Multi-fan single-air-duct air supply system

Abstract

The invention provides a multi-fan single-air-duct air supply system, and relates to the field of shipbuilding. The power supply is connected in series with the interlocking relay contact and the fan; the start / stop control circuit is that a fan start button, a fan stop button and a fan relay coil are sequentially connected in series, and then two ends are respectively connected with two ends of a transformer; a first contact of the fan relay is connected with a fan starting button in parallel; according to the interlocking control circuit, after a fan relay second contact, an air brake relay contact and an interlocking relay coil are sequentially connected in series, the two ends are connected with the two ends of a transformer respectively. The air brake state feedback circuit is characterized in that two ends of an air brake serially connected with an air brake relay coil are respectively connected with two ends of a transformer; and the air brake circuit comprises an air brake motor, an air brake switch, a third contact of the fan relay and a power supply which are sequentially connected in series. The operation logic of the fan and the air brake is changed, interlocking control is conducted through the fan and the air brake, and the following accidents are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of ships, and particularly relates to a multi-fan single-duct air supply system. Background Art

[0002] Currently, in the fan room of a 1600T wind power installation ship, there are 3 large cabin fans designed. They share the same structural duct to supply air to the cabin. The fans are designed with 2 in use and 1 standby. The fans draw air from the outside through fixed louvers, and an electric fire damper is installed below the fans. The conventional design is as follows: the damper and the fan are set with an interlock function. When the damper is in the closed state, the fan cannot start and run. After the fan stops, the damper remains in the closed state according to the control logic. Manual operation is required to open and close the damper. The above settings pose a risk that the damper may not be closed by personnel. When one of the fans stops, but the damper is not closed, an internal circulation will be formed among the multiple fans, resulting in the inability of the duct to supply air normally and damage to the fans.

[0003] Therefore, how to provide a multi-fan single-duct air supply system has become a technical problem urgently to be solved in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-fan single-duct air supply system.

[0005] The present invention provides a multi-fan single-duct air supply system, which includes: a fan, a transformer, a damper, a power supply, a damper motor, a fan start button, a fan stop button, a damper switch, a fan relay, an interlock relay, and a damper relay;

[0006] The fan relay includes a first contact of the fan relay, a second contact of the fan relay, a third contact of the fan relay, and a fan relay coil;

[0007] The interlock relay includes an interlock relay contact and an interlock relay coil;

[0008] The damper relay includes a damper relay contact and a damper relay coil;

[0009] The power supply is connected to the transformer;

[0010] The power supply is connected in series with the interlock relay contact and the fan in sequence;

[0011] The system further includes: a start / stop control circuit, an interlock control circuit, a damper status feedback circuit, and a damper circuit;

[0012] The start / stop control circuit, the interlock control circuit, and the damper status feedback circuit are three parallel circuits;

[0013] The start / stop control circuit is as follows: The fan start button, the fan stop button, and the fan relay coil are connected in series in sequence, and both ends are respectively connected to both ends of the transformer; The first contact of the fan relay is connected in parallel with the fan start button;

[0014] The interlock control circuit is as follows: The second contact of the fan relay, the brake relay contact, and the interlock relay coil are connected in series in sequence, and both ends are respectively connected to both ends of the transformer;

[0015] The brake status feedback circuit is as follows: The brake and the brake relay coil are connected in series, and both ends are respectively connected to both ends of the transformer;

[0016] The brake circuit is as follows: The brake motor, the brake switch, the third contact of the fan relay, and the power supply are connected in series in sequence.

[0017] Optionally, the first contact of the fan relay, the second contact of the fan relay, and the third contact of the fan relay are all in the normally open state.

[0018] Optionally, the fan button is in the normally open state, and the fan stop button is in the normally closed state.

[0019] Optionally, the brake relay contact is in the normally open state.

[0020] Optionally, the interlock relay contact is in the normally open state.

[0021] Optionally, the brake is in the normally open state.

[0022] Optionally, the brake switch is in the normally closed state.

[0023] Optionally, the fan start method includes:

[0024] Press the fan start button, then the fan relay coil is energized, and at this time

[0025] 1) The first contact of the fan relay closes and forms an interlock with the fan start button;

[0026] 2) The third contact of the fan relay closes, the brake circuit is energized, the brake motor starts, the brake opens, at this time the brake status feedback circuit is energized, the brake relay coil is energized, and the brake relay contact closes;

[0027] 3) The second contact of the fan relay closes, and at the same time the brake relay contact closes, at this time the interlock control circuit is energized;

[0028] 4) At this time, the interlock relay coil is energized, the interlock relay contact closes, and then the fan is powered on and runs.

[0029] Optionally, the fan stop method includes:

[0030] Press the fan stop button, the start / stop control circuit is powered off, the fan relay coil loses power, then the first contact, the second contact and the third contact of the fan relay are all disconnected, the brake circuit is open, the brake motor stops rotating, and the brake closes; at this time, the four circuits of the start / stop control circuit, the interlock control circuit, the brake status feedback circuit and the brake circuit are all in an open state.

[0031] Optionally, the system further includes a busbar, and the transformer is connected to the power supply through the busbar.

[0032] The beneficial effects brought by the present invention are as follows:

[0033] As can be seen from the above solution, the embodiment of the present invention provides a multi-fan single-duct air supply system, which has the following beneficial effects:

[0034] Through the design of the circuit in this application, especially by adding control logic: when the fan is turned on, the fan can start running only after the brake is opened, and the brake closes synchronously after the fan stops, avoiding the formation of an internal circulation between multiple fans, resulting in abnormal air supply in the duct and damage to the fan. This application changes the operation logic of the fan and the brake, and performs interlock control through the fan and the brake, avoiding the occurrence of the following accidents: when a fan stops, but the brake is not closed, an internal circulation will be formed between multiple fans, resulting in abnormal air supply in the duct and damage to the fan. Description of the Drawings

[0035] Figure 1 It is a schematic diagram of the fan circuit of a multi-fan single-duct air supply system provided according to an embodiment;

[0036] Figure 2 It is a schematic diagram of the brake circuit of a multi-fan single-duct air supply system provided according to an embodiment.

[0037] Description of the Reference Numerals:

[0038] 1 - Fan relay,

[0039] 11 - The first contact of the fan relay, 12 - The second contact of the fan relay, 13 - The third contact of the fan relay, 14 - The coil of the fan relay,

[0040] 2 - Interlock relay,

[0041] 21 - The contact of the interlock relay, 22 - The coil of the interlock relay,

[0042] 3 - Brake relay

[0043] 31 - The contact of the brake relay, 32 - The coil of the brake relay,

[0044] 4 - Fan

[0045] 5 - Brake Motor

[0046] 6 - Power Supply

[0047] 7 - Transformer. Detailed Implementation Manner

[0048] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0049] This application belongs to the technical field of shipbuilding. The ship air supply system is designed with multiple fans that share the same structural air duct for air supply, and one of the fans is a backup for other fans. When other fans fail, the backup fan is started. The fans draw air from the outside through fixed louvers, and an electric fire damper is provided below the fans. The damper and the fans are interlocked. When the fans are turned on, the fans can only start running after the damper is opened, and the control logic that the damper closes after the fans stop.

[0050] As Figure 1 and Figure 2 shown, this embodiment provides a multi - fan single - duct air supply system, and the system includes: fan 4, transformer 7, damper, brake motor 5, power supply, fan start button, fan stop button, damper switch, fan relay 1, interlock relay 2 and damper relay 3;

[0051] The fan relay 1 includes a first fan relay contact 11, a second fan relay contact 12, a third fan relay contact 13 and a fan relay coil 14;

[0052] The interlock relay 2 includes an interlock relay contact 21 and an interlock relay coil 22;

[0053] The damper relay 3 includes a damper relay contact 31 and a damper relay coil 32;

[0054] The power supply is connected to the transformer;

[0055] The power supply is connected in series with the interlock relay contact 21 and the fan 4 in sequence;

[0056] The system further includes: start / stop control circuit, interlock control circuit, damper status feedback circuit and damper circuit;

[0057] The starting / stopping control circuit, the interlock control circuit, and the brake status feedback circuit are three parallel circuits;

[0058] The starting / stopping control circuit is as follows: The fan start button, the fan stop button, and the fan relay coil 14 are connected in series in sequence, and then the two ends are respectively connected to the two ends of the transformer 7; The first contact 11 of the fan relay is connected in parallel with the fan start button;

[0059] The interlock control circuit is as follows: The second contact 12 of the fan relay, the brake relay contact 31, and the interlock relay coil 22 are connected in series in sequence, and then the two ends are respectively connected to the two ends of the transformer 7;

[0060] The brake status feedback circuit is as follows: The brake and the brake relay coil 32 are connected in series, and then the two ends are respectively connected to the two ends of the transformer 7;

[0061] The brake circuit is as follows: The brake motor 5, the brake switch, the third contact 13 of the fan relay, and the power supply 6 are connected in series in sequence.

[0062] Among them, the first contact 11 of the fan relay, the second contact 12 of the fan relay, and the third contact 13 of the fan relay are all in the normally open state; The fan button is in the normally open state, the fan stop button is in the normally closed state; The brake relay contact 31 is in the normally open state; The interlock relay contact 21 is in the normally open state; The brake is in the normally open state; The brake switch is in the normally closed state.

[0063] In addition, the system further includes a busbar, and the transformer is connected to the power supply through the busbar.

[0064] The fan starting method includes:

[0065] Press the fan start button, then the fan relay coil 14 is energized, and at this time

[0066] 1) The first contact 11 of the fan relay closes and forms an interlock with the fan start button. Even if the fan start button is disconnected at this time, the fan starting / stopping control circuit will not be disconnected; For the air supply system with multiple fans and a single air duct, the fan and the brake are interlocked to avoid damage to the fan and the air supply equipment caused by human operation reasons.

[0067] 2) The third contact 13 of the fan relay closes, the brake circuit is energized, the brake motor starts, the brake opens, at this time the brake status feedback circuit is energized, the brake relay coil 32 is energized, and the brake relay contact 31 closes;

[0068] 3) The second contact 12 of the fan relay closes, and at the same time the brake relay contact 31 closes. At this time, the interlock control circuit is energized;

[0069] 4) At this time, the interlock relay coil 22 is energized, the interlock relay contact 21 closes, and then the fan 4 is powered on and runs.

[0070] The fan stop method includes:

[0071] 1) Press the fan stop button, the start / stop control circuit is de-energized, the fan relay coil 14 is de-energized, then the first fan relay contact 11, the second fan relay contact 12, and the third fan relay contact 13 are all opened, the brake circuit is open, the brake motor stops rotating, and the brake closes; at this time, the four circuits of the start / stop control circuit, the interlock control circuit, the brake state feedback circuit, and the brake circuit are all in an open state.

[0072] Working principle:

[0073] As Figure 1 and 2 shown, the fan start logic:

[0074] 1. Press the fan start button, and the relay K533.42 is energized.

[0075] 2. After the relay K533.42 is energized, the auxiliary contact closes and the brake opens

[0076] 3. After the brake is opened in place, the brake limit switch contact closes, and the relay K533.63 is energized.

[0077] 4. When the relay K533.63 is energized, the auxiliary contact closes, and the relay KM533.61 is energized

[0078] 5. When the relay KM533.61 is energized, the main fan contact closes, and the fan starts to run.

[0079] As Figure 1 and 2 shown, the fan stop logic:

[0080] 1. Press the fan stop button, and the relay K533.42 is de-energized.

[0081] 2. After the relay K533.42 is de-energized, the brake closes.

[0082] In this application, when the fan is turned off, the brake is synchronously closed to avoid internal circulation and ensure that the air duct can always operate normally. By adding circuit control logic: when the fan is turned on, the fan can only start running after the brake is opened, and the brake is synchronously closed after the fan stops. To ensure the normal air supply of multiple fans in a single air duct.

[0083] In summary, through the circuit design of this application, especially by adding control logic: when the fan is turned on, it can only start running after the air damper is opened, and the air damper closes synchronously after the fan stops, avoiding the formation of an internal circulation among multiple fans, which may lead to abnormal air supply in the air duct and damage to the fan. This application changes the operating logic of the fan and the air damper, and conducts interlocking control through the fan and the air damper to avoid the occurrence of the following accidents: when a fan stops running but the air damper is not closed, an internal circulation may be formed among multiple fans, resulting in abnormal air supply in the air duct and damage to the fan.

[0084] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A multi-fan single duct air supply system, characterized in that: The system includes: a fan, a transformer, a power supply, a damper, a damper motor, a fan start button, a fan stop button, a damper switch, a fan relay, an interlock relay and a damper relay; The fan relay comprises a first contact of the fan relay, a second contact of the fan relay, a third contact of the fan relay and a fan relay coil; The interlock relay comprises an interlock relay contact and an interlock relay coil; The wind brake relay comprises a wind brake relay contact and a wind brake relay coil; The power supply is connected to the transformer; The power supply is connected in series with the interlock relay contacts and the fan in sequence; The system also includes: a start / stop control circuit, an interlock control circuit, a damper state feedback circuit and a damper circuit; The start / stop control circuit, interlock control circuit and damper status feedback circuit are three parallel circuits; The start / stop control circuit is as follows: the fan start button, the fan stop button and the fan relay coil are connected in series in sequence, and the two ends are connected to the two ends of the transformer respectively; the first contact of the fan relay is connected in parallel with the fan start button; The interlocking control circuit is: the second contact of the fan relay, the contact of the wind brake relay and the interlocking relay coil are connected in series in sequence, and the two ends are connected to the two ends of the transformer respectively; The wind gate state feedback circuit is: the two ends of the wind gate and the wind gate relay coil connected in series are respectively connected to the two ends of the transformer; The wind brake circuit is: the wind brake motor, the wind brake switch, the third contact of the fan relay and the power supply are connected in series in sequence.

2. The multi-fan single-duct air supply system according to claim 1, characterized in that: The first contact of the fan relay, the second contact of the fan relay, and the third contact of the fan relay are all in a normally open state.

3. The multi-fan single-duct air supply system according to claim 2, characterized in that: The fan button is in a normally open state, and the fan stop button is in a normally closed state.

4. The multi-fan single-duct air supply system according to claim 3, characterized in that: The damper relay contact is in a normally open state.

5. The multi-fan single-duct air supply system according to claim 4, characterized in that: The interlock relay contacts are normally open.

6. The multi-fan single-duct air supply system according to claim 5, characterized in that: The wind damper is in a normally open state.

7. The multi-fan single-duct air supply system according to claim 6, characterized in that: The wind gate switch is in a normally closed state.

8. The multi-fan single-duct air supply system according to claim 7, characterized in that: The fan starting method comprises: Press the fan start button, and the fan relay coil is energized. 1) The first contact of the fan relay is closed and interlocked with the fan start button; 2) The third contact of the fan relay is closed, the wind brake circuit is open, the wind brake motor is started, and the wind brake is opened. At this time, the wind brake state feedback circuit is open, the wind brake relay coil is energized, and the wind brake relay contact is closed; 3) The second contact of the fan relay is closed, and at the same time, the contact of the wind brake relay is closed, and the interlock control circuit is open; 4) At this time, the interlock relay coil is energized, the interlock relay contacts are closed, and then the fan is powered on and runs.

9. The multi-fan single-duct air supply system according to claim 8, characterized in that: The fan stopping method comprises: When the fan stop button is pressed, the start / stop control circuit is powered off, the fan relay coil is de-energized, the first contact of the fan relay, the second contact of the fan relay and the third contact of the fan relay are all disconnected, the wind brake circuit is open, the wind brake motor stops rotating, and the wind brake is closed; at this time, the start / stop control circuit, the interlocking control circuit, the wind brake status feedback circuit and the wind brake circuit are all in an open circuit state.

10. The multi-fan single-duct air supply system according to claim 1, characterized in that: The system further comprises a bus bar, and the transformer is connected to a power source via the bus bar.

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