CN114791165B - Closed circulation system based on pressure control and method thereof - Google Patents
Closed circulation system based on pressure control and method thereof Download PDFInfo
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- CN114791165B CN114791165B CN202210512160.9A CN202210512160A CN114791165B CN 114791165 B CN114791165 B CN 114791165B CN 202210512160 A CN202210512160 A CN 202210512160A CN 114791165 B CN114791165 B CN 114791165B
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- water pump
- air conditioner
- pressure
- circulating water
- conditioner host
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a closed circulation system based on pressure control and a method thereof, wherein the closed circulation system comprises an air conditioner host, a water flow switch, a circulating water pump, a pressure sensor, a one-way valve, a pressure tank A, a tail end valve, an air conditioner tail end and a pressure tank B; the output of air conditioner host computer is connected to circulating water pump through the rivers switch, and circulating water pump's output is connected the input of check valve, and the terminal input of air conditioner is connected through terminal valve to the output of check valve, and the terminal input of air conditioner host computer is connected to the terminal output of air conditioner, and on the pipeline of overhead check valve output was inserted to overhead tank A, overhead tank B inserted on the pipeline of air conditioner host computer input, pressure sensor connects in parallel on circulating water pump's output pipeline, and pressure sensor and circulating water pump communication are connected, and circulating water pump opens and stops the pressure sensor control. The invention can effectively avoid continuous operation of the circulating water pump when the tail end of the air conditioner is not operated, and reduce the operation energy consumption.
Description
Technical Field
The invention relates to the technical field of heating ventilation and air conditioning, in particular to a closed circulation system based on pressure control and a method thereof.
Background
One of the control modes of the traditional closed circulation system adopted by the air-conditioning water system in the market at present is to control the starting and stopping of the air-conditioning host according to the water supply and return temperatures of the air-conditioning host, namely, when the water return temperature of the air-conditioning host is continuously lower than a set value, the air-conditioning host stops running, and when the water return temperature is higher than the set value, the air-conditioning host starts running. Therefore, in order to monitor the backwater temperature of the air conditioner host in real time, even if the tail end of the air conditioner does not operate, the circulating water pump also needs to continuously operate, consumes energy and increases the operation energy consumption. The second control mode of the traditional closed circulation system is to control the water pump to start and stop according to the outlet pressure of the water pump, namely, when the outlet pressure of the water pump is higher than the upper limit of a set value, the water pump stops running, and when the outlet pressure of the water pump is lower than the lower limit of the set value, the water pump starts running. Therefore, after the circulating water pump is stopped, the air conditioner host machine stop time is caused, at the moment, the evaporator of the air conditioner host machine has the risk of supercooling and freezing account cracking, and in addition, when the tail end valve is frequently opened and closed or the water flow of the water system is greatly changed, the water pump can be frequently started and stopped, the starting and stopping energy consumption of the water pump is increased, the failure rate of the water pump is improved, and the service life of the water pump is prolonged.
Disclosure of Invention
The invention aims to provide a closed circulation system and a method based on pressure control, which avoid continuous operation of a circulating water pump when an air conditioner is not in operation at the tail end and avoid frequent start and stop of the circulating water pump.
The technical scheme adopted by the invention is as follows:
a closed circulation system based on pressure control comprises an air conditioner host, a water flow switch, a circulating water pump, a pressure sensor, a one-way valve, a pressure tank A, a tail end valve, an air conditioner tail end and a pressure tank B; the output of air conditioner host computer is connected to circulating water pump through the rivers switch, and circulating water pump's output is connected the input of check valve, and the terminal input of air conditioner is connected through terminal valve to the output of check valve, and the terminal input of air conditioner host computer is connected to the terminal output of air conditioner, and on the pipeline of overhead check valve output was inserted to overhead tank A, overhead tank B inserted on the pipeline of air conditioner host computer input, pressure sensor connects in parallel on circulating water pump's output pipeline, and pressure sensor and circulating water pump communication are connected, and circulating water pump opens and stops the pressure sensor control.
Further, the pressure sensor can monitor the outlet pressure of the circulating water pump in real time, set the upper limit value and the lower limit value of the pressure, send a pump starting signal to the circulating water pump when the monitored pressure is lower than the lower limit value of the set value, and send a pump stopping signal to the circulating water pump when the monitored pressure is higher than the upper limit value of the set value.
Further, the circulating water pump makes corresponding opening and closing actions according to the received start and stop signals.
Further, the air conditioner host has a backwater temperature detection function, a backwater temperature value is set, operation is started when the backwater temperature is detected to be higher than a set value, and operation is stopped when the backwater temperature is detected to be lower than the set value.
A closed cycle method based on pressure control, comprising the following operating steps:
step 1, detecting pressure by a pressure sensor, and judging whether the detected outlet pressure of the water pump is lower than a set value lower limit; if yes, sending a pump starting signal to a circulating water pump, starting the circulating water pump to operate, enabling a water flow switch to maintain an on state by water flow, enabling the pressure of a pressure tank A to be larger than that of a pressure tank B, and executing the step 2; otherwise, executing the step 5;
The invention adopts the technical scheme that the air conditioner consists of an air conditioner host, a water flow switch, a circulating water pump, a pressure sensor, a one-way valve, a pressure tank A, a tail end valve, an air conditioner tail end and a pressure tank B. The air conditioner comprises an air conditioner main unit, a water flow switch, a circulating water pump, a pressure sensor, a one-way valve, a pressure tank A, a tail end valve, an air conditioner tail end and a pressure tank B, wherein the air conditioner main unit, the water flow switch, the circulating water pump, the pressure sensor, the one-way valve, the pressure tank A, the tail end valve, the air conditioner tail end and the pressure tank B are sequentially communicated through pipelines, the pressure sensor is connected with the circulating water pump through a communication line, and the starting and stopping of the circulating water pump are controlled by the pressure sensor. The invention can effectively avoid continuous operation of the circulating water pump when the tail end of the air conditioner is not operated, and reduce the operation energy consumption.
Drawings
The invention is described in further detail below with reference to the drawings and detailed description;
fig. 1 is a schematic structural diagram of a closed circulation system based on pressure control according to the present invention.
Detailed Description
For the purposes, technical solutions and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, the invention discloses a closed circulation system based on pressure control, which comprises an air conditioner host 1, a water flow switch 2, a circulating water pump 3, a pressure sensor 4, a one-way valve 5, a pressure tank A6, a tail end valve 7, an air conditioner tail end 8 and a pressure tank B9; the output of air conditioner host computer 1 is connected to circulating water pump 3 through water flow switch 2, the input of check valve 5 is connected to the output of circulating water pump 3, the output of check valve 5 passes through terminal valve 7 and connects the terminal 8 input of air conditioner, the terminal 8 input of air conditioner is connected to the terminal 8 input of air conditioner host computer 1, overhead tank A6 inserts on the pipeline of check valve 5 output, overhead tank B9 inserts on the pipeline of air conditioner host computer 1 input, pressure sensor 4 connects in parallel on circulating water pump 3's output pipeline, pressure sensor 4 is connected with circulating water pump 3 communication, circulating water pump 3 opens and stops the pressure sensor 4 control.
Further, the pressure sensor 4 can monitor the outlet pressure of the circulating water pump 3 in real time, set an upper limit value and a lower limit value of the pressure, send a pump start signal to the circulating water pump 3 when the monitored pressure is lower than the lower limit value, and send a pump stop signal to the circulating water pump 3 when the monitored pressure is higher than the upper limit value.
Further, the circulating water pump 3 makes corresponding opening and closing actions according to the received start and stop signals by the water flow switch 2.
Further, the air conditioner host 1 has a backwater temperature detection function, sets a backwater temperature value, starts operation when the backwater temperature is detected to be higher than a set value, and stops operation when the backwater temperature is detected to be lower than the set value.
A closed cycle method based on pressure control, comprising the following operating steps:
step 1, detecting pressure by a pressure sensor, and judging whether the detected outlet pressure of the water pump is lower than a set value lower limit; if yes, sending a pump starting signal to a circulating water pump, starting the circulating water pump to operate, enabling a water flow switch to maintain an on state by water flow, enabling the pressure of a pressure tank A to be larger than that of a pressure tank B, and executing the step 2; otherwise, executing the step 5;
The working principle of the invention is as follows: when the air conditioner terminal 8 operates, the terminal valve 7 is in an open state, the pressure sensor 4 detects that the pressure is lower than the lower limit of the set value, a pump starting signal is sent to the circulating water pump 3, the circulating water pump 3 receives the pump starting signal to start operation, a certain pressure difference is maintained for water supply and return of the air conditioner host 1, at the moment, the pressure tank A6 and the pressure tank B9 also maintain a certain pressure difference, and the pressure of the pressure tank A6 is larger than that of the pressure tank B9. The water flow keeps the water flow switch 2 in an on state, the air conditioner host 1 detects the backwater temperature, the operation is started when the backwater temperature is higher than a set value, the operation is stopped when the backwater temperature is lower than the set value, and the air conditioner host is in a standby state; when the air conditioner end 8 stops running, the end valve 7 is closed, the water flow stops flowing, the water flow switch 2 is closed, and the air conditioner host 1 is prevented from starting running under the condition that the water flow does not flow. And meanwhile, the pressure of the pressure tank A6 rises, and when the pressure sensor 4 detects that the pressure is higher than the upper limit of the set value, the water pump stops running. When the air conditioner is operated again at the tail end 8, the tail end valve 7 is opened, high-pressure water in the pressure tank A6 is conveyed to the pressure tank B9 through tail end equipment because the pressure of the pressure tank A6 is larger than that of the pressure tank B9, the pressure of the pressure tank A6 is gradually reduced, when the pressure is reduced to the lower limit of the set value of the pressure sensor 4, a pump starting signal is sent to the circulating water pump 3, the circulating water pump 3 receives the pump starting signal to start operation, the water flow switch 2 is opened, the air conditioner host 1 in a standby state starts to detect the backwater temperature at the moment, and when the backwater temperature is higher than the set value, the operation is started. The circulation can avoid the continuous operation of the circulating water pump 3 when the air conditioner tail end 8 does not operate, and the operation energy consumption is reduced.
The invention adopts the technical scheme that the air conditioner consists of an air conditioner host 1, a water flow switch 2, a circulating water pump 3, a pressure sensor 4, a one-way valve 5, a pressure tank A6, a tail end valve 7, an air conditioner tail end 8 and a pressure tank B9. The air conditioner host 1, the water flow switch 2, the circulating water pump 3, the pressure sensor 4, the one-way valve 5, the pressure tank A6, the tail end valve 7, the air conditioner tail end 8 and the pressure tank B9 are sequentially communicated through pipelines, the pressure sensor 4 is connected with the circulating water pump 3 through a communication line, and the circulating water pump 3 is controlled by the pressure sensor 4. The invention can effectively avoid the continuous operation of the circulating water pump 3 when the air conditioner tail end 8 does not operate, and reduce the operation energy consumption.
It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. Embodiments and features of embodiments in this application may be combined with each other without conflict. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Claims (4)
1. A closed circulation method based on pressure control adopts a closed circulation system based on pressure control, wherein the system comprises an air conditioner host, a water flow switch, a circulating water pump, a pressure sensor, a one-way valve, a pressure tank A, a tail end valve, an air conditioner tail end and a pressure tank B; the output end of the air conditioner host is connected to the circulating water pump through a water flow switch, the output end of the circulating water pump is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the input end of the air conditioner terminal through a terminal valve, the output end of the air conditioner terminal is connected with the input end of the air conditioner host, the pressure tank A is connected to a pipeline of the output end of the one-way valve, the pressure tank B is connected to a pipeline of the input end of the air conditioner host, the pressure sensor is connected to an output pipeline of the circulating water pump in parallel, the pressure sensor is connected with the circulating water pump in a communication way, and the starting and stopping of the circulating water pump are controlled by the pressure sensor; the method is characterized in that: the method comprises the following operation steps:
step 1, detecting pressure by a pressure sensor, and judging whether the detected outlet pressure of the water pump is lower than a set value lower limit; if yes, sending a pump starting signal to a circulating water pump, starting the circulating water pump to operate, enabling a water flow switch to maintain an on state by water flow, enabling the pressure of a pressure tank A to be larger than that of a pressure tank B, and executing the step 2; otherwise, executing the step 5;
step 2, detecting backwater temperature by the air conditioner host, and judging whether the backwater temperature is higher than a set value; if yes, executing the step 3; otherwise, executing the step 5;
step 3, judging whether the water flow switch is in an on state or not; if yes, the air conditioner host starts to operate, and step 4 is executed; otherwise, executing the step 1;
step 4, detecting backwater temperature by the air conditioner host, and judging whether the backwater temperature is higher than a set value; if yes, the air conditioner host continues to operate, and step 4 is executed; otherwise, controlling the air conditioner host to stop running, wherein the air conditioner host is in a standby state, and executing the step 5;
step 5, detecting pressure by the pressure sensor, and judging whether the detected outlet pressure of the water pump is higher than the upper limit of a set value; if yes, sending a pump stopping signal to the circulating water pump, stopping the running of the circulating water pump, stopping the flow of water flow to enable the water flow switch to maintain a closed state, and executing the step 1; otherwise, executing the step 6;
step 6, detecting pressure by the pressure sensor, and judging whether the detected outlet pressure of the water pump is lower than a set value lower limit; if yes, the circulating water pump continues to operate, and the step 2 is executed; otherwise, step 5 is performed.
2. A closed cycle method based on pressure control according to claim 1, characterized in that: the pressure sensor can monitor the outlet pressure of the circulating water pump in real time, set the upper limit value and the lower limit value of the pressure, send a pump starting signal to the circulating water pump when the monitored pressure is lower than the lower limit value of the set value, and send a pump stopping signal to the circulating water pump when the monitored pressure is higher than the upper limit value of the set value.
3. A closed cycle method based on pressure control according to claim 1, characterized in that: when the circulating water pump is started and stopped according to the received start and stop signals, the water flow switch makes corresponding opening and closing actions.
4. A closed cycle method based on pressure control according to claim 1, characterized in that: the air conditioner host has a backwater temperature detection function, a backwater temperature value can be set, the operation is started when the backwater temperature is monitored to be higher than a set value, and the operation is stopped when the backwater temperature is monitored to be lower than the set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210512160.9A CN114791165B (en) | 2022-05-11 | 2022-05-11 | Closed circulation system based on pressure control and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210512160.9A CN114791165B (en) | 2022-05-11 | 2022-05-11 | Closed circulation system based on pressure control and method thereof |
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| Publication Number | Publication Date |
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| CN114791165A CN114791165A (en) | 2022-07-26 |
| CN114791165B true CN114791165B (en) | 2023-04-28 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001182971A (en) * | 1999-12-24 | 2001-07-06 | Hitachi Ltd | Air conditioning system and its control method |
| CN102269444A (en) * | 2011-05-27 | 2011-12-07 | 哈尔滨工业大学 | Energy control system and method of heat supply and cold water supply circulation |
| CN105135639A (en) * | 2015-09-24 | 2015-12-09 | 宝莲华新能源技术（上海）有限公司 | Energy-saving control system for ground source heat pump multi-air-conditioning units |
| CN205425317U (en) * | 2016-01-19 | 2016-08-03 | 河南海林自控设备有限公司 | People anti cold freezes station energy -saving monitoring system |
| CN109990519B (en) * | 2019-04-17 | 2020-12-22 | 南京天加环境科技有限公司 | Air source heat pump anti-freezing control method |
| CN211551977U (en) * | 2019-12-26 | 2020-09-22 | 中科建创工程有限公司 | Intelligent control variable frequency regulating system for air conditioner circulating water pump |
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