CN117968329A - Cold and hot water circulation control system - Google Patents
Cold and hot water circulation control system Download PDFInfo
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- CN117968329A CN117968329A CN202410277350.6A CN202410277350A CN117968329A CN 117968329 A CN117968329 A CN 117968329A CN 202410277350 A CN202410277350 A CN 202410277350A CN 117968329 A CN117968329 A CN 117968329A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 269
- 239000003507 refrigerant Substances 0.000 claims abstract description 155
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 239000000498 cooling water Substances 0.000 claims abstract description 27
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 230000007613 environmental effect Effects 0.000 claims description 31
- 238000005485 electric heating Methods 0.000 claims description 23
- 239000008236 heating water Substances 0.000 claims description 20
- 238000005057 refrigeration Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000035939 shock Effects 0.000 claims description 7
- 230000001012 protector Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012084 conversion product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- F25D31/00—Other cooling or freezing apparatus
- F25D31/005—Combined cooling and heating devices
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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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
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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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The cold and hot water circulation control system comprises a controller, a compressor and a cold water pump are started when a refrigerating instruction is received, a first electromagnetic valve, an electronic expansion valve and a third electromagnetic valve are opened, a gaseous refrigerant is compressed into high pressure from low pressure by the compressor, heat is generated by compressed refrigerant gas to form high-temperature and high-pressure refrigerant gas, the high-temperature and high-pressure refrigerant gas flows into a condenser through a first gaseous refrigerant outflow pipeline, cooling water entering through a cooling water inlet pipe in the condenser cools the high-temperature and high-pressure refrigerant gas to be changed into a liquid state, the condensed liquid refrigerant flows into a plate heat exchanger through a refrigerant flow pipeline, heat exchange is carried out between the refrigerant and cold water in the plate heat exchanger to refrigerate the cold water, the refrigerate cold water flows back into the compressor through a refrigerant return pipeline, and the refrigerate cold water in the ring control machine flows back into the plate heat exchanger through a cold water return pipeline under the extraction effect of the cold water pump.
Description
Technical Field
The invention relates to the technical field of hot water circulation control, in particular to a cold and hot water circulation control system.
Background
In order to provide cold water and hot water with proper temperatures for a ring control machine in the patent application number 2023117477553 and the patent name of a pressurized living cabin external circulation ring control system, the invention designs a cold and hot water circulation control system. In the prior art, although a cold and hot water circulation control technology exists, in the prior art, a compressor is started when refrigeration is needed, the compressor is stopped when refrigeration is not needed, and the compressor is required to be started and stopped frequently, so that the key technical difficulty in the prior research and development is how to reduce the fluctuation of the temperature and the fluctuation of the liquid supply temperature of the refrigerant at the outlet of the heat exchanger under the condition that the compressor is not stopped.
Disclosure of Invention
The invention provides a cold and hot water circulation control system aiming at the problems and the defects existing in the prior art.
The invention solves the technical problems by the following technical proposal:
The invention provides a cold and hot water circulation control system which is characterized by comprising a cold water annular control component, a hot water annular control component and a controller, wherein the cold water annular control component comprises a compressor, an outlet of the compressor is connected with a refrigerant inlet of a condenser through a first gaseous refrigerant outflow pipeline, a first shock absorber is arranged on the first gaseous refrigerant outflow pipeline, a refrigerant outlet of the condenser is connected with a refrigerant inlet of a plate heat exchanger through a refrigerant circulation pipeline, a water inlet of the condenser is connected with a cooling water inlet pipe and a water outlet of the condenser is connected with a cooling water outlet pipe, a liquid storage tank, a drying filter, a liquid viewing mirror, a first electromagnetic valve, an electronic expansion valve and a liquid-gas mixer are sequentially arranged on the refrigerant circulation pipeline along the circulation direction, two ends of the first electromagnetic valve and the electronic expansion valve which are connected in series are connected with a second electromagnetic valve in parallel, the refrigerant outlet of the plate heat exchanger is connected with the return port of the compressor through a refrigerant return pipeline, a temperature sensing bag, a gas-liquid separator and a second shock tube in an electronic expansion valve are sequentially arranged on the refrigerant return pipeline along the outflow direction, the outlet of the compressor is connected with a liquid-gas mixer through a second gaseous refrigerant outflow pipeline after passing through a first shock tube, an energy regulator is arranged on the second gaseous refrigerant outflow pipeline, the energy regulator is connected with the inlet end of the gas-liquid separator, the cold water outlet of the plate heat exchanger is connected with the cold water inlet of a ring control machine for controlling a pressurizing cabin through a cold water outlet pipeline, a low-temperature protector and a cold water temperature sensor are sequentially arranged on the cold water outlet pipeline along the outflow direction, the cold water return port of the plate heat exchanger is connected with the cold water return port of the ring control machine through the cold water return pipeline, a cold water storage tank, a third electromagnetic valve, a first filter and a cold water pump are sequentially arranged on the cold water return pipeline along the water return direction;
The controller is used for starting the compressor and the cold water pump when receiving a refrigeration instruction, the first electromagnetic valve, the electronic expansion valve and the third electromagnetic valve are opened, the compressor compresses gaseous refrigerant from low pressure to high pressure, the compressed refrigerant gas also generates heat to form high-temperature and high-pressure refrigerant gas to flow into the condenser through the first gaseous refrigerant outflow pipeline, cooling water entering through the cooling water inlet pipe in the condenser cools the high-temperature and high-pressure refrigerant gas to be in a liquid state, liquid refrigerant condensed by the condenser flows into the plate heat exchanger through the refrigerant flow pipeline, heat exchange is carried out between the refrigerant and cold water in the plate heat exchanger to refrigerate cold water, the refrigerant after heat exchange flows back into the compressor through the refrigerant return pipeline, and cold water after refrigeration enters the ring control machine through the cold water outlet pipeline under the extraction action of the cold water pump and flows back into the plate heat exchanger through the cold water return pipeline;
The controller is also used for adjusting the opening of the electronic expansion valve based on the temperature of the refrigerant flowing out of the heat exchanger sensed by the temperature sensing bag in the electronic expansion valve so as to adjust the flow rate of the refrigerant in the refrigerant flowing pipeline, the sensed temperature of the refrigerant is reduced, the opening of the electronic expansion valve is adjusted to be reduced along with the temperature reduction, the flow rate of the refrigerant in the refrigerant flowing pipeline is reduced along with the temperature reduction, and the opening of the electronic expansion valve reaches the set minimum opening at most;
The energy regulator is used for regulating part of high-temperature high-pressure refrigerant gas flowing out of the compressor to directly flow into the liquid-gas mixer through the second gaseous refrigerant outflow pipeline after sensing that the pressure of the refrigerant in the refrigerant return pipeline is reduced below a set pressure range, the high-temperature high-pressure refrigerant gas is mixed with the steam refrigerant flowing out of the electronic expansion valve, so that the temperature of the refrigerant entering the heat exchanger is increased, the pressure is increased, the outlet pressure of the heat exchanger is restored to be within the set pressure range, and the compressor continuously operates in an optimal state.
The hot water environmental control assembly comprises an electric heating water tank, a water outlet of the electric heating water tank is connected with a hot water inlet of the environmental control machine through a hot water outlet pipeline, an overheat protector and a hot water temperature sensor are sequentially arranged on the hot water outlet pipeline along the water outlet direction, a water return port of the electric heating water tank is connected with a hot water return port of the environmental control machine through a hot water return pipeline, a hot water liquid storage tank, a fourth electromagnetic valve, a second filter and a hot water pump are sequentially arranged on the hot water return pipeline along the water return direction, and an electric heater is arranged in the electric heating water tank;
The controller is used for starting the electric heater and the hot water pump when receiving a heating instruction, the fourth electromagnetic valve is opened, the electric heater heats water in the electric heating water tank, under the pumping action of the hot water pump, heated hot water enters the environmental control machine through the hot water outlet pipeline, and hot water in the environmental control machine flows back into the electric heating water tank through the hot water return pipeline.
The invention has the positive progress effects that:
The cold and hot water circulation control system designed by the invention provides cold water and hot water with proper temperature for the annular control machine at the tail end, has the capability of simultaneously providing cold water and hot water, and is matched with corresponding annular control equipment for use, so that the temperature and humidity in the pressurizing cabin can be controlled, and a good safe and comfortable environment is provided for staff in the pressurizing cabin. The cold water environmental control assembly realizes the temperature control of the output coolant water, the hot water environmental control assembly realizes the temperature control of the output heat medium water, and the heat medium water and the coolant water are distributed through the external environmental control machine, so that the condensing coil and the heating coil on the environmental control machine are supplied with the working medium water with certain flow.
According to the invention, through the arrangement of the electronic expansion valve and the energy regulator, fluctuation of the temperature and the pressure of the refrigerant liquid supply at the outlet of the heat exchanger can be reduced under the condition that the compressor is not stopped, so that the compressor can continuously operate in an optimal state.
Drawings
Fig. 1 is a schematic diagram of a hot and cold water circulation control system according to a preferred embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present embodiment provides a cold and hot water circulation control system, which includes a cold water environmental control component, a hot water environmental control component and a controller. The cold water environmental control component adopts a compression refrigeration technology, and the hot water environmental control component adopts an electric heating technology.
Wherein, the cold water environmental control component comprises a compressor 1, the outlet of the compressor 1 is connected with the refrigerant inlet of a condenser 3 through a first gaseous refrigerant outflow pipeline 2, a first shock absorber 4 is arranged on the first gaseous refrigerant outflow pipeline 2, the refrigerant outlet of the condenser 3 is connected with the refrigerant inlet of a plate heat exchanger 6 through a refrigerant flow pipeline 5, the water inlet of the condenser 3 is connected with a cooling water inlet pipe 7, the water outlet is connected with a cooling water outlet pipe 8, a liquid storage tank 9, a drying filter 10, a liquid viewing mirror 11, a first electromagnetic valve 12, an electronic expansion valve 13 and a liquid-gas mixer 14 are sequentially arranged on the refrigerant flow pipeline 5 along the outflow direction, the two ends of the first electromagnetic valve 12 and the electronic expansion valve 13 which are connected in series are connected with a second electromagnetic valve 15 in parallel, the refrigerant outlet of the plate heat exchanger 6 is connected with the return port of the compressor 1 through a refrigerant return pipeline 16, the cold water outlet of the plate heat exchanger 6 is connected with a cold water inlet of a ring control machine for controlling a pressurizing cabin through a cold water outlet pipeline 22, a low-temperature protector 23 and a cold water temperature sensor 24 are sequentially arranged on the cold water outlet pipeline 22 along the water outlet direction, a cold water return port of the plate heat exchanger 6 is connected with a cold water return port of the ring control machine through a cold water return pipeline 25, a cold water storage tank 26, a cold water return tank 26 are sequentially arranged on the cold water return pipeline 25 along the water return direction, A third solenoid valve 27, a first Y-filter 28 and a cold water pump 29.
When the compression chamber has a refrigeration requirement, the environmental control machine sends a refrigeration instruction, the controller starts the compressor 1 and the cold water pump 29 when receiving the refrigeration instruction, the first electromagnetic valve 12, the electronic expansion valve 13 and the third electromagnetic valve 27 are opened, the compressor 1 is the motive power of the refrigeration loop, the compressor 1 compresses gaseous refrigerant from low pressure to high pressure, the compressed refrigerant gas also generates heat to form high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas flows into the condenser 3 through the first gaseous refrigerant outflow pipeline 2, the cooling water entering through the cooling water inlet pipe 7 in the condenser 3 cools the high-temperature high-pressure refrigerant gas to change the refrigerant gas into liquid, the liquid refrigerant condensed by the condenser 3 flows into the plate heat exchanger 6 through the refrigerant flow pipeline 5, the refrigerant and cold water in the plate heat exchanger 6 are subjected to heat exchange to refrigerate, the refrigerant after heat exchange flows back into the compressor 1 through the refrigerant return pipeline 16, the cold water enters the environmental control machine through the cold water outlet pipeline 22 under the extraction effect of the cold water pump 29, and the cold water in the environmental control machine flows into the plate heat exchanger 6 through the cold water return pipeline 25. As for the working principle of the ring control machine, the working principle of the ring control machine is not necessary to be described in detail.
The controller is further configured to adjust the opening of the electronic expansion valve 13 to adjust the flow rate of the refrigerant in the refrigerant flow conduit 5 based on the temperature of the refrigerant flowing out of the plate heat exchanger 6 sensed by the bulb 131 in the electronic expansion valve 13, the sensed temperature of the refrigerant decreases, the opening of the electronic expansion valve 13 decreases accordingly, the flow rate of the refrigerant in the refrigerant flow conduit 5 decreases accordingly, and the opening of the electronic expansion valve 13 reaches at most the set minimum opening.
When the load in the refrigeration system decreases, the temperature of the refrigerant at the outlet of the plate heat exchanger 6 will decrease as the heat gain of the refrigerant at this time decreases. The refrigerant temperature decreases, resulting in a decrease in pressure (by charles law P/t=constant). Since the electronic expansion valve 13 can only be adjusted within a certain range of the load of the plate heat exchanger 6, the system is also provided with an energy regulator 21, and the energy regulator 21 can maintain the stable operation of the system when the load of the plate heat exchanger 6 changes greatly.
In the refrigerating process, the opening of the electronic expansion valve 13 is adjusted to regulate the temperature and pressure of the refrigerant at the outlet of the plate heat exchanger 6, and then the energy regulator 21 is used to regulate the temperature and pressure of the refrigerant at the outlet of the plate heat exchanger 6. The energy regulator 21 continuously senses the pressure of the refrigerant in the refrigerant return line 16 (i.e., the outlet of the plate heat exchanger 6), and after sensing that the pressure of the refrigerant in the refrigerant return line 16 falls below the set pressure range, the energy regulator 21 regulates that a part of the high-temperature and high-pressure refrigerant gas flowing out of the compressor 1 directly flows into the liquid-gas mixer 14 through the second gaseous refrigerant outflow line 20, and the high-temperature and high-pressure refrigerant gas flowing out of the second gaseous refrigerant outflow line 20 is mixed with the vapor refrigerant flowing out of the electronic expansion valve 13 in the liquid-gas mixer 14, so that the temperature of the refrigerant entering the plate heat exchanger 6 is increased, the pressure of the plate heat exchanger 6 is also increased, and the outlet pressure of the plate heat exchanger 6 is restored to be within the set pressure range, so that the compressor 1 continues to operate in an optimal state.
The end of the cold water outlet pipe 22 near the cold water inlet of the loop control machine is connected to the end of the cold water return pipe 25 near the cold water return port of the loop control machine through a cold water connecting pipe 30, and a first overflow valve 31 is provided on the cold water connecting pipe 30. When the valve at the cold water inlet in the ring control machine is closed, cold water in the cold water outlet pipeline 22 cannot flow into the ring control machine, in order to prevent the cold water from blocking the cold water outlet pipeline 22 and not flowing, a first overflow valve 31 is arranged, when the pressure difference between the pressure in the cold water outlet pipeline 22 and the pressure in the cold water return pipeline 25 is more than or equal to 6.2bar, the first overflow valve 31 is opened, the cold water in the cold water outlet pipeline 22 directly flows into the cold water return pipeline 25 through the first overflow valve 31, and at the moment, the cold water which cannot enter the ring control machine can flow into the cold water return pipeline 25 through the first overflow valve 31, so that the cold water in the cold water outlet pipeline 22 can also flow when the ring control machine is closed.
In this scheme, temperature detect switch 17 is used for when sensing the temperature and is low to set for the threshold value (indicate that need not refrigerate in the pressure cabin), output switch signal controller, the controller is used for controlling first solenoid valve 12 to close, electronic expansion valve 13 closes and does not work, energy regulator 21 adjusts the high temperature high pressure refrigerant gas that flows out from compressor 1 and directly flows into plate heat exchanger 6 through second gaseous refrigerant outflow pipeline 20 in whole, realize the refrigerant idle running, avoid the pressure cabin and need frequently pause the compressor when refrigerate, the frequent drawback of starting the compressor when pressure cabin need refrigerate frequently.
In this scheme, be provided with condensation pressure control valve 32 on the cooling water inlet pipe 7, on cooling water exit tube 8 was arranged in to the pressure sensing part 321 of condensation pressure control valve 32, the pressure sensing part 321 of condensation pressure control valve 32 was used for the pressure of the cooling water export of response condenser 3, keeps cooling water's pressure and temperature based on the flow of this pressure adjustment cooling water in the cooling water inlet pipe 7.
The hot water environmental control assembly comprises an electric heating water tank 33, a water outlet of the electric heating water tank 33 is connected with a hot water inlet of the environmental control machine through a hot water outlet pipeline 34, an overheat protector 35 and a hot water temperature sensor 36 are sequentially arranged on the hot water outlet pipeline 34 along the water outlet direction, a water return port of the electric heating water tank 33 is connected with a hot water return port of the environmental control machine through a hot water return pipeline 37, a hot water liquid storage tank 38, a fourth electromagnetic valve 39, a second Y-shaped filter 40 and a hot water pump 41 are sequentially arranged on the hot water return pipeline 37 along the water return direction, and an electric heater is arranged in the electric heating water tank 33.
When the pressurizing cabin has a heating requirement, the environmental control machine sends out a heating instruction, the controller is used for starting the electric heater and the hot water pump 41 when receiving the heating instruction, the fourth electromagnetic valve 39 is opened, the electric heater heats water in the electric heating water tank 33, under the pumping action of the hot water pump 41, heated hot water enters the environmental control machine through the hot water outlet pipeline 34, and hot water in the environmental control machine flows back into the electric heating water tank 33 through the hot water return pipeline 37.
In this scheme, the end of the hot water outlet pipe 34 close to the hot water inlet of the environmental control machine is connected to the end of the hot water return pipe 37 close to the hot water return port of the environmental control machine through a hot water connecting pipe 42, and a second overflow valve 43 is arranged on the hot water connecting pipe 42. When the valve at the hot water inlet in the environmental control machine is closed, hot water in the hot water outlet pipeline 34 cannot flow into the environmental control machine, in order to prevent the hot water from blocking the hot water outlet pipeline 34 and not flowing, a second overflow valve 43 is arranged, when the pressure difference between the pressure in the hot water outlet pipeline 34 and the pressure in the hot water return pipeline 37 is more than or equal to 5.8bar, the second overflow valve 43 is opened, the hot water in the hot water outlet pipeline 34 directly flows into the hot water return pipeline 37 through the second overflow valve 43, and at the moment, the hot water which cannot enter the environmental control machine can flow into the hot water return pipeline 37 through the second overflow valve 43, so that the hot water in the hot water outlet pipeline 34 can also flow when the environmental control machine is closed.
The cold and hot water circulation control system uses 70:30 as a heat transfer liquid. The mixed liquor can prevent the liquid from freezing due to the cold of the external environment and can also prevent the plate heat exchanger 6 from freezing. The cold and hot water circulation control system comprises two independent loops (a cold water ring control assembly and a hot water ring control assembly) and is used for heating, refrigerating and dehumidifying by generating liquid (cold water or hot water) with a certain temperature.
The medium water circuit is circulated by a motor-driven multistage vertical axial circulation pump (cold water pump 29 and hot water pump 41) with a maximum operating pressure of 4.5bar. The front panel of the system is provided with a measuring pressure gauge, so that the pressure of the medium water can be conveniently monitored. A safety valve is arranged in each loop to avoid the damage of the circulating pump and remove the gas possibly leaking into the hot water/cold water loop in the pressurizing cabin.
The system adopts the Freon in the refrigerant loop for evaporation and cooling, and realizes the refrigeration of the refrigerant water through the heat exchange of the plate heat exchanger to the refrigerant water. The refrigeration system can realize partial unloading of the system by adopting the combination of CPCE+LG (energy regulator+liquid-gas mixer), and prevent the system from obviously fluctuating and frequently starting and stopping when the water temperature is maintained.
The refrigerating load adjusting mode of the cold and hot water circulation control system adopts a fixed-frequency compressor plus CPCE+LG unloading adjusting mode, and the load adjusting mode of the variable-frequency compressor can be actually selected. The largest difference between the variable frequency and the fixed frequency of the air conditioner is the difference of the application principle of the product on the compressor. The compressor of frequency conversion product can moderately adjust temperature under the condition of long-term opening operation, if a large amount of cold and hot are not needed in the room, the air conditioner can operate in a low-frequency state, the temperature is controlled intelligently constantly, and the fixed-frequency product needs to be subjected to cold quantity adjustment through loading and unloading components. The system can be used for both, but the problem of electromagnetic interference caused by the adoption of the variable frequency compressor is considered, and the load adjusting range of the system is also large by additionally installing the combined CPCE+LG unloading valve, and the system can save electricity under partial load without hidden danger of electromagnetic interference, so that the system adopts a mode of selecting the variable frequency compressor and adding CPCE+LG unloading adjustment.
The system heats water in the electric heating water tank 33 by an electric heating mode, divides the electric heating into two groups, and adopts a mode of precisely adjusting heating power of one group of electric heaters by using a silicon controlled rectifier to control the water temperature of the electric heating water tank 33 to be constant. The hot water is then circulated by the hot water pump 41.
The condenser 3 is a heat exchanger for cooling the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 with cooling water to change the refrigerant gas into a liquid state. The liquid refrigerant flows to the accumulator 9 and remains at high pressure, but now the temperature has cooled to around 40 ℃.
The reservoir 9 is a simple reservoir of liquid coolant and is provided with a safety valve to protect the system from overpressure. After the system is charged with the proper amount of refrigerant, sufficient refrigerant is ensured for expansion by the capacity of the liquid storage tank.
The liquid flowing out of the liquid storage tank 9 will pass through the filter dryer 10, and the filter dryer 10 removes moisture in the refrigerant before the refrigerant flows to the electronic expansion valve 13, so that the moisture is prevented from entering the electronic expansion valve 13, and freezing is prevented from blocking the refrigerant flow. The oil in the compressor 1 is also hygroscopic and any moisture in the system will reduce the lubrication effect and shorten the life of the compressor.
The second electromagnetic valve 15 is arranged in the loop, after the refrigeration system is closed due to reasons, the flow of the refrigerant to the electronic expansion valve 13 is cut off, the refrigerant in the liquid storage tank 9 can enter the plate heat exchanger 6 through the second electromagnetic valve 15 to exchange heat, the refrigerant after heat exchange enters the compressor 1 again, and the high-pressure side and the condenser are ensured to have enough available refrigerant, and the refrigerant can flow through the first electromagnetic valve 12 immediately when the refrigeration system is restarted.
The liquid-viewing mirror 11 allows an operator to confirm that the refrigerant liquid is not mixed with the wet vapor before entering the electronic expansion valve 13. If moisture is entered into the system, the color of the spherical indicator in the middle of the view mirror 11 will change from green to yellow. The liquid mirror 11 can also observe the capacity of the system refrigerant.
When the pressure of the refrigerant is suddenly reduced while flowing through the electronic expansion valve 13, the liquid is rapidly expanded and converted into vapor, and thus becomes very cold. The electronic expansion valve 13 is provided with a capillary tube and a vacuum pressure tube, and can monitor the temperature and pressure of the refrigerant at the outlet of the plate heat exchanger 6. The capillary tube can sense any temperature change caused by the load change of the plate heat exchanger 6, automatically adjust the setting of the electronic expansion valve 13, maintain the load of the overheat of the plate heat exchanger 6 unchanged, and ensure that the refrigerant received by the compressor 1 is always gaseous.
The plate heat exchanger 6 extracts heat from the higher temperature chilled water circuit into low temperature refrigerant vapor, which is heated to become gaseous, which flows back to the inlet of the compressor 1 and then continues to circulate.
The refrigerant system design uses R404A refrigerant, confirming that the system is using the correct refrigerant for routine maintenance or filling.
The cold and hot water circulation control system is developed according to the technical requirements of high-pressure multi-element mixed gas control equipment. The design of the cold and hot water circulation control system products is that the project enters the construction stage at present.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (7)
1. A cold and hot water circulation control system is characterized by comprising a cold water annular control assembly, a hot water annular control assembly and a controller, wherein the cold water annular control assembly comprises a compressor, an outlet of the compressor is connected with a refrigerant inlet of a condenser through a first gaseous refrigerant outflow pipeline, a first shock absorber is arranged on the first gaseous refrigerant outflow pipeline, a refrigerant outlet of the condenser is connected with a refrigerant inlet of a plate heat exchanger through a refrigerant circulation pipeline, a water inlet of the condenser is connected with a cooling water inlet pipe, a water outlet of the condenser is connected with a cooling water outlet pipe, a liquid storage tank, a drying filter, a liquid viewing mirror, a first electromagnetic valve, an electronic expansion valve and a liquid-gas mixer are sequentially arranged on the refrigerant circulation pipeline along the circulation direction, two ends of the first electromagnetic valve and the electronic expansion valve which are connected in series are connected with a second electromagnetic valve in parallel, the refrigerant outlet of the plate heat exchanger is connected with the return port of the compressor through a refrigerant return pipeline, a temperature sensing bag, a gas-liquid separator and a second shock tube in an electronic expansion valve are sequentially arranged on the refrigerant return pipeline along the outflow direction, the outlet of the compressor is connected with a liquid-gas mixer through a second gaseous refrigerant outflow pipeline after passing through a first shock tube, an energy regulator is arranged on the second gaseous refrigerant outflow pipeline, the energy regulator is connected with the inlet end of the gas-liquid separator, the cold water outlet of the plate heat exchanger is connected with the cold water inlet of a ring control machine for controlling a pressurizing cabin through a cold water outlet pipeline, a low-temperature protector and a cold water temperature sensor are sequentially arranged on the cold water outlet pipeline along the outflow direction, the cold water return port of the plate heat exchanger is connected with the cold water return port of the ring control machine through the cold water return pipeline, a cold water storage tank, a third electromagnetic valve, a first filter and a cold water pump are sequentially arranged on the cold water return pipeline along the water return direction;
The controller is used for starting the compressor and the cold water pump when receiving a refrigeration instruction, the first electromagnetic valve, the electronic expansion valve and the third electromagnetic valve are opened, the compressor compresses gaseous refrigerant from low pressure to high pressure, the compressed refrigerant gas also generates heat to form high-temperature and high-pressure refrigerant gas to flow into the condenser through the first gaseous refrigerant outflow pipeline, cooling water entering through the cooling water inlet pipe in the condenser cools the high-temperature and high-pressure refrigerant gas to be in a liquid state, liquid refrigerant condensed by the condenser flows into the plate heat exchanger through the refrigerant flow pipeline, heat exchange is carried out between the refrigerant and cold water in the plate heat exchanger to refrigerate cold water, the refrigerant after heat exchange flows back into the compressor through the refrigerant return pipeline, and cold water after refrigeration enters the ring control machine through the cold water outlet pipeline under the extraction action of the cold water pump and flows back into the plate heat exchanger through the cold water return pipeline;
The controller is also used for adjusting the opening of the electronic expansion valve based on the temperature of the refrigerant flowing out of the heat exchanger sensed by the temperature sensing bag in the electronic expansion valve so as to adjust the flow rate of the refrigerant in the refrigerant flowing pipeline, the sensed temperature of the refrigerant is reduced, the opening of the electronic expansion valve is adjusted to be reduced along with the temperature reduction, the flow rate of the refrigerant in the refrigerant flowing pipeline is reduced along with the temperature reduction, and the opening of the electronic expansion valve reaches the set minimum opening at most;
The energy regulator is used for regulating part of high-temperature high-pressure refrigerant gas flowing out of the compressor to directly flow into the liquid-gas mixer through the second gaseous refrigerant outflow pipeline after sensing that the pressure of the refrigerant in the refrigerant return pipeline is reduced below a set pressure range, the high-temperature high-pressure refrigerant gas is mixed with the steam refrigerant flowing out of the electronic expansion valve, so that the temperature of the refrigerant entering the heat exchanger is increased, the pressure is increased, the outlet pressure of the heat exchanger is restored to be within the set pressure range, and the compressor continuously operates in an optimal state.
2. The cold and hot water circulation control system according to claim 1, wherein the hot water circulation control assembly comprises an electric heating water tank, a water outlet of the electric heating water tank is connected with a hot water inlet of the circulation control machine through a hot water outlet pipeline, an overheat protector and a hot water temperature sensor are sequentially arranged on the hot water outlet pipeline along the water outlet direction, a water return port of the electric heating water tank is connected with a hot water return port of the circulation control machine through a hot water return pipeline, a hot water storage tank, a fourth electromagnetic valve, a second filter and a hot water pump are sequentially arranged on the hot water return pipeline along the water return direction, and an electric heater is arranged in the electric heating water tank;
The controller is used for starting the electric heater and the hot water pump when receiving a heating instruction, the fourth electromagnetic valve is opened, the electric heater heats water in the electric heating water tank, under the pumping action of the hot water pump, heated hot water enters the environmental control machine through the hot water outlet pipeline, and hot water in the environmental control machine flows back into the electric heating water tank through the hot water return pipeline.
3. The chilled/heated water circulation control system of claim 2, further comprising: the end part of the hot water outlet pipeline, which is close to the hot water inlet of the ring control machine, is connected with the end part of the hot water return pipeline, which is close to the hot water return port of the ring control machine, through a hot water connecting pipe, and a second overflow valve is arranged on the hot water connecting pipe;
When the valve at the hot water inlet in the ring control machine is closed, hot water in the hot water outlet pipeline cannot flow into the ring control machine, and when the pressure difference between the pressure in the hot water outlet pipeline and the pressure in the hot water return pipeline is more than or equal to 5.8bar, the second overflow valve is opened, and hot water in the hot water outlet pipeline directly flows into the hot water return pipeline through the second overflow valve.
4. The chilled/heated water loop control system of claim 2, wherein the first filter and the second filter are both Y-type filters.
5. The chilled/heated water circulation control system of claim 1, further comprising: the end part of the cold water outlet pipeline, which is close to the cold water inlet of the ring control machine, is connected with the end part of the cold water return pipeline, which is close to the cold water return port of the ring control machine, through a cold water connecting pipe, and a first overflow valve is arranged on the cold water connecting pipe;
When a valve at a cold water inlet in the ring control machine is closed, cold water in the cold water outlet pipeline cannot flow into the ring control machine, and when the pressure difference between the pressure in the cold water outlet pipeline and the pressure in the cold water return pipeline is more than or equal to 6.2bar, the first overflow valve is opened, and cold water in the cold water outlet pipeline directly flows into the cold water return pipeline through the first overflow valve.
6. The cold and hot water circulation control system according to claim 1, wherein a temperature control switch is arranged on the refrigerant return pipe, and the temperature control switch is arranged between a temperature sensing bag in the electronic expansion valve and the gas-liquid separator;
the temperature control switch is used for outputting a switch signal controller when the temperature is sensed to be low to a set threshold value, the controller is used for controlling the first electromagnetic valve to be closed, the electronic expansion valve is closed and does not work, the energy regulator works, and the energy regulator is used for regulating the high-temperature and high-pressure refrigerant gas flowing out of the compressor to flow into the heat exchanger through the second gaseous refrigerant outflow pipeline directly.
7. The cold and hot water circulation control system according to claim 1, wherein a condensing pressure regulating valve is provided on the cooling water inlet pipe, and a pressure sensing part of the condensing pressure regulating valve is disposed on the cooling water outlet pipe;
The pressure sensing part of the condensing pressure regulating valve is used for sensing the pressure of the cooling water outlet of the condenser, and based on the pressure, the flow of the cooling water in the cooling water inlet pipe is regulated to keep the pressure and the temperature of the cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410277350.6A CN117968329A (en) | 2024-03-12 | 2024-03-12 | Cold and hot water circulation control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410277350.6A CN117968329A (en) | 2024-03-12 | 2024-03-12 | Cold and hot water circulation control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117968329A true CN117968329A (en) | 2024-05-03 |
Family
ID=90851709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410277350.6A Pending CN117968329A (en) | 2024-03-12 | 2024-03-12 | Cold and hot water circulation control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117968329A (en) |
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2024
- 2024-03-12 CN CN202410277350.6A patent/CN117968329A/en active Pending
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