CN103600748A - Air-conditioning unit - Google Patents
Air-conditioning unit Download PDFInfo
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- CN103600748A CN103600748A CN201310587838.0A CN201310587838A CN103600748A CN 103600748 A CN103600748 A CN 103600748A CN 201310587838 A CN201310587838 A CN 201310587838A CN 103600748 A CN103600748 A CN 103600748A
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Abstract
The invention discloses an air-conditioning unit, and relates to the technical field of air-conditioning equipment. The air-conditioning unit mainly comprises an air-conditioning housing, a compressor, a condenser, a condenser fan, an evaporator, an evaporator fan, a bypass pipeline, a bypass solenoid valve, a first-stage high-pressure switch and/or temperature control switch. The inlet of the bypass pipeline is communicated with an outlet medium pipeline of the compressor, the outlet of the bypass pipeline is communicated with the medium pipeline of the evaporator, the bypass solenoid valve is arranged on the bypass pipeline, and the first-stage high-pressure switch is arranged on the medium pipeline of the compressor outlet. When the environmental temperature is higher than 52 DEG C and the system pressure is larger than 2.9 MPa, the first-stage high-pressure switch switches off, and the bypass solenoid valve is opened or is controlled by the temperature control switch to open, part of refrigerant medium flows into the evaporator directly through the bypass pipeline so as to protect the compressor for normal operation. The air-conditioning unit has the advantages of simple structure and the air-conditioning unit is adaptable to high environmental temperature.
Description
Technical field
The present invention relates to air conditioning equipment technical field.
Background technology
The effect of vehicle air conditioner is exactly that temperature, relative humidity, speed air flow and cleanliness (mainly referring to dust and carbon dioxide content) in guest room are kept within the limits prescribed, is the environment by bus of passenger's Creating Comfort.Refrigeration system vaporization cycle process in general air-conditioning unit is as follows:
1. compressor compresses becomes the dielectric gas of high pressure-temperature.2. the high-temperature gas air-cooled condenser of flowing through, cooling through the pressure of outside air, is condensed into the liquid of normal temperature high voltage.3. liquid medium flows through capillary-compensated step-down, becomes the gas-liquid mixed media of low-temp low-pressure.4. the cryogenic gas evaporator of flowing through, absorbs the air heat that flows through evaporator, flashes to the steam of low-temp low-pressure, in this process, absorbs heat, thereby indoor temperature is reduced.5. then the steam of low-temp low-pressure is sucked by compressor again, completes the refrigerating cycle of a sealing.
The principle of heating of air-conditioning unit is the same with refrigeration principle, and refrigeration is to use evaporator to absorb heat from air, and heating is to use condenser to generate heat in air; Also can utilize the logical heat transfer of electric heater near air themperature to be improved to realize the function heating, by evaporation fan, in car, send hot blast again, by control system, automatically regulate the air themperature in car, make to maintain certain comfort temperature in car, this type of heating efficiency is higher.
Railcar generally moves in Urban underground Tunnel, and tunnel space is narrow and small, and fanning effect is poor, and summer environment temperature is up to more than 50 degree.Railcar is more and more harsher to the requirement of air-conditioning unit at present, and the maximum environmental temperature that can move comprising air-conditioning unit requires constantly improving.
Air-conditioning unit generally makes a service test according to regulation cooling condition in TB/T 1804, and wherein peak load refrigeration performance test requirements document outdoor environment dry bulb temperature is 45 ℃, practical requirement no longer.When ambient temperature is greater than 45 ℃ and system pressure when higher, the compressor scaling loss that will overload, affects a/c system and normally moves.
Summary of the invention
Technical matters to be solved by this invention be to provide a kind of simple in structure, easy to use, can automatically regulate, can compared with under high ambient temperature operation, safe and reliable and lower-cost air-conditioning unit.Be particularly useful for railcar.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of air-conditioning unit, comprise air conditioner casing, compressor, condenser, condensation fan, evaporator and evaporation fan, described compressor, condenser, condensation fan, evaporator and evaporation fan are all fixed in air conditioner casing, compressor, condenser, evaporator is connected by medium pipeline successively with compressor, medium pipeline between condenser and evaporator is provided with capillary tub, low pressure switch is arranged on the medium pipeline between evaporator and compressor, also comprise a bypass duct, bypass solenoid valve, control one-level high-pressure switch and/or the coolant-temperature switch of bypass solenoid valve, the entrance point of described bypass duct and compressor, pipeline between condenser communicates, the exit end of bypass duct and condenser, pipeline between evaporator communicates, described bypass solenoid valve is arranged on bypass duct, described one-level high-pressure switch is arranged on the medium pipeline between compressor and bypass duct entrance point.
Preferably, comprise one-level high-pressure switch and secondary high-pressure switch, described secondary high-pressure switch and one-level high-pressure switch are set up in parallel on the medium pipeline between compressor and bypass duct entrance point.
Preferably, on the medium pipeline between bypass solenoid valve and evaporator, be provided with bypass capillary.
Preferably, on the medium pipeline of condensator outlet end, be provided with device for drying and filtering.
Preferably, also comprise electric heater, be arranged on evaporator one side.
The beneficial effect that adopts technique scheme to produce is: by bypass duct is set, bypass solenoid valve is set on bypass duct, one-level high-pressure switch and secondary high-pressure switch or coolant-temperature switch are set on the medium pipeline between compressor and condenser, when ambient temperature is higher than 52 ℃, and when system pressure is greater than 2.9MPa, one-level high-pressure switch disconnects, control system is after receiving signal, bypass solenoid valve is opened, or control opening of bypass solenoid valve by coolant-temperature switch, part of refrigerant medium flows directly into evaporator by bypass duct, when ambient temperature continues to raise, higher than 60.5 ℃, now system pressure will reach 3.2MPa, secondary high-pressure switch disconnects, control system is after receiving signal, cut off compressor power, a/c system quits work, with protection compressor, in normally-pressured neighbor, move, avoid compressor overload scaling loss, bypass capillary is set on the medium pipeline between bypass solenoid valve and evaporator and can plays to the part medium of shunting the effect of reducing pressure by regulating flow, on the medium pipeline of condensator outlet end, be provided with device for drying and filtering, can be used for collecting the solid impurities in refrigeration system, prevent that refrigeration system and capillary tub from stopping up, guarantee that medium pipeline is unimpeded, in evaporator one side, electric heater is set, can when needs heat, heats, improve heating efficiency, this air-conditioning unit can be freezed, also can heat.That the present invention has is simple in structure, easy to use, can automatically regulate, can be compared with operation, safe and reliable and lower-cost air-conditioning unit under high ambient temperature.Be particularly useful for railcar.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of one embodiment of the invention;
In figure: 1-compressor, 2-one-level high-pressure switch, 3-secondary high-pressure switch, 4-condenser, 5-condensation fan, 6-evaporator, 7-evaporation fan, 8-electric heater, 9-low pressure switch, 10-capillary tub, 11-bypass solenoid valve, 12-bypass capillary, 13-device for drying and filtering, 14-bypass duct.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
A kind of air-conditioning unit as shown in Figure 1, comprise air conditioner casing, compressor 1, condenser 4, condensation fan 5, evaporator 6 and evaporation fan 7, described compressor 1, condenser 4, condensation fan 5, evaporator 6 and evaporation fan 7 are all fixed in air conditioner casing, compressor 1, condenser 4, evaporator 6 is connected by medium pipeline successively with compressor 1, medium pipeline between condenser 4 and evaporator 6 is provided with capillary tub 10, low pressure switch 9 is arranged on the medium pipeline between evaporator 6 and compressor 1, also comprise a bypass duct 14, bypass solenoid valve 11, control one-level high-pressure switch 2 and/or the coolant-temperature switch of bypass solenoid valve 11, the entrance point of described bypass duct 14 and compressor 1, pipeline between condenser 4 communicates, the exit end of described bypass duct 14 and condenser 4, pipeline between evaporator 6 communicates, described bypass solenoid valve 11 is arranged on bypass duct 14, described one-level high-pressure switch 2 is arranged on the medium pipeline between compressor 1 and bypass duct 14 entrance points, when ambient temperature is higher than 52 ℃, and when system pressure is greater than 2.9MPa, one-level high-pressure switch 2 disconnects, control system is after receiving signal, bypass solenoid valve 11 is opened, or control opening of bypass solenoid valve by coolant-temperature switch, part of refrigerant medium flows directly into evaporator 6 by bypass duct 14, on the medium pipeline between bypass solenoid valve 11 and evaporator 6, be provided with bypass capillary 12, by to bypass capillary 12 length, the design of caliber, can before entering evaporator 6, carry out the effect of reducing pressure by regulating flow to the part medium of shunting away, on the medium pipeline between compressor 1 and bypass duct 14 entrance points, one-level high-pressure switch 2 and secondary high-pressure switch 3 are set, secondary high-pressure switch 3 is set up in parallel with one-level high-pressure switch 2, when ambient temperature continues to raise, higher than 60.5 ℃, now system pressure will reach 3.2MPa, secondary high-pressure switch 3 disconnects, control system is after receiving signal, cut off compressor 1 power supply, a/c system quits work, with protection compressor 1, in normally-pressured neighbor, move, avoid compressor 1 overload scaling loss, guarantee air-conditioning unit safe in operation.The cost of the increase of bypass duct 14, bypass solenoid valve 11, one-level high-pressure switch 2, secondary high-pressure switch 3, capillary tub 10 and bypass capillary 12 is not high, but can play the effect of maintaining system safety operation, extend the service life of compressor 1, thereby reduced system operation cost.
In air-conditioning unit running process, as shown in Figure 1 hollow arrow be depicted as original MEDIA FLOW to, when ambient temperature is higher than 52 ℃, and when system pressure is greater than 2.9MPa, one-level high-pressure switch 2 disconnects, control system is after receiving signal, bypass solenoid valve 11 is opened, , or enter bypass duct 14 by the part of refrigerant medium shunt of opening of coolant-temperature switch control bypass solenoid valve 11, reducing pressure by regulating flow effect through bypass capillary 12 flows directly into evaporator 6, when ambient temperature continues to raise, higher than 60.5 ℃, now system pressure will reach 3.2MPa, secondary high-pressure switch 3 disconnects, control system is after receiving signal, cut off compressor 1 power supply, a/c system quits work, with protection compressor 1, in normally-pressured neighbor, move, avoid compressor 1 overload scaling loss.By by passage 14 and the design to bypass capillary 12 length, caliber are set, and coordinate the break-make of one-level high-pressure switch 2 and secondary high-pressure switch 3, can make air-conditioning unit still can normally move when ambient temperature is 60.5 ℃, the requirement of 45 ℃ in TB/T 1804, meets the specific (special) requirements of railcar.The present invention can guarantee the safe in operation of air-conditioning unit, have simple in structure, can adapt to compared with high ambient temperature and lower-cost advantage.
Claims (5)
1. an air-conditioning unit, mainly comprises air conditioner casing, compressor (1), condenser (4), condensation fan (5), evaporator (6) and evaporation fan (7), described compressor (1), condenser (4), condensation fan (5), evaporator (6) and evaporation fan (7) are all fixed in air conditioner casing, compressor (1), condenser (4), evaporator (6) is connected by medium pipeline successively with compressor (1), medium pipeline between condenser (4) and evaporator (6) is provided with capillary tub (10), low pressure switch (9) is arranged on the medium pipeline between evaporator (6) and compressor (1), it is characterized in that: also comprise a bypass duct (14), bypass solenoid valve (11), control one-level high-pressure switch (2) and/or the coolant-temperature switch of bypass solenoid valve (11), the entrance point of described bypass duct (14) and compressor (1), pipeline between condenser (4) communicates, the exit end of described bypass duct (14) and condenser (4), pipeline between evaporator (6) communicates, and it is upper that described bypass solenoid valve (11) is arranged on bypass duct (14), and described one-level high-pressure switch (2) is arranged on the medium pipeline between compressor (1) and bypass duct (14) entrance point.
2. a kind of air-conditioning unit according to claim 1, it is characterized in that: comprise one-level high-pressure switch (2) and secondary high-pressure switch (3), described secondary high-pressure switch (3) and one-level high-pressure switch (2) are set up in parallel on the medium pipeline between compressor (1) and bypass duct (14) entrance point.
3. a kind of air-conditioning unit according to claim 1, is characterized in that: on the medium pipeline between bypass solenoid valve (11) and evaporator (6), be provided with bypass capillary (12).
4. a kind of air-conditioning unit according to claim 1, is characterized in that: on the medium pipeline of condenser (4) exit end, be provided with device for drying and filtering (13).
5. a kind of air-conditioning unit according to claim 1, is characterized in that: also comprise electric heater (8), be arranged on evaporator (6) one sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310587838.0A CN103600748A (en) | 2013-11-21 | 2013-11-21 | Air-conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310587838.0A CN103600748A (en) | 2013-11-21 | 2013-11-21 | Air-conditioning unit |
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| CN103600748A true CN103600748A (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310587838.0A Pending CN103600748A (en) | 2013-11-21 | 2013-11-21 | Air-conditioning unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288520A (en) * | 2016-08-02 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of compressor oil return control device, control method and air-conditioning |
| CN106524607A (en) * | 2016-11-25 | 2017-03-22 | 广东申菱环境***股份有限公司 | Compressor high-temperature operation device |
| CN107444420A (en) * | 2017-08-07 | 2017-12-08 | 中车青岛四方车辆研究所有限公司 | Track vehicle air conditioner and its constant temperature dehumidification method |
| CN109682021A (en) * | 2018-12-13 | 2019-04-26 | 青岛海信日立空调***有限公司 | A kind of outdoor unit guard method and device, air-conditioning system |
| CN111055864A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioner of railway vehicle |
| CN111055863A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN114368403A (en) * | 2021-12-31 | 2022-04-19 | 上海科泰运输制冷设备有限公司 | High-voltage protection method and device, controller, storage medium and air conditioning unit |
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| JPH08128753A (en) * | 1994-10-31 | 1996-05-21 | Sanyo Electric Co Ltd | Heating method for air conditioner |
| CN2837745Y (en) * | 2005-09-10 | 2006-11-15 | 海尔集团公司 | Air conditioner with decompression protection mechanism |
| CN1908556A (en) * | 2006-08-31 | 2007-02-07 | 黄麦 | Refrigerating air conditioner in high temperature working condition |
| CN203651780U (en) * | 2013-11-21 | 2014-06-18 | 石家庄国祥运输设备有限公司 | Air conditioning unit |
-
2013
- 2013-11-21 CN CN201310587838.0A patent/CN103600748A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08128753A (en) * | 1994-10-31 | 1996-05-21 | Sanyo Electric Co Ltd | Heating method for air conditioner |
| CN2837745Y (en) * | 2005-09-10 | 2006-11-15 | 海尔集团公司 | Air conditioner with decompression protection mechanism |
| CN1908556A (en) * | 2006-08-31 | 2007-02-07 | 黄麦 | Refrigerating air conditioner in high temperature working condition |
| CN203651780U (en) * | 2013-11-21 | 2014-06-18 | 石家庄国祥运输设备有限公司 | Air conditioning unit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288520A (en) * | 2016-08-02 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of compressor oil return control device, control method and air-conditioning |
| CN106524607A (en) * | 2016-11-25 | 2017-03-22 | 广东申菱环境***股份有限公司 | Compressor high-temperature operation device |
| CN107444420A (en) * | 2017-08-07 | 2017-12-08 | 中车青岛四方车辆研究所有限公司 | Track vehicle air conditioner and its constant temperature dehumidification method |
| CN109682021A (en) * | 2018-12-13 | 2019-04-26 | 青岛海信日立空调***有限公司 | A kind of outdoor unit guard method and device, air-conditioning system |
| CN109682021B (en) * | 2018-12-13 | 2021-05-14 | 青岛海信日立空调***有限公司 | Outdoor unit protection method and device and air conditioning system |
| CN111055864A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioner of railway vehicle |
| CN111055863A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN111055863B (en) * | 2019-10-18 | 2021-02-23 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN114368403A (en) * | 2021-12-31 | 2022-04-19 | 上海科泰运输制冷设备有限公司 | High-voltage protection method and device, controller, storage medium and air conditioning unit |
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