CN104895822A - Smoke detector-Linked fan control box - Google Patents

Abstract

The present invention proposes a smoke sensor linkage fan control box, including a switching power supply, the live wire end of which is connected to the external power box through a second air switch, the neutral wire end is connected to the neutral wire, and the positive pole of the power supply is connected through a smoke detector and an intermediate relay Its negative pole also includes a transfer switch, the second contact of which leads to the local manual control circuit, the fourth contact leads to the temperature control circuit; the sixth contact leads to the forced smoke exhaust circuit; the first, third and fifth contacts are all connected to the first One end of the three-air switch, the terminal is also connected to the zero line through the temperature and humidity detector, and the second normally open contact of the contactor and the signal light are connected to the zero line; the other end is connected to the first air switch and the first normally open contactor On the C-phase AC power line between the contacts, one end of the three contacts of the first air switch is connected to the three-phase power of the power box, and the other end is correspondingly connected to the first normally open contact of the contactor, and the other end of the normally open contact Connect the three-phase electrical interface of the fan. The above-mentioned control box can cut off the power supply of the blower fan in the event of a fire.

Description

A smoke sensor linkage fan control box

technical field

The invention relates to the field of electric power, in particular to a smoke sensor linkage fan control box.

Background technique

Under the current situation, not all substations are newly built. Some substations are formed by rebuilding and expanding small warehouses and workshops. In order to meet the needs of heating and ventilation, these rebuilt substations will require the addition of axial flow fans. The fire engine or the fire engine has no backup outlet. Once a fire occurs, the fan system will not automatically stop running, which will inevitably cause the fire to expand due to ventilation.

Contents of the invention

In order to solve the above problems, the present invention proposes a smoke sensor linkage fan control box, so that when a fire occurs, the power supply of the fan can be cut off in time to prevent the fire from expanding due to ventilation.

In order to achieve the above object, the present invention proposes a smoke sensor linkage fan control box, including a switching power supply, the live wire end of the switching power supply is connected to the 220V AC power line in the external power box through the second air switch, and the switching power supply The neutral end of the switching power supply is connected to the neutral line, the positive pole of the switching power supply is connected to one end of the smoke detector, and the other end of the smoke detector is connected to the negative pole of the switching power supply through an intermediate relay; the smoke detector The linkage fan control box also includes a transfer switch, and the transfer switch includes three sets of contacts, wherein the first and second contacts are the first set, the third and fourth contacts are the second set, and the fifth and sixth contacts are the second set. Three groups, the second contact of the changeover switch is connected to the third normally open contact of the parallel first jog button and the contactor through the second jog button, and the above parallel circuit is connected to the first normally open contact of the intermediate relay The closed contact and the contactor are connected to the neutral line, wherein the initial state of the second jog button is a closed state, and the initial state of the first jog button is an open state; the fourth contact of the transfer switch One end of the detection contact connected to the temperature and humidity detector, the other end of the detection contact of the temperature and humidity detector is connected to the neutral line through the first normally closed contact of the intermediate relay and the contactor; the changeover switch The sixth contact of the switch is connected to the neutral line through the contactor; the first contact, the third contact and the fifth contact of the transfer switch are all connected to one end of the third air switch, and the above-mentioned The terminal is also connected to the neutral line through the temperature and humidity detector, and the above-mentioned terminal of the third air switch is also connected to the neutral line through the second normally open contact of the contactor and the signal light; the other end of the third air switch is connected to On the C-phase AC power line between the first air switch and the first normally open contact of the contactor, the first air switch has three contacts, and one end of the three contacts is connected to the external power box A three-phase AC power line, the other end of the three contacts is connected to one end of the first normally open contact of the contactor, and the first normally open contact of the contactor also includes three contacts, And these three contacts are correspondingly connected with the three contacts of the first air switch, and the other end of the first normally open contact of the contactor is used to connect the three-phase electrical interface of the fan.

The beneficial effect of this solution of the present invention is that the above-mentioned smoke sensor linkage fan control box can control the operation of the fan according to the detected temperature value and humidity value; and when a fire occurs, the power supply of the fan can be cut off to prevent the fire caused by ventilation Expansion: The control box for the smoke sensor linkage fan involved in the present invention also has the functions of forced smoke exhaust and manual control of fan operation.

Description of drawings

Fig. 1 shows the schematic circuit diagram of the smoke sensor linkage fan control box involved in the present invention.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the smoke sensor linkage fan control box 101 involved in the present invention is powered by an external power box 102. A contact is connected to one end of the first normally open contact KM1 of the contactor KM, the first normally open contact KM1 of the contactor KM also includes three contacts, and these three contacts are connected with the first air switch The three contacts of QF1 are connected one by one, and the other end of the first normally open contact KM1 of the contactor KM is respectively connected to the three-phase electrical interface of the fan F; the 220V AC power line L in the power box 102 The second air switch QF2 is connected to the live line L terminal of the switching power supply CP, and the neutral line N terminal of the switching power supply CP is connected to the neutral line N; the switching power supply CP can rectify the above-mentioned 220V alternating current into 24V or 12V direct current, Specifically, which DC voltage value the 220V AC is rectified into is determined by the working voltage of the smoke detector H; the positive pole of the switching power supply CP is connected to one end of the smoke detector H, and the smoke detector H The other end of the switch is connected to the negative pole of the switching power supply CP through the intermediate relay KA; the wire drawn from the C-phase AC power line between the first air switch QF1 and the first normally open contact KM1 of the contactor KM is connected to One end of the third air switch QF3, the other end of the third air switch QF3 is connected to the neutral line N through the temperature and humidity detector WSD; the other end of the third air switch QF3 is also connected through the second normally open contactor KM The contact KM2 and the signal lamp HR1 are connected to the neutral line N; the other end of the third air switch QF3 is also connected to the first contact 1, the third contact 3 and the fifth contact 5 of the transfer switch SA. The switch SA includes three groups of contacts 1-2, 3-4, 5-6, which are used to control the conversion of the three circuits, so the second contact 2 of the changeover switch SA is connected to the parallel connection via the second jog button SB2 The first jog button SB1 and the third normally open contact KM3 of the contactor KM, the above parallel circuit is connected to the neutral line N through the first normally closed contact KA1 of the intermediate relay KA and the contactor KM, the circuit is called It is an on-site manual control circuit, controlled by the first set of contacts 1-2 of the transfer switch SA, wherein the initial state of the second jog button SB2 is closed, and the initial state of the first jog button SB1 is Off state: the fourth contact 4 of the transfer switch SA is connected to one end of the detection contact WSD1 of the temperature and humidity detector WSD, and the other end of the detection contact WSD1 of the temperature and humidity detector WSD is passed through the intermediate relay The first normally closed contact KA1 of KA and the contactor KM are connected to the neutral line N, and this circuit is called the temperature control circuit, which is controlled by the second group of contacts 3-4 of the transfer switch SA; the transfer switch SA The sixth contact 6 is connected to the neutral line N through the contactor KM, and this circuit is called the forced smoke exhaust circuit, which is controlled by the third group of contacts 5-6 of the transfer switch SA.

The smoke sensor linkage fan control box 101 involved in the present invention can also be provided with the fourth normally open contact KM4 of the contactor KM as a spare, so as to control the on-off of the circuit when other circuits are added later.

In this embodiment, the switching power supply CP rectifies 220V AC power into 24V DC power as an example for illustration. In a specific working process, in order to ensure power supply to the fan control box 101 , the first air switch QF1 , the second air switch QF2 and the third air switch QF3 are all closed. In order to ensure that the detection contact WSD1 of the temperature and humidity detector WSD works normally, the temperature and humidity detector WSD is always in a power-on state, and the temperature and humidity detector WSD has a preset temperature and humidity threshold, for example, the temperature threshold is 35 degrees Celsius , the humidity threshold is 90%, when the detection contact WSD1 of the temperature and humidity detector WSD detects that the temperature and/or humidity of the current environment is higher than the threshold, the detection contact WSD1 of the temperature and humidity detector WSD will be closed.

When there is no fire, adjust the transfer switch SA to the second group of contacts 3-4, so that the temperature control circuit is connected to the third air switch QF3; since there is no fire, the smoke detector H The smoke contact is disconnected, so that the intermediate relay KA is de-energized, and when the intermediate relay KA is de-energized, its first normally closed contact KA1 is closed; at this time, the detection contact WSD1 of the temperature and humidity detector WSD will Detect the temperature value and humidity value of the current environment. When the detection contact WSD1 of the temperature and humidity detector WSD detects that the temperature and/or humidity of the current environment is higher than a threshold value, the detection contact WSD1 of the temperature and humidity detector WSD will be closed, which makes the contactor KM energized, and then makes all the normally open contacts of the contactor KM closed, when the first normally open contact KM1 of the contactor KM is closed, the fan F When the second normally open contact KM2 of the contactor KM is closed, the signal lamp HR1 lights up, indicating that the fan F is working. When the detection contact WSD1 of the temperature and humidity detector WSD detects that the temperature and humidity of the current environment are lower than the threshold value, the detection contact WSD1 of the temperature and humidity detector WSD will be disconnected, which makes the contactor KM fail. electricity, and then all the normally open contacts of the contactor KM are disconnected, and when the first normally open contact KM1 of the contactor KM is disconnected, the fan F stops running; when the first normally open contact KM1 of the contactor KM is disconnected; When the two normally open contacts KM2 are disconnected, the signal lamp HR1 goes out, indicating that the fan F stops working.

When a fire occurs, the smoke contact of the smoke detector H is closed, so that the intermediate relay KA is energized, and when the intermediate relay KA is energized, its first normally closed contact KA1 will be disconnected; this so that the contactor KM will lose power, and then all the normally open contacts of the contactor KM are disconnected, and when the first normally open contact KM1 of the contactor KM is disconnected, the fan F stops To prevent the expansion of the fire caused by ventilation; when the second normally open contact KM2 of the contactor KM is disconnected, the signal lamp HR1 goes out, indicating that the fan F stops working.

When a fire occurs, due to the high smoke concentration, the smoke contact of the smoke detector H is still in the closed state, and the first normally closed contact KA1 of the intermediate relay KA is still in the open state. For smoke exhaust work, it is necessary to adjust the transfer switch SA to the third group of contacts 5-6, so that the forced smoke exhaust circuit is connected to the third air switch QF3; at this time, the contactor KM is energized, so that all Each normally open contact of the contactor KM is closed, and when the first normally open contact KM1 of the contactor KM is closed, the fan F is energized and starts running to realize the functions of ventilation and smoke exhaust; When the second normally open contact KM2 of the device KM is closed, the signal lamp HR1 is lit, indicating that the fan F is working.

When there is no fire and the temperature and humidity of the current environment are lower than the threshold value, in order to make the fan F run, the transfer switch SA can be adjusted to the first group of contacts 1-2, so that the local manual control circuit Connected to the third air switch QF3; since there is no fire, the smoke contact of the smoke detector H is in an open state, and the first normally closed contact KA1 of the intermediate relay KA is in a closed state; jog Trigger the first jog button SB1, when the first jog button SB1 is closed, the contactor KM is energized, so that each normally open contact of the contactor KM is closed, when the contactor KM When the third normally open contact KM3 of the contactor KM is closed, the charged state of the circuit is maintained. When the first normally open contact KM1 of the contactor KM is closed, the fan F is energized and starts running to realize Ventilation function; when the second normally open contact KM2 of the contactor KM is closed, the signal lamp HR1 is lit, indicating that the fan F is working. When the fan F needs to stop running, the second jog button SB2 is jogged, and when the second jog button SB2 is turned off, the contactor KM is de-energized, so that each of the contactors KM The normally open contacts are all disconnected. When the third normally open contact KM3 of the contactor KM is disconnected, the power-off state of the circuit is maintained. When the first normally open contact of the contactor KM When KM1 is disconnected, the fan F stops running; when the second normally open contact KM2 of the contactor KM is disconnected, the signal lamp HR1 goes out, indicating that the fan F stops working.

The smoke sensor linkage fan control box involved in the present invention can control the operation of the fan according to the detected temperature value and humidity value; and in the event of a fire, it can cut off the power supply of the fan to prevent the fire from expanding due to ventilation; The involved smoke sensor linkage fan control box also has the functions of forced smoke exhaust and manual control of fan operation.

Claims (1)

1. a cigarette sense linkage fan control box, it is characterized in that: comprise switch power, the live wire end of described switch power is connected to the 220V AC power cord in external impetus case through the second air-break switch, the zero line side of described switch power is connected to zero line, the positive source of described switch power is connected to one end of smoke alarm, and the other end of described smoke alarm is connected to the negative pole of described switch power through auxiliary reclay, described cigarette sense linkage fan control box also comprises throw over switch, described throw over switch comprises three groups of contacts, wherein first, two contacts are first group, 3rd, four contacts are second group, 5th, six contacts are the 3rd group, second contact second inching button of described throw over switch is connected to the first inching button in parallel and the 3rd normally opened contact of contactor, above-mentioned parallel circuit is connected to zero line through the first normally-closed contact of described auxiliary reclay and contactor, the original state of wherein said second inching button is closed state, the original state of described first inching button is off state, 4th contact of described throw over switch is connected to one end of the detection contact of temperature and humidity prober, and the other end of the detection contact of described temperature and humidity prober is connected to zero line through the first normally-closed contact of described auxiliary reclay and contactor, 6th contact of described throw over switch is connected to zero line through contactor, first contact of described throw over switch, the 3rd contact and the 5th contact are all connected to one end of the 3rd air-break switch, the above-mentioned end points of described 3rd air-break switch is also connected to zero line through temperature and humidity prober, and the above-mentioned end points of described 3rd air-break switch is also connected to zero line through the second normally opened contact of contactor and signaling lamp, the other end of described 3rd air-break switch is connected on the C cross streams power line between the first air-break switch and the first normally opened contact of contactor, described first air-break switch has three contacts, one end of described three contacts is connected to the three-phase ac power cord in external impetus case, the other end of described three contacts is connected to one end of the first normally opened contact of described contactor, first normally opened contact of described contactor also comprises three contacts, and three corresponding connections in contact of these three contacts and described first air-break switch, the other end of the first normally opened contact of described contactor is used for the three-phase electricity interface of connecting fan.