CN210463383U - Frequency controller of multi-branch air conditioner cold and heat source two-stage water pump control system - Google Patents
Frequency controller of multi-branch air conditioner cold and heat source two-stage water pump control system Download PDFInfo
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- CN210463383U CN210463383U CN201921170864.2U CN201921170864U CN210463383U CN 210463383 U CN210463383 U CN 210463383U CN 201921170864 U CN201921170864 U CN 201921170864U CN 210463383 U CN210463383 U CN 210463383U
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- 230000000630 rising effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 description 5
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Abstract
The utility model relates to a frequency controller of a multi-branch air conditioner cold and heat source secondary water pump control system, wherein the output of a secondary water pump is connected with a plurality of branches, the tail part of each branch is provided with a differential pressure controller and a tail bypass valve, the differential pressure controller is connected with the tail bypass valve, and the tail bypass valve is connected with the secondary water pump through the frequency controller; the tail pressure difference of each branch is completed by automatically controlling the opening of the corresponding branch tail bypass valve through the corresponding branch pressure difference controller, and when the opening of the tail bypass valve is fully closed or the opening of the tail bypass valve is too large, the frequency controller is required to adjust the frequency set value of the secondary water pump. The utility model has the advantages that: the pressure or differential pressure of the most unfavorable branch can meet the requirements, so that the cold and hot water flow of the most unfavorable branch can meet the requirements of cold and hot loads; in addition, the pressure or differential pressure fluctuation of each branch is small, so that the stability of the system is ensured; the rotating speed of the secondary water pump is reduced as much as possible, and energy is saved to the maximum extent.
Description
Technical Field
The utility model belongs to the technical field of air conditioner control, especially, relate to a frequency controller of cold and hot source second grade water pump control system of a plurality of branch road air conditioners.
Background
The cold source or the heat source of the air conditioner is provided with cold water or hot water for the tail end of the air conditioner by a secondary water pump, the tail end of the air conditioner provides cold energy of the cold water or heat energy of the hot water for a room by direct radiation or a coil pipe and the like so as to achieve the effect of adjusting the temperature of the room, one air conditioner system is provided with a plurality of air conditioner tail ends, each air conditioner tail end is provided with a water valve for controlling the cold water or the hot water to enter the air conditioner tail end, the opening, the closing or the opening of the water valve is controlled by an air conditioner tail end controller according to the temperature difference value of the room, a common set of air conditioner system secondary water pump (1) outputs a plurality of branches, each branch is provided with a plurality of air conditioner tail ends 2, the flow of the cold water or the hot water is dynamically changed by the opening, the closing or the opening of each air conditioner tail end water valve in the work, the stabilization of pressure or differential pressure is realized by adjusting the opening degree of an adjusting valve 5 at the two ways of an outlet of an pump or a bypass valve 6 at the outlet of the pump for the constant-speed motor driven pump 1, the power supply frequency of the motor needs to be adjusted for the water pump 1 driven by a frequency converter, a controlled pressure or differential pressure feedback signal comes from a pressure or differential pressure sensor 4 arranged at the tail part of a most unfavorable branch 3, and the water resistance of each branch is inconsistent due to different pipe diameters or paths of each branch, so that the pressure or differential pressure at the tail part of each branch is inconsistent, the branch with the smallest pressure or differential pressure is the most unfavorable branch, the pressure or differential pressure of the branch is met, the pressure or differential pressure value values of other branches can be met, and the schematic diagram of a differential pressure system controlled according to the most unfavorable branch is shown. The pressure or differential pressure of the branch with the least disadvantage is adjusted according to the branch with the least disadvantage, the pressure or differential pressure of other branches except the branch with the most disadvantage has higher value than the branch with the least disadvantage, the value is satisfied, but because of no stabilizing measure, the water supply to each air conditioner end on the branch is unstable, and the energy waste is caused.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a cold and hot source second grade water pump control system's of a plurality of branch road air conditioners frequency controller.
The utility model adopts the technical proposal that: the frequency controller of the secondary water pump control system of the cold and heat source of the multi-branch air conditioner is characterized in that the output of the secondary water pump is connected with a plurality of branches, the tail of each branch is provided with a differential pressure controller and a tail bypass valve, the differential pressure controller is connected with the tail bypass valve, and the tail bypass valve is connected with the secondary water pump through the frequency controller.
Preferably, the frequency controller comprises a filter, a minimum selector, a maximum selector, an up logic, a down logic, an up logic enabler, a down logic enabler and a frequency setter, the minimum selector and the maximum selector are both connected with the filter, the up logic and the down logic are both connected with the frequency setter, and the up logic enabler and the down logic enabler are arranged between the up logic and the down logic.
Preferably, the opening of the tail bypass valve is provided with four thresholds, namely a frequency rising threshold, a frequency rising stopping threshold, a frequency falling stopping threshold and a frequency falling threshold from low to high.
Preferably, the tail part of the branch is also provided with a differential pressure sensor, and the differential pressure sensor is connected with a differential pressure controller.
Preferably, the secondary water pump is driven by a frequency converter.
Preferably, the frequency setter can be selected automatically or set manually.
The utility model has the advantages and positive effects that: the pressure or differential pressure of the most unfavorable branch can meet the requirements, so that the cold and hot water flow of the most unfavorable branch can meet the requirements of cold and hot loads; in addition, the pressure or differential pressure fluctuation of each branch is small, so that the stability of the system is ensured; the rotating speed of the water pump is enabled to be as small as possible, and energy is saved to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of system differential pressure control with the most unfavorable branch;
fig. 2 is a schematic view of a control system according to an embodiment of the present invention;
fig. 3 is a schematic view of a tail bypass valve opening threshold according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the internal logic of the frequency controller according to an embodiment of the present invention.
In the figure:
1-two-stage water pump 2-air conditioner tail end 3-branch
4-differential pressure sensor 5-two-way regulating valve 6-pump outlet bypass valve
7-water distribution pipe 8-water collection pipe 9-tail bypass valve
10-differential pressure controller 20-frequency controller 21-bypass valve opening
22-branch cut 23-boost threshold 24-stop boost threshold
25-stop down threshold 26-down threshold 27 auto-select
28 manual setting 29-frequency setting 30-filter
31-minimum selector 32-maximum selector 33-up-conversion logic
34-Down frequency logic 35-Up frequency logic Enabler 36-Down frequency logic Enabler
37-frequency setter 40-filtered bypass valve opening 41-minimum valve opening
42-maximum valve opening 43-ascending frequency logic signal 44-descending frequency logic signal
45-Up Enable logic Signal 46-Down Enable logic Signal
Detailed Description
An embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 2, the utility model relates to a frequency controller of cold and hot source second grade water pump control system of a plurality of branch road air conditioners, for improving control characteristic, second grade water pump 1 adopts the converter drive, sets up differential pressure sensor 4 and sets up bypass valve 9 at the afterbody at every branch road afterbody. Specifically, a plurality of branches 3 are connected to the output of a secondary water pump 1, each branch 3 is provided with a plurality of air conditioner terminals 2, the tail of each branch 3 is provided with a differential pressure controller 10 and a tail bypass valve 9, the differential pressure controller 10 is used for controlling the tail differential pressure of the branch, the tail of the branch is also provided with a differential pressure sensor 4, differential pressure feedback is obtained from the tail differential pressure sensor 4, and the output of the differential pressure controller 10 controls the tail bypass valve 9, so that the actual value of the tail differential pressure of the branch 3 tracks a set value; the differential pressure set value of the differential pressure controller 10 is confirmed in the system debugging stage, and the set value is kept unchanged after the system normally operates; the principle of the differential pressure set value is that the load of each branch is a normal working condition, the differential pressure control arithmetic unit 10 is put into automation, and the differential pressure set value of each branch is adjusted after the system is stabilized, so that the opening degree of a bypass valve at the tail of each branch is close to that of the bypass valve; the tail bypass valve 9 is connected with the second-stage water pump 1 through a frequency controller, and the second-stage water pump 1 is driven by a frequency converter. As shown in fig. 3, the opening of the tail bypass valve 9 has four thresholds, namely, a raising threshold 23, a stop raising threshold 24, a stop lowering threshold 25, and a lowering threshold 26 from low to high.
As shown in fig. 4, the frequency controller includes a filter 30, a minimum selector 31, a maximum selector 32, an up logic 33, a down logic 34, an up logic enabler 35, a down logic enabler 36, and a frequency setter 37, wherein the minimum selector 31 and the maximum selector 32 are connected to the filter 30, the up logic 33 and the down logic 34 are connected to the frequency setter 37, and the up logic enabler 35 and the down logic enabler 36 are disposed between the up logic 33 and the down logic 34.
The filter 30: filtering the opening of the bypass valve of each branch, keeping the stability of the operation of the controller, and forming a filtered opening 40 of the bypass valve by the opening 21 of the bypass valve through a filter;
minimum value selector 31: comparing the valve opening of each branch after filtering to select the minimum value for output, wherein the valve opening of the branch cut 22 does not participate in selection;
maximum value selector 32: comparing the valve opening of each branch after filtering to select the maximum value for output, wherein the valve opening of the branch cut 22 does not participate in selection;
the up-conversion logic 33: if the minimum valve opening 41 output by the input minimum value selector 31 is smaller than the value of the frequency increasing threshold 23, the output frequency increasing logic signal 43 is at a high level and is sent to the frequency setter 37 for setting the increasing of the frequency 29, and when the valve opening is higher than the value of the frequency increasing stopping threshold 24, the output frequency increasing logic signal 43 is at a low level, so that the frequency increasing output by the frequency setter (37) is stopped, and the frequency increasing enabling logic signal 45 works when the frequency increasing enabling logic signal 45 is at a high level;
the down-conversion logic 34: if the maximum valve opening 42 output by the input maximum selector 32 is greater than the down-conversion threshold 26, the down-conversion logic signal 44 is output as high level and sent to the frequency setter 37 for setting the reduction of the frequency 29, and when the valve opening is lower than the down-conversion stop threshold 25, the down-conversion logic signal 44 is output as low level, so that the down-conversion of the frequency setter 37 is stopped, and the down-conversion enable logic signal 46 is operated as high level;
up-conversion logic enabler 35: the down-conversion logic signal 44 is inverted and then logically anded with the automatic selection 27 to output an up-conversion enabling logic signal 45, and the up-conversion logic device 33 works when the up-conversion logic signal is at a high level;
down logic enabler 36: the up-conversion logic signal 43 is inverted and then logically anded with the automatic selection 27 to output a down-conversion enabling logic signal 46, and the down-conversion logic 34 works when the level is high;
frequency setter 37: when the auto-select signal 27 is at a high level, if the up-conversion logic signal 43 is at a high level, the frequency set value 29 rises at a certain time slope, and if the up-conversion logic signal 43 becomes at a low level, the frequency set value 29 stops rising and is maintained at the current value; when the auto-select signal 27 is high, if the down-conversion logic signal 44 is high, the frequency setting 29 will drop according to a certain time slope, if the down-conversion logic signal 44 changes to low level, the frequency setting 29 will drop and stop, and will be kept at the current value; when the auto select signal 27 is low, the frequency setpoint 29 tracks the manual setpoint 28. The frequency setter 37 can be automatically selected or manually set.
The modules can adopt conventional models in other existing circuits, and the maximum value selector and the minimum value selector can adopt a set selection mode and a data selector.
The good cold and heat source secondary system with a plurality of branches has the following control requirements: 1) the pressure or differential pressure of the most unfavorable branch can meet the requirements, so that the cold and hot water flow of the most unfavorable branch can meet the requirements of cold and hot loads; 2) The pressure or differential pressure of each branch cannot fluctuate too much, so that the system is stable; 3) on the basis of meeting the two requirements, the rotating speed of the water pump is as small as possible, so that the energy is saved to the maximum extent. In order to meet the above requirements, appropriate control is also required, and the specific control method is as follows:
step one, automatically controlling the opening degree of a corresponding branch tail bypass valve through a corresponding branch pressure difference controller to finish the tail pressure difference of each branch, executing step two when the opening degree of any tail bypass valve is fully closed, and executing step three when the opening degree of any tail bypass valve is overlarge;
step two, screening the minimum valve opening, when the minimum valve opening is lower than a frequency rising threshold, setting the frequency sent to a water pump frequency converter by a frequency setter to rise according to a set slope, and when the minimum valve opening is larger than a frequency rising stopping threshold, setting the frequency to stop rising;
step three, screening the maximum valve opening, when the maximum valve opening is higher than the frequency reduction threshold, the frequency setting sent to the water pump frequency converter by the frequency setter is lowered according to a set slope, and when the maximum valve opening is smaller than the frequency reduction stopping threshold, the frequency setting is lowered and stopped;
and C, performing branch cutting in advance before executing the second step and the third step, wherein the opening degree of the tail bypass valve in the first step is too large to exceed the frequency reduction threshold.
The inputs to the frequency controller 20 include the bypass valve opening 21, bypass cut 22, up threshold 23, stop up threshold 24, stop down threshold 25, down threshold 26, auto select 27, manual set point 28.
Bypass valve opening 21: the numerical value is a set value or an actual value of the opening degree of the tail bypass valve 9, and is one for each branch.
Branch cutting 22: switching value, cutting off branches 3 not participating in control, one for each branch.
Raising the frequency threshold 23: the value is set to a bypass valve opening value for raising the frequency of the inverter.
Stop raising threshold 24: the value is set to a bypass valve opening value at which the frequency of the inverter stops increasing.
Stop-down threshold 25: the value is set to a bypass valve opening value for stopping the frequency of the inverter from decreasing.
Down threshold 26: the value is set to a bypass valve opening value for reducing the frequency of the inverter.
Automatic selection 27: the controller is in an automatic state when the switching value is 1, and in a manual state when the switching value is 0.
Manual set point 28: when the controller is in a manual state, the output frequency set value is output according to the value.
The output of the frequency controller is a frequency set value 29, and the numerical value is sent to the secondary water pump driving frequency converter and used for controlling the rotating speed of the secondary water pump.
This embodiment will be further described with reference to specific examples.
Example (b):
the frequency controller of the multi-branch air conditioner cold and heat source secondary water pump control system is characterized in that the output of a secondary water pump 1 is connected with a plurality of branches 3, the tail of each branch 3 is provided with a pressure difference controller 10 and a tail bypass valve 9, the pressure difference controller 10 is connected with the tail bypass valve 9, the tail of each branch is also provided with a pressure difference sensor 4, the pressure difference sensor 4 is connected with the pressure difference controller 10, the tail bypass valve 9 is connected with the secondary water pump 1 through the frequency controller, and the secondary water pump 1 is driven by a frequency converter; the frequency controller comprises a filter 30, a minimum value selector 31, a maximum value selector 32, an up-conversion logic 33, a down-conversion logic 34, an up-conversion logic enabler 35, a down-conversion logic enabler 36 and a frequency setter 37, wherein the minimum value selector 31 and the maximum value selector 32 are connected with the filter 30, the up-conversion logic 33 and the down-conversion logic 34 are connected with the frequency setter 37, and the up-conversion logic enabler 35 and the down-conversion logic enabler 36 are arranged between the up-conversion logic 33 and the down-conversion logic 34; the opening degree of the tail bypass valve is provided with four threshold values, namely a frequency rising threshold 23, a frequency rising stopping threshold 24, a frequency falling stopping threshold 25 and a frequency falling threshold 26 from low to high.
As shown in fig. 2 and 4, the specific control method is as follows:
1. the frequency converter of the water pump 1 of the controller 20 of the utility model sends a frequency given 29 signal;
2. 4 threshold values are set for the opening degree of the tail bypass valve 9, and the opening degree is respectively from low to high as follows: a raising frequency threshold 23, a stopping raising frequency threshold 24, a stopping reducing frequency threshold 25 and a reducing frequency threshold 26, wherein the schematic diagram of the opening threshold of the tail bypass valve is shown in figure 3;
3. the normal branch tail differential pressure is completed by automatically controlling the opening degree of the bypass valve 9 by an external differential pressure controller 10;
4. when the opening of the tail bypass valve 9 is fully closed, the bypass valve 9 loses the control of the branch tail differential pressure, in order to ensure the stability of the branch tail differential pressure control, the opening of the tail bypass valve 9 with the minimum opening of each branch is lower than the frequency-raising threshold 23, the frequency given 29 sent to the frequency converter of the water pump 1 by the controller 20 rises according to the set slope, the frequency of the frequency converter of the water pump 1 is gradually raised, the running speed of the water pump 1 is raised, thus the tail differential pressure has the trend of raising, because the branch tail differential pressure is adjusted by the bypass valve 9, in order to keep the differential pressure stable, the external differential pressure controller 10 controls the opening of the tail bypass valve 9 to increase, and when the opening of the branch valve is larger than the frequency-raising threshold 24, the frequency setting 29.
5. When the opening of the bypass valve 9 is too large, the water flowing through the bypass valve 9 is too much, which wastes energy, and the frequency of the motor of the water pump 1 needs to be reduced, so that the opening of the valve 9 is smaller. When the opening of the tail bypass valve 9 with the largest opening is higher than the frequency reduction threshold 26, the controller 20 of the utility model sets the frequency setting 29 of the frequency converter of the water pump 1 to fall according to the set slope, gradually reduces the frequency of the frequency converter, and reduces the running speed of the water pump 1, so that the tail end differential pressure tends to fall, and because the tail differential pressure of the branch is adjusted by the bypass valve 9, the external differential pressure controller 10 controls the opening of the tail bypass valve 9 to reduce for keeping the differential pressure stable, and when the opening of the branch valve is lower than the frequency reduction stop threshold 25, the frequency setting 29 falls and stops.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (5)
1. The frequency controller of the cold and heat source secondary water pump control system of the air conditioner with a plurality of branches is connected with the secondary water pump output, and the frequency controller is characterized in that: the tail part of each branch is provided with a pressure difference controller and a tail bypass valve, the pressure difference controller is connected with the tail bypass valve, and the tail bypass valve is connected with the secondary water pump through a frequency controller;
the frequency controller comprises a filter, a minimum value selector, a maximum value selector, an up-conversion logic device, a down-conversion logic device, an up-conversion logic enabler, a down-conversion logic enabler and a frequency setter, wherein the minimum value selector and the maximum value selector are both connected with the filter, the up-conversion logic device and the down-conversion logic device are both connected with the frequency setter, and the up-conversion logic enabler and the down-conversion logic enabler are arranged between the up-conversion logic device and the down-conversion logic device.
2. The frequency controller of the multi-branch air conditioner cold and heat source two-stage water pump control system according to claim 1, wherein: the opening degree of the tail bypass valve is provided with four threshold values which are respectively a frequency rising threshold, a frequency rising stopping threshold, a frequency falling stopping threshold and a frequency falling threshold from low to high.
3. The frequency controller of the multi-branch air conditioner cold and heat source two-stage water pump control system according to claim 2, wherein: and the tail part of the branch is also provided with a differential pressure sensor which is connected with the differential pressure controller.
4. The frequency controller of the multi-branch air conditioner cold and heat source two-stage water pump control system according to claim 3, wherein: the secondary water pump is driven by a frequency converter.
5. The frequency controller of the multi-branch air conditioner cold and heat source two-stage water pump control system according to claim 4, wherein: the frequency setter can be selected automatically or set manually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921170864.2U CN210463383U (en) | 2019-07-24 | 2019-07-24 | Frequency controller of multi-branch air conditioner cold and heat source two-stage water pump control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921170864.2U CN210463383U (en) | 2019-07-24 | 2019-07-24 | Frequency controller of multi-branch air conditioner cold and heat source two-stage water pump control system |
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| Publication Number | Publication Date |
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| CN210463383U true CN210463383U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921170864.2U Withdrawn - After Issue CN210463383U (en) | 2019-07-24 | 2019-07-24 | Frequency controller of multi-branch air conditioner cold and heat source two-stage water pump control system |
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| CN (1) | CN210463383U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388708A (en) * | 2019-07-24 | 2019-10-29 | 中冶天工集团有限公司 | A kind of frequency controller for the air conditioner cold-heat source second level control system of water pump with multiple branches |
| CN112432269A (en) * | 2020-11-27 | 2021-03-02 | 上海碳索能源服务股份有限公司 | Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room |
-
2019
- 2019-07-24 CN CN201921170864.2U patent/CN210463383U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388708A (en) * | 2019-07-24 | 2019-10-29 | 中冶天工集团有限公司 | A kind of frequency controller for the air conditioner cold-heat source second level control system of water pump with multiple branches |
| CN110388708B (en) * | 2019-07-24 | 2024-02-06 | 中冶天工集团有限公司 | Frequency controller of air conditioner cold and heat source two-stage water pump control system |
| CN112432269A (en) * | 2020-11-27 | 2021-03-02 | 上海碳索能源服务股份有限公司 | Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room |
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