CN109373636A - System and method for preventing liquid impact - Google Patents
System and method for preventing liquid impact Download PDFInfo
- Publication number
- CN109373636A CN109373636A CN201811334365.2A CN201811334365A CN109373636A CN 109373636 A CN109373636 A CN 109373636A CN 201811334365 A CN201811334365 A CN 201811334365A CN 109373636 A CN109373636 A CN 109373636A
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- Prior art keywords
- pressure
- soakage
- suction
- compressor
- suction superheat
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- 239000007788 liquid Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003507 refrigerant Substances 0.000 claims description 34
- 239000002826 coolant Substances 0.000 claims description 32
- 238000005057 refrigeration Methods 0.000 claims description 7
- 230000003434 inspiratory effect Effects 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 abstract description 20
- 239000003921 oil Substances 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0401—Refrigeration circuit bypassing means for the compressor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a system and a method for preventing liquid impact, wherein the system comprises: a bypass pipeline connecting the exhaust pipeline and the suction pipeline of the compressor, wherein the bypass pipeline is provided with an adjustable switch and an electronic expansion valve; the bypass pipeline is used for extracting the exhaust gas of the compressor so that the exhaust gas is mixed with the suction gas of the compressor sequentially through the adjustable switch and the electronic expansion valve to control the suction gas superheat degree to meet a preset condition so as to prevent liquid impact; the adjustable switch is used for adjusting the suction volume of the exhaust gas in the bypass pipeline; and the electronic expansion valve is used for carrying out temperature reduction and pressure reduction treatment on the exhaust gas. Therefore, the air suction and liquid carrying of the compressor can be avoided, and the gas-liquid separator is not required to be arranged, so that the return oil can directly flow into the compressor, and the normal oil return of the system is ensured while the liquid impact phenomenon is avoided. The utilization efficiency of the lubricating oil is improved, the filling amount of the lubricating oil is reduced, and the energy is saved.
Description
Technical field
The present invention relates to unit fields, in particular to a kind of system and method for preventing liquid hammer.
Background technique
Currently, compressor air suction is with liquid in order to prevent, equipped with gas-liquid before the air entry of compressor in water cooler
Separator separates gas-liquid two-phase refrigerant, so that the refrigerant into compressor contains only a small amount of liquid refrigerants and lacks
Lubricating oil is measured, avoids compressor that liquid hammer occurs.And the air-breathing bottom of the tube of gas-liquid separator is provided with oil return hole, to realize lubricating oil
Enter compressor with refrigerant.Even with the presence of oil return hole, the bottom of gas-liquid separator can still store a part of lubricating oil, from
And the charging amount of the lubricating oil of refrigeration system is caused to increase, and energy waste is caused, resulting even in compressor lacks lubricating oil,
To damage unit.
Therefore, how while avoiding lubricating oil from wasting, the generation of compressor liquid hit phenomenon is prevented, becomes urgently to be resolved
The technical issues of.
Summary of the invention
When to solve to avoid liquid hit phenomenon using gas-liquid separator in the related technology, the utilization efficiency of lubricating oil can be reduced
Problem, the embodiment of the present invention provide a kind of system and method for preventing liquid hammer.
In a first aspect, the embodiment of the present invention provides a kind of system for preventing liquid hammer, and the system comprises: connect compressor row
The bypass line of air pipe and suction line is provided with rearrangeable switch and electric expansion valve on the bypass line；
The bypass line, for extracting the exhaust of the compressor so that it is described exhaust pass sequentially through it is described adjustable
Switch, the electric expansion valve and the compressor air-breathing mix, meet preset condition to control suction superheat, to prevent
Only liquid hammer；
The rearrangeable switch, for adjusting the soakage of exhaust described in the bypass line；
The electric expansion valve, for carrying out decrease temperature and pressure processing to the exhaust.
Further, the preset condition is that the suction superheat is in pre-set interval.
Further, the rearrangeable switch, be specifically used for according to the suction superheat, pressure of inspiration(Pi), pressure at expulsion and
Delivery temperature changes the aperture of itself, reaches setting soakage to control the soakage of the exhaust；Wherein, the setting sucking
After amount is determines heat exchange amount according to the suction superheat, the pressure of inspiration(Pi), further according to the heat exchange amount, the delivery temperature
With the soakage of exhaust determined by the pressure at expulsion；The heat exchange amount is pre- to be converted to the liquid refrigerants in the air-breathing
If heat needed for gaseous coolant；When the heat exchange amount is identical, the setting soakage is with the delivery temperature or described
The raising of pressure at expulsion and reduce；Wherein, the default gaseous coolant is so that the suction superheat meets the default item
Increased gaseous coolant needed for part.
Further, the rearrangeable switch, when for being less than the left end point of the pre-set interval in the suction superheat,
The increase of itself aperture is controlled, is increased to the setting soakage to control the inspiratory capacity；It is greater than institute in the suction superheat
When stating the right endpoint of pre-set interval, controlling itself aperture is zero, is zero to control the inspiratory capacity.
Further, the system also includes: low tension switch and check valve in the suction line, the list are set
To valve between the low tension switch and the compressor, for preventing gaseous coolant from flowing backwards；Wherein, the low tension switch packet
Include heating low tension switch and refrigeration low tension switch.
Further, the system also includes: the pressure sensor in the suction line and air-breathing temperature sensing package are set,
The pressure sensor and the air-breathing temperature sensing package between the check valve and the compressor,
The pressure sensor, for obtaining the pressure of inspiration(Pi) of the compressor inlet；
The air-breathing temperature sensing package, for obtaining the suction temperature of the compressor inlet.
Further, the suction superheat is determined by following formula: the suction superheat=suction temperature-
The corresponding saturation temperature of the pressure of inspiration(Pi).
Further, when the air-breathing temperature sensing package is between the check valve and the pressure sensor, the side
The tie point of siphunculus road and the gas exhaust piping is between the check valve and the air-breathing temperature sensing package；
When the pressure sensor is between the check valve and the air-breathing temperature sensing package, the tie point is described
Between check valve and the pressure sensor.
Further, the system is air-conditioning system.
Second aspect, the embodiment of the present invention provide a kind of method for preventing liquid hammer, and the method is applied to first aspect institute
The system stated, which comprises
Detect the suction superheat of the system；
Judge whether the suction superheat meets preset condition；
If it is not, then bypass line is opened, so that the exhaust of compressor passes through the bypass line and the compressor
Air-breathing mix, until the suction superheat meets the preset condition.
Further, judge whether the suction superheat meets preset condition and include:
Judge whether the suction superheat is in pre-set interval.
Further, if it is not, then unlatching bypass line includes:
According to the suction superheat, pressure of inspiration(Pi), delivery temperature and pressure at expulsion control on the bypass line can
The aperture of tune switch reaches setting soakage to control the soakage of the exhaust.
Further, the bypass pipe is controlled according to the suction superheat, pressure of inspiration(Pi), delivery temperature and pressure at expulsion
The aperture of the rearrangeable switch of road, with control the soakage of the exhaust reach setting soakage include:
When the suction superheat is less than the left end point of the pre-set interval, controls the aperture and increase, to control
The soakage for stating exhaust is increased to the setting soakage；
When the suction superheat is greater than the right endpoint of the pre-set interval, controlling the aperture is zero, to control
The soakage for stating exhaust is reduced to zero.
Further, the soakage that sets is as after determining heat exchange amount according to the suction superheat, the pressure of inspiration(Pi),
Further according to the soakage of exhaust determined by the heat exchange amount, the delivery temperature and the pressure at expulsion；
Wherein, the heat exchange amount is heat needed for the liquid refrigerants in the air-breathing is converted to default gaseous coolant；
When the heat exchange amount is identical, the setting soakage is reduced with the raising of the delivery temperature or the pressure at expulsion；
The default gaseous coolant is so that the suction superheat meets increased gaseous coolant needed for the preset condition.
It applies the technical scheme of the present invention, the system for preventing liquid hammer includes: connect compressor gas exhaust piping and suction line
Bypass line, be provided with rearrangeable switch and electric expansion valve on bypass line；Bypass line, for extracting the row of compressor
Gas, so that the air-breathing that exhaust passes sequentially through rearrangeable switch, electric expansion valve and compressor mixes, to control suction superheat
Meet preset condition, to prevent liquid hammer；Rearrangeable switch, for adjusting the soakage being vented in bypass line；Electric expansion valve is used
In to exhaust progress decrease temperature and pressure processing.The part that can be directly extracted by bypass line in compressor air-discharging pipeline as a result, is high
Gas-liquid two-phase refrigerant in compressor air suction pipeline is completely converted into gaseous coolant, avoids pressing by the cold media gas of super pressure-high temperature
Contracting machine absorbing gas belt liquid, and no setting is required gas-liquid separator, so that oil return can flow directly into inside compressor, thus avoiding liquid
While hitting phenomenon, the normal oil return of system ensure that, to protect compressor.And the utilization efficiency of lubricating oil is improved, it reduces
Lubricating oil charging amount, has saved the energy.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of system for preventing liquid hammer according to an embodiment of the present invention；
Fig. 2 is a kind of structural block diagram of system with gas-liquid separator according to an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of system for preventing liquid hammer according to an embodiment of the present invention；
Fig. 4 is a kind of flow chart of method for preventing liquid hammer according to an embodiment of the present invention.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments, it should be understood that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix
Ground uses.
When in order to solve to avoid liquid hit phenomenon using gas-liquid separator in the related technology, the utilization efficiency of lubricating oil can be reduced
The problem of, Fig. 1, Fig. 3 all illustrate a kind of structural block diagram of the system for preventing liquid hammer provided according to embodiments of the present invention.
As shown in Figure 1, system includes: the gas exhaust piping 22 of connect compressor 1 and the bypass line 10 of suction line 23, side
Rearrangeable switch 101 and electric expansion valve 102 are provided on siphunculus road 10；
Bypass line 10, for extracting the exhaust of compressor 1, so as to pass sequentially through rearrangeable switch 101, electronics swollen for exhaust
The air-breathing of swollen valve 102 and compressor 1 mixes, and meets preset condition to control suction superheat, to prevent liquid hammer；Rearrangeable switch
101, for adjusting the soakage being vented in bypass line 10；Electric expansion valve 102, for being carried out at decrease temperature and pressure to exhaust
Reason.
In one possible implementation, system is air-conditioning system, and rearrangeable switch 101 is specifically used for according to air-breathing mistake
Temperature and delivery temperature change the aperture of itself, reach setting soakage to control the soakage of exhaust；Wherein, soakage is set
After determining heat exchange amount according to suction superheat, pressure of inspiration(Pi), further according to the determining row of heat exchange amount, delivery temperature and pressure at expulsion
The soakage of gas；Heat exchange amount is heat needed for the liquid refrigerants in air-breathing is converted to default gaseous coolant；In heat exchange amount phase
Meanwhile setting soakage is reduced with the raising of delivery temperature and pressure at expulsion.
Wherein, default gaseous coolant is so that suction superheat meets increased gaseous coolant needed for preset condition.It can manage
Solution, can determine liquid refrigerants content according to suction superheat, can determine according to liquid refrigerants content and pressure of inspiration(Pi) by it
Heat exchange amount needed for being converted to gaseous coolant is that can determine the sucking of exhaust further according to heat exchange amount and delivery temperature, pressure at expulsion
Amount.When heat exchange amount is identical, it if delivery temperature or pressure at expulsion are excessively high, may be inhaled less refrigerant, that is, can reach required heat exchange
Amount.
In one possible implementation, rearrangeable switch 101, for being less than the left end of pre-set interval in suction superheat
When point, the increase of itself aperture is controlled, is increased to setting soakage to control inspiratory capacity；It is greater than pre-set interval in suction superheat
When right endpoint, controlling itself aperture is zero, is zero to control inspiratory capacity.
It will be appreciated that is, explanation is currently not susceptible to when suction superheat is in pre-set interval or is not less than threshold value
Liquid hit phenomenon, then rearrangeable switch 101 can close, and stop exhaust gas extraction.
The cold media gas of the partial high pressure high temperature in compressor air-discharging pipeline can be directly extracted by bypass line as a result,
The gas-liquid two-phase refrigerant in compressor air suction pipeline is completely converted into gaseous coolant, compressor air suction band liquid, and nothing are avoided
Gas-liquid separator need to be set, so that oil return can flow directly into inside compressor, to guarantee while avoiding liquid hit phenomenon
The normal oil return of system, to protect compressor.And the utilization efficiency of lubricating oil is improved, reduce lubricating oil charging amount, saves
The about energy.And electric expansion valve can carry out decrease temperature and pressure processing to the exhaust of the high temperature and pressure of extraction, avoid high temperature and pressure
Exhaust is directly entered suction line, causes the low-temp low-pressure refrigerant return in suction line unsmooth.
To keep the present invention clearer, now briefly introduce to scheme in the related technology.Fig. 2 shows in the related technology
The structural block diagram of system (i.e. the system of evaporator with gas-liquid), as shown in Fig. 2, system include: compressor 1, exhaust temperature sensing package 2,
High pressure sensor 3, high-pressure switch 4, four-way valve 5, finned heat exchanger 6, blower 7, defrost temperature sensing package 8, environment temperature sensing package 22,
Filter 9 (3 filters being shown in Fig. 1, indicated with label 9), electric expansion valve (throttle valve) 10, package import temperature sensing package
11, case tube heat exchanger 12, package outlet temperature sensing package 13, water inlet temperature sensing package 14, antifreeze temperature sensing package 15, water outlet temperature sensing package 16, water flow
Switch 17, former air-breathing temperature sensing package 18, gas-liquid separator 19, heating low tension switch 20 and refrigeration low tension switch 21.It will be appreciated that
Fig. 1 is air-conditioning system schematic diagram in the related technology.
By taking refrigeration cycle as an example.The gaseous coolant of high temperature and pressure is discharged in compressor 1, enters fin by four-way valve 5 and exchanges heat
Device 6 (condenser) radiates, and wherein has blower 7 outside finned heat exchanger 6, by the rotation of blower 7, drives outdoor air
By finned heat exchanger 6, exchange heat with the high pressure gaseous condensation in pipeline, so that the liquid for becoming medium temperature high pressure is cold
Matchmaker.
The liquid coolant of medium temperature high pressure becomes low-temp low-pressure liquid refrigerants by electric expansion valve 10 by filter 9,
The heat absorption in case tube heat exchanger 12 (evaporator) of low-temp low-pressure liquid refrigerants is passed through as after low-temp low-pressure gas-liquid two-phase refrigerant
Four-way valve 5, returns to gas-liquid separator 19, finally flows through suction line and enters compressor and compressed, is circuited sequentially.
Although and the presence of gas-liquid separator 19 can separate gas-liquid two-phase refrigerant, will cause the waste of lubricating oil
(as described in the background art), the present invention in order to solve this problem, improves system shown in FIG. 1, improved
System is as shown in Figure 3.
Compared to Figure 1 system shown in Fig. 3, eliminates gas-liquid separator 19, increases a bypass line 10, bypass pipe
Rearrangeable switch 101 and electric expansion valve 102 are provided on road 10, increased in the suction line 23 of compressor 1 check valve 103,
Air-breathing temperature sensing package 104 and pressure sensor 105, check valve 103 are arranged in front of air-breathing temperature sensing package 104, that is to say, that air-breathing
Temperature sensing package 104 and pressure sensor 105 compared to check valve 103 for, the distance of Range compress machine 1 is closer.Bypass line from
It (is drawn after high-pressure switch 4 shown in Fig. 3, but only property illustrates as an example) on the gas exhaust piping 22 of compressor 1
It leads between the check valve 103 and air-breathing temperature sensing package 104 of the suction line 23 of compressor 1.And freeze low tension switch 21 and system
The position of heat low switch 20 has moved on to before check valve 103.Check valve 103 can be used for preventing gaseous coolant from flowing backwards.
Wherein, bypass line 10 can weld between the suction line 23 and gas exhaust piping 22 of compressor 1 that (Fig. 1, Fig. 3 are equal
Show), due to eliminating gas-liquid separator 19,12 export pipeline of case tube heat exchanger is equal to the gas exhaust piping 22 of compressor 1, institute
Also to be understood as bypass line 10 and be welded between the gas exhaust piping 22 of compressor 1 and the export pipeline of case tube heat exchanger 12.
Bypass line 10 can directly from the gas exhaust piping 22 of compressor 1 extraction section high temperature and pressure cold media gas, benefit
With the heat of the portion discharge of extraction, the gas-liquid two-phase refrigerant at 1 suction line 23 of compressor is completely converted into gaseous coolant.
Liquid hit phenomenon is avoided as a result, and does not have gas-liquid separator 19, lubricating oil is returned directly to inside compressor 1, to pressure
Contracting machine 1 carries out sufficient lubrication, protects compressor 1, and saved the energy.
In one possible implementation, master controller can be calculated according to air-breathing temperature sensing package 104 and pressure sensor 105
Suction superheat, and the liquid refrigerants content in air-breathing is determined according to suction superheat, according to liquid refrigerants content and pressure of inspiration(Pi)
Power determines required heat exchange amount, and calculates institute according to the delivery temperature of the exhaust detection of temperature sensing package 2, pressure at expulsion and with heat exchange amount
The soakage of the exhaust needed.That is the how many exhausts of sucking may make that liquid refrigerants is converted into default gaseous coolant, preset gaseous coolant
It is so that suction superheat meets increased gaseous coolant needed for preset condition.It is sent out according to gained capacity to rearrangeable switch 101
Control instruction is sent, control rearrangeable switch 101 adjusts aperture, so that the soakage of exhaust is required soakage, i.e. setting is inhaled
Enter amount.With the sucking of exhaust, liquid refrigerants is gradually converted to default gaseous coolant, and suction superheat can be gradually increased to default
It in range or increases to threshold value (such as: 4 DEG C), when suction superheat be in preset range or when not less than threshold value, illustrates currently
Liquid refrigerants is completely converted into gaseous coolant, is not susceptible to liquid hit phenomenon, then master controller can send to rearrangeable switch 101 and refer to
It enables, so that aperture regulation is zero by rearrangeable switch 101, that is, closes rearrangeable switch 101, no longer suck the refrigerant of high temperature and pressure.
In one possible implementation, low pressure heating switch 20, low voltage refrigeration switch 21 be respectively positioned on check valve 103 it
Before (as shown in Figure 3), because the pressure and temperature of the refrigerant after check valve 103 will receive the refrigerant flowed out in bypass line 10
It influences.Low pressure is heated into switch 20, low voltage refrigeration switch 21 is placed in front of check valve 103, it is ensured that the accurate of low tension switch moves
Make, stoppage protection is carried out to unit in time.
Only the explanation of property is located in air-breathing temperature sensing package 104 Fig. 3 in one possible implementation as an example
When between check valve 103 and pressure sensor 105, the tie point of bypass line 10 and gas exhaust piping 22 in check valve 103 and is inhaled
Between gas temperature sensing package 104 (shown in Fig. 3)；When pressure sensor 105 is between check valve 103 and air-breathing temperature sensing package 104, even
Contact is between check valve 103 and pressure sensor 105.And pressure sensor 105, for obtaining the suction of 1 entrance of compressor
Atmospheric pressure；Air-breathing temperature sensing package 104, for obtaining the suction temperature of 1 entrance of compressor.Suction superheat is true by following formula
It is fixed: the suction superheat=corresponding saturation temperature of suction temperature-pressure of inspiration(Pi).
The cold media gas of the partial high pressure high temperature in compressor air-discharging pipeline can be directly extracted by bypass line as a result,
The gas-liquid two-phase refrigerant in compressor air suction pipeline is completely converted into gaseous coolant, compressor air suction band liquid, and nothing are avoided
Gas-liquid separator need to be set, so that oil return can flow directly into inside compressor, to guarantee while avoiding liquid hit phenomenon
The normal oil return of system, to protect compressor.And the utilization efficiency of lubricating oil is improved, reduce lubricating oil charging amount, saves
The about energy.And electric expansion valve can carry out decrease temperature and pressure processing to the exhaust of the high temperature and pressure of extraction, avoid high temperature and pressure
Exhaust is directly entered suction line, causes the low-temp low-pressure refrigerant return in suction line unsmooth.
Fig. 4 shows a kind of method for preventing liquid hammer according to an embodiment of the present invention, and method is applied to shown in Fig. 1 or Fig. 3
System, method includes:
Step S401, the suction superheat of detection system；
Step S402, judge whether suction superheat meets preset condition；
Step S403, if it is not, then opening bypass line, so that the exhaust of compressor passes through bypass line and compressor
Air-breathing mix, until suction superheat meets preset condition.
In one possible implementation, step S102, judging whether suction superheat meets preset condition includes: to sentence
Whether disconnected suction superheat is in pre-set interval.
In one possible implementation, if it is not, then opening bypass line includes: according to suction superheat, air-breathing
The aperture of pressure, pressure at expulsion and the rearrangeable switch on delivery temperature control bypass line, is reached with controlling the soakage of exhaust
Set soakage.
In one possible implementation, it is controlled according to suction superheat, pressure of inspiration(Pi), pressure at expulsion and delivery temperature
The aperture of rearrangeable switch on bypass line, reaching setting soakage with the soakage of control exhaust includes:
When suction superheat is less than the left end point of pre-set interval, control aperture increases, to control the soakage liter of exhaust
Up to set soakage；When suction superheat is greater than the right endpoint of pre-set interval, control aperture is zero, to control the suction of exhaust
Enter amount and is reduced to zero.
In one possible implementation, soakage is set to determine heat exchange amount according to suction superheat, pressure of inspiration(Pi)
Afterwards, further according to the soakage of exhaust determined by heat exchange amount and delivery temperature, pressure at expulsion；Wherein, heat exchange amount be will be in air-breathing
Liquid refrigerants be converted to default gaseous coolant needed for heat；When heat exchange amount is identical, soakage is set with delivery temperature
Or pressure at expulsion raising and reduce, wherein default gaseous coolant is so that suction superheat meets increases needed for preset condition
Gaseous coolant.
The cold media gas of the partial high pressure high temperature in compressor air-discharging pipeline can be directly extracted by bypass line as a result,
The gas-liquid two-phase refrigerant in compressor air suction pipeline is completely converted into gaseous coolant, compressor air suction band liquid, and nothing are avoided
Gas-liquid separator need to be set, so that oil return can flow directly into inside compressor, to guarantee while avoiding liquid hit phenomenon
The normal oil return of system, to protect compressor.And the utilization efficiency of lubricating oil is improved, reduce lubricating oil charging amount, saves
The about energy.And electric expansion valve can carry out decrease temperature and pressure processing to the exhaust of the high temperature and pressure of extraction, avoid high temperature and pressure
Exhaust is directly entered suction line, blocks the refrigerant blocking of low-temp low-pressure in suction line.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a mobile terminal (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described above in conjunction with figure, but the invention is not limited to above-mentioned specific realities
Mode is applied, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art exist
Under enlightenment of the invention, without breaking away from the scope protected by the purposes and claims of the present invention, many shapes can be also made
Formula, all of these belong to the protection of the present invention.
Claims (16)
1. a kind of system for preventing liquid hammer, which is characterized in that the system comprises: connect compressor gas exhaust piping and suction line
Bypass line, be provided with rearrangeable switch and electric expansion valve on the bypass line；
The bypass line, for extracting the exhaust of the compressor so that it is described exhaust pass sequentially through the rearrangeable switch,
The air-breathing of the electric expansion valve and the compressor mixes, and meets preset condition to control suction superheat, to prevent liquid
It hits；
The rearrangeable switch, for adjusting the soakage of exhaust described in the bypass line；
The electric expansion valve, for carrying out decrease temperature and pressure processing to the exhaust.
2. system according to claim 1, which is characterized in that
The preset condition is that the suction superheat is in pre-set interval.
3. system according to claim 1, which is characterized in that
The rearrangeable switch is specifically used for being changed certainly according to the suction superheat, pressure of inspiration(Pi), pressure at expulsion and delivery temperature
The aperture of body reaches setting soakage to control the soakage of the exhaust；Wherein, the soakage that sets is according to the suction
After the gas degree of superheat, the pressure of inspiration(Pi) determine heat exchange amount, further according to the heat exchange amount, the delivery temperature and the pressure at expulsion
The soakage of identified exhaust；The heat exchange amount is to be converted to the liquid refrigerants in the air-breathing needed for default gaseous coolant
Heat；When the heat exchange amount is identical, the soakage that sets is with the raising of the delivery temperature or the pressure at expulsion
And it reduces；Wherein, the default gaseous coolant is so that the suction superheat meets increased gas needed for the preset condition
State refrigerant.
4. system according to claim 3, which is characterized in that
The rearrangeable switch controls itself aperture when for being less than the left end point of the pre-set interval in the suction superheat
Increase, is increased to the setting soakage to control the inspiratory capacity；It is greater than the pre-set interval in the suction superheat
When right endpoint, controlling itself aperture is zero, is zero to control the inspiratory capacity.
5. system according to claim 1, which is characterized in that the system also includes: it is arranged in the suction line
Low tension switch and check valve, the check valve is between the low tension switch and the compressor, for preventing gaseous state cold
Matchmaker flows backwards；Wherein, the low tension switch includes heating low tension switch and refrigeration low tension switch.
6. system according to claim 5, which is characterized in that the system also includes: it is arranged in the suction line
Pressure sensor and air-breathing temperature sensing package, the pressure sensor and the air-breathing temperature sensing package be located at the check valve and the pressure
Between contracting machine,
The pressure sensor, for obtaining the pressure of inspiration(Pi) of the compressor inlet；
The air-breathing temperature sensing package, for obtaining the suction temperature of the compressor inlet.
7. system according to claim 6, which is characterized in that
The suction superheat is determined by following formula:
The suction superheat=corresponding the saturation temperature of the suction temperature-pressure of inspiration(Pi).
8. system according to claim 6, which is characterized in that
When the air-breathing temperature sensing package is between the check valve and the pressure sensor, the bypass line and the row
The tie point of air pipe is between the check valve and the air-breathing temperature sensing package；
When the pressure sensor is between the check valve and the air-breathing temperature sensing package, the tie point is described unidirectional
Between valve and the pressure sensor.
9. system described in any one of -8 according to claim 1, which is characterized in that the system is air-conditioning system.
10. a kind of method for preventing liquid hammer, which is characterized in that the method is applied to power 1 to being described in power any one of 8
System, which comprises
Detect the suction superheat of the system；
Judge whether the suction superheat meets preset condition；
If it is not, then bypass line is opened, so that the suction that the exhaust of compressor passes through the bypass line and the compressor
Gas phase mixing, until the suction superheat meets the preset condition.
11. according to the method described in claim 10, it is characterized in that, judging whether the suction superheat meets preset condition
Include:
Judge whether the suction superheat is in pre-set interval.
12. according to the method for claim 11, which is characterized in that if it is not, then unlatching bypass line includes:
Tuning to open on the bypass line is controlled according to the suction superheat, pressure of inspiration(Pi), delivery temperature and pressure at expulsion
The aperture of pass reaches setting soakage to control the soakage of the exhaust.
13. according to the method for claim 12, which is characterized in that according to the suction superheat, pressure of inspiration(Pi), exhaust temperature
Degree and pressure at expulsion control the aperture of the rearrangeable switch on the bypass line, reach setting to control the soakage of the exhaust
Soakage includes:
When the suction superheat is less than the left end point of the pre-set interval, controls the aperture and increase, to control the row
The soakage of gas is increased to the setting soakage；
When the suction superheat is greater than the right endpoint of the pre-set interval, controlling the aperture is zero, to control the row
The soakage of gas is reduced to zero.
14. according to the method for claim 12, which is characterized in that
The soakage that sets is changed as after determining heat exchange amount according to the suction superheat, the pressure of inspiration(Pi) further according to described
The soakage being vented determined by heat, the delivery temperature and the pressure at expulsion；
Wherein, the heat exchange amount is heat needed for the liquid refrigerants in the air-breathing is converted to default gaseous coolant；Institute
State heat exchange amount it is identical when, the setting soakage is reduced with the raising of the delivery temperature or the pressure at expulsion；It is described
Default gaseous coolant is so that the suction superheat meets increased gaseous coolant needed for the preset condition.
15. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor is realized as described in any one of claim 10-14 when executing described program
The method for preventing liquid hammer.
16. a kind of storage medium comprising computer executable instructions, the computer executable instructions are by computer disposal
For executing the method for preventing liquid hammer as described in any one of claim 10-14 when device executes.
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| CN201811334365.2A CN109373636B (en) | 2018-11-09 | 2018-11-09 | System and method for preventing liquid impact |
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| CN201811334365.2A CN109373636B (en) | 2018-11-09 | 2018-11-09 | System and method for preventing liquid impact |
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| CN111006353A (en) * | 2019-11-06 | 2020-04-14 | 宁波奥克斯电气股份有限公司 | Oil return control method and device of fixed-frequency air conditioner and fixed-frequency air conditioner |
| CN111473497A (en) * | 2020-04-29 | 2020-07-31 | 广东美的暖通设备有限公司 | Air conditioning system, refrigeration auxiliary device thereof and control method |
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| CN112665229A (en) * | 2020-12-16 | 2021-04-16 | 珠海格力电器股份有限公司 | Adjusting device and have its refrigerating system |
| CN115077134A (en) * | 2022-06-08 | 2022-09-20 | 珠海凌达压缩机有限公司 | Compressor system, air conditioner and control method of compressor system |
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