CN104458098A - Method for solving insufficient pressure response at differential pressure diaphragm capsule high-pressure side - Google Patents
Method for solving insufficient pressure response at differential pressure diaphragm capsule high-pressure side Download PDFInfo
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- CN104458098A CN104458098A CN201310416655.2A CN201310416655A CN104458098A CN 104458098 A CN104458098 A CN 104458098A CN 201310416655 A CN201310416655 A CN 201310416655A CN 104458098 A CN104458098 A CN 104458098A
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Abstract
The invention discloses a method for solving insufficient pressure response at a differential pressure diaphragm capsule high-pressure side. The method comprises steps that, blanking, molding, trimming, solid solution treatment and deposition hardening treatment are carried. The method is characterized in that, deposition hardening treatment on a raw material is reduced, so cost of the raw material is saved; solid solution treatment and deposition hardening treatment on a center diaphragm after trimming are added, so flatness of the center diaphragm is improved, and stress concentration in a stamping molding process and initial offset of the diaphragm center are avoided. Through the method, the temperature compensating qualified rate is greatly improved, a problem of insufficient pressure response at the differential pressure diaphragm capsule high-pressure side is solved, and output and efficiency are improved.
Description
Technical field
The present invention relates to a kind of differential capsule, particularly a kind of method solving differential capsule high side pressure response deficiency.
Background technology
Differential capsule is Application comparison a kind of measuring element widely in field of industrial automation control, is particularly common in hydrodynamic pressure, differential pressure, flow, the isoparametric fields of measurement of liquid level.Differential capsule is divided into high-pressure side and low-pressure side by center diaphragm, and both sides all charge silicone oil to transmit the pressure of both sides measured medium respectively, and both sides silicone oil is isolated by isolation diaphragm and measured medium.Isolation diaphragm and center diaphragm acting in conjunction protection differential pressure pick-up can not damage because of measured medium overvoltage.But if the silicone oil between any side isolation diaphragm and bellows body is not enough, bellows will be caused to shift to an earlier date overvoltage protection, sensor cannot be expired width and be exported.The oil-filled mode of this differential capsule adopts the mode of simulation overvoltage protection process; namely time oil-filled, pressure is delivered to by silicone oil and center diaphragm promotes it produces displacement; silicone oil also thus fill center diaphragm displacement the volume that increases newly; and now isolation diaphragm is close to bellows because outside pressure is greater than silicone oil pressure, silicone oil cannot enter inside isolation diaphragm.After charging hole sealing; release barrier film outside pressure, center diaphragm gets back to free state, and unnecessary silicone oil flows into inside barrier film and makes to form the space that can hold it between barrier film and bellows body; this space corresponds to the overpressure protection pressure of bellows, also namely silicone oil charge pressure.When charging, be obstructed if center mambrane tension becomes large or mobile, so its displacement the volume reducing that increases newly, between final barrier film and bellows body, silicone oil reduces.If center diaphragm moves be obstructed completely, so finally will without silicone oil between barrier film and bellows body.Measured medium pressure will be obstructed when being delivered to bellows inside, and particularly during low temperature, silicone oil contraction can make problem more serious.For the problem that the response of differential capsule high side pressure is not enough, find with test after deliberation, due to the structure of self and the reason of moulding process, the initial center of center diaphragm is partial to minus side all the time, positive side rigidity is larger, and also may touch bellows minus side when assembly welding, and then when causing positive side to be pressurizeed, displacement is obstructed.Therefore, the initial center of the problem Shi Shi center diaphragm that solve is without skew.Finally, center diaphragm is put into after special tooling heat-treats by we, and initial offset is eliminated all, and the problem that the response of bellows high side pressure is not enough also thoroughly solves.
Summary of the invention
In order to overcome existing differential capsule center diaphragm initial center deflection minus side, high side pressure is caused to respond not enough problem, a kind of process of solution is provided, the method can eliminate the initial offset of center diaphragm, eliminate the problem that the response of differential capsule high side pressure is not enough, temperature compensation qualification rate obtains larger raising.
Technical scheme of the present invention: solve the method that the response of differential capsule high side pressure is not enough, it comprises the following steps:
(1) blanking: center diaphragm band delivers to blanker by conveying equipment, blanker presses the circular thin slice of different size blanking.
(2) shaping: to carry out shaping blanking thin rounded flakes, by certain Waveform shaping diaphragm by the upper and lower core rod of shaping mould.
(3) trimming: the diaphragm of forming is carried out trimming by certain external diameter by bead cutter, is exactly the central mode chip size needed after trimming, selects different edgers according to different size.
(4) solution treatment: the central mode sheet of trimming for forming is loaded in special fixture of heat treatment, thermal treatment is incubated 0.75 ± 0.25 hour at 1040 DEG C ± 15 DEG C, about 25 DEG C ± 6 DEG C/min of the rate of heat addition.Cooling stage uses the nitrogen being greater than 99.999% purity to make its air cooling, is cooled to less than 32 DEG C, about 36 DEG C ± 6 DEG C/min of cooldown rate.
(5) precipitation-hardening process: the center diaphragm after solution treatment is incubated 4 ± 0.25 hours at 552 DEG C ± 8 DEG C temperature, about 14 DEG C ± 6 DEG C/min of the rate of heat addition, furnace air from 24 DEG C (room temperatures) to 552 DEG C period its vacuum tightness be less than 0.13Pa.Cooling stage, uses the nitrogen being greater than 99.999% purity to make its air cooling, is cooled to less than 32 DEG C, about 11 DEG C ± 6 DEG C/min of cooldown rate.Check the hardness at least 3 places near diaphragm diameter, HRC35-43.
Compared with prior art, the invention has the beneficial effects as follows: decrease raw-material precipitation-hardening process, thus save raw-material expense; By solution treatment and precipitation-hardening process, the flatness of center diaphragm is improved, eliminate because the stress in impact briquetting process concentrates the initial offset with its center; Temperature compensation qualification rate improves greatly, thus solves the not enough problem of differential capsule high side pressure response, also makes output and efficiency be improved.
Accompanying drawing explanation
Fig. 1 is differential capsule structural representation
In figure, 1 is isolation diaphragm, and 2 is silicone oil, and 3 is low-pressure side, and 4 for charging hole, and 5 is high-pressure side, diaphragm centered by 6.
Embodiment
The method that described solution differential capsule high side pressure response is not enough, specific as follows:
(1) blanking: by starting material 100(width) × 0.3(thickness) stainless steel 630 band of specification, deliver on blanker by conveying equipment, the circular thin slice of blanking.
(2) shaping: with the thin rounded flakes after blanking above, to be shaped to the thin rounded flakes with certain waveform by the upper and lower core rod of shaping mould.
(3) trimming: the size trimming of the diaphragm of forming being pressed external diameter φ 51.74 is exactly the central mode chip size needed after trimming.
(4) solution treatment: the center diaphragm of trimming for forming is cleaned up in the special fixture of heat treatment of rear loading, its temperature is made to rise to 1040 DEG C from room temperature with the heating rate of 20 DEG C/min, be incubated 60 minutes, then make its Quick air be as cold as normal temperature with the cooldown rate of 40 DEG C/min, employ the nitrogen of 99.999% purity at cooling stage.
(5) precipitation-hardening process: the center diaphragm after solution treatment is risen to 550 DEG C with the rate of heat addition of 20 DEG C/min from room temperature, is incubated 4 hours, furnace air from room temperature to 550 DEG C period its vacuum tightness be less than 0.13Pa.Then make its Quick air be as cold as normal temperature with the cooldown rate of 15 DEG C/min, employ the nitrogen of 99.999% purity at cooling stage.
By above PROCESS FOR TREATMENT, near diaphragm diameter, detect 3 place's hardness, its hardness is HRC38, meets technological requirement.
It is emphasized that: be only preferred embodiments of the present invention above, not any pro forma restriction is done to the present invention, every above example is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. solve a method for the oil-filled quantity not sufficient of differential pressure pick-up bellows low-pressure side, it is characterized in that comprising the following steps:
(1) blanking: center diaphragm band delivers to blanker by conveying equipment, blanker presses the circular thin slice of different size blanking.
(2) shaping: to carry out shaping blanking thin rounded flakes, by certain Waveform shaping diaphragm by the upper and lower core rod of shaping mould.
(3) trimming: the diaphragm of forming is carried out trimming by certain external diameter by bead cutter is exactly the central mode needed after trimming
Chip size, selects different edgers according to different size.
(4) solution treatment: the central mode sheet of trimming for forming is loaded in special fixture of heat treatment, thermal treatment was 1040 DEG C ± 15 DEG C insulations 0.75 ± 0.25 hour, about 25 DEG C ± 6 DEG C/min of the rate of heat addition, cooling stage uses the nitrogen being greater than 99.999% purity to make its air cooling, be cooled to less than 32 DEG C, about 36 DEG C ± 6 DEG C/min of cooldown rate.
(5) precipitation-hardening process: the center diaphragm after solution treatment is incubated 4 ± 0.25 hours at 552 DEG C ± 8 DEG C temperature, about 14 DEG C ± 6 DEG C/min of the rate of heat addition, furnace air from 24 DEG C (room temperatures) to 552 DEG C period its vacuum tightness be less than 0.13Pa, cooling stage, the nitrogen being greater than 99.999% purity is used to make its air cooling, be cooled to less than 32 DEG C, about 11 DEG C ± 6 DEG C/min of cooldown rate.
2. a kind of method solving the oil-filled quantity not sufficient of differential pressure pick-up bellows low-pressure side according to claim 1 is: the hardness that near step (5) precipitation-hardening process rear film diameter, at least 3 places test is HRC35-43.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310416655.2A CN104458098A (en) | 2013-09-12 | 2013-09-12 | Method for solving insufficient pressure response at differential pressure diaphragm capsule high-pressure side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310416655.2A CN104458098A (en) | 2013-09-12 | 2013-09-12 | Method for solving insufficient pressure response at differential pressure diaphragm capsule high-pressure side |
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| CN104458098A true CN104458098A (en) | 2015-03-25 |
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| CN201310416655.2A Pending CN104458098A (en) | 2013-09-12 | 2013-09-12 | Method for solving insufficient pressure response at differential pressure diaphragm capsule high-pressure side |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7162926B1 (en) * | 2005-08-04 | 2007-01-16 | Kavlico Corporation | Lead embedded pressure sensor |
| CN101241031A (en) * | 2002-02-04 | 2008-08-13 | 德怀尔仪器公司 | Pressure sensor with a radially tensioned diaphragm |
| CN201322668Y (en) * | 2008-08-20 | 2009-10-07 | 上海皓鹰测控技术有限公司 | Pressure transmitter |
| CN102976319A (en) * | 2012-12-25 | 2013-03-20 | 宜昌新成石墨有限责任公司 | High-purity-graphite ultrathin membrane with high tensile strength and high thermal conductivity, and production equipment of membrane |
| CN203002952U (en) * | 2012-11-29 | 2013-06-19 | 上海航天设备制造总厂 | Precision forming die group for valve pressure diaphragm |
-
2013
- 2013-09-12 CN CN201310416655.2A patent/CN104458098A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241031A (en) * | 2002-02-04 | 2008-08-13 | 德怀尔仪器公司 | Pressure sensor with a radially tensioned diaphragm |
| US7162926B1 (en) * | 2005-08-04 | 2007-01-16 | Kavlico Corporation | Lead embedded pressure sensor |
| CN201322668Y (en) * | 2008-08-20 | 2009-10-07 | 上海皓鹰测控技术有限公司 | Pressure transmitter |
| CN203002952U (en) * | 2012-11-29 | 2013-06-19 | 上海航天设备制造总厂 | Precision forming die group for valve pressure diaphragm |
| CN102976319A (en) * | 2012-12-25 | 2013-03-20 | 宜昌新成石墨有限责任公司 | High-purity-graphite ultrathin membrane with high tensile strength and high thermal conductivity, and production equipment of membrane |
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Application publication date: 20150325 |
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