure vessel. And (4) carrying out strength examination calculation on the upper hole section and the blasting diaphragm of the test cabin, and examining the stability and accuracy of the shell of the discharge device to obtain the structure.
The relief device is an important safety component in the inner ballast, and the diaphragm type inner ballast overpressure relief device adopts a positive arch common conical surface bracket type metal rupture disc structure and mainly has the function of preventing the cabin from being damaged by accidents and sudden pressure increase in the cabin during testing.
The diaphragm type internal pressure cabin overpressure relief device for the engine tester in China has a plurality of structural forms according to the use conditions, the novel diaphragm type internal pressure cabin overpressure relief device is simple in structure and only comprises a base supporting sheet, a supporting and jacking part and a protection part, and the diaphragm type internal pressure cabin overpressure relief device has the advantages of being simple in processing technology, low in cost, suitable for manufacturing relief devices of various sizes and capable of meeting the overpressure relief requirements of internal pressure cabins. In addition, the device has no related auxiliary facilities and is simple to install, the production cost is further reduced, and the device has a high application value.
Drawings
FIG. 1 is a schematic view of a diaphragm type internal ballast overpressure relief apparatus;
fig. 2 is a top view of the vent base.
FIG. 3 is a top view of the tapping device support frame;
FIG. 4 is an enlarged elevational view of the bleeder device cutting head;
fig. 5 is a top view of the vent apparatus shield.
Wherein, 1-diaphragm, 2-base, 3-pressing flange, 4-bow support, 5-cutter head, 6-regulating rod, 7-protective cover, 8-protective cover frame, 9-protective cover ring.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
referring to fig. 1, a diaphragm type overpressure relief device for an internal pressure chamber comprises a diaphragm 1, a base 2, a pressing flange 3, an arch support 4, a cutter head 5, an adjusting rod 6, a protective cover 7, a protective cover frame 8 and a protective cover ring 9.
The bleeder device main body is composed of a bleeder device main body and a diaphragm 1, wherein the bleeder device main body is composed of an adjusting rod 6 arranged on an arched support 4 and a cutter head 5 tightly pressed on a base 2, the base 2 and a pressing flange 3 press the periphery of the diaphragm 1, and a hemispherical protective cover 7, a protective cover frame 8 and a protective cover ring 9 are arranged outside the arched support 4.
The diaphragm 1 is a circular metal sheet, the diameter of the diaphragm is slightly larger than that of the base 2, holes matched with the bolt holes in the base 2 are formed near the periphery of the diaphragm 1, and the thickness of the diaphragm 1 is determined by the internal pressure.
Referring to the attached drawings 1 and 2, a base 2 is a flange with threaded holes near the periphery, six cylindrical ribs with certain thickness and height and diameters from large to small are arranged in the middle of the flange, a cross-shaped vertical rib is added between the cylinders to form a normal arch common conical bracket by casting, and the section of each rib is in a round-head conical shape with the upper part small and the lower part large.
Referring to the attached drawings 1 and 3, a pressing flange 3 and an arch support 4 are welded together to form a support of an adjusting rod 6, holes matched with bolt holes on a base 2 are formed near the periphery of the pressing flange 3, and an adjusting bolt hole section matched with the adjusting rod 6 is arranged at the upper end of the arch support 4.
Referring to the attached drawings 1 and 4, the diaphragm 1 is tightly supported and formed by connecting a cutter head 5 and an adjusting rod 6, the cutter head 5 is a flat-head cone with four arc grooves on the conical surface, and the section of the middle part of the adjusting rod 6, which is matched with the arch support 4, is provided with an adjusting thread.
Referring to fig. 1 and 5, the shield 7 is formed by welding a hemispherical shape formed by seven circular shield rings 9 with different diameters and four pairs of half-circular shield frames 8.
The overpressure relief device of the diaphragm type internal pressure cabin adopts a positive arch common conical surface bracket type metal rupture disc structure, and the relevant calculation of the overpressure relief device is as follows.
Safe discharge amount of the container: w s ＝2.83×10 -3 ρvd 2
Rupture disk discharge area:
in the formula: w is a group of S -safe discharge of the vessel, kg/h;
rho-density of gas at relief pressure, kg/m 3 ；
v-flow velocity in the vessel feed tube, m/s;
d, the diameter of the feeding pipe of the container is mm;
a-rupture disk discharge area, mm 2 ；
C-gas characteristic coefficient;
k' -the rated relief factor of the rupture disk;
P b -the design burst pressure of the rupture disc, MPa;
m-molar mass of gas, kg/kmol;
t-gas temperature at the inlet side of the bleed device, K;
z is the compressibility of the gas.
Test pressure:
and (4) stress checking:
in the formula: p is the design pressure, MPa;
[ sigma ] -allowable stress of the material at the test temperature, MPa;
[σ] t -allowable stress, MPa, of the material at the design temperature;
D i -cylinder inside diameter, mm;
δ e -effective thickness of the cylinder, mm;
σ s -yield point, MPa, of the material at the test temperature;
σ 0.2 -0.2% yield strength, MPa, of the material at the test temperature;
phi-weld joint coefficient.
A wire mesh can also be arranged in the protective cover of the relief device as required to prevent fragments with certain sizes generated when the diaphragm bursts. The quality of the installation quality of the silk screen is related to the operation safety, and foreign matters outside the device can be blocked so as to ensure the cleanliness requirement in the device; the replacement, cleaning and the like of the dust screen are considered when fixing the screen.
When designing the overpressure relief device, the matching and balance of the use parameters of the internal pressure cabin test state need to be comprehensively considered. When the rupture disk is calculated, the selection of parameters such as the gas release amount in the cabin, the flow velocity in the feeding pipe, the diameter in the feeding pipe, the discharge area of the rupture disk, the design burst pressure of the rupture disk and the like is strived to be accurate; after the test pressure and the check calculation, a real object parameter test is required to be carried out so as to ensure that the discharge device can safely and reliably meet the discharge parameters of the internal pressure cabin.
The relief device is an important safety part in the inner ballast, and the diaphragm type inner ballast overpressure relief device adopts a positive arch common conical surface bracket type metal rupture disc structure and mainly has the functions of preventing accidents from occurring in the cabin during a belt pressure test and preventing the pressure in the cabin from being sharply increased to damage facilities in the cabin; the device has simple structure, easy manufacture and good use effect, is originally created at home at present, and has original originality compared with foreign technologies in design means and methods.
The above embodiments disclose common embodiments of the diaphragm type internal ballast overpressure relief device of the present invention, but are not limited to the above embodiments, and further improvements can be made on the basis of the above disclosures. If the usage amount of the relief device is increased, the size and thickness of the diaphragm are changed, the bending degree of the diaphragm is changed, the position of a tool bit of the adjusting rod is changed, the designed blasting pressure of the blasting sheet is changed, the structural form of the protective cover is changed and the like according to the gas usage parameters and the requirements of the internal pressure cabin. High temperature application has higher requirements on processing materials, welding deformation control, processing precision, repair technology and clearance control. The discharge device has a great practical application value in the application of safe overpressure discharge of similar internal pressure cabins with different use temperatures and pressures.
Claims (6)
1. A diaphragm-type internal pressure chamber overpressure relief apparatus, comprising: the device comprises a diaphragm, a base, a pressing flange, an arch support, a cutter head, an adjusting rod and a protection mechanism;
the base is arranged at the opening position of the cabin body; the pressing flange tightly presses the periphery of the diaphragm on the base, and the structure of the base has a supporting effect on the diaphragm: two ends of the arch support are fixedly connected with the inner side surface of the pressing flange; the adjusting rod is arranged on the arch support; the adjusting end of the adjusting rod is provided with a cutter head; the cutter head is tightly propped against the membrane on the base; the protection mechanism is fixedly connected to the pressing flange, and the arch support, the cutter head and the adjusting rod are positioned in a space formed between the protection mechanism and the membrane;
when the gas pressure in the cabin body is increased, the diaphragm is ejected out towards the direction of the cutter head, and the pressure between the cutter head and the diaphragm is increased until the cutter head breaks the diaphragm;
the base is a flange with threaded holes near the periphery, the middle part of the flange is provided with six cylindrical ribs with certain thickness and height and diameters from large to small, a cross-shaped vertical rib is added among the cylinders to form a normal arch common conical bracket by casting, and the section of each rib is in a round-head conical shape with the small top and the large bottom; when the pressure of the cabin body and the external pressure is balanced, the ribs support the diaphragm;
the shape of the cutter head is a flat-head cone with four arc grooves on the conical surface;
the overpressure relief device of the diaphragm type internal pressure cabin adopts a positive arch common conical surface bracket type metal rupture disc structure, and the relevant calculation of the overpressure relief device is as follows:
safe discharge amount of the container: ws =2.83 × 10 -3 ρvd 2 ；
Rupture disk discharge area:
in the formula: w s -safe discharge of the vessel, kg/h; rho-density of gas at relief pressure, kg/m3; v-flow velocity in the vessel feed tube, m/s; d, the diameter of the feeding pipe of the container is mm; a, the discharge area of the rupture disk is mm2; c-gas characteristic coefficient; k' -the rated relief factor of the rupture disk; p b -the design burst pressure of the rupture disc, MPa; m-molar mass of gas, kg/kmol; t-gas temperature at inlet side of the bleed device, K; z-the compressibility of the gas;
test pressure:
and (4) stress checking:
in the formula: p is the design pressure, MPa; [ sigma ]]-allowable stress, MPa, of the material at the test temperature; [ sigma ] A] t -allowable stress, MPa, of the material at the design temperature; d i -cylinder inside diameter, mm; delta e -effective thickness of the cylinder, mm; sigma s -yield point, MPa, of the material at the test temperature; sigma 0.2 -0.2% yield strength, MPa, of the material at the test temperature; phi-weld joint coefficient; sigma T The calculated stress for the material at the design temperature.
2. The vent apparatus of claim 1, wherein the shielding mechanism comprises: a hemispherical shield, a shield frame, a shield ring; the shield frame and the shield ring are used as a support of the shield to play a supporting role.
3. The vent apparatus of claim 1, wherein the membrane is a circular metal sheet having a diameter greater than the diameter of the base, and wherein holes are formed near the periphery of the membrane to accommodate the bolt holes in the base, the thickness of the membrane being determined by the amount of internal pressure.
4. The vent apparatus of claim 1, wherein the lever is supported by a welded structure formed by the hold-down flange and the arcuate support.
5. The tapping device of claim 1 wherein holes are provided near the periphery of the hold-down flange for mating with the bolt holes on the base, the upper end of the bow support has adjustment holes for mating with the adjustment rods, and the adjustment holes have threaded sections; the middle part of the adjusting rod is provided with an adjusting thread matched with the screw hole section.
6. The vent apparatus of claim 1, wherein the shield is comprised of seven circular shield rings of unequal diameters assembled in a hemispherical shape and four pairs of half-circular shield frames welded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106906.3A CN112128440B (en) | 2020-10-16 | 2020-10-16 | Diaphragm type internal ballast overpressure relief device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106906.3A CN112128440B (en) | 2020-10-16 | 2020-10-16 | Diaphragm type internal ballast overpressure relief device |
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| Publication Number | Publication Date |
|---|---|
| CN112128440A CN112128440A (en) | 2020-12-25 |
| CN112128440B true CN112128440B (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011106906.3A Active CN112128440B (en) | 2020-10-16 | 2020-10-16 | Diaphragm type internal ballast overpressure relief device |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1019779A (en) * | 1911-03-16 | 1912-03-12 | Charles G Gaddis | Safety appliance for oil-tanks. |
| US3515309A (en) * | 1968-10-18 | 1970-06-02 | Atomic Energy Commission | Sensitive burst diaphragm for relief of overpressures |
| FR2192719A5 (en) * | 1972-07-11 | 1974-02-08 | Electricite De France | |
| DE2658225C2 (en) * | 1976-12-22 | 1982-10-28 | Kraftwerk Union AG, 4330 Mülheim | Safety fittings for pipelines and containers, preferably for emergency shutdown systems of nuclear reactors |
| FR2608720B1 (en) * | 1986-12-18 | 1989-03-03 | Electricite De France | MEMBRANE SAFETY DEVICE WITH ACTIVE UPSTREAM BLADE KNIFE |
| CN203686282U (en) * | 2014-01-24 | 2014-07-02 | 郑州广众科技发展有限公司 | Pneumatic membrane type pressure-relieving valve |
| CN206786087U (en) * | 2017-06-05 | 2017-12-22 | 安徽理工大学 | A kind of blasting piece device |
| CN208169632U (en) * | 2018-05-18 | 2018-11-30 | 英侨机械制造有限公司 | A kind of mandril control pressure type blasting piece device |
| CN211525625U (en) * | 2019-12-24 | 2020-09-18 | 徐州凯泰安全装备有限公司 | Low-pressure-difference safety blasting device |
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2020
- 2020-10-16 CN CN202011106906.3A patent/CN112128440B/en active Active
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