CN104317318A - Double-spring-tube type temperature compensation device in thermal bulb density controller - Google Patents
Double-spring-tube type temperature compensation device in thermal bulb density controller Download PDFInfo
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- CN104317318A CN104317318A CN201410542099.8A CN201410542099A CN104317318A CN 104317318 A CN104317318 A CN 104317318A CN 201410542099 A CN201410542099 A CN 201410542099A CN 104317318 A CN104317318 A CN 104317318A
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- density controller
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Abstract
Disclosed is a double-spring-tube type temperature compensation device in a thermal bulb density controller. The double-spring-tube type temperature compensation device is formed by a spring tube assembly; one of the spring tubes serves as a piezometer tube which is used for measuring the gas pressing in a measurement cabinet; the other spring tube serves as a compensation tube which is connected with an external thermal probe through a capillary tube and filled with thermal mediums. According to the double-spring-tube type temperature compensation device in the thermal bulb density controller, the environment temperature is felt by a thermal bulb probe, the volume of mediums in the probe are changed along with the temperature change, and accordingly the displacement of a free end of the compensation tube is produced, the compensation tube is connected with a free end of the piezometer tube to apply certain traction to the free end of the piezometer tube, and accordingly the measurement result of a measurement tube is changed.
Description
Technical field
The invention belongs to instrument and meter manufacturing technology field, be applied to the compensation way that temperature-sensitive packet mode density controller uses, this compensation way can be stablized, compensate reliably, and the temperature-sensing probe of satisfaction thermometer bulb formula density controller accurately finds out the change of air chamber temperature, makes and compensating accurately.
Background technology
High-voltage electrical equipment (as isolating switch, mutual inductor, the combined electrical apparatus etc.) overwhelming majority that in electrical network, high voltage grade transformer substation runs adopts sulfur hexafluoride gas as insulation arc-extinguishing medium, gas density in equipment air chamber directly affects the security of operation of equipment, therefore carries out monitoring to the gas density in operational outfit extremely important.
Current is SF for the device of sulfur hexafluoride gas density in monitoring substation high-voltage electrical equipment air chamber
6density controller, this density controller is all with temperature compensation function, its principle is the U-shaped heat-sensitive duplex metal element that gauge internal has temperature compensation function, and the distortion that element produces when variation of ambient temperature compensates pressure in the cabinet that caused by temperature and changes the change of the gauge pointer caused.Because this compensating element, is in gauge internal, therefore exist when place and chamber environment temperature difference that instrument is installed comparatively greatly or instrument causes that the morning and evening, the temperature difference was larger by direct sunlight time, the phenomenon of the false alarm caused.
The principle of work of temperature-sensitive packet mode density controller is that tested sulfur hexafluoride gas pressure converts the pipe end displacement of the lines be directly proportional to pressure to by instrument flexible member-bourdon tube, gear drive is passed to by the element of redeeming, gear drive is by displacement equations and convert angular displacement to, drive pointer rotates, thus completes pressure instruction.The element of redeeming produces with variation of ambient temperature and expands with heat and contract with cold, just in time can eliminate the equipment air chamber pressure that environment temperature causes when transfer tube end movement and change the displacement produced at instrument bourdon tube pipe end, thus reach temperature compensation function, the warning that the force value that instrument is indicated and contact export, pressure when locking force value is always in equipment air chamber 20 DEG C.
The compensation principle of current temperature-sensitive packet mode density controller mostly is bellows-type and compensates.Corrugated tube is as the element of temperature compensation, and linking springs pipe and gear drive fan tooth, and inside is filled with temperature sensing medium, and communicate with outside temperature-sensing probe.When the temperature is changed, interior media volume change causes corrugated tube to stretch, thus affects gear drive to rotate, and compensates because temperature variation causes chamber volume to change the amount of spin causing density controller pointer.But because corrugated tube is little, and welding part is more, high to welder's technical requirement when welding.And the parts of dual spring tubular type temperature-sensitive bag welding are few, and welding technology is simple, and leak detection easily.
Summary of the invention
The present invention seeks to design the dual spring tubular type temperature compensation means in a kind of temperature-sensitive bag density controller, to reduce existing compensation system number of components, and Simplified flowsheet.
Dual spring tubular type temperature compensation means in temperature-sensitive bag density controller, it is characterized in that adopting bourdon tube assembly to form, and one of them bourdon tube as piezometric tube for measuring gaseous tension in cabinet, another bourdon tube to be connected by kapillary as compensating pipe and outside temperature-sensing probe and inside is filled with temperature sensing medium.
Further, outside temperature-sensing probe communicates with inner temperature-sensing pipe, and temperature-sensing pipe one end is connected by sealing block with measuring tube, and the other end is connected with gear drive by sealing sleeve, pull bar.
Further, the volume of temperature-sensing probe and the volume ratio of compensating pipe are 4.
Further, kapillary communicates with temperature-sensing probe, communicates through joint, piezometric tube through watchcase with compensating pipe.
The compensation way of temperature-sensitive packet mode sulfur hexafluoride density controller of the present invention is dual spring tubular type, and its bourdon tube assembly bourdon tube, for measuring gaseous tension in cabinet, is called piezometric tube; Another bourdon tube is connected with outside temperature-sensing probe, inside be filled with temperature sensing medium, be called compensating pipe, when variation of ambient temperature time, temperature-sensitive detective head experiences environment temperature, and the changeable volume of the medium with thermal in probe changes, thus causes the displacement of compensating pipe free end, compensating pipe is connected with piezometric tube free end and namely can forms certain tractive force to piezometric tube free end, thus change the measurement result of measuring tube.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention,
Fig. 2 is Fig. 1 side view,
Fig. 3 is that the present invention installs and uses schematic diagram in instrument.
Embodiment
As shown in Figure 1-2, gauge internal of the present invention adopt two parameters the same and the bourdon tube that force value is identical as a pair use, one is piezometric tube, and one is compensating pipe.The volume of compensating pipe and the volume ratio of temperature-sensing probe very little, the medium with thermal guaranteeing in temperature-sensing probe changes the volume change caused and can be reflected on compensating pipe accurately.
Temperature-sensing probe communicates with inner temperature-sensing pipe, and temperature-sensing pipe one end is connected by sealing block with measuring tube, and the other end is connected with gear drive by sealing sleeve, pull bar.When the temperature of temperature-sensing probe detection changes, medium volume inside temperature-sensing probe can change along with the change of temperature, thus be reflected on compensating pipe, compensating pipe sealing sleeve end is moved, by the force value of medium in design probe, make the amount of movement of compensating pipe sealing sleeve end identical with the variable quantity of the density controller pointer that air chamber air pressure causes because of temperature variation, but direction is contrary, thus reaches temperature compensation accurately.
The core of this programme design has temperature-sensitive probe size to design design, the design of the wiring path of kapillary, compensating pipe and the conforming screening of piezometric pressure with compensating pipe volume ratio.
(1) design of temperature-sensing probe Volume design and compensating pipe volume ratio
The compensation principle of temperature-sensitive bag is the volume change that the change of the environment temperature that the medium in temperature-sensing probe is found out because of temperature-sensing probe causes, but the change of volume is smaller, compensating pipe to be transferred to through temperature-sensing probe, this is larger with regard to needing this volume change to compensating pipe, therefore just require that the volume of temperature-sensing probe is the bigger the better in the design process, compensating pipe is the smaller the better, but when in order to design feasible and attractive in appearance, through experimental verification, when the volume of temperature-sensing probe and the volume ratio of compensating pipe are 4, the compensation precision requirement of instrument can be met.
(2) design of the wiring path of kapillary
Kapillary connects temperature-sensing probe and compensating pipe, plays bridge beam action.As shown in Figure 2, kapillary communicates with temperature-sensing probe, communicates through joint, piezometric tube through watchcase with compensating pipe.The design of this wiring path can reduce compensating pipe and piezometric tube when action, the reacting force given because of kapillary and affect instrument numerical value.Kapillary requires good toughness in the design process, preferably adopts copper tube, and kapillary pipe diameter wants thin, both otherwise affect the activity of piezometric tube, and again can resistance to bending repeatedly.
(3) compensating pipe and the conforming screening of piezometric pressure
In order to better compensation, need compensating pipe consistent with the performance of piezometric tube, so when designing except want design compensation pipe and piezometric tube parameter unanimously except also need to ensure that the force value of compensating pipe and piezometric tube is the same, draw can match bourdon tube by check weighing through many experiments.
Feature of the present invention:
1) weld simple and convenient, not high to welding personnel technical requirement.
2) parts are few, and bourdon tube can be general, reduce amount of purchase.
3) temperature compensation is accurate, and consistance is good.
4) usable range is wide, not with the restriction of installation site.
When welding bourdon tube assembly, first by piezometric tube and soldering joint, kapillary, by joint, piezometric tube, then communicates with compensating pipe in piezometric tube out.Require that compensating pipe and piezometric tube centre can not UNICOM, kapillary can not communicate with piezometric tube.And the welding of sealing block place should seal but fill out tin can not be too much, to reduce the resistance of piezometric tube in motion process.Compensating pipe welds with sealing sleeve, ensures sealing.The kapillary other end is connected with temperature-sensing probe, is filled with medium after welding, ensures sealing.
Claims (4)
1. the dual spring tubular type temperature compensation means in temperature-sensitive bag density controller, it is characterized in that adopting bourdon tube assembly to form, and one of them bourdon tube as piezometric tube (1) for measuring gaseous tension in cabinet, another bourdon tube to be connected by kapillary (5) as compensating pipe (2) and outside temperature-sensing probe (10) and inside is filled with temperature sensing medium.
2. the dual spring tubular type temperature compensation means in temperature-sensitive bag density controller according to claim 1, it is characterized in that outside temperature-sensing probe (10) communicates with inner temperature-sensing pipe, temperature-sensing pipe one end is connected by sealing block (3) with measuring tube (1), and the other end is connected with gear drive (9) by sealing sleeve (4), pull bar (7).
3. the dual spring tubular type temperature compensation means in temperature-sensitive bag density controller according to claim 1, is characterized in that the volume of temperature-sensing probe and the volume ratio of compensating pipe (1) are 4.
4. the dual spring tubular type temperature compensation means in temperature-sensitive bag density controller according to claim 1, it is characterized in that kapillary (5) communicates with temperature-sensing probe (10), communicate with compensating pipe (2) through joint, piezometric tube (1) through watchcase (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410542099.8A CN104317318A (en) | 2014-10-14 | 2014-10-14 | Double-spring-tube type temperature compensation device in thermal bulb density controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410542099.8A CN104317318A (en) | 2014-10-14 | 2014-10-14 | Double-spring-tube type temperature compensation device in thermal bulb density controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104317318A true CN104317318A (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410542099.8A Pending CN104317318A (en) | 2014-10-14 | 2014-10-14 | Double-spring-tube type temperature compensation device in thermal bulb density controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225648A (en) * | 2018-01-12 | 2018-06-29 | 四川省泰禾机械有限公司 | A kind of spring tensioner assembling test equipment and its application method |
| CN110987724A (en) * | 2019-12-23 | 2020-04-10 | 朗松珂利(上海)仪器仪表有限公司 | Matching and testing method for density relay, spring tube and temperature compensation element |
-
2014
- 2014-10-14 CN CN201410542099.8A patent/CN104317318A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225648A (en) * | 2018-01-12 | 2018-06-29 | 四川省泰禾机械有限公司 | A kind of spring tensioner assembling test equipment and its application method |
| CN108225648B (en) * | 2018-01-12 | 2020-06-19 | 四川泰禾模具锻造有限责任公司 | Spring compensator assembling and testing equipment and using method thereof |
| CN110987724A (en) * | 2019-12-23 | 2020-04-10 | 朗松珂利(上海)仪器仪表有限公司 | Matching and testing method for density relay, spring tube and temperature compensation element |
| CN110987724B (en) * | 2019-12-23 | 2022-04-26 | 朗松珂利(上海)仪器仪表有限公司 | Matching and testing method for density relay, spring tube and temperature compensation element |
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Application publication date: 20150128 |