CN110332618A - Outdoor unit, air-conditioning system and control method with continuous heating function - Google Patents
Outdoor unit, air-conditioning system and control method with continuous heating function Download PDFInfo
- Publication number
- CN110332618A CN110332618A CN201910636877.2A CN201910636877A CN110332618A CN 110332618 A CN110332618 A CN 110332618A CN 201910636877 A CN201910636877 A CN 201910636877A CN 110332618 A CN110332618 A CN 110332618A
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- China
- Prior art keywords
- communication port
- heat exchanger
- valve
- compressor
- outdoor unit
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
Abstract
The present invention provides a kind of outdoor unit with continuous heating function, air-conditioning system and control method.Outdoor unit includes compressor, First Heat Exchanger, the second heat exchanger, the first reversal valve, the second reversal valve and two throttling sets, and the First Heat Exchanger has the first state that one end is connect with the exhaust outlet of the compressor and the other end is connect with first connecting tube and the second state that one end is connect with the air entry of the compressor and the other end is connect with first connecting tube.Outdoor unit, air-conditioning system and control method provided by the invention with continuous heating function; by the way that two heat exchangers are arranged; during air-conditioner outdoor unit enters defrosting; a part of high temperature refrigerant can enter interior machine; realize that interior machine does not shut down lasting heating when outer machine defrost; to strong guarantee unit heating capacity, the leaving air temp and comfort of indoor are kept.
Description
Technical field
The present invention relates to airhandling equipment technical field, especially a kind of outdoor unit with continuous heating function, sky
Adjusting system and control method.
Background technique
It is current air conditioner industry common problem, air-conditioning room in heating process that multi-gang air-conditioner, which heats defrost,
To a certain extent, unit needs to be switched to refrigeration mode and defrosts to outdoor unit for outer machine frosting, and defrosting process chamber machine switchs to
Low pressure evaporation side can not continue to heat, so that room temperature can reduce to a certain extent, generate to indoor environment temperature very big
Fluctuation, defrosting process needs the regular hour, and compressor of air conditioner needs to undergo following several stages during primary defrosting:
Heating operation → reduction running frequency preparation defrosting → entering defrosting stage raising frequency to defrost → reduces frequency preparation and turns heating operation
→ raising frequency continues heating operation.This process causes fluctuations in indoor temperature, influences to heat comfort, while high frequent lifting frequency
It is power-consuming, and air-conditioning four-way valve frequently commutates, and influences service life.
Summary of the invention
The technical problem for causing comfort low to solve fluctuations in indoor temperature during defrost, and a kind of utilization is provided
The difference defrost of two heat exchangers guarantees outdoor unit, air-conditioning system and the control with continuous heating function that indoor persistently heats
Method processed.
A kind of outdoor unit further includes compressor, first including the first connecting tube and the second connecting tube being connected to indoor unit
Heat exchanger, the second heat exchanger, the first reversal valve, the second reversal valve and two throttling sets, the First Heat Exchanger have one end
It is connect with the exhaust outlet of the compressor and first state that the other end is connect with first connecting tube and one end and the pressure
The second state that the air entry of contracting machine connects and the other end is connect with first connecting tube, first reversal valve is with making institute
State the first position and make second heat exchanger and the compressor that the second heat exchanger is connect with the exhaust outlet of the compressor
Air entry connection the second position, second reversal valve have make the compressor exhaust outlet and second connecting tube
The third place of connection and the 4th position for connecting the air entry of the compressor with second connecting tube, described second changes
Hot device is connected to by a throttling set with first connecting tube.
First reversal valve is the first four-way valve, the a1 communication port of first four-way valve and the exhaust of the compressor
Mouth connection, a2 communication port are connect with the air entry of the compressor, and a3 communication port is connect with second heat exchanger, a4 communication port
Closing setting is connected to by throttle mechanism with the air entry of the compressor, and at the first position, a1 communication port and
A3 communication port is connected to and a2 communication port is connected to a4 communication port, and in the second position, a1 communication port is connected to a4 communication port
And a2 communication port is connected to a3 communication port.
Second reversal valve is the second four-way valve, the b1 communication port of second four-way valve and the exhaust of the compressor
Mouth connection, b2 communication port are connect with second connecting tube, and b3 communication port is connect with the air entry of the compressor, b4 communication port
Closing setting is connected to by throttle mechanism with the air entry of the compressor, and in the third place, b1 communication port and
B2 communication port is connected to and b3 communication port is connected to b4 communication port, and at four position, b1 communication port is connected to b4 communication port
And b2 communication port is connected to b3 communication port.
The outdoor unit further includes valve module, and the first communication port of the valve module is connect with the First Heat Exchanger, the
Two communication ports are connected to the air entry of the compressor, and third connecting mouth is connected to the exhaust outlet of the compressor, and described
When first state, first communication port is connect with the third connecting mouth, in second state, first communication port
It is connected to second communication port.
The valve module includes high-pressure solenoid valve and low-voltage solenoid valve, and one end of the high-pressure solenoid valve forms the valve group
First communication port of part, the other end form the third connecting mouth of the valve module, one end of the low-voltage solenoid valve and described the
The connection of one communication port, the other end form the second communication port of the valve module.
The valve module further includes low pressure bypass solenoid valve, and one end of the low pressure bypass solenoid valve is connected to described first
Mouth connection, the other end are connected to second communication port.
The high-pressure solenoid valve is high pressure two-port valve, and the low-voltage solenoid valve is low pressure two-port valve.
The outdoor unit includes heat-exchanger rig, and the part heat-exchanger rig forms the First Heat Exchanger, remainder institute
It states heat exchanger and forms second heat exchanger.
The outdoor unit further includes oil eliminator, and the exhaust outlet of the air inlet of the oil eliminator and the compressor connects
Logical, oil export is connected to the oil return opening of the compressor, gas outlet and the First Heat Exchanger, first reversal valve and described
Any two or three connections in second connecting tube.
The outdoor unit includes refrigeration mode, heating mode, First Heat Exchanger defrost pattern and the second heat exchanger defrosting mould
Formula:
In the refrigeration mode, the First Heat Exchanger is in the first state, and first reversal valve is in institute
First position is stated, second reversal valve is in the 4th position；
In the heating mode, the First Heat Exchanger is in second state, and first reversal valve is in institute
The second position is stated, second reversal valve is in the third place；
In the First Heat Exchanger defrost pattern, the First Heat Exchanger is in the first state, and described first changes
It is in the second position to valve, second reversal valve is in the third place；
In the second heat exchanger defrosting mode, the First Heat Exchanger is in second state, and described first changes
It is in the first position to valve, second reversal valve is in the third place.
A kind of air-conditioning system, including above-mentioned outdoor unit.
The air-conditioning system further includes multiple indoor units, and all indoor units are by first connecting tube and described
Second connecting tube is connected to the outdoor unit, and all indoor units are arranged in parallel.
A kind of control method of above-mentioned outdoor unit, comprising:
Refrigeration mode, the First Heat Exchanger switch to the first state, and first reversal valve switches to described
One position, second reversal valve switch to the 4th position；
Heating mode, the First Heat Exchanger switch to second state, and first reversal valve switches to described
Two positions, second reversal valve switch to the third place.
The control method further include: First Heat Exchanger defrost pattern, the First Heat Exchanger switch to first shape
State, first reversal valve switch to the second position, and second reversal valve switches to the third place.
The control method further include: the second heat exchanger defrosting mode, the First Heat Exchanger switch to second shape
State, first reversal valve switch to the first position, and second reversal valve switches to the third place.
Outdoor unit, air-conditioning system and control method provided by the invention with continuous heating function passes through setting two
Heat exchanger, during air-conditioner outdoor unit enters defrosting, a part of high temperature refrigerant can enter interior machine, realize interior machine when outer machine defrost
Lasting heating is not shut down, so that strong guarantee unit heating capacity, keeps the leaving air temp and comfort of indoor.
Detailed description of the invention
Fig. 1 is the embodiment of the outdoor unit provided by the invention with continuous heating function, air-conditioning system and control method
Air-conditioning system structural schematic diagram；
Fig. 2 is the embodiment of the outdoor unit provided by the invention with continuous heating function, air-conditioning system and control method
Outdoor unit refrigerant flow graph in refrigeration mode；
Fig. 3 is the embodiment of the outdoor unit provided by the invention with continuous heating function, air-conditioning system and control method
Outdoor unit be in the refrigerant flow graph of heating mode；
Fig. 4 is the embodiment of the outdoor unit provided by the invention with continuous heating function, air-conditioning system and control method
Outdoor unit be in the refrigerant flow graph of First Heat Exchanger defrost pattern；
Fig. 5 is the embodiment of the outdoor unit provided by the invention with continuous heating function, air-conditioning system and control method
Outdoor unit be in the refrigerant flow graph of the second heat exchanger defrosting mode；
In figure:
1, the first connecting tube；2, the second connecting tube；3, compressor；41, First Heat Exchanger；42, the second heat exchanger；51,
One reversal valve；52, the second reversal valve；6, throttling set；7, valve module；71, high-pressure solenoid valve；72, low-voltage solenoid valve；73, low
Press bypass solenoid valve.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments
The present invention is further elaborated.It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not
For limiting the present invention.
Outdoor unit as shown in Figures 1 to 5, including the first connecting tube 1 and the second connecting tube 2 being connected to indoor unit, also
Including compressor 3, First Heat Exchanger 41, the second heat exchanger 42, the first reversal valve 51, the second reversal valve 52 and two throttling sets
6, there is the First Heat Exchanger 41 one end to connect with the exhaust outlet of the compressor 3 and the other end and first connecting tube 1
The first state of connection and one end are connect with the air entry of the compressor 3 and the other end connect with first connecting tube 1
Second state, first reversal valve 51 have make that second heat exchanger 42 connect with the exhaust outlet of the compressor 3 the
One position and the second position for connecting second heat exchanger 42 with the air entry of the compressor 3, second reversal valve
52 suctions that there is the third place for being connected to the exhaust outlet of the compressor 3 with second connecting tube 2 and make the compressor 3
The 4th position that port is connect with second connecting tube 2, second heat exchanger 42 pass through a throttling set 6 and institute
The connection of the first connecting tube 1 is stated, First Heat Exchanger 41 and the second heat exchanger 42 are set, so that in refrigeration mode or heating mode, two
A heat exchanger can guarantee heat exchange efficiency, and when needing to carry out defrost, make one in First Heat Exchanger 41 and the second heat exchanger 42
A holding heating, and another is passed through high temperature refrigerant and carries out defrost, to realize that indoor does not shut down heating and carries out defrost
Purpose.
First reversal valve 51 is the first four-way valve, the a1 communication port of first four-way valve and the compressor 3
Exhaust outlet connection, a2 communication port are connect with the air entry of the compressor 3, and a3 communication port is connect with second heat exchanger 42,
A4 communication port closing setting is connected to by throttle mechanism with the air entry of the compressor 3, and at the first position, a1
Communication port is connected to a3 communication port and a2 communication port is connected to a4 communication port, is passed through compressor 3 in the second heat exchanger 42 at this time
Exhaust is condensed, and in the second position, a1 communication port is connected to a4 communication port and a2 communication port is connected to a3 communication port,
The refrigerant received after the throttling of throttling set 6 in the second heat exchanger 42 at this time is evaporated.
Second reversal valve 52 is the second four-way valve, the b1 communication port of second four-way valve and the compressor 3
Exhaust outlet connection, b2 communication port are connect with second connecting tube 2, and b3 communication port is connect with the air entry of the compressor 3, b4
Communication port closing setting is connected to by throttle mechanism with the air entry of the compressor 3, and in the third place, b1 connects
Port is connected to b2 communication port and b3 communication port is connected to b4 communication port, at this point, the exhaust of compressor 3 is directly fed to interior
Side, at four position, b1 communication port is connected to b4 communication port and b2 communication port is connected to b3 communication port, at this time indoor
Refrigerant flow into compressor 3 air entry.
The outdoor unit further includes valve module 7, and the first communication port of the valve module 7 and the First Heat Exchanger 41 connect
It connecing, the second communication port is connected to the air entry of the compressor 3, and third connecting mouth is connected to the exhaust outlet of the compressor 3, and
In the first state, first communication port is connect with the third connecting mouth, at this point, being passed through pressure in First Heat Exchanger 41
The exhaust of contracting machine 3 is condensed, and in second state, first communication port is connected to second communication port, at this time
First Heat Exchanger 41 receives to be evaporated by the refrigerant of throttling set 6.
The valve module 7 includes high-pressure solenoid valve 71 and low-voltage solenoid valve 72, and one end of the high-pressure solenoid valve 71 is formed
First communication port of the valve module 7, the other end form the third connecting mouth of the valve module 7, the low-voltage solenoid valve 72
One end is connected to first communication port, and the other end forms the second communication port of the valve module 7.
The valve module 7 further includes low pressure bypass solenoid valve 73, one end of the low pressure bypass solenoid valve 73 and described the
The connection of one communication port, the other end are connected to second communication port.
The high-pressure solenoid valve 71 is high pressure two-port valve, and the low-voltage solenoid valve 72 is low pressure two-port valve.
The outdoor unit includes heat-exchanger rig, and the part heat-exchanger rig forms the First Heat Exchanger 41, remainder
The heat exchanger forms second heat exchanger 42, it is preferred that First Heat Exchanger 41, lower part are formed at the top of the heat-exchanger rig
Form the second heat exchanger 42.
The outdoor unit further includes oil eliminator, and the exhaust outlet of the air inlet of the oil eliminator and the compressor 3 connects
Logical, oil export is connected to the oil return opening of the compressor 3, gas outlet and the First Heat Exchanger 41, first reversal valve 51
With in second connecting tube 2 any two or three be connected to.
The outdoor unit includes refrigeration mode, heating mode, First Heat Exchanger defrost pattern and the second heat exchanger defrosting mould
Formula:
In the refrigeration mode, the First Heat Exchanger 41 is in the first state, at first reversal valve 51
In the first position, second reversal valve 52 is in the 4th position, at this point, the exhaust of compressor 3 respectively enters
One heat exchanger 41 and the second heat exchanger 42, and enter indoor after the throttling of corresponding throttling set 6 and freeze, indoor
Refrigerant return completed into the air entry of compressor 3 circulation；
In the heating mode, the First Heat Exchanger 41 is in second state, at first reversal valve 51
In the second position, second reversal valve 52 is in the third place, and the exhaust of compressor 3 enters the room side system at this time
Heat, and respectively enter in First Heat Exchanger 41 and the second heat exchanger 42 and exchange heat after the throttling of throttling set 6, finally it is back to pressure
The air entry of contracting machine 3 completes circulation；
In the First Heat Exchanger defrost pattern, the First Heat Exchanger 41 is in the first state, and described first
Reversal valve 51 is in the second position, and second reversal valve 52 is in the third place, be partially compressed the exhaust of machine 3 into
Enter indoor to be heated, and enters in the second heat exchanger 42 suction for being exchanged heat and being back to compressor 3 by throttling set 6
Port, the exhaust of remainder compressor 3, which enters, carries out defrost in First Heat Exchanger 41, and enters after throttling set 6 the
Heat exchange is back to the air entry of compressor 3 in two heat exchangers 42, in the case where guaranteeing that indoor heats, carries out First Heat Exchanger
41 defrost；
In the second heat exchanger defrosting mode, the First Heat Exchanger 41 is in second state, and described first
Reversal valve 51 is in the first position, and second reversal valve 52 is in the third place, be partially compressed the exhaust of machine 3 into
Enter indoor to be heated, and enters in First Heat Exchanger 41 suction for being exchanged heat and being back to compressor 3 by throttling set 6
Port, the exhaust of remainder compressor 3, which enters in the second heat exchanger 42, carries out defrost, and enters after throttling set 6 the
Heat exchange is back to the air entry of compressor 3 in one heat exchanger 41, in the case where guaranteeing that indoor heats, carries out the second heat exchanger
42 defrost.
A kind of air-conditioning system, including above-mentioned outdoor unit.
The air-conditioning system further includes multiple indoor units, and all indoor units pass through first connecting tube 1 and institute
It states the second connecting tube 2 to be connected to the outdoor unit, and all indoor units are arranged in parallel.
A kind of control method of above-mentioned outdoor unit, comprising:
Refrigeration mode, the First Heat Exchanger 41 switch to the first state, and first reversal valve 51 switches to institute
First position is stated, second reversal valve 52 switches to the 4th position, and the exhaust of compressor 3 respectively enters First Heat Exchanger
41 and second heat exchanger 42, and enter indoor after the throttling of corresponding throttling set 6 and freeze, the refrigerant of indoor returns
It flow in the air entry of compressor 3 and completes circulation；
Heating mode, the First Heat Exchanger 41 switch to second state, and first reversal valve 51 switches to institute
The second position is stated, second reversal valve 52 switches to the third place, and the exhaust of compressor 3 enters the room side heating, and
It respectively enters in First Heat Exchanger 41 and the second heat exchanger 42 and exchanges heat after the throttling of throttling set 6, be finally back to compressor 3
Air entry complete circulation.
The control method further include: First Heat Exchanger defrost pattern, the First Heat Exchanger 41 switch to described first
State, first reversal valve 51 switch to the second position, and second reversal valve 52 switches to the third place, portion
The exhaust of partial compression machine 3 enters the room side and is heated, and is entered in the second heat exchanger 42 by throttling set 6 and exchanged heat simultaneously
It is back to the air entry of compressor 3, the exhaust of remainder compressor 3, which enters, carries out defrost in First Heat Exchanger 41, and passes through
Enter the air entry that heat exchange in the second heat exchanger 42 is back to compressor 3 after throttling set 6, guarantees the case where indoor heats
Under, carry out the defrost of First Heat Exchanger 41.
The control method further include: the second heat exchanger defrosting mode, the First Heat Exchanger 41 switch to described second
State, first reversal valve 51 switch to the first position, and second reversal valve 52 switches to the third place, portion
The exhaust of partial compression machine 3 enters the room side and is heated, and is entered in First Heat Exchanger 41 by throttling set 6 and exchanged heat simultaneously
It is back to the air entry of compressor 3, the exhaust of remainder compressor 3, which enters in the second heat exchanger 42, carries out defrost, and passes through
Enter the air entry that heat exchange in First Heat Exchanger 41 is back to compressor 3 after throttling set 6, guarantees the case where indoor heats
Under, carry out the defrost of the second heat exchanger 42.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (15)
1. a kind of outdoor unit, including the first connecting tube (1) and the second connecting tube (2) being connected to indoor unit, it is characterised in that: also
Including compressor (3), First Heat Exchanger (41), the second heat exchanger (42), the first reversal valve (51), the second reversal valve (52) and two
A throttling set (6), the First Heat Exchanger (41) have one end connect with the exhaust outlet of the compressor (3) and the other end and
The first state of first connecting tube (1) connection and one end are connect with the air entry of the compressor (3) and the other end and institute
State the first connecting tube (1) connection the second state, first reversal valve (51) have make second heat exchanger (42) and institute
It states the first position of the exhaust outlet connection of compressor (3) and makes the air-breathing of second heat exchanger (42) and the compressor (3)
The second position of mouth connection, second reversal valve (52), which has, connect the exhaust outlet of the compressor (3) with described second
The third place of pipe (2) connection and make that the air entry of the compressor (3) connect with second connecting tube (2) the 4th
It sets, second heat exchanger (42) is connected to by a throttling set (6) with first connecting tube (1).
2. outdoor unit according to claim 1, it is characterised in that: first reversal valve (51) is the first four-way valve, institute
The a1 communication port for stating the first four-way valve is connect with the exhaust outlet of the compressor (3), the suction of a2 communication port and the compressor (3)
Port connection, a3 communication port are connect with second heat exchanger (42), and the closing of a4 communication port is arranged or passes through throttle mechanism and institute
State the air entry connection of compressor (3), and at the first position, a1 communication port be connected to a3 communication port and a2 communication port and
The connection of a4 communication port, in the second position, a1 communication port is connected to a4 communication port and a2 communication port is connected to a3 communication port.
3. outdoor unit according to claim 1 or 2, it is characterised in that: second reversal valve (52) is the second four-way valve,
The b1 communication port of second four-way valve is connect with the exhaust outlet of the compressor (3), b2 communication port and second connecting tube
(2) connect, b3 communication port connect with the air entry of the compressor (3), b4 communication port closing setting or pass through throttle mechanism and
The air entry of the compressor (3) is connected to, and in the third place, b1 communication port is connected to b2 communication port and b3 communication port
It is connected to b4 communication port, at four position, b1 communication port is connected to b4 communication port and b2 communication port and b3 communication port connect
It is logical.
4. outdoor unit according to claim 1, it is characterised in that: the outdoor unit further includes valve module (7), the valve group
First communication port of part (7) is connect with the First Heat Exchanger (41), and the air entry of the second communication port and the compressor (3) connects
Logical, third connecting mouth is connected to the exhaust outlet of the compressor (3), and in the first state, first communication port and
The third connecting mouth connection, in second state, first communication port is connected to second communication port.
5. outdoor unit according to claim 4, it is characterised in that: the valve module (7) include high-pressure solenoid valve (71) and
One end of low-voltage solenoid valve (72), the high-pressure solenoid valve (71) forms the first communication port of the valve module (7), other end shape
At the third connecting mouth of the valve module (7), one end of the low-voltage solenoid valve (72) is connected to first communication port, another
End forms the second communication port of the valve module (7).
6. outdoor unit according to claim 5, it is characterised in that: the valve module (7) further includes low pressure bypass solenoid valve
(73), one end of the low pressure bypass solenoid valve (73) is connected to first communication port, the other end and second communication port
Connection.
7. outdoor unit according to claim 5, it is characterised in that: the high-pressure solenoid valve (71) is high pressure two-port valve, institute
Stating low-voltage solenoid valve (72) is low pressure two-port valve.
8. outdoor unit according to claim 1, it is characterised in that: the outdoor unit includes heat-exchanger rig, is changed described in part
Thermal is formed the First Heat Exchanger (41), and heat exchanger described in remainder forms second heat exchanger (42).
9. outdoor unit according to claim 8, it is characterised in that: the outdoor unit further includes oil eliminator, the oil
It is connected to from the air inlet of device with the exhaust outlet of the compressor (3), oil export is connected to the oil return opening of the compressor (3), out
Port and the First Heat Exchanger (41), first reversal valve (51) and any two in second connecting tube (2) or
Three connections.
10. outdoor unit according to claim 1, it is characterised in that: the outdoor unit include refrigeration mode, heating mode,
First Heat Exchanger defrost pattern and the second heat exchanger defrosting mode:
In the refrigeration mode, the First Heat Exchanger (41) is in the first state, at first reversal valve (51)
In the first position, second reversal valve (52) is in the 4th position；
In the heating mode, the First Heat Exchanger (41) is in second state, at first reversal valve (51)
In the second position, second reversal valve (52) is in the third place；
In the First Heat Exchanger defrost pattern, the First Heat Exchanger (41) is in the first state, and described first changes
It is in the second position to valve (51), second reversal valve (52) is in the third place；
In the second heat exchanger defrosting mode, the First Heat Exchanger (41) is in second state, and described first changes
It is in the first position to valve (51), second reversal valve (52) is in the third place.
11. a kind of air-conditioning system, it is characterised in that: including outdoor unit described in any one of claims 1 to 10.
12. air-conditioning system according to claim 11, it is characterised in that: the air-conditioning system further includes multiple indoor units,
All indoor units are connected to by first connecting tube (1) and second connecting tube (2) with the outdoor unit, and institute
There is the indoor unit to be arranged in parallel.
13. a kind of control method of outdoor unit described in any one of claims 1 to 10, it is characterised in that: include:
Refrigeration mode, the First Heat Exchanger (41) switch to the first state, and first reversal valve (51) switches to institute
First position is stated, second reversal valve (52) switches to the 4th position；
Heating mode, the First Heat Exchanger (41) switch to second state, and first reversal valve (51) switches to institute
The second position is stated, second reversal valve (52) switches to the third place.
14. control method according to claim 13, it is characterised in that: the control method further include:
First Heat Exchanger defrost pattern, the First Heat Exchanger (41) switch to the first state, first reversal valve
(51) second position is switched to, second reversal valve (52) switches to the third place.
15. control method according to claim 13, it is characterised in that: the control method further include:
Second heat exchanger defrosting mode, the First Heat Exchanger (41) switch to second state, first reversal valve
(51) first position is switched to, second reversal valve (52) switches to the third place.
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