CN115200242A - Constant-temperature water chilling unit - Google Patents
Constant-temperature water chilling unit Download PDFInfo
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- CN115200242A CN115200242A CN202210942504.XA CN202210942504A CN115200242A CN 115200242 A CN115200242 A CN 115200242A CN 202210942504 A CN202210942504 A CN 202210942504A CN 115200242 A CN115200242 A CN 115200242A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000003507 refrigerant Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 230000001502 supplementing effect Effects 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a constant-temperature water chilling unit, which relates to the field of water chilling units and comprises a refrigerant circulating system, a water-cooling auxiliary adjusting system, a heat supplementing branch adjusting system and a controller, wherein the water-cooling auxiliary adjusting system and the heat supplementing branch adjusting system are respectively connected with the controller, and the refrigerant circulating system comprises a compressor, an air-cooled heat exchanger, a liquid storage tank, an expansion valve and an evaporation heat exchanger which are sequentially connected end to end; the water-cooling auxiliary adjusting system comprises a water tank, a water pump, an adjusting water-cooling heat exchanger and a temperature sensor, wherein the temperature sensor is arranged at a water outlet of the water tank; the heat supplementing branch adjusting system comprises a heat supplementing electromagnetic valve, one end of the heat supplementing electromagnetic valve is connected between the compressor and the air-cooled heat exchanger, and the other end of the heat supplementing electromagnetic valve is connected to the liquid storage tank to control the internal refrigerating capacity; the controller collects the temperature value of the temperature sensor and controls the refrigerating capacity and the heat exchange capacity to enable the outlet temperature of the water tank to reach a dynamic balance state. The invention uses the unit to adjust the temperature change in the water tank, and has small power consumption and more accurate adjustment.
Description
Technical Field
The invention relates to the field of water chilling units, in particular to a constant-temperature water chilling unit.
Background
When the constant temperature water chilling unit operates, because the cooled objects are different, the constant temperature water chilling unit is influenced by the cooled objects and the change of the environmental temperature, when the refrigerating capacity is larger than the refrigerating capacity, the fluctuation of the temperature of the cooled objects is continuously low, and the like, so that the application effect of the constant temperature water chilling unit is influenced. In order to ensure the constancy of the temperature of chilled water, a single refrigeration and auxiliary electric heating mode is adopted, when the water temperature in a water tank of the constant-temperature water chilling unit is lower than the lower limit of a set value, the auxiliary electric heating is started, the auxiliary electric heating counteracts partial refrigerating capacity, the water temperature in the water tank of the constant-temperature water chilling unit is constant at the set value, one part of heat of the single electric heating is dissipated to the environment, the energy consumption is greatly increased, in addition, a common electric heater is uneven in heating, the service life of an electric heater is limited, certain potential safety hazards exist, meanwhile, the temperature of the existing equipment is controlled through a time mode, equipment is turned on and turned off repeatedly, and the service life of the compressor is influenced.
Accordingly, those skilled in the art have endeavored to develop a constant temperature water chiller.
Disclosure of Invention
In view of the above defects in the prior art, the technical problems to be solved by the invention are that the energy consumption of the existing water chilling unit is high, the heating of the heater is uneven, and the service life of the equipment is affected by the continuous opening and closing of the equipment.
In order to achieve the above purpose, the invention provides a constant temperature water chilling unit, which comprises a refrigerant circulation system, a water-cooling auxiliary adjusting system, a heat supplementing branch adjusting system and a controller, wherein the water-cooling auxiliary adjusting system and the heat supplementing branch adjusting system are respectively connected with the controller,
the refrigerant circulating system comprises a compressor, an air cooling heat exchanger, a liquid storage tank, a drying filter, an expansion valve and an evaporation heat exchanger which are sequentially connected end to end;
the water-cooling auxiliary adjusting system comprises a water tank, a water pump, an adjusting water-cooling heat exchanger, a temperature sensor, a control valve and a second one-way valve, wherein the temperature sensor is installed at a water outlet of the water tank and used for monitoring the water temperature at the water outlet of the water tank; the water in the water tank reaches the adjusting water-cooling heat exchanger after passing through the water pump, and returns to the water tank after absorbing heat, so that the heat of the water in the water tank is increased;
the heat supplementing branch adjusting system comprises a heat supplementing electromagnetic valve, one end of the heat supplementing branch adjusting system is connected between the compressor and the air-cooled heat exchanger, and the other end of the heat supplementing branch adjusting system is connected to the liquid storage tank; the heat supplementing branch adjusting system controls the opening degree of the heat supplementing electromagnetic valve through the controller to control the internal refrigerating capacity;
the controller collects the temperature value of the temperature sensor, controls the refrigerating capacity of the refrigerant circulating system and the heat exchange capacity supplemented by the water-cooling auxiliary adjusting system and the heat supplementing branch adjusting system, enables the outlet temperature of the water tank to reach a dynamic balance state, and realizes accurate control.
Furthermore, the water-cooling auxiliary adjusting system further comprises a bypass electromagnetic valve and a first one-way valve, one end of the bypass electromagnetic valve is connected with the adjusting water-cooling heat exchanger, the other end of the bypass electromagnetic valve is connected in series between the compressor and the air-cooling heat exchanger, one end of the first one-way valve is connected with the adjusting water-cooling heat exchanger, and the other end of the first one-way valve is connected in series between the air-cooling heat exchanger and the liquid storage tank.
Further, the controller performs algorithm control on the collected temperature, controls the bypass electromagnetic valve and the heat supplementing electromagnetic valve to be opened or closed according to a set temperature control threshold value, and realizes dynamic control on the outlet temperature of the water tank, wherein the specific control mode comprises the following steps:
when the temperature of the outlet of the water tank is detected to be lower than the temperature control threshold value, controlling the opening degree of the bypass electromagnetic valve to control the heat exchange amount of the water-cooling auxiliary adjusting system, and controlling the opening degree of the heat supplementing electromagnetic valve to control the heat supplementing amount, so that the refrigerating capacity is reduced from the source;
and when the temperature of the outlet of the water tank is detected to be higher than the temperature control threshold value, closing or reducing the opening degree of the bypass electromagnetic valve to reduce the heat exchange amount of the water-cooling auxiliary adjusting system and closing or reducing the opening degree of the heat supplementing electromagnetic valve to increase the refrigerating capacity.
Further, the controller performs the algorithm control on the collected temperature, including at least one of proportional, integral and derivative algorithm control on the temperature, and supports setting the temperature control threshold.
Further, the controller adopts a PID controller.
Further, the bypass electromagnetic valve is an electromagnetic valve with an adjustable opening degree.
Further, the controller in the constant-temperature water chilling unit controls the opening and closing of the water pump and the control valve, and when the bypass electromagnetic valve is opened, the water pump and the control valve are also opened simultaneously.
Further, the evaporation heat exchanger is embedded in the water tank, and the evaporation heat exchanger absorbs heat of water in the water tank when working.
Furthermore, the adjusting water-cooling heat exchanger adopts a small-sized tubular or plate heat exchanger to realize heat exchange between the refrigerant and the water channel.
Furthermore, the opening of the heat-compensating electromagnetic valve can be adjusted.
In the preferred embodiment of the invention, compared with the prior art, the invention has the following technical effects:
1. the water chilling unit adopts the air-cooled heat exchanger, adds a small adjusting waterway heat exchanger bypass, and a liquid storage tank refrigerant heat supplementing branch, and utilizes the waterway heat exchanger to accurately and reliably adjust the temperature change in the water tank;
2. the constant-temperature water chilling unit utilizes the refrigerant heat supplementing branch to increase or reduce the refrigerating capacity and balances the temperature through the balance of internal refrigeration and waterway heat exchange.
The conception, specific structure and technical effects of the present invention will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a thermostatic chiller system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the normal internal refrigeration trend of a constant temperature water chilling unit according to a preferred embodiment of the present invention;
fig. 3 is a schematic view of the constant temperature water chiller according to a preferred embodiment of the present invention, with the internal refrigeration trend of the adjusting waterway heat exchanger and the heat supplementing branch of the liquid storage tank;
FIG. 4 is a schematic diagram illustrating the adjustment of the direction of the water circuit circulation of the constant temperature water chilling unit according to a preferred embodiment of the present invention;
wherein: 1-compressor, 2-bypass electromagnetic valve, 3-adjusting water cooling heat exchanger, 4-first one-way valve, 5-air cooling heat exchanger, 6-liquid storage tank, 7-drying filter, 8-expansion valve, 9-evaporating heat exchanger, 10-temperature sensor, 11-water tank, 12-second one-way valve, 13-water pump, 14-control valve, 15-heat-supplementing electromagnetic valve and 16-controller.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be made clear and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, elements that are structurally identical are represented by like reference numerals, and elements that are structurally or functionally similar in each instance are represented by like reference numerals. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components has been exaggerated in some places in the drawings where appropriate for clarity of illustration.
As shown in fig. 1, a constant temperature water chilling unit according to an embodiment of the present invention includes a refrigerant circulation system, a water-cooling auxiliary adjustment system, a heat-supplementing branch adjustment system, and a controller, where the water-cooling auxiliary adjustment system and the heat-supplementing branch adjustment system are respectively connected to the controller,
the refrigerant circulating system comprises a compressor 1, an air-cooled heat exchanger 5, a liquid storage tank 6, an expansion valve 8 and an evaporation heat exchanger 9 which are sequentially connected end to end, wherein the evaporation heat exchanger 9 is embedded in a water tank 11; the constant-temperature water chilling unit further comprises a drying filter 7, and the drying filter 7 is installed between the liquid storage tank 6 and the expansion valve 8 to remove impurities and water vapor in the pipeline. The refrigerant forms high-temperature high-pressure gaseous refrigerant after passing through the compressor 1, after the heat dissipation of the air-cooled heat exchanger 5, the refrigerant is condensed into low-temperature high-pressure liquid refrigerant, the low-temperature high-pressure liquid refrigerant forms low-temperature low-pressure refrigerant liquid after being throttled by the expansion valve 8, the low-temperature low-pressure refrigeration liquid absorbs heat through the evaporation heat exchanger 9 and is evaporated to form gaseous refrigerant, and the gaseous refrigerant enters the compressor 1 again, so that a refrigeration cycle is formed.
The water-cooling auxiliary adjusting system comprises a water tank 11, a second one-way valve 12, a water pump 13, an adjusting water-cooling heat exchanger 3, a control valve 14, a bypass electromagnetic valve 2, a first one-way valve 4 and a temperature sensor 10, wherein the temperature sensor 10 is installed at a water outlet of the water tank 11 and used for monitoring the water temperature in the water tank 11, and the bypass electromagnetic valve 2 is an electromagnetic valve with an adjustable opening degree. The water tank 11, the second one-way valve 12, the water pump 13, the adjusting water-cooling heat exchanger 3 and the control valve 14 are sequentially connected to form a water circulation loop, water in the water tank 11 reaches the adjusting water-cooling heat exchanger 3 through the second one-way valve 12 and the water pump 13, and returns to the water tank 11 through the control valve 14 after absorbing heat, so that the heat of the water in the water tank 11 is increased. The bypass electromagnetic valve 2, the adjusting water-cooling heat exchanger 3, the first one-way valve 4 and the liquid storage tank 6 form a heat supplementing bypass, the refrigerant forms a high-temperature high-pressure gaseous refrigerant after passing through the compressor 1, and the refrigerant flows into the liquid storage tank 6 through the bypass electromagnetic valve 2, the adjusting water-cooling heat exchanger 3 and the first one-way valve 4 to increase the heat exchange amount for a water path, so that the water temperature in the water tank 11 is adjusted. The controller 16 controls the opening and closing of the water pump 13 and the control valve 14, and when the bypass solenoid valve 2 is opened, the water pump 13 and the control valve 14 are also opened simultaneously.
In the preferred embodiment of the invention, the adjusting water-cooling heat exchanger 3 adopts a small-sized tubular or plate heat exchanger to realize the heat exchange between the refrigerant and the water channel.
The heat supplementing branch adjusting system comprises a heat supplementing electromagnetic valve 15, wherein the heat supplementing electromagnetic valve 15 is an electromagnetic valve with an adjustable opening degree, one end of the heat supplementing branch adjusting system is connected between the compressor 1 and the air-cooled heat exchanger 5, the other end of the heat supplementing branch adjusting system is connected to the liquid storage tank 6, and the heat in the heat supplementing branch adjusting system is adjusted by opening or closing the heat supplementing electromagnetic valve 15, so that the internal refrigerating capacity is adjusted. Specifically, when detecting the temperature decline of water tank 11, open concurrent heating solenoid valve 15, will form high temperature high pressure gaseous state refrigerant behind compressor 1, flow into this concurrent heating branch road, with the high temperature high pressure gaseous state refrigerant direct inflow liquid storage pot 6 to reduce inside refrigerating output, promote the temperature of water tank 11.
The controller 16 is connected with the temperature sensor 10, the bypass electromagnetic valve 2 and the heat-supplementing electromagnetic valve 15, can collect the temperature value of the temperature sensor 10, controls the opening and closing of the bypass electromagnetic valve 2 and the heat-supplementing electromagnetic valve 15 according to the requirement, and controls the refrigerating capacity of the refrigerant circulating system, the water-cooling auxiliary regulating system and the heat exchange capacity supplemented by the heat-supplementing branch regulating system, so that the outlet temperature of the water tank 11 reaches a dynamic balance state, and the accurate control is realized.
According to the constant-temperature water chilling unit provided by the embodiment of the invention, the PID controller is adopted in the controller 16, the outlet temperature is detected in real time by acquiring the temperature sensor 10 arranged at the outlet of the water tank 11 in real time, proportional, integral and differential algorithm control is carried out on the temperature, and the outlet temperature of the water tank 11 is accurately controlled according to the set temperature control threshold value to achieve a dynamic balance state. The specific control method is as follows:
(1) When the outlet temperature of the water tank 11 is lower than the temperature control threshold value, the bypass electromagnetic valve 2 in the water-cooling auxiliary adjusting system is opened, the internal circulating water pump 13 is opened, the control valve 14 is opened, the opening degree of the bypass electromagnetic valve 2 is controlled to control the heat exchange amount of the water-cooling heat exchanger 3 in the water-cooling auxiliary adjusting system, the heat supplementing electromagnetic valve 15 is opened according to the requirement, the heat supplementing amount is controlled by controlling the opening degree of the heat supplementing electromagnetic valve 15, the refrigerating capacity is reduced from the source, and the outlet temperature of the water tank 11 is ensured to be within the temperature control threshold value range.
(2) When the outlet temperature of the water tank 11 is detected to be higher than the temperature control threshold value, the opening degree of the bypass electromagnetic valve 2 is closed or reduced, so that the heat exchange amount in the water-cooling auxiliary adjusting system is reduced, the opening degree of the heat compensation electromagnetic valve 15 is closed or reduced as required, the refrigerating capacity is increased, and the outlet temperature of the water tank 11 is ensured to be within the temperature control threshold value range.
According to the constant-temperature water chilling unit, the air-cooled heat exchanger 5 is adopted, and the small-sized adjusting waterway heat exchanger bypass and the liquid storage tank refrigerant heat supplementing branch are added, so that on one hand, the waterway heat exchanger is used for accurately and reliably adjusting the temperature change in the water tank, on the other hand, the refrigerant heat supplementing branch is used for increasing or reducing the refrigerating capacity, and the temperature in the water tank is balanced through the balance of internal refrigeration and waterway heat exchange.
As shown in fig. 2, a schematic diagram of normal internal cooling trend of the constant temperature water chilling unit according to a preferred embodiment of the present invention is shown, wherein,
the refrigerant is compressed by the compressor 1 to form a high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is cooled by the air cooling radiator 5 and then condensed into a low-temperature high-pressure liquid refrigerant, the low-temperature high-pressure liquid refrigerant flows into the liquid storage tank 6 and the drying filter 7, impurities and moisture in the low-temperature high-pressure liquid refrigerant are removed by the drying filter 7, the low-temperature high-pressure liquid refrigerant flows into the expansion valve 8 and throttled to form low-temperature low-pressure refrigerant liquid, the low-temperature low-pressure refrigerant liquid is evaporated by heat absorption of the evaporation heat exchanger 9 to form a gaseous refrigerant, and the gaseous refrigerant flows back to the compressor 1 to form normal internal refrigeration circulation of the constant-temperature water chilling unit. In the normal internal refrigeration cycle process of this time, the temperature of the water in the water tank 11 is adjusted by absorbing heat through the evaporation heat exchanger 9 embedded in the water tank 11.
As shown in fig. 3, the schematic diagram of the internal refrigeration trend of the constant temperature water chilling unit with the regulated waterway heat exchanger and the heat supplementing branch of the liquid storage tank according to a preferred embodiment of the present invention includes the normal internal refrigeration cycle of the constant temperature water chilling unit and the heat supplementing flow path of the regulated waterway heat exchanger 3 and the heat supplementing branch regulating system as shown in fig. 2, wherein,
on one hand, the refrigerant is compressed by the compressor 1 to form a high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant flows into the air-cooled radiator 5, is condensed into a low-temperature high-pressure liquid refrigerant after being radiated by the air-cooled radiator 5, and the low-temperature high-pressure liquid refrigerant flows into the liquid storage tank 6;
on the other hand, according to the relationship between the outlet temperature of the water tank 11 and the set temperature control threshold value, the controller 16 opens the bypass electromagnetic valve 2, the high-temperature and high-pressure gaseous refrigerant formed by the refrigerant compressed by the compressor 1 flows into the bypass electromagnetic valve 2, is subjected to heat exchange by the water-cooling heat exchanger 3 and flows into the liquid storage tank 6 through the first check valve 4; or the controller 16 opens the heat-supplementing electromagnetic valve 15, and the high-temperature and high-pressure gaseous refrigerant formed after the refrigerant is compressed by the compressor 1 flows into the liquid storage tank 6 through the heat-supplementing electromagnetic valve 15, so that the internal refrigerating capacity is reduced.
The low-temperature high-pressure liquid refrigerant merged in the liquid storage tank 6 flows into a drying filter 7, impurities and moisture in the low-temperature high-pressure liquid refrigerant are removed through the drying filter 7, the low-temperature high-pressure liquid refrigerant flows into an expansion valve 8, low-temperature low-pressure refrigerant liquid is formed after throttling, the low-temperature low-pressure refrigerant liquid is evaporated into gaseous refrigerant through heat absorption of an evaporation heat exchanger 9, and the gaseous refrigerant flows back to the compressor 1.
According to the constant-temperature water chilling unit provided by the embodiment of the invention, through normal internal refrigeration circulation and the heat exchanger with the water regulating path and the heat supplementing branch of the liquid storage tank, the adjustment can be automatically carried out according to the temperature of the water tank 11 and the deviation of the set temperature control threshold value, and the temperature of the constant-temperature water chilling unit can be ensured to be within the range of the set temperature control threshold value through accurate control.
As shown in fig. 4, a schematic diagram of the water circuit circulation regulation trend of the constant temperature water chilling unit according to a preferred embodiment of the present invention is shown, wherein,
the external water flows into the water tank 11, flows into the water-cooling heat exchanger 3 for heat exchange under the action of the second one-way valve 12 and the water pump 13, and the hot water after heat exchange flows back to the water tank 11 through the switch valve 14. The water tank 11 includes a water outlet and a water inlet.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (10)
1. A constant temperature water chilling unit is characterized by comprising a refrigerant circulating system, a water-cooling auxiliary adjusting system, a heat supplementing branch adjusting system and a controller, wherein the water-cooling auxiliary adjusting system and the heat supplementing branch adjusting system are respectively connected with the controller,
the refrigerant circulating system comprises a compressor, an air-cooled heat exchanger, a liquid storage tank, a drying filter, an expansion valve and an evaporation heat exchanger which are sequentially connected end to end;
the water-cooling auxiliary adjusting system comprises a water tank, a water pump, an adjusting water-cooling heat exchanger, a temperature sensor, a control valve and a second one-way valve, wherein the temperature sensor is installed at a water outlet of the water tank and is used for monitoring the water temperature at the outlet of the water tank; the water in the water tank reaches the adjusting water-cooling heat exchanger after passing through the water pump, and returns to the water tank after absorbing heat, so that the heat of the water in the water tank is increased;
the heat supplementing branch adjusting system comprises a heat supplementing electromagnetic valve, one end of the heat supplementing branch adjusting system is connected between the compressor and the air-cooled heat exchanger, and the other end of the heat supplementing branch adjusting system is connected to the liquid storage tank; the heat supplementing branch adjusting system controls the opening degree of the heat supplementing electromagnetic valve through the controller to control the internal refrigerating capacity;
the controller collects the temperature value of the temperature sensor, controls the refrigerating capacity of the refrigerant circulating system and the heat exchange capacity supplemented by the water-cooling auxiliary adjusting system and the heat supplementing branch adjusting system, enables the outlet temperature of the water tank to reach a dynamic balance state, and realizes accurate control.
2. The constant-temperature water chilling unit according to claim 1, wherein the water-cooling auxiliary regulating system further comprises a bypass solenoid valve and a first check valve, one end of the bypass solenoid valve is connected with the regulating water-cooling heat exchanger, the other end of the bypass solenoid valve is connected in series between the compressor and the air-cooling heat exchanger, one end of the first check valve is connected with the regulating water-cooling heat exchanger, and the other end of the first check valve is connected in series between the air-cooling heat exchanger and the liquid storage tank.
3. The constant-temperature water chilling unit according to claim 2, wherein the controller performs algorithm control on the collected temperature, controls the bypass solenoid valve and the heat-supplementing solenoid valve to be opened or closed according to a set temperature control threshold value, and realizes dynamic control on the outlet temperature of the water tank by adopting a specific control mode comprising:
when the temperature of the outlet of the water tank is detected to be lower than the temperature control threshold value, controlling the opening degree of the bypass electromagnetic valve to control the heat exchange amount of the water-cooling auxiliary adjusting system, and controlling the opening degree of the heat supplementing electromagnetic valve to control the heat supplementing amount, so that the refrigerating capacity is reduced from the source;
and when the temperature of the outlet of the water tank is detected to be higher than the temperature control threshold value, closing or reducing the opening degree of the bypass electromagnetic valve to reduce the heat exchange amount of the water-cooling auxiliary adjusting system and closing or reducing the opening degree of the heat supplementing electromagnetic valve to increase the refrigerating capacity.
4. The constant temperature water chilling unit according to claim 3, wherein said algorithmic control of the collected temperature by said controller includes at least one of proportional, integral, derivative algorithmic control of said temperature and supports setting of said temperature control threshold.
5. The constant temperature water chilling unit of claim 4, wherein the controller employs a PID controller.
6. The constant-temperature water chilling unit according to claim 2, wherein the bypass solenoid valve is a solenoid valve with an adjustable opening degree.
7. The constant temperature water chilling unit according to claim 1, wherein the controller in the constant temperature water chilling unit controls the water pump and the control valve to be opened and closed, and when the bypass solenoid valve is opened, the water pump and the control valve are also opened simultaneously.
8. A constant temperature water chilling unit according to claim 1, wherein the evaporative heat exchanger is embedded within the water tank, the evaporative heat exchanger being operative to absorb heat from water within the water tank.
9. The constant-temperature water chilling unit according to claim 1, wherein the regulating water-cooling heat exchanger is a small-sized tube type or plate type heat exchanger, and heat exchange between the refrigerant and the water channel is achieved.
10. The constant-temperature water chilling unit according to claim 1, wherein the supplementary heating solenoid valve is a solenoid valve with an adjustable opening degree.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210942504.XA CN115200242A (en) | 2022-08-08 | 2022-08-08 | Constant-temperature water chilling unit |
| PCT/CN2023/098254 WO2024032116A1 (en) | 2022-08-08 | 2023-06-05 | Constant-temperature water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210942504.XA CN115200242A (en) | 2022-08-08 | 2022-08-08 | Constant-temperature water chilling unit |
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| CN115200242A true CN115200242A (en) | 2022-10-18 |
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| CN202210942504.XA Pending CN115200242A (en) | 2022-08-08 | 2022-08-08 | Constant-temperature water chilling unit |
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| Country | Link |
|---|---|
| CN (1) | CN115200242A (en) |
| WO (1) | WO2024032116A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024032116A1 (en) * | 2022-08-08 | 2024-02-15 | 上海能源建设工程设计研究有限公司 | Constant-temperature water chilling unit |
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| Publication number | Publication date |
|---|---|
| WO2024032116A1 (en) | 2024-02-15 |
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