A fan variable frequency energy-saving system

Abstract

The utility model relates to a kind of fan frequency conversion energy-saving system, the valve piece opening of most unfavorable branch is measured by at least the wind control unit being set on most unfavorable branch, and according to the valve piece opening of most unfavorable branch adjusts fan operating frequency, so that system meets fan under the most reasonable operating frequency operation at any time, while meeting ventilation demand, maximize reduce fan energy consumption, and system installation and debugging are convenient, reduce the over-high requirement of technical personnel in construction and debugging process, save artificial management cost, improve management efficiency, and effectively reduce the present situation of on-site debugging difficulty.

Description

Technical Field

[0001] This utility model relates to the field of ventilation system technology, and in particular to a variable frequency energy-saving system for fans. Background Technology

[0002] In ventilation and air conditioning systems, the airflow in a room is regulated by terminal air valves. During operation, this often results in high energy consumption and noise levels. During the initial operation phase, the fan must maintain a high residual pressure to overcome the gradual increase in system resistance. That is, as the air filters in the ventilation and air conditioning system gradually become clogged (dirty), the regulating valves in each branch automatically and gradually increase their valve openings to reduce resistance and maintain a resistance balance and constant airflow in the ventilation and air conditioning system. While this avoids the airflow imbalance caused by regulating valves and the need for repeated manual adjustments, the fan operates at a consistently high residual pressure, wasting significant energy and potentially causing the actual airflow to exceed user demand, resulting in unnecessary waste and generating considerable noise. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects in the prior art, thereby providing a variable frequency energy-saving system for wind turbines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A variable frequency energy-saving system for a fan includes a fan, a main pipeline, several branch pipelines, air valves, and a controller;

[0006] One end of the main pipeline is connected to the fan, and the other end is connected to several branch pipelines;

[0007] One end of the branch is connected to the main pipeline, and the other end is connected to the room. The branch includes the most unfavorable branch. Several of the branches are equipped with the air valve. The air valve includes at least an air control unit. The air control unit is at least located at the end of the most unfavorable branch. The air control unit is used to detect the opening degree of the valve plate in the branch.

[0008] The fan is equipped with a frequency converter to adjust or maintain the operating frequency;

[0009] The controller is electrically connected to the air control unit and the frequency converter.

[0010] Furthermore, the wind control unit is provided at the end of each of the branch roads.

[0011] Furthermore, the air valve installed on the most unfavorable branch is an air control unit, while the air valves installed at the ends of the other branches are constant air volume valves.

[0012] Furthermore, the air valve installed on the most unfavorable branch is an air control unit, while the air valves installed at the ends of the other branches are manual valves.

[0013] Furthermore, it also includes a filter, which is disposed at the air outlet of the fan.

[0014] Furthermore, it also includes an air measurement module, which is installed in the main pipeline and is used to measure the air volume and total pressure of the main pipeline;

[0015] The wind measurement module is electrically connected to the controller.

[0016] Furthermore, the air control unit includes a measuring device, a control device, and an execution device. The measuring device is used to measure the air volume and valve opening of the branch. The execution device is used to control the valve opening of the air control unit. The control device is electrically connected to the measuring device and the execution device.

[0017] The control device is electrically connected to the controller.

[0018] Furthermore, it also includes an alarm device for receiving alarm commands from the controller and sending an alarm signal.

[0019] Furthermore, it also includes a control panel, to which the controller is electrically connected.

[0020] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0021] This utility model relates to a variable frequency energy-saving system for fans. By setting a control unit at least on the most unfavorable branch, the system measures the valve opening of the most unfavorable branch and adjusts the fan operating frequency according to the valve opening of the most unfavorable branch. This ensures that the system always allows the fan to operate at the most reasonable operating frequency, maximizing the reduction of fan energy consumption while meeting ventilation requirements. The system is also easy to install and debug, reducing the excessive requirements on technical personnel during construction and debugging, saving labor management costs, improving management efficiency, and effectively reducing the current difficulties in on-site debugging. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the structure of a variable frequency energy-saving system for a fan provided in one embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a fan frequency conversion energy-saving system provided in another embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of a fan frequency conversion energy-saving system provided in another embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Fan; 11. Frequency converter;

[0028] 2. Main road;

[0029] 3. Branch road; 31. Most unfavorable branch road;

[0030] 4. Air control unit; 5. Controller; 6. Constant air volume valve; 7. Manual valve; 8. Control panel; 9. Air measurement module. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] As attached Figure 1 As shown, this utility model provides a variable frequency energy-saving system for a fan, including a fan 1, a main pipeline 2, several branch pipelines 3, air valves, and a controller 5; one end of the main pipeline 2 is connected to the fan 1, and the other end is connected to several branch pipelines 3; one end of each branch pipeline 3 is connected to the main pipeline 2, and the other end is connected to the indoor environment; each branch pipeline 3 includes the most unfavorable branch 31; several branch pipelines 3 are equipped with air valves, and each air valve includes at least an air control unit 4; the air control unit 4 is at least located at the end of the most unfavorable branch 31, and the air control unit 4 is used to detect the opening degree of the valve plate in the branch; the fan 1 is equipped with a frequency converter 11, which is used to adjust or maintain the operating frequency; the controller 5 is electrically connected to the air control unit 4 and the frequency converter 11 via a circuit. Specifically, the most unfavorable branch 31 can be defined in two ways. One method is to detect the valve opening of all branches 3 through the air control unit 4 and select one or more branches 3 with the largest valve opening as the most unfavorable branch 31. The other method is to identify one or more branches 3 with the largest cumulative resistance loss and friction loss based on pre-analysis and detection, and define them as the most unfavorable branch 31. Generally, the branch 3 farthest from the fan 1 is selected as the most unfavorable branch 31. In this application, the air control unit 4 is set on the most unfavorable branch to obtain the valve opening of the most unfavorable branch because when the fan 1 transmits air volume, the air will encounter energy loss due to friction and local resistance in the duct. The most unfavorable branch 31 has the largest accumulated resistance loss. Therefore, when the valve opening of the most unfavorable branch 31 can meet the actual air volume requirement, the other branches 3 will also be able to meet the actual air volume requirement.

[0035] Furthermore, the air control unit 4 can have the function of feedback of air volume value and valve opening degree, and can be selected to realize either air volume value control or valve opening degree control, or it can only have the function of feedback of valve opening degree. Variable air volume valves or other air valves on the market that can provide feedback of valve opening degree also belong to the air control unit 4 of this application. Even further, in this application, the main function of the air control unit 4 is to detect and provide feedback on the valve opening degree on the branch 3.

[0036] A control unit 4 is installed on the most unfavorable branch 31 to measure the valve opening of the most unfavorable branch 31. Specifically, there are several ways to implement the system. For example, each control unit 4 is connected to the controller 5 through a circuit, and a minimum and maximum electrical signal are manually set. The minimum electrical signal corresponds to the electrical signal when the valve opening of the most unfavorable branch 31 is the minimum value of the preset range, and the maximum electrical signal corresponds to the electrical signal when the valve opening of the most unfavorable branch 31 is the maximum value of the preset range. After long-term use, due to problems such as fan performance degradation or filter blockage, it is necessary to adjust the valve opening to keep the air volume of the branch constant. There is a certain correlation between the valve opening and the actual air volume. The larger the valve opening, the less resistance the airflow encounters through the valve, and the smaller the energy loss of the actual airflow. However, this may lead to the actual air volume exceeding the user's needs and causing unnecessary waste. On the other hand, the smaller the valve opening, the more resistance the airflow encounters through the valve, the greater the actual air volume loss, and the greater the fan energy consumption. Therefore, the valve opening needs to be set within a reasonable preset range so that it can be adjusted within this range to meet user needs while achieving energy saving. For example, the minimum value of the preset range is 90%, and the maximum value is 100%. When the minimum electrical signal is triggered, the system detects that the valve opening of the most unfavorable branch 31 is 90%, and when the maximum electrical signal is triggered, the system detects that the valve opening of the most unfavorable branch 31 is 100%. Furthermore, the controller 5 controls the operating frequency of the fan 1 based on the received minimum and maximum electrical signals. It is worth noting that the implementation of the system is not limited to the logic control of the circuit described above; other control methods or other circuit control logic can be used, which are not limited here.

[0037] This system ensures that fan 1 operates at the most reasonable operating frequency at all times, meeting ventilation requirements while minimizing the energy consumption of fan 1. The system is also easy to install and debug, reducing the excessive requirements on technical personnel during construction and debugging, and effectively reducing the difficulties of on-site debugging.

[0038] In some embodiments of this utility model, as shown in the appendix Figure 1As shown, the ventilation and air conditioning system is a variable air volume system. Except for the air valve at the end of the most unfavorable branch 31, which serves as the air control unit 4, several other branches 3 also have their own air control units 4 at their ends. That is, all the air valves on the branches are air control units 4. The air control unit 4 can intelligently detect the valve opening on any branch, and the controller 5 determines and selects the branch 3 with the largest valve opening as the most unfavorable branch 31. Specifically, each air control unit 4 can be connected to the controller 5 via a circuit. When the circuit emits the lowest electrical signal, the controller 5 controls the fan 1 to maintain its current operating frequency; when the circuit emits the highest electrical signal, the controller 5 controls and increases the operating frequency of the fan 1. The controller 5 controls the operating frequency of the fan 1 based on the received lowest and highest electrical signals, ensuring that each branch operates according to the corresponding indoor demand. This coordinates with the valve openings of the air valves connected to each branch 3 to always maintain a reasonable opening range, avoiding unnecessary energy consumption and thus improving the overall energy efficiency of the system.

[0039] In some embodiments of this utility model, as shown in the appendix Figure 2 As shown, the ventilation and air conditioning system is a constant air volume system. Only the damper installed on the most unfavorable branch 31 is a control unit 4, and the dampers installed at the ends of several branches 3 are constant air volume valves 6. Through preliminary calculations and analysis, the branch 3 farthest from the fan 1 is selected as the most unfavorable branch 31. Specifically, the most unfavorable branch 31 can be connected to the controller 5 via a circuit. When the circuit emits the lowest electrical signal, the controller 5 controls the fan 1 to maintain the current operating frequency. When the circuit emits the highest electrical signal, the controller 5 controls the fan 1 to increase its operating frequency. The controller 5 controls the operating frequency of the fan 1 based on the received lowest and highest electrical signals, causing the opening of the constant air volume valves 6 of the other branches 3 to change accordingly.

[0040] In some embodiments of this utility model, as shown in the appendix Figure 3 As shown, only the damper at the end of the most unfavorable branch 31 is a control unit 4, while the dampers at the ends of the other branches 3 are manual valves 7. Based on preliminary calculations and analysis, the branch 3 furthest from the fan 1 is defined as the most unfavorable branch 31. Specifically, the most unfavorable branch 31 can be connected to the controller 5 via a circuit. When the circuit emits the lowest electrical signal, the controller 5 controls the fan 1 to maintain its current operating frequency. When the circuit emits the highest electrical signal, the controller 5 controls the fan 1 to increase its operating frequency. The controller 5 controls the operating frequency of the fan 1 based on the received lowest and highest electrical signals, enabling the fan 1 to operate at the most energy-efficient frequency.

[0041] It is worth noting that the remaining branches 3 of the above three systems can also be partially equipped with air control units 4. The number of branches 3 equipped with air control units 4 can be set according to the actual use situation, and is not limited here.

[0042] In some embodiments of this utility model, the system also includes a filter, which is located at the air outlet of the fan 1. It is worth noting that when the filter is severely clogged, it will cause a pressure loss of at least 200-300 Pa, which increases the resistance of the ventilation and air conditioning system. This causes the fan 1 to increase its operating frequency in order to maintain the required air volume, which greatly increases energy consumption. Therefore, when the fan 1 has already run at its highest frequency and the valve plate of the most unfavorable branch 31 has been opened to the maximum, the filter needs to be replaced.

[0043] In some embodiments of this utility model, the system further includes an air measurement module 9, which is disposed within the main pipeline 2 and is communicatively connected to the controller 5. The air measurement module 9 is used to measure the air volume and total pressure values ​​in the main pipeline 2 at the outlet of the fan 1 in the ventilation and air conditioning system in real time, and sends the air volume and total pressure values ​​to the controller 5 to assist in the initial debugging of the system. Preferably, the specific structure of the air measurement module 9 in this application is the structure of the controller for measuring dynamic pressure, total pressure, and static pressure as disclosed in publication number CN220911626U. Of course, those skilled in the art can select and adjust it according to actual application conditions and product requirements, etc. The air measurement module 9 can also be replaced by any measuring device for measuring air volume and duct pressure, which is not limited here.

[0044] In some embodiments of this utility model, the air control unit 4 includes a measuring device, a control device, and an execution device. The measuring device is used to measure the air volume value and valve opening of the branch 3 in real time. The execution device is used to control the valve opening of the air control unit 4. The control device is electrically connected to the measuring device and the execution device. The control device is electrically connected to the controller 5 to obtain the valve opening of the air control unit 4 in real time, and adjust the fan 1 to operate at the most energy-efficient operating frequency based on this.

[0045] In some embodiments of this utility model, an alarm device is also included, which is used to receive alarm commands issued by the controller 5 and send an alarm signal. For example, when the maximum total air volume or maximum total pressure value of the main pipeline 2 is not met during the commissioning phase, the leakage volume obtained based on the sum of the air volume values ​​of each branch 3 exceeds the set value, or the air measurement module 9 or the air control unit 4 is faulty and cannot detect air volume data, the controller 5 issues an alarm command, the alarm device sounds an alarm, and the staff performs troubleshooting.

[0046] In some embodiments of this utility model, a control panel 8 is also included. The controller 5 is electrically connected to the control panel 8, so that the air volume and total pressure values ​​acquired by the wind measurement module 9, the valve opening degree of the branch 3 acquired by the wind control unit 4, and the operating frequency of the fan 1 are all displayed on the screen of the control panel 8. This allows users and maintenance personnel to directly control and observe the data through the control panel 8, thereby enabling them to quickly observe whether the system has any abnormalities. Preferably, the screen of the control panel 8 has debug and run buttons, allowing users or maintenance personnel to quickly switch to different modes of the system.

[0047] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A variable frequency energy-saving system for wind turbines, characterized in that, Includes a fan, main pipeline, several branch pipelines, air valves, and controllers; One end of the main pipeline is connected to the fan, and the other end is connected to several branch pipelines; One end of the branch is connected to the main pipeline, and the other end is connected to the room. The branch includes the most unfavorable branch. Several of the branches are equipped with the air valve. The air valve includes at least an air control unit. The air control unit is at least located at the end of the most unfavorable branch. The air control unit is used to detect the opening degree of the valve plate in the branch. The fan is equipped with a frequency converter to adjust or maintain the operating frequency; The controller is electrically connected to the air control unit and the frequency converter.

2. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, The air valves installed at the ends of several of the branch lines are all air control units.

3. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, The air valve installed on the most unfavorable branch is an air control unit, and the air valve installed at the end of the other branches is a constant air volume valve.

4. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, The air valve installed on the most unfavorable branch is a control unit, while the air valves installed at the ends of the other branches are manual valves.

5. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, It also includes a filter, which is disposed at the air outlet of the fan.

6. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, It also includes an air measurement module, which is installed in the main pipeline and is used to measure the air volume and total pressure of the main pipeline; The wind measurement module is electrically connected to the controller.

7. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, The air control unit includes a measuring device, a control device, and an execution device. The measuring device is used to measure the air volume and valve opening of the branch. The execution device is used to control the valve opening of the air control unit. The control device is electrically connected to the measuring device and the execution device. The control device is electrically connected to the controller.

8. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, It also includes an alarm device for receiving alarm commands from the controller and sending an alarm signal.

9. The wind turbine frequency conversion energy-saving system as described in claim 1, characterized in that, It also includes a control panel, and the controller is electrically connected to the control panel.

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