CN110829377A - High temperature air conditioner three-phase compressor overcurrent protection control system - Google Patents
High temperature air conditioner three-phase compressor overcurrent protection control system Download PDFInfo
- Publication number
- CN110829377A CN110829377A CN201911112543.1A CN201911112543A CN110829377A CN 110829377 A CN110829377 A CN 110829377A CN 201911112543 A CN201911112543 A CN 201911112543A CN 110829377 A CN110829377 A CN 110829377A
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- phase
- compressor
- alternating current
- phase alternating
- air conditioner
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- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an overcurrent protection control system for a three-phase compressor of a high-temperature air conditioner, which comprises an integrated circuit board, a three-phase alternating current contactor, a thermal overload relay, the compressor and a three-phase alternating current power supply, and is characterized in that: the integrated circuit board is respectively provided with a CPU chip, a current transformer, a switching value output module and a signal input terminal; the current transformer, the switching value output module and the signal input terminal are respectively and electrically connected with the CPU chip; after any phase of the three-phase alternating current power supply passes through the current transformer, the phase of the three-phase alternating current power supply and the other two phases of the three-phase alternating current power supply are connected with the input end of the three-phase alternating current contactor together, and the three-phase output end of the three-phase alternating current contactor is connected with the input end of the three-phase thermal overload relay; the output end of the three-phase thermal overload relay is connected with the three-phase input end of the compressor, and the switching value output module is connected with a coil of the three-phase alternating current contactor.
Description
Technical Field
The invention relates to the field of overcurrent protection control of three-phase compressors, in particular to an overcurrent protection control system of a three-phase compressor of a high-temperature air conditioner.
Background
As the traveling crane cab and the electric machine room around the front of the furnace in steel plants, coking plants, smelting plants and the like in the metallurgical industry are often in high-temperature, dusty and large-vibration environments and occasions, the extreme high temperature can reach 75 ℃, the pressure of a refrigeration system and the exhaust temperature of a compressor are rapidly increased when an air conditioner is at high temperature, so that the compressor is overloaded, and the current can rapidly increase to the limit current of the compressor.
The special high-temperature air conditioner is used as a basic unit of the equipment to perform the tasks of heat transmission and man-machine loop control, responds to the change of external environment and internal heat load, and must ensure reliable working performance and safe operation of the compressor in the high-temperature environment.
The air conditioner operates in the high-temperature environment, and because the pressure of a refrigeration system and the exhaust temperature of the compressor are very high, the compressor is often in overload operation, and a three-phase thermal overload relay is adopted to protect the overload current of the compressor; because the three-phase thermal overload relay is a mechanical action component, the contact is pushed to act through the heating deformation of the bimetallic strip, the action needs a certain time, and the quick break cannot be realized. For the air conditioner working at the extreme high temperature of over 75 ℃, if the system is abnormal, the current can quickly rise to the limit current of the compressor, and the air conditioner must be quickly cut off to protect the compressor, so that the current transformer is adopted to detect the overcurrent of the compressor, and the CPU chip processes and judges to realize quick cut-off.
Therefore, the over-current protection control system of the high-temperature air conditioner three-phase compressor with the microcomputer control is designed, the compressor is subjected to over-current protection by adopting the three-phase thermal overload relay, the over-current value of the compressor is detected through the current transformer, the quick-break protection is realized, the time delay of the restarting of the compressor is ensured for 3min in the process, and the loaded starting of the compressor is prevented. Different systems can design proper overcurrent values according to the system, realize the protection of compressor overcurrent and the compressor overcurrent of the air conditioner under severe conditions, and reliably protect the compressor.
Disclosure of Invention
The invention aims to provide an overcurrent protection control system for a three-phase compressor of a high-temperature air conditioner, which is used for carrying out overload and overcurrent protection on the three-phase compressor of the air conditioner working under high-temperature and severe environment so as to ensure the safety of the compressor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a high temperature air conditioner three-phase compressor overcurrent protection control system, including integrated circuit board, three-phase ac contactor, thermal overload relay, compressor and three-phase ac power supply, its characterized in that: the integrated circuit board is respectively provided with a CPU chip, a current transformer, a switching value output module, a signal input terminal and a signal I/O terminal; the current transformer, the switching value output module, the signal input terminal and the signal I/O terminal are respectively and electrically connected with the CPU chip; after any phase of the three-phase alternating current power supply passes through the current transformer, the phase of the three-phase alternating current power supply and the other two phases of the three-phase alternating current power supply are connected with the input end of the three-phase alternating current contactor together, and the three-phase output end of the three-phase alternating current contactor is connected with the input end of the three-phase thermal overload relay; the output end of the three-phase thermal overload relay is connected with the three-phase input end of the compressor, and the switching value output module is connected with a coil of the three-phase alternating current contactor.
The overcurrent protection control system for the high-temperature air conditioner three-phase compressor is characterized in that: the overload current of the compressor is heated and deformed by a bimetallic strip of the three-phase thermal overload relay to push the contact to act, the on-off signal state of the contact is detected by a CPU chip, and a coil of the three-phase alternating current contactor is controlled by a switching value output module.
The overcurrent protection control system for the high-temperature air conditioner three-phase compressor is characterized in that: the over-current of the compressor is detected by the current transformer, the CPU chip processes and judges, and the coil of the three-phase alternating current contactor is controlled by the switching value output module.
The overcurrent protection control system for the high-temperature air conditioner three-phase compressor is characterized in that: and the switching value output module adopts a relay module.
The air conditioner runs under high temperature and severe environment, because the pressure of a refrigeration system and the exhaust temperature of a compressor are very high, the compressor is often in overload running, a three-phase thermal overload relay is adopted to carry out overload current protection on the compressor, a three-phase thermal overload relay contact is used as signal input, a compressor stopping signal is sent out through the acquisition and processing judgment of a CPU chip, a switching value output module loses power, a three-phase alternating current contactor contact is disconnected, the compressor stops, a fault code signal is sent out, the compressor is ensured to be restarted for 3min through software program control, and the compressor is prevented from being started in an on-load mode.
The three-phase thermal overload relay is a mechanical action component, and pushes the contact to act by means of heating deformation of the bimetallic strip, so that the action needs a certain time, and quick disconnection cannot be realized. For the air conditioner working at the extreme high temperature of over 75 ℃, if the system is abnormal, the current can rapidly rise to the limit current of the compressor, and the air conditioner must be quickly disconnected for protecting the compressor. The compressor overcurrent value is detected through the current transformer, when the current value passing through the current transformer is larger than the set overcurrent value, the CPU chip processes and judges, a compressor stopping signal is sent immediately, the switching value output module loses power, the three-phase alternating current contactor contact is disconnected, the compressor stops, and a fault code signal is sent to realize quick disconnection, the compressor is controlled by a software program, the compressor restart time is guaranteed to be delayed for 3min, and the compressor is prevented from being started in a loading mode.
The invention has the beneficial effects that:
1) the invention has the advantages that the three-phase thermal overload relay is adopted to carry out overload current protection on the compressor, the overcurrent value of the compressor is detected through the current transformer, the quick break is realized, and the safety of the high-temperature air conditioner in operating the three-phase compressor in a high-temperature and severe environment is thoroughly protected.
2) By adopting an electronic technology, when the compressor is protected, a fault code is displayed on the operation panel, and man-machine conversation is realized.
3) The invention has novel thought and safe and reliable protection measures.
4) The control system of the invention has simple structure and is easy to manufacture.
5) The control system has wide application range and can be widely applied to three-phase loads needing overcurrent protection in various systems.
Drawings
FIG. 1 is a schematic structural diagram.
Fig. 2 is a schematic block diagram.
Detailed Description
Referring to fig. 1 and 2, an overcurrent protection control system for a three-phase compressor of a high-temperature air conditioner comprises an epoxy resin PCB (printed circuit board) 1, a three-phase ac contactor 8, a three-phase thermal overload relay 7, a compressor 6 and a three-phase ac power supply 9; the CPU chip 2, the current transformer 3, the relay module 4, the operation panel signal I/O terminal 10 and the three-phase thermal overload relay normally closed contact signal input terminal 5 are respectively arranged on the epoxy resin PCB printed circuit board 1. The current transformer 3, the relay module 4, three-phase thermal overload relay normally closed contact signal input terminal 5 and operating panel signal I/O terminal 10 are connected with CPU chip 2 electricity respectively, after any phase of three-phase alternating current power supply 9 passed current transformer 3, be connected with three-phase alternating current contactor 8's input with the other two-phase of three-phase alternating current power supply 9 together, three-phase alternating current contactor 8's output is connected with three-phase thermal overload relay 7 input, three-phase thermal overload relay 7 output is connected with the three-phase input of compressor 6, relay module 4 is connected with three-phase alternating current contactor 8's coil.
The following is further described with reference to the accompanying drawings:
the method comprises the steps that the three-phase alternating current contactor 8 is powered on, the compressor 6 works, when the compressor 6 is overloaded, the three-phase thermal overload relay 7 acts, the normally closed contact on the three-phase thermal overload relay is disconnected, the CPU chip 2 immediately sends a compressor stopping signal after receiving a signal that the normally closed contact of the three-phase thermal overload relay 7 is disconnected, the relay module 4 is powered off, the contact of the three-phase alternating current contactor 8 is disconnected, the compressor 6 stops working, a fault code signal is sent out, and a fault code is displayed on an operation panel through the signal I/O terminal 10.
When the compressor 6 is in overcurrent and the current transformer 3 detects an overcurrent value set in a program, the CPU chip 2 immediately sends a signal for stopping the compressor 6, the relay module 4 is powered off, the contact of the three-phase AC contactor 8 is disconnected, the compressor 6 stops working, a fault code signal is sent out, and a fault code is displayed on an operation panel through the signal I/O terminal 10.
The above embodiments are not limited to the scope of the present technology, and all modifications or variations based on the basic idea of the present technology belong to the scope of the present technology.
Claims (4)
1. The utility model provides a high temperature air conditioner three-phase compressor overcurrent protection control system, including integrated circuit board, three-phase ac contactor, thermal overload relay, compressor and three-phase ac power supply, its characterized in that: the integrated circuit board is respectively provided with a CPU chip, a current transformer, a switching value output module, a signal input terminal and a signal I/O terminal; the current transformer, the switching value output module, the signal input terminal and the signal I/O terminal are respectively and electrically connected with the CPU chip; after any phase of the three-phase alternating current power supply passes through the current transformer, the phase of the three-phase alternating current power supply and the other two phases of the three-phase alternating current power supply are connected with the input end of the three-phase alternating current contactor together, and the three-phase output end of the three-phase alternating current contactor is connected with the input end of the three-phase thermal overload relay; the output end of the three-phase thermal overload relay is connected with the three-phase input end of the compressor, and the switching value output module is connected with a coil of the three-phase alternating current contactor.
2. The overcurrent protection control system for the three-phase compressor of the high-temperature air conditioner as recited in claim 1, wherein: the overload current of the compressor is heated and deformed by a bimetallic strip of the three-phase thermal overload relay to push the contact to act, the on-off signal state of the contact is detected by a CPU chip, and a coil of the three-phase alternating current contactor is controlled by a switching value output module.
3. The overcurrent protection control system for the three-phase compressor of the high-temperature air conditioner as recited in claim 1, wherein: the over-current of the compressor is detected by the current transformer, the CPU chip processes and judges, and the coil of the three-phase alternating current contactor is controlled by the switching value output module.
4. The overcurrent protection control system for the three-phase compressor of the high-temperature air conditioner as recited in claim 1, wherein: and the switching value output module adopts a relay module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112543.1A CN110829377A (en) | 2019-11-14 | 2019-11-14 | High temperature air conditioner three-phase compressor overcurrent protection control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112543.1A CN110829377A (en) | 2019-11-14 | 2019-11-14 | High temperature air conditioner three-phase compressor overcurrent protection control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110829377A true CN110829377A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911112543.1A Pending CN110829377A (en) | 2019-11-14 | 2019-11-14 | High temperature air conditioner three-phase compressor overcurrent protection control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952937A (en) * | 2020-08-03 | 2020-11-17 | 合肥天鹅制冷科技有限公司 | Vehicle-mounted air conditioner single-phase compressor overcurrent protection control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306925A (en) * | 2011-09-16 | 2012-01-04 | 苏州创泰电子有限公司 | Digital thermal relay |
| CN204264918U (en) * | 2014-11-13 | 2015-04-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A protection system to prevent the chain from being damaged due to the overload of the scraper machine |
| CN107294065A (en) * | 2017-08-22 | 2017-10-24 | 合肥天鹅制冷科技有限公司 | Compressor phase shortage fast tripping protection device |
| CN210898515U (en) * | 2019-11-14 | 2020-06-30 | 合肥天鹅制冷科技有限公司 | High temperature air conditioner three-phase compressor overcurrent protection control system |
-
2019
- 2019-11-14 CN CN201911112543.1A patent/CN110829377A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306925A (en) * | 2011-09-16 | 2012-01-04 | 苏州创泰电子有限公司 | Digital thermal relay |
| CN204264918U (en) * | 2014-11-13 | 2015-04-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A protection system to prevent the chain from being damaged due to the overload of the scraper machine |
| CN107294065A (en) * | 2017-08-22 | 2017-10-24 | 合肥天鹅制冷科技有限公司 | Compressor phase shortage fast tripping protection device |
| CN210898515U (en) * | 2019-11-14 | 2020-06-30 | 合肥天鹅制冷科技有限公司 | High temperature air conditioner three-phase compressor overcurrent protection control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952937A (en) * | 2020-08-03 | 2020-11-17 | 合肥天鹅制冷科技有限公司 | Vehicle-mounted air conditioner single-phase compressor overcurrent protection control system |
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