CN106482407B - Air conditioning system for preventing liquid impact of air conditioning compressor and control method thereof - Google Patents
Air conditioning system for preventing liquid impact of air conditioning compressor and control method thereof Download PDFInfo
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- CN106482407B CN106482407B CN201610952194.4A CN201610952194A CN106482407B CN 106482407 B CN106482407 B CN 106482407B CN 201610952194 A CN201610952194 A CN 201610952194A CN 106482407 B CN106482407 B CN 106482407B
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- 239000007788 liquid Substances 0.000 title claims abstract description 172
- 238000004378 air conditioning Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 92
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 26
- 230000009471 action Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 description 11
- 239000003921 oil Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000010726 refrigerant oil Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
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Abstract
The invention provides an air conditioning system for preventing an air conditioning compressor from being impacted by liquid and a control method thereof, wherein the system comprises a compressor (1), a first heat exchanger (11), a second heat exchanger (4) and a throttling device (8), wherein the storage volume of the first heat exchanger is larger than that of the second heat exchanger, a liquid storage tank (10) is also connected between the first heat exchanger and the throttling device, two ends of the liquid storage tank are also provided with parallel branches (16) in parallel, and the parallel branches are provided with a first control valve (9a) for controlling the on-off of the branches. The invention can not start the liquid storage tank when the refrigerant storage capacity of the heat exchanger close to the air suction end of the compressor is large and start the liquid storage tank to store excessive refrigerant when the refrigerant storage capacity of the heat exchanger close to the air suction end of the compressor is small, thereby preventing the phenomenon of air suction and liquid entrainment of the air suction port of the compressor and effectively preventing the liquid impact of the compressor.
Description
Technical Field
The invention belongs to the technical field of compressors and air conditioners, and particularly relates to an air conditioning system for preventing an air conditioner compressor from being impacted by liquid and a control method thereof.
Background
At present, for a screw type air-cooled heat pump system with a flooded shell and tube heat exchanger, refrigerant liquid is mainly accumulated in the flooded shell and tube heat exchanger during refrigeration, and when heating, the refrigerant liquid is accumulated in the fin heat exchanger and the corresponding pipeline, generally, because the storage volume of the flooded shell and tube is larger than that of the fin and the corresponding pipeline, such a situation may occur: during heating, a large amount of refrigerant liquid rushes towards the fin heat exchange tubes, the storage volume of the fin heat exchange tubes is not enough to accommodate the refrigerants, and according to the refrigerant flow direction during heating, the refrigerant liquid flows to the air suction port of the compressor, so that liquid impact of the compressor is caused.
Because the air conditioning system with the flooded shell and tube heat exchanger in the prior art has the technical problems of liquid impact of a compressor, air suction and liquid entrainment and the like, the invention researches and designs the air conditioning system for preventing the liquid impact of the air conditioning compressor and the control method thereof.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the air conditioning system in the prior art is prone to have compressor liquid impact, and to provide an air conditioning system and a control method thereof for preventing the compressor liquid impact of the air conditioner.
The invention provides an air conditioning system for preventing an air conditioning compressor from being impacted by liquid, which comprises a compressor, a first heat exchanger, a second heat exchanger and a throttling device, wherein the storage volume of the first heat exchanger is larger than that of the second heat exchanger, a liquid storage tank is also connected between the first heat exchanger and the throttling device, two ends of the liquid storage tank are also provided with parallel branches in parallel, and a first control valve for controlling the on-off of the branches is arranged on the parallel branches.
Preferably, a second control valve is further arranged at the inlet end of the liquid storage tank; and/or a third control valve is arranged at the outlet end of the liquid storage tank.
Preferably, the injection device further comprises an injection branch, one end of the injection branch is connected inside the liquid storage tank, the other end of the injection branch is connected to the parallel branch, and a fourth control valve is further arranged on the injection branch.
Preferably, an ejector is further arranged on the ejection branch, one end of the ejector is close to the fourth control valve, and the other end of the ejector is close to the liquid storage tank.
Preferably, the injection branch is connected to the parallel branch and close to one end of the first control valve, a bypass branch is further connected between the other end of the first control valve and the other end of the injector, and a fifth control valve is further arranged on the bypass branch.
Preferably, when the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve are provided at the same time,
the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve are all solenoid valves.
Preferably, the first heat exchanger is a flooded heat exchanger; and/or the second heat exchanger is a finned heat exchanger; and/or the throttling device is an electronic expansion valve.
The invention also provides a control method for preventing the air-conditioning compressor from liquid impact, which uses the air-conditioning system to judge whether the first heat exchanger is in a refrigerating or heating state so as to control the liquid storage tank to work or not to work.
Preferably, when the first heat exchanger is used for refrigerating, the first control valve is opened, the refrigerant is controlled to flow through the parallel branch, and the liquid storage tank does not work;
when the first heat exchanger heats, the first control valve is closed, the parallel branch is disconnected, the liquid storage tank is controlled to work, and a refrigerant flows through the liquid storage tank and is stored.
Preferably, when the air conditioning system further comprises a second control valve and a third control valve:
when the first heat exchanger is used for refrigerating, the first control valve is controlled to be opened all the time, and the second control valve and the third control valve are controlled to be closed all the time;
and when the first heat exchanger heats, the first control valve is controlled to be closed all the time, and the second control valve and the third control valve are controlled to be opened all the time.
Preferably, when the air conditioning system further comprises a fourth control valve and a fifth control valve, and when the first heat exchanger performs refrigeration and the load of the compressor reaches a%, the fourth control valve and/or the fifth control valve are/is opened, and the connection of the injection branch is controlled, wherein a is a preset constant and is in a range of 0-100.
Preferably, after the action of opening the fourth control valve and/or the fifth control valve and controlling the injection branch to be communicated lasts for delta t, the opened fourth control valve and/or the fifth control valve are/is closed to close the injection branch.
The air conditioning system for preventing the liquid impact of the air conditioning compressor and the control method thereof provided by the invention have the following beneficial effects:
1. the air conditioning system for preventing the liquid impact of the air conditioning compressor and the control method thereof are characterized in that a liquid storage tank is also connected between a first heat exchanger and a throttling device, parallel branches are also arranged at two ends of the liquid storage tank in parallel, and a first control valve for controlling the on-off of the branches is arranged on the parallel branches, so that the liquid storage tank is not started when the refrigerant storage capacity of the heat exchanger close to the air suction end of the compressor is large, and the liquid storage tank is started to store excessive refrigerant when the refrigerant storage capacity of the heat exchanger close to the air suction end of the compressor is small according to requirements, thereby preventing the phenomenon that the air suction port of the compressor carries liquid from occurring, and effectively preventing the liquid impact of the compressor;
2. compared with the scheme that the first heat exchanger stores the refrigerant through the liquid storage tank during heating and cooling, the air conditioning system capable of preventing the liquid impact of the air conditioning compressor and the control method thereof can ensure that the first heat exchanger can obtain the refrigerant with larger flow for heat exchange during cooling, avoid the situation that the effective refrigerant is stored in the liquid storage tank due to the action of the liquid storage tank and cannot enter the first heat exchanger because the storage volume of the first heat exchanger is enough, and ensure that the heat exchange efficiency of the first heat exchanger is lower, and effectively improve the heat exchange efficiency of the air conditioning system, particularly the first heat exchanger during cooling;
3. according to the air conditioning system for preventing the liquid impact of the air conditioning compressor and the control method thereof, the liquid storage tank is also connected between the first heat exchanger and the throttling device, and the refrigerant liquid condensed in the first heat exchanger, preferably a flooded shell and tube, can be effectively transferred out of the shell and tube through the liquid storage tank, so that the first heat exchanger is ensured to have more sufficient area for condensation heat exchange, and the heating performance of the first heat exchanger, preferably the flooded shell and tube heat exchanger, is improved;
4. according to the air conditioning system for preventing the liquid impact of the air conditioning compressor and the control method thereof, the injection branch and the ejector are connected between the liquid storage tank and the parallel branch, and the storage volume of the first heat exchanger is large, and the required capacity of the heat exchange refrigerant is large, so that the structure can inject the residual refrigerant in the liquid storage tank into the main circulation loop when the first heat exchanger is used for refrigerating, so that the residual refrigerant enters the first heat exchanger, the refrigerating and heat exchange efficiency of the first heat exchanger is effectively ensured, and the COP value of the air conditioning system is improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system for preventing liquid impact of an air conditioning compressor according to the present invention.
The reference numbers in the figures denote:
1-compressor, 2-oil separator, 3-four-way valve, 4-second heat exchanger (finned heat exchanger), 5a, 5b, 5c, 5 d-one-way valve, 6a, 6 b-ball valve, 7-drying filter, 8-throttling device (throttling element), 9 a-first control valve (solenoid valve 9a), 9 b-second control valve (solenoid valve 9b), 9 c-third control valve (solenoid valve 9c), 9 e-fourth control valve (solenoid valve 9e), 9 d-fifth control valve (solenoid valve 9d), 10-liquid storage tank, 11-first heat exchanger (flooded shell and tube heat exchanger), 12-vapor-liquid separator, 13-liquid spraying pipeline and its elements, 14-oil return pipeline and its elements, 15-oil return pipeline, 16-parallel branch, 17-injection branch, 18-bypass branch.
Detailed Description
As shown in fig. 1, the present invention provides an air conditioning system for preventing liquid impact of an air conditioning compressor, wherein the air conditioning system includes a compressor 1, a first heat exchanger 11, a second heat exchanger 4 and a throttling device 8, wherein a storage volume of the first heat exchanger is larger than a storage volume of the second heat exchanger, a liquid storage tank 10 is further connected between the first heat exchanger and the throttling device, two ends of the liquid storage tank are further provided with parallel branches 16 in parallel, and the parallel branches are provided with a first control valve 9a for controlling the on-off of the branches.
The liquid storage tank is also connected between the first heat exchanger and the throttling device, the two ends of the liquid storage tank are also provided with parallel branches in parallel, and the parallel branches are provided with the first control valve for controlling the on-off of the branches, so that the liquid storage tank can be not started when the refrigerant storage capacity of the heat exchanger is large, and the liquid storage tank is opened when the refrigerant storage capacity of the heat exchanger is small to store excessive refrigerant according to the requirement, thereby preventing the phenomenon of air suction and liquid entrainment at the air suction port of the compressor and effectively preventing the liquid impact of the compressor;
compared with the scheme that the refrigerant is stored in the liquid storage tank when the first heat exchanger is used for heating and refrigerating, the refrigerant with larger flow can be obtained for heat exchange when the first heat exchanger is used for refrigerating, the situation that the effective refrigerant is stored in the liquid storage tank due to the effect of the liquid storage tank and cannot enter the first heat exchanger, and the heat exchange efficiency of the first heat exchanger is lower due to the fact that the storage volume of the first heat exchanger is enough is avoided, and therefore the heat exchange efficiency of the air conditioning system, particularly the first heat exchanger, during refrigerating is effectively improved;
the refrigerant liquid condensed in the first heat exchanger, preferably a flooded shell and tube, can be effectively transferred out of the shell and tube through the liquid storage tank, so that the first heat exchanger is ensured to have a more sufficient area for condensation and heat exchange, and the heating performance of the first heat exchanger, preferably the flooded shell and tube heat exchanger, is improved.
Preferably, a second control valve 9b is further provided at the inlet end of the liquid storage tank 16; and/or a third control valve 9c is arranged at the outlet end of the liquid storage tank 16. Through the structural style that sets up the control valve at the entrance point of liquid storage pot and/or exit end, can open or the control of switching to the pipeline at liquid storage pot place, cooperate first control valve to the control action of parallelly connected branch road to realize between the two parallelly connected pipelines of parallelly connected branch road and liquid storage pot place pipeline, accurate control under the actual demand of difference, realize that the compressor breathes in and does not take liquid, does not take place the purpose and the effect of liquid hammer.
Preferably, the injection device further comprises an injection branch 17, one end of the injection branch is connected to the inside of the liquid storage tank 10, the other end of the injection branch is connected to the parallel branch 16, and a fourth control valve 9e is further arranged on the injection branch 17. Through the mode of still connecting the branch of drawing between liquid storage pot and the parallelly connected branch, because the storage volume of first heat exchanger is great, heat transfer refrigerant demand capacity is big, and the refrigerant that stores in the liquid storage pot during heating is high pressure refrigerant liquid, during refrigeration, solenoid valve 9e is close to flooded evaporator side and is the low pressure side, because the effect of pressure differential (high pressure refrigerant in the liquid storage pot is greater than the pressure of evaporator low pressure side), open fourth control valve 9e, refrigerant liquid in the liquid storage pot can be led to in flooded evaporator 11, therefore above-mentioned structure can draw the surplus refrigerant in the liquid storage pot into the main loop when first heat exchanger refrigeration, thereby make it get into first heat exchanger, thereby guarantee the refrigeration heat exchange efficiency of first heat exchanger effectively, improve air conditioning system's COP value.
Preferably, an ejector 15 is further arranged on the ejection branch 17, one end of the ejector 15 is close to the fourth control valve 9e, and the other end of the ejector 15 is close to the liquid storage tank 10. By arranging the ejector on the ejection branch, the refrigerant can be opened under the condition that the pressure in the liquid storage tank is low and the refrigerant cannot flow back to the parallel branch, so that the refrigerant is ejected from the liquid storage tank into the parallel branch through the ejector and then returns to the first heat exchanger 11, and the aim of improving the heat exchange efficiency of the refrigerant is fulfilled; when the ejector does not need to eject the refrigerant (the heat exchange efficiency of the first heat exchanger does not need to be improved, and the power of the heating or refrigerating compressor is preferably lower), the ejector is closed, so that the ejector does not work.
Preferably, the injection branch 17 is connected to the parallel branch 16 and is close to one end of the first control valve 9a, a bypass branch 18 is further connected between the other end of the first control valve 9a and the other end of the injector 15, and a fifth control valve 9d is further disposed on the bypass branch 18. Through still connect the structural style who sets up bypass branch road and set up the fifth control valve on it at above-mentioned position, can make to draw the branch road and can draw the other end department of penetrating the first control valve on the parallel branch road, realize drawing the different embodiment who penetrates the refrigerant.
Preferably, when a first control valve 9a, a second control valve 9b, a third control valve 9c, a fourth control valve 9e and a fifth control valve 9d are provided, the first control valve 9a, the second control valve 9b, the third control valve 9c, the fourth control valve 9e and the fifth control valve 9d are all solenoid valves. This is a preferred form of construction of the first, second, third, fourth and fifth control valves of the air conditioning system of the present invention for preventing liquid slugging of the air conditioning compressor.
Preferably, the first heat exchanger 11 is a flooded heat exchanger; and/or, the second heat exchanger 4 is a finned heat exchanger; and/or the throttling device 8 is an electronic expansion valve. The preferred structural form of the first heat exchanger and the preferred structural form of the second heat exchanger of the present invention are that the refrigerant storage capacity of the flooded heat exchanger is much larger than that of the fin heat exchanger (or the dry heat exchanger), so that the flooded heat exchanger is generally adopted to cool or heat a room, and the electronic expansion valve selected as the throttle device is a preferred structural form, and can realize the functions of throttling, pressure reduction and expansion.
Preferably, the air conditioning system is a flooded evaporator screw type air-cooled heat pump system.
The invention also provides a control method for preventing the compressor of the air conditioner from liquid impact, which uses the air conditioning system to judge whether the first heat exchanger is in a refrigerating or heating state so as to control the liquid storage tank to work or not to work, thereby avoiding the air suction and liquid entrainment of the compressor and preventing the liquid impact phenomenon of the compressor.
According to the control method for preventing the liquid impact of the air-conditioning compressor, the liquid storage tank is not started when the first heat exchanger is used for refrigerating (namely the refrigerant storage capacity of the heat exchanger connected with the air suction port of the compressor is large (namely the first heat exchanger, preferably a flooded shell and tube heat exchanger)) as required, and the liquid storage tank is started to store excessive refrigerant when the first heat exchanger is used for heating (namely the refrigerant storage capacity of the heat exchanger connected with the air suction port of the compressor is small (namely the second heat exchanger, preferably a finned heat exchanger)), so that the phenomenon that the air suction port of the compressor sucks air and carries liquid is prevented, and the liquid impact of the compressor is effectively prevented;
compared with the scheme that the refrigerant is stored in the liquid storage tank when the first heat exchanger is used for heating and refrigerating, the refrigerant with larger flow can be obtained for heat exchange when the first heat exchanger is used for refrigerating, the situation that the effective refrigerant is stored in the liquid storage tank due to the effect of the liquid storage tank and cannot enter the first heat exchanger, and the heat exchange efficiency of the first heat exchanger is lower due to the fact that the storage volume of the first heat exchanger is enough is avoided, and therefore the heat exchange efficiency of the air conditioning system, particularly the first heat exchanger, during refrigerating is effectively improved;
the refrigerant liquid condensed in the first heat exchanger, preferably a flooded shell and tube, can be effectively transferred out of the shell and tube through the liquid storage tank, so that the first heat exchanger is ensured to have a more sufficient area for condensation and heat exchange, and the heating performance of the first heat exchanger, preferably the flooded shell and tube heat exchanger, is improved.
Preferably, when the first heat exchanger 11 is used for refrigerating, the first control valve 9a is opened, so that the refrigerant flows through the parallel branch 16 and the liquid storage tank 10 does not work;
when the first heat exchanger 11 heats, the first control valve 9a is closed, the parallel branch 16 is disconnected, the liquid storage tank 10 is controlled to work, and a refrigerant flows through the liquid storage tank and is stored.
The control method for preventing the liquid impact of the air-conditioning compressor comprises the steps of preferably controlling the first heat exchanger through the first control valve when the first heat exchanger is used for refrigerating or heating respectively, wherein when the first heat exchanger is used for refrigerating, the first heat exchanger is close to the air suction port end of the compressor, and because the capacity of a storage refrigerant of the first heat exchanger is larger than that of the second heat exchanger, the risk of liquid entrainment of the compressor during air suction can not occur, so that a liquid storage tank is not needed, and the first control valve is adjusted to be opened to short circuit a pipeline where the liquid storage tank is located to enable the pipeline to be out of work; when the first heat exchanger heats, the second heat exchanger is close to the air suction port end of the compressor, and the risk of air suction and liquid entrainment of the compressor can occur due to the fact that the capacity of the storage refrigerant of the second heat exchanger is smaller than that of the first heat exchanger, so that the liquid storage tank is required to work to store liquid (in a mode of closing the first control valve), redundant refrigerant is stored, the flow of the refrigerant entering the fin heat exchanger is reduced, and the risk of air suction and liquid entrainment and liquid impact of the compressor is reduced.
Preferably, when the air conditioning system further comprises a second control valve 9b, a third control valve 9 c:
when the first heat exchanger 11 is used for refrigerating, the first control valve 9a is controlled to be opened all the time, and the second control valve 9b and the third control valve 9c are controlled to be closed all the time;
when the first heat exchanger 11 heats, the first control valve 9a is controlled to be closed all the time, and the second control valve 9b and the third control valve 9c are controlled to be opened all the time.
The specific control operation steps of the second control valve and the third control valve are required in the control method for preventing the liquid impact of the air-conditioning compressor, so that the second control valve and the third control valve are required to be arranged, the accurate control on the pipeline where the liquid storage tank is located is required to be ensured, and the situation that the refrigerant leaks into the liquid storage tank when the liquid storage tank is not required to store the refrigerant is prevented; when the first heat exchanger is used for refrigerating, the liquid storage tank is not needed, so that the first control valve is controlled to be opened all the time, and the second control valve and the third control valve are controlled to be closed all the time, which is also a preferable control step, and of course, only one of the second control valve and the third control valve can be controlled to be closed; when the first heat exchanger heats, the liquid storage tank is needed to store the refrigerant at the moment, so that liquid impact is prevented, the first control valve is controlled to be closed all the time, and the second control valve and the third control valve are controlled to be opened all the time, which is also an optimal control step.
Preferably, when the air conditioning system further comprises an injection branch, an injector, a fourth control valve 9e and a fifth control valve 9d, and when the first heat exchanger performs refrigeration and the load of the compressor reaches a%, the fourth control valve and/or the fifth control valve are/is opened, the injection branch is controlled to be connected, wherein a is a preset constant, and the range is 0-100.
The invention relates to a preferable control method and a step with an injection branch and an injector, wherein the action of supplementing a refrigerant by injection is usually only suitable for refrigeration of a first heat exchanger, because the refrigerant flows to the first heat exchanger from a liquid storage tank or a parallel branch only at the moment, and the refrigerant shortage condition exists only in the first heat exchanger; if the first heat exchanger is used for heating, the refrigerant flows to the second heat exchanger from the liquid storage tank or the parallel branch, the storage capacity of the second heat exchanger is small, and if the refrigerant is supplemented at the moment, the risk that liquid in the refrigerant enters the compressor is increased, and liquid impact is caused;
and when the first heat exchanger is used for refrigerating and the load of the compressor is required to be high to a certain degree (preferably A%, A is a variable between 0 and 100), the condition that the power of the compressor is high at the moment, a large amount of refrigerant needs to be supplemented to ensure circulation, the compressor is ensured not to idle or the exhaust temperature is prevented from being too high is shown, and therefore the fourth control valve and/or the fifth control valve need to be controlled to be opened at the moment so as to control the connection of the injection branch and finally enable the refrigerant to be injected into the parallel branch through the liquid storage tank.
Preferably, after the action of opening the fourth control valve and/or the fifth control valve and controlling the injection branch to be communicated lasts for delta t, the opened fourth control valve and/or the fifth control valve are/is closed to close the injection branch. The injection branch is opened for a time delta t, and then the refrigerant in the liquid storage tank is judged to be mostly or completely injected into the main circulation loop, so that the injection branch can be closed, and the air conditioning system can safely and normally operate. And delta t is a preset time parameter and can be correspondingly changed according to the actual working condition and the actual requirement.
The working principle and preferred embodiments of the present invention are described below
The invention provides an air conditioning system for preventing liquid impact of an air conditioning compressor and a control method thereof, wherein the air conditioning system is preferably a flooded evaporator screw type air-cooled heat pump system, and a liquid storage tank is added at a total liquid pipe of the flooded evaporator to prevent excessive refrigerant from flowing to fins during heating and the liquid impact of the compressor caused by insufficient storage volume of the fins; during heating, the refrigerant condensed in the flooded shell and tube is timely removed, and the heat exchange and condensation in the shell and tube with enough area are ensured.
The invention effectively solves the problem that the liquid refrigerant enters the compressor to cause liquid impact of the compressor due to insufficient storage space of the fin heat exchanger.
The invention has the beneficial effects that: the compressor liquid impact is effectively prevented, and the reliability of the unit is ensured; during heating, the refrigerant condensed in the flooded shell and tube is timely removed, and the heat exchange and condensation in the shell and tube with enough area are ensured.
Briefly described:
refrigerant refrigeration flow direction:
compressor 1-oil separator 2-four-way valve 3-fin heat exchanger 4-one-way valve 5 a-ball valve 6 a-drying filter 7-ball valve 6 b-electronic expansion valve 8-one-way valve 5 b-electromagnetic valve 9 a-flooded shell and tube heat exchanger 11-four-way valve 3-vapor-liquid separator 12-compressor 1
Refrigerant heating flow direction:
the system comprises a compressor 1, an oil separator 2, a four-way valve 3, a flooded shell and tube heat exchanger 11, an electromagnetic valve 9c, a liquid storage tank 10, an electromagnetic valve 9b, a one-way valve 5c, a ball valve 6a, a drying filter 7, a ball valve 6b, an electronic expansion valve 8, a one-way valve 5d, a fin heat exchanger 4, a four-way valve 3, a gas-liquid separator 12 and a compressor 1.
The specific implementation mode is as follows:
the invention relates to a screw type air-cooled heat pump system of a flooded evaporator, which effectively prevents liquid impact of a compressor and ensures the reliability of a unit by adding a liquid storage tank at a total liquid pipe of a flooded shell and tube; during heating, the refrigerant condensed in the flooded shell and tube is timely removed, and the heat exchange and condensation in the shell and tube with enough area are ensured.
A refrigeration cycle:
the refrigerant is compressed into high-temperature high-pressure gas in the compressor 1, the refrigerant oil is separated by the external oil separator 2, the refrigerant oil enters the fin heat exchanger 4 through the four-way valve 3 to become medium-temperature high-pressure refrigerant liquid, each fin refrigerant liquid enters the header pipe through the liquid separating pipe, passes through the one-way valve 5a, is throttled in the throttling element 8 after passing through the drying filter 7, enters the flooded shell and tube heat exchanger 11 through the one-way valve 5b and the electromagnetic valve 9a to be evaporated and heat-exchanged into low-temperature low-pressure refrigerant gas, passes through the four-way valve 3 and the gas-liquid separator 12, and enters the compressor 1 to be compressed and start the next refrigerant cycle.
In the refrigeration process, the electromagnetic valve 9a is always opened, and the electromagnetic valves 9b and 9c are always closed. The solenoid valves 9d and 9e are controlled as follows:
when the compressor is detected to be loaded to the load A%, the electromagnetic valve 9d and the electromagnetic valve 9e are opened, and the electromagnetic valve is closed after delta t time.
Heating circulation:
the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 1, the refrigerant oil is separated out by the external oil separator 2, the refrigerant oil enters the flooded shell and tube heat exchanger 11 through the four-way valve 3 to become medium-temperature and high-pressure refrigerant liquid, the refrigerant liquid passes through the liquid storage tank 10 and the electromagnetic valve 9b, then passes through the one-way valve 5c and the filter 7 and then is throttled in the throttling element 8, the refrigerant liquid finned heat exchanger 3 evaporates and exchanges heat to become low-temperature and low-pressure refrigerant gas through the one-way valve 5d, and the refrigerant liquid enters the compressor 1 through the four-way valve 3 and the gas-liquid separator 12 to be compressed and start the next refrigerant cycle.
In the heating process, the electromagnetic valves 9a, 9d and 9e are always closed, and the electromagnetic valves 9b and 9c are always opened.
Beneficial effect of liquid storage tank
When the unit heats, the liquid storage tank has the effects of helping the fins to store a part of refrigerant, avoiding the phenomenon that refrigerant liquid enters an air suction port of the compressor due to insufficient storage space of the fins, causing liquid impact of the compressor and improving the reliability; on the other hand, the liquid storage tank transfers the refrigerant liquid condensed in the flooded shell and tube out of the shell and tube, so that condensation heat exchange is carried out in a more sufficient area, and the heating performance of the flooded shell and tube is improved.
During refrigeration, the storage function of the liquid storage tank is not needed, considering that part of refrigerant can be accumulated in the liquid storage tank during heating, opening an account when the compressor is loaded with a certain load, and sucking the refrigerant in the liquid storage tank by utilizing the jet turbulent motion diffusion function of the ejector to enter the flooded shell and tube for evaporation.
(iv) other instructions:
the non-mentioned check valve, ball valve, oil return pipeline and its components, and liquid spray pipeline and its components are all designed for the design requirement of the system, and will not be described in detail here.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (11)
1. The utility model provides a prevent air condition system of air condition compressor liquid impact which characterized in that: the system comprises a compressor (1), a first heat exchanger (11), a second heat exchanger (4) and a throttling device (8), wherein the storage volume of the first heat exchanger is larger than that of the second heat exchanger, a liquid storage tank (10) is further connected between the first heat exchanger and the throttling device, parallel branches (16) are further arranged at two ends of the liquid storage tank in parallel, and a first control valve (9a) for controlling the branches to be connected and disconnected is arranged on the parallel branches; the liquid storage tank also comprises an injection branch (17) with one end connected inside the liquid storage tank (10) and the other end connected on the parallel branch (16), and a fourth control valve (9e) is arranged on the injection branch; the air conditioning system is a flooded evaporator screw type air-cooled heat pump system.
2. The air conditioning system of claim 1, wherein: a second control valve (9b) is also arranged at the inlet end of the liquid storage tank (10); and/or a third control valve (9c) is arranged at the outlet end of the liquid storage tank (10).
3. The air conditioning system of claim 1, wherein: an ejector (15) is further arranged on the ejection branch (17), one end of the ejector (15) is close to the fourth control valve (9e), and the other end of the ejector is close to the liquid storage tank (10).
4. The air conditioning system of claim 3, wherein: the injection branch (17) is connected to the parallel branch (16) and close to one end of the first control valve (9a), a bypass branch (18) is further connected between the other end of the first control valve (9a) and the other end of the injector (15), and a fifth control valve (9d) is further arranged on the bypass branch (18).
5. The air conditioning system of claim 4, wherein: when a first control valve (9a), a second control valve (9b), a third control valve (9c), a fourth control valve (9e) and a fifth control valve (9d) are provided at the same time,
the first control valve (9a), the second control valve (9b), the third control valve (9c), the fourth control valve (9e) and the fifth control valve (9d) are all solenoid valves.
6. Air conditioning system according to one of claims 1 to 5, characterized in that: the first heat exchanger (11) is a flooded heat exchanger; and/or the second heat exchanger (4) is a finned heat exchanger; and/or the throttling device (8) is an electronic expansion valve.
7. A control method for preventing liquid impact of an air conditioner compressor is characterized in that: use of the air conditioning system of any of claims 1-6 to determine whether the first heat exchanger is in a cooling or heating state to control whether the reservoir is operational or non-operational.
8. The control method according to claim 7, characterized in that: when the first heat exchanger (11) refrigerates, the first control valve (9a) is opened, and the refrigerant is controlled to flow through the parallel branch (16) and the liquid storage tank (10) does not work;
when the first heat exchanger (11) heats, the first control valve (9a) is closed, the parallel branch (16) is disconnected, the liquid storage tank (10) is controlled to work, and refrigerant flows through the liquid storage tank and is at least partially stored.
9. The control method according to claim 8, characterized in that: when the air conditioning system further comprises a second control valve (9b), a third control valve (9 c):
when the first heat exchanger (11) is used for refrigerating, the first control valve (9a) is controlled to be opened all the time, and the second control valve (9b) and the third control valve (9c) are controlled to be closed all the time;
and when the first heat exchanger (11) heats, the first control valve (9a) is controlled to be closed all the time, and the second control valve (9b) and the third control valve (9c) are controlled to be opened all the time.
10. The control method according to one of claims 8 to 9, characterized in that: when the air conditioning system further comprises a fourth control valve (9e) and a fifth control valve (9d), and when the first heat exchanger refrigerates and the load of the compressor reaches A%, the fourth control valve and/or the fifth control valve are/is opened, and the injection branch is controlled to be communicated, wherein A is a preset constant and is in a range of 0-100.
11. The control method according to claim 10, characterized in that: and after the fourth control valve and/or the fifth control valve are opened and the action of controlling the injection branch to be communicated lasts for delta t, closing the opened fourth control valve and/or the opened fifth control valve to close the injection branch.
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| CN201610952194.4A CN106482407B (en) | 2016-10-26 | 2016-10-26 | Air conditioning system for preventing liquid impact of air conditioning compressor and control method thereof |
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| CN201610952194.4A CN106482407B (en) | 2016-10-26 | 2016-10-26 | Air conditioning system for preventing liquid impact of air conditioning compressor and control method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10480495B2 (en) * | 2017-05-08 | 2019-11-19 | Emerson Climate Technologies, Inc. | Compressor with flooded start control |
| CN107131597B (en) * | 2017-06-12 | 2019-12-20 | 广东美的暖通设备有限公司 | Air conditioner, control method and device thereof, and computer-readable storage medium |
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