Power distribution equipment of self-control axial flow fan

Abstract

The utility model discloses power distribution equipment of an automatic control axial flow fan, and relates to the technical field of fan equipment, and the power distribution equipment of the automatic control axial flow fan comprises an axial flow fan centralized control cabinet and at least two axial flow fans; the axial flow fan centralized control cabinet comprises a main loop and a control loop, the main loop comprises a three-phase alternating current power supply, a circuit breaker, a contactor and at least two axial flow fans, and each axial flow fan is correspondingly provided with a thermal relay; the control loop comprises an emergency stop button, a fuse, a first change-over switch, a second change-over switch, a time relay, a gas probe, a temperature measurement probe, a forced start button and an alarm device; and an auxiliary contact of the contactor is connected with a normally open contact of the time relay in series and then is connected to a three-phase alternating current power supply through the fuse. All branch axial flow fans are controlled in a centralized mode, automatic control over the temperature, combustible gas and poisonous and harmful gas is achieved, the service life of the axial flow fans is prolonged, the maintenance frequency of the fans is reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of fan equipment, and particularly to a power distribution device for an automatic control axial flow fan. Background Art

[0002] At present, there may be high temperature, flammable, explosive, toxic and harmful gases in many places, such as the pump rooms, substations of gas filling stations, workshops of chemical plants, etc. Axial flow fans running 24 hours are usually used in these places for heat dissipation and air replacement. However, the axial flow fans used in these places run for 24 hours, which is not conducive to energy conservation, and the equipment aging and wear are accelerated, increasing the maintenance cost; at the same time, manual operation is required, automatic control cannot be achieved, the fan cannot be started and stopped according to actual needs, and over-temperature alarm, flammable, explosive, and toxic and harmful gas concentration exceeding alarm cannot be achieved. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application proposes a power distribution device for an automatic control axial flow fan, which centrally controls the axial flow fans on each branch, can realize the automatic control of temperature, combustible gas and toxic and harmful gas, and at the same time extends the service life of the axial flow fan, reduces the maintenance frequency of the axial flow fan, reduces the maintenance cost, and reduces the maintenance labor intensity.

[0004] This application provides a power distribution device for an automatic control axial flow fan, including: an axial flow fan centralized control cabinet and at least two axial flow fans;

[0005] The axial flow fan centralized control cabinet includes a main circuit and a control circuit. The main circuit includes a three-phase AC power supply, a circuit breaker, a contactor and at least two axial flow fans. Each axial flow fan is respectively provided with a thermal relay. Each axial flow fan is connected in series with the corresponding thermal relay. The thermal relays are connected in parallel with each other. The main contacts of each thermal relay are connected in series with the main contacts of the contactor, the circuit breaker and the three-phase AC power supply in sequence;

[0006] The control circuit includes an emergency stop button, a fuse, a first changeover switch, a second changeover switch, a time relay, a gas probe, a temperature measuring probe, a forced start button and an alarm device. The auxiliary contact of the contactor is connected in series with the normally open contact of the time relay and then connected to the three-phase AC power supply through the fuse. The coil of the time relay, the second changeover switch connected in parallel with the forced start button, the first changeover switch and the emergency stop button are connected in series in sequence and then connected to the three-phase AC power supply through the fuse. The alarm device and the auxiliary contacts of each thermal relay are respectively connected in series. The auxiliary contacts of each thermal relay, the gas probe and the temperature measuring probe are connected in parallel and then connected to the three-phase AC power supply through the fuse;

[0007] The gas probe is used for real-time monitoring of flammable, explosive, toxic and harmful gases, the temperature probe is used for real-time monitoring of the ambient temperature, and the first change-over switch is used to control the conversion of the axial flow fan between the manual state and the automatic state.

[0008] According to some embodiments of the present application, the main circuit includes three axial flow fans and three thermal relays. The axial flow fans and the thermal relays are in one-to-one correspondence. The axial flow fans are connected in series with the corresponding thermal relays, and the three thermal relays are connected in parallel. The alarm device and the auxiliary contacts of the three thermal relays are respectively connected in series. The auxiliary contacts of the three thermal relays, the gas probe and the temperature probe are connected in parallel and then connected to the three-phase AC power supply through the fuse.

[0009] According to some embodiments of the present application, the alarm device includes three alarm indicator lights. The alarm indicator lights and the axial flow fans are in one-to-one correspondence. Each alarm indicator light is connected in series with the corresponding axial flow fan and then connected to the three-phase AC power supply through the fuse.

[0010] According to some embodiments of the present application, the power distribution equipment of the automatic control axial flow fan further includes a first intermediate relay and a second intermediate relay. One end of the normally open contacts of the first intermediate relay, the normally open contacts of the second intermediate relay, the second change-over switch and the forced start button connected in parallel is connected in series with the coil of the time relay, and the other end of the parallel connection is connected to the three-phase AC power supply through the fuse; the coil of the first intermediate relay is connected in series with the temperature probe and then connected to the three-phase AC power supply through the fuse, and the coil of the second intermediate relay is connected in series with the gas probe and then connected to the three-phase AC power supply through the fuse.

[0011] According to some embodiments of the present application, the power distribution equipment of the automatic control axial flow fan further includes a first audible and visual alarm and a second audible and visual alarm. The first audible and visual alarm is connected in parallel with the first intermediate relay and then connected to the three-phase AC power supply through the temperature probe and the fuse in sequence, and the second audible and visual alarm is connected in parallel with the second intermediate relay and then connected to the three-phase AC power supply through the gas probe and the fuse in sequence.

[0012] According to some embodiments of the present application, the power distribution equipment of the self - controlled axial - flow fan further includes a neutral line. One end of the time - relay coil away from the second change - over switch, one end of the contactor away from the normally - open contact of the time - relay, one end of the first intermediate relay away from the temperature - measuring probe, one end of the second intermediate relay away from the gas probe, and one end of the alarm indicator away from the corresponding axial - flow fan are all connected to the neutral line.

[0013] In the present application, the axial - flow fans of each scattered branch are centrally controlled through the centralized control cabinet of the axial - flow fan. The number of controls can be reasonably configured according to the fan power and environmental requirements, saving costs. A circuit breaker and a contactor are configured in the main circuit, and a corresponding thermal relay is configured for each axial - flow fan to respectively achieve overload indication of the circuit. A first change - over switch is set in the control circuit to realize the mutual switching between the automatic state and the manual state. The automatic - control circuit can realize the automatic control of temperature, combustible gas, and toxic and harmful gases. When a fault occurs during the automatic control of the axial - flow fan, the axial - flow fan can be manually started to replace the air and achieve cooling. By setting a time - relay, the delayed disconnection and delayed closing of the axial - flow fan can be controlled to achieve the automatic control of the working time of the axial - flow fan and avoid the frequent start - stop of the axial - flow fan. By setting an alarm device, real - time monitoring and alarm can be realized when the temperature is too high or there are toxic and harmful gases. By setting an emergency - stop button, the power supply can be cut off in case of an emergency. Through this setting of the present application, the axial - flow fans of each scattered branch are centrally controlled, the automatic control of temperature, combustible gas, and toxic and harmful gases can be realized, the service life of the axial - flow fan can be extended, the maintenance frequency of the axial - flow fan can be reduced, the maintenance cost can be lowered, and the maintenance labor intensity can be alleviated.

[0014] Some additional aspects and advantages of the present application will be given in part in the following description, some will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The additional aspects and advantages of the present application will become obvious and easy to understand in the description of the embodiments in conjunction with the following drawings, where:

[0016] Figure 1 is the main circuit of the centralized control cabinet of the axial - flow fan provided by the embodiment of the present application;

[0017] Figure 2 is the control circuit of the centralized control cabinet of the axial - flow fan provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0019] In the description of the present application, it should be understood that with respect to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application 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 should not be construed as a limitation of the present application.

[0020] In the description of the present application, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0021] In the description of the present application, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0022] Currently, in many places, there may be high temperatures, flammable, explosive, toxic, and harmful gases, such as the pump rooms, substations of gas filling stations, and workshops of chemical plants. In these places, axial fans operating 24 hours a day are usually used for heat dissipation and air replacement. However, the axial fans used in these places operate 24 hours a day, which is not conducive to energy conservation, and the equipment aging and wear are accelerated, increasing the maintenance cost. At the same time, manual operation is required, automatic control cannot be achieved, the fan cannot be started and stopped according to actual needs, and over-temperature alarm, alarm for flammable, explosive, toxic, and harmful gas concentration exceeding the standard cannot be achieved.

[0023] To solve the above problems, the present application proposes a power distribution device for an automatic control axial fan. The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0024] Refer to Figures 1 to 2, this application provides a power distribution device for a self - controlled axial - flow fan, including: an axial - flow fan centralized control cabinet and at least two axial - flow fans; the axial - flow fan centralized control cabinet includes a main circuit and a control circuit. The main circuit includes a three - phase AC power supply, a circuit breaker, a contactor, and at least two axial - flow fans. Each axial - flow fan is respectively provided with a thermal relay. Each axial - flow fan is connected in series with the corresponding thermal relay, and each thermal relay is connected in parallel. The main contacts of each thermal relay are connected in series with the main contacts of the contactor, the circuit breaker, and the three - phase AC power supply in sequence; the control circuit includes an emergency stop button, a fuse, a first switch, a second switch, a time relay, a gas detector, a temperature detector, a forced start button, and an alarm device. The auxiliary contact of the contactor is connected in series with the normally - open contact of the time relay and then connected to the three - phase AC power supply through a fuse. The coil of the time relay, the second switch connected in parallel with the forced start button, the first switch, and the emergency stop button are connected in series in sequence and then connected to the three - phase AC power supply through a fuse. The alarm device and the auxiliary contacts of each thermal relay are respectively connected in series. The auxiliary contacts of each thermal relay, the gas detector, and the temperature detector are connected in parallel and then connected to the three - phase AC power supply through a fuse; the gas detector is used for real - time monitoring of flammable, explosive, toxic, and harmful gases, the temperature detector is used for real - time monitoring of the surrounding temperature, and the first switch is used to control the conversion of the axial - flow fan between the manual state and the automatic state.

[0025] It should be noted that the three - phase AC power supply includes three phase lines (live wires). The AC voltage phases generated by the three coils of the three - phase AC power supply differ by 120°. When the three coils are connected in a star connection, the line voltage is equal to the phase voltage multiplied by the square root of 3.

[0026] It should be noted that in Figure 1 and Figure 2 : L1, L2, and L3 respectively represent the three phase lines, QF represents the circuit breaker, KM represents the contactor, FR1, FR2, and FR3 respectively represent the thermal relays corresponding to the three axial - flow fans, M represents the axial - flow fan, FU represents the fuse, SB represents the emergency stop button, SA1 represents the first switch, SA2 represents the second switch, U1 represents the manual switching position of the first switch, U2 represents the automatic switching position of the first switch, KA1 represents the first intermediate relay, KA2 represents the second intermediate relay, Y represents the forced start button, KT represents the time relay, SN1 represents the first audible and visual alarm, SN2 represents the second audible and visual alarm, X1 represents the temperature detector, X2 represents the gas detector, HY1, HY2, and HY3 represent the alarm indicator lights corresponding to the three thermal relays, and N represents the neutral line.

[0027] It should be noted that the gas probe is used to monitor inflammable, explosive, toxic and harmful gases in real time. When inflammable, explosive, toxic and harmful gases appear, the normally open electric contact of the gas probe is closed, the automatic control circuit is energized, and the axial flow fan starts to work to disperse the inflammable, explosive, toxic and harmful gases to the outside to achieve air replacement. At the same time, the alarm device sends an alarm indication to warn the staff to leave in time, or manually start the axial flow fan to start working; when the temperature probe is used to monitor the temperature in the current place in real time, when the monitored temperature exceeds the preset temperature threshold, the normally open electric contact of the temperature probe is closed, the automatic control circuit is energized, and the axial flow fan starts to work to cool down. At the same time, the alarm device sends an alarm indication to warn the staff to leave in time, or manually start the axial flow fan to start cooling down. That is, by setting up the alarm device, real-time monitoring and alarm of over-temperature and toxic and harmful gases can be achieved, ensuring the safety of patrol personnel.

[0028] It should be noted that by setting a forced start button, it can be used in occasions with special requirements, and connected to the DCS distributed control system and fire protection system as needed to achieve rapid commissioning of the axial flow fan, provide protection for personnel evacuation and accident rescue, and eliminate safety hazards.

[0029] It should be noted that the present application adopts automatic precise control, which turns on when necessary and turns off when unnecessary, thereby saving electricity, extending the service life of the axial flow fan, reducing the maintenance frequency of the axial flow fan, reducing maintenance costs, and reducing maintenance labor intensity.

[0030] In the present application, the axial flow fans of each branch are centrally controlled through an axial flow fan centralized control cabinet. The number of controls can be reasonably configured according to the fan power and environmental requirements to save costs. Circuit breakers and contactors are configured in the main circuit, and corresponding thermal relays are configured for each axial flow fan, so that circuit overload indication can be realized respectively. A first conversion switch is set in the control circuit to realize the mutual switching between automatic state and manual state. The automatic control circuit can realize automatic control of temperature, combustible gas, toxic and harmful gas. When a failure occurs in the automatic control process of the axial flow fan, the axial flow fan can be manually started to replace the air and realize cooling. By setting a time relay, the delayed opening and delayed closing of the axial flow fan can be controlled to achieve automatic control of the working time of the axial flow fan and avoid frequent start and stop of the axial flow fan. By setting an alarm device, real-time monitoring and alarm can be realized in the event of overtemperature or toxic and harmful gas. By setting an emergency stop button, the power supply can be cut off in an emergency. Through this setting, the present application centrally controls the axial flow fans of each branch that are dispersed, and can achieve automatic control of temperature, combustible gases, and toxic and harmful gases. At the same time, it extends the service life of the axial flow fan, reduces the maintenance frequency of the axial flow fan, reduces maintenance costs, and reduces maintenance labor intensity.

[0031] Reference Figure 1 andFigure 2 It can be understood that the main circuit includes three axial flow fans and three thermal relays. The axial flow fans and the thermal relays are in one-to-one correspondence. The axial flow fans are connected in series with the corresponding thermal relays, and the three thermal relays are connected in parallel. The alarm device and the auxiliary contacts of the three thermal relays are respectively connected in series. The auxiliary contacts of the three thermal relays, the gas probe and the temperature measuring probe are connected in parallel and then connected to the three-phase AC power supply through a fuse.

[0032] It should be noted that by centrally controlling the three axial flow fans and configuring a thermal relay for each axial flow fan, the loop overload indication can be realized respectively.

[0033] Refer to Figure 2 It can be understood that the alarm device includes three alarm indicator lights. The alarm indicator lights and the axial flow fans are in one-to-one correspondence. Each alarm indicator light is connected in series with the corresponding axial flow fan and then connected to the three-phase AC power supply through a fuse.

[0034] It should be noted that each alarm indicator light is connected in series with the corresponding axial flow fan and then connected to one of the three phase lines of the three-phase AC power supply through a fuse. By setting the alarm indicator lights, the real-time monitoring and alarm display of over-temperature and toxic and harmful gases are realized, ensuring the safety of the inspection personnel.

[0035] Refer to Figure 2 It can be understood that the power distribution equipment of the automatic control axial flow fan further includes a first intermediate relay and a second intermediate relay. One end of the normally open contacts of the first intermediate relay, the normally open contacts of the second intermediate relay, the second changeover switch and the forced start button connected in parallel is connected in series with the coil of the time relay, and the other end of the parallel connection is connected to the three-phase AC power supply through a fuse; the coil of the first intermediate relay is connected in series with the temperature measuring probe and then connected to the three-phase AC power supply through a fuse, and the coil of the second intermediate relay is connected in series with the gas probe and then connected to the three-phase AC power supply through a fuse.

[0036] It should be noted that the fuse is connected in series with one of the phase lines of the three-phase AC power supply. In this embodiment, the fuse is connected in series with the third phase line L3 of the three-phase AC power supply.

[0037] It should be noted that both ends of the parallel connection of the normally open contacts of the first intermediate relay and the normally open contacts of the second intermediate relay are respectively connected to the series common point of the second changeover switch and the time relay coil, and the series common point of the second changeover switch and the first changeover switch. Through the first intermediate relay and the second intermediate relay, the composition of the automatic control loop of the axial flow fan in the control loop is realized, and the automatic control of the axial flow fan is realized, and then the automatic control of temperature, combustible gas and toxic and harmful gas is realized.

[0038] Refer to Figure 2, it can be understood that the power distribution equipment of the automatic control axial flow fan further includes a first audible and visual alarm and a second audible and visual alarm. The first audible and visual alarm is connected in parallel with the first intermediate relay and then connected to the three-phase AC power supply through a temperature measuring probe and a fuse in sequence. The second audible and visual alarm is connected in parallel with the second intermediate relay and then connected to the three-phase AC power supply through a gas probe and a fuse in sequence.

[0039] In this embodiment, both the first audible and visual alarm and the second audible and visual alarm are buzzers. The buzzer generates continuous or intermittent sound signals to play roles such as prompting, alarming, warning, and reminding. The first audible and visual alarm and the second audible and visual alarm are used for real-time monitoring and alarming when overheating or toxic and harmful gases occur, so as to better remind the staff and ensure the safety of the patrol personnel.

[0040] Refer to Figure 2 , it can be understood that the power distribution equipment of the automatic control axial flow fan further includes a neutral line. One end of the time relay coil far from the second changeover switch, one end of the contactor far from the normally open contact of the time relay, one end of the first intermediate relay far from the temperature measuring probe, one end of the second intermediate relay far from the gas probe, and one end of the alarm indicator far from the corresponding axial flow fan are all connected to the neutral line.

[0041] It should be noted that the voltage between each phase wire (live wire) and the neutral wire (neutral line) is called the phase voltage, and the voltage between phase wires is called the line voltage. The neutral line and the three live wires in the three-phase AC power supply form a loop to ensure the normal operation of the power distribution equipment of the automatic control axial flow fan.

[0042] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0043] The above is the preferred embodiment of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present application.

[0044] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A power distribution device for an automatic axial flow fan, characterized in that: include: Axial flow fan centralized control cabinet and at least two axial flow fans; The axial flow fan centralized control cabinet includes a main circuit and a control circuit, the main circuit includes a three-phase AC power supply, a circuit breaker, a contactor and at least two axial flow fans, each axial flow fan is respectively provided with a corresponding thermal relay, each axial flow fan is connected in series with the corresponding thermal relay, each thermal relay is connected in parallel, and the main contact of each thermal relay is connected in series with the main contact of the contactor, the circuit breaker and the three-phase AC power supply in sequence; The control circuit includes an emergency stop button, a fuse, a first conversion switch, a second conversion switch, a time relay, a gas probe, a temperature measuring probe, a forced start button and an alarm device. The auxiliary contact of the contactor is connected in series with the normally open contact of the time relay and then connected to the three-phase AC power supply through the fuse. The coil of the time relay, the second conversion switch connected in parallel, the forced start button, the first conversion switch, and the emergency stop button are sequentially connected in series and then connected to the three-phase AC power supply through the fuse. The alarm device and the auxiliary contacts of each of the thermal relays are respectively connected in series. The auxiliary contacts of each of the thermal relays, the gas probe and the temperature measuring probe are connected in parallel and then connected to the three-phase AC power supply through the fuse. The gas probe is used for real-time monitoring of inflammable, explosive, toxic and harmful gases, the temperature probe is used for real-time monitoring of the ambient temperature, and the first conversion switch is used to control the conversion of the axial flow fan between manual state and automatic state.

2. The power distribution equipment of the automatic axial flow fan according to claim 1, characterized in that: The main circuit includes three axial flow fans and three thermal relays. The axial flow fans correspond to the thermal relays one by one. The axial flow fans are connected in series with the corresponding thermal relays. The three thermal relays are connected in parallel. The alarm device and the auxiliary contacts of the three thermal relays are respectively connected in series. The auxiliary contacts of the three thermal relays, the gas probe and the temperature probe are connected in parallel and then connected to the three-phase AC power supply through the fuse.

3. The power distribution equipment of the automatic axial flow fan according to claim 2, characterized in that: The alarm device includes three alarm indicator lights, which correspond to the axial flow fans one by one. Each of the alarm indicator lights is connected in series with the corresponding axial flow fan and then connected to the three-phase AC power supply through the fuse.

4. The power distribution equipment of the automatic axial flow fan according to claim 3, characterized in that: The power distribution equipment of the automatic axial flow fan also includes a first intermediate relay and a second intermediate relay. The normally open contact of the first intermediate relay, the normally open contact of the second intermediate relay, the second conversion switch and the forced start button are connected in parallel, and one end is connected in series with the coil of the time relay, and the other end after the parallel connection is connected to the three-phase AC power supply through the fuse; the coil of the first intermediate relay is connected in series with the temperature probe and then connected to the three-phase AC power supply through the fuse, and the coil of the second intermediate relay is connected in series with the gas probe and then connected to the three-phase AC power supply through the fuse.

5. The power distribution equipment of the automatic axial flow fan according to claim 4, characterized in that: The power distribution equipment of the automatic axial flow fan also includes a first sound and light alarm and a second sound and light alarm. The first sound and light alarm is connected in parallel with the first intermediate relay and is connected to the three-phase AC power supply through the temperature measuring probe and the fuse in sequence. The second sound and light alarm is connected in parallel with the second intermediate relay and is connected to the three-phase AC power supply through the gas probe and the fuse in sequence.

6. The power distribution equipment of the automatic axial flow fan according to claim 5, characterized in that: The power distribution equipment of the automatic axial flow fan also includes a neutral line, and one end of the time relay coil away from the second switching switch, one end of the contactor away from the normally open contact of the time relay, one end of the first intermediate relay away from the temperature measuring probe, one end of the second intermediate relay away from the gas probe, and one end of the alarm indicator light away from the corresponding axial flow fan are all connected to the neutral line.

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