CN203651780U - Air conditioning unit - Google Patents
Air conditioning unit Download PDFInfo
- Publication number
- CN203651780U CN203651780U CN201320737913.2U CN201320737913U CN203651780U CN 203651780 U CN203651780 U CN 203651780U CN 201320737913 U CN201320737913 U CN 201320737913U CN 203651780 U CN203651780 U CN 203651780U
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- Prior art keywords
- compressor
- evaporator
- pressure switch
- pipeline
- conditioning unit
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 27
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 230000008020 evaporation Effects 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses an air conditioning unit, and relates to the technical field of air conditioning equipment. The air conditioning unit mainly comprises an air conditioning machine shell, a compressor, a condenser, a condensate fan, an evaporator, an evaporation fan, a by-pass pipeline, a by-pass electromagnetic valve, a primary high-voltage pressure switch and/or a temperature control switch. The inlet end of the by-pass pipeline is communicated with an outlet medium pipeline of the compressor, the outlet end of the by-pass pipeline is communicated with a medium pipeline of the evaporator, the by-pass electromagnetic valve is arranged on the by-pass pipeline, and the primary high-voltage pressure switch is arranged on a medium pipeline of an outlet of the compressor. When the environment temperature is higher than 52 DEG C, and the system pressure is larger than 2.9 MPa, the primary high-voltage pressure switch is disconnected, meanwhile, the by-pass electromagnetic valve is turned on, or the temperature control switch controls the by-pass electromagnetic valve to be turned on, and part of refrigerant media pass through the by-pass pipeline to directly flow in the evaporator to protect normal operation of the compressor. The air conditioning unit has the advantages of being simple in structure, and capable of adapting to high environment temperatures.
Description
Technical field
The utility model 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, in car, send hot blast by evaporation fan again, automatically regulate the air themperature in car by control system, 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.
Utility model content
Technical problem to be solved in the utility model be to provide a kind of 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.
For solving the problems of the technologies described above, technical solution adopted in the utility model 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 receiving after signal, bypass solenoid valve is opened, or opening by coolant-temperature switch control bypass solenoid valve, 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 receiving after signal, cut off compressor power, a/c system quits work, move in normally-pressured neighbor with protection compressor, avoid compressor overload scaling loss, the effect that bypass capillary can play to the part medium of shunting reducing pressure by regulating flow is set on the medium pipeline between bypass solenoid valve and evaporator, 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.The utlity model has 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.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of an embodiment of the utility model;
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 utility model is described in further detail.
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 receiving after signal, bypass solenoid valve 11 is opened, or opening by coolant-temperature switch control bypass solenoid valve, 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 be to the part medium of shunting away entering the effect of carrying out reducing pressure by regulating flow before evaporator 6, 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 receiving after signal, cut off compressor 1 power supply, a/c system quits work, move in normally-pressured neighbor with protection compressor 1, avoid compressor 1 scaling loss that overloads, 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 receiving after signal, bypass solenoid valve 11 is opened, or opening by coolant-temperature switch control bypass solenoid valve 11, part of refrigerant medium shunt enters bypass duct 14, 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 receiving after signal, cut off compressor 1 power supply, a/c system quits work, move in normally-pressured neighbor with protection compressor 1, avoid compressor 1 scaling loss that overloads.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 in the time that ambient temperature is 60.5 ℃, the requirement of 45 ℃ in TB/T 1804, meets the specific (special) requirements of railcar.The utility model 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 |
|---|---|---|---|
| CN201320737913.2U CN203651780U (en) | 2013-11-21 | 2013-11-21 | Air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320737913.2U CN203651780U (en) | 2013-11-21 | 2013-11-21 | Air conditioning unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203651780U true CN203651780U (en) | 2014-06-18 |
Family
ID=50918203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320737913.2U Expired - Fee Related CN203651780U (en) | 2013-11-21 | 2013-11-21 | Air conditioning unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203651780U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600748A (en) * | 2013-11-21 | 2014-02-26 | 石家庄国祥运输设备有限公司 | Air-conditioning unit |
| CN108870690A (en) * | 2018-05-24 | 2018-11-23 | 广东美的制冷设备有限公司 | Compressor, air conditioner, progress control method and computer readable storage medium |
| CN109425141A (en) * | 2018-12-06 | 2019-03-05 | 中车大连机车研究所有限公司 | A kind of carbon dioxide air-conditioning and pressure control and guard method |
-
2013
- 2013-11-21 CN CN201320737913.2U patent/CN203651780U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600748A (en) * | 2013-11-21 | 2014-02-26 | 石家庄国祥运输设备有限公司 | Air-conditioning unit |
| CN108870690A (en) * | 2018-05-24 | 2018-11-23 | 广东美的制冷设备有限公司 | Compressor, air conditioner, progress control method and computer readable storage medium |
| CN108870690B (en) * | 2018-05-24 | 2020-05-15 | 广东美的制冷设备有限公司 | Compressor, air conditioner, operation control method, and computer-readable storage medium |
| CN109425141A (en) * | 2018-12-06 | 2019-03-05 | 中车大连机车研究所有限公司 | A kind of carbon dioxide air-conditioning and pressure control and guard method |
| WO2020113949A1 (en) * | 2018-12-06 | 2020-06-11 | 中车大连机车研究所有限公司 | Carbon dioxide air conditioner and pressure control and protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 |