CN2200250Y - Power supply protector for hot-air curtain machine - Google Patents
Power supply protector for hot-air curtain machine Download PDFInfo
- Publication number
- CN2200250Y CN2200250Y CN 94229037 CN94229037U CN2200250Y CN 2200250 Y CN2200250 Y CN 2200250Y CN 94229037 CN94229037 CN 94229037 CN 94229037 U CN94229037 U CN 94229037U CN 2200250 Y CN2200250 Y CN 2200250Y
- Authority
- CN
- China
- Prior art keywords
- amplifier
- power supply
- circuit
- input
- air curtain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000001012 protector Effects 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a power supply protector. The outside of the structure is a shell body, and the inner part of the shell body is provided with a contactor and a circuit control board. The circuit board is provided with sampled signals of a phase circuit and a zero circuit, and the sampled signals are sent to a balanced amplifier after rectified. A relay and the contactor are driven through the amplifier, and the circuit fails and is in imbalance. The output of the amplifier makes the relay not work, the circuit is interrupted, and thereby, a hot air curtain machine is protected. The utility model has the advantages of simple circuit construction, sensitive control, the current signal from the power supply self and stable circuit performance, and the hot air curtain machine runs for a long time and is safe.
Description
The utility model belongs to a kind of apparatus for protecting power supply.
At present with the hot air curtain device of positive temperature coefficient ceramic semiconductor element (PTC) as electric heating element, because its heat efficiency height, energy savings and in some hotels, shop, being widely used, and the superiority that more and more seems, but cause warm air curtain to be in " dry-fire condition " of nothing blowing owing to manipulating improper or local being out of order.This state duration one is long, certainly will might cause the hot air curtain device internal temperature too high, makes the shell guard be subjected to overheated and damages.Because hot air curtain device power is very big, causes the damage of surrounding devices and the generation of fire incident easily.
Currently used hot air curtain device does not all have apparatus for protecting power supply, utilizes its characteristic, temperature height and electric current reduces, and omited its safety measure.Because the accidental generation phase failure or partial discharge also all cause the unsafe factor in the use, its power supply connection generally all adopts star to connect.
Be to solve the power supply protection of hot air curtain device, the purpose of this utility model provides a kind of hot air curtain device power supply protector, utilizes the current signal of power supply self, realizes that circuit supply cuts off the power supply immediately when unusual and keeps power on the mutually purpose of regular turn of blower fan and power supply.
Circuit structure of the present utility model is achieved in that the at first rationale of explanation design; the PCT calandria is energising heating on the one hand in hot air curtain device; be subjected to blower fan blowing and diffusing in air on the other hand again heat; be in the PCT calandria of this " heat balance " state; actual heating current is bigger; in case blower fan quits work; PCT calandria temperature rises rapidly; reach Curie point; electric current just reduces rapidly, therefore, sharply reduces in case testing circuit detects source current; and when being significantly smaller than running current, protector just stops the power supply of warm air curtain.Adopt heating and blower fan chain reaction in circuit design, not fan energising does not just start heater; Again for the protection of the power supply phase failure or heater partial discharge sparking; for making the network load balance; and heater is operated under the lower supply voltage; the star that the warm air curtain heater connects or have zero line connects; when operate as normal, in a basic balance by three-phase, differ each other 120 ° of phase angles and three phase mains to compile the neutral line current that forms very little; in case the phase failure (promptly cut off the electricity supply, thereby reach power protection to hot air curtain device) takes place.The advantage of the utility model: circuit structure is simple, and control is sensitive, takes from the current signal of power supply own and controls, and circuit performance is stable, thereby makes the hot air curtain device long-time running safe and reliable.
This hot air curtain device outside is a housing, and contactor and circuit board are housed in the housing, and its circuit structure is illustrated in conjunction with the embodiments.
Fig. 1 is a hot air curtain device power supply protector shape assumption diagram;
Fig. 2 is hot air curtain device power supply protector interior arrangement figure;
Fig. 3 is a hot air curtain device power supply protector schematic diagram.
Circuit structure (as shown in Figure 3) is made up of three parts: 1) be connected in series contactor J0 normal opened contact respectively in three phase mains a, b, c, J0 magnetizing coil serial connection J1 contact; 2) draw with zero line by arbitrary in the three phase mains, use by obtaining positive and negative DC power supply road respectively through assembly 7805 and 7905 again behind transformer, the bridge rectifier; 3) the one tunnel be that any phase power supply of three power supply a, b, c passes through current transformer wherein, an input that connects amplifier 1A after the rectifier bridge rectification, another input of amplifier 1A is connected through electric resistance partial pressure by DC power supply+VC, amplifier 1A output connects amplifier 2A input behind electric resistance partial pressure, export an input that is connected to amplifier 3A after anti-phase; Another road is the current transformer on " zero line ", after rectification output, be connected to another input of amplifier 3A, amplifier 3A output connects two-stage triode amplifier input through resistance, triode amplifier collector series relay J1 magnetizing coil, serial connection manually " heats and closes " " heating is opened " switch, 1A in the circuit in the circuit of J1,2A, after the 3A amplification is anti-phase, import in comparator 3A formation balance with the rectification output of zero line, output promotes triode conducting work, the J1 conducting, the J0 conducting, three phase mains normally moves, because power failure, as mentioned above, comparator 3A input disequilibrium, triode ends, J1 does not work, and J0 does not work.
Claims (2)
1, a kind of hot air curtain device power supply protector is made up of the housing and the inner control circuit plate of outside, it is characterized in that circuit is made up of three parts:
1) in three phase mains a, b, c, is connected in series the normal opened contact of contactor J0 respectively;
2) draw with zero line by arbitrary among three phase mains a, b, the c, use by obtaining positive and negative DC power supply road respectively through assembly 7805 and 7905 again behind transformer, the bridge rectifier;
3) the one tunnel be that any phase power supply of three power supply a, b, c passes through current transformer wherein, an input that connects amplifier 1A after the rectifier bridge rectification, another input of amplifier 1A is connected through electric resistance partial pressure by DC power supply+VC, amplifier 1A output connects amplifier 2A input through electric resistance partial pressure, exports an input that is connected to amplifier 3A after anti-phase; Another road is the current transformer on " zero line ", after rectification output, be connected to another input of amplifier 3A, amplifier 3A output connects two-stage triode amplifier input through resistance, triode amplifier collector series relay J1 magnetizing coil, serial connection manually " heats and closes " " heating is opened " switch in the circuit of J1.
2, by the described power supply protector of claim 1, it is characterized in that amplifier 1A, the 2A, the 3A that adopt in this protective circuit are 1/4LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94229037 CN2200250Y (en) | 1994-06-30 | 1994-06-30 | Power supply protector for hot-air curtain machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94229037 CN2200250Y (en) | 1994-06-30 | 1994-06-30 | Power supply protector for hot-air curtain machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2200250Y true CN2200250Y (en) | 1995-06-07 |
Family
ID=33841446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94229037 Expired - Fee Related CN2200250Y (en) | 1994-06-30 | 1994-06-30 | Power supply protector for hot-air curtain machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2200250Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570804A (en) * | 2013-10-12 | 2015-04-29 | 樱花卫厨（中国）股份有限公司 | Applying circuit for detecting current of fan in real time |
| CN107300655A (en) * | 2017-07-17 | 2017-10-27 | 广东美的制冷设备有限公司 | The failure detector of air conditioner and wherein electric heater, method |
-
1994
- 1994-06-30 CN CN 94229037 patent/CN2200250Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570804A (en) * | 2013-10-12 | 2015-04-29 | 樱花卫厨（中国）股份有限公司 | Applying circuit for detecting current of fan in real time |
| CN107300655A (en) * | 2017-07-17 | 2017-10-27 | 广东美的制冷设备有限公司 | The failure detector of air conditioner and wherein electric heater, method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |