WO2021147578A1

WO2021147578A1 - Sliding control mode circuit of motor with gravity compensation for fire and smoke curtain

Info

Publication number: WO2021147578A1
Application number: PCT/CN2020/137152
Authority: WO
Inventors: 刘王雍杰; 刘乐; 王绍斌
Original assignee: 福建安麟智能科技股份有限公司
Priority date: 2020-01-21
Filing date: 2020-12-17
Publication date: 2021-07-29
Also published as: CN211791351U

Abstract

A sliding control mode circuit of a motor with gravity compensation for fire and smoke curtain, comprising a controller (1), a two-way relay (2), a motor coil (3), a bridge stack (4), a capacitor (5) and a MOS transistor (6); a normally open contact of the two-way relay (2) is connected to a port 1 of the controller (1) and a port 2 of the motor coil (3), a normally closed contact of the two-way relay (2) is connected to a positive electrode of the bridge stack (4) and the drain electrode of the MOS transistor (6), and the capacitor (5) is connected in parallel to the bridge stack (4). The sliding control mode circuit of a motor with gravity compensation for fire and smoke curtain can effectively control the rotational speed of the motor, when an external power supply is turned off or short-circuited, the normally closed contact of the two-way relay (2) is closed, and the circuits at two ends of the MOS transistor (6) are turned on, and the motor starts to slide under gravity, the motor generates power, the voltage at two ends of the motor increases, and the rotational speed of the motor increases; and when the voltage increases to the conduction voltage of the MOS transistor (6), the MOS transistor (6) is conducted, the voltage of the motor decreases, and the rotational speed of the motor decreases, ensuring that the descending speed of a curtain is within a controllable range.

Description

Gravity sliding control circuit of fire-proof and smoke-proof motor

Technical field

The invention relates to the technical field of fire-proof and smoke-proof vertical wall control, in particular to a gravity sliding control circuit of a fire-proof and smoke-proof motor.

Background technique

The fire-proof and smoke-proof wall is mainly used to block the spread of smoke. It is mainly used in high-rise or super high-rise shopping malls, office buildings, warehouses and other occasions. It can effectively block the horizontal flow of smoke under the building ceiling, which is beneficial to improve the smoke prevention zone. The smoke exhaust effect plays a positive role in ensuring the safety of people's lives and property. In the event of an accident, the smoke blocking wall is lowered by its own weight. At present, the smoke blocking wall adopts two methods: one is to release the brake after the fuse is blown, and the smoke blocking wall slides under the action of gravity, the other is When the external power supply is cut off, the brake is automatically released, and the smoke blocking wall slides down under the action of gravity. When the motor rotates and the smoke-blocking wall slides down, the sliding speed is very fast, and there is a big safety hazard, which is not conducive to the safety of the escaped below.

As a result, the rapid descent of the smoke shielding wall becomes an urgent problem to be solved. For example, the Chinese patent utility model patent CN208128149U discloses a dual-capacitor AC rolling door motor circuit, which includes a main circuit, a brake circuit and a control circuit; the main circuit Including power supply, main switch, two normally open contacts of the upstream relay, two normally open contacts of the downstream relay, single-phase AC motor; brake circuit with brake rectifier bridge and brake electromagnetic coil; also includes low-voltage DC power supply circuit , Time relay, starting capacitor and running capacitor; low-voltage DC power supply circuit includes transformer, power rectifier bridge stack and shaping capacitor; time relay coil is connected to the input end of brake rectifier bridge stack; starting capacitor and the normally closed contact of time relay are connected in series The forward terminal and the reverse terminal of the single-phase AC motor; the running capacitor is connected to the forward terminal and the reverse terminal of the single-phase AC motor.

Although the above patent uses the brake rectifier bridge stack and the brake solenoid to control the speed of the motor and thus the speed of the rolling door, it still has the following shortcomings: 1. When the rolling door is stopped, the switch needs to be manually pressed, and the brake cannot be automatically realized. Function; 2. The circuit is complex, which not only increases the probability of circuit failure, but also increases the cost.

Technical solutions

The purpose of the present invention is to provide a gravity sliding control circuit for a fire-proof smoke-proof motor, so as to solve the problem of the fire-proof smoke-proof wall falling too fast when the external circuit is short-circuited or a fire alarm occurs.

The present invention provides a gravity sliding control circuit for a fire-proof smoke shield motor, which includes a controller, a dual-circuit relay, a motor coil, a bridge stack, a capacitor, and a MOS tube. The normally open contact of the dual-circuit relay is connected to the controller of the controller. No. port and No. 2 port of the motor coil, the normally closed contact of the dual-circuit relay is connected to the anode of the bridge stack and the drain of the MOS transistor, and the capacitor is connected in parallel to the bridge stack.

As a preference of the present invention, the drain and the gate of the MOS tube are connected to a first resistor for current leakage. The function of the first resistor is to bleed current.

As a preference of the present invention, the capacitor is an electrolytic capacitor. The electrolytic capacitor has a large capacity, a high rated voltage, and a large operating temperature range.

As a preference of the present invention, the gate of the MOS transistor is grounded through a second resistor. The function of the second resistor is to prevent the MOS tube from floating, making the circuit voltage more stable.

As a preference of the present invention, the positive pole of the capacitor is connected to the positive pole of the bridge stack and the normally closed contact point of the dual-circuit relay. When the external power supply is disconnected or short-circuited, the discharge of the motor coil is absorbed by the capacitor and stored until it reaches the turn-on voltage of the MOS tube.

As a preference of the present invention, the negative electrode of the capacitor is connected to the negative electrode of the bridge stack.

As a preference of the present invention, the MOS tube is an N-channel MOS tube.

Beneficial effect

By implementing the above technical solutions, the present invention has the following beneficial effects:

1. The present invention can effectively control the speed of the motor. When the external power supply is disconnected or short-circuited, the normally closed contact points of the two-way relay are closed, and the circuits at both ends of the MOS tube are connected. The motor starts to slide with gravity, and the motor generates power. When the voltage at the terminal rises, the speed of the motor speeds up. When the voltage rises to the turn-on voltage of the MOS tube, the MOS tube is turned on, the motor voltage drops, and the motor speed slows down to ensure that the falling speed of the vertical wall is within the controllable range.

2. The present invention has exquisite design, simple circuit, reduced cost, and strong versatility.

Description of the drawings

The drawings incorporated into the specification and constituting a part of the specification illustrate the embodiments of the present invention, and together with the description, serve to explain the principle of the present invention. In these drawings, similar reference numerals are used to indicate similar elements. The drawings in the following description are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

Fig. 1 is a circuit diagram of a gravity sliding control circuit of a fire-proof and smoke-proof motor according to an embodiment of the present invention.

Fig. 2 is a partial circuit diagram of a gravity sliding control circuit of a fire-proof and smoke-proof motor with a bridge stack according to an embodiment of the present invention.

1. Controller; 2. Dual relay; 3. Motor coil; 4. Bridge stack; 5. Capacitor; 6. MOS tube; 7. First resistor; 8. Second resistor; 9. Diode.

Embodiments of the present invention

In order to further illustrate the technical solution of the present invention in detail, the present invention will be further clarified below in conjunction with specific embodiments.

As shown in Fig. 1 is the gravity sliding control circuit of a fire-proof and smoke-proof motor of the present invention, which includes a controller, a dual-circuit relay, a motor coil, a bridge stack, a capacitor, and a MOS tube. The normally open contacts of the dual-circuit relay are connected to the The No. 1 port of the controller and the No. 2 port of the motor coil, and the normally closed contacts of the dual-circuit relay are connected to the positive pole of the bridge stack and the drain of the MOS tube, and the capacitor is connected in parallel to the bridge stack.

In the present invention, the drain and gate of the MOS tube are connected to the first resistor for bleeding current, the gate of the MOS tube is grounded through the second resistor, and the positive pole of the capacitor is in contact with the positive pole of the bridge stack and the normally closed contact of the dual-circuit relay. Point is connected, the negative pole of the capacitor is connected with the negative pole of the bridge stack.

It is understandable that when the external power supply is normal, the normally open contacts of the dual-circuit relay are closed. Since the normally open contacts of the dual-circuit relay are connected to the controller's port 1 and the motor coil's port 2, the motor can be controlled in the power supply. It works normally under the action to realize the up and down of the smoke blocking wall. When a fire occurs and the external connection line of the motor is disconnected or short-circuited, the normally closed contact of the dual-circuit relay is closed, and the normally closed contact of the dual-circuit relay is connected to the positive pole of the bridge stack and the drain of the MOS tube. The capacitor is connected in parallel to the bridge stack. When the external connection line is disconnected, the circuit at both ends of the MOS tube is connected, the motor starts to slide down with gravity, the motor generates electricity, and the motor coil discharges and is absorbed and stored by the capacitor. When the voltage rises to the conduction voltage of the MOS tube, the MOS tube The tube is turned on, the voltage at both ends of the coil decreases, and the motor speed slows down to ensure that the falling speed of the vertical wall is within the controllable range.

It should be noted that the connection of the four diodes 9 in the bridge stack is shown in Figure 2. The output end of the diode 9 is connected to the anode of the capacitor, the input end of the diode 9 is connected to the cathode of the capacitor, and the port 1 of the motor coil is connected to the bridge. The stack is connected to node a, and the No. 2 port of the motor coil and the bridge stack are connected to node b. The positions of node a and node b can be exchanged without affecting the role of the bridge stack in the circuit.

The first resistance is preferably a 10R resistance, and the second resistance is preferably a 10K resistance.

The capacitor 5 is an electrolytic capacitor, and the negative electrode of the capacitor 5 is grounded. The electrolytic capacitor has a large capacity, a high rated voltage, a large operating temperature range, and a low cost.

The MOS tube is preferably an N-channel MOS tube.

Claims

A gravity sliding control circuit for a fire-proof smoke shielding motor, which is characterized by comprising a motor controller (1), a dual relay (2), a motor coil (3), a bridge stack (4), a capacitor (5) and a MOS tube ( 6) The normally open contact of the dual-circuit relay (2) is connected to the No. 1 port of the controller (1) and the No. 2 port of the motor coil (3), and the dual-circuit relay (2) A normally closed contact connects the anode of the bridge stack (4) and the drain of the MOS transistor (6), and the capacitor (5) is connected in parallel to the bridge stack (4).
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, characterized in that: the drain and the gate of the MOS tube (6) are connected to a first resistor (7) for current leakage.
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, wherein the capacitor (5) is an electrolytic capacitor.
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, wherein the grid of the MOS tube (6) is grounded through a second resistor (8).
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, characterized in that: the positive pole of the capacitor (5) and the positive pole of the bridge stack (4) and the normally closed of the dual-circuit relay (2) The contact points are connected.
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, wherein the negative pole of the capacitor (5) is connected to the negative pole of the bridge stack (4).
The gravity sliding control circuit of a fire-proof and smoke-proof motor according to claim 1, wherein the MOS tube (6) is an N-channel MOS tube.