CN114750346A - Method for producing mutual inductor by epoxy resin pressure gel forming - Google Patents
Method for producing mutual inductor by epoxy resin pressure gel forming Download PDFInfo
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- CN114750346A CN114750346A CN202210428255.2A CN202210428255A CN114750346A CN 114750346 A CN114750346 A CN 114750346A CN 202210428255 A CN202210428255 A CN 202210428255A CN 114750346 A CN114750346 A CN 114750346A
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- epoxy resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/38—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of mutual inductor production, in particular to a method for producing a mutual inductor by epoxy resin pressure gel forming, which comprises the following steps: s1, respectively storing the epoxy resin, the curing agent and the filler; s2, respectively conveying the epoxy resin and the curing agent to two premixing tanks through a gear pump; s3, dividing the filler into two parts according to the mass proportion, and feeding the two parts into respective corresponding premixing tanks; s4, stirring in the first premixing tank and the second premixing tank to obtain a first mixed material and a second mixed material, pressurizing the first mixed material and the second mixed material through metering pumps, and simultaneously feeding the first mixed material and the second mixed material into a static mixer to form a final mixed castable; and S5, injecting the final mixed casting material into an APG mould, heating and curing the APG mould with a fixed mutual inductor body, demoulding after curing, sending into a tunnel furnace, and curing to obtain the final mixed casting material. The invention can realize the random use and the random access of the epoxy resin premix, and simultaneously improves the pressure gel forming effect by optimizing the post-curing method, the method is stable and efficient, and the obtained product has good consistency and quality.
Description
Technical Field
The invention relates to the technical field of mutual inductor production, in particular to a method for producing a mutual inductor by epoxy resin pressure gel forming.
Background
The epoxy resin is an excellent insulating material, has the characteristics of stable insulating property, high mechanical strength after curing and the like, and is widely applied to the production of medium and low voltage transformers. The epoxy resin pressure gelation process is a novel epoxy resin pouring process and has the advantages of short product curing time, less occupied mold and the like, but the existing epoxy resin pressure gelation process needs to put the uniformly mixed epoxy resin and curing agent mixture into an independent pressure tank and then butt-joint the pressure tank to an APG mold to realize material injection pouring. In order to avoid repeated turnover, the mixture of 3-5 transformers can be stored in the pressure tank at each time, the epoxy resin and the curing agent are always reacted in the mixture in the pouring process, so that the viscosity, the curing degree and other characteristics of the mixture are changed consistently, and the quality consistency of the transformers is poor. Meanwhile, in order to prevent the shortage of the casting material, a plurality of mixture materials are stored in the pressure tank each time, so that the mixture materials are wasted. The mix is also difficult to clean after it has solidified in the pressure tank.
In production, in order to release the pressure generated by shrinkage in the process of curing the mixture, the product cured in the APG mould needs to be subjected to long-time high-temperature secondary curing after being demoulded. The pressure gel process is adopted to produce the mutual inductor, and the demoulding of one product can be finished every 0.5-1.5 hours. In order to reduce energy consumption, the currently commonly adopted electric furnace solidification can intensively solidify products subjected to APG demoulding within a period of time and then reduce the temperature along with the furnace. Resulting in a prolonged secondary curing time and loss of the advantages of the pressure gelation process. And the energy consumption is increased due to the prolonged curing time.
Disclosure of Invention
Aiming at the problems that the forming process in the prior art affects the quality of a transformer product and the like, the invention provides the method for producing the transformer by epoxy resin pressure gel forming, which can realize the random use and the random access of the epoxy resin premix, simultaneously shorten the post-curing time and improve the pressure gel forming effect by optimizing the post-curing method, and has the advantages of stability, high efficiency and good consistency and quality of the obtained product.
The invention provides a method for producing a mutual inductor by epoxy resin pressure gel forming, which comprises the following steps:
s1, respectively storing the epoxy resin, the curing agent and the filler in a first container, a second container and a third container;
s2, conveying the epoxy resin and the curing agent to a first premixing tank and a second premixing tank through a gear pump respectively;
s3, dividing the filler into two parts according to the mass ratio, wherein one part is conveyed into a first premixing tank, and the other part is conveyed into a second premixing tank;
s4, stirring the mixture in the first premixing tank and the second premixing tank by adopting a film degassing device to obtain a first mixture and a second mixture, pressurizing the first mixture and the second mixture by using metering pumps, and simultaneously feeding the first mixture and the second mixture into a static mixer to form a final mixed castable;
and S5, injecting the final mixed casting material into an APG mold, heating and curing the APG mold with a fixed transformer body, demolding after curing, sending into a tunnel furnace, and curing to obtain the final mixed casting material.
Further, in step S1, the first container and the second container are IBC ton barrels, the ton barrels can be recycled, the cost is reduced, the pressure of the environmental-friendly disposal waste barrel is reduced, and the first container and the second container are respectively disposed on the corresponding fixing frames.
Furthermore, every mount bottom is equipped with the storage vat that has heating element, and two storage vats are connected its IBC ton barrel bottom interface that corresponds through quick-operation joint respectively, and aim at can guarantee the mobility of epoxy and curing agent when temperature is low through the heating to storing the material.
Further, in step S1, the third container is a ton bag, a hanging strip is provided on the top of the ton bag, and an opening is provided on the bottom of the ton bag.
Further, in step S3, the filler is first dried in the silicon powder drying tank and then transported to the first premix tank and the second premix tank.
Further, in step S4, the pressurized discharge pressure of the metering pump is greater than 2MPa, and the metering pump feeds 2-5 kg per stroke.
Further, in step S5, when the number of the APG molds is one, the final mixed castable is directly injected into the APG mold; when the number of the APG moulds is more than 1, each APG mould is correspondingly provided with one material injection tank, the final mixing castable is firstly injected into the material injection tanks, and then the final mixing castable is pressurized and injected into the corresponding APG moulds through metering pumps.
Furthermore, the tunnel furnace curing process is that a transition area, a curing area and a cooling area are arranged from the time when a demoulded product enters the furnace after the tunnel furnace, the curing area is heated at a constant temperature, and heat insulation doors are arranged between the transition area and the curing area and between the curing area and the cooling area.
The invention has the beneficial effects that the mixing mode of the epoxy resin and the curing agent is optimized, the raw materials are separately stored and then mixed, the random use and the random taking of the mixed material are realized, the influence of the reaction between the materials in the pressure tank on the quality consistency of the prepared mutual inductor product in the pressure pouring process in the prior art is prevented, and meanwhile, the post-curing process of the demoulded product is optimized, the post-curing time is shortened, the pressure gel forming performance is improved, and the product quality is improved.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a process flow diagram of example 1 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the method for producing a transformer by epoxy resin pressure gel molding according to the present invention comprises the following steps:
(1) the epoxy resin and the curing agent are adopted in a standard IBC (intermediate bulk Container) ton bucket, the ton bucket can be recycled, the cost is reduced, the pressure of an environment-friendly waste treatment bucket is reduced, the epoxy resin and the curing agent are placed on a fixing frame, a storage bucket with heating is arranged at the bottom of the fixing frame, a special quick connector is arranged on the storage bucket and is in butt joint with an interface at the bottom of the IBC ton bucket, and the flowability of the epoxy resin and the curing agent can be ensured when the air temperature is low;
(2) epoxy resin and a curing agent respectively enter corresponding premixing tanks through gear pumps, and a flow meter is arranged on a feeding pipeline to be used for feeding measurement;
(3) The packing is packaged by ton, a hoisting belt is arranged at the top, an opening is formed at the bottom, the packing is hoisted to the upper part of a storage tank, the opening at the bottom is untied, the silicon powder enters the storage tank, the material is conveyed to a silicon powder drying tank in a vacuum mode, the silicon powder drying tank is arranged at the upper part of a premixing tank for epoxy resin and curing agent and is provided with an electronic scale for metering, and the dried silicon powder respectively enters the premixing tank for epoxy resin and curing agent according to the proportion;
(4) the epoxy resin and curing agent premixing tank is stirred by a film degassing device, is fully mixed with filler, is degassed and then enters into respective corresponding metering pumps, the metering pumps pressurize to enable the epoxy resin mixture and the curing agent mixture to simultaneously enter into a static mixer, a final mixing castable is formed after mixing, the metering pumps control the proportion of the epoxy resin and the curing agent through up and down strokes, the metering pumps are controlled by servo motors, the discharging pressure can reach more than 2mpa, 3kg of material is fed for each stroke of the metering pumps, and a one-way valve is arranged at the rear end of the static mixer, so that the castable can only be fed to the rear end and cannot return from the front end;
(5) the mould curing system is provided with a plurality of sets of APG moulds, each APG mould is correspondingly provided with a material injection tank after a static mixer, the material injection tank is of a simple metering pump structure, the internal space of the initial state is 0, the pouring material enters the material injection tank and then jacks up a metering pump plug to keep the internal vacuum state, the metering pump of the material injection tank is pressurized after the material injection is finished, the pouring material is injected into the APG mould through a one-way valve at the rear end of the metering pump, the pouring material in the APG mould is pressurized through the metering pump after the material injection process is finished, the pressure is kept through the one-way valve, a fixed mutual inductor body is arranged in the APG mould, and the mould is heated on APG equipment to cure the mixed material; the solidified mutual inductor casting body is separated from the APG mould and then enters the post-curing tunnel furnace for curing, the post-curing tunnel furnace adopts a chain to drive a supporting plate to automatically transmit in advance, waiting is not needed, the casting body can be immediately molded and post-cured after being demoulded, meanwhile, each discharged product independently enters the tunnel furnace to start curing, batch collection is not needed, continuous production is realized, and a transition region, a curing region and a cooling region are arranged in the tunnel furnace from the beginning of furnace entrance. When the product enters the tunnel furnace, the inlet of the transition area is opened, and the transition area and the curing area are closed, so that the internal temperature loss is prevented when the tunnel furnace door is frequently opened and closed. The solidification area only needs to keep constant temperature, so that the power consumption is greatly reduced, the cooling area and the solidification area are separated by a heat insulation door, high-temperature air naturally enters the cooling area when a product passes through the heat insulation door every time, the temperature of the cooling area is ensured to be reduced from the solidification area to the outlet temperature of the tunnel furnace in sequence, the requirement of solidification of the mutual inductor is met, the mutual inductor is ensured to be slowly cooled, and the solidification forming quality is improved.
According to the invention, by optimizing the mixing mode of the epoxy resin and the curing agent, the raw materials are separately stored and then mixed, so that the mixture can be taken at any time, the influence of the reaction between the materials in the pressure tank on the quality consistency of the prepared mutual inductor product in the pressure casting process in the prior art is prevented, and meanwhile, the post-curing process of the demoulded product is optimized, the post-curing time is shortened, the pressure gel forming performance is improved, and the product quality is improved.
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. The method for producing the mutual inductor by epoxy resin pressure gel molding is characterized by comprising the following steps of:
s1, respectively storing the epoxy resin, the curing agent and the filler in a first container, a second container and a third container;
S2, conveying the epoxy resin and the curing agent to a first premixing tank and a second premixing tank through a gear pump respectively;
s3, dividing the filler into two parts according to the mass ratio, wherein one part is conveyed into a first premixing tank, and the other part is conveyed into a second premixing tank;
s4, stirring the first premixing tank and the second premixing tank by adopting a film degassing device to obtain a first mixed material and a second mixed material, pressurizing the first mixed material and the second mixed material by a metering pump respectively, and simultaneously feeding the first mixed material and the second mixed material into a static mixer to form a final mixed castable material;
and S5, injecting the final mixed casting material into an APG mould, heating and curing the APG mould with a fixed mutual inductor body, demoulding after curing, sending into a tunnel furnace, and curing to obtain the final mixed casting material.
2. The method for manufacturing a transformer according to claim 1, wherein in step S1, the first container and the second container are IBC ton barrels, and the first container and the second container are respectively disposed on their corresponding holders.
3. The method for producing the mutual inductor by epoxy resin pressure gel forming as claimed in claim 2, wherein each fixing frame is provided with a storage barrel with a heating assembly at the bottom, and the two storage barrels are respectively connected with the bottom interfaces of the IBC ton barrels through quick connectors.
4. The method for manufacturing the instrument transformer by epoxy resin pressure gel molding according to claim 1, wherein in step S1, the third container is a ton bag, the top of the ton bag is provided with a hanging strip, and the bottom of the ton bag is provided with an opening.
5. The method for manufacturing a transformer by epoxy resin pressure gel molding according to claim 1, wherein in step S3, the filler is first dried in a silica powder drying tank and then transported to the first premixing tank and the second premixing tank.
6. The method for producing a transformer by epoxy resin pressure gel molding according to claim 1, wherein in step S4, the pressure of the discharge material pressurized by the metering pump is greater than 2MPa, and the metering pump feeds 2 to 5kg per stroke.
7. The method for manufacturing a transformer by epoxy resin pressure gel molding according to claim 1, wherein in step S5, when the number of the APG molds is one, the final-mixed castable is directly injected into the APG molds; when the number of the APG moulds is more than 1, each APG mould is correspondingly provided with one material injection tank, the final mixing castable is firstly injected into the material injection tanks, and then the final mixing castable is pressurized and injected into the corresponding APG moulds through metering pumps.
8. The method for manufacturing a transformer by epoxy resin pressure gel molding according to claim 1, wherein the tunnel furnace is post-cured by providing a transition zone, a curing zone and a cooling zone from the start of the feeding of the demolded product into the tunnel furnace, the curing zone is heated at a constant temperature, and heat-insulating doors are provided between the transition zone and the curing zone and between the curing zone and the cooling zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210428255.2A CN114750346A (en) | 2022-04-22 | 2022-04-22 | Method for producing mutual inductor by epoxy resin pressure gel forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210428255.2A CN114750346A (en) | 2022-04-22 | 2022-04-22 | Method for producing mutual inductor by epoxy resin pressure gel forming |
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| CN114750346A true CN114750346A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210428255.2A Pending CN114750346A (en) | 2022-04-22 | 2022-04-22 | Method for producing mutual inductor by epoxy resin pressure gel forming |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980069299A (en) * | 1997-02-27 | 1998-10-26 | 이종훈 | Suspension insulator for epoxy casting resin distribution and molding method |
| CN101872678A (en) * | 2010-06-17 | 2010-10-27 | 福建山亚开关有限公司 | Process of producing electrical product through pressure gelation of epoxy resin |
| CN105219022A (en) * | 2015-09-12 | 2016-01-06 | 安徽互感器有限公司 | A kind of indoor voltage transformer of macrostructure and casting process thereof |
| CN205853145U (en) * | 2016-07-12 | 2017-01-04 | 西安交通大学 | A kind of skid-mounted type vacuum pouring mixing device |
| CN106626181A (en) * | 2016-11-30 | 2017-05-10 | 国网重庆市电力公司电力科学研究院 | Pouring technology for all-fiber optical current transformer |
| CN207097656U (en) * | 2017-07-12 | 2018-03-13 | 湖北新天成电气有限公司 | A kind of transformer intelligent running gate system |
| CN212806484U (en) * | 2020-06-10 | 2021-03-26 | 合肥日新高温技术有限公司 | RTL-340/450-12 tunnel type circulating push plate activation furnace |
-
2022
- 2022-04-22 CN CN202210428255.2A patent/CN114750346A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980069299A (en) * | 1997-02-27 | 1998-10-26 | 이종훈 | Suspension insulator for epoxy casting resin distribution and molding method |
| CN101872678A (en) * | 2010-06-17 | 2010-10-27 | 福建山亚开关有限公司 | Process of producing electrical product through pressure gelation of epoxy resin |
| CN105219022A (en) * | 2015-09-12 | 2016-01-06 | 安徽互感器有限公司 | A kind of indoor voltage transformer of macrostructure and casting process thereof |
| CN205853145U (en) * | 2016-07-12 | 2017-01-04 | 西安交通大学 | A kind of skid-mounted type vacuum pouring mixing device |
| CN106626181A (en) * | 2016-11-30 | 2017-05-10 | 国网重庆市电力公司电力科学研究院 | Pouring technology for all-fiber optical current transformer |
| CN207097656U (en) * | 2017-07-12 | 2018-03-13 | 湖北新天成电气有限公司 | A kind of transformer intelligent running gate system |
| CN212806484U (en) * | 2020-06-10 | 2021-03-26 | 合肥日新高温技术有限公司 | RTL-340/450-12 tunnel type circulating push plate activation furnace |
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