CN105931810A

CN105931810A - Power transformer

Info

Publication number: CN105931810A
Application number: CN201610507238.2A
Authority: CN
Inventors: 杨林娣
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-27
Filing date: 2016-06-27
Publication date: 2016-09-07

Abstract

The invention discloses a power transformer. The power transformer comprises a box body provided with an opening at the upper end, a cover body fixedly and hermetically connected to the upper end of the box body, an iron core fixedly arranged at the bottom in the box body and a winding component fixedly arranged on the iron core, wherein the winding component comprises a ceramic substrate, and three groups of high-voltage winding coils and three groups of low-voltage winding coils, which are integrally formed in the ceramic substrate; the ceramic substrate is prepared by a 3D printing method; after the ceramic substrate is sintered, liquid copper is injected into coil channels to form the winding coils. According to the power transformer, the processes for winding the coils and artificially molding the ceramic substrate are omitted, the machining precision is guaranteed, and the oil-immersed transformer is suitable for industrial mass production.

Description

A kind of power transformers

Technical field

The invention belongs to distribution transformer construction applications, be specifically related to a kind of three-phase transformer structure dispelling the heat good.

Background technology

The Chinese invention patent of Patent No. 201010169512.2 discloses a kind of fully-closed ceramic sintered dry-type transformer coil and preparation method thereof, and including conductor and insulator, it is characterized in that described conductor is

Bare conductor, insulator is pottery；The manufacture method of this fully-closed ceramic sintered dry-type transformer coil, uses following processing step: (one) coiling: be coiled into coil after bare conductor appearance topcoating glaze；(2) sealed loop: the turn-to-turn of coil, interlayer, intersegmental and coil surrounding are all encapsulated completely with pottery mud；And pottery mud or porcelain mud packed tightly coil be compacted into base substrate, it is coated with glaze；(3) it is fired into one: become pottery or porcelain by sintering or baking, and form an entirety with bare conductor.In a word, the invention has the beneficial effects as follows: insulation grade anti-corrosion is high, not producing harmful gas during high temperature, moistureproof water-resisting property is good, even if also can run during coil is discharged water, and service life is long.But the subject matter that the program exists is coil winding trouble, and step (two) needs to fully rely on manual operation, wastes time and energy and difficult quality guarantee, is unfavorable for industrialized mass production.

Number of patent application be 201510047881.7 Chinese patent application disclose a kind of 3D print solenoid method, design required coil three-dimensional mold file by computer aided design software；Tangible mold is printed by 3D printer；Inject the metal or metal alloy becoming liquid under room temperature, form conductive coil；Then metal connector is embedded entrance and the exit of mould, to provide the interface with external circuit, finally uses entrance and the exit of epoxy sealing coil.The present invention can design the structure of solenoid accurately and efficiently, without being limited by volume.Each step of present invention structure is all prone to streamlined production simultaneously, thus considerably reduces the time required for structure solenoid.But the program there is problems of using liquid metal cost high, and optional material is few, and resistance is relatively big, and when power is bigger, heating is serious, and the transformator not being suitable for power transformation class uses.

Summary of the invention

The technical problem to be solved is: the deficiency existed for prior art, it is provided that a kind of reasonable in design is novel, and good heat dissipation effect manufactures three-phase transformer structure easy to process.

For realizing the purpose of the present invention, it is achieved by the following technical solutions: a kind of power transformers, including the casing of upper end open, fixed seal connection is at the lid of casing upper end, the iron core being fixedly mounted on casing inner bottom part and the winding assembly being fixedly mounted on iron core；

Described iron core includes 3 longitudinally disposed stem stems and is connected to the horizontally disposed iron yoke of each stem stem upper and lower end parts；The iron yoke bottom connection being positioned at lower end on described iron core has base, base to be connected with casing inner bottom part；

Described winding assembly includes ceramic matrix and one-body molded 3 groups of high pressure winding coils in ceramic matrix and 3 groups of low pressure winding coils, along longitudinally forming 3 ports coordinated with stem stem on ceramic matrix, low pressure winding coil takes shape in the periphery of port, and high pressure winding coil is in the periphery of low pressure winding coil；One end of each high pressure winding coil is connected by high pressure winding connecting line, and one end of each low pressure winding coil is connected by low pressure winding connecting line, and low pressure winding connecting line connects the neutral conductor；The other end of each high pressure winding coil is respectively high pressure winding leading-out wire, the other end of each low pressure winding coil is respectively low pressure winding leading-out wire, 3 high-tension insulating bushings and 3 low-voltage insulation sleeve pipes it have been respectively fixedly connected with on described lid, each high pressure winding leading-out wire passes from high-tension insulating bushing, and each low pressure winding leading-out wire passes from low-voltage insulation sleeve pipe；

Form in described ceramic matrix in order to high pressure winding coil, low pressure winding coil, high pressure winding connecting line and the coil channel of low pressure winding connecting line described in molding, described ceramic matrix also forms in order to the lead-out wire formed pipe of high pressure winding leading-out wire, low pressure winding leading-out wire and the neutral conductor described in molding；At least 3 groups of cooling pipes are also formed in the position between high voltage winding group coil and low pressure winding coil in described ceramic matrix；

Described ceramic matrix is prepared by 3D Method of printing, comprises the following steps successively:

1) preparation includes low temperature bonding agent, middle temperature binding agent and the printed material granule of ceramics；By ceramics, low temperature bonding agent, middle temperature binding agent according to weight ratio it is: after the ratio uniform mixing of 92:7:1, be prefabricated into granule；Described ceramics is alumina ceramics, and described low temperature bonding agent is Tissuemat E, and described middle temperature binding agent is inorganic silicate；Described granule includes bulky grain and little granule, and bulky grain is 200 mesh, and little granule is 500 mesh, and bulky grain and short grained weight ratio are 2:7；

2) use 3D printing device based on heat of solution lamination method that described printed material is made base substrate；Carry out the coil channel in base substrate outer wall and base substrate and lead-out wire formed pipe soaking glaze；

3) upper step base substrate being carried out intermediate sintering temperature, sintering temperature is 500 DEG C, by the evaporation space formed between described granule, the low temperature bonding agent in evaporation base substrate, obtains once sintered part；

4) described once sintered part being carried out high temperature sintering, sintering temperature is 1300 DEG C, obtains ceramic matrix；

After ceramic matrix sinter molding, carry out the molding of winding coil:

1) keep kiln temperature at 1200 DEG C, in coil channel, be filled with nitrogen by lead-out wire formed pipe, then in coil channel, inject melted copper water from lead-out wire formed pipe, fill the outer end to all lead-out wire formed pipes to copper water；

2) lowering the temperature after winding coil molding, a 1st hour cooling rate controls at 5 DEG C per minute, cooling per minute in subsequent 2 hours 3 DEG C, cooling per minute of the lower time that connects 1 DEG C, after less than 200 DEG C, cooling per minute 3 DEG C, to kiln temperature less than 80 DEG C time kiln discharge；

The side of described ceramic matrix forms the oil-in and oil-out being connected with each group of cooling pipe respectively, and oil-in is near the lower end of ceramic matrix, and oil-out is near the upper end of ceramic matrix；

The bottom of described casing is fixedly connected with horizontally disposed support, and the side of described casing connects the multiple radiating tubes having longitudinally disposed entirety U-shaped；

Below described casing outside, both sides are separately installed with a horizontally disposed connecting tube；Described connecting tube one end is closed, and the other end connects oil pump；

Described radiating tube upper end is connected with casing, and lower end is connected with described connecting tube；

It is vertically arranged with on described radiating tube and organizes fin more, each described fin equidistant placement；

2 described oil pumps are respectively arranged on support, and the liquid outlet of described oil pump is connected with 3 oil-ins respectively by inflow pipeline, and the inlet of oil pump is connected with connecting tube；Described inflow pipeline through casing and is connected with box sealing；2 described oil pump parallel connections；

It is positioned at described radiating tube lower horizontal on described support and 6 radiator fans to up-draught are installed；

Described case is filled with transformer oil, and lid is arranged above conservator, and the liquid level of transformer oil is positioned at the inner top of conservator.

As preferably: described oil pump includes centrifugal pump shell, the impeller being rotatably installed in centrifugal pump shell, it is fixedly connected on the piston pump case of centrifugal pump shell one end, it is slidably mounted on the piston piece in piston pump case, and is fixedly connected on the motor in order to drive impeller and piston piece of the centrifugal pump shell other end；

Connecting on described motor has a link, described centrifugal pump shell outer wall integrally formed with union joint, to be connected by screw between described union joint and link；The sidewall of described centrifugal pump shell forms liquid outlet；

Connect on the output shaft of described motor and have a driving rotating disk, drive rotating disk close but do not contact one end of centrifugal pump shell, drive and on rotating disk, be fixedly connected with multiple drive magnet arranged with circumference array；

Described impeller includes impeller substrate, the multiple driven magnet corresponding with drive magnet position it is fixedly connected with on impeller substrate, on impeller substrate, the position between adjacent two driven magnet forms blade, away from one end of impeller substrate integrally formed with an annular driving circle between each blade, drive the upper one end away from blade of circle form 3 along hand of helix arrange driving inclined-plane, each drives the tip position on inclined-plane to be provided with and buffers Magnet a；

Described piston piece includes piston body, and piston body is connected by 3-4 connection post near one end of impeller a sliding bar coaxial with piston body, and the end of sliding bar connects a ratchet assembly, and ratchet assembly connects a piston STATEMENT OF FEDERALLY SPONSORED；Described piston STATEMENT OF FEDERALLY SPONSORED includes and outreaches moving-coil and fix the interior clamping ring being connected with ratchet assembly, and one connects and outreaches moving-coil and the dowel of interior clamping ring；Described outreaching 3 the driven inclined-planes forming on moving-coil with driving inclined-plane to match, the root position on driven inclined-plane is provided with the buffering Magnet b oppositely arranged with buffering Magnet a magnetic direction；

Described ratchet assembly includes the inner ring and outer ring being rotationally connected by bearing, and outer ring inwall forms ratchet, and inner ring is provided with the ratchet coordinated with ratchet；Described sliding bar is fixing with inner ring to be connected, and described piston STATEMENT OF FEDERALLY SPONSORED is connected with outer ring；Piston STATEMENT OF FEDERALLY SPONSORED is in rotary state with ratchet assembly when driving circle to rotate, and when piston STATEMENT OF FEDERALLY SPONSORED encloses relative slip with driving, ratchet assembly is in lockup state；

Being installed with a piston locating rack in described piston pump case, piston locating rack includes the outer ring body of inner ring body and polygonized structure, connects rib by 3-5 and be connected as a single entity between inner ring body and outer ring body；Non-cylindrical described sliding bar is slidably connected with inner ring body；

The end of described piston pump case connects a check valve, and on described piston body, the one end away from sliding bar forms spring utensil receiving opening, is provided with a spring between spring utensil receiving opening and check valve；

The intermediary form of described check valve has the bellmouth a of outer narrow inner width, and the outer end that check valve is positioned at bellmouth a forms a centring ring a, and the inner that check valve is positioned at bellmouth a is provided with a valve block backstop frame a；One valve block a is installed in described bellmouth a；Valve block a is permanent magnet, and centring ring a is pasted with the iron plate attracted with valve block a；

The intermediary form of described piston body has the bellmouth b of an outer narrow inner width, and the outer end that piston body is positioned at bellmouth b forms a centring ring b, and the inner that piston body is positioned at bellmouth b is provided with a valve block backstop frame b；One valve block b is installed in described bellmouth b；Valve block b is permanent magnet, and centring ring b is pasted with the iron plate that iron plate is attracted with valve block b.

Invention additionally discloses another kind of power transformers, it is characterised in that: including the casing of upper end open, fixed seal connection is at the lid of casing upper end, the iron core being fixedly mounted on casing inner bottom part and the winding assembly being fixedly mounted on iron core；

Described case is filled with transformer oil, and lid is arranged above conservator, and the liquid level of transformer oil is positioned at the inner top of conservator；

Described oil pump includes centrifugal pump shell, the impeller being rotatably installed in centrifugal pump shell, it is fixedly connected on the piston pump case of centrifugal pump shell one end, is slidably mounted on the piston piece in piston pump case, and is fixedly connected on the motor in order to drive impeller and piston piece of the centrifugal pump shell other end；

Compared with prior art, the invention has the beneficial effects as follows: the molding by the way of 3d prints of the ceramic matrix of the present invention, and directly directly forming winding coil toward injection copper water in coil channel while ceramic matrix has sintered, winding coil and ceramic matrix are cooled to become the winding coil of solid-state simultaneously.Compared with No. 201010169512.2 patents, eliminate coiling and manually ceramic matrix is carried out moulding process, and machining accuracy is more guaranteed, is suitable to industrialized mass production.Compared with No. 201510047881.7 patents, present invention employs new technique to enable 3d to print the winding assembly manufactured there is wider application field, additionally, transformator is cooled down by the oil pump driving transformer oil that present invention employs new structure, when transformer temperature is relatively low, transformer oil heat exchange amount is few, oil pump uses the working method driving transformer oil sluggish flow of piston pump can meet radiating requirements (when required flow rate is less, the working method of centrifugal pump relatively piston pump takes electricity)；Big compared with transformer oil heat exchange amount time high at transformer temperature, oil pump uses the working method of centrifugal pump, has saved electric energy on the whole.

Accompanying drawing explanation

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

Fig. 2 is the sectional structure schematic diagram of the present invention.

Fig. 3 is the body structure schematic diagram of the present invention.

Fig. 4 is the structural representation of iron core and winding assembly.

Fig. 5 is the structural representation of winding assembly.

Fig. 6 is the sectional structure schematic diagram of winding assembly.

Fig. 7 is the A portion schematic enlarged-scale view of Fig. 6.

Fig. 8 is the structural representation of ceramic matrix lead-out wire formed pipe part.

Fig. 9, Figure 10 are the structural representations of oil pump.

Figure 11 is the internal structure schematic diagram of oil pump.

Figure 12 is the decomposition texture schematic diagram of oil pump.

Figure 13 is impeller and the structural representation of piston STATEMENT OF FEDERALLY SPONSORED.

Figure 14 is the structural representation of piston STATEMENT OF FEDERALLY SPONSORED.

Figure 15 is the structural representation of piston piece.

Figure 16 is the structural representation of check valve.

1, casing；10, support；11, radiating tube；12, fin；13, connecting tube；2, lid；31, high-tension insulating bushing；32, low-voltage insulation sleeve pipe；4, conservator；5, winding assembly；50, ceramic matrix；51, high pressure winding leading-out wire；52, low pressure winding leading-out wire；53, oil-in；54, oil-out；55, high pressure winding coil；551, high pressure winding connecting line；56, low pressure winding coil；561, low pressure winding connecting line；57, cooling pipe；58, the neutral conductor；59, lead-out wire formed pipe；6, iron core；61, base；7, radiator fan；8, oil pump；80, ratchet assembly；81, motor；811, rotating disk is driven；812, link；813, drive magnet；82, centrifugal pump shell；821, liquid outlet；822, union joint；83, piston pump case；84, check valve；8401, bellmouth a；8402, centring ring a；841, valve block a；842, valve block backstop frame a；85, impeller；851, impeller substrate；852, driven magnet；853, blade；854, circle is driven；855, inclined-plane is driven；856, buffering Magnet a；86, piston STATEMENT OF FEDERALLY SPONSORED；861, moving-coil is outreached；862, driven inclined-plane；863, interior clamping ring；864, dowel；865, buffering Magnet b；87, piston locating rack；88, piston piece；881, piston body；8811, spring utensil receiving opening；8812, bellmouth b；8813, centring ring b；882, valve block b；883, valve block backstop frame b；884, post is connected；885, sliding bar；89；Spring.

Detailed description of the invention

According to shown in Fig. 1 to Fig. 8, the present embodiment is a kind of power transformers, includes the casing 1 of upper end open, and fixed seal connection is at the lid 2 of casing upper end, the iron core 6 being fixedly mounted on casing inner bottom part and the winding assembly 5 being fixedly mounted on iron core.

Described iron core includes 3 longitudinally disposed stem stems and is connected to the horizontally disposed iron yoke of each stem stem upper and lower end parts；The iron yoke bottom connection being positioned at lower end on described iron core has base 61, base to be connected with casing inner bottom part.

Described winding assembly includes ceramic matrix 50 and one-body molded 3 groups of high pressure winding coils 55 in ceramic matrix and 3 groups of low pressure winding coils 56, along longitudinally forming 3 ports coordinated with stem stem on ceramic matrix, low pressure winding coil takes shape in the periphery of port, and high pressure winding coil is in the periphery of low pressure winding coil；One end of each high pressure winding coil is connected by high pressure winding connecting line 551, and one end of each low pressure winding coil is connected by low pressure winding connecting line 561, and low pressure winding connecting line connects the neutral conductor 58；The other end of each high pressure winding coil is respectively high pressure winding leading-out wire 51, the other end of each low pressure winding coil is respectively low pressure winding leading-out wire 52,3 high-tension insulating bushings 31 and 3 low-voltage insulation sleeve pipes 32 it have been respectively fixedly connected with on described lid, each high pressure winding leading-out wire passes from high-tension insulating bushing, and each low pressure winding leading-out wire passes from low-voltage insulation sleeve pipe.

Form in described ceramic matrix in order to high pressure winding coil, low pressure winding coil, high pressure winding connecting line and the coil channel of low pressure winding connecting line described in molding, described ceramic matrix also forms in order to the lead-out wire formed pipe 59 of high pressure winding leading-out wire, low pressure winding leading-out wire and the neutral conductor described in molding；At least 3 groups of cooling pipes 57 are also formed in the position between high voltage winding group coil and low pressure winding coil in described ceramic matrix.

Described lead-out wire formed pipe uses break-in tool to be smashed dismounting after high pressure winding leading-out wire, low pressure winding leading-out wire, neutral conductor molding.

4) described once sintered part being carried out high temperature sintering, sintering temperature is 1300 DEG C, obtains ceramic matrix.

The manufacture method of above-mentioned ceramic matrix have employed the parameter of optimum, it is minimum that the volume making ceramic matrix compares base substrate degree of taper, little granule is oarse-grained about 3.5 times, so on the premise of guaranteeing that low temperature bonding agent can distil smoothly, guarantee hardness and the compactness of ceramic matrix to greatest extent.

After ceramic matrix sinter molding, carry out the molding of winding coil (including described high pressure winding coil and low pressure winding coil):

2) lowering the temperature after winding coil molding, a 1st hour cooling rate controls at 5 DEG C per minute, cooling per minute in subsequent 2 hours 3 DEG C, cooling per minute of the lower time that connects 1 DEG C, after less than 200 DEG C, cooling per minute 3 DEG C, to kiln temperature less than 80 DEG C time kiln discharge.

Described nitrogen is used for starvation, it is to avoid electric conductivity is impacted by the oxidation of copper water.Described winding coil is carried out after ceramic matrix sinter molding immediately, it is not necessary to additionally preheat ceramic matrix, saves the energy；And copper water and ceramic matrix cooling down simultaneously, and rate of cooling is through overtesting, have employed optimal parameter, it is to avoid ceramic matrix is different from the copper hydro-thermal coefficient of expansion and causes ceramic matrix the most damaged by excessive stresses.

The side of described ceramic matrix forms the oil-in 53 and oil-out 54 being connected with each group of cooling pipe respectively, and oil-in is near the lower end of ceramic matrix, and oil-out is near the upper end of ceramic matrix.

The bottom of described casing is fixedly connected with horizontally disposed support 10, and the side of described casing connects the multiple radiating tubes 11 having longitudinally disposed entirety U-shaped；

Below described casing outside, both sides are separately installed with a horizontally disposed connecting tube 13；Described connecting tube one end is closed, and the other end connects oil pump 8；

Many group fin 12, each described fin equidistant placement it is vertically arranged with on described radiating tube；

2 described oil pumps are respectively arranged on support, and the liquid outlet of described oil pump is connected with 3 oil-ins respectively by inflow pipeline, and the inlet of oil pump is connected with connecting tube；Described inflow pipeline through casing and is connected with box sealing；2 described oil pump parallel connections.

It is positioned at described radiating tube lower horizontal on described support and 6 radiator fans 7 to up-draught are installed.

Described case is filled with transformer oil, and lid is arranged above conservator 4, and the liquid level of transformer oil is positioned at the inner top of conservator.

Cooling pipe in described ceramic matrix can utilize transformer oil to be taken away by the heat that winding coil produces in time, it is ensured that transformator stable operation at a lower temperature.

Many groups fin of the equidistant placement installed on described radiating tube can be effectively increased the contact area of radiating tube and air, improves radiating efficiency, and the wind energy simultaneously upwards blown out by radiator fan is enough to be fully contacted with fin, optimizes radiating effect further；Additionally, described radiating tube lower end is connected with connecting tube, the transformer oil after heat radiation directly pumps into the cooling line within ceramic matrix by oil pump, and cooling-down effect is obvious.

Embodiment 2

The present embodiment is on the basis of embodiment 1, described oil pump is made improvement further, specifically: combine shown in Fig. 9 to Figure 16, described oil pump 8 includes centrifugal pump shell 82, the impeller 85 being rotatably installed in centrifugal pump shell, it is fixedly connected on the piston pump case 83 of centrifugal pump shell one end, the piston piece 88 being slidably mounted in piston pump case, and it is fixedly connected on the motor 81 in order to drive impeller and piston piece of the centrifugal pump shell other end.

Connecting on described motor has a link 812, described centrifugal pump shell outer wall integrally formed with union joint 822, to be connected by screw between described union joint and link；The sidewall of described centrifugal pump shell forms liquid outlet 821.

Connect on the output shaft of described motor and have a driving rotating disk 811, drive rotating disk close but do not contact one end of centrifugal pump shell, drive and on rotating disk, be fixedly connected with multiple drive magnet 813 arranged with circumference array.

Described impeller includes impeller substrate 851, the multiple driven magnet 852 corresponding with drive magnet position it is fixedly connected with on impeller substrate, on impeller substrate, the position between adjacent two driven magnet forms blade 853, away from one end of impeller substrate integrally formed with an annular driving circle 854 between each blade, drive the upper one end away from blade of circle form 3 along hand of helix arrange driving inclined-plane 855, each drives the tip position on inclined-plane to be provided with and buffers Magnet a856.

Described piston piece includes piston body 881, piston body is connected by 3-4 connection post 884 near one end of impeller a sliding bar 885 coaxial with piston body, the end of sliding bar connects a ratchet assembly 80, and ratchet assembly connects a piston STATEMENT OF FEDERALLY SPONSORED 86；Described piston STATEMENT OF FEDERALLY SPONSORED includes and outreaches moving-coil 861 and fix the interior clamping ring 863 being connected with ratchet assembly, and one connects the dowel 864 outreaching moving-coil and interior clamping ring；Described outreaching forms inclined-plane 862 driven with drive inclined-plane to match 3 on moving-coil, the root position on driven inclined-plane is provided with the buffering Magnet b865 oppositely arranged with buffering Magnet a magnetic direction.

Described ratchet assembly includes the inner ring and outer ring being rotationally connected by bearing, and outer ring inwall forms ratchet, and inner ring is provided with the ratchet coordinated with ratchet；Described sliding bar is fixing with inner ring to be connected, and described piston STATEMENT OF FEDERALLY SPONSORED is connected with outer ring；Piston STATEMENT OF FEDERALLY SPONSORED is in rotary state with ratchet assembly when driving circle to rotate, and when piston STATEMENT OF FEDERALLY SPONSORED encloses relative slip with driving, ratchet assembly is in lockup state.

Being installed with a piston locating rack 87 in described piston pump case 83, piston locating rack includes the outer ring body of inner ring body and polygonized structure, connects rib by 3-5 and be connected as a single entity between inner ring body and outer ring body；Non-cylindrical described sliding bar is slidably connected with inner ring body.

The end of described piston pump case connects a check valve 84, and on described piston body, the one end away from sliding bar forms spring utensil receiving opening, is provided with a spring 89 between spring utensil receiving opening and check valve.

The intermediary form of described check valve has the bellmouth a8401 of outer narrow inner width, and the outer end that check valve is positioned at bellmouth a forms a centring ring a8402, and the inner that check valve is positioned at bellmouth a is provided with a valve block backstop frame a842；One valve block a841 is installed in described bellmouth a；Valve block a is permanent magnet, and centring ring a is pasted with the iron plate attracted with valve block a.

The intermediary form of described piston body has the bellmouth b8812 of an outer narrow inner width, and the outer end that piston body is positioned at bellmouth b forms a centring ring b8813, and the inner that piston body is positioned at bellmouth b is provided with a valve block backstop frame b883；One valve block b882 is installed in described bellmouth b；Valve block b is permanent magnet, and centring ring b is pasted with the iron plate that iron plate is attracted with valve block b.

Being provided with temperature sensor, temperature sensor and oil pump on described ceramic matrix or casing and a control circuit plate connects, control circuit buttress is according to the working method of the signal control oil pump of temperature sensor.

Oil pump has two kinds of working methods, and when temperature is higher than switching temperature value, oil pump works in centrifugal pump mode, and when temperature is less than switching temperature value, oil pump works in piston pump mode.

Below the working method of oil pump is illustrated:

As shown in figure 11, when motor rotates counterclockwise, for piston pump working method, driving rotating disk to rotate drives drive magnet to rotate, and drive magnet drive installation has the impeller of driven magnet to rotate counterclockwise, and drives the driven inclined-plane in inclined-plane opposing pistons STATEMENT OF FEDERALLY SPONSORED that drives on circle to slide, now ratchet assembly does not rotates, thus drive piston STATEMENT OF FEDERALLY SPONSORED to move downward together with piston piece, now valve block b and centring ring b departs from, and transformer oil flows up；When driving inclined-plane to depart from driven inclined-plane, piston piece the most upwards resets, and now valve block b props up with centring ring b, and valve block a opens, and transformer oil enters the space between valve block a and valve block b.

Described buffering Magnet a and buffering Magnet b, by magnetic field repulsive force, makes driving inclined-plane and driven inclined-plane will not produce shock from disengaging during laminating again, is beneficial to ensure the service life of oil pump.

When motor rotates clockwise, working method for centrifugal pump, fit all the time with driving inclined-plane in the most driven inclined-plane, impeller drives piston STATEMENT OF FEDERALLY SPONSORED to rotate together with, now ratchet assembly is in the state of relatively rotating, valve block a and valve block b is constantly in disengaged position with centring ring a, centring ring b respectively, enables centrifugal pump to continue normally and works.

When transformer temperature is relatively low, transformer oil need not quickly flow, if now using the working method of centrifugal pump, more taking electricity, using piston pump working method, on the premise of reaching expection cooling-down effect, can save energy more than 20%.

Embodiment 3

According to Fig. 1, Fig. 2, Fig. 9 to Figure 16, the present embodiment is a kind of power transformers, including the casing 1 of upper end open, fixed seal connection is at the lid 2 of casing upper end, the iron core 6 being fixedly mounted on casing inner bottom part and the winding assembly 5 being fixedly mounted on iron core.

The bottom of described casing is fixedly connected with horizontally disposed support 10, and the side of described casing connects the multiple radiating tubes 11 having longitudinally disposed entirety U-shaped.

Below described casing outside, both sides are separately installed with a horizontally disposed connecting tube 13；Described connecting tube one end is closed, and the other end connects oil pump 8.

Described radiating tube upper end is connected with casing, and lower end is connected with described connecting tube.

It is vertically arranged with on described radiating tube and organizes fin more, each described fin equidistant placement.

Described oil pump 8 includes centrifugal pump shell 82, the impeller 85 being rotatably installed in centrifugal pump shell, it is fixedly connected on the piston pump case 83 of centrifugal pump shell one end, the piston piece 88 being slidably mounted in piston pump case, and it is fixedly connected on the motor 81 in order to drive impeller and piston piece of the centrifugal pump shell other end.

Being provided with temperature sensor, temperature sensor and oil pump on described casing and a control circuit plate connects, control circuit buttress is according to the working method of the signal control oil pump of temperature sensor.

Below the working method of oil pump is illustrated:

When transformer temperature is relatively low, transformer oil need not quickly flow, if now using the working method of centrifugal pump, more taking electricity, using piston pump working method, on the premise of reaching expection cooling-down effect, can save energy more than 10%.

Embodiment 4

The present embodiment is on the basis of embodiment 2, the working method of 2 described oil pumps is made further improvements, on described ceramic matrix or casing, temperature sensor is installed, temperature sensor and 2 oil pumps and a control circuit plate connect, and control circuit buttress is according to the working method of the signal control oil pump of temperature sensor.

Transformer oil is after dispelling the heat through radiating tube, and through cross over pipe by the cooling line within oil pump blowback ceramic matrix, 2 oil pump parallel connections form 2 groups of relatively independent cooling circuits；Control circuit plate controls 2 oil pump timesharing and is spaced to the cooling line fuel feeding within ceramic matrix.

Using 2 oil pump timesharing intervals to the working method of the cooling line fuel feeding within ceramic matrix, can effectively increase transformer oil and cool down duration in radiating tube, sufficiently cool transformer oil can improve the cooling circuit cooling-down effect to transformator.

Claims

1. a power transformers, it is characterised in that: including the casing of upper end open, fixed seal connection is at the lid of casing upper end, the iron core being fixedly mounted on casing inner bottom part and the winding assembly being fixedly mounted on iron core；

After ceramic matrix sinter molding, carry out the molding of winding coil:

2. a kind of power transformers as claimed in claim 1, it is characterized in that: described oil pump includes centrifugal pump shell, the impeller being rotatably installed in centrifugal pump shell, it is fixedly connected on the piston pump case of centrifugal pump shell one end, it is slidably mounted on the piston piece in piston pump case, and is fixedly connected on the motor in order to drive impeller and piston piece of the centrifugal pump shell other end；

3. a power transformers, it is characterised in that: including the casing of upper end open, fixed seal connection is at the lid of casing upper end, the iron core being fixedly mounted on casing inner bottom part and the winding assembly being fixedly mounted on iron core；