CN113432258B

CN113432258B - Air conditioning system

Info

Publication number: CN113432258B
Application number: CN202110699152.5A
Authority: CN
Inventors: 刘青健; 何成军; 王泽�; 于浩
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-12-23
Anticipated expiration: 2041-06-23
Also published as: CN113432258A

Abstract

The invention discloses an air conditioning system, which comprises an indoor unit, an outdoor unit and a display device, wherein the indoor unit is connected with the outdoor unit; an outdoor unit circuit board is arranged in the outdoor unit electrical box; the external unit circuit board is configured to perform electrical box filth blockage detection when receiving an electrical box filth blockage detection instruction: controlling the outer fan to rotate at a preset rotating speed; detecting a wind speed value on the surface of an outer machine circuit board in the electric box; judging a dirty and blocked detection result of the electrical box according to the detected wind speed value; after the dirty and blocked detection result is judged by the outer machine circuit board, the display device is controlled to display the dirty and blocked detection result, a user is reminded of cleaning the inside of the electric box in time, the service lives of electronic components and the outer machine circuit board in the electric box are greatly prolonged, normal and reliable operation work of the air conditioning system is guaranteed, maintenance cost is saved, and user experience is improved.

Description

Air conditioning system

Technical Field

The invention relates to the technical field of household appliances, in particular to an air conditioning system.

Background

The outdoor unit of the multi-split air conditioner is usually installed at outdoor positions such as a building roof and a building wall, the working environment is relatively bad, the substrate components inside the outdoor unit electrical box are mainly cooled by air, after long-time operation, a large amount of dust and foreign matters are usually accumulated inside the outdoor unit electrical box and on the surface of the substrate, various abnormal faults such as reduction of insulation degree of the substrate and the electronic components, short circuit between lines, grounding and the like can be caused, and even the danger of electric shock of personnel can be caused. Meanwhile, excessive dust covers the surface of the substrate for a long time, so that the electrostatic current of the substrate is too high under the condition of air humidity, the electronic components are corroded, and the service life of the electronic components is greatly shortened.

At present, dust and foreign matter detection is carried out on an outdoor unit electrical box in an effective mode temporarily absent in the industry, and replacement of a whole substrate spare part is only carried out after a fault occurs.

The substrates in the electric box are directly replaced after the substrates are broken down, and the mode has high maintenance cost and serious resource waste.

Disclosure of Invention

In order to solve the problem that dust detection cannot be performed on the outdoor unit circuit board in an effective mode in the prior art, the invention provides the air conditioning system.

In order to achieve the purpose, the invention adopts the following technical scheme:

the present invention provides an air conditioning system comprising:

an indoor unit;

the outdoor unit comprises an external fan and an electric box; an outer machine circuit board is arranged in the electric box;

the display device displays according to a control command of the external unit circuit board;

the external unit circuit board is configured to perform electrical box filth blockage detection when receiving an electrical box filth blockage detection instruction: controlling the outer fan to rotate at a preset rotating speed; detecting a wind speed value on the surface of an outer machine circuit board in the electric box; judging a detection result of filth blockage of the electrical box according to the detected wind speed value;

and after judging the filth blockage detection result, the outer machine circuit board controls the display device to display the filth blockage detection result.

Further, the determining a detection result of the electrical box filth blockage according to the detected wind speed value specifically includes:

calculating the absolute value of the difference value delta V of the detected wind speed value V1 and a calibrated value Vs = | Vs-V1|;

if the delta V is smaller than the first threshold value, judging that the electrical box filth blockage detection result is no filth blockage;

if the second threshold value is more than or equal to the delta V and more than or equal to the first threshold value, judging that the electrical box filth blockage detection result is light filth blockage;

if the third threshold value is more than or equal to delta V and more than the second threshold value, judging that the electrical box filth blockage detection result is moderate filth blockage;

if delta V is larger than a third threshold value, judging that the electrical box filth blockage detection result is severe filth blockage;

wherein the first threshold value is less than the second threshold value and less than the third threshold value.

Still further, a plurality of outdoor units are arranged, one of the outdoor units is selected as a master machine, and the other outdoor units are slave machines; the external machine circuit board of the host machine is communicated with the external machine circuit board of each slave machine;

the indoor units are provided with a plurality of indoor units, each indoor unit is provided with an indoor unit circuit board, and each indoor unit circuit board is communicated with an outdoor unit circuit board of the host machine respectively;

the display devices are arranged in a plurality and are in one-to-one correspondence communication with the inner machine circuit boards;

when the external machine circuit board of the host machine receives the filth blockage detection instruction, the filth blockage detection instruction is sent to the external machine circuit board of each slave machine, and filth blockage detection is carried out on the electrical box of the host machine to obtain a filth blockage detection result of the electrical box of the host machine;

when an external machine circuit board of each slave machine receives a filth blockage detection instruction, filth blockage detection is carried out on an electrical box of the slave machine; the outer machine circuit board of each slave machine sends the dirty and blocked detection result of the electrical box to the outer machine circuit board of the host machine;

the method comprises the steps that an outer machine circuit board of a host machine sends an electrical box dirty and blocked detection result of the host machine and an electrical box dirty and blocked detection result of each slave machine to an inner machine circuit board of each indoor machine;

and when the internal machine circuit board of each indoor machine receives the dirty and blocked detection result of the electrical box, sending a control instruction to the corresponding display device, and controlling the corresponding display device to display the dirty and blocked detection result.

Furthermore, the display device comprises one or more of a display screen on the wire controller, a display screen on the remote controller and a display screen on the front panel of the indoor unit.

Furthermore, a fan control module, a wind speed detection module and a main controller are arranged on the outer machine circuit board;

the fan control module is used for controlling the outer fan to rotate at a preset rotating speed when receiving a detection instruction sent by the main controller;

the wind speed detection module is used for detecting a wind speed value on the surface of an outer machine circuit board in the electric box when receiving a detection instruction sent by the main controller and sending the detected wind speed value to the main controller;

the main controller sends a detection instruction to the fan control module and the wind speed detection module when receiving an electrical box filth blockage detection instruction, and judges an electrical box filth blockage detection result according to a received wind speed value sent by the wind speed detection module; and sending a control instruction to the display device to control the display device to display the filth blockage detection result.

Furthermore, an air inlet and an air outlet are formed on a box body of the electrical box, and an installation cavity is formed in the box body; the mounting cavity is communicated with the air inlet and the air outlet; the outer machine circuit board is arranged in the mounting cavity;

the wind speed detection module comprises:

the air-gathering shell is provided with an air-gathering inlet facing the air inlet of the electrical box and an air-gathering outlet facing the air outlet of the electrical box; an air gathering air channel communicated with the air gathering inlet and the air gathering outlet is formed in the air gathering shell;

the wind speed sensor comprises a wind speed sensing chip and a PCB, the wind speed sensing chip is installed on the PCB and is electrically connected with a first interface of the PCB, the first interface of the PCB is electrically connected with a second interface of the PCB, the PCB is installed on the external machine circuit board, and the second interface of the PCB is electrically connected with the main controller;

the wind gathering shell is fixedly connected with the PCB, and the wind speed sensing chip is located in the wind gathering air channel and used for collecting a wind speed value.

Still further, an amplifying circuit is arranged on the PCB; and the first interface of the PCB is connected with the second interface of the PCB through the amplifying circuit.

Furthermore, a microcontroller is arranged on the PCB; the input end of the microcontroller is connected with the output end of the amplifying circuit;

the second interface of the PCB comprises a TXD pin and an RXD pin; the output end of the microcontroller is connected with a TXD pin, and the input end of the microcontroller is connected with an RXD pin;

the TXD pin is connected with the input end of the main controller;

the RXD pin is connected with the output end of the main controller.

Still further, the wind speed detection module further comprises an installation structure, the installation structure comprises an installation groove, and the wind gathering shell and the wind speed sensor are installed in the installation groove;

a front vent hole is formed on the front wall of the mounting groove at a position corresponding to the wind gathering inlet;

a rear vent hole is formed in the groove rear wall of the mounting groove at a position corresponding to the air gathering outlet;

a threading hole is formed in the wall of the mounting groove, and a cable penetrates through the threading hole to connect the second interface of the PCB and the main controller.

Furthermore, the mounting structure further comprises a cover plate, and the cover plate is covered on the notch of the mounting groove and detachably connected with the mounting groove.

Compared with the prior art, the technical scheme of the invention has the following technical effects: according to the air conditioning system, when the outer machine circuit board receives the electrical box filth blockage detection instruction, the electrical box filth blockage detection is carried out: controlling the outer fan to rotate at a preset rotating speed; detecting a wind speed value on the surface of an outer machine circuit board in the electric box; judging a detection result of filth blockage of the electrical box according to the detected wind speed value; the outer machine circuit board sends a control instruction to the display device after judging the filthy and blockage detection result of the electrical box, the display device displays the filthy and blockage detection result according to the received control instruction, a user is reminded of cleaning the inside of the electrical box in time, the service lives of electronic components and the outer machine circuit board in the electrical box are greatly prolonged, normal and reliable operation of an air conditioning system is guaranteed, maintenance cost is saved, and user experience is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic block diagram of an air conditioning system according to an embodiment of the present invention;

FIG. 2 is a schematic block diagram of an air conditioning system according to another embodiment of the present invention;

FIG. 3 is a flow chart of a dirty block detection process for the air conditioning system of the present invention;

FIG. 4 is a flow chart of yet another dirty block detection process for the air conditioning system of the present invention;

FIG. 5 is a schematic block circuit diagram of an embodiment of an outer unit circuit board of the air conditioning system of the present invention;

FIG. 6 is a schematic block circuit diagram of a wind speed sensor of the wind speed detection module of FIG. 5;

FIG. 7 is a schematic diagram of an electrical enclosure of an air conditioning system according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an embodiment of a PCB board of a wind speed detection module of an air conditioning system according to the present invention;

FIG. 9 is a schematic structural diagram of another embodiment of a PCB board of a wind speed detection module of an air conditioning system according to the present invention;

fig. 10 is a schematic structural view of an installation structure of a wind speed detection module of an air conditioning system according to the present invention.

Reference numerals:

1. an outer unit circuit board;

2. a wind speed detection module;

2-1, a wind speed sensor; 2-1-1, a wind speed sensing chip; 2-1-2, a PCB board;

2-2, a wind gathering shell; 2-2-1, left side plate; 2-2-2, right side panel; 2-2-3, a top plate; 2-2-4, a front panel; 2-2-5, wind gathering inlet;

2-3, mounting a structure;

2-3-1, mounting groove; 2-3-1-1, front vent;

2-3-2, a cover plate;

2-3-3, a cable;

2-3-4, folding; 2-3-4-1, screw holes;

2-3-5 and screws.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The air conditioning system performs a refrigeration cycle and a heating cycle of the air conditioning system by using a compressor, a condenser, an expansion valve, and an evaporator, performs control by a controller, realizes flow direction control of refrigerant, opening degree control of the expansion valve, and the like. The refrigerating cycle and the heating cycle include a series of processes involving compression, condensation, expansion, and evaporation, and supply refrigerant to the air that has been conditioned and heat-exchanged.

The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioning system may regulate the temperature of the indoor space throughout the cycle.

The air conditioning system outdoor unit refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the air conditioning system indoor unit includes an indoor heat exchanger, and an expansion valve may be provided in the air conditioning system outdoor unit or the indoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioning system is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioning system is used as a cooler in a cooling mode.

The air conditioning system of the present embodiment includes an indoor unit, an outdoor unit, and a display device, and the indoor unit and the outdoor unit form a refrigerant circulation system, as shown in fig. 1.

The indoor unit comprises an indoor unit circuit board which controls the operation of the whole indoor unit.

The outdoor unit comprises an external fan and an electric box; an outer machine circuit board is arranged in the electric box; and the outer machine circuit board controls the operation of the outer fan and the whole outdoor machine. The outer machine circuit board and the inner machine circuit board are communicated through an H-Link.

And the display device receives the control command of the outer machine circuit board and displays the control command according to the control command of the outer machine circuit board.

Under the condition that the outer fan rotates at the preset rotating speed V, the wind speed on the surface of the outer motor circuit board is related to the dust and foreign matter accumulation condition on the surface of the outer motor circuit board. If the dust and foreign matters on the surface of the outer machine circuit board are seriously accumulated, the wind speed on the surface of the outer machine circuit board is small; if the surface of the outer motor circuit board is clean, the wind speed on the surface of the outer motor circuit board is high. Therefore, the dirty blocking condition of the surface of the outer machine circuit board can be judged according to the wind speed of the surface of the outer machine circuit board.

Thus, the external electrical box circuit board is configured to perform electrical box filth detection upon receiving an electrical box filth detection instruction: controlling the outer fan to rotate at a preset rotating speed V; when the outer fan rotates at a preset rotating speed V, detecting a wind speed value V1 on the surface of an outer machine circuit board in the electric box; and judging the electrical box filth blockage detection result according to the detected wind speed value V1. And after judging the filth blockage detection result, the outer machine circuit board controls the display device to display the filth blockage detection result.

The outer motor circuit board sends a control instruction to the display device after judging the dirty and blocked detection result of the electrical box, the display device displays the dirty and blocked detection result according to the received control instruction, a user is timely reminded of cleaning the inside of the electrical box, the service lives of electronic components and the outer motor circuit board in the electrical box are greatly prolonged, normal and reliable operation work of an air conditioning system is guaranteed, maintenance cost is saved, and user experience is improved.

The outer printed circuit board includes a substrate, and chips and electronic components on the substrate.

The air conditioning system of this embodiment can effectively detect the dirty stifled degree of dust foreign matter on outer quick-witted circuit board surface in the electric box to remind the user in time to clean, improve electronic components's life, practice thrift the cost of maintenance of changing outer quick-witted circuit board spare part, guarantee the normal reliable operation work of air conditioning system.

In this embodiment, the determining the electrical box filth blockage detection result according to the detected wind speed value V1 specifically includes the following steps:

(11) And calculating the absolute value delta V of the difference value between the detected wind speed value V1 and the calibrated value Vs = | Vs-V1|.

The calibration value Vs is an average value of multiple measurements of the outdoor unit under various working conditions of a laboratory and under the condition that the rotating speed of the fixed external fan is a preset rotating speed V, and the measurement value is a standard wind speed detection value of the outdoor unit electrical box under the condition of no dust or dirt and foreign matters.

(12) And judging a filth blockage detection result according to the relation between the delta V and the first threshold alpha, the second threshold beta and the third threshold gamma. The first threshold value alpha, the second threshold value beta and the third threshold value gamma are preset target filth degree threshold values. First threshold < second threshold < third threshold.

And if the delta V is smaller than the first threshold value, the outer machine circuit board judges that the electrical box dirty blockage detection result is dirty blockage-free and does not need cleaning.

And if the second threshold value is more than or equal to the delta V and more than or equal to the first threshold value, the outer machine circuit board judges that the electrical box filth blockage detection result is light filth blockage.

And if the third threshold value is more than or equal to delta V and more than the second threshold value, the outer machine circuit board judges that the electrical box filth blockage detection result is moderate filth blockage.

And if the delta V is larger than a third threshold value, the outer machine circuit board judges that the electrical box filth blockage detection result is severe filth blockage.

Through the design of the above (11) and (12), the visceral congestion detection result is judged according to the magnitude relation between the delta V and the three thresholds, the judgment is accurate, and a relatively accurate detection result can be obtained; the electrical box has four filth blockage detection results, namely no filth blockage, light filth blockage, medium filth blockage and heavy filth blockage, and a user can timely take proper cleaning measures according to the filth blockage degree.

When the indoor units are provided in plurality and the outdoor units are provided in plurality, the air conditioning system of the embodiment is a multi-split air conditioning system. The outdoor units are multiple, one of the outdoor units is selected as a host, and the other outdoor units are slaves; the outer machine circuit board of the master machine is communicated with the outer machine circuit board of each slave machine. The indoor units are provided with a plurality of indoor units, each indoor unit is provided with an indoor unit circuit board, and each indoor unit circuit board is communicated with the outdoor unit circuit board of the host machine respectively. The display devices are provided in plurality, and the plurality of display devices are connected and communicated with the plurality of internal machine circuit boards in a one-to-one correspondence manner, as shown in fig. 2.

The visceral congestion detection procedure comprises the following steps, which are shown in fig. 3.

S11: a user sends an electrical box filth blockage detection instruction to an indoor unit circuit board of the indoor unit through a control panel on a front panel of the indoor unit, or a remote controller, or a line controller.

S12: and when the inner machine circuit board receives the electrical box filth blockage detection instruction, the inner machine circuit board sends the filth blockage detection instruction to the outer machine circuit board of the host machine.

S13: when the external machine circuit board of the host machine receives the filth blockage detection instruction, the filth blockage detection instruction is sent to the external machine circuit board of each slave machine; and the external machine circuit board of the host machine carries out filth blockage detection on the electrical box of the host machine to obtain a filth blockage detection result of the electrical box of the host machine.

S14: when an outer machine circuit board of each slave machine receives a filth blockage detection instruction, performing filth blockage detection on an electrical box of the slave machine; and the outer machine circuit board of each slave machine sends the dirty and blocked detection result of the electrical box to the outer machine circuit board of the host machine.

S15: and the external machine circuit board of the host machine sends the dirty and blocked detection result of the electrical box of the host machine and the dirty and blocked detection result of the electrical box of each slave machine to the internal machine circuit board of each indoor machine.

S16: when the inner machine circuit board of each indoor machine receives the dirty and blocked detection result of the electrical box, a control instruction is sent to the corresponding display device, the corresponding display device is controlled to display the dirty and blocked detection result of all outdoor machines, a user is timely reminded of cleaning the interior of the electrical box through the display device, the service lives of electronic components and the outer machine circuit board in the electrical box are greatly prolonged, normal and reliable operation work of an air conditioning system is guaranteed, maintenance cost is saved, and user experience is improved.

Therefore, in the multi-split air conditioning system, the host issues the received detection instruction to each slave, the host and all the slaves perform filth blockage detection, all the slaves send filth blockage detection results to the host, the host sends the filth blockage detection results of all the outdoor units to each indoor unit, and each indoor unit controls the corresponding display device to display the filth blockage detection results of all the outdoor units so as to remind a user of cleaning an electrical box in time, reduce maintenance cost and ensure normal and reliable operation of the multi-split air conditioning system.

In this embodiment, display device includes one or more in display screen on the drive-by-wire ware, the display screen on the remote controller, the display screen on the indoor set front panel, not only can show filth stifled testing result in multiple ways, and the user is reminded in the aspect of the full aspect in time to carry out the inside cleanness of electric box, moreover, utilizes the display screen of air conditioning system itself to show testing result, and the cost is lower.

In this embodiment, a fan control module, a wind speed detection module, a main controller, a communication module, etc. are disposed on the external circuit board in the electrical box, as shown in fig. 5.

And the fan control module is used for controlling the outer fan to rotate at a preset rotating speed V when receiving the detection instruction sent by the main controller.

And the wind speed detection module is used for detecting a wind speed value on the surface of an outer machine circuit board in the electric box when receiving a detection instruction sent by the main controller and the outer fan rotates at a preset rotating speed V, and sending the detected wind speed value to the main controller.

The main controller sends a detection instruction to the fan control module and the wind speed detection module when receiving the electrical box filth blockage detection instruction, and judges an electrical box filth blockage detection result according to a received wind speed value sent by the wind speed detection module; and sending a control instruction to a display device to control the display device to display the filth blockage detection result.

And the communication module on the outer machine circuit board comprises an outdoor-outdoor communication module and an outdoor-indoor communication module which are respectively connected with the main controller. The outdoor-outdoor communication module is used for communicating with other outdoor units; and the outdoor-indoor communication module is used for communicating with the indoor unit.

Through set up fan control module, wind speed detection module, main control unit on outer quick-witted circuit board, the spatial layout of the circuit board of being convenient for has reduced the space and has taken up, and each module divides the worker clearly, has realized that electric box is dirty stifled to be detected.

The inner machine circuit board is provided with a controller, a communication module and the like, as shown in fig. 2. And the communication module on the internal machine circuit board comprises an outdoor-indoor communication module and an indoor-line controller communication module which are respectively connected with the controller. An outdoor-indoor communication module for communicating with an outdoor unit; and the indoor-wire controller communication module is used for communicating with the wire controller.

The outdoor-outdoor communication module, the outdoor-indoor communication module and the indoor-line controller communication module are H-Link communication modules which respectively realize H-Link communication between the outdoor unit and the outdoor unit, between the outdoor unit and the indoor unit and between the indoor unit and the line controller.

Through installing wind speed detection module on the outer quick-witted circuit board of electric box, the condition is piled up to the dust foreign matter that can effectively detect circuit board surface to carry out dirty stifled judgement through main control unit, in time remind the user to carry out the cleanness of electric box through display device, improved electronic components's life greatly, guaranteed air conditioning system normal reliable operation work, practice thrift cost of maintenance, promote user experience and feel.

The process of detecting the filth blockage comprises the following steps: when the outdoor unit runs for a period of time, a user can select to enter an outdoor unit electrical box dirty-blockage detection mode on the online controller, the online controller can firstly transmit a detection instruction to the indoor unit and then transmit the detection instruction to the outdoor unit host, under the condition that a plurality of outdoor unit modules are combined, the outdoor unit host can transmit the detection instruction to each outdoor unit slave in the system, all the outdoor units which receive the detection instruction start to enter the electrical box dirty-blockage detection mode, at the moment, the rotating speed of an outdoor unit external fan is limited to a set rotating speed V, the wind speed detection module starts to detect the actual air flow rate on the surface of the substrate, the actual detected wind speed value V1 and a calibration value Vs are subjected to absolute difference operation, an operation result delta V is compared with three thresholds, the dirty-blockage degree of the electrical box at the moment is judged, the judgment detection result is transmitted to the outdoor unit and the online controller, and the online controller carries out outdoor unit electrical box dirty-blockage degree information prompt through a display screen.

As shown in fig. 4, when there are a plurality of outdoor units, the filth blockage detection process is as follows: in the normal operation process of the multi-split air conditioning system, a user selects a dirty and blocked detection mode of an electric box of an outdoor unit from a wire controller, then the wire controller transmits a detection instruction to the indoor unit through an indoor-wire controller communication module, the indoor unit receives the detection instruction and then transmits the detection instruction to an outdoor unit host through an indoor-outdoor communication module, and the outdoor unit host transmits the detection instruction to all outdoor unit slave machines (such as a No. 1 slave machine and a No. 2 slave machine in the figure 2) in the system through the outdoor-outdoor communication module. After receiving the electrical box filth blockage detection instruction, all the outdoor units start to carry out speed regulation on the external fans, the rotating speed of the external fans of all the outdoor units is controlled to reach a preset rotating speed V, after the time t, the rotating speed of the external fans reaches a stable state (the rotating speed reaches V), and the miniature wind speed detection modules on the circuit boards of the outdoor units detect the wind speed value V1 on the surface of the substrate at the moment and transmit the wind speed value to the main controller through the UART communication circuit. And the main controller calculates the absolute value delta V of the difference value between the wind speed value V1 and the calibration value Vs = | Vs-V1|. And comparing and judging the delta V with target filth blockage degree thresholds alpha, beta and gamma, and judging a filth blockage detection result. After the electrical box is detected and judged, all the outdoor unit slave machines transmit detection results to the outdoor unit host machine for information gathering, the outdoor unit host machine uniformly transmits the gathered detection results to the indoor unit, and then the indoor unit transmits the gathered detection results to the line controller. And finally, displaying and reminding the detection result of the dirty blockage degree of each outdoor unit by the wire controller, so that the process of detecting the dirty blockage of the outdoor unit electrical box is completed.

In this embodiment, an air inlet and an air outlet are formed on a box body of the electrical box, and an installation cavity is formed in the box body; the mounting cavity is communicated with the air inlet and the air outlet; the outer machine circuit board 1 is installed in the installation cavity. Wind enters the installation cavity from the air inlet of the electric box and then is blown out from the air outlet of the electric box, so that heat of all components in the installation cavity is dissipated.

A wind speed detection module 2 mounted on the outer machine circuit board 1; the wind speed value of the surface of the outer motor circuit board 1 is detected and transmitted to the main controller, as shown in fig. 7.

The wind speed detection module 2 comprises a wind gathering shell 2-2 and a wind speed sensor 2-1, which is shown in fig. 8.

The air gathering shell 2-2 is provided with an air gathering inlet 2-2-5 facing the air inlet of the electric box and an air gathering outlet facing the air outlet of the electric box; an air-gathering air channel communicated with an air-gathering inlet 2-2-5 and an air-gathering outlet is formed in the air-gathering shell 2-2. The installation position of the wind gathering shell 2-2 needs to ensure that the direction of the wind gathering inlet 2-2-5 is consistent with the flowing wind direction in the electric box, so that the wind speed detection result is more accurate and effective.

The wind speed sensor 2-1 comprises a wind speed sensing chip 2-1-1 and a PCB 2-1-2, wherein the PCB 2-1-2 is provided with a first interface and a second interface; the wind speed sensing chip 2-1-1 is installed on the PCB 2-1-2 and electrically connected with a first interface of the PCB 2-1-2, the first interface of the PCB 2-1-2 is electrically connected with a second interface of the PCB 2-1-2, the PCB 2-1-2 is installed on an external machine circuit board, and the second interface of the PCB 2-1-2 is electrically connected with the main controller. The wind speed sensing chip 2-1-1 collects a wind speed value and sends the collected wind speed value to a main controller on an external unit circuit board through the PCB 2-1-2.

The wind gathering shell 2-2 is fixedly connected with the PCB 2-1-2, and the wind speed sensing chip 2-1-1 is positioned in the wind gathering air duct to collect a wind speed value. The wind speed sensor 2-1 is an MEMS (micro electro mechanical system) wind speed sensor, and thus the wind speed detection module 2 is a micro wind speed detection module.

Specifically, the wind gathering shell 2-2 is provided with a left side plate 2-2-1, a right side plate 2-2-2, a top plate 2-2-3, a front panel 2-2-4 and a rear panel; the bottom end of the left side plate 2-2-1 and the bottom end of the right side plate 2-2-2 are fixed with the front face of the PCB 2-1-2, the top end of the left side plate 2-2-1 and the top end of the right side plate 2-2-2 are fixed with the top plate 2-2-3, the front end of the left side plate 2-2-1, the front end of the right side plate 2-2-2 and the front end of the top plate 2-2-3 are fixed with the front panel 2-2-4, the rear end of the left side plate 2-2-1, the rear end of the right side plate 2-2-2 and the rear end of the top plate 2-2-3 are fixed with the rear panel. The front panel 2-2-4 faces the air inlet of the electrical box, the rear panel faces the air outlet of the electrical box, the front panel 2-2-4 is provided with an air gathering inlet 2-2-5, and the rear panel is provided with an air gathering outlet.

Wind enters the box body mounting cavity from the air inlet of the electrical box, then enters the wind gathering air channel through the wind gathering inlet 2-2-5, flows through the wind speed sensing chip 2-1-1, then flows out from the wind gathering outlet, and finally flows out of the box body mounting cavity from the air outlet of the electrical box. The wind gathering shell 2-2 plays a role in gathering wind, so that the wind speed sensing chip 2-1-1 can conveniently acquire a wind speed value, and the accuracy of wind speed detection is improved.

The PCB 2-1-2 has the functions of fixedly mounting the wind speed sensing chip 2-1-1 and the wind gathering shell 2-2, and the first interface and the second interface of the PCB 2-1-2 have the functions of electrically connecting the wind speed sensing chip 2-1-1 with the main controller. The wind speed sensing chip 2-1-1 senses a wind speed value, transmits the sensed wind speed value to a first interface of the PCB 2-1-2, then transmits the wind speed value to a second interface of the PCB 2-1-2, and transmits the wind speed value to the main controller through the second interface.

The wind speed sensing chip 2-1-1 is installed on the front surface of the PCB 2-1-2, the first interface is arranged on the front surface of the PCB 2-1-2, and the second interface is arranged on the back surface of the PCB 2-1-2, as shown in FIG. 8; or, the wind speed sensing chip 2-1-1, the first interface and the second interface are all arranged on the front surface of the PCB 2-1-2, as shown in fig. 9.

In order to improve the integration level of the wind speed sensor 2-1, an amplifying circuit is arranged on the PCB 2-1-2 of the wind speed sensor 2-1, as shown in FIG. 6; the first interface of the PCB 2-1-2 is connected with the second interface of the PCB 2-1-2 through the amplifying circuit. The wind speed sensing chip 2-1-1 transmits the sensed wind speed value to a first interface of the PCB 2-1-2, then transmits the wind speed value to an amplifying circuit for signal amplification, and the amplified signal is transmitted to a second interface of the PCB 2-1-2 and transmitted to the main controller through the second interface. The sensed wind speed value is amplified through the amplifying circuit, so that the accuracy of the visceral congestion judgment can be improved.

In order to improve the intelligence of the wind speed sensor 2-1, a microcontroller is further disposed on the PCB 2-1-2 of the wind speed sensor 2-1, as shown in fig. 6, the first interface is connected to an input end of the amplifying circuit, and an input end of the microcontroller is connected to an output end of the amplifying circuit; the second interface of the PCB comprises a TXD pin and an RXD pin; the output end of the microcontroller is connected with the TXD pin, and the input end of the microcontroller is connected with the RXD pin; the TXD pin is connected with the input end of the main controller; the RXD pin is connected with the output end of the main controller.

The wind speed sensor 2-1 is integrated with a wind speed sensing chip 2-1-1, an amplifying circuit and a microcontroller, the wind speed sensing chip 2-1-1 transmits a sensed wind speed value to a first interface of the PCB 2-1-2, then transmits the wind speed value to the amplifying circuit for signal amplification, the amplified signal is transmitted to the microcontroller, the microcontroller processes the received signal and transmits the processed signal to a TXD pin of a second interface, and the processed signal is transmitted to the main controller through the TXD pin.

A control signal sent by the main controller is transmitted to the RXD pin of the second interface, and is transmitted to the microcontroller through the RXD pin, and the microcontroller operates according to the received signal, as shown in fig. 5.

In order to facilitate the control of the main controller on the wind speed sensor 2-1, the outer machine circuit board 1 is provided with a switch circuit; the output end of the main controller is connected with the control end of the switch circuit; the direct current power supply is connected with the RXD pin of the second interface through a switch path of the switch circuit. The main controller controls the on-off of the switch circuit, so that the level of an RXD pin of a second interface of the PCB 2-1-2 is controlled, and the micro controller realizes corresponding functions according to the level.

In the embodiment, in order to further facilitate the control of the main controller on the wind speed sensor 2-1, the switching circuit comprises a first switching tube Q1 and a second switching tube Q2; the output end of the main controller is connected with the control end of a first switch tube Q1, one end of a switch path of the first switch tube Q1 is grounded, and the other end of the switch path of the first switch tube Q1 is connected with a direct-current power supply through a first pull-up resistor R2; the other end of the switch path of the first switch tube Q1 is connected with the control end of the second switch tube Q2 through the connection node of the first pull-up resistor R2, one end of the switch path of the second switch tube Q2 is grounded, and the other end of the switch path of the second switch tube Q2 is connected with the direct-current power supply through the second pull-up resistor R3; the other end of the switch path of the second switch tube Q2 is connected with the connection node of the second pull-up resistor R3 to the RXD pin of the second interface. In the present embodiment, Q1 and Q2 are both NPN transistors.

When the output end of the main controller sends out a high level, the Q1 is conducted, the control end of the Q2 is a low level, the Q2 is turned off, and the RXD pin of the second interface is pulled to be a high level.

When the output end of the main controller sends out a low level, Q1 is turned off, the control end of Q2 is a high level, Q2 is turned on, and the RXD pin of the second interface is pulled to be a low level.

And a TXD pin of the second interface is connected with the cathode of the LED1, and the anode of the LED1 is connected with a direct current power supply through a current limiting resistor R4. When the TXD pin of the second interface sends out low level, the LED1 is bright; when the TXD pin of the second interface sends out high level, the LED1 is turned off; thus, LED1 is used to indicate whether data transfer is occurring between the TXD pin of the second interface and the host controller.

The switch circuit, the LED1 and the like form a UART communication circuit, a hardware circuit connection relation is established between the wind speed detection module and the main controller through the UART communication circuit, after the wind speed detection module enters an electrical box filth blockage detection mode, the wind speed value detected at the moment is transmitted to the main controller of the outer machine circuit board through the UART communication circuit by the wind speed detection module, the main controller performs absolute difference value operation with a calibration value Vs after receiving the wind speed value V1 and judges filth blockage degree at the moment, then the judgment result is transmitted to the inner machine circuit board through the outdoor-indoor communication module, and finally, the wire controller realizes display and reminding of filth blockage degree detection results.

In this embodiment, in order to facilitate installation and fixation of the wind speed detection module 2, the wind speed detection module 2 further includes an installation structure 2-3, as shown in fig. 10, the installation structure 2-3 includes an installation groove 2-3-1, and the wind gathering shell 2-2 and the wind speed sensor 2-1 are installed in the installation groove 2-3-1; the mounting structure 2-3 is mounted on an outer machine circuit board or other equipment needing to detect wind speed.

A front vent hole 2-3-1-1 is formed on the front wall of the mounting groove 2-3-1 at a position corresponding to the wind gathering inlet 2-2-5, and wind enters the wind gathering inlet 2-2-5 through the front vent hole 2-3-1-1.

A rear vent hole is formed in the position, corresponding to the wind gathering outlet, on the groove rear wall of the mounting groove 2-3-1, and wind flows to the rear vent hole through the wind gathering outlet.

The groove wall (the groove front wall or the groove rear wall) of the mounting groove 2-3-1 is provided with a threading hole for threading the cable 2-3-3, and the cable 2-3-3 penetrates through the threading hole and is used for connecting the second interface of the PCB 2-1-2 with the main controller.

By designing the mounting structure 2-3, the wind speed detection module is convenient to mount, the application range of the wind speed detection module is expanded, and the wind speed sensor 2-1 and the wind gathering shell 2-2 are convenient to protect.

In order to further improve the safety of the wind speed sensor 2-1 and the wind gathering shell 2-2, the mounting structure 2-3 further comprises a cover plate 2-3-2, the cover plate 2-3-2 covers the notch of the mounting groove 2-3-1, the cover plate 2-3-2 is detachably connected with the mounting groove 2-3-1, for example, the cover plate 2-3-2 is connected with the mounting groove 2-3-1 through a screw 2-3-5, and the wind speed sensor 2-1 and the wind gathering shell 2-2 are firmly mounted in the mounting groove 2-3-1.

The edge of the notch of the mounting groove 2-3-1 is provided with a folded edge 2-3-4, and the folded edge 2-3-4 is provided with a screw hole 2-3-4-1, so that the wind speed detection module can be conveniently mounted on an outer machine circuit board or other equipment needing wind speed detection.

As another preferred design of this embodiment, an amplifying circuit may also be disposed on the external unit circuit board 1, and the second interface of the PCB 2-1-2 is electrically connected to the main controller through the amplifying circuit. The signals output by the wind speed sensor 2-1 are amplified by the amplifying circuit and then transmitted to the main controller, so that the accuracy of filth blockage judgment can be further improved.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air conditioning system comprising:

an indoor unit;

the outdoor unit comprises an external fan and an electric box; an external machine circuit board is arranged in the electric box;

it is characterized by also comprising

after judging the filth blockage detection result, the outer machine circuit board controls the display device to display the filth blockage detection result;

the outdoor units are multiple, one of the outdoor units is selected as a host machine, and the other outdoor units are slave machines; the external machine circuit board of the host machine is communicated with the external machine circuit board of each slave machine;

when the external machine circuit board of the host machine receives the filth blockage detection instruction, the filth blockage detection instruction is sent to the external machine circuit board of each slave machine, and filth blockage detection is carried out on the electrical box of the host machine, so that a filth blockage detection result of the electrical box of the host machine is obtained;

the method comprises the steps that an outer machine circuit board of a host machine sends an electrical box filth blockage detection result of the host machine and an electrical box filth blockage detection result of each slave machine to an inner machine circuit board of each indoor machine;

when an internal machine circuit board of each indoor machine receives a filth blockage detection result of the electrical box, sending a control instruction to the corresponding display device, and controlling the corresponding display device to display the filth blockage detection result;

the outer machine circuit board is provided with a fan control module, a wind speed detection module and a main controller;

the main controller sends a detection instruction to the fan control module and the wind speed detection module when receiving an electrical box filth blockage detection instruction, and judges an electrical box filth blockage detection result according to a received wind speed value sent by the wind speed detection module; sending a control instruction to the display device, and controlling the display device to display a filth blockage detection result;

an air inlet and an air outlet are formed in a box body of the electrical box, and an installation cavity is formed in the box body; the mounting cavity is communicated with the air inlet and the air outlet; the outer machine circuit board is arranged in the mounting cavity;

the wind speed detection module comprises:

the air-gathering shell is provided with an air-gathering inlet facing the air inlet of the electric box and an air-gathering outlet facing the air outlet of the electric box; an air gathering air channel communicated with the air gathering inlet and the air gathering outlet is formed in the air gathering shell;

the wind speed sensor comprises a wind speed sensing chip and a PCB, wherein the wind speed sensing chip is installed on the PCB and is electrically connected with a first interface of the PCB, the first interface of the PCB is electrically connected with a second interface of the PCB, the PCB is installed on the outer machine circuit board, and the second interface of the PCB is electrically connected with the main controller;

2. The air conditioning system of claim 1, wherein: the judging of the electrical box filth blockage detection result according to the detected wind speed value specifically includes:

if the third threshold value is more than or equal to delta V and more than the second threshold value, judging that the electrical box filth blockage detection result is medium filth blockage;

3. The air conditioning system of claim 1, wherein: the display device comprises one or more of a display screen on the wire controller, a display screen on the remote controller and a display screen on the front panel of the indoor unit.

4. The air conditioning system of claim 1, wherein: an amplifying circuit is arranged on the PCB; and the first interface of the PCB is connected with the second interface of the PCB through the amplifying circuit.

5. The air conditioning system of claim 4, wherein: the PCB is also provided with a microcontroller; the input end of the microcontroller is connected with the output end of the amplifying circuit;

the second interface of the PCB board comprises a TXD pin and an RXD pin; the output end of the microcontroller is connected with a TXD pin, and the input end of the microcontroller is connected with an RXD pin;

the TXD pin is connected with the input end of the main controller;

the RXD pin is connected with the output end of the main controller.

6. The air conditioning system of claim 1, wherein: the wind speed detection module further comprises an installation structure, the installation structure comprises an installation groove, and the wind gathering shell and the wind speed sensor are installed in the installation groove;

a wire hole is formed in the wall of the mounting groove, and a cable penetrates through the wire hole to connect the second interface of the PCB with the main controller.

7. The air conditioning system of claim 6, wherein: the mounting structure further comprises a cover plate, and the cover plate is covered on the notch of the mounting groove and detachably connected with the mounting groove.