CN111981548B - Heating ventilation air conditioning pipe network circulating pump water system and power-saving operation method thereof - Google Patents
Heating ventilation air conditioning pipe network circulating pump water system and power-saving operation method thereof Download PDFInfo
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- CN111981548B CN111981548B CN202010443457.5A CN202010443457A CN111981548B CN 111981548 B CN111981548 B CN 111981548B CN 202010443457 A CN202010443457 A CN 202010443457A CN 111981548 B CN111981548 B CN 111981548B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000004378 air conditioning Methods 0.000 title claims abstract description 19
- 238000009423 ventilation Methods 0.000 title claims abstract description 16
- 230000008859 change Effects 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
Abstract
The invention belongs to the technical field of heating ventilation air conditioners, and particularly relates to a heating ventilation air conditioner pipe network circulating pump water system and an electricity-saving operation method thereof, wherein the circulating pump water system consists of a circulating pump, an electric ball valve and an electricity-saving controller, and the electricity-saving controller is used for acquiring necessary circulating pump operation signals and outputting circulating pump frequency control signals; the energy-saving operation method of the circulating pump embedded in the energy-saving controller can realize the constant frequency, constant pressure difference, constant temperature difference and constant flow operation of the circulating pump according to the requirements of the heating, ventilating and air conditioning system, not only realizes the energy saving of the circulating pump, but also can expand a plurality of pumps to enable the plurality of pumps to be used together, and the heating, ventilating and air conditioning pipe network water system using the circulating pump with one standby, two purposes, one standby and the like can operate in the most energy-saving mode.
Description
Technical Field
The invention belongs to the technical field of heating, ventilating and air conditioning, and particularly relates to a heating, ventilating and air conditioning pipe network circulating pump water system and an electricity-saving operation method thereof.
Background
In the existing heating ventilation air-conditioning pipe network, the resistance of the inlet and outlet pipelines of the circulating pump and the resistance of the check valve occupy a considerable proportion, if the circulating pump runs for a long time, much electric energy is wasted, for example, the local resistance generated by the check valve at the outlet of the circulating pump is very wasted.
The existing heat supply unit is usually provided with circulating pumps in a one-use one-standby mode, one pump is usually used, the other pump is used for backup, the two pumps alternately operate and are backup, however, electricity is not saved in the operation, because the inlet and outlet pipelines of each circulating pump are designed according to one pump, the resistance is designed resistance, and generally, the resistance is between 2 and 5 meters; if two pumps are used for replacing one pump to run, namely the standby pump is used, the resistance of the water inlet pipe and the water outlet pipe of the circulating pump can be greatly reduced, the principle is that when the double pumps are used for replacing the single pump to run, each pump only shares half of the flow, the flow is reduced to 1/2, and the resistance is reduced to 1/4; when the double pumps replace the single pump to operate, the double pumps need to operate at the same frequency, and under the condition of no check valve, the hydraulic instability of the two pumps is easily caused, so that the parallel operation condition is broken down.
The technology of dragging a plurality of water pumps is to drag a plurality of water pumps by using a frequency converter, wherein the water pumps run at power frequency, and the frequency conversion water pumps driven by the frequency converter are also used.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heating ventilation air-conditioning pipe network circulating pump water system and a power-saving operation method thereof, which realize power saving of a circulating pump, need to replace a single-flow valve with an electric ball valve, need to set one circulating pump as a main pump and other pumps as auxiliary pumps in order to meet stable operation of replacing the single pump by the double pump, and need to be provided with related regulators to realize frequency regulation of the main pump and the auxiliary pumps.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heating and ventilation air-conditioning pipe network circulating pump water system comprises a circulating pump, an electric ball valve and a circulating pump electricity-saving controller, wherein a primary side water supply pipe is connected with a heat exchanger, the primary side water supply pipe is connected with the heat exchanger, the heat exchanger is connected with a water supply pipe, a water supply pressure sensor and a water supply temperature signal interface are connected on the water supply pipe, a heat user is connected at the tail end of the water supply pipe, the heat user is connected with a water return pipe, a water return temperature signal interface, a water return pressure sensor and a flow meter are connected on the water return pipe, the water return pipe is connected with a first pump water inlet pipe and a second pump water inlet pipe, the first pump water inlet pipe is connected with a first pump inlet manual ball valve, a soft joint second, a first pump, a second pump, a soft joint fourth pump, a second pump outlet electric ball valve and a first pump water outlet pipe, no. one pump outlet pipe and No. two pump outlet pipe connect the wet return, and wet return end connection heat exchanger, the heat exchanger connects once a side wet return, and No. one pump converter is connected to No. one pump, and No. two pump converter are connected to No. two pumps, and No. one pump regulator and No. two pump regulators are established respectively to No. one pump and No. two pumps.
The circulating pump electricity-saving controller is provided with an external frequency input interface, an external pressure difference input interface, an external flow input interface, a touch screen, an analog quantity interface of the controller, a modulus output interface of the controller, a digital quantity output interface of the controller, a flow meter interface of the controller, an RS485 interface of the controller, a touch screen interface and an external temperature difference signal interface, and is provided with a corresponding regulator.
A plurality of pumps can be expanded, the circulating pump can be used for one purpose or for another, and three pumps can be used simultaneously.
A heating ventilation air-conditioning pipe network circulating pump water system electricity-saving operation method comprises the following steps:
s1: before the circulating pump is started, the electric ball valve is closed; after the circulating pump is started, the electric ball valve is started; before stopping the pump, the electric ball valve is closed firstly;
s2: the circulating pump system with one use and one standby enables the two circulating pumps to simultaneously run at the same frequency;
(1) the first pump control method comprises the following steps: the first pump regulator is used for ensuring the running parameters of a pipe network, outputting a frequency signal required by the first pump, providing a following frequency signal for other pumps, inputting a given signal and an actual signal to be connected with a comparison link, inputting an error signal output by the comparison link into the first pump regulator, outputting the frequency signal required by the first pump regulator, connecting the frequency signal with a frequency converter of the first pump, controlling the output of the frequency converter to change the rotating speed of the No. 1 water pump, causing the change of the flow rate and the pressure difference of the pipe network or the change of the temperature difference, causing the change of the actual signal, connecting the actual signal with the comparison link to form negative feedback, adopting feedback control for the first pump control, wherein the controlled quantity is the rotating speed of a circulating pump, and the manipulated quantity is the frequency of the frequency converter;
the first pump regulator is used for regulating frequency, pressure difference, temperature difference or flow, has different parameters for different regulating objects, and has the following regulating algorithm:
when T = T1, f1= fk1+ k1m ^ a + k2 Σ m when T ≠ T1, f1= f1 when m < ± b, f1= f 1;
where f1 is the pump inverter frequency number two; m is the difference between the given signal and the actual signal; fk1 is the average of the frequencies of the first 24 hours of inverter operation; k1 is an empirical coefficient, and the value range is 0.1-10; k2 is an empirical coefficient, and the value range is 0.1-2; a is an index coefficient, and the value range is 1-2; b is an empirical coefficient, and the value range is 0.1-1; t1 is the control period; the given amount may be: an external frequency signal, an external differential pressure signal, an external flow signal, or an external differential temperature signal; the actual signal as feedback can be the actual frequency of a frequency converter, the pressure difference of a pipe network, the flow of the pipe network or the temperature difference of the pipe network;
(2) the second pump control method is as follows: the second pump regulator outputs a frequency fine-tuning signal to make the motor current of the second pump follow the current of the first pump motor and be consistent with the pump output force of the first pump, the error signal of the current signal from the first pump motor and the current signal from the second pump motor are compared in a comparison link and then input into the second pump regulator, the second pump regulator outputs the frequency fine-tuning signal, the first pump frequency signal and the output frequency fine-tuning signal are compared in the comparison link and then output into the second pump frequency converter, the second pump frequency signal is output into the second pump frequency converter, the output of the second pump frequency converter is controlled to change the rotating speed of the second pump, the second pump motor current signal is the feedback signal of the second pump regulator, the frequency change of the second pump frequency converter is controlled to further cause the current signal change of the second pump motor, and the current of the second pump motor is equal to the current of the first pump motor, ensuring that the output of the second pump is the same as the output of the first pump, namely when the current of the second pump is greater than that of the first pump, indicating that the load of the second pump is increased, reducing the frequency of a frequency converter of the second pump, reducing the rotating speed of the second pump and reducing the load of the second pump;
the second pump regulation algorithm is as follows:
when T = T2, f2= fk2+ k3n ^ c + k4 Σ n; when T ≠ T2, f2= f 2; when n < ± d, f2= f 2;
where f2 is the pump inverter frequency number two; n is the difference between the first pump motor current and the second pump motor current; fk2 is the average of the frequencies of the first 24 hours of inverter operation; k3 is an empirical coefficient, and the value range is 0.1-5; k4 is an empirical coefficient, and the value range is 0.1-3; c is an index coefficient, and the value range is 1-3; d is an empirical coefficient, the value range is 0.1-2, and T2 is a control period;
the frequency fine tuning signal output by the second pump regulator is used for modifying the frequency of the second pump frequency converter, so that the motor current of the second pump follows the current of the first pump motor and keeps consistent with the pumping force of the first pump;
in order to ensure the safety of the pipe network, the upper and lower limits of the operating frequency of each circulating pump are correctly set, namely the pipe network is not overpressured when the double pumps operate; current parameters of each circulating pump are also required to be correctly set, so that no overcurrent is caused when a single circulating pump operates;
s3: according to the principle, a plurality of pumps can be expanded and used simultaneously;
s4: in order to avoid the occurrence of unstable hydraulic working conditions among a plurality of circulating pumps, a frequency tracking technology is adopted, namely, a plurality of pumps run, wherein one pump is a main pump, and the other pumps are auxiliary pumps to track the operation of the other pump; meanwhile, a current comparison technology is adopted, when the difference between the motor current of the auxiliary pump and the motor current of the main pump is too large, a fine adjustment frequency signal is output, the operating frequency of the auxiliary pump is modified, the multi-pump system can operate stably, and the parameters of the regulator are set on the touch screen according to the difference of control objects.
Compared with the prior art, the invention has the advantages of simple structure, reasonable design, realization of electricity saving and stable operation by replacing a single circulating pump with a double circulating pump, considerable electricity saving by adopting the electric ball valve and energy saving.
Drawings
FIG. 1 is a block diagram of an energy saving system and control of a circulating pump of a heating ventilation air conditioning pipe network;
FIG. 2 is a main flow chart of the operation process
In the drawings: 1. an external frequency signal interface; 2. an external differential pressure signal interface; 3. an external traffic signal interface; 4. a circulating pump power-saving controller; 5. a touch screen; 6. an analog quantity interface of the controller; 7. an analog output interface of the controller; 8. a digital quantity output interface of the controller; 9 flow meter interface of controller; 10. a heat exchanger; 11. a primary-side water supply pipe; 12. a primary side water return pipe; 13. a water supply pressure sensor; 14. a backwater pressure sensor; 15. a water return pipe; 16. a water supply pipe; 17. a flow meter; 18. an inlet manual ball valve of the pump 1; 19. a manual ball valve at the inlet of the pump 2; 20. a first soft joint; 21. a second soft joint; 22. a third soft joint; 23. a fourth soft joint; 24. a first pump; 25. a second pump; 26. a second pump frequency converter; 27. a first pump frequency converter; 28. an outlet electric ball valve of the first pump; 29. an outlet electric ball valve of the second pump; 30. a first pump water inlet pipe; 31. a second pump water inlet pipe; 32. a first pump water outlet pipe; 33. a water outlet pipe of the second pump; 34. a controller RS485 interface; 35. a touch screen interface; 36. a return water temperature signal interface; 37. a water supply temperature signal interface; 38. an external temperature difference signal interface; 39. inputting a given signal (frequency, pressure difference or flow rate); 40. a comparison step between the given quantity and the actual quantity; 41. actual signal (frequency, pressure differential or flow); 42. an error signal between the given quantity and the actual quantity; 43. a first pump regulator; 44. a pump frequency signal; 45. comparing the first pump frequency with the second pump fine tuning frequency signal; 46. pump motor current; 47. comparing the current of the first pump motor with the current of the second pump motor; 48. current error signals of the first pump and the second pump; 49. a second pump regulator; 50. a second pump current signal; 51. a second pump frequency signal; 52. pump frequency fine tuning signal two.
Detailed Description
The present invention will be described below by way of examples with reference to the accompanying drawings.
Referring to fig. 1, a heating ventilation air-conditioning pipe network circulating pump water system comprises a circulating pump, an electric ball valve and a circulating pump power-saving controller, wherein a primary side water supply pipe is connected with a heat exchanger, a primary side water supply pipe 11 is connected with the heat exchanger 10, the heat exchanger 10 is connected with a water supply pipe 16, the water supply pipe 16 is connected with a water supply pressure sensor 13 and a water supply temperature signal interface 37, the tail end of the water supply pipe 16 is connected with a heat consumer, the heat consumer is connected with a water return pipe 15, the water return pipe 15 is connected with a water return temperature signal interface 35, a water return pressure sensor 14 and a flow meter 17, the water return pipe 15 is connected with a first pump water inlet pipe 30 and a second pump water inlet pipe 31, the first pump water inlet pipe 30 is connected with a first pump inlet manual ball valve 18, a second soft joint 21, a first pump 24, a third soft joint 22, a first pump outlet electric ball valve 28 and a first pump water outlet pipe 32, the second pump water inlet pipe 31 is connected with a second pump inlet manual ball valve 19, a first soft joint 20, The first pump 25 is connected with the first pump frequency converter 27, the second pump 25 is connected with the second pump frequency converter 26, and the first pump 24 and the second pump 25 are respectively provided with a first pump regulator and a second pump regulator.
The circulating pump electricity-saving controller is provided with an external frequency input interface 1, an external pressure difference input interface 2, an external flow input interface 3, a touch screen 5, an analog quantity interface 6 of the controller, a modulus output interface 7 of the controller, a digital quantity output interface 8 of the controller, a flow meter interface 9 of the controller, a controller RS485 interface 34, a touch screen interface 35 and an external temperature difference signal interface 38, is provided with a corresponding regulator, and has the functions of pipe network frequency control, water supply and return pressure difference control or flow control of a heating and ventilation air-conditioning water system needing to operate; the device comprises an external frequency input interface 1 for connecting an external frequency signal, an external pressure difference input interface 2 for connecting an external pressure difference signal, an external flow input interface 3 for connecting an external flow signal, an analog input interface 6 for connecting the pressure of a water supply return pipe when an input circulating pump operates, the current frequency and the current of a frequency converter, an analog output interface 7 for connecting the frequency signal input end of the frequency converter of the circulating pump, a switching value output interface 8 for connecting electric ball valve actuators on water outlet pipes of the circulating pumps 1 and 2, a digital interface 9 for connecting a signal terminal of a flow meter, an RS485 interface 34 for connecting the digital communication port of the frequency converter, an external temperature difference input interface 38 for connecting an external temperature difference signal and controlling the temperature difference of the water supply return pipe, and a touch screen interface 35 for connecting a touch screen 5.
And a plurality of pumps can be expanded and used simultaneously.
A heating ventilation air-conditioning pipe network circulating pump water system electricity-saving operation method comprises the following steps:
s1: before the circulating pump is started, the electric ball valve is closed; after the circulating pump is started, the electric ball valve is started; before stopping the pump, the electric ball valve is closed firstly;
s2: a one-use one-standby circulating pump system, which enables two circulating pumps to simultaneously operate at the same frequency, as shown in figure 2;
(1) the first pump control method comprises the following steps: the first pump regulator is used for ensuring the running parameters of a pipe network, outputting a frequency signal required by the first pump, providing a following frequency signal for other pumps, inputting a given signal and an actual signal to be connected with a comparison link, inputting an error signal output by the comparison link into the first pump regulator, outputting the frequency signal required by the first pump regulator, connecting the frequency signal with a frequency converter of the first pump, controlling the output of the frequency converter to change the rotating speed of the No. 1 water pump, causing the change of the flow rate and the pressure difference of the pipe network or the change of the temperature difference, causing the change of the actual signal, connecting the actual signal with the comparison link to form negative feedback, adopting feedback control for the first pump control, wherein the controlled quantity is the rotating speed of a circulating pump, and the manipulated quantity is the frequency of the frequency converter;
the first pump regulator is used for regulating frequency, pressure difference, temperature difference or flow, has different parameters for different regulating objects, and has the following regulating algorithm:
when T = T1, f1= fk1+ k1m ^ a + k2 Σ m when T ≠ T1, f1= f1 when m < ± b, f1= f 1;
where f1 is the pump inverter frequency number two; m is the difference between the given signal and the actual signal; fk1 is the average of the frequencies of the first 24 hours of inverter operation; k1 is an empirical coefficient, and the value range is 0.1-10; k2 is an empirical coefficient, and the value range is 0.1-2; a is an index coefficient, and the value range is 1-2; b is an empirical coefficient, and the value range is 0.1-1; t1 is the control period; the given amount may be: an external frequency signal, an external differential pressure signal, an external flow signal, or an external differential temperature signal; the actual signal as feedback can be the actual frequency of a frequency converter, the pressure difference of a pipe network, the flow of the pipe network or the temperature difference of the pipe network;
(2) the second pump control method is as follows: the second pump regulator outputs a frequency fine-tuning signal to make the motor current of the second pump follow the current of the first pump motor and be consistent with the pump output force of the first pump, the error signal of the current signal from the first pump motor and the current signal from the second pump motor are compared in a comparison link and then input into the second pump regulator, the second pump regulator outputs the frequency fine-tuning signal, the first pump frequency signal and the output frequency fine-tuning signal are compared in the comparison link and then output into the second pump frequency converter, the second pump frequency signal is output into the second pump frequency converter, the output of the second pump frequency converter is controlled to change the rotating speed of the second pump, the second pump motor current signal is the feedback signal of the second pump regulator, the frequency change of the second pump frequency converter is controlled to further cause the current signal change of the second pump motor, and the current of the second pump motor is equal to the current of the first pump motor, ensuring that the output of the second pump is the same as the output of the first pump, namely when the current of the second pump is greater than that of the first pump, indicating that the load of the second pump is increased, reducing the frequency of a frequency converter of the second pump, reducing the rotating speed of the second pump and reducing the load of the second pump;
the second pump regulation algorithm is as follows:
when T = T2, f2= fk2+ k3n ^ c + k4 Σ n; when T ≠ T2, f2= f 2; when n < ± d, f2= f 2;
where f2 is the pump inverter frequency number two; n is the difference between the first pump motor current and the second pump motor current; fk2 is the average of the frequencies of the first 24 hours of inverter operation; k3 is an empirical coefficient, and the value range is 0.1-5; k4 is an empirical coefficient, and the value range is 0.1-3; c is an index coefficient, and the value range is 1-3; d is an empirical coefficient, the value range is 0.1-2, and T2 is a control period;
the frequency fine tuning signal output by the second pump regulator is used for modifying the frequency of the second pump frequency converter, so that the motor current of the second pump follows the current of the first pump motor and keeps consistent with the pumping force of the first pump;
in order to ensure the safety of the pipe network, the upper and lower limits of the operating frequency of each circulating pump are correctly set, namely the pipe network is not overpressured when the double pumps operate; current parameters of each circulating pump are also required to be correctly set, so that no overcurrent is caused when a single circulating pump operates;
s3: according to the principle, a plurality of pumps can be expanded and used simultaneously;
s4: in order to avoid the occurrence of unstable hydraulic working conditions among a plurality of circulating pumps, a frequency tracking technology is adopted, namely, a plurality of pumps run, wherein one pump is a main pump, and the other pumps are auxiliary pumps to track the operation of the other pump; meanwhile, a current comparison technology is adopted, when the difference between the motor current of the auxiliary pump and the motor current of the main pump is too large, a fine adjustment frequency signal is output, the operating frequency of the auxiliary pump is modified, the multi-pump system can operate stably, and the parameters of the regulator are set on the touch screen according to the difference of control objects.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (6)
1. A heating and ventilation air-conditioning pipe network circulating pump water system is characterized by comprising a circulating pump, an electric ball valve and a circulating pump electricity-saving controller, wherein a primary side water supply pipe is connected with a heat exchanger, the heat exchanger is connected with a water supply pipe, a water supply pressure sensor and a water supply temperature signal interface are connected on the water supply pipe, a heat user is connected at the tail end of the water supply pipe, the heat user is connected with a water return pipe, a water return temperature signal interface, a water return pressure sensor and a flow meter are connected on the water return pipe, the water return pipe is connected with a first pump water inlet pipe and a second pump water inlet pipe, the first pump water inlet pipe is connected with a first pump inlet manual ball valve, a soft joint second pump, a soft joint third pump, a first pump outlet electric ball valve and a first pump water outlet pipe, the second pump water inlet pipe is connected with a second pump inlet manual ball valve, the soft joint first pump, the second pump, the soft joint fourth pump outlet electric ball valve and a second pump water outlet pipe, the first pump water outlet pipe and the second pump water outlet pipe are connected with the water return pipe, the tail end of the water return pipe is connected with a heat exchanger, and the heat exchanger is connected with a primary side water return pipe;
the circulating pump power-saving controller is internally provided with an external frequency input interface, an external pressure difference input interface, an external flow input interface, a touch screen, an analog quantity interface of the controller, a modulus output interface of the controller, a digital quantity output interface of the controller, a flow meter interface of the controller, an RS485 interface of the controller, a touch screen interface and an external temperature difference signal interface, and is also provided with a corresponding regulator;
the energy-saving operation method of the heating ventilation air-conditioning pipe network circulating pump water system comprises the following steps:
s1: before the circulating pump is started, the electric ball valve is closed; after the circulating pump is started, the electric ball valve is started; before stopping the pump, the electric ball valve is closed firstly;
s2: the circulating pump system with one use and one standby enables the two circulating pumps to simultaneously run at the same frequency;
(1) the first pump control method comprises the following steps: the first pump regulator is used for ensuring the running parameters of a pipe network, outputting a frequency signal required by the first pump, providing a following frequency signal for other pumps, inputting a given signal and an actual signal to be connected with a comparison link, inputting an error signal output by the comparison link into the first pump regulator, outputting the frequency signal required by the first pump regulator, connecting the frequency signal with a frequency converter of the first pump, controlling the output of the frequency converter to change the rotating speed of the first pump, causing the flow rate and the pressure difference of the pipe network to change or the temperature difference to change, causing the actual signal to change, connecting the actual signal with the comparison link to form negative feedback, controlling the first pump by adopting feedback control, wherein the controlled quantity is the rotating speed of a circulating pump, and the manipulated quantity is the frequency of the frequency converter;
the first pump regulator is used for regulating frequency, pressure difference, temperature difference or flow, has different parameters for different regulating objects, and has the following regulating algorithm:
when T is T1, f1 is fk1+ k1m a + k2 Σ m; when T ≠ T1, f1 does not change; when-b < m < + b, f1 does not change;
where f1 is the pump inverter frequency; m is the difference between the given signal and the actual signal; fk1 is the average of the frequencies of the first 24 hours of inverter operation; k1, k2 are empirical coefficients, a is an exponential coefficient, b is an empirical coefficient; t1 is the control period; the given quantities are: an external frequency signal, an external differential pressure signal, an external flow signal, or an external differential temperature signal; the actual signal as feedback is the actual frequency of the frequency converter, the pressure difference of the pipe network, the flow of the pipe network or the temperature difference of the pipe network;
(2) the second pump control method is as follows: the second pump regulator outputs a frequency fine-tuning signal to make the motor current of the second pump follow the current of the first pump motor and be consistent with the pump output force of the first pump, the error signal of the current signal from the first pump motor and the current signal from the second pump motor are compared in a comparison link and then input into the second pump regulator, the second pump regulator outputs the frequency fine-tuning signal, the first pump frequency signal and the output frequency fine-tuning signal are compared in the comparison link and then output into the second pump frequency converter, the second pump frequency signal is output into the second pump frequency converter, the output of the second pump frequency converter is controlled to change the rotating speed of the second pump, the second pump motor current signal is the feedback signal of the second pump regulator, the frequency change of the second pump frequency converter is controlled to further cause the current signal change of the second pump motor, and the current of the second pump motor is equal to the current of the first pump motor, ensuring that the output of the second pump is the same as the output of the first pump, namely when the current of the second pump is greater than that of the first pump, indicating that the load of the second pump is increased, reducing the frequency of a frequency converter of the second pump, reducing the rotating speed of the second pump and reducing the load of the second pump;
the second pump regulation algorithm is as follows:
when T is T2, f2 is fk2+ k3n ^ c + k4 ∑ n; when T ≠ T2, f2 does not change; when-d < n < + d, f2 does not change;
where f2 is the pump inverter frequency number two; n is the difference between the first pump motor current and the second pump motor current; fk2 is the average of the frequencies of the first 24 hours of inverter operation; k3, k4 are empirical coefficients, c is an exponential coefficient, d is an empirical coefficient, and T2 is a control period;
the frequency fine tuning signal output by the second pump regulator is used for modifying the frequency of the second pump frequency converter, so that the motor current of the second pump follows the current of the first pump motor and keeps consistent with the pumping force of the first pump;
in order to ensure the safety of the pipe network, the upper and lower limits of the operating frequency of each circulating pump are correctly set, namely the pipe network is not overpressured when the double pumps operate; current parameters of each circulating pump are also required to be correctly set, so that no overcurrent is caused when a single circulating pump operates;
s3: according to the principle, a plurality of pumps can be expanded and used simultaneously;
s4: in order to avoid the occurrence of unstable hydraulic working conditions among a plurality of circulating pumps, a frequency tracking technology is adopted, namely, a plurality of pumps run, wherein one pump is a main pump, and the other pumps are auxiliary pumps to track the operation of the other pump; meanwhile, a current comparison technology is adopted, when the difference between the motor current of the auxiliary pump and the motor current of the main pump is too large, a fine adjustment frequency signal is output, the operating frequency of the auxiliary pump is modified, the multi-pump system can operate stably, and the parameters of the regulator are set on the touch screen according to the difference of control objects.
2. The hvac pipe network circulating pump water system of claim 1, wherein multiple pumps can be extended.
3. An electricity-saving operation method for a heating, ventilating and air conditioning pipe network circulating pump water system according to any one of claims 1-2, comprising the following steps:
s1: before the circulating pump is started, the electric ball valve is closed; after the circulating pump is started, the electric ball valve is started; before stopping the pump, the electric ball valve is closed firstly;
s2: the circulating pump system with one use and one standby enables the two circulating pumps to simultaneously run at the same frequency;
(1) the first pump control method comprises the following steps: the first pump regulator is used for ensuring the running parameters of a pipe network, outputting a frequency signal required by the first pump, providing a following frequency signal for other pumps, inputting a given signal and an actual signal to be connected with a comparison link, inputting an error signal output by the comparison link into the first pump regulator, outputting the frequency signal required by the first pump regulator, connecting the frequency signal with a frequency converter of the first pump, controlling the output of the frequency converter to change the rotating speed of the first pump, causing the flow rate and the pressure difference of the pipe network to change or the temperature difference to change, causing the actual signal to change, connecting the actual signal with the comparison link to form negative feedback, controlling the first pump by adopting feedback control, wherein the controlled quantity is the rotating speed of a circulating pump, and the manipulated quantity is the frequency of the frequency converter;
the first pump regulator is used for regulating frequency, pressure difference, temperature difference or flow, has different parameters for different regulating objects, and has the following regulating algorithm:
when T is T1, f1 is fk1+ k1m a + k2 Σ m; when T ≠ T1, f1 does not change; when-b < m < + b, f1 does not change;
where f1 is the pump inverter frequency; m is the difference between the given signal and the actual signal; fk1 is the average of the frequencies of the first 24 hours of inverter operation; k1, k2 are empirical coefficients, a is an exponential coefficient, b is an empirical coefficient; t1 is the control period; the given quantities are: an external frequency signal, an external differential pressure signal, an external flow signal, or an external differential temperature signal; the actual signal as feedback is the actual frequency of the frequency converter, the pressure difference of the pipe network, the flow of the pipe network or the temperature difference of the pipe network;
(2) the second pump control method is as follows: the second pump regulator outputs a frequency fine-tuning signal to make the motor current of the second pump follow the current of the first pump motor and be consistent with the pump output force of the first pump, the error signal of the current signal from the first pump motor and the current signal from the second pump motor are compared in a comparison link and then input into the second pump regulator, the second pump regulator outputs the frequency fine-tuning signal, the first pump frequency signal and the output frequency fine-tuning signal are compared in the comparison link and then output into the second pump frequency converter, the second pump frequency signal is output into the second pump frequency converter, the output of the second pump frequency converter is controlled to change the rotating speed of the second pump, the second pump motor current signal is the feedback signal of the second pump regulator, the frequency change of the second pump frequency converter is controlled to further cause the current signal change of the second pump motor, and the current of the second pump motor is equal to the current of the first pump motor, ensuring that the output of the second pump is the same as the output of the first pump, namely when the current of the second pump is greater than that of the first pump, indicating that the load of the second pump is increased, reducing the frequency of a frequency converter of the second pump, reducing the rotating speed of the second pump and reducing the load of the second pump;
the second pump regulation algorithm is as follows:
when T is T2, f2 is fk2+ k3n ^ c + k4 ∑ n; when T ≠ T2, f2 does not change; when-d < n < + d, f2 does not change;
where f2 is the pump inverter frequency number two; n is the difference between the first pump motor current and the second pump motor current; fk2 is the average of the frequencies of the first 24 hours of inverter operation; k3, k4 are empirical coefficients, c is an exponential coefficient, d is an empirical coefficient, and T2 is a control period;
the frequency fine tuning signal output by the second pump regulator is used for modifying the frequency of the second pump frequency converter, so that the motor current of the second pump follows the current of the first pump motor and keeps consistent with the pumping force of the first pump;
in order to ensure the safety of the pipe network, the upper and lower limits of the operating frequency of each circulating pump are correctly set, namely the pipe network is not overpressured when the double pumps operate; current parameters of each circulating pump are also required to be correctly set, so that no overcurrent is caused when a single circulating pump operates;
s3: according to the principle, a plurality of pumps can be expanded and used simultaneously;
s4: in order to avoid the occurrence of unstable hydraulic working conditions among a plurality of circulating pumps, a frequency tracking technology is adopted, namely, a plurality of pumps run, wherein one pump is a main pump, and the other pumps are auxiliary pumps to track the operation of the other pump; meanwhile, a current comparison technology is adopted, when the difference between the motor current of the auxiliary pump and the motor current of the main pump is too large, a fine adjustment frequency signal is output, the operating frequency of the auxiliary pump is modified, the multi-pump system can operate stably, and the parameters of the regulator are set on the touch screen according to the difference of control objects.
4. The method as claimed in claim 3, wherein the controlled object is selected from the group consisting of circulation pump frequency, pipe network pressure difference, pipe network flow rate, and pipe network temperature difference, and the touch screen is configured with parameters of the regulator according to the control object.
5. The heating ventilation air-conditioning pipe network circulating pump water system electricity-saving operation method as claimed in claim 3, wherein the value range of k1 is 0.1-10; the value range of k2 is 0.1-2; the value range of a is 1-2; the value range of b is 0.1-1.
6. The heating ventilation air-conditioning pipe network circulating pump water system electricity-saving operation method as claimed in claim 3, wherein the value range of k3 is 0.1-5; the value range of k4 is 0.1-3; the value range of c is 1-3; the value range of d is 0.1-2.
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