CN101284328A - Electric welding machine with overheating protection circuit and novel air duct - Google Patents
Electric welding machine with overheating protection circuit and novel air duct Download PDFInfo
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- CN101284328A CN101284328A CN 200810036607 CN200810036607A CN101284328A CN 101284328 A CN101284328 A CN 101284328A CN 200810036607 CN200810036607 CN 200810036607 CN 200810036607 A CN200810036607 A CN 200810036607A CN 101284328 A CN101284328 A CN 101284328A
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- welding machine
- electric welding
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- overheating protection
- air duct
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Abstract
The invention relates to a welder with an over temperature protection circuit and a novel air duct, which comprises a shell, components inside the welder and a cooling fan. All the high-power components need to be cooled inside the welder are installed in an independent metal air duct with four faces being closed and two faces being ventilated; the cooling fan is fixed on the front or the rear part of the welder; other small power components, circuit boards, small current connections on the welder, and the over temperature protection circuit are arranged between the outer side of the air duct and the shell. When the temperature is excessively high, the welder provided in the invention can well protect the welder and the cooling fan from being damaged, and meanwhile obviously improve the radiating effect of the welder.
Description
Technical field
The present invention relates to a kind of electric welding machine, relate in particular to a kind of electric welding machine with overheating protection circuit and novel air duct.
Background technology
The existing air-cooled electric welding machine type of cooling can be divided into following a few class:
1. natural air cooled: cold air enters from the electric welding machine bottom, heat by electric welding machine inner heat components and parts, hot-air is got rid of from the welding machine top, make the air Natural Circulation and reach cooling purpose, this mode cooling effectiveness is very low, and effect is bad, the welding machine Heavy Weight, the production cost height, service life is short.
2. vertical air blast cooling: utilize vertical casing inside directly to do the air channel, cooling blower is fixed on the top (blowing or exhausting) of electric welding machine mostly, and air vertically flows in the air channel, takes away the inner heat that produces of electric welding machine.The shortcoming of this mode is: duct cross-section is long-pending too big, and wind-force is not concentrated, and radiating effect is poor; Control circuit and main circuit are in together in the air channel, control circuit is disturbed by main circuit easily, and reliability and welding machine life-span that dust that the cooling air is brought into and metallic dust can influence the welding machine long-term work, be not suitable in the desert and the Loess Plateau field construction; The welding machine Heavy Weight, the production cost height.
3.SL formula air blast cooling: utilize horizontal casing inside directly to do the air channel, cooling blower is fixed on the front or rear portion of welding machine (blowing or exhausting), and air along continuous straight runs in the air channel flows, and takes away the inner heat that produces of electric welding machine.The shortcoming of this mode is: duct cross-section is long-pending big, and wind-force is not concentrated, and radiating effect is poor; Control circuit and main circuit are in together in the air channel, and control circuit is disturbed by main circuit easily, and the cooling dust brought into of air and the metallic dust reliability that can influence the welding machine long-term work, are not suitable in the desert and the Loess Plateau field construction; Welding machine weight is heavier, the production cost height.
4. cellular-type air blast cooling: cellular-type air blast cooling structure is generally horizontal, usually casing is divided into two parts up and down, utilize horizontal casing Lower Half to do the air channel, need the high performance components of cooling to be contained in the air channel, cooling blower is fixed on the front or rear portion of welding machine (blowing or exhausting), and air along continuous straight runs in the air channel flows.This mode can improve the anti-interference of electric welding machine, but wind-force is concentrated inadequately, and radiating effect is relatively poor, and electric welding machine weight is heavier, and production cost is higher.
Existing cooling blower also has some to have temperature protection circuit, and after the temperature of blower fan winding raise, the power supply (power supply generally is 380 input power supply) of blower fan, blower fan stall were cut off in blower fan temperature inside switch work meeting.This blower fan can not burn by the better protect blower fan, but can not protect electric welding machine; Because when the blower fan stall, electric welding machine but can not get protection because of the blower fan stall also in work.
Summary of the invention
A kind of electric welding machine with overheating protection circuit and novel air duct provided by the invention when temperature is too high, can protect electric welding machine and blower fan to be without prejudice well, and the radiating effect of electric welding machine is obviously improved.
In order to achieve the above object, the invention provides a kind of electric welding machine with overheating protection circuit and novel air duct, comprise casing, inner components and parts of electric welding machine and cooling blower, characteristics are, it is airtight that inner all high performance components that need cool off of electric welding machine all are installed in the four sides with the metal making, in addition in the independent ventiduct of both sides ventilation, cooling blower is fixed on the front or rear portion of electric welding machine (blowing or exhausting), remaining small-power components and parts, circuit board, the little electric current wiring of welding machine all is placed between air channel (outside) and the casing, duct cross-section is long-pending to be reduced, wind concentration, the radiating effect of welding machine is obviously improved, also realized the electromagnetic shielding of high-power circuit and control circuit and the isolation fully in control circuit and extraneous space simultaneously;
Electric welding machine of the present invention also comprises overheating protection circuit, and this circuit comprises winding, electric capacity;
Described winding and electric capacity are connected in series between the input both ends of power; Also comprise a relay, first contact, one end of described relay links to each other with an end of input power supply, and the other end is connected with an end of winding; A temperature-sensitive element; One end of described temperature-sensitive element is connected with the positive voltage of drawing from the electric welding machine control circuit, and the other end links to each other with the negative electrode of voltage-stabiliser tube, an end of the 3rd resistance; The anode of voltage-stabiliser tube is connected with 3 pin of amplifier; Between 2 pin of negative voltage of from the electric welding machine control circuit, drawing and amplifier, comprise one first resistance; The current control circuit of 1 pin of amplifier and 3 pin of comparator and electric welding machine also connects: 2 pin of comparator connect negative voltage, and 1 pin of comparator is received the base stage of triode by second resistance; The grounded emitter of triode, the colelctor electrode of triode connect an end of relay winding, another termination positive voltage of relay winding; One termination positive voltage of second contact, the other end is received the welding machine shut-off circuit.
The invention has the beneficial effects as follows: under the situation that does not increase fan delivery, the cyclic duration factor of welding machine can increase more than 20%, this means, under the situation of using same blower fan, can reduce the sectional area of wire of transformer, reactor, reduce the radiator of power semiconductor, reach the weight that alleviates welding machine, reduce production costs, improve the welding machine reliability, prolong the welding machine purpose in service life; Simultaneously, realized the electromagnetic shielding between high-power circuit and the control circuit, made the control circuit operation of electric welding machine more reliable; Dustproof effect is played in the isolation fully in control circuit and extraneous space, make electric welding machine in the desert, the field construction adaptive capacity in loess plateau improves greatly.Owing to increased a temperature-sensitive element, after the temperature of blower fan winding raise, the signal of temperature-sensitive element output was also along with change, and temperature-sensitive element links to each other with the circuit of a control welding current; When temperature is too high, not only cut off welding current, cut off the current supply circuit of blower fan simultaneously: when blower fan slightly transshipped, welding can not interrupted yet; And when blower fan seriously transshipped, welding circuit and blower fan current supply circuit turn-offed simultaneously, and both are all protected.
Description of drawings
Fig. 1 is the circuit diagram of blower fan overheating protection circuit of the present invention;
Fig. 2 is the electric welding machine front view that the present invention adopts independent heat dissipation wind channel;
Fig. 3 is the electric welding machine left view that the present invention adopts independent heat dissipation wind channel;
Fig. 4 is the electric welding machine right view that the present invention adopts independent heat dissipation wind channel;
Fig. 5 is the electric welding machine vertical view that the present invention adopts independent heat dissipation wind channel.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
As shown in Figure 1, the present invention includes winding L, capacitor C; Described winding L and capacitor C are connected in series between the two ends at input power supply A, B; Also comprise a relay J, the first contact J1, one end of described relay J links to each other with an end A of input power supply, and the other end is connected with an end of winding L; A temperature-sensitive element Rt; The end of described temperature-sensitive element Rt is connected with the positive voltage U+ that draws from the electric welding machine control circuit, and the other end links to each other with the negative electrode of voltage-stabiliser tube DW, an end of the 3rd resistance R 3; The anode of voltage-stabiliser tube DW is connected with 3 pin of amplifier I; Between 2 pin of negative voltage U-that from the electric welding machine control circuit, draws and amplifier I, comprise one first resistance R 1; The current control circuit 11 of 1 pin of amplifier I and 3 pin of comparator B and electric welding machine also connects; 2 pin of comparator B connect negative voltage U-, and 1 pin of comparator B is received the base stage of triode T by second resistance R 2, the grounded emitter of triode T, and the colelctor electrode of triode T connects an end of relay J winding, another termination positive voltage U+ of relay J winding; The termination positive voltage U+ of the second contact J2, the other end is received welding machine shut-off circuit 12.
The operation principle of overheating protection circuit is as follows: when blower fan is operated in normal condition, relay J is failure to actuate, the first contact J1, the second contact J2 closure, input power supply A arrives B through the first contact J1, winding 1, capacitor C, the blower fan winding has, this moment, the resistance of Rt was bigger, and the E point voltage is lower, is not enough to puncture voltage-stabiliser tube DW; 1 pin of amplifier I output 0V, 1 pin of comparator B is also exported 0V, the relay J not adhesive of cutting off the power supply.
After temperature raise, the E point voltage surpassed the breakdown voltage of voltage-stabiliser tube DW, and 3 pin of amplifier I have voltage, and 1 pin of amplifier I has voltage, and strengthens along with the rising of temperature, and this voltage is delivered to the welding current control circuit, and this moment, 1 pin of comparator B was exported 0V.
After temperature continues to raise, the E point voltage further raises, the 1 pin voltage of amplifier I also raises, this moment comparator B 1 pin output HIGH voltage, triode T conducting, the relay J adhesive first contact J1, the second contact J2 all disconnect, and the first contact J1 cuts off the power supply circuits of blower fan, and the second contact J2 closes welding machine shut-off circuit 12; Like this, blower fan and electric welding machine all can not damage because of overheated.
Shown in Fig. 2-5, be bent into II template 10 with a metallic plate, II template 10 combines the independent heat dissipation wind channel 2 that the back forms a sealing with welding machine base plate 9, the front end in air channel 2 is vent windows 3, blower fan 4 is installed in the rear end, the cooling air flows through air channel 2 (blowing or exhausting) from horizontal direction: parts such as high performance components such as transformer 5 and reactor 6 are placed directly in the air channel 2 of sealing, power semiconductor radiator 7 is installed in the both sides in the air channel 2, and control circuit board 8 light current such as grade zero, parts are installed in II template 10 outside top.
The cooling air very the concentrated area flow through need heat radiation zero, parts, obviously improved the radiating effect of electric welding machine, also realized the electromagnetic shielding between high-power circuit and the control circuit and the isolation fully in control circuit and extraneous space simultaneously.
Claims (5)
1. the electric welding machine with overheating protection circuit and novel air duct comprises casing, the inner components and parts of electric welding machine and cooling blower, it is characterized in that, comprises overheating protection circuit;
This overheating protection circuit comprises winding (L), electric capacity (C); Described overheating protection circuit also comprises a temperature-sensitive element (Rt); One end of described temperature-sensitive element (Rt) is connected with the positive voltage of drawing from the electric welding machine control circuit (U+), and the other end links to each other with the negative electrode of voltage-stabiliser tube (DW), an end of the 3rd resistance (R3).
2. the electric welding machine with overheating protection circuit and novel air duct as claimed in claim 1 is characterized in that, described winding (L) and electric capacity (C) the input both ends of power (A, B) between the serial connection.
3. the electric welding machine with overheating protection circuit and novel air duct as claimed in claim 2; it is characterized in that; described overheating protection circuit also comprises a relay (J); first contact (J1) end of described relay (J) links to each other with an end (A) of input power supply, and the other end is connected with an end of winding (L).
4. the electric welding machine with overheating protection circuit and novel air duct as claimed in claim 4 is characterized in that, described overheating protection circuit also comprises a voltage-stabiliser tube (DW), and the anode of this voltage-stabiliser tube (DW) is connected with 3 pin of amplifier (I); Between 2 pin of negative voltage of from the electric welding machine control circuit, drawing (U-) and amplifier (I), comprise one first resistance (R1); The current control circuit (11) of 3 pin of 1 pin of amplifier (I) and comparator (B) and electric welding machine also connects; 2 pin of comparator (B) connect negative voltage (U-), 1 pin of comparator (B) is received the base stage of triode (T) by second resistance (R2), the grounded emitter of triode (T), the colelctor electrode of triode (T) connects an end of relay (J) winding, another termination positive voltage (U+) of relay (J) winding; One termination positive voltage (U+) of second contact (J2), the other end is received welding machine shut-off circuit (12).
5. the electric welding machine with overheating protection circuit and novel air duct as claimed in claim 1; it is characterized in that; inner all high performance components that need cool off of electric welding machine be installed in all that four sides that makes of metal is airtight, in the independent ventiduct (2) of other both sides ventilation; cooling blower is fixed on the front or rear portion of electric welding machine, and the little electric current wiring of remaining small-power components and parts, circuit board, welding machine all is placed between the outside, air channel and the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810036607 CN101284328A (en) | 2008-04-24 | 2008-04-24 | Electric welding machine with overheating protection circuit and novel air duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810036607 CN101284328A (en) | 2008-04-24 | 2008-04-24 | Electric welding machine with overheating protection circuit and novel air duct |
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| Publication Number | Publication Date |
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| CN101284328A true CN101284328A (en) | 2008-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810036607 Pending CN101284328A (en) | 2008-04-24 | 2008-04-24 | Electric welding machine with overheating protection circuit and novel air duct |
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| CN (1) | CN101284328A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105171185A (en) * | 2015-09-09 | 2015-12-23 | 北京时代科技股份有限公司 | Integrated welding power source structure |
| CN111781969A (en) * | 2020-07-23 | 2020-10-16 | 上海华力微电子有限公司 | Temperature control circuit, device and chip packaging test system |
-
2008
- 2008-04-24 CN CN 200810036607 patent/CN101284328A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105171185A (en) * | 2015-09-09 | 2015-12-23 | 北京时代科技股份有限公司 | Integrated welding power source structure |
| CN111781969A (en) * | 2020-07-23 | 2020-10-16 | 上海华力微电子有限公司 | Temperature control circuit, device and chip packaging test system |
| CN111781969B (en) * | 2020-07-23 | 2022-03-04 | 上海华力微电子有限公司 | Temperature control circuit, device and chip packaging test system |
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Open date: 20081015 |