A dual-speed fan automatic control device and control method thereof

Abstract

The present application relates to a dual-speed fan automatic control device and a control method thereof, wherein the dual-speed fan automatic control device is composed of a thermal relay 1, a contactor 1, a low-voltage circuit breaker, a contactor 2, a contactor 3, a thermal relay 2, a total stop operation button, a low-speed operation stop AC time relay, a low-speed operation manual stop button, a low-speed operation manual start button, a low-speed operation start AC intermediate relay, a high-speed operation stop AC time relay, a high-speed operation overload alarm AC intermediate relay, a high-speed operation manual stop button, a high-speed operation manual start button, a low-speed operation start DC intermediate relay, a low-speed operation stop DC intermediate relay, a high-speed operation start DC intermediate relay, a high-speed operation stop DC intermediate relay, a high-speed operation start AC intermediate relay, an automatic control switch, a signal light, a buzzer, a switching power supply, a transmitter, and a sensor, and the sensor is connected to the transmitter. The present application is concise, convenient, and reliable.

Description

Technical Field

[0001] The present application relates to a dual-speed fan automatic control device and a control method thereof. Background Art

[0002] The two-speed fan control methods commonly used at present are manual control on the control box or on site and automatic control through the BA system [1] In order to improve the indoor environment of buildings, increase energy efficiency and reduce building energy consumption, more and more two-speed fans in new and renovated buildings need to be automatically controlled by indoor environmental parameters such as CO concentration, CO2 concentration, temperature, humidity, pressure, etc. [2~7] However, the BA system, which requires large investment and high requirements for operation and maintenance personnel, has not been widely used in buildings. At this time, how to achieve automatic control of two-speed fans is one of the research focuses in the field of low-voltage control.

[0003] [1] 16D303-2 Common fan control circuit diagram [S];

[0004] [2] GB 50736-2012, Code for design of heating, ventilation and air conditioning for civil buildings (additional provisions)[S].

[0005] [3] GB / T 50668-2011, Energy-saving building evaluation standard[S].

[0006] [4] JGJ 176-2009, Technical specification for energy-saving renovation of public buildings[S].

[0007] [5] JGJ 16-2008, Civil building electrical design code[S].

[0008] [6] GB 50189-2005, Energy-saving design standard for public buildings[S].

[0009] [7] GB / T 50378-2014, Green building evaluation standard[S]. Summary of the invention

[0010] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide a two-speed fan automatic control device and a control method thereof which are streamlined, flexible, easy to use, safe and reliable, so as to achieve the purpose of automatically controlling the operation of the fan according to the environmental parameters in the building without building a management platform or setting up a BA system.

[0011] The technical solutions adopted by this application to solve the above technical problems include:

[0012] A dual-speed fan automatic control device, characterized by comprising a thermal relay 1, a contactor 1, a low-voltage circuit breaker, a contactor 2, a contactor 3, a thermal relay 2, a total stop operation button, a low-speed operation stop AC time relay, a low-speed operation manual stop button, a low-speed operation manual start button, a low-speed operation start AC intermediate relay, a high-speed operation stop AC time relay, a high-speed operation overload alarm AC intermediate relay, a high-speed operation manual stop button, a high-speed operation manual start button, a low-speed operation start DC intermediate relay, a low-speed operation stop DC intermediate relay, a high-speed operation start The system is composed of a DC intermediate relay for high-speed operation stop, a DC intermediate relay for high-speed operation start, an automatic control switch, a red signal light, a white signal light, a buzzer, a switching power supply, a transmitter, and a sensor. The sensor is connected to the transmitter. The two-speed fan terminal 1 is connected to the low-voltage AC power supply through a thermal relay 1, a contactor 1, and a low-voltage circuit breaker. The two-speed fan terminal 1 is connected to the contactor in a three-star shape. The two-speed fan terminal 2 is connected to the load side of the low-voltage circuit breaker through a thermal relay 2 and a contactor 2. The AC power supply is connected to the total stop button through a fuse.

[0013] The total stop operation button is connected to the normally closed contact of the low-speed stop AC time relay, the normally closed contact of the high-speed stop AC time relay, the normally open contact of the thermal relay 2, the normally open contact of the high-speed overload alarm AC intermediate relay, and one end of the automatic control switch;

[0014] The other end of the normally closed contact of the low-speed operation stop AC time relay is connected to one end of the low-speed operation manual stop button; the other end of the low-speed operation manual stop button is connected to the low-speed operation manual start button, a normally open contact of the contactor, two normally open contacts of the low-speed operation start AC intermediate relay, the normally open contact of the low-speed operation start DC intermediate relay, and one end of the normally open contact of the low-speed operation stop DC intermediate relay;

[0015] The other end of a normally open contact of the low-speed operation manual start button, a normally open contact of the contactor, and a normally open contact of the low-speed operation start AC intermediate relay (among which) is connected to one end of the normally closed contact of the contactor; the other end of the normally closed contact of the contactor is connected to one end of the normally closed contact of the thermal relay; the other end of the normally closed contact of the thermal relay is connected to one end of the coil of the contactor;

[0016] The other end of the other normally open contact of the low-speed running starting AC intermediate relay (among them), the other end of the normally open contact of the low-speed running starting DC intermediate relay, and one end of the coil of the low-speed running starting AC intermediate relay are connected;

[0017] The other end of the normally open contact of the low-speed operation stop DC intermediate relay is connected to one end of the low-speed operation stop AC time relay coil;

[0018] The other end of the normally closed contact of the high-speed operation stop AC time relay is connected to one end of the high-speed operation manual stop button;

[0019] The other end of the high-speed operation manual stop button is connected to the high-speed operation manual start button, the second normally open contact of the contactor, the two normally open contacts of the high-speed operation start AC intermediate relay, the normally open contact of the high-speed operation start DC intermediate relay, and one end of the normally open contact of the high-speed operation stop DC intermediate relay;

[0020] The high-speed operation manual start button, the normally open contact of the contactor 2, and the other end of one normally open contact of the high-speed operation start AC intermediate relay (among which) are connected to one end of the normally closed contact of the contactor 1; the other end of the normally closed contact of the contactor 1 is connected to one end of the contactor 3 coil and the contactor 2 coil;

[0021] Another normally open contact of the high-speed operation starting AC intermediate relay (among them) and the other end of the normally open contact of the high-speed operation starting DC intermediate relay are connected to one end of the high-speed operation starting AC intermediate relay coil;

[0022] The other end of the normally open contact of the high-speed operation stop DC intermediate relay is connected to one end of the high-speed operation stop AC time relay coil;

[0023] The other end of the normally open contact of the thermal relay is connected to one end of the high-speed operation overload alarm AC intermediate relay coil;

[0024] The other end of the normally open contact of the high-speed running overload alarm AC intermediate relay is connected to one end of the red signal light and buzzer;

[0025] The other end of the automatic control switch is connected to one end of the switch power input side;

[0026] The other end of the switch power input side is connected to one end of the white signal light;

[0027] The other end of the contactor coil 1, the low-speed running starting AC intermediate relay coil, the low-speed running stopping AC time relay coil, the contactor coil 3, the contactor coil 2, the high-speed running starting AC intermediate relay coil, the high-speed running stopping AC time relay coil, the high-speed running overload alarm AC intermediate relay coil, the red signal light, the buzzer, and the white signal light are connected to the neutral line of the AC power supply;

[0028] One end of the switching power supply output is connected to one end of the normally open contact of the transmitter; the other end of the switching power supply output is connected to one end of the low-speed operation start DC intermediate relay coil, the low-speed operation stop DC intermediate relay coil, the high-speed operation start DC intermediate relay coil, and the high-speed operation stop DC intermediate relay coil; the other end of the transmitter normally open contact is respectively connected to the other ends of the low-speed operation start DC intermediate relay coil, the low-speed operation stop DC intermediate relay coil, the high-speed operation start DC intermediate relay coil, and the high-speed operation stop DC intermediate relay coil.

[0029] The transmitter provides no less than four normally open contacts.

[0030] The present application is installed on a device box, which is composed of a box body, a box door, and a box top. Holes for external wiring are reserved on the box body. The primary component layout area and the secondary component layout area are separately arranged inside the box body. A stop button, a low-speed manual stop button, a high-speed manual stop button, a low-speed manual start button, a high-speed manual start button, a red signal light, a buzzer, an automatic control switch, and a white signal light are embedded on the box door.

[0031] The primary component layout area and the secondary component layout area of ​​the present application are separated by a metal partition, and all secondary component relays (including low-speed operation start DC intermediate relay, low-speed operation stop DC intermediate relay, high-speed operation start DC intermediate relay, high-speed operation stop DC intermediate relay, high-speed operation overload alarm AC intermediate relay, low-speed operation start AC intermediate relay, high-speed operation start AC intermediate relay, low-speed operation stop AC time relay, high-speed operation stop AC time relay) are centrally arranged in the secondary component layout area close to the primary component layout area. Each secondary component relay is installed with a clip, the transmitter is installed at the bottom of the relay area, and the terminal blocks are centrally arranged in the secondary component layout area close to the primary component layout area.

[0032] The metal partition is provided with hole one and hole two to facilitate on-site construction and installation.

[0033] The technical solutions adopted by this application to solve the above technical problems also include:

[0034] The control method of the above-mentioned dual-speed fan automatic control device is characterized by comprising the following steps:

[0035] S1: Power on and start;

[0036] S2: Sensor detects indoor environmental parameters;

[0037] S3: The sensor converts the indoor environmental parameters into electrical signals and transmits them to the transmitter:

[0038] S4: The transmitter compares the indoor environmental parameters with the maximum and minimum thresholds of the set action parameters; when the indoor environmental parameters are greater than the maximum threshold of the set action parameters,

[0039] A normally open contact of the transmitter connected to the high-speed operation start DC intermediate relay coil is closed, and the high-speed operation start DC intermediate relay coil is energized;

[0040] The normally open contact of the high-speed running start DC intermediate relay is closed, and the high-speed running start AC intermediate relay coil is energized;

[0041] The two normally open contacts of the AC intermediate relay are closed when high-speed operation is started, and the contactor coil 3 and contactor coil 2 are energized;

[0042] The normally open contact of contactor 2 is closed, and the fan enters high-speed operation state.

[0043] When the indoor environment parameters are between the maximum threshold and the minimum threshold of the set action parameters,

[0044] A normally open contact of the transmitter connected to the low-speed operation start DC intermediate relay coil is closed, and the low-speed operation start DC intermediate relay coil is energized;

[0045] The normally open contact of the DC intermediate relay for starting low-speed operation is closed, and the coil of the AC intermediate relay for starting low-speed operation is energized;

[0046] The two normally open contacts of the AC intermediate relay are closed when starting low-speed operation, and one coil of the contactor is energized;

[0047] Once the normally open contact of the contactor is closed, the fan enters the low-speed operation state.

[0048] When the indoor environmental parameters are less than the minimum threshold of the set action parameters,

[0049] The two normally open contacts of the transmitter connected to the low-speed stop DC intermediate relay coil and the high-speed stop DC intermediate relay coil are both closed, and the low-speed stop DC intermediate relay coil and the high-speed stop DC intermediate relay coil are energized;

[0050] The normally open contact of the DC intermediate relay for stopping low-speed operation is closed, the normally open contact of the DC intermediate relay for stopping high-speed operation is closed, and the AC time relay coil for stopping low-speed operation and the AC time relay coil for stopping high-speed operation are energized;

[0051] When the AC time relay stops running at low speed, the normally closed contact opens according to the set delay time; when the AC time relay stops running at high speed, the normally closed contact opens according to the set delay time, and the fan enters the stop state.

[0052] S5: The duration of the above three states (low-speed operation, high-speed operation, and shutdown). If there is a button request, enter the button processing, otherwise go to step S2 after the collection cycle delay.

[0053] When the total stop button is pressed, all AC relay coils lose power and the fan enters the stop state.

[0054] Disconnect the automatic control switch, the switch power supply loses power, and the automatic control is released. At this time, it is convenient for the operator to perform local maintenance operations. At this time, automatic control cannot be performed and will not endanger the safety of the operator. After the operation is completed, the operator can choose to perform manual low-speed operation, manual high-speed operation, stop operation or close the automatic control switch by pressing the button. After closing the automatic control switch, the automatic control is restored and go to step S2.

[0055] Before manually starting low-speed operation or high-speed operation, you need to disconnect the automatic control switch.

[0056] When the low-speed manual start button is pressed, the first coil of the contactor is energized, the first normally open contact of the contactor is closed, and the fan enters the low-speed operation state; when the fan is in the low-speed operation state, the low-speed manual stop button is pressed, the first coil of the contactor is de-energized, the fan stops running at low speed, and after the collection cycle delay, the process goes to step S2.

[0057] When the high-speed manual start button is pressed, contactor coil 2 and contactor coil 3 are energized, contactor coil 2 is closed, and the fan enters high-speed operation state; when the high-speed manual stop button is pressed while the fan is running at high speed, contactor coil 2 and contactor coil 3 are de-energized, the fan stops running at high speed, and after a delay in the acquisition cycle, the process goes to step S2.

[0058] In the initial state of this application, the fan is in a stopped operating (referred to as shutdown) state, and the sensor collects indoor environmental parameters and transmits them to the transmitter; the transmitter compares the indoor environmental parameters with the set action parameter maximum threshold (Max) and minimum threshold (Min); when the indoor environmental parameter is greater than the set action parameter maximum threshold, the transmitter controls (refers to the transmitter controlling through the above four DC intermediate relays, the same below) the fan to enter a high-speed operating state; when the indoor environmental parameter is between the set action parameter maximum threshold and the minimum threshold, the transmitter controls the fan to enter a low-speed operating state; when the indoor environmental parameter is less than the set action parameter minimum threshold, the transmitter controls the fan to enter a delayed shutdown state.

[0059] The sensor acquisition cycle of this application is longer than the delayed shutdown time of the fan to avoid system malfunction and facilitate system control.

[0060] When the fan of this application is overloaded, if the indoor environmental parameters are between the maximum threshold and the minimum threshold of the set action parameters, the normally closed contact of the thermal relay 1 will be disconnected and the fan will be stopped; if the indoor environmental parameters are greater than the maximum threshold of the set action parameters, the normally open contact of the thermal relay 2 will be closed, and the red signal light and buzzer will be activated through the high-speed overload alarm AC intermediate relay.

[0061] If the fan is running at low speed and the fan is shut down due to overload, it needs to be repaired or switched to high-speed operation; if the fan is running at high speed and the fan is overloaded, the fan will only start the sound and light alarm to remind the operation and maintenance personnel to repair the fan but will not stop the fan, so as to avoid the continuous operation of the system being affected by the overload shutdown. The technical solution of shutting down the fan due to overload at low speed and only alarming but not shutting down the fan due to overload at high speed improves the reliability of system operation.

[0062] This application uses sensors, transmitters, relays, etc. to build a streamlined system to replace the BA system, thereby reducing investment and alleviating the pressure of debugging and operation and maintenance; improves the controllability of the system by setting the relationship between the sensor acquisition cycle and the delayed shutdown time of the fan; improves safety and reliability by using DC safety extra-low voltage; improves the safety of maintenance personnel by setting an automatic control switch in the control box; sets a total stop operation button in the control box, and does not need to determine whether the fan is running at high speed or low speed. The fan can be stopped in an emergency with one click without opening the control box door, thereby improving ease of use; improves the reliability of the system operation by using the technical solution of shutting down when running at low speed due to overload and only alarming without shutting down when running at high speed due to overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a primary wiring diagram of the dual-speed fan automatic control device of the embodiment of the present application;

[0064] Figure 2 This is the secondary wiring diagram of the dual-speed fan automatic control device of the embodiment of the present application;

[0065] Figure 3 This is the wiring diagram of the transmitter of the dual-speed fan automatic control device of the embodiment of the present application;

[0066] Figure 4 This is the operation control logic diagram of the dual-speed fan automatic control device according to the embodiment of the present application;

[0067] Figure 5 This is a flow chart of fan overload processing of a dual-speed fan automatic control device according to an embodiment of the present application;

[0068] Figure 6 It is a three-dimensional schematic diagram of a dual-speed fan automatic control device according to an embodiment of the present application;

[0069] Figure 7 is a front view of a dual-speed fan automatic control device according to an embodiment of the present application;

[0070] Figure 8is a cross-sectional view of a dual-speed fan automatic control device according to an embodiment of the present application;

[0071] Fig. 9 2. It is a bottom view of the automatic control device for a dual-speed fan according to an embodiment of the present application;

[0072] Fig.10 It is a side view of the dual-speed fan automatic control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0073] The present application will be further described in detail below in conjunction with the accompanying drawings and through examples. The following examples are intended to explain the present application but the present application is not limited to the following examples.

[0074] See also Figures 1 to 10 , this embodiment is composed of a primary element, a secondary element, a transmitter 18 and a sensor installed in a box.

[0075] Sensors include, but are not limited to, CO sensors, CO2 sensors, temperature sensors, humidity sensors, and pressure sensors.

[0076] The number and capacity of contacts provided by the transmitter match the secondary circuit.

[0077] like Figure 1 As shown, the terminal 1 (1U, 1V, 1W) of the two-speed fan M is connected to the low-voltage AC power supply L1, L2, and L3 through the thermal relay 1 BB1, the contactor 1 QA1, and the low-voltage circuit breaker MCCB. At the same time, the terminal 1 is connected in star shape through the contactor 3 QA3, and the terminal 2 (2U, 2V, 2W) is connected to the load side of the low-voltage circuit breaker MCCB through the thermal relay 2 BB2 and the contactor 2 QA2. The casing of the two-speed fan M is connected to the building foundation steel bar through the local equipotential terminal box LEB, and the low-voltage AC power supply PE line is also connected to the LEB. Among them, the low-voltage circuit breaker MCCB is only equipped with an instantaneous release; the thermal relay and contactor contacts meet the secondary wiring requirements.

[0078] like Figure 2 As shown, one end of the fuse FA is connected to any phase line L of the AC power supply, and the other end of the fuse FA is connected to one end of the total stop operation button SC3; the improvements of the present application mainly include: the other end of the total stop operation button SC3 is connected to the normally closed contact of the low-speed stop AC time relay KT1, the normally closed contact of the high-speed stop AC time relay KT2, the normally open contact of the thermal relay 2 BB2, the normally open contact of the high-speed overload alarm AC intermediate relay KZ3, and one end of the automatic control switch SC4;

[0079] The other end of the normally closed contact of the low-speed operation stop AC time relay KT1 is connected to one end of the low-speed operation manual stop button SC1;

[0080] The other end of the low-speed operation manual stop button SC1 is connected to the low-speed operation manual start button SO1, the normally open contact of the contactor QA1, the two normally open contacts of the low-speed operation start AC intermediate relay KZ1, the normally open contact of the low-speed operation start DC intermediate relay KDO, and one end of the normally open contact of the low-speed operation stop DC intermediate relay KDC;

[0081] The manual start button SO1 for low speed operation, the normally open contact of contactor QA1, the other end of a normally open contact of the AC intermediate relay KZ1 for low speed operation start are connected to one end of the normally closed contact of contactor QA3;

[0082] The other end of the normally closed contact of contactor 3 QA3 is connected to one end of the normally closed contact of thermal relay 1 BB1;

[0083] The other end of the normally closed contact of thermal relay BB1 is connected to one end of the coil of contactor QA1;

[0084] The other end of the other normally open contact of the low-speed running starting AC intermediate relay KZ1 and the other end of the normally open contact of the low-speed running starting DC intermediate relay KDO are connected to one end of the coil of the low-speed running starting AC intermediate relay KZ1;

[0085] The other end of the normally open contact of the low-speed operation stop DC intermediate relay KDC is connected to one end of the coil of the low-speed operation stop AC time relay KT1;

[0086] The other end of the normally closed contact of the high-speed operation stop AC time relay KT2 is connected to one end of the high-speed operation manual stop button SC2;

[0087] The other end of the high-speed operation manual stop button SC2 is connected to the high-speed operation manual start button SO2, the normally open contact of the contactor 2 QA2, the two normally open contacts of the high-speed operation start AC intermediate relay KZ2, the normally open contact of the high-speed operation start DC intermediate relay KGO, and one end of the normally open contact of the high-speed operation stop DC intermediate relay KGC;

[0088] The high-speed operation manual start button SO2, the normally open contact of contactor 2 QA2, and the other end of a normally open contact of the high-speed operation start AC intermediate relay KZ2 are connected to one end of the normally closed contact of contactor 1 QA1;

[0089] The other end of the normally closed contact of contactor 1 QA1 is connected to the coil of contactor 3 QA3 and one end of the coil of contactor 2 QA2;

[0090] Another normally open contact of the high-speed operation starting AC intermediate relay KZ2 and the other end of the normally open contact of the high-speed operation starting DC intermediate relay KGO are connected to one end of the coil of the high-speed operation starting AC intermediate relay KZ2;

[0091] The other end of the normally open contact of the high-speed operation stop DC intermediate relay KGC is connected to one end of the high-speed operation stop AC time relay KT2 coil;

[0092] The other end of the normally open contact of thermal relay 2 BB2 is connected to one end of the coil of high-speed operation overload alarm AC intermediate relay KZ3;

[0093] The other end of the normally open contact of the high-speed running overload alarm AC intermediate relay KZ3 is connected to one end of the red signal light DR and the buzzer PB;

[0094] The other end of the automatic control switch SC4 is connected to one end of the input side of the switching power supply KG;

[0095] The other end of the input side of the switching power supply KG is connected to one end of the white signal light DW;

[0096] The other end of contactor one QA1 coil, low-speed operation starting AC intermediate relay KZ1 coil, low-speed operation stopping AC time relay KT1 coil, contactor three QA3 coil, contactor two QA2 coil, high-speed operation starting AC intermediate relay KZ2 coil, high-speed operation stopping AC time relay KT2 coil, high-speed operation overload alarm AC intermediate relay KZ3 coil, red signal light DR, buzzer PB, and white signal light DW are connected to the neutral line N of the AC power supply.

[0097] The above connections can be made by direct connection of components or by connection through terminal blocks.

[0098] The DC voltage at the output end of the switching power supply KG is no more than 50V, the output voltage adjustment range is ±10%, and the output current range is 0~5A.

[0099] This application uses sensors, transmitters, relays, etc. to build a streamlined system to replace the common BA system control solution. There is no need to build a management background. While achieving the same control goals, it reduces the complexity of the system, saves investment, and reduces the pressure of debugging and operation and maintenance.

[0100] When on-site maintenance personnel need to stop the fan urgently, they only need to press the total stop button SC3 to stop the fan with one click. There is no need to determine whether the fan is in high-speed or low-speed operation, nor to open the device box door.

[0101] When on-site maintenance personnel need to perform maintenance on the fan or control device, they only need to disconnect the automatic control switch SC4 to release the automatic control with one click. At the same time, the white signal light DW goes out, indicating that the automatic control function is turned off. This design can avoid the danger to the maintenance operator caused by the automatic operation of the fan during maintenance, thereby improving the safety of the device.

[0102] The present application is composed of a primary element, a secondary element, a transmitter 18 and a sensor installed in a housing 1 .

[0103] The number and capacity of contacts provided by the transmitter 18 match the secondary circuit.

[0104] like Figure 3 As shown, one end of the output terminal DC of the switching power supply KG is connected to one end of the normally open contacts KO1, KO2, KC1, and KC2 of the transmitter;

[0105] The other end of the output terminal DC of the switching power supply KG is connected to one end of the coil of the low-speed operation starting DC intermediate relay KDO, the coil of the low-speed operation stopping DC intermediate relay KDC, the coil of the high-speed operation starting DC intermediate relay KGO, and the coil of the high-speed operation stopping DC intermediate relay KGC;

[0106] The other ends of the normally open contacts KO1, KO2, KC1, and KC2 of the transmitter are respectively connected to the other ends of the low-speed operation start DC intermediate relay KDO coil, the low-speed operation stop DC intermediate relay KDC coil, the high-speed operation start DC intermediate relay KGO coil, and the high-speed operation stop DC intermediate relay KGC coil.

[0107] The DC safety extra-low voltage at the output terminal DC of the switching power supply KG can improve the safety and reliability of the present application.

[0108] like Figure 4 As shown, in the initial state, the fan is in a stopped state, the sensor collects the indoor environmental parameter ρ, the collection period is T, and the indoor environmental parameter ρ is transmitted to the transmitter; the transmitter compares the indoor environmental parameter ρ with the set action parameter thresholds Max and Min; when ρ>Max, the transmitter closes the normally open contact KO2, and the fan enters a high-speed operation state; when Max>ρ>Min, the transmitter closes the normally open contact KO1, and the fan enters a low-speed operation state; when Min>ρ, the transmitter closes the normally open contacts KC1 and KC2, and the fan enters a stopped state;

[0109] The low-speed operation stop delay setting time (low-speed operation delay shutdown time) is T1, and the high-speed operation stop delay setting time (high-speed operation delay shutdown time) is T2; set the sensor acquisition cycle T, T>T1 and T>T2, so that the sensor acquisition cycle T is greater than the fan delay shutdown time to avoid system malfunction and facilitate system control.

[0110] like Figure 5 As shown in the figure, when the fan is overloaded, when the fan is running at a low speed (the indoor environmental parameter ρ satisfies Max>ρ>Min), Figure 2 The normally closed contact of the medium thermal relay BB1 is disconnected, and the fan stops running; when the fan is running at high speed (referring to the indoor environmental parameter ρ satisfying ρ>Max), Figure 2 The normally open contact of the intermediate thermal relay BB2 is closed, and the red signal light DR and buzzer PB are started through the high-speed operation overload alarm AC intermediate relay KZ3.

[0111] If the fan is running at low speed and the fan is shut down due to overload, it needs to be repaired or switched to high-speed operation; if the fan is running at high speed and the fan is overloaded, the fan will only start the sound and light alarm to remind the operation and maintenance personnel to repair the fan but will not stop the fan, so as to avoid the continuous operation of the system being affected by the overload shutdown. The technical solution of shutting down the fan due to overload at low speed and only alarming but not shutting down the fan due to overload at high speed improves the reliability of system operation.

[0112] like Figure 6 and 7 As shown, the embodiment of the present application is composed of a box body 1, a box door 2, a box top 3, and components installed on the box door 2 and inside the box body 1, and the device is connected to the external wiring through the following Fig. 9 The hole 24 reserved at the bottom of the box 1 is shown as connected. The heat dissipation hole 4 is arranged at the top of the box 1. The signboards (including 51 and 52) are hung on the upper part of the box door 2, and the signboard 51 is marked with "primary component layout area", and the signboard 52 is marked with "secondary component layout area".

[0113] The stop button SC3, the low-speed manual stop button SC1, the high-speed manual stop button SC2, the low-speed manual start button SO1, the high-speed manual start button SO2, the red signal light DR, the buzzer PB, the automatic control switch SC4, and the white signal light DW are embedded on the box door 2.

[0114] The function indicator plate 11 is fixed on the box door 2 with rivets, and the corresponding component functions can be indicated in simplified Chinese.

[0115] like Fig. 9 As shown, the mounting holes 25 are used to fix the device to the foundation.

[0116] like Figure 8 As shown, the interior of the box 1 is divided into two layout areas, one is the primary component layout area ( Figure 8 on the right), and the other is the secondary component layout area ( Figure 8On the left side), the two layout areas are separated by a metal partition 20. The relay area 15 centrally arranges all secondary element relays 17 (including low-speed operation start DC intermediate relay KDO, low-speed operation stop DC intermediate relay KDC, high-speed operation start DC intermediate relay KGO, high-speed operation stop DC intermediate relay KGC, high-speed operation overload alarm AC intermediate relay KZ3, low-speed operation start AC intermediate relay KZ1, high-speed operation start AC intermediate relay KZ2, low-speed operation stop AC time relay KT1, high-speed operation stop AC time relay KT2), ​​and the secondary element relay 17 is installed through the buckle 16. The transmitter 18 is installed at the transmitter installation position BS at the bottom of the relay area 15, which is convenient for the external sensor to connect to the transmitter 18. The terminal block 19 is centrally arranged in the secondary element layout area close to the primary element layout area, which is convenient for the cable connection between the primary element and the secondary element. Two 40*4 copper bars 23 are used as the neutral line terminal block N and the protective terminal block PE respectively.

[0117] The metal partition 20 is provided with a hole 1 21 and a hole 22 to facilitate on-site construction and installation. The hole 1 21 is used for connection between the primary element and the secondary element, and the hole 22 is used for passing the neutral line terminal block N.

[0118] Any simple deformation or combination of the technical features and technical solutions of this application should be considered to fall within the protection scope of this application.

Claims

1. A dual-speed fan automatic control device, a dual-speed fan automatic control device, characterized in that It consists of thermal relay 1, contactor 1, low-voltage circuit breaker, contactor 2, contactor 3, thermal relay 2, total stop button, low-speed stop AC time relay, low-speed manual stop button, low-speed manual start button, low-speed start AC intermediate relay, high-speed stop AC time relay, high-speed overload alarm AC intermediate relay, high-speed manual stop button, high-speed manual start button, low-speed start DC intermediate relay, low-speed stop DC intermediate relay, high-speed start DC intermediate relay, high-speed stop DC intermediate relay, high-speed start AC intermediate relay, automatic control switch, red signal light, white signal light, buzzer, switching power supply, transmitter, and sensor. The sensor is connected to the transmitter. The terminal 1 of the two-speed fan is connected to the low-voltage AC power supply through the thermal relay 1, contactor 1, and low-voltage circuit breaker respectively. The terminal 1 of the two-speed fan is connected to the contactor in a three-star shape. The terminal 2 of the two-speed fan is connected to the load side of the low-voltage circuit breaker through the thermal relay 2 and contactor 2. The AC power supply is connected to the total stop button through a fuse. The total stop operation button is connected to the normally closed contact of the low-speed stop AC time relay, the normally closed contact of the high-speed stop AC time relay, the normally open contact of the thermal relay 2, the normally open contact of the high-speed overload alarm AC intermediate relay, and one end of the automatic control switch; The other end of the normally closed contact of the low-speed operation stop AC time relay is connected to one end of the low-speed operation manual stop button; the other end of the low-speed operation manual stop button is connected to the low-speed operation manual start button, a normally open contact of the contactor, two normally open contacts of the low-speed operation start AC intermediate relay, the normally open contact of the low-speed operation start DC intermediate relay, and one end of the normally open contact of the low-speed operation stop DC intermediate relay; The other end of the low-speed manual start button, the normally open contact of the contactor, and one of the normally open contacts of the low-speed start AC intermediate relay are connected to one end of the normally closed contact of the contactor; the other end of the normally closed contact of the contactor is connected to one end of the normally closed contact of the thermal relay; the other end of the normally closed contact of the thermal relay is connected to one end of the coil of the contactor; The other end of the other normally open contact of the low-speed running starting AC intermediate relay and the other end of the normally open contact of the low-speed running starting DC intermediate relay are connected to one end of the coil of the low-speed running starting AC intermediate relay; The other end of the normally open contact of the low-speed operation stop DC intermediate relay is connected to one end of the low-speed operation stop AC time relay coil; The other end of the normally closed contact of the high-speed operation stop AC time relay is connected to one end of the high-speed operation manual stop button; The other end of the high-speed operation manual stop button is connected to the high-speed operation manual start button, the second normally open contact of the contactor, the two normally open contacts of the high-speed operation start AC intermediate relay, the normally open contact of the high-speed operation start DC intermediate relay, and one end of the normally open contact of the high-speed operation stop DC intermediate relay; The other end of the high-speed operation manual start button, the normally open contact of the contactor 2, and one of the normally open contacts of the high-speed operation start AC intermediate relay are connected to one end of the normally closed contact of the contactor 1; the other end of the normally closed contact of the contactor 1 is connected to one end of the contactor 3 coil and the contactor 2 coil; Another normally open contact of the high-speed operation starting AC intermediate relay and the other end of the normally open contact of the high-speed operation starting DC intermediate relay are connected to one end of the high-speed operation starting AC intermediate relay coil; The other end of the normally open contact of the high-speed operation stop DC intermediate relay is connected to one end of the high-speed operation stop AC time relay coil; The other end of the normally open contact of the thermal relay is connected to one end of the high-speed operation overload alarm AC intermediate relay coil; The other end of the normally open contact of the high-speed running overload alarm AC intermediate relay is connected to one end of the red signal light and buzzer; The other end of the automatic control switch is connected to one end of the switch power input side; The other end of the switch power input side is connected to one end of the white signal light; The other end of the contactor coil 1, the low-speed running starting AC intermediate relay coil, the low-speed running stopping AC time relay coil, the contactor coil 3, the contactor coil 2, the high-speed running starting AC intermediate relay coil, the high-speed running stopping AC time relay coil, the high-speed running overload alarm AC intermediate relay coil, the red signal light, the buzzer, and the white signal light are connected to the neutral line of the AC power supply; One end of the switching power supply output end is connected to one end of the four normally open contacts of the transmitter; the other end of the switching power supply output end is connected to one end of the low-speed operation start DC intermediate relay coil, the low-speed operation stop DC intermediate relay coil, the high-speed operation start DC intermediate relay coil, and the high-speed operation stop DC intermediate relay coil; the other ends of the four normally open contacts of the transmitter are respectively connected to the other ends of the low-speed operation start DC intermediate relay coil, the low-speed operation stop DC intermediate relay coil, the high-speed operation start DC intermediate relay coil, and the high-speed operation stop DC intermediate relay coil.

2. The dual-speed fan automatic control device according to claim 1 is characterized in that: The dual-speed fan automatic control device is installed on the device box, which is composed of a box body, a box door, and a box top. Holes for external wiring are reserved on the box body. The primary component layout area and the secondary component layout area are separately arranged inside the box body. A stop button, a low-speed manual stop button, a high-speed manual stop button, a low-speed manual start button, a high-speed manual start button, a red signal light, a buzzer, an automatic control switch, and a white signal light are embedded on the box door.

3. The dual-speed fan automatic control device according to claim 2 is characterized in that: The primary component arrangement area and the secondary component arrangement area are separated by a metal partition, all secondary component relays are centrally arranged in the relay area, each secondary component relay is installed by a snap, the transmitter is installed at the bottom of the relay area, and the terminal row is centrally arranged in the secondary component arrangement area close to the primary component arrangement area.

4. The dual-speed fan automatic control device according to claim 3 is characterized in that: The metal partition is provided with hole one and hole two.

5. The control method of the dual-speed fan automatic control device according to any one of claims 1 to 4 is characterized by comprising the following steps: S1: Automatic control switch is closed and powered on; S2: Sensor detects indoor environmental parameters; S3: The sensor converts the indoor environmental parameters into electrical signals and transmits them to the transmitter: S4: The transmitter compares the indoor environmental parameters with the maximum and minimum thresholds of the set action parameters; when the indoor environmental parameters are greater than the maximum threshold of the set action parameters, A normally open contact of the transmitter connected to the high-speed operation start DC intermediate relay coil is closed, and the high-speed operation start DC intermediate relay coil is energized; The normally open contact of the high-speed running start DC intermediate relay is closed, and the high-speed running start AC intermediate relay coil is energized; The two normally open contacts of the AC intermediate relay are closed when high-speed operation is started, and the contactor coil 3 and contactor coil 2 are energized; The normally open contact of contactor 2 is closed, and the fan enters high-speed operation state; When the indoor environment parameters are between the maximum threshold and the minimum threshold of the set action parameters, A normally open contact of the transmitter connected to the low-speed operation start DC intermediate relay coil is closed, and the low-speed operation start DC intermediate relay coil is energized; The normally open contact of the DC intermediate relay for starting low-speed operation is closed, and the coil of the AC intermediate relay for starting low-speed operation is energized; The two normally open contacts of the AC intermediate relay are closed when starting low-speed operation, and one coil of the contactor is energized; When the normally open contact of the contactor is closed, the fan enters the low-speed operation state; When the indoor environmental parameters are less than the minimum threshold of the set action parameters, The two normally open contacts of the transmitter connected to the low-speed stop DC intermediate relay coil and the high-speed stop DC intermediate relay coil are both closed, and the low-speed stop DC intermediate relay coil and the high-speed stop DC intermediate relay coil are energized; The normally open contact of the DC intermediate relay for stopping low-speed operation is closed, the normally open contact of the DC intermediate relay for stopping high-speed operation is closed, and the AC time relay coil for stopping low-speed operation and the AC time relay coil for stopping high-speed operation are energized; When the AC time relay stops running at low speed, the normally closed contact is disconnected according to the set delay time; when the AC time relay stops running at high speed, the normally closed contact is disconnected according to the set delay time, and the fan enters the shutdown state; S5: The duration of the above three states. If there is a button request, enter the button processing, otherwise go to step S2 after the collection cycle delay.

6. The control method of the dual-speed fan automatic control device according to claim 5 is characterized by: Disconnect the automatic control switch, the switch power supply loses power, and the automatic control is released; close the automatic control switch, the automatic control is restored, and go to step S2.

7. The control method of the dual-speed fan automatic control device according to claim 5 is characterized by: When the low-speed manual start button is pressed, the first coil of the contactor is energized, the first normally open contact of the contactor is closed, and the fan enters the low-speed operation state; when the fan is in the low-speed operation state, the low-speed manual stop button is pressed, the first coil of the contactor is de-energized, the fan stops running at low speed, and after the collection cycle delay, the process goes to step S2.

8. The control method of the dual-speed fan automatic control device according to claim 5 is characterized by: When the high-speed manual start button is pressed, contactor coil 2 and contactor coil 3 are energized, contactor coil 2 is closed, and the fan enters high-speed operation state; when the high-speed manual stop button is pressed while the fan is running at high speed, contactor coil 2 and contactor coil 3 are de-energized, the fan stops running at high speed, and after a delay in the acquisition cycle, the process goes to step S2.

9. The control method of the dual-speed fan automatic control device according to claim 5 is characterized by: When the total stop button is pressed, the fan enters the stop state.

10. The control method of the dual-speed fan automatic control device according to claim 5, characterized in that: The sensor acquisition cycle is greater than the delayed shutdown time of the fan.

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