Fresh air control system and control method thereof

Abstract

The invention discloses a fresh air control system and a control method thereof, and belongs to the technical field of building heating and ventilation. The fresh air control system comprises a power terminal, a main controller and power supply equipment. The power supply equipment supplies power to the power terminal and the main controller. The power terminal comprises at least one group of intelligent power terminals, each intelligent power terminal comprises a control communication unit connected with the main controller, and the control communication units send signals to the main controller and determine operation parameters of the intelligent power terminals according to the state of the main controller. According to the invention, the basic operation requirement of the system can be still maintained under the condition that the main controller fails.

Description

Technical Field

[0001] The invention relates to the technical field of building heating and ventilation, and in particular to a combined control scheme involving a heat pump host, a fresh air unit and an exhaust fan. Background Art

[0002] The fresh air system is an independent air treatment system consisting of an air supply system and an exhaust system. It can circulate indoor air, discharge indoor polluted air to the outside on the one hand, and input outdoor fresh air into the room after filtering, dehumidification / humidification, heating / cooling and other measures on the other hand, so that the room can obtain fresh and clean air with suitable temperature. The fresh air system involves the control of power equipment such as heat pump host, fresh air unit and exhaust fan unit, which specifically includes the start and stop control of the unit and the setting of related parameters. In the existing control scheme, the start and stop of all indoor equipment and the setting of related parameters are completed by a main controller. The operation of the unit is completely dependent on the main controller. Due to the limitation of investment in civil building equipment, the controller cannot be made into redundant backup. Therefore, once the controller fails, the whole system will stop, that is, the heat pump host cannot be started, and the fresh air unit and exhaust fan are all shut down, which brings a bad experience to the end customers.

[0003] Based on this, this application is filed. Summary of the invention

[0004] To this end, the present invention proposes a fresh air control system and a control method thereof which can ensure the operation of the system when a main controller fails.

[0005] In view of the above technical problems, the present invention provides the following technical solutions:

[0006] A fresh air control system includes: a power terminal, a main controller and a power supply device, wherein the power supply device distributes power to the power terminal and the main controller respectively; the power terminal includes at least one group of intelligent power terminals, and the intelligent power terminal includes a control communication unit connected to the main controller, the control communication unit sends a signal to the main controller, and determines the operating parameters of the intelligent power terminal according to the state of the main controller.

[0007] In some embodiments of the present invention, the control communication unit includes a sub-controller and a communication module, the communication module is used to communicate with the main controller, when the main controller is in a normal working state, the intelligent power terminal operates under the control of the main controller; when the main controller is in an abnormal working state, the intelligent power terminal operates under the control of the sub-controller.

[0008] In some embodiments of the present invention, the power supply device includes power supply circuits respectively connected to the power terminals, and the power supply circuits are provided with control switches, and the control switches are suitable for controlling the start and stop of the power terminals.

[0009] In some implementation modes of the present invention, the intelligent power terminal includes a heat pump host and an air blower arranged in a fresh air passage.

[0010] In some embodiments of the present invention, the power supply circuit of the heat pump host includes a first circuit breaker, a first control switch and a first contactor; the first circuit breaker, the first control switch and the contact coil of the first contactor are connected in series, and the auxiliary contact of the first contactor is connected in parallel with the first control switch.

[0011] In some embodiments of the present invention, the power supply circuit of the blower includes a second circuit breaker, a second control switch and a second contactor; the second circuit breaker, the second control switch and the contact coil of the second contactor are connected in series, and the auxiliary contact of the second contactor is connected in parallel with the second control switch.

[0012] In some embodiments of the present invention, the power terminal includes at least one group of non-intelligent power terminals, and the non-intelligent power terminal includes an exhaust fan arranged in the exhaust channel.

[0013] In some embodiments of the present invention, the power supply circuit of the exhaust fan includes a third circuit breaker, a third control switch and a third contactor; the third circuit breaker, the auxiliary contacts of the second contactor, the third control switch and the contact coil of the third contactor are connected in series, and the auxiliary contacts of the third contactor are connected in parallel.

[0014] The present invention also provides a control method for a fresh air control system, comprising:

[0015] The control communication unit of the intelligent power terminal sends a communication signal to the main controller at an interval of a first set time; if a feedback signal from the main controller is received within a second set time, the intelligent power terminal adopts the control signal of the main controller to operate; if no feedback signal from the main controller is received within the second set time, the control signal of the control communication unit is adopted to operate.

[0016] In some implementation modes of the present invention, if no feedback signal from the main controller is received within a second set time, the control communication unit controls to send out an alarm signal.

[0017] The technical solution of the present invention has the following technical effects compared with the prior art:

[0018] In the fresh air control system provided by the present invention, on the one hand, the power supply equipment is used to distribute power to the power terminal and the main controller respectively, which can avoid the problem in the prior art that the power terminal is electrically connected to the power supply equipment through the controller, and when the controller fails, the power terminal cannot work. On the other hand, the intelligent power terminal in the present application is provided with a control communication unit, which can send a signal to the main controller to determine the state of the main controller, and determine the control strategy of the intelligent power terminal according to the state of the main controller, so that when the main controller fails, the operation of the intelligent power terminal can still be guaranteed to maintain the basic operation requirements of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0020] Figure 1 A system configuration diagram of a specific implementation mode of the fresh air system of the present invention;

[0021] Figure 2 A system configuration diagram of a specific implementation mode of the fresh air control system of the present invention;

[0022] Figure 3 A system configuration diagram of another specific implementation of the fresh air control system of the present invention;

[0023] Figure 4 It is a schematic diagram of a power supply circuit in a specific implementation manner of the fresh air control system of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 The figure shows a system diagram of a specific implementation of the fresh air control system provided by the present invention. The fresh air control system is used to control the power terminal in the fresh air system. The fresh air system has an air inlet channel 100 and an air exhaust channel 200 that are independent of each other. Among them, the air inlet channel 100 is used to filter the outdoor air and adjust the temperature and humidity to send suitable fresh air into the room, and the exhaust channel 200 is used to collect the indoor air and discharge it to the outside after filtering and other treatments. The exhaust channel 200 and the air inlet channel 100 are independent of each other, and the air is relatively sealed. The fresh air system includes a plurality of power terminals 500, for example, including a blower 501 arranged in the air inlet channel 100 for supplying air to the room, an exhaust fan 502 arranged in the exhaust channel 200 for exhausting air to the outside, and a heat pump host 503 arranged in the exhaust channel 200. Among them, in the above power terminal 500, the air supply fan 501 and the heat pump host 503 need the intelligent controller to provide control signals according to different working conditions to realize intelligent control, and this type of power terminal is an intelligent power terminal 500a. The exhaust fan 502 only needs start and stop control, and does not need the intelligent controller to preset control parameters. Therefore, this type of power terminal is a non-intelligent power terminal 500b.

[0029] The fresh air control system includes a power terminal 500, a main controller 300 and a power supply device 400, wherein the power supply device 400 distributes power to the power terminal 500 and the main controller 300 respectively; the power terminal 500 includes at least one group of intelligent power terminals 500a, wherein the intelligent power terminal 500a includes a control communication unit 5011 / 5031 connected to the main controller 300, wherein the control communication unit 5011 / 5031 sends a signal to the main controller 300 and determines the operating parameters of the intelligent power terminal 500a according to the state of the main controller 300. On the one hand, the control system distributes power to the power terminal 500 and the main controller 300 respectively through the power supply device 400, thereby avoiding the problem in the prior art that the power terminal 500 is connected to the power supply device 400 through the controller, and the power terminal 500 cannot work when the controller fails. On the other hand, the intelligent power terminal 500a is provided with a control communication unit 5011 / 5031 which can send a signal to the main controller 300 to determine the status of the main controller 300, and determine the control strategy of the intelligent power terminal 500a according to the status of the main controller 300, so that when the main controller 300 fails, the operation of the intelligent power terminal 500a can still be guaranteed to maintain the basic operation requirements of the system.

[0030] Specifically, the control communication unit 5011 / 5031 includes a sub-controller and a communication module, wherein the communication module is used to communicate with the main controller 300, and the sub-controller is used to call a basic control program suitable for maintaining the operation of the intelligent control terminal. When the main controller 300 is judged to be in a normal working state after one or more communications with the main controller 300 according to the communication module, the intelligent power terminal 500a operates under the control of the main controller 300; when the main controller 300 is judged to be in an abnormal working state after one or more communications with the main controller 300 according to the communication module, the intelligent power terminal 500a operates under the control of the sub-controller.

[0031] Specifically, in an optional embodiment, the intelligent power terminal 500a is provided with an intelligent control interface 5012 / 5032 for being electrically connected to the main controller 300, and the control signal of the main controller 300 is transmitted to the intelligent power terminal 500a via a control line passing through the intelligent control interface 5012 / 5032.

[0032] Specifically, in an optional embodiment, the power supply device 400 includes a power supply circuit connected to the power terminal 500 respectively, and a control switch is provided on the power supply circuit, and the control switch is suitable for controlling the start and stop of the power terminal 500; the start and stop of the power terminal 500 does not need to be controlled by the main controller 300 but is directly controlled by the control switch of the power supply device 400, which can avoid the problem of the power terminal 500 failing to work due to a failure of the main controller 300.

[0033] Among them, the power supply circuit of the heat pump host 503 includes a first circuit breaker SS1, a first control switch SF1 and a first contactor QF1; specifically, the first circuit breaker SS1, the first control switch SF1 and the contact coil of the first contactor QF1 are connected in series, and the auxiliary contact of the first contactor QF1 is connected in parallel with the first control switch SF1; the first circuit breaker SS1 is in a normally closed state, and the first control switch SF1 is a button-type control switch, which is in a normally open state; when the first control switch SF1 is closed, the contact coil of the first contactor QF1 is energized, so that the auxiliary contact of the first contactor QF1 is closed, the power supply circuit of the heat pump host 503 is in an on state, and the heat pump host 503 is started.

[0034] The power supply circuit of the air blower 501 includes a second circuit breaker SS2, a second control switch SF2 and a second contactor QF2; the contact coils of the second circuit breaker SS2, the second control switch SF2 and the second contactor QF2 are connected in series, and the auxiliary contacts of the second contactor QF2 are connected in parallel with the second control switch SF2; the second circuit breaker SS2 is in a normally closed state, and the second control switch SF2 is a button-type control switch, which is in a normally open state; when the second control switch SF2 is closed, the contact coil of the second contactor QF2 is energized, so that the auxiliary contacts of the second contactor QF2 are closed, the power supply circuit of the air blower 501 is in an on state, and the air blower 501 is started.

[0035] Since the exhaust fan 502 needs to be started when the blower 501 is started, the power supply circuit of the exhaust fan 502 needs to be controlled in linkage with the power supply circuit of the blower 501. Specifically, in the power supply circuit of the blower 501, the second contactor QF2 is provided with two pairs of auxiliary contacts, one pair of which is provided in the power supply circuit of the blower 501, and the other pair of which is provided in the power supply circuit of the exhaust fan 502. Specifically, the power supply circuit of the exhaust fan 502 includes a third circuit breaker SS3, a third control switch SF3 and a third contactor QF3; the third circuit breaker SS3, the auxiliary contacts of the second contactor QF2, the third control switch SF3 and the contact coil of the third contactor QF3 are connected in series, and the auxiliary contacts of the third contactor QF3 are connected in parallel with the third control switch SF3. The third circuit breaker SS3 is in a normally closed state, and the third control switch SF3 is a button-type control switch, which is in a normally open state; when the power supply circuit of the blower 501 is in an on state, that is, the contact of the second contactor QF2 is in a closed state, after the third control switch SF3 is controlled to be closed, the contact coil of the third contactor QF3 is energized, so that the auxiliary contact of the third contactor QF3 is closed, the power supply circuit of the exhaust fan 502 is in an on state, and the exhaust fan 502 is started.

[0036] The power supply circuit of the power supply device 400 can be used to start and stop each power terminal 500 separately without going through the main controller 300. In particular, for the non-intelligent power terminal 500b such as the exhaust fan 502 that only needs to be started and stopped, it can be completely set independently from the main controller 300. For the intelligent power terminal 500a such as the heat pump host 503 and the blower 501 that need parameter settings for normal operation, it can be controlled by the main controller 300 when the main controller 300 is in normal working state. When the main controller 300 is in abnormal working state, the power supply circuit of the power supply device 400 cooperates with the sub-controller of the intelligent power terminal 500a to realize emergency work.

[0037] The control method using the above-mentioned fresh air control system comprises the following steps:

[0038] S1. The control communication unit 5011 / 5031 of the intelligent power terminal 500a sends a communication signal to the main controller 300 at a first set time interval;

[0039] Specifically, in an optional embodiment, a control communication unit 5011 / 5031 is respectively provided on the air blower 501 and the heat pump host 503. The control communication unit 5011 / 5031 sends a signal to the controller every first set time, for example, the first set time is 1s, 3s, or 5s. If the main controller 300 works normally, a feedback signal will be given to the control communication unit 5011 / 5031. This back and forth is called a successful handshake.

[0040] S2. If a feedback signal from the main controller 300 is received within the second set time, the intelligent power terminal 500a operates using the control signal from the main controller 300; if no feedback signal from the main controller 300 is received within the second set time, the intelligent power terminal 500a operates using the control signal from the control communication unit 5011 / 5031.

[0041] Specifically, in an optional implementation, when the control communication unit 5011 / 5031 receives a feedback signal from the main controller 300 within a second set time, for example, the second set time is 6s, 8s, or 10s, that is, the handshake is successful, indicating that the main controller 300 is in a normal working state. At this time, the control signal of the main controller 300 is sent to the intelligent control interface of the intelligent power terminal 500a through the control line, and the intelligent power terminal 500a operates using the operating parameters sent by the main controller 300; and when the control communication unit 5011 / 5031 does not receive a feedback signal from the main controller 300 within the second set time, for example, the control communication unit 5011 / 5031 sends a communication signal at intervals of 2s, if no feedback is received, it continues to send after 2s, and when no feedback signal is received after sending 5 times, it indicates that the main controller 300 is in an abnormal working state. At this time, the control communication unit 5011 / 5031 sends a control signal to the intelligent power terminal 500a to enable it to operate using the control parameters preset in its sub-controller.

[0042] Specifically, in an optional implementation, if the feedback signal from the main controller 300 is not received within the second set time, the control communication unit 5011 / 5031 controls to send an alarm signal to notify relevant personnel of the failure of the main controller 300. When the device is running in the preset program of the sub-controller, the control communication unit 5011 / 5031 will continue to send signals to the main controller 300 at the first set time interval. If feedback is received within the second set time, a command to stop running the preset program of the sub-controller will be sent to the intelligent power terminal 500a, requiring the intelligent power terminal 500a to continue to be controlled by the main controller 300.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A fresh air control system, characterized in that: include: A power terminal, a main controller and a power supply device, wherein the power supply device distributes power to the power terminal and the main controller respectively; The power terminal includes at least one group of intelligent power terminals, and the intelligent power terminal includes a control communication unit connected to the main controller. The control communication unit sends a signal to the main controller and determines the operating parameters of the intelligent power terminal according to the state of the main controller.

2. A fresh air control system according to claim 1, characterized in that: The control communication unit includes a sub-controller and a communication module, wherein the communication module is used to communicate with the main controller. When the main controller is in a normal working state, the intelligent power terminal operates under the control of the main controller; when the main controller is in an abnormal working state, the intelligent power terminal operates under the control of the sub-controller.

3. A fresh air control system according to claim 1, characterized in that: The power supply equipment includes power supply circuits respectively connected to the power terminals. A control switch is provided on the power supply circuits. The control switch is suitable for controlling the start and stop of the power terminals.

4. A fresh air control system according to claim 3, characterized in that: The intelligent power terminal includes a heat pump host and an air blower arranged in the fresh air channel.

5. A fresh air control system according to claim 4, characterized in that: The power supply circuit of the heat pump host includes a first circuit breaker, a first control switch and a first contactor; the first circuit breaker, the first control switch and the contact coil of the first contactor are connected in series, and the auxiliary contact of the first contactor is connected in parallel with the first control switch.

6. A fresh air control system according to claim 4, characterized in that: The power supply circuit of the blower includes a second circuit breaker, a second control switch and a second contactor; the second circuit breaker, the second control switch and the contact coil of the second contactor are connected in series, and the auxiliary contact of the second contactor is connected in parallel with the second control switch.

7. A fresh air control system according to claim 3, characterized in that: The power terminal includes at least one group of non-intelligent power terminals, and the non-intelligent power terminal includes an exhaust fan arranged in an exhaust channel.

8. A fresh air control system according to claim 7, characterized in that: The power supply circuit of the exhaust fan includes a third circuit breaker, a third control switch and a third contactor; the third circuit breaker, the auxiliary contacts of the second contactor, the third control switch and the contact coil of the third contactor are connected in series, and the auxiliary contacts of the third contactor are connected in parallel with the third control switch.

9. A control method for a fresh air control system according to any one of claims 1 to 8, characterized in that: include: The control communication unit of the intelligent power terminal sends a communication signal to the main controller at a first set time interval; If the feedback signal of the main controller is received within the second set time, the intelligent power terminal uses the control signal of the main controller to operate; if the feedback signal of the main controller is not received within the second set time, the intelligent power terminal uses the control signal of the control communication unit to operate.

10. The control method according to claim 9, characterized in that: If no feedback signal from the main controller is received within the second set time, the control communication unit controls to send out an alarm signal.

Images