Dry-type contact remote control circuit of dehumidifier

Abstract

The invention relates to the technical field of dehumidifier control, and particularly discloses a dry-type contact remote control circuit of a dehumidifier, which comprises a human-machine interface (HMI), a power supply connecting cable and a communication terminal strip, the HMI is used for setting various parameters, locally operating the dehumidifier and displaying all real-time operating parameters; the communication terminal strip is provided with connection points used for being connected with an E11 remote wire controller, an RS485 Modbus communication device, an automatic drainage float switch and other devices. The power connection cable supplies power to the whole dehumidifier. Local or remote operation can be carried out through the human-machine interface HMI or the E11 remote wire controller, frequent manual operation of a start-stop button on equipment is not needed, the manual workload is reduced, and the agricultural production efficiency is improved. In the aspect of humidity control, the problem of humidity sensing difference caused by installation positions is avoided through multi-machine joint control and dry-type contact remote control functions achieved through RS485 Modbus communication.

Description

Technical Field

[0001] The present invention relates to the technical field of dehumidifier control, and particularly to a dry contact remote control circuit for a dehumidifier. Background Art

[0002] In the field of greenhouse cultivation in modern agriculture, the precise regulation of environmental humidity plays a crucial role in the growth quality of cash crops. As a dehumidification device specifically used for greenhouses, agricultural dehumidifiers are of great importance. They can precisely control the humidity in the greenhouse and create a suitable growth environment for crops. However, in many regions, humid climate has become a major problem faced by the planting industry. Taking the plum rain season in the south of China as an example, the relative humidity in the air often soars to 80% or even higher. For greenhouse cultivation, this high-humidity environment is almost an inevitable trouble. Excessive moisture will cause a series of problems, such as the breeding of crop pests and diseases, affecting the photosynthesis and respiration of crops, and thus reducing the yield and quality of crops.

[0003] Existing dehumidifiers have many defects in actual applications. In terms of operation convenience, although its control circuit is relatively simple, it brings great inconvenience to operators. After each unit is powered on again, operators need to manually operate the start and stop buttons on the device to control the start and stop of the unit. In the case of large-scale greenhouses and a large number of dehumidifiers, this undoubtedly greatly increases the workload of operators and consumes a large amount of labor and time costs.

[0004] From the aspect of dehumidification effect analysis, due to the generally large area of greenhouses, existing dehumidifiers are significantly affected by the installation location. The humidity sensed by dehumidifiers at different positions is different. There are often situations where the dehumidifier in the corner has stopped working while the dehumidifier in the middle of the greenhouse is still running. This makes the dehumidifier unable to fully exert its due dehumidification effect, unable to achieve balanced and effective control of the humidity in the greenhouse, and affecting the stability of the crop growth environment. Summary of the Invention

[0005] The present invention aims to provide an agricultural dehumidifier to solve the problems of inconvenient operation of existing dehumidifiers and the influence of dehumidification effect by the installation location. By integrating various control interfaces and functional modules, it realizes convenient operation and precise control of the dehumidifier, reduces manual intervention, and improves agricultural production efficiency; at the same time, it optimizes the humidity sensing and control methods to ensure uniform humidity in the greenhouse, fully exerts the dehumidification effect, and creates an ideal humidity environment for crop growth.

[0006] The object of the present invention can be achieved by the following technical solutions: A dry contact remote control circuit for a dehumidifier, including a human-machine interface HMI, a power supply connecting cable, and a communication terminal block; The human-machine interface HMI is used to set various parameters, perform local operations on the dehumidifier, and display all real-time operating parameters; The communication terminal block is designed with connection points for connecting devices such as the E11 remote controller, RS485 Modbus communication, and automatic drainage float switch; the power supply cable provides power for the entire dehumidifier.

[0007] As a further solution of the present invention: The human-machine interface HMI is provided with a wired remote controller E11 optional accessory interface. The E11 remote controller integrates the human-machine interface HMI function module, has a remote control function interface for the unit and an RS485 Modbus communication control function interface, and the wire length of the E11 remote controller is 9 meters.

[0008] As a further solution of the present invention: The RS485 Modbus communication transmits data through RS485 A and RS485 B. The maximum number of units connected to a bus is 125, and a 120-ohm resistor is installed to ensure correct termination. The unit address is set and "CONTROL-R / L" is ensured to be set to "LOCAL" locally.

[0009] As a further solution of the present invention: The dry contact remote control includes: The external normally closed dry contact FLOAT of the float switch: The device provides a signal voltage, which is activated by setting [FLOATSWITCH] = "NC" in the HMI menu, and is used to connect to the customer's water storage tank. When the water storage tank is full, the float switch disconnects, controlling the dehumidifier to stop dehumidifying; The external normally open dry contact DHUM: The signal voltage is provided by the unit and is activated by setting [Control-R / L] = "REMOTE" in the HMI menu, and is used to remotely control the on / off of the dehumidification function; The external normally open dry contact FAN of the fan switch: The device provides a signal voltage, which is activated by setting [Control-R / L] = "REMOTE" in the HMI menu, and is used to control the start of the fan; "COM" serves as a common connection point for "FLOAT", "DEHU", and "FAN", and its states include normally open and normally closed.

[0010] As a further solution of the present invention: The communication terminal block is provided with +15v output and 0V for powering the E11 remote controller, and also has a "MODBUS" field bus communication connection interface and a DaisyChain2 dedicated output interface for "Output (DEH + COM2)".

[0011] As a further solution of the present invention: when applied in a planting area, if there is RS485 Modbus in the area, multiple said dehumidifiers can be directly connected for control; if the application site is remote, the dehumidifiers can be communicatively connected through the host computer and PLC in the control room, and the dehumidifier unit group can be controlled according to the real-time monitoring data.

[0012] Advantages of the present invention: The agricultural dehumidifier of the present invention significantly improves the operation convenience by integrating multiple control interfaces and a human-machine interface (HMI). Operators can perform local or remote operations through the human-machine interface (HMI) or the E11 remote controller, without frequently manually operating the start-stop buttons on the device, reducing the manual workload and improving the agricultural production efficiency. In terms of humidity control, the multi-machine joint control and dry contact remote control functions achieved through RS485 Modbus communication can accurately control according to the humidity conditions at different positions in the greenhouse, avoiding the problem of humidity induction differences caused by the installation position, ensuring uniform humidity in the greenhouse, giving full play to the dehumidification effect, creating a good humidity environment for the growth of crops, being beneficial to improving the yield and quality of crops, and promoting the efficient development of modern agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 is a schematic structural diagram of the human-machine interface HMI in the present invention; Figure 2 is a schematic connection diagram of the power supply cable in the present invention; Figure 3 is a schematic circuit connection diagram of the E11 remote controller in the present invention; Figure 4 is a schematic circuit connection diagram of the RS485 Modbus communication in the present invention; Figure 5 is a schematic circuit connection diagram of the dry contact remote control in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0016] Please refer to Figures 1 - 5As shown in the figure, the present invention is a dry contact remote control circuit for a dehumidifier, mainly including a human-machine interface (HMI), a power supply cable, a communication terminal block, and related control circuits. The human-machine interface (HMI), as the core operating component, is closely connected to other parts, responsible for receiving instructions from operators and feedbacking the operating status of the device. The power supply cable provides power support for the entire dehumidifier to ensure the normal operation of the device. The communication terminal block undertakes the important functions of data transmission and device connection, and realizes communication and collaborative work with external devices through different interfaces.

[0017] Among them, the human-machine interface (HMI) conducts data interaction with the communication terminal block through the internal circuit to realize the transmission of functions such as parameter setting and status display. The power supply cable is connected to the power module of the dehumidifier to supply power to each component. Different interfaces on the communication terminal block, such as RS485 Modbus communication interfaces and dry contact remote control interfaces, are respectively connected to corresponding external devices to realize different control functions.

[0018] The human-machine interface (HMI), as Figure 1 shown in the figure, is the core of the operation and monitoring of the entire dehumidifier. It is mainly used to set various parameters, such as humidity set value, operation mode, etc. Operators can easily perform local operations on the dehumidifier through the HMI, start or stop the dehumidifier, switch working modes, etc. At the same time, the HMI can also display all the operating parameters of the dehumidifier in real time, including the current humidity, temperature, device operating status, etc., which is convenient for operators to understand the working conditions of the device at any time. It is also possible to select a wired remote controller E11 for remote operation. The wire length of the E11 remote controller is about 9 meters (29 feet), which is convenient for operators to flexibly control the dehumidifier within a certain range. It integrates some function modules in the human-machine interface (HMI), further improving the convenience of operation.

[0019] The power supply cable, as Figure 2 shown in the figure, provides power for the entire dehumidifier.

[0020] As Figure 3 shown in the figure, the E11 remote wire controller, as an optional accessory for the dehumidifier, integrates function modules in the human-machine interface (HMI) to realize remote control of the unit and the RS485 Modbus communication control function interface.

[0021] As Figure 4As shown, RS485 Modbus communication plays an important role in this dehumidifier. RS485 A and RS485B are used for Modbus communication. When in use, the unit address needs to be set referring to the preset setup instructions, and ensure that "CONTROL -R / L" is set to "LOCAL" locally. On a single bus, up to 125 units can be connected. To ensure the accuracy and stability of communication, a 120-ohm resistance value (measured with a multimeter) needs to be installed for proper termination. The detailed bus wiring method can be referred to the relevant diagrams. This communication method enables the dehumidifier to interact with other devices supporting the Modbus communication protocol, realizing centralized control and remote monitoring.

[0022] As Figure 5 shown, dry contact remote control is the main function of this invention, but extra care needs to be taken during operation because low voltage may cause equipment damage. Therefore, make sure the power supply is disconnected before starting the installation.

[0023] The dry contact input from the humidistat has multiple control functions. Among them, for the normally closed dry contact (FLOAT) of the float switch outside, the device will provide a signal voltage. When [FLOAT SWITCH] = "NC" is set in the HMI menu, this function is activated. This float switch is used to connect to the customer's water storage tank. When the water storage tank is full, the float switch disconnects, and the dehumidifier stops dehumidifying after receiving the signal, effectively avoiding further increase in water volume and preventing problems such as water overflow.

[0024] The external normally open dry contact (DHUM) is used to remotely control the on / off of the dehumidification function, and the signal voltage is provided by the unit. This function is activated by setting [Control - R / L] = "REMOTE" in the HMI menu, which facilitates the operator to remotely control the dehumidification working status of the dehumidifier.

[0025] The external normally open dry contact (FAN) of the fan switch is also provided with a signal voltage by the device and can be activated after setting [Control - R / L] = "REMOTE" in the HMI menu. It is used to control the start and stop of the fan, realizing remote control of the ventilation function of the dehumidifier.

[0026] "COM" serves as the common connection point for "FLOAT", "DEHU", and "FAN", and its normally closed or normally open state can be set according to actual needs, enhancing the flexibility of control.

[0027] In addition, +15v output and 0V are also provided on the communication terminal block to power the E11 remote controller and ensure its normal operation. The "MODBUS" interface is used for fieldbus communication connection, and the "Output (DEH + COM2)" is a dedicated output for Daisy Chain2, providing more possibilities for device expansion and collaborative work.

[0028] Through the collaborative work of the above-mentioned parts, the dry contact remote control circuit of this dehumidifier can achieve efficient and precise humidity control, providing reliable humidity regulation guarantee for modern agricultural planting, effectively solving the problems existing in the prior art, and improving the performance and practicability of the dehumidifier.

[0029] Due to the large area of the planting area, generally multiple dehumidifiers need to be installed. If there is RS485 Modbus in the application area, multiple dehumidifiers can be directly connected for control. If the application occasion is relatively remote, the dehumidifiers can be communicatively connected through the host computer and PLC in the control room equipped by the farm, and the dehumidifier unit group can be controlled according to the real-time monitoring data. Additionally, the start and stop of this unit are controlled according to the float switch on the dehumidifier terminal block.

[0030] The above has detailedly described an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A dry contact remote control circuit for a dehumidifier, characterized in that It includes a human-machine interface HMI, a power supply cable, and a communication terminal block; The human-machine interface HMI is used to set various parameters, perform local operations on the dehumidifier, and display all real-time operating parameters; The communication terminal block is designed with connection points for connecting devices such as an E11 remote controller, RS485 Modbus communication, and an automatic drainage float switch; the power supply cable provides power for the entire dehumidifier.

2. The dry contact remote control circuit of a dehumidifier according to claim 1, characterized in that The human-machine interface HMI is provided with an optional accessory interface for a wired remote controller E11. The E11 remote controller integrates the human-machine interface HMI function module, has a remote control function interface for the unit and an RS485 Modbus communication control function interface, and the wire length of the E11 remote controller is 9 meters.

3. The dry contact remote control circuit of a dehumidifier according to claim 1, characterized in that, The RS485 Modbus communication transmits data through RS485 A and RS485 B. The maximum number of units connected to a bus is 125, and a 120-ohm resistor is installed to ensure correct termination. The unit address is set and "CONTROL-R / L” is ensured to be set to "LOCAL”.

4. The dry contact remote control circuit of a dehumidifier according to claim 1, characterized in that The dry contact remote control includes: The external normally closed dry contact FLOAT of the float switch: The device provides a signal voltage, which is activated by setting [FLOATSWITCH]="NC” in the HMI menu and is used to connect to the customer's storage tank. When the storage tank is full of water, the float switch disconnects to control the dehumidifier to stop dehumidifying; The external normally open dry contact DHUM: The signal voltage is provided by the unit and is activated by setting [Control-R / L]="REMOTE” in the HMI menu and is used to remotely control the on / off of the dehumidification function; The external normally open dry contact FAN of the fan switch: The device provides a signal voltage and is activated by setting [Control-R / L]="REMOTE” in the HMI menu and is used to control the start of the fan; "COM” serves as a common connection point for "FLOAT”, "DEHU”, and "FAN”, and its states include normally open and normally closed.

5. The dry contact remote control circuit of a dehumidifier according to claim 1, characterized in that, The communication terminal block is provided with +15v output and 0V for powering the E11 remote controller, and also has a "MODBUS” field bus communication connection interface and a DaisyChain2 dedicated output interface for "Output (DEH+COM2)”.

6. The dry contact remote control circuit of a dehumidifier according to claim 1, characterized in that, When applied in the planting area, if there is RS485 Modbus in the area, multiple dehumidifiers can be directly connected for control; if the application site is remote, the dehumidifiers can be communicatively connected through the host computer and PLC in the control room, and the dehumidifier unit group can be controlled according to the real-time monitoring data.

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