CN111520973A - Fluid heating and refrigerating system - Google Patents
Fluid heating and refrigerating system Download PDFInfo
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- CN111520973A CN111520973A CN202010359826.2A CN202010359826A CN111520973A CN 111520973 A CN111520973 A CN 111520973A CN 202010359826 A CN202010359826 A CN 202010359826A CN 111520973 A CN111520973 A CN 111520973A
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- cooling plate
- water
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- temperature
- heating
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention provides a fluid heating and refrigerating system, which comprises a first temperature sensor, an electric three-way regulating valve, a fixed-frequency refrigerating system, a flowmeter, a second temperature sensor, a water-cooling plate electric heater, a third temperature sensor, a controller and the like; the water-cooling plate electric heater comprises a shell, a water-cooling plate, a resistance heating block, a ceramic sheet, a wire row and the like. The controller automatically controls the opening of the electric three-way regulating valve and the heating power of the heater, so that the rough adjustment and the fine adjustment of the fluid temperature are realized, and the temperature of the outlet fluid is accurately controlled. The invention can automatically heat or refrigerate the fluid flowing through the system to the required temperature, and has the characteristics of high heat exchange efficiency, rapid temperature adjustment, accurate and stable temperature control and energy conservation.
Description
Technical Field
The invention relates to the field of fluid temperature regulation, in particular to a fluid heating and refrigerating system.
Background
Because the cost investment of the frequency conversion compressor is high, the equipment reliability is relatively poor, and the most widely used in industry is still the constant frequency compressor refrigerating system. The compressor in the constant-frequency refrigerating system is always in constant-frequency operation, so that the adjustable space of the refrigerating capacity of the system is very small and almost unchanged. In some engineering applications, the refrigeration temperature of the system can be roughly controlled by controlling the start and stop of the compressor, but the method has poor temperature control precision, cannot realize precise temperature adjustment, and frequent start can greatly influence the service life of the compressor. Therefore, when the refrigeration temperature needs to be accurately adjusted, the electric heater at the rear end of the refrigeration system is often used for heating the fluid which is already refrigerated in a resistance manner, and the conventional heating and refrigeration equipment is directly connected with the electric heater in series at the rear end of the fixed-frequency refrigeration system, so that when the required refrigeration target temperature is less than the designed refrigeration temperature of the refrigeration system, the electric heater needs to output a large heating power to heat the fluid to the target temperature, the heating time is long, and energy is wasted. In addition, the electric heating modes in the current common fluid heating refrigeration equipment mainly comprise electric heating tube direct heating, electric heating stainless steel tube indirect heating and electromagnetic induction heating, wherein the electric heating tube direct heating is poor in use safety and uneven in heating due to the fact that a heating element is directly contacted with fluid, and the electric heating tube is not suitable for heating special fluids such as fuel oil and the like due to the fact that local temperature is too high; the indirect heating of the electric heating stainless steel pipe has poor heat transfer performance due to small heat exchange area, so that the actual heating efficiency of the heater is very low, the temperature regulation response is slow, and the control is difficult; the production cost and the maintenance cost of the electromagnetic induction heating are high and are not economical.
Disclosure of Invention
Aiming at the problems, the invention provides a novel fluid heating and refrigerating system which has the advantages of good heating safety, uniform heating, high efficiency and quick temperature response; and when the required refrigeration target temperature is less than the designed refrigeration temperature of the refrigeration system and is more, the system can obtain the required target temperature by outputting smaller heating power, the temperature is quickly adjusted, the temperature control is accurate and stable, and the energy is saved.
The invention is realized by the following technical scheme:
a fluid heating and refrigerating system comprises a first temperature sensor, an electric three-way regulating valve, a fixed-frequency refrigerating system, a flowmeter, a second temperature sensor, a water-cooling plate electric heater, a third temperature sensor, a controller and the like, wherein the water-cooling plate electric heater comprises a shell, a water-cooling plate, a resistance heating block, a ceramic sheet, a wire row and the like; a first outlet of the electric three-way regulating valve is communicated with an inlet of the constant-frequency refrigerating system, a second outlet of the electric three-way regulating valve is communicated with an outlet of the constant-frequency refrigerating system and an inlet of the water-cooling plate electric heater, and an inlet of the water-cooling plate electric heater is communicated with an outlet of the constant-frequency refrigerating system and a second outlet of the electric three-way regulating valve; the controller realizes coarse adjustment and fine adjustment of the fluid temperature by automatically controlling the opening of the electric three-way regulating valve and the heating power of the electric heater of the water cooling plate.
As a further optimization of the scheme, a micro flow channel is arranged in the water cooling plate and formed by connecting a plurality of micro flow channel groups in series, and each micro flow channel group is formed by connecting a plurality of single micro flow channels in parallel
In a further preferred embodiment of the present invention, the resistance heating block has a heating resistor embedded therein.
As a further optimization of the scheme, the ceramic sheet is clamped between the resistance heating block and the water cooling plate and is tightly attached to the resistance heating block and the water cooling plate.
As a further optimization of the scheme, a plurality of resistance heating blocks are arranged on the upper side and the lower side of the water cooling plate, and the power of the resistance heating blocks is gradually reduced along the flowing direction of fluid in the water cooling plate.
According to the scheme, the first temperature sensor is installed on the inlet side of the electric three-way regulating valve, the second temperature sensor and the flowmeter are installed on the inlet side of the water-cooling plate electric heater, and the third temperature sensor is installed on the outlet side of the water-cooling plate electric heater.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention adopts the water-cooling plate electric heater to heat the fluid, the water-cooling plate is made of aluminum alloy with good heat conductivity, the micro flow channel in the water-cooling plate can fully enlarge the heat exchange area between the fluid and the water-cooling plate and enhance the turbulent flow effect of the fluid, so the water-cooling plate electric heater has the characteristics of uniform heating, high efficiency and quick temperature response; meanwhile, the electric heater of the water cooling plate adopts a heating block indirect heating mode, and an insulating ceramic sheet is used for isolating the direct contact between the resistance heating block and the water cooling plate, so that the heating safety is improved while the good heat conduction effect is ensured;
2. the invention adopts the controller to control the opening of the electric three-way regulating valve to roughly regulate the fluid temperature and control the heating power of the electric heater of the water cooling plate to finely regulate the fluid temperature, when the required refrigeration target temperature is less than the designed refrigeration temperature of the fixed-frequency refrigeration system for a large amount, the fluid heating refrigeration system can obtain the required target temperature by outputting smaller heating power, the temperature regulation is rapid, the temperature control is accurate and stable, and the energy is saved.
Description of the drawings:
the invention is described in further detail below with reference to the following figures and detailed description:
fig. 1 is a schematic diagram of a fluid heating and cooling system.
FIG. 2 is an isometric view of a water-cooled plate electric heater.
FIG. 3 is a side view of the water-cooled plate electric heater with the outer shell removed.
FIG. 4 is a front view of the water-cooled plate electric heater with the housing removed.
Fig. 5 is a sectional view taken along line a-a of fig. 4, which is a schematic view of the micro flow channel structure inside the water-cooling plate.
The correspondence between each reference numeral and the part name is as follows:
1. a first temperature sensor; 2. an electric three-way regulating valve; 3. a fixed frequency refrigeration system; 4. a flow meter; 5. a second temperature sensor; 6. a water-cooled plate electric heater; 7. a third temperature sensor; 8. a controller; 9. a housing; 10. a water-cooling plate; 11. a resistance heating block; 12. a ceramic sheet; 13. arranging wires; 14. a heater inlet connection; 15. a heater outlet connection; 16. and a heating resistor.
Detailed Description
As shown in fig. 1-5, the present invention is a fluid heating and refrigerating system, which comprises a first temperature sensor 1, an electric three-way regulating valve 2, a fixed-frequency refrigerating system 3, a flow meter 4, a second temperature sensor 5, a water-cooling plate electric heater 6, a third temperature sensor 7, a controller 8, etc.; the electric heater with the water cooling plate comprises a shell 9, the water cooling plate 10, resistance heating blocks 11, ceramic sheets 12, a wire row 13 and the like, wherein the upper side and the lower side of the water cooling plate 10 are respectively provided with a plurality of resistance heating blocks 11, the resistance heating blocks 11 are internally embedded with heating resistors 16 to form independent heat sources, the ceramic sheets 12 tightly attached to the resistance heating blocks 11 and the water cooling plate 10 are arranged between the resistance heating blocks 11 and the water cooling plate 10, the resistance heating blocks 11 and the water cooling plate 10 can be insulated while good heat transfer performance is ensured, and the heating safety is improved; the micro flow channel is arranged in the water cooling plate 10 and formed by connecting a plurality of micro flow channel groups in series, each micro flow channel group is formed by connecting a plurality of single micro flow channels in parallel, and the micro flow channels can fully expand the heat exchange area of the fluid and the water cooling plate 10 and enhance the turbulent flow effect of the flowing fluid, so that the heating efficiency and the heating uniformity of the water cooling plate electric heater 6 are improved, and the heating temperature response is quick; the water cooling plate 10 is made of aluminum alloy, so that the heat conducting performance is good, the heat transfer is rapid, and the temperature response speed of the fluid is further improved; the power of the resistance heating blocks 11 on the two sides of the water cooling plate 10 is gradually reduced along the flowing direction of the fluid in the water cooling plate 10, so that the uniformity of the temperature of the water cooling plate 10 can be effectively improved, local high temperature is avoided, and the heat exchange efficiency is higher; fluid flows into the water cooling plate 10 from the heater inlet joint 14 and flows through the micro flow channel in an S shape, the resistance heating block 11 transfers heat to the fluid through the ceramic sheet 12 and the water cooling plate 10 in sequence, so that the temperature of the fluid is raised, the controller 8 monitors the inlet flow, the inlet temperature, the outlet temperature and the target temperature of the water cooling plate electric heater 6 in real time, and controls the actual heating power of the water cooling plate electric heater 6 in a closed loop mode through PID (proportion integration differentiation), so that the temperature of the outlet fluid is accurately controlled, and the fine adjustment of the temperature of the fluid is realized.
A first outlet of the electric three-way regulating valve 2 is communicated with an inlet of the fixed-frequency refrigerating system 3, a second outlet of the electric three-way regulating valve 2 is communicated with an outlet of the fixed-frequency refrigerating system 3 and an inlet of the water-cooling plate electric heater 6, and an inlet of the water-cooling plate electric heater 6 is communicated with an outlet of the fixed-frequency refrigerating system 3 and a second outlet of the electric three-way regulating valve 2; the fluid is divided into two parts by the electric three-way regulating valve 2 after entering the fluid heating and refrigerating system, one part flows into the fixed-frequency refrigerating system 3 to be cooled and refrigerated, the other part flows into the bypass pipeline, the flow of the two parts of the fluid is controlled by regulating the opening degree of the electric three-way regulating valve 2, the two parts of the fluid are mixed and then enter the water cooling plate electric heater 6 to be heated, and finally the fluid flows out of the fluid heating and refrigerating system. The controller 8 realizes coarse adjustment of the fluid temperature by controlling the opening of the electric three-way regulating valve 2, and realizes fine adjustment of the fluid temperature by controlling the heating power of the water-cooling plate electric heater 6.
When the controller 8 detects that the set target temperature of the system outlet fluid is higher than the temperature of the system inlet fluid, the opening of the electric three-way regulating valve 2 is automatically regulated to enable the fluid to completely flow into the bypass pipeline and then flow into the water-cooling plate electric heater 6 for heating, namely, the constant-frequency refrigerating system 3 has no fluid flowing through and is in a shutdown state, the controller 8 compares the inlet flow, the inlet temperature, the outlet temperature and the target temperature of the water-cooling plate electric heater 6 through real-time analysis, and controls the actual heating power of the water-cooling plate electric heater through PID closed loop, so that the temperature of the system outlet fluid is accurately controlled;
when the controller 8 detects that the set target temperature of the fluid at the outlet of the system is lower than the temperature of the fluid at the inlet of the system, the fixed-frequency refrigerating system 3 is in a running state, the controller 8 firstly performs coarse temperature adjustment on the fluid entering the fluid heating and refrigerating system, and the flow rates of the fluid entering the fixed-frequency refrigerating system 3 and a bypass are adjusted by controlling the opening degree of the electric three-way adjusting valve 2. When the temperature detected by the second temperature sensor 5 is lower than the target temperature by a large amount, the flow of the fluid entering the fixed-frequency refrigeration system 3 is gradually reduced, and the flow of the fluid entering the bypass is increased until the temperature of the mixed fluid detected by the second temperature sensor 5 is lower than the target temperature by a small amount; when the detected temperature of the second temperature sensor 5 is higher than the target temperature, the flow of the fluid entering the fixed-frequency refrigeration system 3 is gradually increased, and the flow of the fluid entering the bypass is decreased until the detected temperature of the second temperature sensor 5 is lower than the target temperature. And then finely adjusting the temperature of the mixed fluid, analyzing and comparing the inlet flow, the inlet temperature, the outlet temperature and the target temperature of the electric water-cooling plate heater 6 in real time by the controller 8, adopting PID (proportion integration differentiation) to control the actual heating power of the electric water-cooling plate heater 6 in a closed loop manner, accurately controlling the temperature of the fluid at the outlet of the system, and realizing the fine adjustment of the temperature of the fluid. Because the temperature difference between the roughly adjusted mixed fluid temperature and the target temperature is small, the electric heater 6 of the water cooling plate can quickly reach the required target temperature by only outputting small heating power, so that the energy is saved, and the temperature adjustment is quick.
The above description is only for the purpose of illustrating the embodiments of the present invention and is not intended to limit the scope of the present invention, therefore, any modifications, equivalents, improvements, etc. made under the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. A fluid heating and refrigerating system is characterized by comprising a first temperature sensor (1), an electric three-way regulating valve (2), a fixed-frequency refrigerating system (3), a flowmeter (4), a second temperature sensor (5), a water-cooling plate electric heater (6), a third temperature sensor (7), a controller (8) and the like, wherein the water-cooling plate electric heater comprises a shell (9), a water-cooling plate (10), a resistance heating block (11), a ceramic sheet (12), a wire row (13) and the like; a first outlet of the electric three-way regulating valve (2) is communicated with an inlet of the fixed-frequency refrigerating system (3), a second outlet of the electric three-way regulating valve (2) is communicated with an outlet of the fixed-frequency refrigerating system (3) and an inlet of the water-cooling plate electric heater (6), and an inlet of the water-cooling plate electric heater (6) is communicated with an outlet of the fixed-frequency refrigerating system (3) and a second outlet of the electric three-way regulating valve (2); the controller (8) realizes coarse adjustment and fine adjustment of the fluid temperature by automatically controlling the opening of the electric three-way regulating valve (2) and the heating power of the water-cooling plate electric heater (6).
2. A fluid heating refrigeration system as recited in claim 1 wherein: the water cooling plate (10) is internally provided with a micro flow channel, the micro flow channel is formed by connecting a plurality of micro flow channel groups in series, and the micro flow channel group is formed by connecting a plurality of single micro flow channels in parallel.
3. A fluid heating refrigeration system as recited in claim 1 wherein: and a heating resistor (16) is embedded in the resistor heating block (11).
4. A fluid heating refrigeration system as recited in claim 1 wherein: the ceramic sheet (12) is clamped between the resistance heating block (11) and the water cooling plate (10) and is tightly attached to the resistance heating block (11) and the water cooling plate (10).
5. A fluid heating refrigeration system as recited in claim 1 wherein: a plurality of resistance heating blocks (11) are installed on the upper side and the lower side of the water cooling plate (10), and the power of the resistance heating blocks (11) is gradually reduced along the flowing direction of fluid inside the water cooling plate (10).
6. A fluid heating refrigeration system as recited in claim 1 wherein: the first temperature sensor (1) is installed at the inlet side of the electric three-way regulating valve (2), the flow meter (4) and the second temperature sensor (5) are installed at the inlet side of the water cooling plate electric heater (6), and the third temperature sensor (7) is installed at the outlet side of the water cooling plate electric heater (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010359826.2A CN111520973A (en) | 2020-04-30 | 2020-04-30 | Fluid heating and refrigerating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010359826.2A CN111520973A (en) | 2020-04-30 | 2020-04-30 | Fluid heating and refrigerating system |
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| Publication Number | Publication Date |
|---|---|
| CN111520973A true CN111520973A (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010359826.2A Pending CN111520973A (en) | 2020-04-30 | 2020-04-30 | Fluid heating and refrigerating system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104571223A (en) * | 2015-02-10 | 2015-04-29 | 广东吉荣空调有限公司 | Ultra-precise water temperature control device applied to high-end equipment cooling |
| CN106325334A (en) * | 2016-11-22 | 2017-01-11 | 北京瑞尔腾普科技有限公司 | Temperature control system, environmental simulation system and reliability test equipment |
| US20170190561A1 (en) * | 2016-01-05 | 2017-07-06 | Cleland Sales Corporation | Preferential distribution of cooling capacity |
| CN107318180A (en) * | 2017-08-23 | 2017-11-03 | 湖南智热技术股份有限公司 | A kind of use heat-conducting plate heats the electric heater of fluid |
| CN109464979A (en) * | 2018-11-02 | 2019-03-15 | 浙江六合工程技术有限公司 | Temperature control loop based on PID controller |
| EP3470509A1 (en) * | 2017-10-11 | 2019-04-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method and installation for cooling the neck of bottles using a solid heat carrier fluid |
-
2020
- 2020-04-30 CN CN202010359826.2A patent/CN111520973A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104571223A (en) * | 2015-02-10 | 2015-04-29 | 广东吉荣空调有限公司 | Ultra-precise water temperature control device applied to high-end equipment cooling |
| US20170190561A1 (en) * | 2016-01-05 | 2017-07-06 | Cleland Sales Corporation | Preferential distribution of cooling capacity |
| CN106325334A (en) * | 2016-11-22 | 2017-01-11 | 北京瑞尔腾普科技有限公司 | Temperature control system, environmental simulation system and reliability test equipment |
| CN107318180A (en) * | 2017-08-23 | 2017-11-03 | 湖南智热技术股份有限公司 | A kind of use heat-conducting plate heats the electric heater of fluid |
| EP3470509A1 (en) * | 2017-10-11 | 2019-04-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method and installation for cooling the neck of bottles using a solid heat carrier fluid |
| CN109464979A (en) * | 2018-11-02 | 2019-03-15 | 浙江六合工程技术有限公司 | Temperature control loop based on PID controller |
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Application publication date: 20200811 |
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