A variable air volume controller

Abstract

The utility model discloses a variable air volume controller belongs to the field of heating ventilation air conditioner controller, including the box, the left and right ends of box all are installed with the ear plate, install the control panel in the box, the rear side integrated setting of control panel has digital differential pressure inductive chip, the front side integrated setting of control panel has microprocessor, the main control board of this variable air volume controller integrated digital differential pressure inductive chip and signal interface component, need not additional configuration differential pressure sensor, the use program of multiple scenes is built -in in controller, and the user can select directly through touch -sensitive screen or host computer, need not programming again, and this controller program has fused the algorithm of differential pressure and air volume, supports through touch display screen or host computer and switches differential pressure mode or air volume mode, in addition, this air volume controller has embedded 4G and LORA communication module, has realized the high degree of integration, has effectively reduced the error rate and cost of secondary programming, has reduced the difficulty and expense of later period maintenance.

Description

Technical Field

[0001] This utility model relates to the field of HVAC controller technology, specifically a variable air volume controller. Background Technology

[0002] As the "core brain" of a variable air volume (VAV) system, the VAV controller undertakes the crucial functions of "collecting environmental parameters, calculating adjustment values, and driving actuators." Its performance directly determines the system's temperature control accuracy, energy efficiency, and operational stability. Current market demands for VAV controllers have shifted from "basic on / off control" to "multi-parameter integration, intelligent collaboration, and convenient operation." However, the structural and functional deficiencies of traditional controllers are gradually becoming bottlenecks restricting the release of VAV system performance.

[0003] The PLC controller collects data from the differential pressure sensor and compares it with the set differential pressure. Then, the PLC controller outputs a signal to control the opening of the damper actuator to adjust the air volume. Each project application requires reprogramming. If the air volume needs to be measured directly, an additional sensor is required. In addition, the controller communication only supports RS485 wired communication, so it cannot be used in some scenarios where wiring is not possible.

[0004] Therefore, this utility model provides a variable air volume controller to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved This invention provides a variable air volume controller, which aims to solve the problems mentioned in the background art.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a housing is included, with ear plates installed on both the left and right ends of the housing, a control board installed inside the housing, a digital differential pressure sensing chip integrated on the rear side of the control board, a microprocessor integrated on the front side of the control board, a 4G and LoRa communication module provided on the front side of the control board, and a signal interface component provided on the control board.

[0007] As a preferred technical solution of this application, the signal interface component includes a 4-20mA analog interface and a 0-10V analog interface. The 4-20mA analog interface is fixedly installed at the lower end of the control board, and the 0-10V analog interface is fixedly installed at the upper end of the control board. An RS485 digital interface is installed at the upper end of the chassis, and the RS485 digital interface is located to the left of the 0-10V analog interface.

[0008] As a preferred technical solution of this application, the left end of the chassis is provided with two sets of heat dissipation vents, and an axial fan is installed in each of the two sets of heat dissipation vents.

[0009] As a preferred technical solution of this application, dustproof nets are installed at the openings of both sets of heat dissipation vents, and the dustproof nets are in contact with the two sets of axial flow fans.

[0010] As a preferred technical solution of this application, a partition is fixedly installed inside the housing, the left end of the partition is attached to the inner wall of the left end of the housing, and the right end of the partition is spaced from the inner wall of the right end of the housing.

[0011] As a preferred technical solution of this application, a touch screen is embedded in the front of the chassis.

[0012] (III) Beneficial Effects This variable air volume (VAV) controller integrates a digital differential pressure sensor chip and signal interface components on its main control board, eliminating the need for an additional differential pressure sensor. The controller has built-in programs for various scenarios, which users can select directly via the touchscreen or host computer without reprogramming. The controller program integrates differential pressure and airflow algorithms, supporting switching between differential pressure and airflow modes via the touchscreen or host computer. Furthermore, this VAV controller incorporates 4G and LoRa communication modules, achieving high integration and effectively reducing the error rate and cost of secondary programming, as well as lowering the difficulty and cost of later maintenance. In case of malfunction, only the controller needs to be replaced, eliminating the need for reprogramming and preventing program incompatibility issues due to programmer departures. This lowers the user's barrier to entry. The integrated sensor design reduces data inaccuracies caused by using sensors of varying quality, preventing errors when adjusting airflow. In situations where wired communication is unavailable, the controller supports wireless networking for centralized control. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of a variable air volume controller; Figure 2 This is a schematic diagram of the left-side structure of a variable air volume controller; Figure 3 This is a front view structural cross-sectional diagram of a variable air volume controller; Figure 4 This is a rear view schematic diagram of the control board in a variable air volume controller.

[0014] In the picture: 1. Chassis; 2. Heat dissipation vents; 3. Axial fan; 4. Dust filter; 5. Earplates; 6. Control board; 7. Partition; 8. 4-20mA analog interface; 9. Digital differential pressure sensor chip; 10. 0-10V analog interface; 11. Microprocessor; 12. RS485 digital interface; 13. Touch screen; 14. 4G and LoRa communication modules. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] This utility model provides a variable air volume controller, such as Figure 1-4 As shown, the variable air volume controller includes a housing 1, with ear plates 5 installed on both the left and right ends of the housing 1. A control board 6 is installed inside the housing 1. A digital differential pressure sensing chip 9 is integrated on the rear side of the control board 6. A microprocessor 11 is integrated on the front side of the control board 6. A 4G and LoRa communication module 14 is installed on the front side of the control board 6. A signal interface component is installed on the control board 6.

[0017] First, fix the housing 1 to the desired installation position using the ear plates 5 installed at its left and right ends, ensuring a stable installation. Next, install the control board 6 inside the housing 1. Integrate the digital differential pressure sensing chip 9 on the rear side of the control board 6. This chip can accurately sense changes in differential pressure, providing accurate data for subsequent control. Then, integrate the microprocessor 11 on the front side of the control board 6. The microprocessor 11 can quickly process and analyze the data transmitted from the sensing chip. At the same time, install the 4G and LoRa communication module 14 on the front side of the control board 6. This module can realize remote data transmission and communication, facilitating remote monitoring and operation of the controller. Finally, install the signal interface components on the control board 6. These signal interface components can be connected to external devices to realize data input and output, completing the installation and setup of the entire variable air volume controller, enabling it to work normally and achieve precise control of air volume.

[0018] The signal interface assembly includes a 4-20mA analog interface 8 and a 0-10V analog interface 10. The 4-20mA analog interface 8 is fixedly installed at the lower end of the control board 6, and the 0-10V analog interface 10 is fixedly installed at the upper end of the control board 6. An RS485 digital interface 12 is installed at the upper end of the chassis 1, and the RS485 digital interface 12 is located to the left of the 0-10V analog interface 10.

[0019] In practical applications, the 4-20mA analog interface 8 can be used to connect some sensors that support this current signal output. It can stably transmit the analog signals collected by the sensors and has strong anti-interference capabilities. The 0-10V analog interface 10 is suitable for connecting some devices that output data in the form of voltage signals. Through this interface, the voltage signal corresponding to the wind speed can be accurately obtained and then converted into wind speed data. The RS485 digital interface 12 installed on the top of the box 1 plays an important role when digital communication networking with multiple devices is required. It can realize efficient and reliable data exchange between the controller and other digital devices.

[0020] Two sets of heat dissipation vents 2 are provided on the left end of the chassis 1, and an axial fan 3 is installed in each set of heat dissipation vents 2.

[0021] When the variable air volume controller works for a long time, the electronic components on the control board 6 will generate heat. If the heat is not dissipated in time, the internal temperature of the controller will rise, affecting the performance of the components or even damaging them. At this time, the axial fans 3 in the two sets of heat dissipation vents 2 start to run, drawing cold air from the outside into the housing 1 and expelling hot air from the inside, forming air convection, effectively reducing the internal temperature of the controller and ensuring that the controller works stably in a suitable temperature environment.

[0022] Dust filters 4 are installed at the openings of both sets of heat dissipation vents 2, and the two sets of dust filters 4 are in contact with the two sets of axial fans 3.

[0023] During the operation of the variable air volume controller, dust and other impurities in the external environment may enter the housing 1 with the airflow. Dust adhering to the control board 6 and electronic components will affect the heat dissipation of the components and may also cause problems such as poor contact of the components. The dustproof mesh 4 installed at the opening of the heat dissipation port 2 can effectively block dust from entering the housing 1.

[0024] A partition 7 is fixedly installed inside the housing 1. The left end of the partition 7 is attached to the inner wall of the left end of the housing 1, and the right end of the partition 7 is spaced from the inner wall of the right end of the housing 1.

[0025] The partition 7 rationally divides the internal space of the housing 1. On the one hand, it provides support and fixation for electronic components such as the control board 6, reducing the shaking of components during operation and improving the stability of the equipment. On the other hand, the distance between the partition 7 and the inner wall of the right end of the housing 1 forms a relatively independent channel, which is conducive to the air circulation inside the housing 1. When the axial fan 3 is running, the air can flow more smoothly inside the housing 1, further improving the heat dissipation effect. At the same time, it can also reduce the impact of external interference on the electronic components on the control board 6 to a certain extent.

[0026] A touch display screen 13 is embedded in the front of the chassis 1.

[0027] The installation of the touch screen 13 provides users with an intuitive and convenient operating interface. Users can directly view the controller's working status through the touch screen 13, including key information such as the current differential pressure value, air volume, and communication status.

[0028] Working principle: When the variable air volume (VAV) controller is activated, the digital differential pressure sensor chip 9 begins to sense the differential pressure changes in the system in real time and transmits the sensed data as an electrical signal to the microprocessor 11 integrated on the front side of the control board 6. After receiving the data, the microprocessor 11 quickly processes and analyzes the data based on built-in multi-scenario usage programs and differential pressure and air volume algorithms, rapidly calculating the required adjustment amount. If the user selects differential pressure mode via the touch screen 13 or the host computer, the microprocessor 11 will generate control commands according to the differential pressure-related algorithm. If air volume mode is selected, the control commands are calculated based on the air volume algorithm. The calculated control commands are transmitted through the signal interface components on the control board 6. The 4-20mA analog interface 8 and the 0-10V analog interface 10 can communicate with the corresponding controllers. The controller is connected to the actuator, which transmits control commands in the form of analog signals to adjust the opening of the damper actuator, thereby achieving precise regulation of the air volume. At the same time, the RS485 digital interface 12 can communicate with other digital devices to achieve data exchange and sharing. When remote monitoring and operation are required, the 4G and LoRa communication modules 14 play a role in transmitting the controller's data remotely to the monitoring center and receiving commands from the monitoring center to achieve remote control of the controller. Throughout the operation, the axial fan 3 runs continuously to ensure air circulation inside the housing 1, allowing the controller to operate stably at a suitable temperature. The dustproof net 4 effectively blocks dust from entering, ensuring the normal operation of internal components. The touch screen 13 displays the controller's working status in real time, allowing users to understand the system's operating status at any time.

[0029] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A variable air volume controller, comprising a housing (1), characterized in that: The box (1) has ear plates (5) installed on both the left and right ends. The box (1) has a control board (6) installed inside. The control board (6) has a digital differential pressure sensing chip (9) integrated on the rear side. The control board (6) has a microprocessor (11) integrated on the front side. The control board (6) has a 4G and LoRa communication module (14) on the front side. The control board (6) has a signal interface component.

2. A variable air volume controller according to claim 1, characterized in that: The signal interface assembly includes a 4-20mA analog interface (8) and a 0-10V analog interface (10). The 4-20mA analog interface (8) is fixedly installed at the lower end of the control board (6), and the 0-10V analog interface (10) is fixedly installed at the upper end of the control board (6). An RS485 digital interface (12) is installed at the upper end of the housing (1), and the RS485 digital interface (12) is located to the left of the 0-10V analog interface (10).

3. A variable air volume controller according to claim 1, characterized in that: The left end of the casing (1) is provided with two sets of heat dissipation vents (2), and each set of heat dissipation vents (2) is equipped with an axial flow fan (3).

4. A variable air volume controller according to claim 3, characterized in that: Dustproof mesh (4) is installed at the opening of both sets of heat dissipation vents (2), and the dustproof mesh (4) is attached to the two sets of axial flow fans (3).

5. A variable air volume controller according to claim 1, characterized in that: A partition (7) is fixedly installed inside the housing (1). The left end of the partition (7) is attached to the inner wall of the left end of the housing (1), and the right end of the partition (7) is spaced from the inner wall of the right end of the housing (1).

6. A variable air volume controller according to claim 1, characterized in that: The front of the housing (1) is embedded with a touch screen (13).

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