CN113494824A - Refrigerating system, condensing unit and control method - Google Patents
Refrigerating system, condensing unit and control method Download PDFInfo
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- CN113494824A CN113494824A CN202110800036.8A CN202110800036A CN113494824A CN 113494824 A CN113494824 A CN 113494824A CN 202110800036 A CN202110800036 A CN 202110800036A CN 113494824 A CN113494824 A CN 113494824A
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- pressure
- throttle valve
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005057 refrigeration Methods 0.000 claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims description 69
- 230000008020 evaporation Effects 0.000 claims description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 6
- 239000013589 supplement Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 description 10
- 238000007710 freezing Methods 0.000 description 10
- 230000005494 condensation Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- 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
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/067—Evaporator fan units
Abstract
The invention provides a refrigerating system, a condensing unit and a control method, relates to the technical field of refrigerating equipment, and solves the technical problems of cold quantity waste and low refrigerant utilization rate. The refrigeration system comprises a high-pressure circulation flow path and a medium-pressure circulation flow path, wherein an enthalpy injection compressor, a first heat exchanger, a first throttling valve, a second heat exchanger and a gas-liquid separator are sequentially arranged on the high-pressure circulation flow path; one end of the medium-pressure circulating flow path is connected to a high-pressure circulating flow path on the outlet side of the first heat exchanger, and the other end of the medium-pressure circulating flow path is connected to an enthalpy injection port of the enthalpy injection compressor; and the medium-pressure circulating flow path is also provided with a second throttling valve and a first air cooler heat exchanger arranged in a cold quantity demand room. According to the refrigeration system, the first air cooler heat exchanger is arranged in the medium-pressure refrigerant flow path for medium-pressure air supplement, and is arranged in the refrigerated room, so that the cold energy lost in the heat exchange process can be utilized, the load of the compressor is reduced, the energy is saved, and the refrigeration system has the refrigeration and cold storage functions.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system, a condensing unit and a control method.
Background
In the field of freezing and refrigeration, the pressure difference of the used equipment is larger than that of a common air conditioner, and the maximum requirement is to reach an evaporation temperature of-30 ℃ or even lower under the condition of the outer ring temperature of 45 ℃ or above. In order to make the compressor meet such a large pressure difference, a compressor with enthalpy injection is generally used, an enthalpy injection port is added at the middle pressure of the compressor, the refrigerant on the high pressure side is throttled and then subjected to plate heat exchange, and then the refrigerant is injected into the compressor again from the enthalpy injection port, so that the overall pressure difference and the exhaust temperature of the compressor are reduced.
The applicant has found that the prior art has at least the following technical problems:
in the existing compressor with the enthalpy injection, a part of refrigerant is injected into the compressor from the enthalpy injection port to reduce the exhaust temperature, and the cold quantity of the part of refrigerant is directly released into the air to cause cold quantity waste, so that the load of the compressor is large; in the prior art, the refrigerant at the condensation outlet is a vapor-liquid two-phase flow because of insufficient condensation of the compressor, so that the utilization rate of the refrigerant is reduced, and the conditions of severe fluctuation and unstable working condition caused by misjudgment of the suction superheat degree of the electronic expansion valve are often caused.
Disclosure of Invention
The invention aims to provide a refrigerating system, a condensing unit and a control method, and aims to solve the technical problems of cold quantity waste and low refrigerant utilization rate in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a refrigeration system which comprises a high-pressure circulation flow path and a medium-pressure circulation flow path, wherein an enthalpy injection compressor, a first heat exchanger, a first throttle valve, a second heat exchanger and a gas-liquid separator are sequentially arranged on the high-pressure circulation flow path; one end of the medium-pressure circulating flow path is connected to the high-pressure circulating flow path on the outlet side of the first heat exchanger, and the other end of the medium-pressure circulating flow path is connected to an enthalpy injection port of the enthalpy injection compressor; and the medium-pressure circulating flow path is also provided with a second throttling valve and a first air cooler heat exchanger arranged in a cold quantity demand room.
As a further development of the invention, a third heat exchanger is also included, which is arranged between the first throttle valve and the first heat exchanger.
As a further improvement of the invention, the heat exchanger further comprises a liquid storage tank, wherein the liquid storage tank is provided with a high-pressure inlet, a high-pressure outlet and a medium-pressure outlet, the high-pressure circulation flow path at the outlet side of the first heat exchanger is connected to the high-pressure inlet, the high-pressure circulation flow path at the inlet side of the third heat exchanger is connected to the high-pressure outlet, and the medium-pressure circulation flow path at the inlet side of the second throttle valve is connected to the medium-pressure outlet.
As a further improvement of the invention, the high-pressure inlet and the high-pressure outlet are positioned at the upper part or the top part of the liquid storage tank, and the medium-pressure outlet is positioned at the middle part, the lower part or the bottom part of the liquid storage tank.
As a further improvement of the invention, the first heat exchanger is a water-cooling type double-pipe heat exchanger or a first air-cooled condenser, and when the first heat exchanger is the double-pipe heat exchanger, a flow pump, a water inlet temperature sensing bulb and a water outlet temperature sensing bulb are arranged on an inlet and outlet pipeline at the cold water side of the first heat exchanger.
As a further improvement of the present invention, the number of the first air-cooled condensers is multiple, all the first air-cooled condensers are arranged in parallel, and an inlet side of each first air-cooled condenser is provided with a switch valve.
As a further development of the invention, the second heat exchanger is a second air-cooler heat exchanger arranged in the cold demand room.
As a further improvement of the present invention, the first air-cooler heat exchanger and the second air-cooler heat exchanger are arranged in different rooms, one is a freezing room and the other is a refrigerating room.
As a further improvement of the present invention, the third heat exchanger is a second air-cooled condenser.
As a further improvement of the invention, an exhaust temperature sensing bulb and a high-pressure sensor are arranged on the outlet side of the enthalpy injection compressor, and an air suction temperature sensing bulb and a low-pressure sensor are arranged on the inlet side of the enthalpy injection compressor; and a pressure sensor is arranged on the enthalpy spraying port.
As a further improvement of the present invention, when the evaporation temperature of the first air cooler heat exchanger is higher than the target storage temperature, the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the inlet water temperature of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the fan frequency of the first heat exchanger; or the opening degree of the second throttling valve and/or the number of the first heat exchangers participating in heat exchange are/is adjusted; when the evaporation temperature of the second heat exchanger is higher than the target reservoir temperature, the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the fan frequency of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the number of the first heat exchangers participating in heat exchange; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the fan frequency of the third heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inlet water temperature of the first heat exchanger; when the evaporation temperature of the first air cooler heat exchanger is reduced or the evaporation temperature of the second heat exchanger is reduced, the adjustment mode of the first heat exchanger is opposite.
The invention provides a condensing unit which comprises the refrigerating system.
The invention provides a control method applied to a refrigerating system, which comprises the following steps:
As a further improvement of the invention, when a third heat exchanger is further arranged between the first throttling valve and the first heat exchanger in the refrigeration system, when the refrigeration temperature is insufficient, the method also comprises the step of controlling the third heat exchanger to reduce the evaporation temperature.
As a further improvement of the present invention, in step 200, when the refrigerating temperature of the refrigerating room is insufficient and the evaporating temperature of the second heat exchanger is greater than the target storage temperature, the evaporating temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the fan frequency of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the number of the first heat exchangers participating in heat exchange; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the fan frequency of the third heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening degree of the first throttle valve and/or the water inlet temperature of the first heat exchanger.
As a further improvement of the present invention, in step 200, when the refrigerating temperature of the refrigerating room is insufficient and the evaporation temperature of the first air cooler heat exchanger is greater than the target storage temperature, the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the water inlet temperature of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the fan frequency of the first heat exchanger; or by adjusting the opening of the second throttle valve and/or the number of the first heat exchangers participating in heat exchange.
As a further improvement of the invention, when the refrigerating temperature of the refrigerating room is insufficient, the regulation mode of the first heat exchanger is opposite to that when the refrigerating temperature of the freezing room is insufficient.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a novel refrigerating system which is used for a machine and has two functions of refrigeration and cold storage, wherein the refrigerating system is provided based on an air-supplementing and enthalpy-increasing compressor refrigerating technology, the refrigerating system has the advantages that a first air cooler heat exchanger is arranged in a medium-pressure refrigerant flow path for medium-pressure air supplement, the first air cooler heat exchanger is arranged in a refrigerating room, the refrigerating capacity lost in the heat exchange process can be utilized, and finally gas with higher pressure at a refrigerating outlet can be supplemented into a compressor through an enthalpy spraying port, so that the load of the compressor is reduced, and the energy-saving effect is achieved; the water-cooling type double-pipe heat exchanger is arranged on the high-pressure outlet side of the compressor, so that not only can the water temperature be controlled, but also the water flow can be controlled, the control modes are various, and the adjustment flexibility of the equipment is improved; the air-cooled condensers which are arranged in parallel are arranged on the high-pressure outlet side of the compressor, so that the rotating speed of a fan can be adjusted, the proportion of refrigeration input can be adjusted as required, the control modes are various, and the adjustment flexibility of equipment is improved; through set up second air-cooled condenser at second air-cooler heat exchanger front end for the refrigerant of condensation export is the liquid phase, improves the refrigerant utilization ratio, avoids the choke valve erroneous judgement and the equipment that leads to fluctuate acutely, the unstable problem of operating mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a logical wiring diagram of the refrigeration system of the present invention;
fig. 2 is a flow chart of a method of controlling the refrigerant system of the present invention.
In the figure 1, an enthalpy injection compressor; 2. a first heat exchanger; 3. a first throttle valve; 4. a second heat exchanger; 5. a gas-liquid separator; 6. a second throttle valve; 7. a first air cooler heat exchanger; 8. a third heat exchanger; 9. a liquid storage tank; 10. a flow pump; 11. a water inlet temperature sensing bulb; 12. a water outlet temperature sensing bulb; 13. an exhaust temperature sensing bulb; 14. a high pressure sensor; 15. a gas-suction temperature sensing bulb; 16. a low pressure sensor; 17. a pressure sensor; 100. a high-pressure circulation flow path; 200. a medium pressure circulation flow path.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a refrigerating system which comprises a high-pressure circulating flow path 100 and a medium-pressure circulating flow path 200, wherein an enthalpy injection compressor 1, a first heat exchanger 2, a first throttling valve 3, a second heat exchanger 4 and a gas-liquid separator 5 are sequentially arranged on the high-pressure circulating flow path 100; one end of the medium-pressure circulation flow path 200 is connected to the high-pressure circulation flow path 100 on the outlet side of the first heat exchanger 2, and the other end is connected to an enthalpy injection port of the enthalpy injection compressor 1; the medium-pressure circulation flow path 200 is also provided with a second throttle valve 6 and a first air-cooler heat exchanger 7 arranged in the cooling demand room.
The invention provides a novel refrigerating system which is used for a machine and has two functions of refrigeration and cold storage, wherein the refrigerating system is provided based on the air-supplementing and enthalpy-increasing compressor refrigerating technology, the refrigerating system has the advantages that the refrigerating capacity is utilized more fully and more energy-saving, the first air cooler heat exchanger is arranged in a medium-pressure refrigerant flow path for medium-pressure air supplement, the first air cooler heat exchanger is arranged in a refrigerating room, the refrigerating capacity lost in the heat exchange process can be utilized, and finally gas with higher pressure at a refrigerating outlet can be supplemented into a compressor through an enthalpy spraying port, so that the load of the compressor is reduced, and the energy-saving effect is achieved.
As an alternative embodiment of the present invention, a third heat exchanger 8 is further included, which is provided on the high-pressure circulation flow path 100 between the first throttle valve 3 and the first heat exchanger 2 and downstream of the connection point of the intermediate-pressure circulation flow path 200.
Further, the device also comprises a liquid storage tank 9 which can play a role in stabilizing pressure and buffering and a shunting role, wherein a high-pressure inlet, a high-pressure outlet and a medium-pressure outlet are arranged on the liquid storage tank 9, a high-pressure circulation flow path 100 at the outlet side of the first heat exchanger 2 is connected to the high-pressure inlet, a high-pressure circulation flow path 100 at the inlet side of the third heat exchanger 8 is connected to the high-pressure outlet, and a medium-pressure circulation flow path 200 at the inlet side of the second throttle valve 6 is connected to the medium-pressure outlet.
Further, the high pressure inlet and the high pressure outlet are located at the upper part or the top part of the liquid storage tank 9, and the medium pressure outlet is located at the middle part, the lower part or the bottom part of the liquid storage tank 9.
As an optional embodiment of the present invention, the first heat exchanger 2 is a water-cooling double-pipe heat exchanger or a first air-cooled condenser, and when the first heat exchanger 2 is a double-pipe heat exchanger, a flow pump 10, an inlet water temperature sensing bulb 11 and an outlet water temperature sensing bulb 12 are disposed on an inlet and outlet pipeline on a cold water side of the first heat exchanger. It should be noted that the inlet bulb 11 and the outlet bulb 12 can be implemented by using a product in the prior art, such as a temperature sensor.
Specifically, when the first heat exchanger 2 is the first air-cooled condenser, the number of the first air-cooled condensers is multiple in consideration of the flexibility and the activity of adjustment, all the first air-cooled condensers are arranged in parallel, the inlet side of each first air-cooled condenser is provided with a switch valve, and each first air-cooled condenser is of a fan frequency adjustable structure. Through this kind of structure setting, can adjust the fan piece frequency of first air-cooled condenser, adjust the cooling amount of wind of condenser, also can further adjust the condensation effect through the condenser quantity of adjusting participation in the heat transfer.
As an alternative embodiment of the invention, the second heat exchanger 4 is a second air-cooler heat exchanger arranged in the cold demand room.
Specifically, the first air-cooler heat exchanger 7 and the second air-cooler heat exchanger are arranged in different rooms, one is a freezing room, and the other is a refrigerating room.
Further, the third heat exchanger 8 is a second air-cooled condenser.
As an alternative embodiment of the present invention, the outlet side of the enthalpy-injection compressor 1 is provided with an exhaust gas temperature sensing bulb 13 and a high pressure sensor 14, and the inlet side is provided with an intake gas temperature sensing bulb 15 and a low pressure sensor 16; the enthalpy spraying port is provided with a pressure sensor 17.
When the evaporation temperature of the first air cooler heat exchanger 7 is higher than the target temperature ((t 2-delta t4) DEG C, the value t2 and the value delta t4 are both settable values which can be set by a user, wherein the value t2 can be set according to the using conditions of terminal equipment and a refrigerator matched with a unit and is used for judging that the heat exchange capacity is insufficient when the difference value of the evaporation temperature and the target temperature exceeds the value, so that the subsequent compensation control is started, and the value delta t4 is accuracy), the evaporation temperature is reduced by adjusting the opening degree of the second throttle valve 6 and/or the water inlet flow of the double-pipe heat exchanger, or, the evaporation temperature is reduced by adjusting the opening degree of the second throttle valve 6 and/or the inlet water temperature of the double-pipe heat exchanger, or, the evaporation temperature is reduced by adjusting the opening degree of the second throttle valve 6 and/or the fan frequency of the first air-cooled condenser, or the evaporation temperature is reduced by adjusting the opening degree of the second throttle valve 6 and/or the number of the first air-cooled condensers participating in heat exchange; when the evaporation temperature of the second air cooler heat exchanger, namely the second heat exchanger, is higher than the target temperature of the refrigerator ((t 1-delta t3) DEG C, the value t1 and the value delta t3 are both settable values, and a user can set the values by himself, wherein the value t1 can be set according to the use conditions of the tail end equipment and the refrigerator matched with the unit and is used for judging that the heat exchange capacity is insufficient when the difference value of the evaporation temperature and the target temperature of the refrigerator exceeds the value, so that the subsequent compensation control is started, and delta t3 is accuracy), the evaporation temperature is reduced by adjusting the opening degree of the first throttle valve 3, the fan frequency of the second air-cooled condenser and/or the water inlet flow of the double-pipe heat exchanger; or the evaporation temperature is reduced by adjusting the opening of the first throttle valve 3, the fan frequency of the second air-cooled condenser and/or the water inlet temperature of the double-pipe heat exchanger, or the evaporation temperature is reduced by adjusting the opening of the first throttle valve 3, the fan frequency of the second air-cooled condenser and/or the fan frequency of the first air-cooled condenser; or the evaporation temperature is reduced by adjusting the opening of the first throttle valve 3, the fan frequency of the second air-cooled condenser and/or the number of the first air-cooled condensers participating in heat exchange; when the evaporation temperature of the first air cooler heat exchanger 7 is reduced or the evaporation temperature of the second air cooler heat exchanger is reduced, the adjusting modes of the sleeve heat exchangers are opposite.
The water-cooling type double-pipe heat exchanger is arranged on the high-pressure outlet side of the compressor, so that not only can the water temperature be controlled, but also the water flow can be controlled, the control modes are various, and the adjustment flexibility of the equipment is improved; the air-cooled condensers which are arranged in parallel are arranged on the high-pressure outlet side of the compressor, so that the rotating speed of a fan can be adjusted, the proportion of refrigeration input can be adjusted as required, the control modes are various, and the adjustment flexibility of equipment is improved; through set up second air-cooled condenser at second air-cooler heat exchanger front end for the refrigerant of condensation export is the liquid phase, improves the refrigerant utilization ratio, avoids the choke valve erroneous judgement and the equipment that leads to fluctuate acutely, the unstable problem of operating mode.
The invention also provides a condensing unit which comprises the refrigerating system.
As shown in fig. 2, the present invention further provides a control method applied to the refrigeration system, where the refrigeration system includes an enthalpy injection compressor 1, a water-cooling type double-pipe heat exchanger or a first air-cooled condenser, a second air-cooled condenser, a first throttle valve 3 and a second air-cooler heat exchanger, which are connected in sequence by a high-pressure circulation flow path 100, and a second throttle valve 6 and a first air-cooler heat exchanger 7, which are connected by a medium-pressure circulation flow path 200, and the control method specifically includes the following steps:
When a third heat exchanger is arranged between the first throttling valve and the first heat exchanger in the refrigeration system, when the refrigeration temperature is insufficient, the method also comprises the step of reducing the evaporation temperature by controlling the third heat exchanger.
When the temperature of the refrigerating room is insufficient, the regulation mode of the first heat exchanger is opposite to that of the freezing room.
In step 200, when the refrigerating temperature of the refrigerating room is insufficient, namely when the evaporation temperature of the second heat exchanger is greater than the target storage temperature ((t 1-delta t3) DEG C), the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the fan frequency of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the number of the first heat exchangers participating in heat exchange; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the fan frequency of the third heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inlet water temperature of the first heat exchanger; specifically, when the opening degree of a first throttle valve of a freezing pipe section, namely the high-pressure refrigerant flow path 100 is opened to the minimum opening degree allowed by a system, the fan frequency of a second air-cooled condenser, namely a third heat exchanger is gradually increased at the moment, so that the freezing side evaporation temperature reaches the requirement, (t 1-delta t3) ° c < the freezing side evaporation temperature < (t 1-delta t3) ° c; if the frequency of the fan is increased to the maximum allowable frequency of the system and the evaporation temperature of the unit is not yet enabled to meet the requirement, the water flow of the water-cooling sleeve heat exchanger is reduced or the inlet water temperature is increased, and the performance requirement of the refrigeration evaporator is met by combining the secondary condensation of the second air-cooling condenser; or the evaporation temperature is reduced by controlling the opening degree of the first throttle valve, the fan frequency of the second air-cooled condenser and/or the fan frequency of the first air-cooled condenser or the number of the first air-cooled condensers participating in heat exchange.
In step 200, when the temperature of the refrigerating room is insufficient, namely when the evaporation temperature of the first air cooler heat exchanger is greater than the target storage temperature ((t 2-delta t4) DEG C), the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the water inlet temperature of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the fan frequency of the first heat exchanger; or the opening degree of the second throttling valve and/or the number of the first heat exchangers participating in heat exchange are/is adjusted; when the opening degree of the second throttle valve of the refrigeration pipe section, namely the medium-pressure refrigerant flow path 200, is opened to the minimum opening degree allowed by the system, the water flow of the water-cooling double-pipe heat exchanger is increased or the water inlet temperature is reduced at the moment, so that the performance requirement of the refrigeration evaporator, namely the first water chiller heat exchanger ((t 2-delta t4) DEG C < the evaporation temperature at the refrigeration side < (t2 +. delta t4) DEG C is met or the evaporation temperature is reduced by controlling the opening degree of the second throttle valve and/or the fan frequency of the first air-cooled condenser or the number of the first air-cooled condensers participating in heat exchange.
Wherein t1 is the target temperature of the freezing room, t2 is the target temperature of the refrigerating room, and Δ t3 is the precision value of the target temperature of the freezing room. Δ t3 is the precision value of the target temperature in the refrigerated room.
The working principle of the refrigerating system is as follows:
after the compressor compresses low-pressure gas into high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed by the water-cooling double-pipe heat exchanger, and a condensed gas-liquid two-phase flow refrigerant is separated by the liquid storage tank and is divided into two paths: 1) the saturated gas enters the second air-cooled condenser again for further condensation, finally, the low-temperature and low-pressure refrigerant is obtained through throttling by the first throttling valve, the low-temperature and low-pressure refrigerant enters the refrigeration evaporator, namely the second air-cooler heat exchanger to release cold energy, and finally, the low-pressure refrigerant coming out of the second air-cooler heat exchanger enters the air suction port of the compressor; 2) the completely condensed liquid refrigerant is throttled by a second throttle valve and enters a refrigeration evaporator, namely a first air cooler heat exchanger to release cold energy; and finally, the high-pressure refrigerant (with higher pressure compared with the low-pressure refrigerant) coming out of the first air cooler heat exchanger enters an enthalpy spraying port of the compressor, and then the next cycle is executed.
It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in fig. 1 to facilitate the description of the invention and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as 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. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (16)
1. The refrigeration system is characterized by comprising a high-pressure circulation flow path and a medium-pressure circulation flow path, wherein an enthalpy injection compressor, a first heat exchanger, a first throttle valve, a second heat exchanger and a gas-liquid separator are sequentially arranged on the high-pressure circulation flow path; one end of the medium-pressure circulating flow path is connected to the high-pressure circulating flow path on the outlet side of the first heat exchanger, and the other end of the medium-pressure circulating flow path is connected to an enthalpy injection port of the enthalpy injection compressor; and the medium-pressure circulating flow path is also provided with a second throttling valve and a first air cooler heat exchanger arranged in a cold quantity demand room.
2. The refrigerant system as set forth in claim 1, further including a third heat exchanger disposed between said first throttling valve and said first heat exchanger.
3. The refrigerant system as set forth in claim 2, further comprising a liquid reservoir having a high pressure inlet, a high pressure outlet and an intermediate pressure outlet, said high pressure circulation flow path at the outlet side of said first heat exchanger being connected to said high pressure inlet, said high pressure circulation flow path at the inlet side of said third heat exchanger being connected to said high pressure outlet, said intermediate pressure circulation flow path at the inlet side of said second throttle valve being connected to said intermediate pressure outlet.
4. The refrigerant system as set forth in claim 3, wherein said high pressure inlet and said high pressure outlet are located at an upper portion or top portion of said liquid storage tank, and said medium pressure outlet is located at a middle portion, lower portion or bottom portion of said liquid storage tank.
5. The refrigeration system according to claim 1, wherein the first heat exchanger is a water-cooled double-pipe heat exchanger or a first air-cooled condenser, and when the first heat exchanger is a double-pipe heat exchanger, a flow pump, an inlet water temperature sensing bulb and an outlet water temperature sensing bulb are arranged on an inlet and outlet pipeline on a cold water side of the first heat exchanger.
6. The refrigeration system according to claim 5, wherein the number of the first air-cooled condensers is plural, all of the first air-cooled condensers are arranged in parallel, and an inlet side of each of the first air-cooled condensers is provided with a switching valve.
7. A refrigeration system according to any one of claims 1-6, characterized in that the second heat exchanger is a second cold air cooler heat exchanger arranged in a cold demand room.
8. The refrigeration system of claim 7 wherein said first air-cooler heat exchanger and said second air-cooler heat exchanger are arranged in different rooms, one being a refrigerated room and one being a refrigerated room.
9. The refrigerant system as set forth in claim 2, wherein said third heat exchanger is a second air-cooled condenser.
10. The refrigeration system of claim 1, wherein an outlet side of the enthalpy injection compressor is provided with an exhaust bulb and a high pressure sensor, and an inlet side is provided with a suction bulb and a low pressure sensor; and a pressure sensor is arranged on the enthalpy spraying port.
11. A condensing unit comprising a refrigeration system according to any one of claims 1 to 10.
12. A control method applied to a refrigeration system as set forth in any one of claims 1 to 10, characterized by comprising the steps of:
step 100, setting a target warehouse temperature, and starting a refrigeration system for conventional refrigeration;
step 200, temperature adjustment: when the refrigeration temperature is insufficient, the evaporation temperature is reduced by controlling the first throttling valve, the second throttling valve and/or the first heat exchanger.
13. The control method as set forth in claim 12, wherein when a third heat exchanger is further provided in the refrigeration system between the first throttle valve and the first heat exchanger, when the cooling temperature is insufficient, further comprising reducing the evaporating temperature by controlling the third heat exchanger.
14. The control method according to claim 13, wherein in step 200, when the refrigerating temperature of the refrigerating room is insufficient and the evaporating temperature of the second heat exchanger is greater than the target temperature, the evaporating temperature of the second heat exchanger is reduced by adjusting the opening degree of the first throttle valve, the fan frequency of the third heat exchanger and/or the fan frequency of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve, the fan frequency of the third heat exchanger and/or the number of the first heat exchangers participating in heat exchange; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the fan frequency of the third heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening of the first throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the second heat exchanger is reduced by adjusting the opening degree of the first throttle valve and/or the water inlet temperature of the first heat exchanger.
15. The control method according to claim 14, wherein in step 200, when the refrigerating temperature of the refrigerating room is insufficient and the evaporating temperature of the first air cooler heat exchanger is greater than the target storage temperature, the evaporating temperature of the first air cooler heat exchanger is reduced by adjusting the opening degree of the second throttle valve and/or the water inlet temperature of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the inflow of water of the first heat exchanger; or the evaporation temperature of the first air cooler heat exchanger is reduced by adjusting the opening of the second throttle valve and/or the fan frequency of the first heat exchanger; or by adjusting the opening of the second throttle valve and/or the number of the first heat exchangers participating in heat exchange.
16. The control method of claim 15, wherein the first heat exchanger is adjusted in a manner opposite to the manner in which the first heat exchanger is adjusted when the refrigerating room is insufficiently cooled.
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