Heating and ventilation system

Abstract

The embodiment of the utility model provides a heating and ventilation system. The heating and ventilation system comprises a heating and ventilation device; the control mainboard comprises a first communication circuit; the at least one relay plate comprises a second communication circuit, the relay plate is connected with at least two electrical components, and the electrical components are arranged on the heating and ventilation device; the first communication cable is respectively connected with the first communication circuit and the second communication circuit; the relay board is used for sending a detection signal from a corresponding electrical component to the control mainboard through the first communication cable; and / or the control main board is used for sending a control signal to the relay board through the first communication cable, so that the relay board controls the corresponding electrical component according to the control signal. According to the technical scheme disclosed by the invention, the length of the connecting wire on the electrical component is reduced, the cost is reduced, arrangement and binding of the wire are facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of HVAC technology, and in particular to a HVAC system. Background Art

[0002] HVAC systems (also called air conditioning equipment), especially multi-split units and modular units, usually have multiple sensors and multiple loads. Sensors may include temperature sensors (such as ambient temperature sensors, pipe temperature sensors, compressor exhaust temperature sensors, etc.), pressure sensors (such as high-pressure pressure sensors, low-pressure pressure sensors, etc.), humidity sensors, gas sensors, pressure switches, temperature switches, etc. Loads may include solenoid valves (usually two-way valves), electronic expansion valves, electric heaters, etc. The sum of the number of sensors and loads generally ranges from a few to dozens. These electrical components are generally connected to the control motherboard separately through multi-core wires, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the connection between a control mainboard and multiple electrical components in the prior art.

[0003] from Figure 1 It can be seen that each sensor and load needs to be connected to the control motherboard from various locations in the HVAC system pipeline. Therefore, the peripheral wires of the control motherboard are numerous and complex. During the production process, relevant personnel need to organize and bundle the wires in the complex pipelines, and also consider separating the strong and weak currents. They also need to consider interference, crosstalk, and avoiding high-temperature pipelines, resulting in low production efficiency. In addition, for the outdoor units of air-conditioning equipment, the box sizes of different matching numbers are different, and the positions of various sensors are also different. In order to be compatible with outdoor units of different capacity segments, the wires are usually set according to the maximum length to be compatible with each outdoor unit. This causes most of the wires to be long, resulting in wire waste. In addition, during the production and installation process, the long wires need to be organized and bundled, reducing the production and installation efficiency. Utility Model Content

[0004] The embodiments of the present disclosure provide a HVAC system to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a HVAC system, including:

[0006] The HVAC device includes a compressor module and at least one first heat exchange module, the compressor module and the at least one first heat exchange module are connected through a pipeline, and the compressor module is used to drive a heat exchange medium to flow at least between the compressor module and the at least one first heat exchange module;

[0007] A control mainboard, comprising a first communication circuit;

[0008] at least one relay board, the relay board including a second communication circuit, the relay board being connected to at least two electrical components, the electrical components being provided in the HVAC device;

[0009] a first communication cable connected to the first communication circuit and the second communication circuit respectively;

[0010] The relay board is used to send the detection signal from the corresponding electrical component to the control main board through the first communication cable; and / or, the control main board is used to send the control signal to the relay board through the first communication cable so that the relay board controls the corresponding electrical component according to the control signal.

[0011] In some embodiments, the control main board also includes a first power circuit, the relay board also includes a second power circuit, the HVAC system also includes a first power cable, and the first power circuit and the second power circuit are connected through the first power cable.

[0012] In some embodiments, the control main board also includes a first power supply circuit, the relay board also includes a second power supply circuit, the first communication cable is connected to the first communication circuit and the first power supply circuit, and is also connected to the second communication circuit and the second power supply circuit. The control main board and the relay board connected by the first communication cable are also used to transmit power signals through the first communication cable.

[0013] In some embodiments, there are multiple relay boards, including a first relay board closest to the control main board, the first relay board is connected to the control main board through a first communication cable, the HVAC system also includes a second communication cable, and the multiple relay boards are connected in sequence through the second communication cable.

[0014] In some embodiments, multiple relay boards include a node relay board and a subsequent relay board, the subsequent relay board is a relay board located after the node relay board in the communication line, the number of subsequent relay boards is at least two, and the relay board closest to the node relay board among the at least two subsequent relay boards is connected to the node relay board through a second communication cable.

[0015] In some embodiments, the relay board also includes a second power supply circuit, one end of the second communication cable is connected to the second communication circuit and the second power supply circuit of the corresponding relay board, and the other end of the second communication cable is connected to the second communication circuit and the second power supply circuit of the corresponding relay board, and the two relay boards connected by the second communication cable also transmit power signals through the second communication cable.

[0016] In some embodiments, the system further includes a second power cable, the relay board further includes a second power circuit, the second power circuits of the plurality of relay boards are sequentially connected via the second power cables, and one second power cable is connected to the second power circuits of two relay boards respectively;

[0017] The second power supply circuit of the first relay board is connected to the control main board, or the second power supply circuit of the first relay board is connected to the power supply module.

[0018] In some embodiments, multiple relay boards include a node relay board and a subsequent relay board, the subsequent relay board is a relay board located after the node relay board in the power line, the number of subsequent relay boards is at least two, and the relay board closest to the node relay board among the at least two subsequent relay boards is connected to the node relay board via a second power cable.

[0019] In some embodiments, a second power cable is also included, and the relay board also includes a second power circuit. The second power circuits of multiple relay boards are connected in sequence through the second power cable, and the second power circuit of at least one relay board among the multiple relay boards is connected to the power module.

[0020] In some embodiments, a relay board closest to the power module among the plurality of relay boards is connected to the power module.

[0021] In some embodiments, the electrical components include sensors and / or loads.

[0022] In some embodiments, the sensor includes at least one of a temperature sensor, a pressure sensor, a humidity sensor, a gas sensor, a pressure switch, and a temperature switch;

[0023] The load includes at least one of a two-way valve, a four-way valve, an electronic expansion valve, an electric heater, a compressor, and a fan of a heat exchange module.

[0024] In some embodiments, the relay board is connected to at least one sensor and at least one load. The relay board is used to receive a detection signal from the sensor and send the detection signal to the control main board through a first communication cable, and receive a control signal from the control main board through the first communication cable, and control the load according to the control signal.

[0025] In some embodiments, an electric control box is also included, in which the control main board and at least one relay board are both located. The electric control box is provided with a maintenance port. When the maintenance port is open, the control main board and the relay board are both exposed through the maintenance port.

[0026] In some embodiments, the HVAC device includes a HVAC circuit, which includes a four-way valve for switching the HVAC device between cooling mode and heating mode, and at least one relay board is provided on the four-way valve.

[0027] In some embodiments, the HVAC device includes a HVAC circuit, an enthalpy increase circuit and an auxiliary return air circuit. The enthalpy increase circuit includes an auxiliary circuit of a subcooler and a first solenoid valve. The auxiliary return air circuit includes an auxiliary circuit of the subcooler and a second solenoid valve. The auxiliary circuit of the subcooler includes a third port and a fourth port of the subcooler. The first port and the second port of the subcooler are located in the HVAC circuit. The second port is also connected to the third port of the subcooler. The fourth port of the subcooler is connected to both the first solenoid valve and the second solenoid valve. The other end of the second solenoid valve is connected to the inlet of the gas-liquid separator in the HVAC circuit. The other end of the first solenoid valve is connected to the enthalpy increase port of the compressor in the HVAC circuit. The first solenoid valve and the second solenoid valve are connected to the same relay board. The relay board is also used to selectively control one of the first solenoid valve and the second solenoid valve to be turned on according to a control signal received from the control main board.

[0028] In some embodiments, there are multiple relay boards, and the distance between multiple electrical components connected to the same relay board and the relay board is less than or equal to a first preset value.

[0029] In some embodiments, there are multiple relay boards, and at least two relay boards are arranged at different positions.

[0030] In some embodiments, the first microcontroller unit in the control main board is used to generate a corresponding control signal based on a detection signal received from at least one relay board, and is also used to perform fault analysis and prediction based on the detection signal and stored data.

[0031] In some embodiments, there are multiple relay boards, each relay board is set with a unique address code, the detection signal is configured with the address code, and the control signal is configured with the address code.

[0032] In some embodiments, the first communication cable is a communication bus, and the second communication circuit of the relay board is connected to the first communication cable through a communication adapter line.

[0033] According to the technical solution of the embodiment of the present disclosure, at least two electrical components arranged in the HVAC device are no longer directly connected to the control main board, but are connected to the relay board. The relay board and the control main board are connected by a first communication cable, which greatly reduces the number of wires on the control main board, reduces the interference around the control main board, and improves the product performance; and the position of the relay board can be set according to the position of the electrical components. For example, the relay board can be set at a location where multiple electrical components are concentrated. In this way, the length of the wires between the electrical components and the relay board can be reduced, the cost can be reduced, and the arrangement and bundling of the wires can be facilitated, which is conducive to improving the production and installation efficiency.

[0034] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0036] Figure 1 This is a schematic diagram of the connection between the control mainboard and multiple electrical components in the prior art;

[0037] Figure 2 This is a connection diagram of the control part of the HVAC system according to an embodiment of the present disclosure;

[0038] Figure 3 This is a connection diagram of a control part in a HVAC system according to another embodiment of the present disclosure;

[0039] Figure 4 This is a connection diagram of a control part in a HVAC system according to another embodiment of the present disclosure;

[0040] Figure 5 This is a connection diagram of a control part in a HVAC system according to another embodiment of the present disclosure;

[0041] Figure 6 This is a schematic diagram of the pipe connections of a HVAC device in a HVAC system according to an embodiment of the present disclosure;

[0042] Figure 7 Schematic diagram of a relay plate provided on a four-way valve in one embodiment. DETAILED DESCRIPTION

[0043] In the following, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined in any manner without conflict. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0044] Figure 2 This is a connection diagram of the control part of the HVAC system according to an embodiment of the present disclosure. Figure 3 FIG. 1 is a connection diagram of the control part in the HVAC system according to another embodiment of the present disclosure. Figure 2 and Figure 3As shown, the HVAC system includes a HVAC device, a control main board 10, at least one relay board 20 and a first communication cable C Cable1.

[0045] The HVAC device may include a compressor module and at least one first heat exchange module. The compressor module may include a compressor. The first heat exchange module may include a first heat exchanger. The compressor module and the at least one first heat exchange module are connected via a pipeline. The compressor module is configured to drive a heat exchange medium to circulate between at least the compressor module and the at least one first heat exchange module.

[0046] Exemplarily, the HVAC device may further include at least one second heat exchange module, and the compressor module is further connected to the at least one second heat exchange module through a pipeline. One of the first heat exchange module and the second heat exchange module may be arranged indoors, and the other may be arranged outdoors. For example, the first heat exchange module may be arranged outdoors, and the second heat exchange module may be arranged indoors. The compressor module is used to drive the heat exchange medium to circulate between the at least one first heat exchange module and the at least one second heat exchange module. The first heat exchanger module is used to realize heat exchange between the heat exchange medium and the outdoor environment, and the second heat exchanger module is used to use the heat exchange medium to adjust the temperature of the target control space.

[0047] There can be one or more first heat exchange modules. When there are multiple first heat exchange modules, the multiple first heat exchange modules can be arranged in parallel through pipelines. There can be one or more second heat exchange modules. When there are multiple second heat exchange modules, the multiple second heat exchange modules can be arranged in parallel through pipelines. A solenoid valve can be installed in the pipeline of each first heat exchange module and each second heat exchange module. By controlling the on / off state of the solenoid valve, it is possible to control whether each first heat exchange module and each second heat exchange module participates in the circulation of the heat exchange medium.

[0048] The control motherboard 10 is the core control module of the HVAC system. Exemplarily, the control motherboard 10 includes a first communication circuit and a first microcontroller unit (MCU1), with the first communication circuit connected to the first microcontroller unit. The control motherboard 10 may also include a first printed circuit board (PCB), with the first microcontroller unit and the first communication circuit disposed on the first PCB and connected via wires on the first PCB. In another embodiment, the first communication circuit may be integrated into the first microcontroller unit, that is, the first communication circuit is part of the first microcontroller unit.

[0049] The relay board 20 includes a second communication circuit and a second microprocessor unit (MCU2), and the second communication circuit is connected to the second microcontroller unit. The relay board 20 is connected to at least two electrical components. The electrical components are arranged in the HVAC device. For example, the relay board 20 may include at least two peripheral interfaces, and the pins of each peripheral interface are connected to the second microprocessor unit. At least two electrical components are connected to the peripheral interfaces of the relay board 20 to realize the connection between the electrical components and the second microprocessor unit, so that the second microprocessor unit can receive signals from the electrical components or send signals to the electrical components.

[0050] The relay board 20 may further include a second printed circuit board, on which the second microprocessing unit and the second communication circuit are disposed and connected via wires on the second printed circuit board. In another embodiment, the second communication circuit may be integrated into the second microcontroller unit, that is, the second communication circuit is part of the second microcontroller unit. The peripheral interface may be an electrical connector for connecting to an electrical component, and the peripheral interface is disposed on the second printed circuit board and connected to the second microprocessing unit via wires on the second printed circuit board. For example, the peripheral interface may be a socket, and the wires of the electrical component are connected to a plug, which is plugged into a corresponding socket to achieve connection between the relay board 20 and the electrical component.

[0051] Electrical components are installed in the HVAC system. For example, the electrical components can be installed in the pipelines of the HVAC system, or the electrical components can be installed near the components or pipelines in the HVAC system. Electrical components include sensors and / or loads. The sensor can be installed in the pipeline of the HVAC system, or on the outer wall of the pipeline, or in the environment where the HVAC system is located. The installation location of the sensor can be determined based on the performance of the sensor. The load is an actuator that requires power to work. For example, the load can be a solenoid valve, a four-way valve, an electronic expansion valve, or other valves installed in the pipeline; the load can also be an actuator such as a compressor, a fan, or an electric heater.

[0052] The first communication cable C Cable1 is connected to the first communication circuit of the control main board and the second communication circuit of the relay board respectively, so that the control main board 10 and the relay board 20 can communicate through the first communication cable C Cable1.

[0053] The relay board 20 is used or capable of transmitting detection signals from corresponding electrical components to the control main board 10 via the first communication cable C Cable1. The control main board 10 is used or capable of transmitting control signals to the relay board 20 via the first communication cable C Cable1, so that the relay board 20 controls the corresponding electrical components based on the control signals. Thus, the first communication cable C Cable1 can transmit detection signals from the relay board 20 to the control main board 10; the first communication cable C Cable1 can also transmit control signals generated by the control main board 10 to the relay board 20, so that the relay board 20 controls the corresponding electrical components.

[0054] For example, the relay board 20 can be connected to a sensor, which transmits detection signals from the sensor to the control main board 10 via the first communication cable C Cable1. The relay board 20 can also be connected to a load. After the control main board 10 generates a control signal, it transmits the control signal to the relay board 20 via the first communication cable C Cable1, so that the relay board 20 controls the load according to the control signal.

[0055] It should be noted that the detection signal in this article is the signal transmitted by the relay board 20 to the control main board 10. The detection signal comes from the sensor. It can be understood that the relay board 20 can directly collect the detection signal from the sensor, or it can also be understood that the relay board 20 can process the signal collected from the sensor as the detection signal.

[0056] After receiving the detection signal, the control mainboard 10 can generate a corresponding control signal according to the detection signal. The control mainboard 10 can also monitor the status of the HVAC device through the detection signal and generate monitoring information or alarm information when necessary.

[0057] In the related art, air conditioning equipment, especially multi-split units, modular units and other large-capacity outdoor units, generally have multiple sensors and multiple loads, and the total number of these sensors and loads is about dozens. Figure 1 As shown, a large number of sensors and loads are connected to the control main board 10 through multi-core wires from various positions of the pipeline, resulting in a large number of wires around the control main board 10, and most of the wires are long, resulting in wire waste. During the production and installation process, the long wires need to be sorted and bundled, reducing the production and installation efficiency.

[0058] It should be noted that Figure 1 The number of core wires used to connect the sensor or load to the control board 10 is schematically shown in FIG. 1 . It is understood that the number of core wires used to connect the electrical components to the control board 10 is determined by the characteristics of the electrical components and is not limited to Figure 1 The number of cores shown in .

[0059] According to the technical solution disclosed herein, a control main board 10 and at least one relay board 20 are provided in a HVAC system. The second communication circuit of the relay board 20 is connected to the first communication circuit of the control main board 10 via a first communication cable C Cable1. At least two electrical components provided in the HVAC device are connected to the relay board 20. The relay board 20 and the control main board 10 transmit signals via the first communication cable C Cable1. That is, the relay board 20 can send detection signals from corresponding electrical components to the control main board 10 via the first communication cable C Cable1; and / or, the control main board 10 can send control signals to the relay board 20 via the first communication cable CCable1, so that the relay board 20 controls the corresponding electrical components according to the control signals. Therefore, in the HVAC system of the present invention, at least two electrical components arranged in the HVAC device are no longer directly connected to the control main board 10, but are connected to the relay board 20. The relay board 20 and the control main board 10 are connected via a first communication cable CCable1, which greatly reduces the number of wires on the control main board 10, reduces the interference around the control main board 10, and improves product performance; and the position of the relay board 20 can be set according to the position of the electrical components. For example, the relay board 20 can be set at a location where multiple electrical components are concentrated, so that the length of the wires between the electrical components and the relay board 20 can be reduced, the cost can be reduced, and the arrangement and bundling of the wires can be facilitated, which is conducive to improving production and installation efficiency.

[0060] In actual implementation, there is at least one relay board 20. The specific number of relay boards 20 can be set as needed. For example, for a multi-split or modular system, multiple relay boards 20 can be set; for a single-split system, the number of relay boards 20 can be one or more. The number of relay boards 20 can also be set based on the area where electrical components are concentrated. For example, in a HVAC system, there are multiple electrical component concentration areas, and a relay board 20 can be set in each concentration area. The electrical components in each concentration area are connected to the relay board 20, and the relay board 20 is connected to the control main board 10 via the first communication cable C Cable 1.

[0061] Exemplarily, there are multiple relay boards 20, and the distance between multiple electrical components connected to the same relay board 20 and the relay board 20 is less than or equal to a first preset value. Thus, the length of the connecting wire between the electrical component and the relay board 20 is less than or equal to the first preset value. Usually, the connecting wire is a part of the electrical component, and therefore, the length of the connecting wire on each electrical component can be set to the first preset value. By setting the length of the connecting wire on each electrical component to the first preset value, when installing the electrical component, there is no need to consider whether the installation position of the electrical component is appropriate. The electrical component can be installed at will, and all of them can meet the connection requirements with the relay board 20, which can further improve the production and installation efficiency and facilitate the standardization of the length of the electrical component wires.

[0062] For example, when there are multiple relay boards 20, at least two relay boards 20 are set at different positions, so that the connections of electrical components can be dispersed, which is beneficial to reducing the number of wires around the relay boards 20, facilitating the arrangement and bundling of wires, and improving production and installation efficiency.

[0063] Furthermore, in the related art, sensors and loads are directly connected to the control motherboard 10, resulting in a relatively large number of peripheral interfaces for connecting to electrical components on the control motherboard 10, making the control motherboard 10 larger and more complex in structure. In the present disclosure, electrical components are connected to the relay board 20 rather than directly to the control motherboard 10, significantly reducing the number of peripheral interfaces on the control motherboard 10, reducing the structural complexity of the control motherboard 10, and reducing the size of the control motherboard 10, thereby lowering costs.

[0064] For example, the first communication cable C Cable1 may adopt one of the communication protocols such as CAN, RS-232, RS-422, RS-485, etc. The number of core wires of the first communication cable C Cable1 may be determined according to the communication protocol.

[0065] In one embodiment, Figure 2 and Figure 3 As shown, the control mainboard 10 further includes a first power supply circuit, which can be connected to an external power source. The first power supply circuit can convert the external power source into the power required by the control mainboard 10, thereby supplying power to the control mainboard 10. The first power supply circuit can also be connected to the first microcontroller unit to provide the first microcontroller unit with an operating voltage.

[0066] The relay board 20 may also include a second power supply circuit. The HVAC system may also include a first power cable PCable1, and the first power supply circuit and the second power supply circuit are connected through the first power cable P Cable1. Thus, the first power supply circuit can supply power to the second power supply circuit, and the second power supply circuit can supply power to the relay board 20. The voltage provided by the first power supply circuit to the second power supply circuit can be the same as the voltage required by the relay board 20, so that the voltage received by the second power supply circuit can be directly used by the relay board 20. Exemplarily, the second power supply circuit can be a voltage conversion circuit, and the second power supply circuit can convert the first voltage received from the first power supply circuit into the second voltage required by the relay board 20, and supply power to the relay board 20. In this way, there is no need to set up a separate external power supply for the relay board 20. Instead, the control main board 10 supplies power to the relay board 20 through the first power cable PCable1, and only one first power cable P Cable1 is required to achieve this.

[0067] The second power supply circuit can be connected to the second micro control unit to provide an operating voltage to the second micro control unit.

[0068] In another embodiment, the second power supply circuit of the relay board 20 may be connected to an external power supply and no longer powered by the control main board 10 .

[0069] exist Figure 2 and Figure 3 In the embodiment, a first communication cable C Cable1 and a first power cable P Cable1 are connected between the relay board 20 and the control main board 10 .

[0070] Figure 4 FIG. 1 is a connection diagram of a control part in a HVAC system according to another embodiment of the present disclosure. Figure 4 As shown, the control main board 10 also includes a first power supply circuit, and the relay board 20 also includes a second power supply circuit. The first communication cable CCable1 is connected to the first communication circuit and the first power supply circuit, and is also connected to the second communication circuit and the second power supply circuit. For example, one end of the first communication cable C Cable1 is connected to the first communication circuit and the first power supply circuit, and the other end is connected to the second communication circuit and the second power supply circuit. The control main board 10 and the relay board 20 connected by the first communication cable are also used to transmit power signals through the first communication cable C Cable1. For example, the control main board 10 can transmit the power signal to the relay board 20 through the first communication cable CCable1, or the relay board 20 can transmit the power signal to the control main board 10 through the first communication cable C Cable1.

[0071] For example, the first communication cable C Cable1 can adopt carrier technology or LIN bus technology, so that the first communication cable C Cable1 can not only perform communication transmission between the control main board 10 and the relay board 20, but also perform power signal transmission between the control main board 10 and the relay board 20. Therefore, only one cable is needed between the control main board 10 and the relay board 20 to achieve communication transmission and power transmission, further reducing the number of cables between the two and reducing costs.

[0072] Figure 5 This is a connection diagram of the control part of the HVAC system in another embodiment of the present disclosure. When the number of relay boards 20 is small, there may be electrical components that are far away from the relay boards 20 and need to be connected to the relay boards 20, resulting in longer wires required for the electrical components and waste of wires. For example, Figure 5As shown, there can be multiple relay boards 20. The positions of the multiple relay boards 20 can be set as needed. The multiple relay boards 20 include a first relay board 20 closest to the control main board 10. In other words, the relay board 20 closest to the control main board 10 among the multiple relay boards 20 is called the first relay board 20. The first relay board 20 is connected to the control main board 10 via a first communication cable C Cable1. The HVAC system also includes a second communication cable C Cable2, and the multiple relay boards 20 are sequentially connected via the second communication cable C Cable2.

[0073] Multiple relay boards 20 are connected sequentially via the second communication cable C Cable2. It should be understood that two relay boards 20 in the multiple relay boards 20 are sequentially connected via the second communication cable C Cable2. For example, if the number of relay boards n is 4, and relay board 1# is the first relay board, then the control main board is connected to relay board 1# via the first communication cable; relay board 1# is connected to relay board 2# via the second communication cable; relay board 2# is connected to relay board 3# via the second communication cable; and relay board 3# is connected to relay board 4# via the second communication cable. The connection order of the four relay boards can be set as needed, as long as the four relay boards are sequentially connected via the second communication cable C Cable2. For example, in the above embodiment, relay board 1# is connected to relay board 3# via the second communication cable C Cable2; relay board 3# is connected to relay board 4# via the second communication cable C Cable2; and relay board 4# is connected to relay board 2# via the second communication cable C Cable2. It should be noted that Figure 5 The n in is not limited to 4, and n can be a positive integer greater than or equal to 2.

[0074] In this way, the relay board closest to the control mainboard is defined as the first relay board. This first relay board is connected to the control mainboard via the first communication cable C Cable1. Therefore, all other relay boards use the first relay board as a transfer point to communicate with the control mainboard. Defining the relay board closest to the control mainboard as the first relay board reduces the length of the first communication cable and reduces external interference on the first communication cable, thereby improving signal transmission accuracy and efficiency and enhancing communication performance.

[0075] In one embodiment, the plurality of relay boards include a node relay board and a subsequent relay board. The subsequent relay board is a relay board located after the node relay board in the communication line. The number of subsequent relay boards is at least two, and the relay board closest to the node relay board among the at least two subsequent relay boards is connected to the node relay board via a second communication cable C Cable2. Figure 5 In the example, n is 4, and the node relay boards can be relay board 1# and relay board 2#.

[0076] When the node relay board is relay board 1#, the corresponding subsequent relay boards are relay board 2#, relay board 3#, and relay board 4#. The relay board closest to relay board 1# among relay boards 2#, 3#, and 4# is connected to relay board 1# via the second communication cable CCable2. For example, if relay board 2# is the relay board closest to relay board 1#, then relay board 2#, which is closest to relay board 1#, is connected to relay board 1# via the second communication cable C Cable2.

[0077] When the node relay board is relay board 2#, the corresponding subsequent relay boards are relay board 3# and relay board 4#. The relay board closest to relay board 2# among relay boards 3# and 4# is connected to relay board 2# via the second communication cable C Cable2. For example, if relay board 3# is the relay board closest to relay board 2#, then relay board 3#, which is closest to relay board 2#, is connected to relay board 2# via the second communication cable C Cable2.

[0078] For relay board 3#, its subsequent relay board is only relay board 4#, so relay board 4# is connected to relay board 3# through the second communication cable.

[0079] This connection method can optimize the length of each second communication cable, avoid excessively long signal transmission distances between multiple relay boards, further improve the communication transmission performance between multiple relay boards, and further reduce wire costs.

[0080] Typically, a communication socket may be provided on the relay board, and the communication socket is connected to the second communication circuit.

[0081] When the relay board is located at the middle node of the communication line, the relay board (e.g. Figure 5 When relay board 1#, relay board 2#, and relay board 3# need to be connected to two second communication cables C Cable2 or need to be connected to the first communication cable C Cable1 and the second communication cable C Cable2 at the same time, two communication sockets can be set on the relay board 20. The two communication sockets are both connected to the second communication circuit, one communication socket is connected to one communication cable, and the other communication socket is connected to the other communication cable. Alternatively, the two communication cables connected to the relay board 20 use the same communication protocol, and the relay board 20 can be provided with a communication socket, and the two communication cables with the same protocol can both be connected to the communication socket. For example, Figure 5 In the embodiment, the first communication cable C Cable1 and the second communication cable C Cable2 use the same communication protocol. Each relay board 20 is provided with a communication socket, and the two communication cables connected to the relay board 20 are both connected to the communication socket.

[0082] For example, one end of the second communication cable C Cable2 is connected to the second communication circuit and the second power circuit of the corresponding relay board 20, and the other end of the second communication cable C Cable2 is connected to the second communication circuit and the second power circuit of the corresponding relay board 20. The two relay boards 20 connected via the second communication cable C Cable2 also transmit power signals via the second communication cable CCable2. In this way, the second communication cable C Cable2 can adopt carrier technology or LIN bus technology, etc., so that the second communication cable C Cable2 can not only perform communication transmission between the two relay boards 20, but also perform power signal transmission between the two relay boards 20. As a result, only one cable is needed between the two relay boards 20 to achieve communication transmission and power transmission, further reducing the number of cables between the two and reducing costs.

[0083] For example, the second communication cable C Cable2 may also adopt one of the communication protocols such as CAN, RS-232, RS-422, RS-485, etc. The number of core wires of the second communication cable C Cable2 may be determined according to the communication protocol.

[0084] In one embodiment, the first communication cable C Cable1 can be a communication bus. One end of the first communication cable CCable1 can be connected to the first communication circuit. The second communication circuit of the relay board 20 is connected to the first communication cable C Cable1 through a communication adapter line. For example, the second communication circuit of each relay board 20 is connected to the first communication cable C Cable1 through a communication adapter line. The first communication cable C Cable1 can adopt bus technology, so that the first communication cable CCable1 can serve as a communication bus, each relay board 20 is a node of the communication bus, and the communication bus can extend along the arrangement position of the relay board 20. The relay board 20 is connected to the first communication cable C Cable1 through the communication adapter line, and communicates with the control main board 10 through the first communication cable CCable1.

[0085] like Figure 5 As shown, the HVAC system may further include a second power cable P Cable2. The relay board 20 further includes a second power circuit, and the second power circuits of multiple relay boards 20 are sequentially connected via the second power cable P Cable2. One second power cable P Cable2 is connected to the second power circuits of two relay boards 20, respectively. For example, Figure 5In the example, the number n of relay boards 20 is 4. The second power circuit of relay board 1# is connected to the second power circuit of relay board 2# via the second power cable P Cable2; the second power circuit of relay board 2# is connected to the second power circuit of relay board 3# via the second power cable P Cable2; and the second power circuit of relay board 3# is connected to the second power circuit of relay board 4# via the second power cable P Cable2. The connection order of the four relay boards 20 can be set as needed, as long as the four relay boards 20 are connected in sequence via the second communication cable CCable2. Therefore, by only providing power to one of the relay boards 20, power can be provided to all n relay boards 20.

[0086] In one embodiment, the power supply of the relay board 20 may be provided by a power module, and thus the second power supply circuit of at least one relay board 20 among the plurality of relay boards 20 may be connected to the power module. For example, the relay board 20 closest to the power module among the plurality of relay boards 20 may be selected to be connected to the power module, that is, the second power supply circuit of the relay board 20 closest to the power module among the plurality of relay boards 20 is connected to the power module.

[0087] For example, the second power supply circuit of the first relay board 20 is connected to the control main board 10, or the second power supply circuit of the first relay board 20 is connected to the power module. The power supply of the relay board 20 can be provided by the control main board 10 or by the power module.

[0088] When the power supply of the relay board 20 is provided by the control main board 10, the first relay board 20 is the relay board 20 closest to the control main board 10 among the multiple relay boards 20. Setting the second power circuit of the first relay board 20 to be connected to the first power circuit of the control main board 10 can reduce the length of the first power cable P Cable1, further reduce the wire cost, and facilitate wiring.

[0089] When the power supply of the relay board 20 is provided by the power module, the power module can be arranged close to the first relay board 20, thereby reducing the length of the power cable between the first relay board 20 and the power module.

[0090] In one embodiment, the plurality of relay boards 20 include a node relay board 20 and a subsequent relay board 20. The subsequent relay board 20 is a relay board 20 located after the node relay board 20 in the power line, and the number of the subsequent relay boards 20 is at least two. The subsequent relay board 20 can also be understood as a relay board 20 located after the node relay board 20 on the power transmission path. The relay board 20 closest to the node relay board 20 among the at least two subsequent relay boards 20 is connected to the node relay board 20 via a second power cable P Cable2. Figure 5 In the example, n is 4, and the node relay board 20 can be relay board 1# and relay board 2#.

[0091] When node relay board 20 is relay board 1#, the corresponding subsequent relay boards 20 are relay board 2#, relay board 3#, and relay board 4#. The relay board 20 closest to relay board 1# among relay boards 2#, 3#, and 4# is connected to relay board 1# via the second power cable PCable2. For example, if relay board 2# is the relay board closest to relay board 1#, then relay board 2# is connected to relay board 1# via the second power cable P Cable2.

[0092] When the node relay board is relay board 2#, the corresponding subsequent relay boards are relay board 3# and relay board 4#. The relay board closest to relay board 2# among relay board 3# and relay board 4# is connected to relay board 2# via the second power cable. For example, if relay board 3# is the relay board closest to relay board 2#, then relay board 3# is connected to relay board 2# via the second power cable.

[0093] For relay board 3#, its subsequent relay board is only relay board 4#, so relay board 4# is connected to relay board 3# via the second power cable.

[0094] This connection method can optimize the length of each second power cable P Cable2, avoid excessive length of power cables between multiple relay boards 20, further reduce wire costs, and help reduce power consumption between two relay boards 20 and reduce power consumption of the entire product.

[0095] Typically, a power socket may be provided on the relay board 20 , and the power socket is connected to the second power circuit.

[0096] When the relay board is located at an intermediate node of the power supply line, the relay board (e.g. Figure 5 When relay board 1#, relay board 2#, and relay board 3# need to be connected to two second power cables or need to be connected to the first power cable and the second power cable at the same time, two power sockets can be provided on the relay board. Both of the two power sockets are connected to the second power circuit, one of which is connected to one power cable and the other is connected to the other power cable. Alternatively, the relay board 20 can be provided with one power socket, and both of the two power cables connected to the relay board 20 can be connected to the power socket. When the power signal transmitted by the first power cable PCable1 and the second power cable PCable2 is the same, the first relay board 20 can also be provided with one power socket.

[0097] For example, in Figure 5In the embodiment, the first power cable P Cable1 and the second power cable P Cable2 transmit the same power signal. A power socket is provided on the relay board 20. Both power cables connected to the relay board 20 are connected to the power socket, which is connected to the second power circuit.

[0098] The power signal transmitted by the first power cable P Cable1 can be an AC signal or a DC signal. If the operating power required by the load is all DC, the relay board 20 can be directly connected to the control main board 10 via the first power cable P Cable1, and the control main board 10 can provide the operating voltage required by the load. For example, a power module can be set in the electrical control box of the HVAC system, and the power module can include a filter power board and a compressor fan driver board. The first power cable P Cable1 can also be connected to the filter power board or the compressor fan driver board, and the filter power board or the compressor fan driver board supplies power to the relay board 20. The second power circuit on the relay board 20 can have functions such as voltage conversion, voltage stabilization, and filtering, converting the input voltage on the relay board 20 into the operating voltage required by the load. If the relay board 20 is connected to an AC load, the input end of the second power circuit on the relay board 20 can be connected to an AC power source, and the second power circuit can have an AC-DC conversion function to supply power to the AC load and can convert AC power to DC power to supply the DC load. In other embodiments, multiple power cables can be set up as needed. Multiple power cables can provide AC power and DC power to the relay board 20 respectively, and the AC-DC conversion function of the second power supply circuit is no longer required, thereby reducing the cost of the relay board 20.

[0099] Exemplarily, the power module may further include a switching power supply. The switching power supply is a module that can convert alternating current into different voltages. An appropriate switching power supply may be selected as needed.

[0100] It should be noted that Figure 5 In the embodiment, the control main board 10 and the first relay board are connected via a first communication cable C Cable1 and a first power cable P Cable1, and the two relay boards are connected via a second communication cable CCable2 and a second power cable P Cable2. It is understandable that, according to the disclosure, the control main board 10 and the first relay board can be connected via the first communication cable C Cable1, which is used to transmit communication signals and power signals; or the two relay boards can be connected via the second communication cable C Cable2, which is used to transmit communication signals and power signals.

[0101] In one embodiment, the first power circuit and the second power circuit require the same power. The first power cable PCable1 can be a power bus. One end of the power bus can be connected to a power module. The first power circuit of the control mainboard 10 can be connected to the power bus via a first power adapter cable, and the second power circuit of the relay board 20 can be connected to the power bus via a second power adapter cable. Thus, the control mainboard 10 and the relay board 20 are each a node of the power bus. The power bus can extend along the arrangement position of multiple nodes. The power circuit of each node is connected to the power bus via a power adapter cable to obtain the required operating voltage from the power bus.

[0102] In the embodiments of the present disclosure, electrical components include sensors and / or loads. Sensors may include temperature sensors, pressure sensors, humidity sensors, gas sensors, pressure switches, temperature switches, and other detection devices used in HVAC systems. Loads may include two-way valves, four-way valves, electronic expansion valves, electric heaters, compressors, fans in heat exchange modules, and other electronically controlled actuators used in HVAC systems. Sensors and loads are not limited to the devices mentioned above; all sensors and loads used in HVAC systems are considered electrical components in the present disclosure.

[0103] In one embodiment, Figure 3 and Figure 4 As shown, the relay board 20 is connected to at least one sensor and at least one load. In other words, the electrical components connected to the relay board 20 include at least one sensor and at least one load. Thus, the relay board 20 is configured to receive detection signals from the sensors and transmit them to the control board 10 via the first communication cable C Cable1. The relay board 20 is also configured to receive control signals from the control board 10 via the first communication cable C Cable1 and control the load based on the control signals.

[0104] For example, after the control main board 10 receives the detection signal, it can compare the detection signal with the preset signal. When the detection signal does not meet the preset signal, the control main board 10 generates a corresponding control signal and sends the control signal to the corresponding relay board 20 through the first communication cable CCable1, so that the relay board 20 controls the state of the load and thereby realizes control of the HVAC system.

[0105] For example Figure 3 and Figure 4 In the example, relay board 20 is connected to n sensors and p loads. Relay board 20 can be provided with n sensor sockets, each of which plugs into the n sensors. Relay board 20 can also be provided with p load sockets, each of which plugs into the p loads. Therefore, relay board 20 is connected to n+p electrical components. Figure 3 and Figure 4 The types of some sensors and some loads are listed in the table. It is understood that in actual implementation, the types of sensors and loads can be set as needed and are not limited to Figure 3 and Figure 4 The enumeration in .

[0106] After receiving the detection signal, the control mainboard 10 can also display the detection signal so that the user can understand the status of the HVAC system in a timely manner; when the detection signal reaches the early warning signal, the control mainboard 10 can also issue an alarm message.

[0107] The HVAC system may also include an electrical control box, in which the control mainboard 10 and at least one relay board 20 are located. The electrical control box is provided with a maintenance access. When the access is open, both the control mainboard 10 and the relay board 20 are exposed through the access. The electrical control box protects the control mainboard 10 and the relay board 20 located therein, and the maintenance access facilitates maintenance of the control mainboard 10 and the relay board 20.

[0108] Figure 6 This is a schematic diagram of the pipe connections of a HVAC device in a HVAC system according to an embodiment of the present disclosure. Figure 6 The HVAC device shown includes a compressor, a first heat exchange module and a second heat exchange module, and the compressor module, the first heat exchange module and the second heat exchange module are connected through a pipeline. The compressor module drives a heat exchange medium such as a refrigerant to flow between the first heat exchange module and the second heat exchange module. Figure 6 As shown, the HVAC device includes a HVAC circuit, which may include a circuit consisting of a compressor, a first heat exchange module, and a second heat exchange module. The HVAC circuit also includes a four-way valve, which has four pipe interfaces, namely pipe interface A1, pipe interface A2, pipe interface A3, and pipe interface A4. The four-way valve is used to switch the HVAC device between cooling mode and heating mode. Figure 6 For the four-way valve state, the HVAC circuit includes: the outlet of the compressor INV1 → oil separator O / S → one-way valve DXF1 → pipe interface A1 of the four-way valve ST1 → pipe interface A2 of the four-way valve ST1 → the first heat exchange module HR1 → filter GLQ1 → electronic expansion valve EXVA1 → B1 of the subcooler GLQ → B2 of the subcooler GLQ → filter GLQ2 → the second heat exchange module HR2 → filter GLQ3 → pipe interface A4 of the four-way valve ST1 → pipe interface A3 of the four-way valve ST1 → gas-liquid separator ACC → filter GLQ4 → the inlet of the compressor INV1. The first heat exchange module HR1 can be located outdoors, and the second heat exchange module HR2 can be located indoors. In the cooling mode, the connectivity state of the four-way valve ST1 is that A1 is connected to A2, and A4 is connected to A3, such as Figure 6 As shown; in the heating mode, the communication state of the four-way valve ST1 is that A1 is connected to A4, and A2 is connected to A3.

[0109] from Figure 6 It can be seen that in the HVAC circuit, a high-temperature sensor T7C1 and a low-temperature sensor T71 are respectively provided at the outlet and inlet of the compressor INV1; a high-pressure switch HPS1 is provided between the oil separator O / S and the one-way valve DXF1; a high-pressure sensor HP is provided between the one-way valve DXF1 and the pipe interface A1 of the four-way valve ST1; a plurality of temperature sensors T3, T4, and T8 are provided around the first heat exchange module HR1, and a temperature sensor TL is provided between the filter GLQ1 and the electronic expansion valve EXVA1; a temperature sensor T5 is provided between B2 of the subcooler GLQ and the filter GLQ2; a low-pressure sensor LP is provided between the pipe interface A3 of the four-way valve ST1 and the gas-liquid separator ACC. In addition, the loads in the HVAC circuit also include the compressor, the fan of the first heat exchange module HR1, and the fan of the second heat exchange module HR2. It should be noted that the sensors and loads in the HVAC circuit are not limited to Figure 6 As shown in , other sensors and loads can also be set, which will not be listed here one by one. It can be seen that there are many sensors and loads in the HVAC circuit, and their positions are scattered. If all these sensors and loads are directly connected to the control motherboard 10, as shown in Figure 1 That will cause a large number of wires around the control mainboard 10, which is not conducive to the arrangement and bundling of the wires and will result in waste of the wires.

[0110] By adopting the technical solution of the present disclosure, a relay board 20 can be set up in the area where electrical components are concentrated, for example Figure 6 A relay board 20A is set near the first heat exchange module HR1, so that the surrounding sensors and loads can be connected to the relay board 20A, which reduces the wire length of the electrical components, facilitates the connection of the electrical components, and facilitates the arrangement and bundling of the wires.

[0111] In actual implementation, a plurality of temperature sensors, pressure sensors and pressure switches are arranged around the four-way valve ST1. In order to facilitate the connection of electrical components around the four-way valve ST1, at least one relay board 20 is arranged on the four-way valve ST1.

[0112] Figure 7 FIG. 1 is a schematic diagram of a four-way valve provided with a relay plate in an embodiment. Figure 7 As shown, the relay board 20 can be set at the intersection of the four-way valve ST1 pipeline, so that the distance between the relay board 20 and the sensors and loads around the four-way valve ST1 is relatively close, which facilitates the connection of the four-way valve and the surrounding sensors and loads to the relay board 20. In addition, the length of the connecting wires between these sensors and loads and the relay board 20 is shorter, which reduces the wire cost and facilitates the arrangement and bundling of the wires.

[0113] For example, a mounting box 30 may be provided at the intersection of the four-way valve pipelines, and the relay board 20 may be provided in the mounting box 30 .

[0114] like Figure 6 As shown, the HVAC system also includes a pressure relief circuit, which consists of: the outlet of the check valve DXF1 → the solenoid valve SV7 → the inlet of the gas-liquid separator ACC. When the high-pressure sensor HP detects that the pressure in the pipeline is greater than the preset value, the solenoid valve SV7 is controlled to open, the pressure relief circuit is connected, and the heat exchange medium flows through the solenoid valve SV7 to the gas-liquid separator ACC, relieving the pressure in the pipeline between the check valve DXF1 and the pipe interface A1 of the four-way valve ST1.

[0115] The HVAC device also includes an oil discharge circuit, which includes: the oil discharge port of the oil separator O / S → filter GLQ5 → gas-liquid separator ACC, which discharges the oil collected by the oil separator O / S.

[0116] The HVAC device may further include a subcooler GLQ. The subcooler GLQ includes a main circuit and an auxiliary circuit. The main circuit includes a first port B1 and a second port B2, and the auxiliary circuit includes a third port B3 and a fourth port B4. The main circuit of the subcooler GLQ is connected to the HVAC circuit. That is, the first port B1 and the second port B2 of the subcooler GLQ are located in the HVAC circuit.

[0117] The HVAC system also includes an enthalpy-increasing circuit and an auxiliary return air circuit. The enthalpy-increasing circuit includes the auxiliary circuit of the subcooler GLQ and the first solenoid valve SV8A. The auxiliary return air circuit includes the subcooler GLQ and the second solenoid valve SV5. The second port B2 of the subcooler GLQ is also connected to the third port B3 of the subcooler GLQ, and the fourth port B4 of the subcooler is connected to both the first solenoid valve SV8A and the second solenoid valve SV5. The other end of the second solenoid valve SV5 is connected to the inlet of the gas-liquid separator ACC in the HVAC circuit, while the other end of the first solenoid valve SV8A is connected to the enthalpy-increasing port of the compressor in the HVAC circuit. The first and second solenoid valves are connected to the same relay board 20. The relay board 20 is also used to selectively control the conduction of one of the first and second solenoid valves SV8A and SV5 based on control signals received from the control main board 10. In other words, the relay board 20 controls the first solenoid valve SV8A to be turned off and the second solenoid valve SV5 to be turned on, or vice versa.

[0118] like Figure 6 As shown, exemplarily, the enthalpy increase circuit may include: the second port B2 of the subcooler GLQ → the electronic expansion valve EXVC2 → the third port B3 of the subcooler GLQ → the fourth port B4 of the subcooler GLQ → the first solenoid valve SV8A → the enthalpy increase port of the compressor INV1.

[0119] The auxiliary return air loop may include: the fourth port B4 of the subcooler GLQ→the second solenoid valve SV5→the gas-liquid separator ACC.

[0120] For the subcooler GLQ, the temperature of the heat exchange medium becomes lower after flowing from B1 to B2; part of the low-temperature heat exchange medium flowing out of B2 passes through the auxiliary path of the subcooler GLQ to cool the heat exchange medium in the main path.

[0121] During low-temperature heating (i.e., heating when the ambient temperature is very low), the relay board 20 controls the second solenoid valve SV5 to close, the first solenoid valve SV8A to turn on, and the enthalpy increase circuit to turn on according to the received control signal; under other working conditions, the relay board 20 controls the first solenoid valve SV8A to close, the second solenoid valve SV5 to turn on, the subcooler auxiliary return air circuit to turn on, and the heat exchange medium flowing out of B4 of the subcooler GLQ returns to the gas-liquid separator ACC through the second solenoid valve SV5.

[0122] The switching states of the first solenoid valve SV8A and the second solenoid valve SV5 are associated with each other. Setting the first solenoid valve SV8A and the second solenoid valve SV5 to be connected to the same relay board 20 can improve the control accuracy and timeliness of the first solenoid valve SV8A and the second solenoid valve SV5, and avoid the two solenoid valves being turned on or off at the same time due to communication lag.

[0123] As can be seen from the above description of the various circuits in the HVAC system, the sensors and loads in the HVAC system are not limited to the HVAC circuit. Multiple sensors and / or loads are also installed in the pressure relief circuit, enthalpy increase circuit, and auxiliary return air circuit. In actual implementation, more relay boards 20 can be provided as needed to accommodate the connection of more sensors and / or loads.

[0124] It should be noted that Figure 6 The pipe connection method of the HVAC device is only schematically shown. In other embodiments, the pipe connection of the HVAC device can be changed or adjusted as needed, which all falls within the protection scope of the HVAC system disclosed in the present invention.

[0125] In the HVAC system of the disclosed embodiment, when the number of electrical components is large, multiple relay boards 20 can be provided as needed. To allow the control mainboard 10 to distinguish between the relay boards 20 during communication, each relay board 20 can be assigned a unique address. The control mainboard 10 can serve as the communication master, and each relay board 20 can serve as a communication slave with a different address.

[0126] The detection signal can be configured with an address code. When the relay board 20 sends a detection signal to the control main board 10, the detection signal is configured with an address code. Thus, the relay board 20 simultaneously sends the detection signal and the address code corresponding to the relay board 20 to the control main board 10. When the control main board 10 receives the detection signal and the address code, it can identify the source of the detection signal and further monitor the pipeline or environmental status at the corresponding location to generate a corresponding control signal.

[0127] The control signal can also be configured with an address code. When the control main board 10 sends a control signal to the relay board 20, the control signal is configured with the address code corresponding to the relay board 20. Thus, the control signal and the address code are sent to the corresponding destination relay board 20, facilitating the relay board 20 to accurately control the load.

[0128] By configuring the detection signal to be configured to correspond to the address code of the relay board 20 and the control signal to be configured to correspond to the address code of the relay board 20, the accuracy of signal transmission of the first communication cable C Cable1 is improved, and the precision and accuracy of HVAC system control are improved.

[0129] The detection signal is configured with an address code. For example, the detection signal may be set with an identification bit, which is used to set the address code of the relay board 20 ; or, the relay board 20 may simultaneously send the detection signal and the address code to the control main board 10 .

[0130] The control signal is configured with an address code. For example, the control signal may be set with an identification bit, which is used to set the address code of the relay board 20 ; or, the control main board 10 may send the control signal and the address code to the relay board 20 at the same time.

[0131] In the technical solution disclosed herein, the electrical components are no longer connected to the control main board 10, but are connected to the relay board 20. After receiving the acquisition signal of the electrical component, the relay board 20 processes the acquisition signal to generate a detection signal, and then sends the detection signal to the control main board 10 through the first communication cable C Cable1. The first microcontroller unit in the control main board 10 is used to generate a corresponding control signal based on the detection signal received from at least one relay board 20. In this way, the control main board 10 no longer needs to process the acquisition signal of the sensor, saving the resources of the first microcontroller unit in the control main board 10. Therefore, the first microcontroller unit can also be used to perform fault analysis and pre-judgment based on the detection signal and stored data, which is conducive to pre-control of the HVAC system, ensuring the operation of the HVAC system, and improving the safety of the HVAC system operation.

[0132] In the HVAC system disclosed herein, at least two electrical components installed in the HVAC device are no longer directly connected to the control mainboard 10, but are instead connected to a relay board 20. The relay board 20 and the control mainboard 10 are connected via a first communication cable C Cable 1. The relay board 20 calculates and processes the sensor's collected signals to generate a detection signal, which is then transmitted to the control mainboard 10 via the first communication cable C Cable 1. The control mainboard 10 generates a corresponding control signal based on the detection signal and transmits the control signal to the corresponding relay board 20 via the first communication cable C Cable 1, which controls the corresponding load operating state. Each electrical component is connected to the relay board 20, and the distance between the electrical component and the relay board 20 is relatively short. This reduces the length of the connecting wires, facilitates wire organization and bundling, significantly improves wire organization efficiency, and reduces the cost of the electrical components. The greater the capacity of the HVAC system, the more significant the cost reduction. Each electrical component is located near the corresponding relay board 20, reducing the impact of the box size on the length of the electrical component wires. This helps standardize the length of the electrical component wires, lays the foundation for automated wiring and the sealed design of the electrical control box.

[0133] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0134] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0135] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0136] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0137] The disclosure above provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, these are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0138] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any person skilled in the art can easily conceive of various changes or substitutions within the technical scope disclosed in this disclosure. Different parts of different embodiments can be combined with each other without conflict, and all of these should be included in the scope of protection of this disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A HVAC system, characterized in that: include: A HVAC device, comprising a compressor module and at least one first heat exchange module, wherein the compressor module and the at least one first heat exchange module are connected via a pipeline, and the compressor module is used to drive a heat exchange medium to flow at least between the compressor module and the at least one first heat exchange module; A control mainboard, comprising a first communication circuit; at least one relay board, the relay board including a second communication circuit, the relay board being connected to at least two electrical components, the electrical components being provided in the HVAC device; a first communication cable, connected to the first communication circuit and the second communication circuit respectively; The relay board is used to send the detection signal from the corresponding electrical component to the control main board through the first communication cable; and / or, the control main board is used to send a control signal to the relay board through the first communication cable, so that the relay board controls the corresponding electrical component according to the control signal.

2. The HVAC system according to claim 1, characterized in that: The control main board also includes a first power supply circuit, the relay board also includes a second power supply circuit, and the HVAC system also includes a first power supply cable, and the first power supply circuit and the second power supply circuit are connected through the first power supply cable.

3. The HVAC system according to claim 1, characterized in that: The control main board also includes a first power supply circuit, and the relay board also includes a second power supply circuit. The first communication cable is connected to the first communication circuit and the first power supply circuit, and is also connected to the second communication circuit and the second power supply circuit. The control main board and the relay board connected by the first communication cable are also used to transmit power signals through the first communication cable.

4. The HVAC system according to any one of claims 1 to 3, characterized in that: There are multiple relay boards, including a first relay board closest to the control main board, the first relay board is connected to the control main board through the first communication cable, the HVAC system also includes a second communication cable, and the multiple relay boards are connected in sequence through the second communication cable.

5. The HVAC system according to claim 4, characterized in that: The multiple relay boards include a node relay board and a subsequent relay board, the subsequent relay board is a relay board located after the node relay board in the communication line, the number of the subsequent relay boards is at least two, and the relay board closest to the node relay board among the at least two subsequent relay boards is connected to the node relay board through the second communication cable.

6. The HVAC system according to claim 4, characterized in that: The relay board also includes a second power supply circuit, one end of the second communication cable is connected to the second communication circuit and the second power supply circuit of the corresponding relay board, and the other end of the second communication cable is connected to the second communication circuit and the second power supply circuit of the corresponding relay board. The two relay boards connected by the second communication cable also transmit power signals through the second communication cable.

7. The HVAC system according to claim 4, characterized in that: Also includes a second power cable, the relay board also includes a second power circuit, the second power circuits of the plurality of relay boards are connected in sequence through the second power cable, and one second power cable is connected to the second power circuits of two relay boards respectively; The second power supply circuit of the first relay board is connected to the control main board, or the second power supply circuit of the first relay board is connected to the power supply module.

8. The HVAC system according to claim 7, characterized in that: The multiple relay boards include a node relay board and a subsequent relay board, the subsequent relay board is a relay board located after the node relay board in the power line, the number of the subsequent relay boards is at least two, and the relay board closest to the node relay board among the at least two subsequent relay boards is connected to the node relay board through the second power cable.

9. The HVAC system according to claim 4, characterized in that: It also includes a second power cable, and the relay board also includes a second power circuit. The second power circuits of the multiple relay boards are connected in sequence through the second power cable, and the second power circuit of at least one relay board among the multiple relay boards is connected to the power module.

10. The HVAC system according to claim 9, characterized in that: A relay board closest to the power module among the plurality of relay boards is connected to the power module.

11. The HVAC system according to claim 1, characterized in that: The electrical components include sensors and / or loads.

12. The HVAC system according to claim 11, characterized in that: The sensor includes at least one of a temperature sensor, a pressure sensor, a humidity sensor, a gas sensor, a pressure switch, and a temperature switch; The load includes at least one of a two-way valve, a four-way valve, an electronic expansion valve, an electric heater, a compressor, and a fan of a heat exchange module.

13. The HVAC system according to claim 11, characterized in that: The relay board is connected to at least one sensor and at least one load. The relay board is used to receive a detection signal from the sensor, send the detection signal to the control main board through the first communication cable, receive a control signal from the control main board through the first communication cable, and control the load according to the control signal.

14. The HVAC system according to claim 1, characterized in that It also includes an electric control box, in which the control main board and at least one relay board are both located. The electric control box is provided with a maintenance port. When the maintenance port is open, the control main board and the relay board are both exposed through the maintenance port.

15. The HVAC system according to claim 1, characterized in that: The HVAC device includes a HVAC circuit, which includes a four-way valve. The four-way valve is used to switch the HVAC device between a cooling mode and a heating mode. At least one relay plate is arranged on the four-way valve.

16. The HVAC system according to claim 1, characterized in that The HVAC device includes a HVAC circuit, an enthalpy increase circuit and an auxiliary return air circuit. The enthalpy increase circuit includes an auxiliary circuit of a subcooler and a first solenoid valve. The auxiliary return air circuit includes an auxiliary circuit of a subcooler and a second solenoid valve. The auxiliary circuit of the subcooler includes a third port and a fourth port of the subcooler. The first port and the second port of the subcooler are located in the HVAC circuit. The second port is also connected to the third port of the subcooler. The fourth port of the subcooler is connected to both the first solenoid valve and the second solenoid valve. The other end of the second solenoid valve is connected to the inlet of the gas-liquid separator in the HVAC circuit. The other end of the first solenoid valve is connected to the enthalpy increase port of the compressor in the HVAC circuit. The first solenoid valve and the second solenoid valve are connected to the same relay board, and the relay board is also used to selectively control one of the first solenoid valve and the second solenoid valve to be turned on according to a control signal received from the control main board.

17. The HVAC system according to claim 1, characterized in that: There are multiple relay boards, and the distance between multiple electrical components connected to the same relay board and the relay board is less than or equal to a first preset value.

18. The HVAC system according to claim 1, characterized in that: There are multiple relay boards, and at least two relay boards are arranged at different positions.

19. The HVAC system according to claim 1, characterized in that: The first microcontroller unit in the control main board is used to generate a corresponding control signal based on a detection signal received from at least one of the relay boards, and is also used to perform fault analysis and prejudgment based on the detection signal and stored data.

20. The HVAC system according to claim 1, wherein: There are multiple relay boards, each of which is set with a unique address code. The detection signal is configured with the address code, and the control signal is configured with the address code.

21. The HVAC system according to claim 1, characterized in that The first communication cable is a communication bus, and the second communication circuit of the relay board is connected to the first communication cable through a communication adapter line.

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