CN1288678C - Transformer with temperature detecting function and an electric equipment arranged with the transformer - Google Patents
Transformer with temperature detecting function and an electric equipment arranged with the transformer Download PDFInfo
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- CN1288678C CN1288678C CN 02122667 CN02122667A CN1288678C CN 1288678 C CN1288678 C CN 1288678C CN 02122667 CN02122667 CN 02122667 CN 02122667 A CN02122667 A CN 02122667A CN 1288678 C CN1288678 C CN 1288678C
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- transformer
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- former limit
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- thermoswitch
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Abstract
The present invention relates to a transformer with the function of temperature detection and an electric device which is provided with the transformer. Provided with an iron core with small size, the transformer can be miniaturized, and the temperature of the transformer can not exceed a rated value when anomalous condition occurs. The transformer comprises the iron core (18) and a thermoswitch (30) which separates a primary side winding (13) and a secondary side winding (14) which wind around the iron core (18), and are connected in series with the primary side winding (13) and are disconnected from the primary side winding (13) when the temperature is greater than a preset value, wherein the thermoswitch (30) is installed between the primary side winding (13) or the secondary side winding (14) and the iron core (18).
Description
Technical field
Transformer and the electric device that is provided with this transformer that temperature when the present invention relates to work is high.
Background technology
The high transformer of temperature during the work used in microwave oven etc. is usually by forcing cooling fan to cool off, the temperature upper limit during operate as normal and when cooling fan stops etc. the temperature upper limit unusually the time be prescribed.For example, the temperature upper limit when belonging to the operate as normal of transformer of European standard EI-96 is 200 ℃, and the temperature upper limit when unusual is 250 ℃.In the prior art, the temperature when using operate as normal is 180 ℃ of so larger-size iron cores, and making the temperature when unusual is below 250 ℃.Therefore, transformer become large-scale and weight big the time cost uprise.
On the other hand, for the excessive temperature that prevents transformer rises, Thermal Cutoffs is connected in series on the winding of former limit, when becoming design temperature when above, stops from the power supply of power supply to former limit winding, this is known.But the said temperature fuse is installed in the outside portion of former limit winding or secondary winding, therefore, can not accurately detect the temperature that transformer becomes the part of maximum temperature.
Maximum temperature portion in the transformer is considered to the cross section central part of winding, and the result of the research that the inventor carried out is: the part that becomes next high temperature is between the iron core of putting the low winding of cold effect and its inboard.Owing to can not insert transducer at the cross section of winding central part, the temperature that detects between winding and the iron core is only.
Above-mentioned cognition according to the inventor, the purpose of this invention is to provide a kind of transformer and be provided with the electric device of this transformer,, can reduce core dimensions and can realize miniaturization, lightweight by detecting the temperature between winding and the iron core, simultaneously, can not surpass temperature upper limit when unusual.
Summary of the invention
To achieve these goals, the related transformer of first invention comprises: iron core; Former limit winding and secondary winding on this iron core; Be connected with above-mentioned former limit windings in series, the thermoswitch that more than predetermined temperature, disconnects, above-mentioned former limit winding and secondary winding separate on axis direction, and above-mentioned thermoswitch is inserted between above-mentioned former limit winding or secondary winding and the iron core.
According to above-mentioned formation, between secondary winding that the thermoswitch detected temperatures is the highest and the iron core or the temperature between former limit winding and the iron core, when becoming predetermined temperature, disconnect the input of former limit winding.Therefore, the temperature rising of transformer is suppressed, thereby can reduces core dimensions, can realize the miniaturization and the lightweight of transformer integral body.And thermoswitch is sandwiched between secondary winding or former limit winding and the iron core and supports, and therefore, does not need other fixed part.
And, in a preferred embodiment of the invention, on iron core, former limit winding, secondary winding and thermoswitch, added the insulation more than pyroconductivity 0.25W/m ℃ with coating with lacquer.As described above, maximum temperature portion in the transformer is considered to the cross section central part of winding, but, according to above-mentioned formation, by the pyroconductivity good insulation performance lacquer that soaks in the inside of former limit winding and secondary winding, the heat efficiency highland and the partial deviations of the cross section central part of above-mentioned winding are transmitted on the surface of winding littlely.And by being filled in the pyroconductivity good insulation performance lacquer between thermoswitch and the winding, the heat on winding surface is transmitted on the thermoswitch expeditiously.Therefore, thermoswitch can detect the temperature of the maximum temperature that is in close proximity to transformer exactly by being provided with under the little state of partial deviations that the position produces of thermoswitch.And, owing to the heat conduction that has promoted between unshakable in one's determination and each winding, local temperature unshakable in one's determination is risen be suppressed, therefore, can further make miniaturization unshakable in one's determination.
And in a preferred embodiment of the invention, iron core is overlapping up and down second lamination of first lamination of E type and I type or E type, at the above-mentioned former limit winding of coiling on the center pillar and be positioned at coiling secondary winding above it.According to above-mentioned formation, the secondary winding that temperature is higher than former limit winding is positioned at the top of former limit winding, and therefore, the heat of secondary winding rises and produces harmful effect can not for former limit winding.Under this state, the inboard of the secondary winding that the thermoswitch detected temperatures is the highest and the temperature between the iron core.
And, in a preferred embodiment of the invention, terminal board with pair of terminal is installed on the winding of former limit, an end that on a side terminal, connects former limit winding, connect a side's of thermoswitch lead-in wire on the opposing party's terminal, the opposing party's of thermoswitch lead-in wire is connected on the other end of former limit winding.According to above-mentioned formation since on the winding of former limit the mounting terminal platform, the thermoswitch and the terminal board that are connected on the winding of former limit are approaching, therefore, the lead-in wire that is connected a side of the thermoswitch on the opposing party's the terminal board can shorten.
And in a preferred embodiment of the invention, the connecting portion of the other end of former limit winding and the opposing party's of thermoswitch lead-in wire is supported on the above-mentioned terminal board.According to above-mentioned formation, do not need to be used to support other terminal for connecting of above-mentioned connecting portion.
Electric device involved in the present invention, the transformer of above-mentioned band temperature detecting function, be received in the enclosure by the electric component that this transformer drove, the cooling fan of cooling transformer, the thermoswitch of above-mentioned transformer is configured on the part of a sidepiece opposite side that blows to cooling air from the above-mentioned cooling fan in the transformer.According to above-mentioned formation, cooling air can directly not blow on the other side that the thermoswitch of transformer installs, and therefore, the temperature of the part that thermoswitch disposed of transformer becomes the highest.
Description of drawings
In the accompanying drawings, identical parts label is represented same section among several figure.
Fig. 1 is the stereogram that the part of loam cake of the microwave oven of the related transformer of disrumpent feelings use one embodiment of the present of invention is represented internal configurations;
Fig. 2 is the exploded perspective view of the transformer of this embodiment;
Fig. 3 is the side view of the transformer of this embodiment;
Fig. 4 is the stereogram of seeing from the bottom surface side of the transformer of this embodiment;
Fig. 5 is the circuit diagram of drive circuit of magnetron of the microwave oven of the expression transformer that uses this embodiment.
Embodiment
One embodiment of the present of invention are described below with reference to the accompanying drawings.As shown in Figure 1, the shell 2 of microwave oven 1 is to have diapire 21, upper wall 22, pair of sidewalls 23 and rear wall 24, the box-shaped of the roughly cuboid of opening forwardly.The door 25 of opening the chamber is installed in the opening forwardly.Transformer 12 is installed on the diapire 21 of a sidepiece of above-mentioned shell 2, magnetron 16 is installed above transformer 12, cooling fan 3 is installed at the rear of transformer 12 and magnetron 16.Suck cooling air the air vent hole 23 of cooling fan 3 from the rear surface 22 that is formed on shell 2, blow on transformer 12 and the magnetron 16, the air vent hole of the cooling air of cooling transformer 12 from the not shown side of the rear wall 24 that is located at shell 2 is discharged to outside the shell 2.
As shown in Figure 2, the iron core 18 of transformer 12 is overlapping up and down and constitute the first lamination 18e and the second lamination 18i.The first lamination 18e is an E shape, has a pair of column jacket 18eo and center pillar 18ec.The second lamination 18i is an I shape, is fixed on the first lamination 18e, contacts with two column jacket 18eo, in unshakable in one's determination 18 assembling process, at first, insert the secondary winding 14 of coiling in advance, then, insert heater winding 17, then, insert the former limit winding 13 of coiling in advance.Former limit winding 13 covers the part of joining with E shape lamination 18e with insulating paper as required, and secondary winding 14 covers outer surface integral body with insulating paper as required.Like this, former limit winding 13, secondary winding 14 and heater winding 17 are spaced from each other on the axis direction of winding, from the below successively and row arrangement.On the lead-out wire 14e at the coiling top of secondary winding 14, connect circular terminal 14m, on the lead-out wire 14f of coiling tail end, connect flag terminal 14h.The coiling top of heater winding 17 and the lead-out wire 17e of coiling tail end connect flag terminal 17h1,17h2 respectively on the 17f.At this, so-called coiling top is meant the part that is wound at first on the winding core, and so-called coiling tail end is meant the part that derives from winding when coiling finishes.
On the bottom of a sidepiece of former limit winding 13, resinous terminal board 40 is installed by transparent insulating tape 50, in the inboard of former limit winding 13, pass first lead-in wire, 31 and second lead-in wire 32 of thermoswitch (hereinafter referred to as " automatic temperature regulator ") 30 from the recovery type.Automatic temperature regulator 30 is connected in series with former limit winding 13, and as shown in Figure 4, the end end of first lead-in wire 31 couples together by scolding tin with the end end of the lead-out wire 13e at the coiling top of former limit winding 13.Automatic temperature regulator 30 covers with insulating paper as required.
This connecting portion 35 is positioned on the lower surface of terminal board 40, reinstates insulating tape 50 with terminal board 40 1 and is fixed on the former limit winding 13.And connection connects the end end of first lead-in wire 31 of automatic temperature regulator 30 as the lead-out wire 13f of the coiling tail end of an end of former limit winding 13 on second terminal 42 on the first terminal 41 of terminal board 40.Be connected the circular terminal 14m on the lead-out wire 14e at coiling top of secondary winding 14, as shown in Figure 3, be installed among the bolt hole 18en that is formed on the E core sheet 18e, be connected with unshakable in one's determination 18 by bolt 18n.
When on the center pillar 18ec of E core sheet 18e shown in Figure 2, inserting above-mentioned former limit winding 13, make automatic temperature regulator 30 by between the inboard and center pillar 18ec of heater winding 17, and be inserted between the inboard and center pillar 18ec of secondary winding 14, the temperature detection face of automatic temperature regulator 30 positions so that be in secondary winding 14 inner surface top and contact with the substantial middle portion of left and right directions LR.Then, under the state on the lower surface of the two column jacket 18eo that I shape lamination 18i are crimped onto E core sheet 18e,, weld the sidepiece of the faying face of two laminations with arc welding by shown in Figure 3.18m is this weld part.Then, with spot welding with substrate 19 be welded on I shape lamination 18i below.Substrate 19 is installed on the diapire 21 of shell 2 by the such mounted apparatus of bolt that passes the installing hole 19a that has been formed on four jiaos.Like this, unshakable in one's determination 18 be grounding on the shell 2.
Like this Zhuan Pei transformer 12 by vacuum impregnation in pyroconductivity good insulation performance lacquer.On the surface of lacquer attached to iron core 18 and thermoswitch 30, be immersed in the inside of two windings 13,14.This insulating varnish is the lacquer that has added the micropowder of silicon dioxide in polyvinyl resin, with the pyroconductivity of common insulating varnish be 0.19W/m ℃ relative, its pyroconductivity is more than 0.25W/m ℃.As the high lacquer of this pyroconductivity, has the lacquer No.50S that THEP-D-GEORGE COMPANY makes.
Fig. 5 is the circuit diagram of drive circuit of magnetron of the microwave oven of the expression transformer 12 that uses this embodiment.In Fig. 5, to 13 power supplies of the former limit of transformer 12 winding, the output voltage of the secondary winding 14 of transformer 12 carries out the level and smooth dc high voltage of rectification by half-wave voltage doubler 15 and is provided for magnetron 16 source power supply 33 by automatic temperature regulator 30.Magnetron 16 drives heaters by the heater winding 17 of transformer 12, accepts the power supply of dc high voltage from half-wave voltage doubler 15, and microwave takes place.
As described above, separate the former limit of coiling winding 13 and secondary winding 14, coiling heater winding 17 between former limit winding 13 and secondary winding 14 at 18 upper edge axis directions unshakable in one's determination.The lead-out wire 13f of the coiling tail end of former limit winding 13 is connected on the first terminal 41 of terminal board 40, and first lead-in wire 31 of automatic temperature regulator 30 is connected on second terminal 42.The lead-out wire 13e at the coiling top of former limit winding 13 is connected on second lead-in wire 32 of automatic temperature regulator 30.Like this, automatic temperature regulator 30 is connected in series by two lead-in wires 31,32 and former limit winding 13, and, be inserted between secondary winding 14 and unshakable in one's determination 18.The lead-out wire 14e at the coiling top of secondary winding 14 is connected with unshakable in one's determination 18 by circular terminal 14m, and the lead-out wire 14f of coiling tail end is connected on the input of half-wave voltage doubler 15 by flag terminal 14h1.Two lead-out wire 17e of heater winding 17,17f are by the flag terminal 17h1 of end separately, 17h2 and being connected with the heater of magnetron 16.
In the above-described configuration, the temperature between the secondary winding 14 that automatic temperature regulator 30 detected temperatures are the highest and unshakable in one's determination 18 when becoming predetermined temperature, disconnects from the input of power supply 33 to former limit winding 13.Therefore, the temperature rising of transformer 12 is suppressed, therefore, can reduce core dimensions, therefore temperature during transformer 12 operate as normal and the temperature upper limit when unusual can, realize that miniaturization, lightweight and the cost of transformer 12 integral body reduces for below the rated value.And thermoswitch 30 can support between secondary winding 14 is inserted unshakable in one's determination 18, therefore, does not need other fixer.For example, in the transformer of EI-96 standard, when using, become disconnection, when in the time of 190 ℃, recovering the automatic temperature regulator 30 of connection at 200 ℃, when the temperature of the inner surface of secondary winding 14 becomes 200 ℃, power supply to former limit winding 13 becomes disconnection, and temperature rises and is suppressed, therefore, temperature during transformer 12 operate as normal can overrate 200 ℃, and, even stop at cooling fan 3 such when unusual, temperature can overrate yet 250 ℃.
And, the maximum temperature portion of transformer 12, the cross section central part C1 that is considered to secondary winding 14 in this embodiment, by soak into pyroconductivity to the inside of secondary winding is insulating varnish more than 0.25W/m ℃, the heat of above-mentioned cross section central part C1 efficiently and partial deviations be transmitted to the surface of secondary winding 14 littlely.And by the pyroconductivity good insulation performance lacquer of being filled between the aperture surface between thermoswitch 30 and the secondary winding 14, the heat of the aperture surface of secondary winding 14 is transmitted on the thermoswitch 30 efficiently.Therefore, thermoswitch 30 is in the temperature that detects the maximum temperature that is in close proximity to transformer 12 under the little state of partial deviations that the position produces exactly that is provided with of thermoswitch 30.
And, owing to the heat conduction between iron core 18 and each winding 13,14 is promoted, the temperature rising of the part of iron core 18 is suppressed, therefore, can further make miniaturization unshakable in one's determination.
And, because temperature is higher than the top that the secondary winding 14 of former limit winding 13 is positioned at former limit winding 13, even then the heat of secondary winding 14 rises, can not produce harmful effect to former limit winding 13 yet, under this state, thermoswitch 30 detects the inboard of the highest secondary winding 14 of temperature and the temperature between the iron core 18.And, because terminal board 40 is installed on the former limit winding 13, the thermoswitch 30 that is connected on the former limit winding 13 is close with terminal board 40, therefore, the lead-in wire 31,32 that is connected the thermoswitch 30 on the terminal board 40 shortens, simultaneously, do not need to be used to support other the terminal for connecting of connecting portion 35 of the lead-in wire 32 of the lead-out wire 13e of former limit winding 13 and thermoswitch 30.
And, as shown in Figure 1, transformer 12 become with the installation side of automatic temperature regulator 30 cooling air the downstream direction and be installed on the shell 2, therefore, cooling air can directly not blow to, and the installation site of automatic temperature regulator 30 becomes the highest temperature of transformer 12.That is, automatic temperature regulator 30 can detect the temperature at the maximum temperature position of transformer 12 exactly.
And in the above-described embodiments, secondary winding 14 becomes the highest temperature, still, by former limit winding 13 current ratio or the such design balance of voltage ratio with secondary winding 14, exists former limit winding 13 1 sides' temperature to be higher than the situation of secondary winding 14.In the case, thermoswitch 30 is inserted between former limit winding 13 and unshakable in one's determination 18, can detects as far as possible temperature near the maximum temperature of transformer 12.
And, in the above-described embodiments, in iron core, use E core sheet and I shape lamination, still, also can use E core sheet and E core sheet.
And transformer of the present invention can be used for transformer of other different specifications of the restriction of working temperature etc. equally.And, be not limited in the transformer that driven by magnetron is used, be widely used for the high transformer of working temperature, also can obtain same effect.
And, as shown in Figure 1, as microwave oven 1 as electronic installation one example, being contained in the shell 2 as the magnetron 16 of the electronic component that is driven by transformer 12 and the cooling fan 3 of cooling transformer 12, the automatic temperature regulator 30 of transformer 12 is configured on the relative sidepiece of a sidepiece that blows to cooling air from the cooling fan 3 of transformer 12, thus, along with the miniaturization of transformer, miniaturization, lightweight and the cost that can seek electronic installation reduce.
Claims (5)
1. be with the transformer of temperature detecting function, comprise:
Unshakable in one's determination;
Former limit winding and secondary winding on the above-mentioned iron core;
Be connected with above-mentioned former limit windings in series, the thermoswitch that more than predetermined temperature, disconnects,
Above-mentioned former limit winding and secondary winding separate on axis direction,
Above-mentioned thermoswitch is inserted between above-mentioned former limit winding or secondary winding and the iron core, has added the insulation more than pyroconductivity 0.25W/m ℃ with coating with lacquer on above-mentioned iron core, former limit winding, secondary winding and thermoswitch.
2. the transformer of band temperature detecting function according to claim 1, it is characterized in that, above-mentioned iron core is overlapping up and down second lamination of first lamination of E type and I type or E type, at the above-mentioned former limit winding of coiling on the center pillar and be positioned at coiling secondary winding above it.
3. the transformer of band temperature detecting function according to claim 1, it is characterized in that, terminal board with pair of terminal is installed on the winding of above-mentioned former limit, an end that on a side terminal, connects former limit winding, connect a side's of thermoswitch lead-in wire on the opposing party's terminal, the opposing party's of thermoswitch lead-in wire is connected on the other end of former limit winding.
4. the transformer of band temperature detecting function according to claim 3 is characterized in that, the connecting portion of the other end of above-mentioned former limit winding and the opposing party's of thermoswitch lead-in wire is supported on the above-mentioned terminal board.
5. electric device, each described transformer in the claim 1～4, be received in the enclosure by the electric component that this transformer drove, the cooling fan of cooling transformer, the thermoswitch of above-mentioned transformer is configured on the part of a sidepiece opposite side that blows to cooling air from the above-mentioned cooling fan in the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02122667 CN1288678C (en) | 2002-06-20 | 2002-06-20 | Transformer with temperature detecting function and an electric equipment arranged with the transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02122667 CN1288678C (en) | 2002-06-20 | 2002-06-20 | Transformer with temperature detecting function and an electric equipment arranged with the transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1464515A CN1464515A (en) | 2003-12-31 |
| CN1288678C true CN1288678C (en) | 2006-12-06 |
Family
ID=29743316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02122667 Expired - Lifetime CN1288678C (en) | 2002-06-20 | 2002-06-20 | Transformer with temperature detecting function and an electric equipment arranged with the transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1288678C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8207812B2 (en) * | 2008-01-09 | 2012-06-26 | Siemens Industry, Inc. | System for isolating a medium voltage |
| KR20130027340A (en) * | 2011-09-07 | 2013-03-15 | 삼성전자주식회사 | Microwave range |
| CN102360842A (en) * | 2011-10-18 | 2012-02-22 | 昆山市达功电子厂 | Power supply transformer |
| CN102623157A (en) * | 2012-04-05 | 2012-08-01 | 南通米兰特电气有限公司 | Novel temperature control ring transformer |
| US9153375B2 (en) * | 2012-08-15 | 2015-10-06 | Siemens Aktiengesellschaft | Temperature sensing system for power electronic device |
| CN103440970A (en) * | 2013-08-14 | 2013-12-11 | 昆山达功电子有限公司 | Transformer with self-protection function |
-
2002
- 2002-06-20 CN CN 02122667 patent/CN1288678C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1464515A (en) | 2003-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| CI01 | Publication of corrected invention patent application |
Correction item: Inventor Correct: Morimoto Kenji|Li Li Yan|Warashina Keisuke|Gong Qiren False: Morimoto Kenji|Li Li Yan|Warashina Keisuke|Guan Qiren Number: 53 Page: 186 Volume: 19 |
|
| CI02 | Correction of invention patent application |
Correction item: Inventor Correct: Morimoto Kenji|Li Li Yan|Warashina Keisuke|Gong Qiren False: Morimoto Kenji|Li Li Yan|Warashina Keisuke|Guan Qiren Number: 53 Page: The title page Volume: 19 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061206 |
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| CX01 | Expiry of patent term |