CN106735082A - A kind of explosion-proof oil conservater of oil-immersed current transformer and its casting equipment - Google Patents

Abstract

The present invention relates to a kind of explosion-proof oil conservater of oil-immersed current transformer and its casting equipment.Casting technique of the present invention selects resin self-setting sand type low-pressure casting process, qualified casting is improved, while being easy to design technology reinforcement；Product cavity designs two technique reinforcements, and it can cut off after heat treatment, to prevent casting from deforming and heat treatment deformation；It is located in same casting mold using monoblock type moulding, i.e. product, to ensure monnolithic case size casting accuracy；Product large flange is located at pouring position downside, the characteristics of filling type from bottom to top and solidify from top to bottom to be adapted to low-pressure casting process；Large flange inner side is uniformly distributed in using radial running gate system, i.e. ingate, cross gate radially symmetrical each ingate of covering, gate design cross gate center position, by meet low pressure casting centered on cast gate from as far as nearly solidification the characteristics of.

Description

A kind of explosion-proof oil conservater of oil-immersed current transformer and its casting equipment

Technical field

The present invention relates to the casting technique and equipment of a kind of oil conservater, and in particular to a kind of explosion-proof oil conservater of oil-immersed current transformer and its casting equipment.

Background technology

The current transformer of China is manufactured by the development and the effort of several generations researcher of over half a century, the manufacture of product from scratch, from copying to self-developing design, the introduction of technology and perfect, the manufacture level and manufacturing capacity of China's current transformer have been reached advanced world standards at present.

Current transformer is one of indispensable important electrical in power system power transmission and distribution project; it is responsible for the important task that metering and relay protection desired signal are provided for power system; difference according to cooling medium can be divided into oil immersed type, dry type, SF6 gas-insulateds etc., the invention mainly relates to oil-immersed current transformer.Oil-immersed current transformer is with insulating oil as heat eliminating medium, produced heat is transmitted to metal shell by insulating oil and is distributed during operation, with rapid heat dissipation, conduction be uniform, the recoverable feature of insulating properties, and product structure is simple, manufacture and operating experience are abundant, reliable, manufacturing cost is relatively low, electric property can meet the requirement of power system.Therefore, oil-immersed current transformer is widely used in high pressure, super-pressure and extra-high voltage electric power system.

Oil-immersed current transformer temperature classification is low, with inflammable, explosive and easily aging weakness, the drawbacks of also there is bad sealing property, leakage of oil, easily triggers current transformer power failure, when current transformer occurs accident, often cause large-area power-cuts, even lead to systematic failures, and current transformer once explodes, more entail dangers to surrounding devices, personal safety is threatened simultaneously, its consequence is typically catastrophic.Therefore, it is necessary to overcome leakage of oil, explosive and improve sealing property, to meet the requirement of electrical performance.

Oil conservater is the critical component of oil-immersed current transformer, Main Function is the insulating oil needed for storing and providing paper oil insulation, maintain dielectric level of the power system to current transformer during running, the quality of its explosion-proof, temperature classification and sealing property, to preventing current transformer explosion during accident, preventing into tide water inlet and the entrance of introduced contaminants, prevent from insulating oil from leaking with reducing oil consumption, extension device service life and adapt to upkeep operation and providing drawing oil sample or largely entering if necessary, drain the oil or the aspect such as a small amount of repairing is significant.

As shown in figure 1, being the oil conservater HT100 of certain oil-immersed current transformer, its alloy material is ZL101A, and appearance and size is：1050mm long, width 650mm, 600mm high, wall thickness is only 8mm, weight is only 40kg, belong to large thin-wall complex class product, oil conservater conventional fabrication processes use metal-mold low-pressure casting mostly, but because the small product size is big, lightweight, wall thickness is thin, using metal-mold low-pressure casting, yield rate is not high, low production efficiency, and the product compressive resistance produced is low, poor sealing performance, the requirement of power system can not be met, while product has casting deformation and heat treatment deformation, yield rate is considerably reduced.

Therefore, it is necessary to provide a kind of new casting technique and equipment, its product produced is set to have the advantages that explosion-proof, sealing property be high, high yield rate.

The content of the invention

It is an object of the invention to provide the casting technique and equipment of a kind of explosion-proof oil conservater of oil-immersed current transformer, its oil conservater produced has that explosion-proof, sealing property be high, anti-deformation, and production efficiency is high, high yield rate and the low technical characterstic of manufacturing cost.

To realize that the technical scheme that the purpose of the present invention is used is：The oil conservater of casting（HT100）Inner chamber design technology reinforcement（GJ201）、（GJ202）；

Oil Tank（HT100）Running gate system include 6 ingates（JN301~306）, cross gate（JH401）And cast gate（JZ501）, 6 ingates（JN301~306）It is uniformly distributed at large flange inwall, cross gate（JH401）End cover 6 ingates（JN301~306）, cast gate（JZ501）The stalk mouthful of lower end and air injection machine be connected, the other end and cross gate（JH401）Centre connection.

Oil Tank（HT100）Casting technique equip by exterior mold（WM600）, running gate system mould（DM700）And core mold（XM800）Composition；

Exterior mold（WM600）By external form apperance（WM601）, template（WM602）, alignment pin（WM603~605）Composition, external form apperance（WM601）For forming oil conservater（HT100）External form, template（WM602）It is exterior mold（WM600）Fixed base plate, alignment pin（WM603~605）For sandbox positioning, positioning when being assembled for external form sandbox and running gate system sandbox；

Running gate system mould（DM700）By template（DM701）, alignment pin（DM702~704）, core positioning seat（DM705）, cross gate apperance（DM706）, cast gate apperance（DM707）Composition；Template（DM701）It is running gate system mould（DM700）Fixed base plate, alignment pin（DM702~704）For sandbox positioning, positioning when being assembled for external form sandbox and running gate system sandbox, core positioning seat（DM705）For the positioning of core, cross gate apperance（DM706）For forming cross gate（JH401）, cast gate apperance（DM707）For forming cast gate（JZ501）；

Core mold（XM800）By left and right template（XM801）With（XM802）, inner chamber（XM803）, sand core head（XM804）, technique reinforcement apperance（XM805）With（XM806）, ingate apperance（XM807~812）Composition；Left and right template（XM801）With（XM802）It is core mold（XM800）Main body, sand core head（XM804）For the positioning of core, technique reinforcement apperance（XM805）With（XM806）For formation process reinforcement（GJ201）With（GJ202）, ingate apperance（XM807~812）For forming ingate（JN301~306）.

Oil Tank（HT100）Casting technique equipment sandbox by top box（SX901）, external form sandbox（SX902）, running gate system sandbox (SX903), core (SX904) composition；I.e. pourable product is positioned on air injection machine after sandbox assembling, and the cavity that sandbox is formed is full of aluminium liquid, obtains the blank of running gate system and product.

Casting technique of the present invention selects resin self-setting sand type low-pressure casting process, qualified casting is improved, while being easy to design technology reinforcement；Product cavity designs two technique reinforcements, and it can cut off after heat treatment, to prevent casting from deforming and heat treatment deformation；It is located in same casting mold using monoblock type moulding, i.e. product, to ensure monnolithic case size casting accuracy；Product large flange is located at pouring position downside, the characteristics of filling type from bottom to top and solidify from top to bottom to be adapted to low-pressure casting process；Large flange inner side is uniformly distributed in using radial running gate system, i.e. ingate, cross gate radially symmetrical each ingate of covering, gate design cross gate center position, by meet low pressure casting centered on cast gate from as far as nearly solidification the characteristics of.

Advantages of the present invention：1st, process is simple, easy to operate, production efficiency is high, low cost of manufacture；2nd, without deformation, casting flaw is few, and production yield rate is high for oil conservater；3rd, ne-leakage oil drawback, sealing property is high, reliable non-maintaining；4th, pressure-resistant performance is high, and breakdown pressure is explosion-proof and safe without hidden peril of explosion up to 40kgf/cm2, can ensure for the safe operation of power network provides effective technology.

Brief description of the drawings

Fig. 1 is the structural representation of oil conservater of the present invention.

Fig. 2 is the technique reinforcing rib structure schematic diagram of oil conservater of the present invention.

Fig. 3 is the running gate system process schematic representation of oil conservater of the present invention.

Fig. 4 is the exterior mold structural representation of oil conservater of the present invention.

Fig. 5 is the running gate system mould structure schematic diagram of oil conservater of the present invention.

Fig. 6 is the core mold structural representation of oil conservater of the present invention.

Fig. 7 is the sandbox assembling schematic diagram of oil conservater of the present invention.

Specific embodiment

The casting technique and device of explosion-proof oil conservater of the invention are described in further detail below in conjunction with accompanying drawing.

Embodiment one：

As shown in Figure 2, the blahk structure stereogram of oil conservater HT100 of the present invention, in order to the rough-cast for preventing oil conservater HT100 deforms and heat treatment deformation, two technique reinforcements GJ201 and GJ202 are designed in the inner chamber of oil conservater HT100, reinforcement GJ201 and GJ202 are directly cast in the inner chamber of Oil Tank HT100, reinforcement GJ201 and GJ202 cut off after heat treatment, can effectively prevent the rough-cast of Oil Tank HT100 from deforming and heat treatment deformation.

Embodiment two：

As shown in Figure 3, the injection system structure stereogram of Oil Tank HT100 of the present invention, casting technique of the present invention uses resin self-setting sand type low-pressure casting process, its running gate system includes 6 ingate JN301~306, cross gate JH401 and cast gate JZ501,6 ingate JN301~306 are uniformly distributed at large flange inwall, the end of cross gate JH401 covers 6 ingate JN301~306, the lower end of cast gate JZ501 is connected with the stalk mouthful of air injection machine, and the other end is connected with the centre of cross gate JH401.Aluminium liquid is under the pressure effect of low-pressure gas during low pressure casting：First by the stalk mouthful press-in cast gate JZ501 of air injection machine, cross gate JH401 is entered by cast gate JZ501 again, 6 ingate JN301~306 are entered by cross gate JH401 again, oil conservater HT100 and technique reinforcement GJ201,202 are filled finally by 6 ingate JN301~306, filling to oil conservater HT100, feeding and coagulation forming is realized.

Embodiment three：

The casting technique equipment of Oil Tank HT100 of the present invention is made up of exterior mold WM600, running gate system mould DM700 and core mold XM800, and its structural representation is respectively：Fig. 4, Fig. 5, Fig. 6.

As shown in figure 4, the exterior mold WM600 structural perspectives of the casting technique equipment of Oil Tank HT100 of the present invention, exterior mold WM600 is made up of external form apperance WM601, template WM602,3 alignment pin WM603~605.External form apperance WM601 is used to be formed the external form of oil conservater HT100, and template WM602 is the fixed base plate of exterior mold WM600, and 3 alignment pin WM603~605 position for sandbox, positioning when being assembled for external form sandbox and running gate system sandbox.

As shown in Figure 5, the running gate system mould DM700 structural perspectives of the casting technique equipment of Oil Tank HT100 of the present invention, running gate system mould DM700 is made up of template DM701,3 alignment pin DM702~704, core positioning seat DM705, cross gate apperance DM706, cast gate apperance DM707.Template DM701 is the fixed base plate of running gate system mould DM700,3 alignment pin DM702~704 position for sandbox, positioning when being assembled for external form sandbox and running gate system sandbox, core positioning seat DM705 is used for the positioning of core, cross gate apperance DM706 is used to form cross gate JH401, and cast gate apperance DM707 is used to form cast gate JZ501.

As shown in Figure 6, the core mold XM800 structural perspectives of the casting technique equipment of Oil Tank HT100 of the present invention, core mold XM800 is made up of left and right template XM801 and XM802, inner chamber XM803, sand core head XM804, technique reinforcement apperance XM805 and XM806, ingate apperance XM807~812.Left and right template XM801 and XM802 are the main bodys of core mold XM800, sand core head XM804 is used for the positioning of core, technique reinforcement apperance XM805 and XM806 are used for formation process reinforcement GJ201 and GJ202, and ingate apperance XM807~812 are used to form ingate JN301~306.

Example IV：

As shown in fig. 7, the assembling schematic diagram of the sandbox of the casting technique equipment of Oil Tank HT100 of the present invention, it is made up of top box SX901, external form sandbox SX902, running gate system sandbox SX903, core SX904.I.e. pourable product is positioned on air injection machine after sandbox assembling, and the cavity that sandbox is formed is full of aluminium liquid, obtains the blank of running gate system and product.

Claims (3)

1. a kind of explosion-proof oil conservater of oil-immersed current transformer, it is characterised in that the oil conservater of casting（HT100）Inner chamber design technology reinforcement（GJ201）、（GJ202）；

Oil Tank（HT100）Running gate system include 6 ingates（JN301~306）, cross gate（JH401）And cast gate（JZ501）, 6 ingates（JN301~306）It is uniformly distributed at large flange inwall, cross gate（JH401）End cover 6 ingates（JN301~306）, cast gate（JZ501）The stalk mouthful of lower end and air injection machine be connected, the other end and cross gate（JH401）Centre connection.

2. the casting of the explosion-proof oil conservater of a kind of oil-immersed current transformer is equipped, it is characterised in that

Oil Tank（HT100）Casting technique equip by exterior mold（WM600）, running gate system mould（DM700）And core mold（XM800）Composition；

Exterior mold（WM600）By external form apperance（WM601）, template（WM602）, alignment pin（WM603~605）Composition, external form apperance（WM601）For forming oil conservater（HT100）External form, template（WM602）It is exterior mold（WM600）Fixed base plate, alignment pin（WM603~605）For sandbox positioning, positioning when being assembled for external form sandbox and running gate system sandbox；

Running gate system mould（DM700）By template（DM701）, alignment pin（DM702~704）, core positioning seat（DM705）, cross gate apperance（DM706）, cast gate apperance（DM707）Composition；Template（DM701）It is running gate system mould（DM700）Fixed base plate, alignment pin（DM702~704）For sandbox positioning, positioning when being assembled for external form sandbox and running gate system sandbox, core positioning seat（DM705）For the positioning of core, cross gate apperance（DM706）For forming cross gate（JH401）, cast gate apperance（DM707）For forming cast gate（JZ501）；

Core mold（XM800）By left and right template（XM801）With（XM802）, inner chamber（XM803）, sand core head（XM804）, technique reinforcement apperance（XM805）With（XM806）, ingate apperance（XM807~812）Composition；Left and right template（XM801）With（XM802）It is core mold（XM800）Main body, sand core head（XM804）For the positioning of core, technique reinforcement apperance（XM805）With（XM806）For formation process reinforcement（GJ201）With（GJ202）, ingate apperance（XM807~812）For forming ingate（JN301~306）.

3. Oil Tank（HT100）Casting technique equipment sandbox by top box（SX901）, external form sandbox（SX902）, running gate system sandbox (SX903), core (SX904) composition；I.e. pourable product is positioned on air injection machine after sandbox assembling.