CN111397258A - Refrigerant recovery system and control method - Google Patents
Refrigerant recovery system and control method Download PDFInfo
- Publication number
- CN111397258A CN111397258A CN202010248225.4A CN202010248225A CN111397258A CN 111397258 A CN111397258 A CN 111397258A CN 202010248225 A CN202010248225 A CN 202010248225A CN 111397258 A CN111397258 A CN 111397258A
- Authority
- CN
- China
- Prior art keywords
- pressure
- refrigerant
- recovery system
- outlet
- recovered
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- 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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention provides a refrigerant recovery system and a control method, wherein the system comprises: the device comprises a recovered container, a compressor, a convergent-divergent nozzle, a condenser, a recovered container and a supercharging device; the first pipeline is communicated with a first outlet of a recovered container and a first inlet of the recovered container, and the compressor, the convergent-divergent nozzle and the condenser are arranged on the first pipeline in series; and the pressurization pipeline is communicated with an outlet of the pressurization device and an air inlet of the recovered container, and the pressurization device is suitable for adjusting the pressure in the recovered container. The invention utilizes the performance of the low pressure generated by the convergent-divergent nozzle by arranging the pressurization pipeline and the pressurization device, controls the opening of the pressurization device to improve the pressure in the recovered container in the refrigerant recovery process, thereby improving the recovery speed and the recovery rate of the refrigerant.
Description
Technical Field
The invention relates to the technical field of refrigerant recovery, in particular to a refrigerant recovery system and a control method.
Background
The refrigerant is not directly discharged and needs to be recycled by special recycling equipment for recycling because of the toxicity, the combustion explosiveness and the corrosiveness to materials of the refrigerant and the reduction of the ozone amount in the atmospheric layer, thereby bringing global greenhouse effect. However, in the currently adopted gas recovery method, as the internal pressure of the recovery container gradually rises, the internal pressure of the unit to be recovered gradually decreases, and the difficulty that the compressor pumps the refrigerant at low pressure to the high-pressure recovery container becomes higher and higher, so that the defects of long recovery time, low recovery efficiency and large condensation load exist.
Disclosure of Invention
The invention solves the problems that: how to improve the recovery speed and the recovery efficiency of the refrigerant recovery system.
To solve the above problems, the present invention provides a refrigerant recovery system comprising: the device comprises a recovered container, a compressor, a convergent-divergent nozzle, a condenser, a recovered container and a supercharging device;
a first pipeline which communicates a first outlet of the recovered container with a first inlet of the recovered container, and on which the compressor, the convergent-divergent nozzle, and the condenser are disposed in series;
and the pressurization pipeline is communicated with an outlet of the pressurization device and an air inlet of the recovered container, and the pressurization device is suitable for adjusting the pressure in the recovered container.
From this, through set up pressure boost pipeline and supercharging device on traditional refrigerant recovery device, utilize the performance that produces the low pressure when zooming the spray tube injection, control supercharging device's opening in refrigerant recovery process, improve the pressure by the recovery container in through the pressure boost pipeline to accelerated the recovery speed of refrigerant, avoid being too low by retrieving refrigeration plant internal pressure and dropping, the phenomenon that more refrigerant can't be retrieved appears, improved the rate of recovery of refrigerant to a certain extent.
Optionally, the method further comprises: a second conduit communicating the second outlet of the recovered vessel and the second inlet of the recovery vessel.
Therefore, under the matching of the ejector and the pressurization pipeline, the first pipeline and the second pipeline realize the simultaneous recovery of the gas-liquid two-phase refrigerant, on one hand, the recovery time is effectively shortened, and the recovery efficiency is further improved; on the other hand, the liquid refrigerant is not required to be compressed by the compressor in the gasification process and is not required to be condensed by the condenser, so that the air suction and exhaust amount of the compressor can be reduced, the condensation load of the condenser is reduced, and the service life of the whole refrigerant recovery system is prolonged.
Optionally, the method further comprises: and the pressure sensor is arranged at the outlet of the convergent-divergent nozzle, is electrically connected with the supercharging device and is used for acquiring the outlet pressure of the convergent-divergent nozzle, and the acquired outlet pressure is used for controlling the opening or closing of the supercharging device.
Therefore, the opening or closing of the supercharging device can be controlled more quickly and accurately by associating the pressure sensor with the supercharging device, so that the control precision of the refrigerant recovery system is improved.
Optionally, the pressure increasing device comprises a third control valve and a nitrogen tank, wherein the third control valve is electrically connected with the pressure sensor and is suitable for adjusting the opening degree according to the acquired outlet pressure; and the nitrogen tank is connected with the third control valve, and the opening or closing of the nitrogen tank is controlled through the third control valve.
Therefore, the opening and closing state of the third control valve is controlled or the opening degree is adjusted according to the acquired outlet pressure, so that the pressure in the recovered container can be more accurately controlled, and the control accuracy of the refrigerant recovery system is improved.
Another object of the present invention is to provide a control method for a refrigerant recovery system as described above, so as to better improve the recovery speed and the recovery efficiency of the refrigerant recovery system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method of a refrigerant recovery system based on the above refrigerant recovery system, comprising:
after the refrigerant recovery system enters a refrigerant recovery mode, performing isentropic injection on the compressed refrigerant through a scaling spray pipe, and forming low pressure at an outlet of the scaling spray pipe to obtain outlet pressure of the scaling spray pipe;
judging whether the conditions for opening the supercharging device are met or not according to the acquired outlet pressure;
and if the condition of starting the pressurizing device is met, starting the pressurizing device to increase the pressure in the recovered container.
Therefore, after the refrigerant recovery system enters a refrigerant recovery mode, the outlet pressure of the convergent-divergent nozzle is obtained in real time, and the outlet pressure of the convergent-divergent nozzle is used as a control parameter for opening or closing the supercharging device, so that on one hand, the control of the refrigerant recovery system has higher control precision, the flow rate of the refrigerant towards the condenser is accelerated by adjusting the pressure in the recovered container, and meanwhile, the phenomenon that more refrigerant cannot be recovered due to too low internal pressure of the recovered container is avoided; on the other hand, unnecessary opening of the supercharging device can be avoided, and energy consumption is saved.
Optionally, after the refrigerant recovery system enters the refrigerant recovery mode, the method includes the steps of:
controlling to start a compressor after receiving a starting signal of the refrigerant recovery system;
the compressor compresses a refrigerant drawn into the compressor through a first line;
carrying out isentropic injection on the compressed refrigerant by using a scaling spray pipe;
and condensing the refrigerant sprayed by the convergent-divergent nozzle by using a condenser, and recovering the liquid refrigerant obtained after condensation into a recovery container.
Therefore, the opening or closing of the supercharging device can be controlled more quickly and accurately by specifying the operation state of each device in the refrigerant recovery system, and the control precision of the refrigerant recovery system is improved.
Optionally, the method further comprises: when the pressure increasing device is in an open state, the refrigerant in the recovered container is recovered to the recovery container through a second pipeline of the refrigerant recovery system under the action of pressure
Therefore, through the cooperation of the scaling spray pipe and the pressurization pipeline, the liquid refrigerant can be directly recovered to the recovery container through the second pipeline, the gas-liquid two-phase refrigerant is recovered at the same time, the recovery time is effectively shortened, and the recovery efficiency is improved.
Optionally, the condition for turning on the supercharging device includes: the obtained outlet pressure is less than or equal to a first preset pressure.
Therefore, the opening condition of the supercharging device is embodied, the opening or closing control precision of the supercharging device can be further improved, and the energy waste is further avoided.
Optionally, the turning on the supercharging device comprises: and controlling the opening degree of a third control valve of the supercharging device according to the acquired outlet pressure.
Therefore, the opening and closing state of the third control valve is controlled or the opening degree is adjusted according to the acquired outlet pressure, so that the pressure in the recovered container can be more accurately controlled, and the control accuracy of the refrigerant recovery system is improved.
Optionally, the controlling the opening degree of the third control valve of the pressure boosting device according to the acquired outlet pressure includes:
if the obtained outlet pressure is smaller than a second preset pressure, controlling the opening degree of the third control valve according to a first rule;
and if the acquired outlet pressure is greater than or equal to a second preset pressure and the acquired outlet pressure is less than or equal to a first preset pressure, controlling the opening of the third control valve according to a second rule.
Therefore, the acquired outlet pressure is used as a control parameter and is compared with the first preset pressure and the second preset pressure, and then the satisfied opening rule of the third control valve is judged, so that the control precision of the supercharging device can be further improved, and the control stability of the system is improved.
Optionally, the first rule includes: controlling the third control valve to be 100% open; the second rule includes: if the obtained outlet pressure is greater than or equal to a second preset pressure and the obtained outlet pressure is less than a third preset pressure, controlling the opening of the third control valve to reduce in an equal ratio within the range of 100-50% of the opening according to the obtained outlet pressure; if the obtained outlet pressure is equal to a third preset pressure, controlling the third control valve to be 50% open; if the obtained outlet pressure is greater than a third preset pressure and the obtained outlet pressure is less than or equal to the first preset pressure, controlling the opening of the third control valve to reduce in an equal ratio within the range of 50% -0% of the opening according to the obtained outlet pressure; the second preset pressure is smaller than the third preset pressure, and the third preset pressure is smaller than the first preset pressure.
Thus, by making the opening degree of the third control valve fine, the valve opening degree matching the acquired outlet pressure is adaptively selected sufficiently for the difference in the acquired outlet pressure, and more accurate control of the refrigerant recovery system is realized.
Optionally, values of the first preset pressure, the second preset pressure and the third preset pressure are all in positive correlation with a refrigerant rated charging amount of the recovered container.
This further improves the accuracy of the pressure control of the pressure booster device on the pressure in the container to be recovered.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic diagram of a refrigerant recovery system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a control method of a refrigerant recovery system according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram illustrating a refrigerant recovery mode according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a conventional refrigerant recovery apparatus.
Description of reference numerals:
1-recovered vessel, 1 a-first outlet, 1 b-second outlet, 1 c-gas inlet, 2-compressor, 3-convergent-divergent nozzle, 4-condenser, 5-recovered vessel, 5 a-first inlet, 5 b-second inlet, 6-pressure sensor, 7-pressure boosting device, 71-nitrogen tank, 72-third control valve, 8-first pipeline, 81-first branch, 82-second branch, 83-third branch, 84-fourth branch, 9-second pipeline, 10-pressure boosting pipeline, 11-first control valve, 12-second control valve, 13-electrical connection line;
1 '-recovered equipment, 2' -compressor unit, 3 '-four-way reversing valve, 4' -heat exchanger, 5 '-recovery tank and 6' -valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Furthermore, the following description, if any, of "first," "second," etc. is used for descriptive purposes only and not for purposes of indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to counteract the greenhouse effect caused by the dispersion of refrigerant gas used in an air conditioning system, laws and regulations set increasingly strict limits on the waste gas recovery process, however, the application and development of the current refrigerant recovery equipment are slow, besides the environmental awareness of workers is insufficient, in addition, various defects of slow recovery speed, low efficiency and the like exist in the practical application process of many current refrigerant recovery equipment, and the recovery equipment with relatively high recovery speed has the problems of large volume, inconvenience in carrying and the like.
For example, in the conventional gas recovery method, the refrigerant in the recovery container is compressed by a compressor to be changed into a high-temperature and high-pressure gas refrigerant, and then the gas refrigerant is condensed, and then the condensed liquid refrigerant is collected, thereby recovering the refrigerant. However, in the recovery process, as the internal pressure of the recovery container gradually rises, the internal pressure of the recovered refrigeration equipment gradually decreases, the difficulty that the compressor pumps the refrigerant at low pressure to the high-pressure recovery container becomes higher and higher, so that the recovery speed becomes lower and lower, the recovery time is long, the recovery efficiency is low, and the phenomenon that the refrigerant is not completely recovered exists. One solution that has been proposed is to use a high-power compressor for generating maximum suction of refrigerant in a short time; however, the high-power compressor is large in size and high in price, and has large condensation load and short service life.
In order to solve the problems, the invention provides a refrigerant recovery system, which is characterized in that a booster pipeline and a booster device are arranged on a traditional refrigerant recovery device, the performance of low pressure generated when a convergent-divergent nozzle sprays is utilized, the booster device is controlled to be opened in the refrigerant recovery process, and the pressure in a recovered container is increased through the booster pipeline. On one hand, the refrigerant recovery system accelerates the recovery speed of the refrigerant, avoids the phenomenon that the pressure drop in the recovered refrigeration equipment is too low and more refrigerant cannot be recovered, and improves the recovery rate of the refrigerant to a certain extent; on the other hand, as the traditional recovery equipment is only externally connected with a pressurization pipeline, the size of the refrigerant recovery system can be designed according to the quantity of the refrigerant to be recovered, and the universality is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a refrigerant recovery system, including: a recovered container 1, a compressor 2, a convergent-divergent nozzle 3, a condenser 4, a recovered container 5 and a supercharging device 7; a first pipeline 8 for communicating the first outlet 1a of the recovered container 1 with the first inlet 5a of the recovered container 5, and the compressor 2, the convergent-divergent nozzle 3 and the condenser 4 are arranged in series on the first pipeline 8; and a pressurizing pipeline 10 for communicating the outlet of the pressurizing device 7 with the air inlet 1c of the recovered container 1, wherein the pressurizing device 7 is suitable for adjusting the pressure in the recovered container 1 according to the pressure at the outlet of the convergent-divergent nozzle 3.
Specifically, the first pipeline 8 includes a first branch 81, a second branch 82, a third branch 83 and a fourth branch 84 which are communicated in sequence, the recovered container 1 includes a first outlet 1a and an air inlet 1c, and the recovered container 5 includes a first inlet 5 a. The first outlet 1a of the recovered container 1 is communicated with the inlet of the compressor 2 through a first branch 81, the outlet of the compressor 2 is communicated with the inlet of the convergent-divergent nozzle 3 through a second branch 82, the outlet of the convergent-divergent nozzle 3 is connected with the inlet of the condenser 4 through a third branch 83, and the outlet of the condenser 4 is communicated with the first inlet 5a of the recovered container 5; the inlet end of the pressurization pipeline 10 is communicated with the outlet of the pressurization device 7, and the outlet of the pressurization pipeline 10 is communicated with the air inlet 1c of the recovered container 1.
Therefore, the compressor 2 sucks the refrigerant in the recovery container 1, the refrigerant is subjected to isentropic compression, the high-temperature and high-pressure gaseous refrigerant is discharged to enter the nozzle of the inlet of the convergent-divergent nozzle 3, the flow speed is accelerated due to the fact that the flow channel is reduced, low pressure is generated at the outlet of the convergent-divergent nozzle 3, the sprayed gaseous refrigerant enters the condenser 4 to be condensed, and the condensate enters the recovery container 5. Because the convergent-divergent nozzle 3 generates extremely low pressure at the outlet after isentropic injection, the supercharging device 7 is controlled to be opened at the moment, and the inside of the recovered container 1 is supercharged through the supercharging device 7. That is, when the pressurizing means 7 is turned on, a relatively high pressure environment is generated in the recovery tank 1, which can increase the flow rate of the refrigerant toward the condenser 4, thereby increasing the speed of recovering the refrigerant and maximizing the amount of the recovered refrigerant.
It can be understood that the pressurizing device can adjust the pressure in the recovered container 1 according to the pressure at the outlet of the convergent-divergent nozzle 3, and can also open the pressurizing device 7 immediately after entering the recovery system or after a preset time, as long as the pressure in the recovered container can be adjusted, so that a large pressure difference is formed between the recovered container and the recovered container. Preferably, to improve the control accuracy, the supercharging device of the embodiment of the present invention is adjusted according to the pressure at the outlet of the convergent-divergent nozzle 3.
In the embodiment of the invention, the convergent-divergent nozzle 3 is a laval nozzle, the front half part of the laval nozzle is contracted from big to small to the middle to a narrow throat, and the narrow throat is expanded from small to big to outside.
It can be understood that, in the refrigerant recovery system provided in the above embodiment, since the compressor 2 can only suck the gaseous refrigerant, when the liquid refrigerant exists in the recovered container 1, the liquid refrigerant in the recovered container 1 needs to be gasified and converted into the gaseous refrigerant under the condition of low pressure, and then recovered. Therefore, the refrigerant recovery system according to the above embodiment is preferably applicable to a case where the recovered container 1 has no liquid pipe or is inconvenient to recover liquid.
However, when the liquid and gaseous refrigerants are stored in the recovered container 1, the recovery time of the refrigerant is long due to the vaporization process, and the recovery efficiency is low. In order to effectively improve the recovery efficiency and optimize the technical scheme, the refrigerant recovery system further comprises: and a second line 9, the second line 9 communicating the second outlet 1b of the recovered container 1 with the second inlet 5b of the recovered container 5.
Specifically, the refrigerant recovery system is provided with a second line 9 between the container 1 to be recovered and the recovery container 5 in addition to the first line 8 for recovering the gaseous refrigerant. Here, the first outlet 1a of the recovered container 1 can be regarded as a gaseous outlet, and the second outlet 1b can be regarded as a liquid outlet, however, the gaseous outlet and the liquid outlet are defined herein only for the sake of clarity, and are not intended to limit the state of the refrigerant flowing out, that is, the liquid refrigerant or the gaseous refrigerant can flow out from the first outlet 1a or the second outlet 1 b. The present commercially available recovery container 5 comprises a high inlet pipe and a low inlet pipe, in the embodiment of the present invention, the first inlet 5a of the recovery container 5 is a high inlet, the second inlet 5b thereof is a low inlet, correspondingly, the first pipeline 8 is a high inlet pipe, and the second pipeline 9 is a low inlet pipe, thereby reducing the flow resistance of the refrigerant to some extent, and increasing the recovery speed.
By using the convergent-divergent nozzle 3, a pressure difference is generated between the front section and the rear section of the first pipeline 8, and when the pressurization device 7 senses low pressure and is opened, a relatively high-pressure environment is generated in the recovered container 1, so that the liquid refrigerant in the recovered container 1 can flow out from the liquid outlet under the action of pressure and directly flow into the recovered container 5 through the second pipeline 9. Meanwhile, after the gaseous refrigerant comes out of the injection pipe, the gaseous refrigerant enters the condenser 4 to be condensed, and the condensed liquid refrigerant is also recycled into the recovery container 5.
Therefore, in the refrigerant recovery system provided by the embodiment of the invention, under the coordination of the convergent-divergent nozzle 3 and the pressurization pipeline 10, the first pipeline 8 and the second pipeline 9 realize simultaneous recovery of gas-liquid two-phase refrigerants, so that on one hand, the recovery time is effectively shortened, and the recovery efficiency is further improved; on the other hand, since the liquid refrigerant is not compressed by the compressor 2 through the gasification process, and is not condensed by the condenser 4, the suction and discharge amount of the compressor 2 can be reduced, and the condensing load of the condenser 4 can be reduced, thereby prolonging the service life of the whole refrigerant recovery system.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a conventional gas-liquid combined recovery system, which is a refrigerant recovery device with the highest recovery efficiency at present, and the combined recovery method adopted by the system includes both a liquid recovery method and a gas recovery method. In the recovery process, firstly, the refrigerant in the recovered equipment 1 'is recovered in a liquid state (in the direction shown by the X line in figure 4), the exhaust gas of the compressor 2' group is discharged to the recovered equipment 1 'for pressurization, the refrigerant is pressurized to the recovery tank 5', and after about 90% of the refrigerant is recovered, the refrigerant cannot be recovered gradually when the recovery rate is reduced; by manually controlling the four-way reversing valve 3 ', the recovery system is switched to a gas compression recovery method (direction shown by Y line in fig. 4), and the gas refrigerant remaining in the recovery device 1 ' is sucked by the compressor unit 2 ', condensed by the heat exchanger 4 ', and recovered into the recovery tank 5 '. It will be appreciated that valves 6' are provided in both the vapor recovery line and the liquid recovery line to control the opening and closing of the respective lines. The composite recovery method has the advantages of liquid recovery and gas recovery, and can solve the problem of large residual quantity to a certain extent.
However, it can be seen from comparison that, compared with the existing gas-liquid combined recovery system, in the recovery process, the switching time node between the liquid recovery and the gas recovery needs to be controlled by the operator according to experience, so that the most reasonable recovery efficiency and recovery rate are difficult to achieve. The refrigerant recovery system provided by the embodiment of the invention is greatly improved on the existing gas-liquid composite recovery system, not only can simultaneously recover gas-liquid two-phase refrigerants, but also does not need to manually switch the recovery mode, simplifies the operation steps of the recovery system to a certain extent, further accelerates the recovery efficiency of the system, and recovers as much refrigerant as possible.
It can be understood that, since the liquid refrigerant directly enters the recovered container 1 under pressure, the recovery time is shorter than that of the gaseous refrigerant, and therefore, as the recovery process proceeds, the liquid refrigerant is recovered first, and only pure gaseous refrigerant is left in the recovered container 1. In this state, the inside of the recovered container 1 is always in a relatively high pressure environment due to the opening of the pressurization device 7, and the gaseous refrigerant enters the second pipeline 9 through the liquid outlet and is recovered into the recovery container 5.
In addition, in the above embodiment, after the outlet pressure of the convergent-divergent nozzle 3 is reduced to form a relatively low-pressure environment, the pressure boosting device 7 is controlled to be opened. The opening of the pressure intensifier 7 can be controlled automatically or manually by providing a pressure detection device at the outlet of the second branch 82 or the convergent-divergent nozzle 3, and the pressure detection device and the pressure detection method are common methods, which are not illustrated here.
Preferably, in order to provide the control accuracy of the pressure boosting device 7, the refrigerant recovery system according to the embodiment of the present invention further includes: and the pressure sensor 6 is arranged at the outlet of the convergent-divergent nozzle 3 and is electrically connected with the pressure boosting device 7, and is used for detecting the outlet pressure of the convergent-divergent nozzle 3, and the pressure boosting device 7 is controlled to be opened or closed according to the acquired outlet pressure.
Thus, by providing the pressure sensor 6 and associating the pressure sensor 6 with the booster device 7, the opening or closing of the booster device 7 can be controlled more quickly and accurately, thereby improving the control accuracy of the refrigerant recovery system.
Wherein the pressure boosting means 7 comprises a third control valve 72, the third control valve 72 being adapted to adjust the opening degree in dependence of the obtained outlet pressure. Wherein the third control valve 72 may be a solenoid valve. Wherein the pressure sensor 6 is connected via an electrical connection line 13 to a third control valve 72 on the charging device.
Therefore, by controlling the opening and closing state of the third control valve 72 or adjusting the opening degree according to the acquired outlet pressure of the convergent-divergent nozzle, the pressure in the recovered container 1 can be controlled more accurately, and the control accuracy of the refrigerant recovery system can be improved.
The pressure increasing device 7 further comprises a nitrogen tank 71, and the nitrogen tank 71 is connected with a third control valve 72 and is controlled to be opened or closed by the third control valve 72.
Therefore, when the third control valve 72 is in the open state, the nitrogen in the nitrogen tank 71 enters the recovered container 1 along the pressurization pipeline 10, so that the pressure in the recovered container 1 is increased, the resources of the nitrogen tank 71 are easy to obtain, and the overall structure of the refrigerant recovery system is simplified to a certain extent.
In addition, in the refrigerant recovery system according to the above embodiment, the first branch 81 and the first outlet 1a of the recovered container 1, the second pipeline 9 and the second outlet 1b of the recovered container 1, and the pressurizing pipeline 10 and the inlet 1c of the recovered container 1 are detachably connected by flanges. Correspondingly, the fourth branch 84 and the first inlet 5a of the recovery tank 5, the second pipeline 9 and the second inlet 5b of the recovery tank 5 are also detachably connected by flanges. Of course, the detachable connection can be realized by screw thread fit or other structures, and is not limited to the flange connection. The arrangement is beneficial to the replacement of the recovered container 1 and the recovery container 5, and the use scene of the refrigerant recovery system is enlarged.
Preferably, a first control valve 11 is provided on the first branch 81 and a second control valve 12 is provided on the second branch 9. Thus, by controlling the closing of the first control valve 11 and the second control valve 12 after the refrigerant has been recovered in the recovery tank 5, the amount of refrigerant remaining in the first pipe line 8 and the second pipe line 9 discharged to the outside environment when the recovery tank 5 is removed from the recovery system is reduced.
The refrigerant recovery system provided by the embodiment of the invention can be used for recovering the refrigerant in a motor vehicle air conditioner or a household air conditioning unit or an industrial refrigeration air conditioning system.
To further illustrate the recovery speed of the refrigerant recovery system according to the embodiment of the present invention, the recovery speed of the gas-liquid refrigerant recovery system (referred to as the recovery system 1) according to the embodiment of the present invention is compared with the recovery speed of the conventional gas-liquid composite recovery system (referred to as the recovery system 2), wherein the recovery system 1 includes a first pipeline 8 and a second pipeline 9, and the recovered container 1 is an air conditioner unit.
Currently, the refrigerant recovery (about the rated charge of the unit) is selected according to the rated power of the compressor and the corresponding recovery speed, as shown in table 1:
TABLE 1 recovery speed and rated charge corresponding table
It will be appreciated that the proportion of the gas-liquid refrigerant recovered simultaneously to the overall recovery process (which is approximately equal to the liquid refrigerant ratio of the original system) determines the overall recovery efficiency, irrespective of the effect of the liquid refrigerant evaporation on the gas-liquid ratio of the recovered vessel 1.
Assuming that the original liquid refrigerant accounts for 60%, the unit to be recovered has a nominal charge of approximately 200kg, and referring to table 1, the recovery system 2 recovers the liquid refrigerant first and then the gaseous refrigerant. When the recovery rate of the pure liquid refrigerant is 30kg/h and the recovery rate of the pure gaseous refrigerant is 10kg/h, the total recovery time of the recovery system 2 can be calculated to be 120/30+ 80/10-12 h; when the recovery rate of the pure liquid refrigerant is 50kg/h and the recovery rate of the pure gaseous refrigerant is 20kg/h, the total recovery time of the recovery system 2 can be calculated to be 120/50+80/20 which is 6.4h, that is, the refrigerant recovery time of the recovery system 2 is 6.4 to 12 h.
With the recovery system 1, the gas-liquid refrigerant is recovered at the same time, and the liquid refrigerant is recovered first. With reference to table 1, when the recovery rate of pure liquid refrigerant is 30kg/h and the recovery rate of pure gaseous refrigerant is 10kg/h, the total recovery time of refrigerant in the recovery system 1 can be calculated to be 120/30+ (80-120/30 × 10)/10 ═ 8 h; when the recovery rate of the pure liquid refrigerant is 50kg/h and the recovery rate of the pure gaseous refrigerant is 20kg/h, the recovery time of the recovery system 1 can be calculated to be 120/50+ (80-120/50 × 20)/20-4 h, that is, the recovery time of the refrigerant of the recovery system 1 is 4h-8 h.
As can be seen from the comparison, the recovery speed of the refrigerant recovery system including the first pipeline 8 and the second pipeline 9 provided by the embodiment of the present invention is greater than that of the existing gas-liquid combined recovery system, and the recovery efficiency is improved by about 33.3% to 37.5%.
Referring to fig. 2, another embodiment of the present invention further provides a control method of the refrigerant recovery system, including the steps of:
s1, after the refrigerant recovery system enters a refrigerant recovery mode, refrigerant compressed by the compressor 2 is subjected to isentropic injection through the convergent-divergent nozzle 3, and low pressure is formed at an outlet of the convergent-divergent nozzle 3 to obtain outlet pressure of the convergent-divergent nozzle 3;
s2, judging whether the conditions for opening the supercharging device 7 are met or not according to the acquired outlet pressure;
s3, if the condition for opening the pressure increasing device 7 is satisfied, the pressure increasing device 7 is opened to adjust the pressure in the recovered container 1.
By the method, after the refrigerant recovery system enters the refrigerant recovery mode, the outlet pressure of the convergent-divergent nozzle 3 is obtained in real time, and the outlet pressure of the convergent-divergent nozzle 3 is used as a control parameter for opening or closing the supercharging device 7, so that on one hand, the control of the refrigerant recovery system has higher control precision, the flow rate of the refrigerant towards the condenser 4 is accelerated by adjusting the pressure in the recovered container 1, and meanwhile, the phenomenon that more refrigerant cannot be recovered due to too low internal pressure of the recovered container 1 is avoided; on the other hand, unnecessary opening of the supercharging device 7 can be avoided, which is beneficial to saving energy consumption.
Specifically, as shown in fig. 3, the refrigerant recovery mode of step S1 includes:
s11, after receiving the starting signal of the refrigerant recovery system, controlling to start the compressor 2;
s12, drawing the refrigerant from the container 1 into the compressor 2 through the first pipe 8, and compressing the refrigerant flowing through the compressor 2;
in this step, if only the gaseous refrigerant exists in the recovery container 1, the gaseous refrigerant is directly sucked into the compressor 2; if liquid refrigerant is still present in the recovery tank 1, the liquid refrigerant needs to be vaporized and converted into gaseous refrigerant at a low pressure and then absorbed by the compressor 2.
S13, the refrigerant compressed by the compressor 2 is injected through the convergent-divergent nozzle 3 in an isentropic manner;
after the isentropic injection process of the convergent-divergent nozzle 3, a low-pressure environment is formed at the outlet of the convergent-divergent nozzle 3 (the pipeline between the condenser 4, i.e., the third branch 83).
S14, the injected refrigerant is condensed by the condenser 4, and the condensed liquid refrigerant is recovered in the recovery tank 5.
Thus, by specifying the operation state of each device in the refrigerant recovery system, the opening or closing of the supercharging device 7 can be controlled more quickly and accurately, and the control accuracy of the refrigerant recovery system can be improved.
Due to the control method provided by the above embodiment, when the liquid and gaseous refrigerants exist in the recovered container 1, the recovery time of the refrigerant is longer and the recovery efficiency is lower due to the liquid refrigerant gasification process. Therefore, further, the control method of the refrigerant recovery system further includes the steps of:
s4, when the pressure-intensifying means 7 is in the open state, the refrigerant in the recovery vessel 1 is recovered by pressure into the recovery vessel 5 through the second line 9 of the refrigerant recovery system.
Therefore, by matching the convergent-divergent nozzle 3 and the pressurization pipeline 10, the liquid refrigerant can be directly recycled into the recycling container 5 through the second pipeline 9, so that the gas-liquid two-phase refrigerant can be recycled at the same time, the recycling time is effectively shortened, and the recycling efficiency is improved; meanwhile, the air suction and exhaust amount of the compressor 2 can be reduced, and the condensation load of the condenser 4 can be reduced, so that the service life of the whole refrigerant recovery system can be prolonged.
Since the recovery rate of the liquid refrigerant is higher than that of the gaseous refrigerant, the refrigerant recovered through the second pipeline 9 may include the liquid refrigerant and the gaseous refrigerant in the recovered container 1, and thus, switching between gas-liquid recovery modes is not required, the operation steps are simplified, and the refrigerant recovery rate is improved.
In step S2, the conditions for turning on the supercharging device 7 include: the obtained outlet pressure P is less than or equal to the first preset pressure P1.
When the obtained outlet pressure P is greater than the first preset pressure P1, the pressure difference between the inside of the recovered container 1 and the inside of the third branch 83 is not great, and even if the pressure increasing device 7 is opened, the pressure increasing effect on the recovered container 1 is not great, so that the pressure increasing device 7 is only necessary to be opened under the condition that P is less than or equal to P1. Therefore, the opening condition of the supercharging device 7 is embodied, so that the opening or closing control precision of the supercharging device 7 can be further improved, and the energy waste is further avoided.
In step S3, the step of activating the pressure boosting device 7 includes: the opening degree of the third control valve 72 of the pressure intensifying apparatus 7 is controlled based on the acquired outlet pressure.
Therefore, by controlling the opening/closing state of the third control valve 72 or adjusting the opening degree thereof according to the acquired outlet pressure, it is possible to control the pressure in the recovery tank 1 more precisely, and the accuracy of the control of the refrigerant recovery system can be improved.
Preferably, the opening degree of the third control valve 72 of the pressure increasing device 7 is controlled according to the acquired outlet pressure, and the method specifically comprises the following steps:
s31, if the acquired outlet pressure P is smaller than a second preset pressure P2, controlling the opening degree of the third control valve 72 according to a first rule;
s32, if the obtained outlet pressure P is greater than or equal to the second preset pressure P2 and the obtained outlet pressure P is less than or equal to the first preset pressure P1, controlling the opening degree of the third control valve 72 according to a second rule.
It will be appreciated that the amount of refrigerant in the recovered vessel 1 is correlated to the opening degree of the third control valve 72, and that if the opening degree of the third control valve 72 is kept constant for different refrigerant recovery conditions, the recovery rate is most likely to be affected.
Therefore, in the present embodiment, the acquired outlet pressure P is used as a control parameter, and is compared with the first preset pressure P1 and the second preset pressure P2, so as to determine the opening degree rule that the third control valve 72 satisfies, thereby further improving the control precision of the supercharging device 7 and improving the control stability of the system.
Wherein the first rule comprises: the third control valve 72 is controlled to be 100% open.
When the outlet pressure P of the booster line 10 is low, which indicates that the pressure difference between the inside of the container 1 to be recovered is large, the third control valve 72 is fully opened to allow the maximum amount of nitrogen gas to enter the container 1 to be recovered, thereby increasing the pressure inside the container 1 to the maximum extent and increasing the refrigerant recovery rate.
Wherein the second rule comprises:
if the acquired outlet pressure P is greater than or equal to the second preset pressure P2 and the acquired outlet pressure P is less than the third preset pressure P3, controlling the opening degree of the third control valve 72 to decrease in an equal ratio within the range of 100% -50% opening degree according to the acquired outlet pressure P;
if the acquired outlet pressure P is equal to the third preset pressure P3, controlling the third control valve 72 to be 50% open;
if the obtained outlet pressure P is greater than the third preset pressure P3 and the obtained outlet pressure is less than or equal to the first preset pressure P1, controlling the opening degree of the third control valve 72 to decrease proportionally within the range of 50% -0% opening degree according to the obtained outlet pressure;
the second preset pressure P2 is less than the third preset pressure P3, and the third preset pressure P3 is less than the first preset pressure P1, i.e., P2 < P3 < P1.
The opening degrees of the third control valve 72 corresponding to the outlet pressures obtained by the devices which are different in the amount of the recovered refrigerant or the refrigerant are different from each other, and according to the experimental data of the inventor, the opening degree of the third control valve 72 is further refined by comparing the obtained outlet pressure P with the first preset pressure P1, the second preset pressure P2 and the third preset pressure P3, so that the valve opening degree matched with the obtained outlet pressure is adaptively selected sufficiently according to the difference of the obtained outlet pressure, and the refrigerant recovery system is controlled more accurately.
The first preset pressure P1, the second preset pressure P2 and the third preset pressure P3 are all positively correlated with the refrigerant rated charge of the recovery tank 1.
Since the lower limit value of the low pressure formed after the isentropic injection of the convergent-divergent nozzle 3 is increased as the rated refrigerant charge amount is larger, the preset parameters P1, P2, and P3 in the determination of the opening degree of the third control valve 72 are increased accordingly, thereby further improving the accuracy of the pressure regulation of the pressure inside the recovery vessel 1 by the pressure booster 7.
To better explain the relationship among the rated refrigerant charge, the obtained outlet pressure of the booster line 10, and the opening degree of the third control valve 72 in the control method of the refrigerant recovery system according to the above embodiment, the inventors have made a description based on research and development experience with the air conditioning unit as the recovered container 1 and with R22 refrigerant as an example, as shown in table 2:
TABLE 2 refrigerant rated charge, outlet pressure, and opening degree correspondence table of third control valve
As can be seen from table 2, in the case where the battery pack rated charge is greater than 800kg, the first preset pressure P1 is set to 0.8atm (0.8 atm), the second preset pressure P2 is set to 0.3atm, and the third preset pressure P3 is set to 0.5 atm. When the pressure sensor 6 detects that the outlet pressure of the booster line 10 is less than 0.3atm, the third control valve 72 is fully opened; when the outlet pressure is 0.5atm, the opening degree of the third control valve 72 is 50%; when the outlet pressure is greater than 0.8atm, the opening degree of the third control valve 72 is 0%; the opening degree of the third control valve 72 corresponds to the obtained outlet pressure in equal proportion at 0.3-0.5atm, 0.5-0.8 atm.
In the case where the battery set rated charge is less than 800kg, the first preset pressure P1 is set to 0.7atm, the second preset pressure P2 is set to 0.2atm, and the third preset pressure P3 is set to 0.4 atm. When the pressure sensor 6 detects that the outlet pressure of the booster line 10 is less than 0.2atm, the third control valve 72 is fully opened; when the outlet pressure is 0.4atm, the opening degree of the third control valve 72 is 50%, and when the outlet pressure is greater than 0.7atm, the opening degree of the third control valve 72 is 0%; the opening degree of the third control valve 72 corresponds to the obtained outlet pressure in equal proportion at 0.2-0.4 atm and 0.4-0.7 atm.
Here, the equal ratio decrease means that the opening degree of the third control valve is gradually decreased as the acquired outlet pressure increases, and the ratio of the decreased opening degree value to the increased value of the outlet pressure is the same. E.g., 900kg of R22 charge, the third control valve 72 is fully opened when the outlet pressure is 0.1 atm; when the outlet pressure is 0.4atm, the opening degree of the third control valve 72 is 75%; when the outlet pressure is 0.6atm, the opening degree of the third control valve 72 is 37.5%.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A refrigerant recovery system, comprising: a recovered container (1), a compressor (2), a convergent-divergent nozzle (3), a condenser (4), a recovered container (5) and a supercharging device (7);
a first line (8) communicating the first outlet (1a) of the recovered container (1) with the first inlet (5a) of the recovered container (5), and on which first line (8) the compressor (2), the convergent-divergent nozzle (3) and the condenser (4) are arranged in series;
a pressurization line (10) communicating the outlet of the pressurization device (7) with the air inlet (1c) of the recovered container (1), said pressurization device (7) being adapted to regulate the pressure inside the recovered container (1) as a function of the pressure at the outlet of the convergent-divergent nozzle (3).
2. The refrigerant recovery system according to claim 1, further comprising:
a second line (9), the second line (9) communicating the second outlet (1b) of the recovered vessel (1) and the second inlet (5b) of the recovery vessel (5).
3. The refrigerant recovery system according to claim 1, further comprising:
and the pressure sensor (6) is arranged at the outlet of the convergent-divergent nozzle (3), is electrically connected with the supercharging device (7), and is used for acquiring the outlet pressure of the convergent-divergent nozzle (3), and the acquired outlet pressure is used for controlling the opening or closing of the supercharging device (7).
4. A refrigerant recovery system according to claim 3, wherein said pressure increasing means (7) comprises a third control valve (72) and a nitrogen tank (71);
the third control valve (72) is electrically connected with the pressure sensor (6) and is suitable for adjusting the opening degree according to the acquired outlet pressure;
the nitrogen tank (71) is connected with the third control valve (72), and the opening or closing of the nitrogen tank (71) is controlled through the third control valve (72).
5. A control method of a refrigerant recovery system based on the refrigerant recovery system according to any one of claims 1 to 4, characterized by comprising:
after the refrigerant recovery system enters a refrigerant recovery mode, refrigerant compressed by the compressor (2) is subjected to isentropic injection through a zooming spray pipe (3), and low pressure is formed at an outlet of the zooming spray pipe (3) to obtain outlet pressure of the zooming spray pipe (3);
judging whether the conditions for opening the supercharging device (7) are met or not according to the acquired outlet pressure;
if the condition for opening the pressurizing device (7) is met, the pressurizing device (7) is opened to increase the pressure in the recovered container (1).
6. The refrigerant recovery system control method according to claim 5, wherein the refrigerant recovery system enters a refrigerant recovery mode, comprising the steps of:
after a starting signal of the refrigerant recovery system is received, controlling to start a compressor (2);
-the compressor (2) compresses a refrigerant drawn into the compressor (2) through a first line (8);
the compressed refrigerant is subjected to isentropic injection by using a scaling spray pipe (3);
and condensing the refrigerant sprayed from the convergent-divergent nozzle (3) by using a condenser (4), and recovering the condensed liquid refrigerant into a recovery container (5).
7. The refrigerant recovery system control method according to claim 6, further comprising:
when the supercharging device (7) is in an open state, the refrigerant in the recovered container (1) is recovered into the recovery container (5) through a second pipeline (9) of the refrigerant recovery system under the action of pressure.
8. The refrigerant recovery system control method according to claim 5, wherein the condition for opening the pressure boosting device (7) includes: the obtained outlet pressure is less than or equal to a first preset pressure.
9. The refrigerant recovery system control method according to claim 8, wherein the opening the pressure boosting device (7) includes:
controlling the opening degree of a third control valve (72) of the pressure boosting device (7) according to the acquired outlet pressure to open the pressure boosting device (7).
10. The refrigerant recovery system control method according to claim 9, wherein the controlling the opening degree of a third control valve (72) of the pressure intensifying device (7) according to the obtained outlet pressure includes:
if the obtained outlet pressure is smaller than a second preset pressure, controlling the opening degree of the third control valve (72) according to a first rule;
and if the acquired outlet pressure is greater than or equal to a second preset pressure and the acquired outlet pressure is less than or equal to the first preset pressure, controlling the opening of the third control valve (72) according to a second rule.
11. The refrigerant recovery system control method according to claim 10, wherein the first rule includes: controlling the third control valve (72) to 100% open;
the second rule includes:
if the obtained outlet pressure is greater than or equal to the second preset pressure and the obtained outlet pressure is less than a third preset pressure, controlling the opening of the third control valve (72) to be reduced in an equal ratio within the range of 100-50% of the opening according to the obtained outlet pressure;
controlling the third control valve (72) to 50% open if the obtained outlet pressure is equal to the third preset pressure;
if the obtained outlet pressure is greater than the third preset pressure and the obtained outlet pressure is less than or equal to the first preset pressure, controlling the opening of the third control valve (72) to be reduced in an equal ratio within the range of 50% -0% of the opening according to the obtained outlet pressure;
the second preset pressure is smaller than the third preset pressure, and the third preset pressure is smaller than the first preset pressure.
12. A control method of a refrigerant recovery system according to claim 11, characterized in that the first preset pressure, the second preset pressure and the third preset pressure are all proportional to the refrigerant rated charge of the recovered container (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010248225.4A CN111397258B (en) | 2020-04-01 | 2020-04-01 | Refrigerant recovery system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010248225.4A CN111397258B (en) | 2020-04-01 | 2020-04-01 | Refrigerant recovery system and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111397258A true CN111397258A (en) | 2020-07-10 |
| CN111397258B CN111397258B (en) | 2021-08-20 |
Family
ID=71434947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010248225.4A Active CN111397258B (en) | 2020-04-01 | 2020-04-01 | Refrigerant recovery system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111397258B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183952A (en) * | 2021-12-21 | 2022-03-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114198954A (en) * | 2021-12-21 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114234501A (en) * | 2021-12-21 | 2022-03-25 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery method, control device and refrigerant recovery device |
| CN114353401A (en) * | 2021-12-21 | 2022-04-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
| WO2024004229A1 (en) * | 2022-06-30 | 2024-01-04 | 三菱電機株式会社 | Refrigerant recovery operation switching device, and refrigerant recovery device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428583A (en) * | 1996-10-25 | 2003-07-09 | 三菱重工业株式会社 | Compressor for refrigerator |
| JP2010078194A (en) * | 2008-09-25 | 2010-04-08 | Saiku Netsugaku:Kk | Method and device for cleaning refrigerant pipe |
| CN101939600A (en) * | 2008-02-13 | 2011-01-05 | 流动科技株式会社 | Nitrogen gas filling type expansion and pressurization device |
| CN105910318A (en) * | 2016-04-19 | 2016-08-31 | 上海理工大学 | Compression condensation system with ejector |
| CN207422736U (en) * | 2017-11-06 | 2018-05-29 | 三菱重工金羚空调器有限公司 | A kind of refrigerant recovery device |
| CN208458330U (en) * | 2018-07-12 | 2019-02-01 | 中国水利水电第八工程局有限公司 | Refrigeration equipment maintenance automatic-discharging freon device |
-
2020
- 2020-04-01 CN CN202010248225.4A patent/CN111397258B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428583A (en) * | 1996-10-25 | 2003-07-09 | 三菱重工业株式会社 | Compressor for refrigerator |
| CN101939600A (en) * | 2008-02-13 | 2011-01-05 | 流动科技株式会社 | Nitrogen gas filling type expansion and pressurization device |
| JP2010078194A (en) * | 2008-09-25 | 2010-04-08 | Saiku Netsugaku:Kk | Method and device for cleaning refrigerant pipe |
| CN105910318A (en) * | 2016-04-19 | 2016-08-31 | 上海理工大学 | Compression condensation system with ejector |
| CN207422736U (en) * | 2017-11-06 | 2018-05-29 | 三菱重工金羚空调器有限公司 | A kind of refrigerant recovery device |
| CN208458330U (en) * | 2018-07-12 | 2019-02-01 | 中国水利水电第八工程局有限公司 | Refrigeration equipment maintenance automatic-discharging freon device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183952A (en) * | 2021-12-21 | 2022-03-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114198954A (en) * | 2021-12-21 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114234501A (en) * | 2021-12-21 | 2022-03-25 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery method, control device and refrigerant recovery device |
| CN114353401A (en) * | 2021-12-21 | 2022-04-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
| CN114234501B (en) * | 2021-12-21 | 2023-09-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery method, control device and refrigerant recovery device |
| CN114183952B (en) * | 2021-12-21 | 2023-09-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and refrigerant recovery unit |
| CN114198954B (en) * | 2021-12-21 | 2023-09-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114353401B (en) * | 2021-12-21 | 2023-09-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
| WO2024004229A1 (en) * | 2022-06-30 | 2024-01-04 | 三菱電機株式会社 | Refrigerant recovery operation switching device, and refrigerant recovery device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111397258B (en) | 2021-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111397258B (en) | Refrigerant recovery system and control method | |
| CN111397082B (en) | Refrigerant recovery system and control method | |
| CN109980251B (en) | Fuel cell automobile air supply system based on organic Rankine cycle and control method thereof | |
| CN110425176B (en) | Gas bearing supported centrifugal compressor gas supply system | |
| CN101542185A (en) | Hydrogen filling method and station | |
| EP3712540A1 (en) | Gas heat pump system | |
| CN101078582A (en) | High efficiency heat pump air conditioner of river, lake and sea water source | |
| CN103411353A (en) | Air-source low-temperature twin-stage compression heat pump air conditioner | |
| CN101625171A (en) | High pressure level gas supplementing quasi-tertiary vapor compression type refrigerating system | |
| CN111174453A (en) | Refrigeration system | |
| CN200982767Y (en) | Jet expansion two-section evaporation steam jet type refrigeration device | |
| JP2838917B2 (en) | Refrigeration cycle | |
| CN215062958U (en) | High-efficiency direct-current frequency-conversion cascade hot water unit | |
| CN203464542U (en) | Air source low-temperature two-stage compression heat pump air conditioner | |
| CN116435546A (en) | Fuel cell air supply system based on compression and expansion integrated machine and control method | |
| CN109341132B (en) | Heat pump system and control method thereof | |
| CN202133171U (en) | Refrigeration system capable of operating on zero superheat degree on an evaporator outlet | |
| CN209067427U (en) | A kind of natural gas compressor | |
| CN221412654U (en) | Pressure stabilizing condensation membrane separation type oil gas recovery equipment | |
| CN220404830U (en) | Pressurized solvent recovery device | |
| CN116190712A (en) | High-pressure air delivery system for fuel cell in low-pressure environment | |
| CN221279718U (en) | Refrigerant recovery and filling device | |
| CN112556256A (en) | Non-condensable gas separation system and method based on ammonia system | |
| CN212457483U (en) | Oil return device of screw type refrigeration compressor oil separator | |
| CN216861830U (en) | Pure electric refrigerating unit of dining car and dining car |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |