CN106225312B - Multi-line system and its pressure release control method - Google Patents

Multi-line system and its pressure release control method Download PDF

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Publication number
CN106225312B
CN106225312B CN201610695722.2A CN201610695722A CN106225312B CN 106225312 B CN106225312 B CN 106225312B CN 201610695722 A CN201610695722 A CN 201610695722A CN 106225312 B CN106225312 B CN 106225312B
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China
Prior art keywords
pressure
preset
temperature
throttle element
pressure release
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CN201610695722.2A
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Chinese (zh)
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CN106225312A (en
Inventor
王命仁
李元阳
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Priority to CN201610695722.2A priority Critical patent/CN106225312B/en
Publication of CN106225312A publication Critical patent/CN106225312A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2525—Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a kind of multi-line system and its pressure release control methods, which comprises when multi-line system is run with heating mode, obtains the delivery temperature of compressor or the pressure at expulsion of compressor；Judge whether delivery temperature is greater than the first preset temperature or judges whether pressure at expulsion is greater than the first preset pressure；When delivery temperature is greater than the first preset temperature or pressure at expulsion is greater than the first preset pressure, if compressor is run with preset minimum frequency and maintains the first preset time, then pressure release by-passing valve and first throttle element are controlled, so that multi-line system carries out multi gear position pressure release work.This method makes multi-line system be able to carry out the pressure release of multi gear position, realizes variable capacity and accurately control pressure release strategy, meet the pressure release demand of 0%-100% range, to guarantee the safe and reliable stable operation of system by control pressure release by-passing valve and restricting element.

Description

Multi-line system and its pressure release control method
Technical field
The present invention relates to air-conditioning technical field, in particular to the pressure release control method and one kind of a kind of multi-line system are more On-line system.
Background technique
Multi-line system can be freezed and be heated simultaneously, and applied widely, using flexible.Currently, multi-connected machine System uses large capacity compressor that will become one mainly towards the trend development of the high-power of single machine and high energy efficiency Trend.
But due to the actuation techniques barrier of the slow-speed of revolution of frequency-changeable compressor, so that compressor is limited with minimum speed, and The minimum speed of large capacity compressor, for certain small load conditions, revolving speed is still very big.Particularly with temperature outside Higher, the inside booting lesser operating condition of capacity, such as big hot condition that singly goes into operation, even if the revolving speed of large capacity compressor is limited in by system Minimum speed, the pressure for also resulting in the offer of large capacity compressor are higher than system demand pressure.
For the operating condition, the air inlet pipe and exhaust pipe of pressure release by-passing valve bypass compressor are used in the related technology.But at certain In a little situations, if opening pressure release by-passing valve, to will lead to system high pressure too low, and it is excessively high to will lead to system high pressure if being not turned on, It will appear the phenomenon that pressure release by-passing valve frequently switches at this time, cause system unstable.Moreover, when to pressure release by-passing valve type selecting, To meet most of operating conditions, the pressure relief capability for the pressure release by-passing valve being typically chosen is bigger, when pressure release by-passing valve is opened, holds very much The revolving speed for easily leading to compressor rises, and system energy consumption is caused to increase, and most electric power is on bypass gases circuit, not very Positive interaction is in heating output.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of pressure release control method of multi-line system, this method passes through Pressure release by-passing valve and restricting element are controlled, so that multi-line system is able to carry out the pressure release of multi gear position, realizes variable capacity and accurately control Pressure release strategy processed, meets the pressure release demand of 0%-100% range, to guarantee the safe and reliable stable operation of system.
It is another object of the present invention to propose a kind of multi-line system.
To achieve the goals above, one aspect of the present invention embodiment proposes a kind of pressure release controlling party of multi-line system Method, the multi-line system include outdoor unit, part flow arrangement and multiple indoor units, and the outdoor unit includes that compressor and setting exist Pressure release by-passing valve between the exhaust outlet and gas returning port of the compressor, the part flow arrangement include First Heat Exchanger, second change Hot device, first throttle element and the second restricting element, what the First Heat Exchanger was arranged in the first throttle element first changes Between the entrance of first heat exchange flow path of the outlet and second heat exchanger of hot flowpath, second restricting element is arranged in institute It states between the outlet of the first heat exchange flow path of the second heat exchanger and the entrance of the second heat exchange flow path of second heat exchanger, it is described The entrance of first heat exchange flow path of the second heat exchanger is also connected with the outlet for heating indoor unit in the multiple indoor unit, described Method the following steps are included: when the multi-line system is run with heating mode, obtain the compressor delivery temperature or The pressure at expulsion of compressor described in person；Judge whether the delivery temperature is greater than the first preset temperature or judges the exhaust Whether pressure is greater than the first preset pressure；When the delivery temperature is greater than first preset temperature or the pressure at expulsion When greater than first preset pressure, if the compressor runs with preset minimum frequency and maintains the first preset time, Then the pressure release by-passing valve and the first throttle element are controlled, so that the multi-line system carries out the pressure release of multi gear position Work.
The pressure release control method of multi-line system according to an embodiment of the present invention, is run in multi-line system with heating mode When, obtain the delivery temperature of compressor or the pressure at expulsion of compressor, judge delivery temperature whether be greater than the first preset temperature, Or judge whether pressure at expulsion is greater than the first preset pressure, when delivery temperature is greater than the first preset temperature or pressure at expulsion When greater than the first preset pressure, if compressor runs with preset minimum frequency and maintain the first preset time, to letting out Pressure by-passing valve and first throttle element are controlled, so that multi-line system carries out multi gear position pressure release work, it can to realize Varying capacity accurately controls pressure release strategy, meets the pressure release demand of 0%-100% range, guarantees that the safe and reliable of system stablizes fortune Row.
According to one embodiment of present invention, the pressure release gear of the multi-line system includes the first gear, the second gear And third gear, wherein the multi-line system is controlled such that the pressure release by-passing valve and the first throttle element Pressure release work is carried out with first gear, comprising: aperture is carried out to the first throttle element and tunes up control, and described in control Pressure release by-passing valve is in close state；After the second preset time, judge the delivery temperature whether less than the second preset temperature, Or judge the pressure at expulsion whether less than the second preset pressure, wherein it is pre- that second preset temperature is less than described first If temperature, second preset pressure is less than first preset pressure；If it is default that the delivery temperature is less than described second Temperature or the pressure at expulsion are less than second preset pressure, then control the first throttle element and keep current aperture It is constant.
According to one embodiment of present invention, when the control first throttle element keeps current aperture constant, if The delivery temperature is less than third preset temperature or the pressure at expulsion is less than third preset pressure, then to the first segment Fluid element carries out aperture and turns control down, wherein the third preset temperature is less than second preset temperature, and the third is default Pressure is less than second preset pressure.
According to one embodiment of present invention, when the control first throttle element keeps current aperture constant, if The delivery temperature is greater than first preset temperature or the pressure at expulsion is greater than first preset pressure, then continues Aperture is carried out to the first throttle element and tunes up control, wherein if the aperture of the first throttle element reaches preset Temperature is less than the 4th preset temperature before the valve of maximum opening and the first throttle element, then by the pressure release by-passing valve and The first throttle element is controlled such that the multi-line system carries out pressure release work with the third gear.
According to one embodiment of present invention, after second preset time, if the delivery temperature is more than or equal to Second preset temperature and the pressure at expulsion are more than or equal to second preset pressure, then continue to the first throttle member Part carries out aperture and tunes up control, until when temperature reaches four preset temperatures before the valve of the first throttle element, by institute It states pressure release by-passing valve and the first throttle element is controlled such that the multi-line system is let out with second gear Press work.
According to one embodiment of present invention, the pressure release by-passing valve and the first throttle element are controlled such that The multi-line system carries out pressure release work with second gear, comprising: and it is in the open state to control the pressure release by-passing valve, And it controls the first throttle element and is in close state.
According to one embodiment of present invention, after third preset time, it is described to judge whether the delivery temperature is less than Second preset temperature or judge whether the pressure at expulsion is less than second preset pressure, wherein if the exhaust is warm Degree is less than second preset temperature or the pressure at expulsion is less than second preset pressure, then controls by the pressure release Port valve is kept it turned on；If the delivery temperature is more than or equal to second preset temperature and the pressure at expulsion is greater than etc. It is in second preset pressure, then described more by being controlled such that the pressure release by-passing valve and the first throttle element On-line system carries out pressure release work with the third gear.
According to one embodiment of present invention, when the control by-passing valve is kept it turned on, if the exhaust is warm Degree is greater than the 5th preset temperature or the running speed of the compressor is greater than the first preset rotation speed, then controls by the pressure release Port valve is closed.
According to one embodiment of present invention, the pressure release by-passing valve and the first throttle element are controlled such that The multi-line system carries out pressure release work with the third gear, comprising: and it is in the open state to control the pressure release by-passing valve, And aperture is carried out to the first throttle element and tunes up control.
According to one embodiment of present invention, after the 4th preset time, it is described to judge whether the delivery temperature is less than Second preset temperature or judge whether the pressure at expulsion is less than second preset pressure, wherein if the exhaust is warm Degree is less than second preset temperature or the pressure at expulsion is less than second preset pressure, then controls the first segment Fluid element keeps current aperture constant.
According to one embodiment of present invention, if the delivery temperature is more than or equal to second preset temperature and described Pressure at expulsion is more than or equal to second preset pressure, then continues to tune up control to first throttle element progress aperture, directly Temperature is more than or equal to the 6th preset temperature and continues the 5th preset time or until institute before to the valve of the first throttle element When stating that temperature is more than or equal to seven preset temperatures before the valve of first throttle element, controls the multi-line system and enter heating standby State.
According to one embodiment of present invention, when the control first throttle element keeps current aperture constant, if The delivery temperature is less than the third preset temperature or the pressure at expulsion is less than the third preset pressure, then to institute It states first throttle element and carries out aperture and turn control down, wherein when the aperture of the first throttle element is turned down to 0, if institute It states delivery temperature and is greater than the first preset rotation speed greater than the running speed of the 5th preset temperature or the compressor, then control institute State the closing of pressure release by-passing valve.
To achieve the goals above, a kind of multi-line system that another aspect of the present invention embodiment proposes, comprising: outdoor Machine, the outdoor unit include the pressure release by-passing valve between compressor and exhaust outlet and gas returning port that the compressor is arranged in；Point Device is flowed, the part flow arrangement includes First Heat Exchanger, the second heat exchanger, first throttle element and the second restricting element, described The outlet that the first heat exchange flow path of the First Heat Exchanger is arranged in first throttle element is changed with the first of second heat exchanger Between the entrance of hot flowpath, outlet and the institute of the first heat exchange flow path of second heat exchanger is arranged in second restricting element It states between the entrance of the second heat exchange flow path of the second heat exchanger；Multiple indoor units, the first heat exchange flow path of second heat exchanger Entrance also in the multiple indoor unit heat indoor unit outlet be connected；Control module, the control module are used for When the multi-line system is run with heating mode, the delivery temperature of the compressor or the exhaust pressure of the compressor are obtained Power, and judge whether the delivery temperature is greater than the first preset temperature or it is pre- to judge whether the pressure at expulsion is greater than first If pressure, when the delivery temperature is greater than first preset temperature or the pressure at expulsion greater than the described first default pressure When power, if the compressor runs with preset minimum frequency and maintain the first preset time, to institute if the control module It states pressure release by-passing valve and the first throttle element is controlled, so that the multi-line system carries out multi gear position pressure release work.
Multi-line system according to an embodiment of the present invention, control module are obtained when multi-line system is run with heating mode Take the delivery temperature of compressor or the pressure at expulsion of compressor, and judge delivery temperature whether be greater than the first preset temperature or Person judges whether pressure at expulsion is greater than the first preset pressure, when delivery temperature is big greater than the first preset temperature or pressure at expulsion When the first preset pressure, if compressor runs with preset minimum frequency and maintain the first preset time, if control module Pressure release by-passing valve and first throttle element are controlled, so that multi-line system carries out multi gear position pressure release work, to realize Variable capacity accurately controls pressure release strategy, meets the pressure release demand of 0%-100% range, guarantees the safe and reliable stabilization of system Operation.
According to one embodiment of present invention, the pressure release gear of the multi-line system includes the first gear, the second gear And third gear, wherein the control module is controlled such that institute to the pressure release by-passing valve and the first throttle element When stating multi-line system with first gear progress pressure release work, wherein the control module is to the first throttle element It carries out aperture and tunes up control, and control the pressure release by-passing valve and be in close state；After the second preset time, the row is judged Whether whether temperature degree less than the second preset temperature or judge the pressure at expulsion less than the second preset pressure, wherein described Second preset temperature is less than first preset temperature, and second preset pressure is less than first preset pressure；If institute It states delivery temperature and is less than second preset pressure, the control less than second preset temperature or the pressure at expulsion Module then controls the first throttle element and keeps current aperture constant.
According to one embodiment of present invention, the control module is controlling the current aperture of the first throttle element holding It is described if the delivery temperature is less than third preset temperature or the pressure at expulsion is less than third preset pressure when constant Control module then carries out aperture to the first throttle element and turns control down, wherein the third preset temperature is less than described the Two preset temperatures, the third preset pressure are less than second preset pressure.
According to one embodiment of present invention, the control module is controlling the current aperture of the first throttle element holding When constant, if the delivery temperature is greater than first preset temperature or the pressure at expulsion is greater than described first and presets Pressure, the control module then continue to tune up control to first throttle element progress aperture, wherein if the first segment Temperature is less than the 4th preset temperature, institute before the aperture of fluid element reaches the valve of preset maximum opening and the first throttle element Control module is stated then by being controlled such that the multi-line system to the pressure release by-passing valve and the first throttle element Pressure release work is carried out with the third gear.
According to one embodiment of present invention, after second preset time, if the delivery temperature is more than or equal to Second preset temperature and the pressure at expulsion are more than or equal to second preset pressure, and the control module then continues to institute It states first throttle element progress aperture and tunes up control, until temperature reaches the 4th preset temperature before the valve of the first throttle element When, by being controlled such that the multi-line system with described second the pressure release by-passing valve and the first throttle element Gear carries out pressure release work.
According to one embodiment of present invention, the control module is to the pressure release by-passing valve and the first throttle element When being controlled such that the multi-line system carries out pressure release work with second gear, wherein the control module control The pressure release by-passing valve is in the open state, and controls the first throttle element and be in close state.
According to one embodiment of present invention, after third preset time, the control module judges the delivery temperature Whether it is less than second preset temperature or judges whether the pressure at expulsion is less than second preset pressure, wherein such as Delivery temperature described in fruit is less than second preset temperature or the pressure at expulsion is less than second preset pressure, described Control module then controls the pressure release by-passing valve and keeps it turned on；If it is default that the delivery temperature is more than or equal to described second Temperature and the pressure at expulsion are more than or equal to second preset pressure, and the control module is then by the pressure release by-passing valve It is controlled such that the multi-line system carries out pressure release work with the third gear with the first throttle element.
According to one embodiment of present invention, the control module is when the control by-passing valve is kept it turned on, such as Delivery temperature described in fruit is greater than the 5th preset temperature or the running speed of the compressor is greater than the first preset rotation speed, described Control module then controls the pressure release by-passing valve and closes.
According to one embodiment of present invention, the control module is to the pressure release by-passing valve and the first throttle element When being controlled such that the multi-line system carries out pressure release work with the third gear, wherein the control module control The pressure release by-passing valve is in the open state, carries out aperture to the first throttle element and tunes up control.
According to one embodiment of present invention, after the 4th preset time, it is described to judge whether the delivery temperature is less than Second preset temperature or judge whether the pressure at expulsion is less than second preset pressure, wherein if the exhaust is warm Degree is less than second preset temperature or the pressure at expulsion is less than second preset pressure, and the control module is then controlled Making the first throttle element keeps current aperture constant.
According to one embodiment of present invention, if the delivery temperature is more than or equal to second preset temperature and described Pressure at expulsion is more than or equal to second preset pressure, and the control module then continues to carry out aperture to the first throttle element Control is tuned up, until temperature is more than or equal to the 6th preset temperature and continues the 5th preset time before the valve of the first throttle element Or until the first throttle element valve before temperature be more than or equal to seven preset temperatures when, control the multi-line system into Enter heating standby state.
According to one embodiment of present invention, the control module is controlling the current aperture of the first throttle element holding When constant, if the delivery temperature is less than the third preset temperature or the pressure at expulsion and presets less than the third Pressure, the control module then carry out aperture to the first throttle element and turn control down, wherein when the first throttle element Aperture when turning down to 0, if the delivery temperature is greater than the 5th preset temperature or the running speed of the compressor is greater than First preset rotation speed, the control module then control the pressure release by-passing valve and close.
Detailed description of the invention
Fig. 1 is the flow chart of the pressure release control method of multi-line system according to an embodiment of the present invention；
Fig. 2 is the schematic diagram of the pressure release control method of multi-line system according to an embodiment of the invention；
Fig. 3 is the flow chart that multi-line system according to an embodiment of the invention carries out pressure release work with the first gear；
Fig. 4 is the flow chart that multi-line system according to an embodiment of the invention carries out pressure release work with the second gear；
Fig. 5 is the flow chart that multi-line system according to an embodiment of the invention carries out pressure release work with third gear； And
Fig. 6 is the structural schematic diagram of multi-line system according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe the multi-line system proposed according to embodiments of the present invention pressure release control method and Multi-line system.
Fig. 1 is the flow chart of the pressure release control method of multi-line system according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 6, multi-line system may include outdoor unit, part flow arrangement and multiple Indoor unit.Outdoor unit includes compressor and the pressure release by-passing valve being arranged between the exhaust outlet of compressor and gas returning port.Shunt dress It sets including First Heat Exchanger, the second heat exchanger, first throttle element and the second restricting element, first throttle element is arranged first Between the entrance of first heat exchange flow path of the outlet and the second heat exchanger of the first heat exchange flow path of heat exchanger, the second restricting element is set It sets between the entrance of the second heat exchange flow path of the outlet and the second heat exchanger of the first heat exchange flow path of the second heat exchanger, second changes The entrance of first heat exchange flow path of hot device is also connected with the outlet for heating indoor unit in multiple indoor units.
As shown in Figure 1, the pressure release control method of the multi-line system the following steps are included:
S1 obtains the delivery temperature of compressor or the exhaust of compressor when multi-line system is run with heating mode Pressure.
S2 judges whether delivery temperature is greater than the first preset temperature or it is default to judge whether pressure at expulsion is greater than first Pressure.
Wherein, the first preset temperature and the first preset pressure can be demarcated according to the actual situation, for example, the first default temperature Degree can be 56 DEG C, and the first preset pressure can be 3.3MPa.
S3, when delivery temperature is greater than the first preset temperature or pressure at expulsion is greater than the first preset pressure, if compression Machine is run with preset minimum frequency and maintains the first preset time, then is controlled to pressure release by-passing valve and first throttle element System, so that multi-line system carries out multi gear position pressure release work.
Wherein, the first preset time can be demarcated according to the actual situation, for example, the first preset time can be 1min。
Specifically, when multi-line system is heated with low capacity, delivery temperature Tc or the compression of compressor are obtained in real time The pressure at expulsion Pc of machine, and judge whether the delivery temperature Tc of compressor is greater than the first preset temperature Amax or judgement compression Whether the pressure at expulsion Pc of machine is greater than the first preset pressure Bmax.If the delivery temperature Tc of compressor is greater than the first preset temperature The pressure at expulsion Pc of Amax or compressor be greater than the first preset pressure Bmax, and compressor maintained because of frequency limit it is default Minimum frequency, and the state continues the first preset time, then to pressure release by-passing valve and first throttle element switches over and group Control is closed, multi-line system is made to carry out multi gear position pressure release work, to meet the pressure release demand within the scope of 0%-100%, guarantees system The safe and reliable stable operation of system.
In one embodiment of the invention, the pressure release gear of multi-line system includes the first gear, the second gear and the Three gears, wherein multi-line system is let out with the first gear to be controlled such that pressure release by-passing valve and first throttle element Press work, comprising: aperture is carried out to first throttle element and tunes up control, and controls pressure release by-passing valve and is in close state；? After two preset times, judge whether delivery temperature less than the second preset temperature or judges whether pressure at expulsion is pre- less than second If pressure；If delivery temperature, less than the second preset pressure, controls first segment less than the second preset temperature or pressure at expulsion Fluid element keeps current aperture constant, wherein the second preset temperature is less than the first preset temperature, and the second preset pressure is less than first Preset pressure, the second preset temperature, the second preset pressure and the second preset time can be demarcated according to the actual situation, for example, Second preset pressure can be 52 DEG C, and the second preset pressure can be 3.1MPa.
Further, when control first throttle element keeps current aperture constant, if delivery temperature is pre- less than third If temperature or pressure at expulsion are less than third preset pressure, then aperture are carried out to first throttle element and turn control down, wherein the Three preset temperatures are less than the second preset temperature, and for third preset pressure less than the second preset pressure, third preset temperature and third are pre- If pressure can be demarcated according to the actual situation, for example, third preset temperature can be 50 DEG C, third preset pressure can be 2.8MPa。
Further, when control first throttle element keeps current aperture constant, if delivery temperature is greater than first in advance If temperature or pressure at expulsion are greater than the first preset pressure, then continue to tune up control to first throttle element progress aperture, In, if temperature is pre- less than the 4th before the aperture of first throttle element reaches the valve of preset maximum opening and first throttle element If temperature, then by pressure release by-passing valve and first throttle element be controlled such that multi-line system with the third gear into Row pressure release work, wherein the 4th preset temperature can be demarcated according to the actual situation, for example, the 4th preset temperature can be the The permitted maximum temperature of one restricting element subtracts 10 DEG C.
Specifically, as shown in Fig. 2, can according to pressure release demand by the pressure release gear of multi-line system be divided into the first gear, Second gear and third gear, as shown in figure 3, carrying out pressure release work first when multi-line system needs pressure release with the first gear Make, specifically can comprise the following steps that
S101, when multi-line system is heated with low capacity, if there is Tc > the first preset temperature Amax or Pc > One preset pressure Bmax and compressor are run with preset minimum frequency and the state maintains 1min.
S102, multi-line system carry out pressure release work first with the first gear.
S103, in pressure release, as shown in Fig. 2, carrying out aperture to first throttle element according to a step/s tunes up control, simultaneously Control pressure release by-passing valve is in close state.
S104 after the second preset time t 2, judges whether there is the default pressure of Tc < the second preset temperature Cmax or Pc < second Power Dmax.If so, executing step S105；If not, executing step S108.
S105, first throttle element keep current aperture constant.
S106 judges whether there is Tc < third preset temperature when keeping first throttle element to keep current aperture constant Emax or Pc < third preset pressure Fmax.If so, executing step S107；If not, return step S105.
S107 carries out aperture to first throttle element according to a step/s and turns control, and return step S106 down.
S108 has further determined whether Tc > Amax or Pc > when first throttle element keeps current aperture constant Bmax.If so, executing step S109；If not, return step S105.
S109 continues to tune up control to first throttle element progress aperture according to a step/s.
S110 judges whether temperature Tm1 is less than b- before whether the aperture of first throttle element reaches maximum opening and its valve 10 DEG C, wherein b is the permitted maximum temperature of first throttle element (maximum operation (service) temperature).If so, executing step S111； If not, return step S108.
S111, multi-line system carry out pressure release work with third gear.
When due to system decompression, first passes through and control is tuned up to first throttle element progress aperture to realize low capacity pressure release essence It really adjusts, while pressure release by-passing valve is in close state, can not only effectively reduce the number of pressure release by-passing valve unlatching, raising is let out The service life for pressing by-passing valve can also avoid the occurrence of the problem for causing high pressure too low when pressure release by-passing valve is opened, to guarantee System being capable of safe and reliable operation.
Further, as shown in fig. 6, having First Heat Exchanger before first throttle element, hotter refrigerant is changed from first Hot device enters before first throttle element, can be too cold branch (by the second heat exchange flow path of First Heat Exchanger and the second heat exchanger The second heat exchange flow path constitute) it is cooling, then enter back into first throttle element.Refrigerant into first throttle element is more, quilt Cooling effect is poorer, and temperature is higher；Refrigerant into first throttle element is fewer, and cooled effect is better, and temperature is lower. Therefore, with the increase of first throttle element aperture, the refrigerant into first throttle element will also increase, and temperature will be corresponding Increase, and first throttle element have use to obtain valve body temperature limiting safely, therefore, temperature reaches before first throttle element valve When certain value, forbid tuning up control to first throttle element progress aperture, pressure release by-passing valve can be passed through at this time and carry out pressure release.
That is, in one embodiment of the invention, after the second preset time, if delivery temperature is more than or equal to second in advance If temperature and pressure at expulsion are more than or equal to the second preset pressure, then continue to carry out aperture to first throttle element to tune up control, directly When temperature reaches four preset temperatures before to the valve of first throttle element, by pressure release by-passing valve and the progress of first throttle element It controls so that multi-line system carries out pressure release work with the second gear.
According to one embodiment of present invention, multi-connected machine system is controlled such that pressure release by-passing valve and first throttle element System carries out pressure release work with second gear, comprising: control pressure release by-passing valve is in the open state, and controls first throttle member Part is in close state.
That is, when the aperture of first throttle element has reached the maximum aperture and is still unable to satisfy pressure release demand, it can Increase pressure release adjustable range to open by control pressure release by-passing valve, to meet higher pressure release demand.
According to one embodiment of present invention, it opens, and is delayed after third preset time in control pressure release by-passing valve, judgement Whether whether delivery temperature less than the second preset temperature or judge pressure at expulsion less than the second preset pressure, wherein if row Temperature degree less than the second preset pressure, then controls pressure release by-passing valve and keeps it turning on less than the second preset temperature or pressure at expulsion State；If delivery temperature is more than or equal to the second preset temperature and pressure at expulsion and is more than or equal to the second preset pressure, by pair Pressure release by-passing valve and first throttle element are controlled such that multi-line system carries out pressure release work with third gear, wherein the Three preset times can be demarcated according to the actual situation.
Further, control by-passing valve keep it turned on when, if delivery temperature be greater than the 5th preset temperature or The running speed of compressor is greater than the first preset rotation speed, then controls the closing of pressure release by-passing valve.Wherein, the 5th preset temperature and first Preset rotation speed can be demarcated according to the actual situation, for example, the 5th preset temperature can be 90 DEG C, the first preset rotation speed can be with For 50rps.
Specifically, as shown in figure 4, when multi-line system carries out pressure release work with the second gear, it may include following steps:
S201, multi-line system carry out pressure release work with the second gear.
S202 as shown in Fig. 2, pressure release by-passing valve is in the open state, while controlling first throttle element and being in closing shape State.
S203 after third preset time t 3, judges whether there is Tc < Cmax or Pc < Dmax.If so, executing step S204；If not, executing step S207.
S204, control pressure release by-passing valve are kept it turned on.
S205 judges whether the delivery temperature of compressor is greater than the 5th preset temperature K or the running speed of compressor is greater than First preset rotation speed.If so, executing step S206；If not, return step S204.
S206, control pressure release by-passing valve are in close state.
S207, multi-line system carry out pressure release work with third gear.
According to one embodiment of present invention, multi-connected machine system is controlled such that pressure release by-passing valve and first throttle element System carries out pressure release work with third gear, comprising: control pressure release by-passing valve is in the open state, and carries out to first throttle element Aperture tunes up control.
That is, under the premise of pressure release by-passing valve is in the open state, gradually from 0 by the aperture of first throttle element It tunes up, to meet higher pressure release demand.
According to one embodiment of present invention, default the 4th when the aperture to first throttle element is gradually tuned up from 0 After time, judge delivery temperature whether less than the second preset temperature or judge pressure at expulsion whether less than the second preset pressure, Wherein, if delivery temperature less than the second preset temperature or pressure at expulsion less than the second preset pressure, control first throttle Element keeps current aperture constant, wherein the 4th preset time can be demarcated according to the actual situation.
Further, if delivery temperature is more than or equal to the second preset temperature and pressure at expulsion is more than or equal to the second default pressure Power then continues to carry out aperture to first throttle element to tune up control, until temperature is more than or equal to the before the valve of first throttle element Six preset temperatures and continue the 5th preset time or until temperature is more than or equal to the 7th default temperature before the valve of first throttle element When spending, control multi-line system enters heating standby state.Wherein, the 5th preset time, the 6th preset temperature and the 7th are default Temperature can be demarcated according to the actual situation, for example, the 6th preset temperature can be permitted most for first throttle element Big temperature subtracts 5 DEG C, and the 5th preset time can be 30min, and the 7th preset temperature can be permitted for first throttle element Maximum temperature.
Further, when control first throttle element keeps current aperture constant, if delivery temperature is pre- less than third If temperature or pressure at expulsion are less than third preset pressure, then aperture are carried out to first throttle element and turn control down, wherein when When the aperture of first throttle element is turned down to 0, if delivery temperature is greater than the running speed of the 5th preset temperature or compressor Greater than the first preset rotation speed, then the closing of pressure release by-passing valve is controlled.
Specifically, as shown in figure 5, when multi-line system carries out pressure release work with third gear, it may include following steps:
S301, multi-line system carry out pressure release work with third gear.
S302, as shown in Fig. 2, control pressure release by-passing valve it is in the open state, and according to a step/s to first throttle element into Row aperture tunes up control.
S303 after the 4th preset time t 4, judges whether there is Tc < Cmax or Pc < Dmax.If so, executing step S304；If not, executing step S305；
S304, control first throttle element keep current aperture constant.
S305 continues to tune up control to first throttle element progress aperture according to a step/s.
S306 judges whether there is the 6th b-5 DEG C of preset temperature of temperature Tm1 > before first throttle element valve and continues 30min, Or b DEG C of preset temperature of Tm1 > the 7th.If so, executing step S307；If not, return step S305.
S307, multi-line system enter heating standby state.
S308 judges whether there is Tc < Emax or Pc < Fmax when first throttle element keeps current aperture constant. If so, executing step S309；If not, return step S304.
S309 carries out aperture to first throttle element according to a step/s and turns control down.
It is default to judge whether the delivery temperature of compressor is greater than the 5th when the aperture of first throttle element is closed to 0 by S310 Whether the running speed of temperature K or compressor is greater than the first preset rotation speed.If so, executing step S311；If not, executing Step S312.
S311, control pressure release by-passing valve are in close state.
S312, control pressure release by-passing valve are in the open state.
Therefore, when multi-line system needs pressure release, it can realize that low capacity pressure release is accurately adjusted by first throttle element, And adjustable range is increased by pressure release by-passing valve, so that system realizes low capacity adjustable extent by first throttle element Pressure release is realized large capacity pressure release by pressure release by-passing valve, and realizes large capacity by first throttle element and pressure release by-passing valve Adjustable extent pressure release realizes the strategy that variable capacity accurately controls pressure release, meet the pressure release demand of 0%-100% range, Effectively prevent the unstable and inaccurate problem of pressure release.
In conclusion the pressure release control method of multi-line system according to an embodiment of the present invention, in multi-line system to make When heat pattern is run, the delivery temperature of compressor or the pressure at expulsion of compressor are obtained, judges whether delivery temperature is greater than the One preset temperature or judge whether pressure at expulsion is greater than the first preset pressure, when delivery temperature be greater than the first preset temperature or Person's pressure at expulsion be greater than the first preset pressure when, if compressor run with preset minimum frequency and maintain first it is default when Between, then pressure release by-passing valve and first throttle element are controlled, so that multi-line system carries out multi gear position pressure release work, thus It realizes variable capacity and accurately controls pressure release strategy, meet the pressure release demand of 0%-100% range, effectively reduce system progress The number of the switching on and shutting down of high voltage protective ensure that safety, reliability and the comfort of system.Reduce pressure release by-passing valve simultaneously Opening times, ensure that the stability and comfort of system while energy saving, and improve pressure release by-passing valve use the longevity Life and reliability.
Fig. 6 is the structural schematic diagram of multi-line system according to an embodiment of the invention.As shown in fig. 6, the multi-connected machine System includes: outdoor unit 100, part flow arrangement 200, multiple outdoor units 300 and control module (not specifically illustrated in figure).
Wherein, outdoor unit 100 includes by compressor 110 and the pressure release being arranged between the exhaust outlet of compressor and gas returning port Port valve 120.Part flow arrangement 200 includes First Heat Exchanger 210, the second heat exchanger 220, first throttle element 230 and the second throttling Outlet and the second heat exchanger 220 of the first heat exchange flow path of First Heat Exchanger 210 is arranged in element 240, first throttle element 230 First heat exchange flow path entrance between, the second restricting element 240 be arranged in the second heat exchanger 220 first heat exchange flow path go out Between the entrance of second heat exchange flow path of mouth and the second heat exchanger 220, the entrance of the first heat exchange flow path of the second heat exchanger 220 is also It is connected with the outlet for heating indoor unit in multiple indoor units 300.
Control module be used for when multi-line system is run with heating mode, obtain compressor 110 delivery temperature or The pressure at expulsion of compressor 110, and judge whether delivery temperature is greater than the first preset temperature or judges whether pressure at expulsion is big In the first preset pressure, when delivery temperature is greater than the first preset temperature or pressure at expulsion is greater than the first preset pressure, if Compressor 110 is with the operation of preset minimum frequency and maintains the first preset time, and control module is then to pressure release by-passing valve 120 and the One restricting element 230 is controlled, so that multi-line system carries out multi gear position pressure release work.Wherein, the first preset temperature can be with It is 56 DEG C, the first preset pressure can be 3.3MPa, and the first preset time can be 1min.
Specifically, when multi-line system is heated with low capacity, control module obtains compression by temperature sensor in real time The delivery temperature Tc of the machine or pressure at expulsion Pc for obtaining compressor in real time by pressure sensor, and judge the row of compressor Whether temperature degree Tc is greater than the first preset temperature Amax or judges whether the pressure at expulsion Pc of compressor is greater than the first default pressure Power Bmax.If the delivery temperature Tc of compressor is greater than the first preset temperature Amax or the pressure at expulsion Pc of compressor is greater than First preset pressure Bmax, and compressor maintains preset minimum frequency because of frequency limit, and the state continues first and presets Time, control module then switch over and combine control to pressure release by-passing valve 120 and first throttle element 230, make multi-connected machine system System carries out multi gear position pressure release work, to meet the pressure release demand within the scope of 0%-100%, guarantees that the safe and reliable of system stablizes fortune Row.
According to one embodiment of present invention, the pressure release gear of multi-line system includes the first gear, the second gear and the Three gears, wherein control module to pressure release by-passing valve 120 and first throttle element 230 be controlled such that multi-line system with When first gear carries out pressure release work, wherein control module carries out aperture to first throttle element 230 and tunes up control, and controls Pressure release by-passing valve 120 is in close state；After the second preset time, judge delivery temperature whether less than the second preset temperature, Or judge pressure at expulsion whether less than the second preset pressure；If delivery temperature is less than the second preset temperature or exhaust pressure Less than the second preset pressure, control module then controls first throttle element 230 and keeps current aperture constant power.Wherein, second is pre- If temperature, less than the first preset temperature, for the second preset pressure less than the first preset pressure, the second preset pressure can be 52 DEG C, the Two preset pressures can be 3.1MPa.
Further, control module is when control first throttle element 230 keeps current aperture constant, if delivery temperature It is less than third preset pressure less than third preset temperature or pressure at expulsion, control module then carries out first throttle element 230 Aperture turns control down, wherein third preset temperature less than the second preset temperature, third preset pressure less than the second preset pressure, Third preset temperature can be 50 DEG C, and third preset pressure can be 2.8MPa.
Further, control module is when control first throttle element 230 keeps current aperture constant, if delivery temperature It is greater than the first preset pressure greater than the first preset temperature or pressure at expulsion, control module then continues to first throttle element 230 It carries out aperture and tunes up control, wherein if the aperture of first throttle element 230 reaches preset maximum opening and first throttle member Temperature is less than the 4th preset temperature before the valve of part 230, and control module is then by pressure release by-passing valve 120 and first throttle element 230 are controlled such that multi-line system carries out pressure release work with third gear.Wherein, the 4th preset temperature can be first segment The permitted maximum temperature of fluid element subtracts 10 DEG C.
Specifically, as shown in Fig. 2, can according to pressure release demand by the pressure release gear of multi-line system be divided into the first gear, Second gear and third gear.When multi-line system needs pressure release, pressure release work is carried out with the first gear first, it is specific as schemed Shown in 3, I will not elaborate.
When due to system decompression, first passes through and control is tuned up to first throttle element progress aperture to realize low capacity pressure release essence It really adjusts, while pressure release by-passing valve is in close state, can not only effectively reduce the number of pressure release by-passing valve unlatching, raising is let out The service life for pressing by-passing valve can also avoid the occurrence of the problem for causing high pressure too low when pressure release by-passing valve is opened, to guarantee System being capable of safe and reliable operation.
Further, as shown in fig. 6, before first throttle element 230 have First Heat Exchanger 210, hotter refrigerant from First Heat Exchanger 210 enters before first throttle element 230, can be too cold branch and (be flowed by the second heat exchange of First Heat Exchanger 210 Second heat exchange flow path of road and the second heat exchanger 220 is constituted) it is cooling, then enter back into first throttle element 230.Into first segment The refrigerant of fluid element 230 is more, and cooled effect is poorer, and temperature is higher；Refrigerant into first throttle element 230 is fewer, Cooled effect is better, and temperature is lower.Therefore, with the increase of 230 aperture of first throttle element, into first throttle element 230 refrigerant will also increase, and temperature will be increased accordingly, and first throttle element 230 have use to obtain valve body temperature safely Therefore limitation when temperature reaches certain value before 230 valve of first throttle element, is forbidden carrying out aperture to first throttle element 230 Control is tuned up, pressure release can be carried out by pressure release by-passing valve 120 at this time.
That is, in one embodiment of the invention, after the second preset time, if delivery temperature is more than or equal to second in advance If temperature and pressure at expulsion are more than or equal to the second preset pressure, control module then continues to carry out aperture to first throttle element 230 Control is tuned up, until when temperature reaches four preset temperatures before the valve of first throttle element 230, by pressure release by-passing valve 120 It is controlled such that multi-line system carries out pressure release work with the second gear with first throttle element 230.
According to one embodiment of present invention, control module controls pressure release by-passing valve 120 and first throttle element 230 When making so that multi-line system carries out pressure release work with the second gear, wherein control module control pressure release by-passing valve 120, which is in, to be opened State is opened, and controls first throttle element 230 and is in close state.
That is, when the aperture of first throttle element 230 has reached the maximum aperture and is still unable to satisfy pressure release demand, It can be opened by control pressure release by-passing valve 120 to increase pressure release adjustable range, to meet higher pressure release demand.
According to one embodiment of present invention, it is opened in control pressure release by-passing valve 120, and after third preset time, control Molding block judge delivery temperature whether less than the second preset temperature or judge pressure at expulsion whether less than the second preset pressure, Wherein, if delivery temperature less than the second preset temperature or pressure at expulsion less than the second preset pressure, control module if, controls Pressure release by-passing valve 120 is kept it turned on；If delivery temperature is more than or equal to the second preset temperature and pressure at expulsion is more than or equal to Second preset pressure, control module is then by being controlled such that multi-connected machine to pressure release by-passing valve 120 and first throttle element 230 System carries out pressure release work with third gear.
Further, control module is preset when control by-passing valve is kept it turned on if delivery temperature is greater than the 5th The running speed of temperature or compressor 110 is greater than the first preset rotation speed, and control module then controls the closing of pressure release by-passing valve 120. Wherein, the 5th preset temperature can be 90 DEG C, and the first preset rotation speed can be 50rps.
Specifically, when multi-line system carries out pressure release work with the second gear, as shown in figure 4, which is not described herein again.
According to one embodiment of present invention, control module controls pressure release by-passing valve 120 and first throttle element 230 When making so that multi-line system carries out pressure release work with third gear, wherein control module control pressure release by-passing valve 120, which is in, to be opened State is opened, aperture is carried out to first throttle element 230 and tunes up control.
That is, under the premise of pressure release by-passing valve 120 is in the open state, by the aperture of first throttle element 230 It is gradually tuned up from 0, to meet higher pressure release demand.
According to one embodiment of present invention, when the aperture to first throttle element 230 is gradually tuned up from 0, the 4th After preset time, judge whether delivery temperature less than the second preset temperature or judges whether pressure at expulsion is default less than second Pressure, wherein if delivery temperature is less than the second preset temperature or pressure at expulsion less than the second preset pressure, control module Then controlling first throttle element 230 keeps current aperture constant.
Further, if delivery temperature is more than or equal to the second preset temperature and pressure at expulsion is more than or equal to the second default pressure Power, control module then continues to tune up control to the progress of first throttle element 230 aperture, until before the valve of first throttle element 230 Temperature be more than or equal to the 6th preset temperature and continue the 5th preset time or until first throttle element 230 valve before temperature it is big When being equal to seven preset temperatures, control multi-line system enters heating standby state.Wherein, the 6th preset temperature can be the The permitted maximum temperature of one restricting element subtracts 5 DEG C, and the 5th preset time can be 30min, and the 7th preset temperature can be The permitted maximum temperature of first throttle element.
Further, control module is when control first throttle element 230 keeps current aperture constant, if delivery temperature It is less than third preset pressure less than third preset temperature or pressure at expulsion, control module then carries out first throttle element 230 Aperture turns control down, wherein when the aperture of first throttle element 230 is turned down to 0, if delivery temperature is greater than the 5th default temperature The running speed of degree or compressor 110 is greater than the first preset rotation speed, and control module then controls the closing of pressure release by-passing valve 120.
Specifically, when multi-line system carries out pressure release work with third gear, as shown in figure 5, which is not described herein again.
Therefore, when multi-line system needs pressure release, it can realize that low capacity pressure release is accurately adjusted by first throttle element, And adjustable range is increased by pressure release by-passing valve, so that system realizes low capacity adjustable extent by first throttle element Pressure release is realized large capacity pressure release by pressure release by-passing valve, and realizes large capacity by first throttle element and pressure release by-passing valve Adjustable extent pressure release realizes the strategy that variable capacity accurately controls pressure release, meet the pressure release demand of 0%-100% range, Effectively prevent the unstable and inaccurate problem of pressure release.
Multi-line system according to an embodiment of the present invention, control module are obtained when multi-line system is run with heating mode Take the delivery temperature of compressor or the pressure at expulsion of compressor, and judge delivery temperature whether be greater than the first preset temperature or Person judges whether pressure at expulsion is greater than the first preset pressure, when delivery temperature is big greater than the first preset temperature or pressure at expulsion When the first preset pressure, if compressor runs with preset minimum frequency and maintain the first preset time, if control module Pressure release by-passing valve and the first throttle element are controlled, so that multi-line system carries out multi gear position pressure release work.To It realizes variable capacity and accurately controls pressure release strategy, meet the pressure release demand of 0%-100% range, effectively reduce system progress The number of the switching on and shutting down of high voltage protective ensure that safety, reliability and the comfort of system.Reduce pressure release by-passing valve simultaneously Opening times, ensure that the stability and comfort of system while energy saving, and improve pressure release by-passing valve use the longevity Life and reliability.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims (24)

1. a kind of pressure release control method of multi-line system, which is characterized in that the multi-line system includes outdoor unit, shunts dress Set with multiple indoor units, the outdoor unit includes letting out between compressor and exhaust outlet and gas returning port that the compressor is arranged in By-passing valve is pressed, the part flow arrangement includes First Heat Exchanger, the second heat exchanger, first throttle element and the second restricting element, institute State the outlet and the first of second heat exchanger that the first heat exchange flow path of the First Heat Exchanger is arranged in first throttle element Exchange heat flow path entrance between, second restricting element be arranged in second heat exchanger first heat exchange flow path outlet with Second heat exchanger second heat exchange flow path entrance between, second heat exchanger first heat exchange flow path entrance also with The outlet that indoor unit is heated in the multiple indoor unit is connected, and the described method comprises the following steps:
When the multi-line system is run with heating mode, obtain the compressor delivery temperature or the compressor Pressure at expulsion；
Judge whether the delivery temperature is greater than the first preset temperature or it is default to judge whether the pressure at expulsion is greater than first Pressure；
When the delivery temperature is greater than first preset temperature or the pressure at expulsion greater than first preset pressure When, if the compressor runs with preset minimum frequency and maintains the first preset time, to the pressure release by-passing valve and The first throttle element is controlled, so that the multi-line system carries out multi gear position pressure release work.
2. the method as described in claim 1, which is characterized in that the pressure release gear of the multi-line system include the first gear, Second gear and third gear, wherein the pressure release by-passing valve and the first throttle element are controlled such that described more On-line system carries out pressure release work with first gear, comprising:
Aperture is carried out to the first throttle element and tunes up control, and controls the pressure release by-passing valve and is in close state；
After the second preset time, judge whether the delivery temperature less than the second preset temperature or judges the exhaust pressure Whether power is less than the second preset pressure, wherein second preset temperature is less than first preset temperature, and described second is default Pressure is less than first preset pressure；
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power then controls the first throttle element and keeps current aperture constant.
3. method according to claim 2, which is characterized in that keep current aperture constant controlling the first throttle element When, if the delivery temperature is less than third preset temperature or the pressure at expulsion is less than third preset pressure, to described First throttle element carries out aperture and turns control down, wherein and the third preset temperature is less than second preset temperature, and described the Three preset pressures are less than second preset pressure.
4. method according to claim 2, which is characterized in that keep current aperture constant controlling the first throttle element When, if the delivery temperature is greater than first preset temperature or the pressure at expulsion is greater than first preset pressure, Then continue to tune up control to first throttle element progress aperture, wherein
If the aperture of the first throttle element reaches temperature before the valve of preset maximum opening and the first throttle element It is less than the 4th preset temperature, then described multi-joint by being controlled such that the pressure release by-passing valve and the first throttle element Machine system carries out pressure release work with the third gear.
5. method according to claim 2, which is characterized in that after second preset time, if the delivery temperature More than or equal to second preset temperature and the pressure at expulsion is more than or equal to second preset pressure, then continues to described the One restricting element carries out aperture and tunes up control, until when temperature reaches four preset temperatures before the valve of the first throttle element, By being controlled such that the multi-line system with the second gear pressure release by-passing valve and the first throttle element Position carries out pressure release work.
6. method as claimed in claim 5, which is characterized in that carried out to the pressure release by-passing valve and the first throttle element It controls so that the multi-line system carries out pressure release work with second gear, comprising:
It is in the open state to control the pressure release by-passing valve, and controls the first throttle element and is in close state.
7. method as claimed in claim 6, which is characterized in that after third preset time, whether judge the delivery temperature Less than second preset temperature or judge whether the pressure at expulsion is less than second preset pressure, wherein
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power then controls the pressure release by-passing valve and keeps it turned on；
If the delivery temperature is more than or equal to second preset temperature and the pressure at expulsion is more than or equal to described second in advance If pressure, then by being controlled such that the multi-line system with institute the pressure release by-passing valve and the first throttle element It states third gear and carries out pressure release work.
8. the method for claim 7, which is characterized in that when the control by-passing valve is kept it turned on, if institute It states delivery temperature and is greater than the first preset rotation speed greater than the running speed of the 5th preset temperature or the compressor, then control institute State the closing of pressure release by-passing valve.
9. the method as described in claim 4 or 7, which is characterized in that the pressure release by-passing valve and the first throttle element It is controlled such that the multi-line system carries out pressure release work with the third gear, comprising:
It is in the open state to control the pressure release by-passing valve, and aperture is carried out to the first throttle element and tunes up control.
10. method as claimed in claim 9, which is characterized in that after the 4th preset time, whether judge the delivery temperature Less than second preset temperature or judge whether the pressure at expulsion is less than second preset pressure, wherein
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power then controls the first throttle element and keeps current aperture constant.
11. method as claimed in claim 10, which is characterized in that preset if the delivery temperature is more than or equal to described second Temperature and the pressure at expulsion are more than or equal to second preset pressure, then continue to carry out aperture tune to the first throttle element Big control, until before the valve of the first throttle element temperature be more than or equal to the 6th preset temperature and continue the 5th preset time or Person controls the multi-line system and enters until when temperature is more than or equal to seven preset temperatures before the valve of the first throttle element Heating standby state.
12. method as claimed in claim 10, which is characterized in that keep current aperture not controlling the first throttle element When change, if the delivery temperature is less than third preset temperature or the pressure at expulsion is less than third preset pressure, to institute It states first throttle element progress aperture and turns control down, wherein
When the aperture of the first throttle element is turned down to 0, if the delivery temperature is greater than the 5th preset temperature or institute The running speed for stating compressor is greater than the first preset rotation speed, then controls the pressure release by-passing valve and close.
13. a kind of multi-line system characterized by comprising
Outdoor unit, the outdoor unit include by the pressure release between compressor and exhaust outlet and gas returning port that the compressor is arranged in Port valve；
Part flow arrangement, the part flow arrangement include First Heat Exchanger, the second heat exchanger, first throttle element and the second throttling member Exporting and second heat exchanger for the first heat exchange flow path of the First Heat Exchanger is arranged in part, the first throttle element Between the entrance of first heat exchange flow path, going out for the first heat exchange flow path of second heat exchanger is arranged in second restricting element Between the entrance of second heat exchange flow path of mouth and second heat exchanger；
Multiple indoor units, the entrance of the first heat exchange flow path of second heat exchanger is also and in heating chamber in the multiple indoor unit The outlet of machine is connected；
Control module, the control module are used for when the multi-line system is run with heating mode, obtain the compressor Delivery temperature or the compressor pressure at expulsion, and judge the delivery temperature whether be greater than the first preset temperature or Person judges whether the pressure at expulsion is greater than the first preset pressure, when the delivery temperature be greater than first preset temperature or When pressure at expulsion described in person is greater than first preset pressure, if the compressor is run and is maintained with preset minimum frequency First preset time, the control module then controls the pressure release by-passing valve and the first throttle element, so that institute It states multi-line system and carries out multi gear position pressure release work.
14. multi-line system as claimed in claim 13, which is characterized in that the pressure release gear of the multi-line system includes the One gear, the second gear and third gear, wherein the control module is to the pressure release by-passing valve and the first throttle element When being controlled such that the multi-line system carries out pressure release work with first gear, wherein
The control module carries out aperture to the first throttle element and tunes up control, and controls the pressure release by-passing valve and be in pass Closed state；
After the second preset time, judge whether the delivery temperature less than the second preset temperature or judges the exhaust pressure Whether power is less than the second preset pressure, wherein second preset temperature is less than first preset temperature, and described second is default Pressure is less than first preset pressure；
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power, the control module then control the first throttle element and keep current aperture constant.
15. multi-line system as claimed in claim 14, which is characterized in that the control module is controlling the first throttle When element keeps current aperture constant, if the delivery temperature is less than third preset temperature or the pressure at expulsion is less than Third preset pressure, the control module then carry out aperture to the first throttle element and turn control down, wherein the third is pre- If temperature is less than second preset temperature, the third preset pressure is less than second preset pressure.
16. multi-line system as claimed in claim 14, which is characterized in that the control module is controlling the first throttle When element keeps current aperture constant, if the delivery temperature is greater than first preset temperature or the pressure at expulsion Greater than first preset pressure, the control module then continues to tune up control to first throttle element progress aperture, In,
If the aperture of the first throttle element reaches temperature before the valve of preset maximum opening and the first throttle element Less than the 4th preset temperature, the control module is then by controlling the pressure release by-passing valve and the first throttle element So that the multi-line system carries out pressure release work with the third gear.
17. multi-line system as claimed in claim 14, which is characterized in that after second preset time, if described Delivery temperature is more than or equal to second preset temperature and the pressure at expulsion is more than or equal to second preset pressure, the control Molding block then continues to tune up control to first throttle element progress aperture, until temperature before the valve of the first throttle element It is described multi-joint by being controlled such that the pressure release by-passing valve and the first throttle element when reaching four preset temperatures Machine system carries out pressure release work with second gear.
18. multi-line system as claimed in claim 17, which is characterized in that the control module to the pressure release by-passing valve and When the first throttle element is controlled such that the multi-line system carries out pressure release work with second gear, wherein It is in the open state that the control module controls the pressure release by-passing valve, and controls the first throttle element and be in closing shape State.
19. multi-line system as claimed in claim 18, which is characterized in that after third preset time, the control module Judge whether the delivery temperature is less than second preset temperature or judges whether the pressure at expulsion is less than described second Preset pressure, wherein
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power, the control module then control the pressure release by-passing valve and keep it turned on；
If the delivery temperature is more than or equal to second preset temperature and the pressure at expulsion is more than or equal to described second in advance If pressure, the control module is then described more by being controlled such that the pressure release by-passing valve and the first throttle element On-line system carries out pressure release work with the third gear.
20. multi-line system as claimed in claim 19, which is characterized in that the control module is controlling the by-passing valve guarantor When holding open state, if the running speed that the delivery temperature is greater than the 5th preset temperature or the compressor is greater than the One preset rotation speed, the control module then control the pressure release by-passing valve and close.
21. the multi-line system as described in claim 16 or 19, which is characterized in that the control module bypasses the pressure release When valve and the first throttle element are controlled such that the multi-line system carries out pressure release work with the third gear, In,
The control module control pressure release by-passing valve is in the open state, carries out aperture to the first throttle element and tunes up Control.
22. multi-line system as claimed in claim 21, which is characterized in that after the 4th preset time, judge the exhaust Whether temperature is less than second preset temperature or judges whether the pressure at expulsion is less than second preset pressure, In,
If the delivery temperature is less than second preset temperature or the pressure at expulsion is less than the described second default pressure Power, the control module then control the first throttle element and keep current aperture constant.
23. multi-line system as claimed in claim 22, which is characterized in that if the delivery temperature is more than or equal to described the Two preset temperatures and the pressure at expulsion are more than or equal to second preset pressure, and the control module then continues to described first Restricting element carries out aperture and tunes up control, until before the valve of the first throttle element temperature more than or equal to the 6th preset temperature and Continue the 5th preset time or until when temperature is more than or equal to seven preset temperatures before the valve of the first throttle element, controls The multi-line system enters heating standby state.
24. multi-line system as claimed in claim 22, which is characterized in that the control module is controlling the first throttle When element keeps current aperture constant, if the delivery temperature is less than third preset temperature or the pressure at expulsion is less than Third preset pressure, the control module then carry out aperture to the first throttle element and turn control down, wherein
When the aperture of the first throttle element is turned down to 0, if the delivery temperature is greater than the 5th preset temperature or institute The running speed for stating compressor is greater than the first preset rotation speed, and the control module then controls the pressure release by-passing valve and closes.
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