CN115416836A - Ventilation system for ship engine room - Google Patents
Ventilation system for ship engine room Download PDFInfo
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- CN115416836A CN115416836A CN202211175472.1A CN202211175472A CN115416836A CN 115416836 A CN115416836 A CN 115416836A CN 202211175472 A CN202211175472 A CN 202211175472A CN 115416836 A CN115416836 A CN 115416836A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 67
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 230000002441 reversible effect Effects 0.000 claims description 26
- 238000004804 winding Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 4
- 206010010904 Convulsion Diseases 0.000 claims 3
- 230000036461 convulsion Effects 0.000 claims 3
- 238000005086 pumping Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/06—Ventilation; Air-conditioning of engine rooms
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a ship cabin ventilation system which comprises a fan, a frequency converter, a main loop, a bypass switch and a control module, wherein the fan is arranged on the main loop; the frequency converter runs in the main loop, and the number of the fans and the frequency converter is multiple and the fans and the frequency converter are connected in a one-to-one correspondence manner; the bypass switch is used for controlling the fan to operate in the bypass loop so as to enable the fan to enter a bypass mode; the control module is electrically connected with the frequency converter and the bypass switch, and is used for acquiring an automatic frequency conversion mode setting instruction and controlling the frequency converters to drive the fans to operate in sequence based on the automatic frequency conversion mode setting instruction. By adopting the scheme, the energy-saving and reliable effect of the ship cabin ventilation system is realized.
Description
Technical Field
The invention relates to the technical field of ventilation system control, in particular to a ship cabin ventilation system.
Background
For a ship, a set of cabin ventilation system is usually arranged, a ventilator and an exhaust fan or a reversible fan are generally arranged, and the requirements on the intellectualization and the energy conservation of the ship market are gradually improved recently, so that the application of frequency conversion control is relatively wide. For a cabin ventilation system without a frequency converter, the fan is in a full-load working state for a long time, the service life of the fan is influenced, and energy is not saved. For the ventilation system with the frequency converter for adjusting the air volume in real time, the frequency converter is frequently used and is easy to break down, and the insecurity of the system is increased. And for the ship power grid with smaller power grid capacity, the cabin ventilation of the ship can be influenced after the frequency converter fails.
Disclosure of Invention
The invention provides a ship cabin ventilation system, which aims to solve the problems that the service life of the existing cabin ventilation system without frequency conversion control is influenced and energy is not saved due to long-term full-load work of a fan, but the frequency converter of the existing cabin ventilation system with frequency conversion control is frequently used and easily breaks down, the system insecurity is increased, and the cabin ventilation of a ship is influenced after the frequency converter breaks down.
According to an aspect of the present invention, there is provided a ship cabin ventilation system including a fan, a frequency converter, a main loop, a bypass switch, and a control module;
the frequency converter runs in the main loop, and the number of the fans and the frequency converter is multiple and the fans and the frequency converter are connected in a one-to-one correspondence manner;
the bypass switch is used for controlling the fan to operate in the bypass loop so as to enable the fan to enter a bypass mode;
the control module is electrically connected with the frequency converter and the bypass switch, and is used for acquiring an automatic frequency conversion mode setting instruction and controlling the frequency converters to drive the fans to operate in sequence based on the automatic frequency conversion mode setting instruction.
In an optional embodiment of the present invention, the control module is specifically configured to release the automatic frequency conversion mode of the remaining fans when a preset number of the fans operate in the bypass mode.
In an alternative embodiment of the invention, the plurality of fans includes at least one reversible fan and at least one blower;
the control module is used for acquiring a pumping and air supply switching instruction, when the air supply of the reversible fan is controlled based on the pumping and air supply switching instruction, the reversible fan stops air supply, the reversible fan starts air suction after preset time, and when the air suction of the reversible fan is controlled based on the pumping and air supply switching instruction, the reversible fan stops air suction and starts air supply after preset time.
In an optional embodiment of the invention, the ship cabin ventilation system further comprises a temperature detection part for detecting the cabin temperature;
the temperature detection piece is electrically connected with the control module, the control module is used for determining whether the cabin temperature is in a preset temperature range, when the cabin temperature is not in the preset temperature range, a first PID feedback value is determined through PID operation based on the cabin temperature and the preset temperature range, and the frequency converter is controlled to adjust the speed of the fan based on the first PID feedback value until the cabin temperature is in the preset temperature range.
In an optional embodiment of the invention, the ship cabin ventilation system further comprises a pressure difference detection part for detecting a cabin pressure difference;
the pressure difference detection piece is electrically connected with the control module, the control module is used for determining whether the cabin pressure difference is in a preset pressure difference range when the cabin temperature is in the preset temperature range, determining a second PID feedback value through PID operation based on the cabin pressure difference and the preset pressure difference range when the cabin pressure difference is not in the preset pressure difference range, and controlling the frequency converter to adjust the speed of the fan based on the second PID feedback value until the cabin pressure difference is in the preset pressure difference range.
In an optional embodiment of the invention, the marine cabin ventilation system further comprises an autotransformer for controlling at least one of the fans to start dropping to operate in the bypass loop.
In an optional embodiment of the invention, the fans comprise stator windings, and the stator windings of at least one fan are connected into a triangle for starting through star-triangle voltage reduction to operate in the bypass loop.
In an optional embodiment of the invention, the marine engine room ventilation system further comprises start-stop switches, the number of the start-stop switches is the same as that of the fans, the start-stop switches are connected in a one-to-one correspondence manner, and the start-stop switches are used for controlling the start and stop of the fans.
In an optional embodiment of the invention, the marine engine room ventilation system further comprises a switching module, wherein the switching module is used for switching the automatic frequency conversion mode and the manual frequency conversion mode;
the start-stop switch is electrically connected with the switching module and is used for controlling the start and stop of the fan in the manual frequency conversion mode.
In an optional embodiment of the present invention, the ship cabin ventilation system further includes an input module, the input module is configured to receive an operating frequency given signal, the control module is electrically connected to both the input module and the switching module, and the control module is configured to adjust the frequency of the fan through the frequency converter based on the operating frequency given signal in a manual frequency conversion mode.
According to the technical scheme of the embodiment of the invention, the frequency converter runs in the main loop, and the number of the fans and the frequency converter is multiple and the fans and the frequency converter are connected in a one-to-one correspondence manner; the bypass switch is used for controlling the fan to operate in the bypass loop so as to enable the fan to enter a bypass mode; because the converter operates at the major loop, this ventilation system still has the bypass return circuit simultaneously, so when in actual use, can control the fan according to the demand and operate at bypass return circuit or major loop, when operating at the major loop, because converter and fan electricity are connected, can adjust the speed of fan through the converter, so the fan can not lead to long-term full load work that life is influential and not energy-conserving. Meanwhile, when the fan runs in the bypass loop, the frequency converter cannot be used, the use frequency of the frequency converter is reduced, and the problems that the frequency converter of the conventional cabin ventilation system with frequency conversion control is frequently used and is prone to failure and the unsafety of the system is increased are solved. In addition, the bypass loop and the main loop are different loops, so the frequency converter and the bypass loop have an interlocking function, the fan can still run on the bypass loop after the frequency converter fails, the cabin ventilation of the ship is not affected, and the problem that the cabin ventilation of the ship is affected after the frequency converter fails is solved. The ship cabin ventilation system has the advantages of energy conservation and reliability.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit block diagram of a cabin ventilation system of a ship according to an embodiment of the present invention;
FIG. 2 is a block diagram of an electrical circuit of another vessel cabin ventilation system provided by an embodiment of the invention;
fig. 3 is a block circuit diagram of another ship cabin ventilation system according to an embodiment of the present invention.
Wherein: 1. a fan; 2. a frequency converter; 5. a bypass switch; 6. a control module; 7. a temperature detection member; 8. a differential pressure detecting member; 9. an auto-transformer; 10. and (5) starting and stopping a switch.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a circuit block diagram of a cabin ventilation system of a ship, which is applicable to a cabin ventilation situation of a ship according to an embodiment of the present invention, and as shown in fig. 1, the cabin ventilation system of a ship includes a fan 1, a frequency converter 2, a main loop, a bypass switch 5, and a control module 6.
The frequency converter 2 runs in a main loop, and the number of the fans 1 and the frequency converter 2 is multiple and the fans and the frequency converter are connected in a one-to-one correspondence manner; the main circuit is a circuit mainly operated by the system, and the Variable-frequency Drive (VFD) is an electric control device which controls the alternating-current motor by applying a frequency conversion technology and a microelectronic technology and changing a working power supply frequency mode of the motor. The fan 1 is a machine that increases the pressure of gas and discharges the gas by means of input mechanical energy, and is a driven fluid machine. The fan 1 can supply air or exhaust air according to different types, or can exhaust air and supply air. The frequency converter 2 is able to change the frequency of the input fan 1 and finally the speed of the fan 1. The ventilation system may also comprise a power supply for supplying power to the equipment and lines involved in the cabin ventilation system of the vessel, such as the main circuit, the bypass circuit, the fan 1, the frequency converter 2, the bypass switch 5, the control module 6, etc.
The bypass switch 5 is used for controlling the fan 1 to operate in a bypass loop so as to enable the fan 1 to enter a bypass mode; the bypass switch 5 is a switch for controlling the fan 1 to operate in the bypass circuit or not, and may be a button switch, a remote control switch, or the like, which is not limited herein. The bypass mode refers to a mode in which the fan 1 is operated in the bypass circuit.
The control module 6 is electrically connected with the frequency converters 2 and the bypass switch 5, and the control module 6 is used for acquiring an automatic frequency conversion mode setting instruction and controlling the frequency converters 2 to drive the fans 1 to operate in sequence based on the automatic frequency conversion mode setting instruction. The automatic frequency conversion mode setting instruction is an instruction for indicating to enter an automatic frequency conversion mode, the ship cabin ventilation system can automatically enter the automatic frequency conversion mode when the ship is started, and can also enter the automatic frequency conversion mode when a user sends the automatic frequency conversion mode setting instruction according to the requirements of the user, for example, a button box or a remote control panel related to the automatic frequency conversion mode setting exists in the ship, when the user operates the button box or the remote control panel, the automatic frequency conversion mode setting instruction can be generated, and then the ship enters the automatic frequency conversion mode.
The control module 6 is a module for performing control, the control module 6 can be used for local control and also can be used for remote control, for example, the control module 6 can perform remote communication, the ship cabin ventilation system further comprises a centralized control platform, and a touch screen is arranged on the centralized control platform, so that remote control can be performed through the touch screen. When local control is performed, the form of the control module 6 may be a control box or a button box, and the inside may be composed of a PLC or a single chip microcomputer, which is not specifically limited herein. In a specific embodiment, the marine vessel cabin ventilation system further comprises a local remote-control changeover switch by which the local control and the remote control are switched.
Under the automatic frequency conversion mode, a plurality of fans 1 of a plurality of 2 drive of converter start in proper order, and the quantity of fan 1 can be set for according to the actual conditions of boats and ships electric wire netting, and in a concrete embodiment, fan 1 has five, for example can number fan 1, the serial number of serial number can be 1 No. fan 1, no. 2 fan 1, no. 3 fan 1, no. 4 fan 1, no. 5 fan 1 etc. when 1 fan 1 starts the back, no. 2 fan 1 restarts, then No. 3 fan 1 starts, analogizes to this, until all fans 1 start. When the fan 1 has a fault, the control module 6 can receive a fault signal sent by the fan 1, and then directly controls the next fan 1 to start.
According to the scheme, the frequency converter 2 operates in the main loop, and the number of the fans 1 and the number of the frequency converters 2 are multiple and are connected in a one-to-one correspondence manner; the bypass switch 5 is used for controlling the fan 1 to operate in a bypass loop so as to enable the fan 1 to enter a bypass mode; because frequency converter 2 operates in the major loop, this ventilation system still has the bypass return circuit simultaneously, so when in actual use, can control fan 1 according to the demand and operate in bypass return circuit or major loop, when operating in the major loop, because frequency converter 2 and fan 1 electricity are connected, can adjust the speed of fan 1 through frequency converter 2, so fan 1 can not lead to long-term full load work that life is influential and not energy-conserving. Meanwhile, when the fan 1 runs in a bypass loop, the frequency converter 2 cannot be used, the use frequency of the frequency converter 2 is reduced, and the problems that the frequency converter 2 of the existing cabin ventilation system with frequency conversion control frequently fails and the system insecurity is increased are solved. In addition, the bypass loop and the main loop are different loops, so the frequency converter 2 and the bypass loop have an interlocking function, the fan 1 can still run on the bypass loop after the frequency converter 2 fails, the cabin ventilation of the ship is not influenced, and the problem that the cabin ventilation of the ship is influenced after the frequency converter 2 fails is solved. The ship cabin ventilation system has the advantages of energy conservation and reliability.
In an optional embodiment of the present invention, the control module 6 is specifically configured to release the automatic frequency conversion mode of the remaining fans 1 when a preset number of fans 1 operate in the bypass mode. Wherein, the other fans 1 are fans 1 operating in the automatic frequency conversion mode except for the bypass mode. When the fans 1 with the preset number operate in the bypass mode, it is indicated that a fault may exist at a certain position of the ventilation system, that is, a fault may occur in a certain frequency converter 2, and at this time, the automatic frequency conversion modes of the other fans 1 are firstly released, so that the other fans 1 stop operating, and the fault is prevented from being enlarged. In a specific embodiment, the preset number is two, that is, when two or more fans 1 are in the bypass mode, the other fans 1 are released from the automatic frequency conversion mode.
In an alternative embodiment of the invention, the plurality of fans 1 comprises at least one reversible fan 1 and at least one blower 1; the reversible fan 1 is a reversible and bidirectional ventilating fan 1, that is, a fan 1 capable of exhausting air and blowing air, and the blower 1 is a fan 1 for blowing air. In a specific embodiment, there are two reversible fans 1 and three blowers 1.
The control module 6 is used for acquiring an air pumping and supplying switching instruction, controlling the reversible fan 1 to stop supplying air based on the air pumping and supplying switching instruction when the reversible fan 1 supplies air, controlling the reversible fan 1 to start air pumping after preset time, controlling the reversible fan 1 to stop air pumping based on the air pumping and supplying switching instruction when the reversible fan 1 pumps air, and controlling the reversible fan 1 to start supplying air after preset time. The ventilation switching instruction indicates that the reversible fan 1 is switched from the ventilation state to the ventilation state and from the ventilation state to the ventilation state. When the fan 1 rotates, the blades continue to rotate for a certain period of time due to inertia even if a signal to stop rotating is received. When the states of air suction and air supply of the reversible fan 1 need to be switched, the preset time is delayed, so that the fan 1 can be prevented from being damaged due to inertia, and the service life of the fan 1 is prolonged. The preset time can be set according to the requirements of the user, and in a specific embodiment, the preset time is three minutes.
In an alternative embodiment of the present invention, as shown in fig. 2, the ship cabin ventilation system further includes a temperature detecting member 7, and the temperature detecting member 7 is used for detecting the cabin temperature. The temperature detecting element 7 is a component capable of detecting temperature, and in a specific embodiment, the temperature detecting element 7 is a temperature sensor, and the temperature detecting element 7 can be disposed in the cabin, so that the cabin temperature can be detected.
The temperature detection part 7 is electrically connected with the control module 6, the control module 6 is used for determining whether the cabin temperature is in a preset temperature range, when the cabin temperature is not in the preset temperature range, a first PID feedback value is determined through PID operation based on the cabin temperature and the preset temperature range, and the frequency converter 2 is controlled to adjust the speed of the fan 1 based on the first PID feedback value until the cabin temperature is in the preset temperature range. The preset temperature range refers to a range in which a preset cabin temperature should be in advance, when the cabin temperature is not in the preset temperature range, for example, when the cabin temperature is higher than the preset temperature range, it is indicated that wind power of the fan 1 is insufficient at this moment, so that the temperature in the cabin is too high, the fan 1 needs to be accelerated, at this moment, a first PID feedback value is determined through PID operation according to the cabin temperature and the preset temperature range, then the frequency converter 2 is controlled based on the first PID feedback value, and the speed of the fan 1 can be changed due to the change of the frequency output by the frequency converter 2, so that the fan 1 is accelerated. When the cabin temperature is lower than the preset temperature range, it is indicated that the wind power of the fan 1 is too large, and the temperature in the cabin is too low, so the fan 1 needs to be decelerated, at this time, a first PID feedback value is determined through PID operation according to the cabin temperature and the preset temperature range, then the frequency converter 2 is controlled based on the first PID feedback value, and the speed of the fan 1 is changed due to the change of the frequency output by the frequency converter 2, so that the fan 1 is decelerated. Through the mode, the temperature in the cabin can be kept within the preset temperature range, and the stable operation of equipment in the cabin is facilitated.
In an alternative embodiment of the present invention, the ship cabin ventilation system further comprises a differential pressure detecting member 8, the differential pressure detecting member 8 is used for detecting a cabin differential pressure; the pressure difference detecting member 8 is a component capable of detecting a pressure difference, and in a specific embodiment, the pressure difference detecting member 8 is a pressure difference sensor, and the pressure difference sensor is disposed in the nacelle so as to detect a pressure difference of the nacelle.
The pressure difference detection piece 8 is electrically connected with the control module 6, the control module 6 is used for determining whether the cabin pressure difference is in a preset pressure difference range when the cabin temperature is in a preset temperature range, when the cabin pressure difference is not in the preset pressure difference range, a second PID feedback value is determined through PID operation based on the cabin pressure difference and the preset pressure difference range, and the frequency converter 2 is controlled to adjust the speed of the fan 1 based on the second PID feedback value until the cabin pressure difference is in the preset pressure difference range.
The preset pressure difference range refers to a range in which a preset cabin pressure difference is supposed to be located in advance, when the cabin pressure difference is not in the preset pressure difference range, for example, when the cabin pressure difference is higher than the preset pressure difference range, it is indicated that the wind power of the fan 1 is too large at this moment, the fan 1 needs to be decelerated, at this moment, a second PID feedback value is determined through PID calculation according to the cabin pressure difference and the preset pressure difference range, then the frequency converter 2 is controlled based on the second PID feedback value, and the speed of the fan 1 is changed due to the change of the frequency output by the frequency converter 2, so that the fan 1 is decelerated. When the cabin pressure difference is lower than the preset pressure difference range, the wind force of the fan 1 is too small, so that the fan 1 needs to be accelerated, at the moment, a second PID feedback value is determined through PID operation according to the cabin pressure difference and the preset pressure difference range, then the frequency converter 2 is controlled based on the second PID feedback value, and the speed of the fan 1 is changed due to the change of the frequency output by the frequency converter 2, so that the fan 1 is accelerated. Through the mode, the pressure difference in the engine room can be kept in the preset pressure difference range, and the comfort degree of people in the engine room is high. In addition, the comfort level of the user can be ensured on the premise of ensuring the stability of the system by firstly ensuring the temperature and then adjusting the pressure difference.
In addition, when the temperature detecting member 7 and the pressure difference detecting member 8 are out of order during signal transmission, the fan 1 may be directly operated at the maximum wind speed.
In an alternative embodiment of the invention, as shown in fig. 3, the marine cabin ventilation system further comprises an autotransformer 9, and the autotransformer 9 is used for controlling the at least one fan 1 to start in a voltage reduction mode so as to operate in a bypass loop. The autotransformer 9 is defined as a special transformer with no need of insulation between the primary and secondary. It is simply referred to that the primary and secondary windings of the transformer are on the same tuning winding, i.e. the transformer has only one winding, i.e. it is a special transformer with a set of windings shared by the output and input. The step-down starting of the autotransformer 9 is realized by reducing the voltage applied to the stator winding of the motor by the autotransformer 9, so as to achieve the purpose of limiting the starting current. When the motor starts, the secondary voltage of the autotransformer 9 is applied to the stator winding. After the starting is finished, the autotransformer 9 is thrown away, the rated voltage is applied to the stator winding, and the motor runs at full voltage. Because the fan 1 is the biggest to the impact of electric wire netting when starting, through making at least one fan 1 start in order to operate in bypass circuit through the mode of self coupling step-down, can reduce the impact to the boats and ships electric wire netting, prevent that the electric wire netting is unstable, do benefit to the stability of boats and ships electric wire netting.
In an alternative embodiment of the invention, the fans 1 comprise stator windings, the stator windings of at least one fan 1 being connected in a delta configuration for starting by means of a star-delta voltage step-down for operating in a bypass circuit. The star-delta starting principle is that the starting current of the motor is in direct proportion to the power supply voltage, at the moment, the starting current provided by the power grid is only 1/3 of the full-voltage starting current, but the starting torque is only 1/3 of the full-voltage starting torque. When the load has no strict requirement on the starting torque of the motor and limits the starting current of the motor, the motor meets the 380V/delta wiring condition, and the star-delta starting method can be adopted only when the stator windings are connected into a triangle during normal running of the motor. The impact of the fan 1 on the power grid is the largest when the fan is started, and the fan 1 is started to run in the bypass loop in a star-delta voltage reduction starting mode, so that the impact on the ship power grid can be reduced, the power grid is prevented from being unstable, and the stability of the ship power grid is facilitated.
In an optional embodiment of the invention, the marine engine room ventilation system further comprises start-stop switches 10, the number of the start-stop switches 10 is the same as that of the fans 1, and the start-stop switches 10 are connected in a one-to-one correspondence manner, and the start-stop switches 10 are used for controlling the start and stop of the fans 1. The start-stop switch 10 is a switch capable of controlling the start and stop of the fan 1, in a specific embodiment, the start-stop switch 10 is a button switch, and a user can manually control the start and the pause of the fan 1 through the start-stop switch 10. For example, when two or more fans 1 are in the bypass mode, the other fans 1 are deactivated from the automatic frequency conversion mode, and when a user needs to restart the fans 1 deactivated from the automatic frequency conversion mode, the fans can be manually started through the start-stop switch 10.
On the basis of the embodiment, the ship cabin ventilation system further comprises a switching module, and the switching module is used for switching an automatic frequency conversion mode and a manual frequency conversion mode.
The start-stop switch 10 is electrically connected with the switching module, and the start-stop switch 10 is used for controlling the start and stop of the fan 1 in a manual frequency conversion mode.
The manual frequency conversion mode means that a user can manually control the starting and stopping of the fan 1 and the frequency, and the automatic frequency conversion mode means that the frequency converter 2 can automatically adjust the frequency of the fan 1 according to the values of the temperature detection piece 7 and the pressure difference detection piece 8. The switching module is a module capable of switching between two modes, for example, a push button switch.
Exemplarily, the marine engine room ventilation system further comprises an input module, the input module is configured to receive the operation frequency given signal, the control module 6 is electrically connected to both the input module and the switching module, and the control module 6 is configured to adjust the frequency of the fan 1 through the frequency converter 2 based on the operation frequency given signal in the manual frequency conversion mode. The input module is a module for receiving instruction information input by a user, and in a specific embodiment, the input module is a remote control HMI panel, and a user can input a frequency to be adjusted by remotely controlling the HMI panel, and then the frequency converter 2 can drive the fan 1 to operate at the frequency.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A ship cabin ventilation system is characterized by comprising a fan (1), a frequency converter (2), a main loop, a bypass switch (5) and a control module (6);
the frequency converter (2) runs in the main loop, and the number of the fans (1) and the frequency converter (2) is multiple and the fans and the frequency converter are connected in a one-to-one correspondence manner;
the bypass switch (5) is used for controlling the fan (1) to operate in the bypass loop so as to enable the fan (1) to enter a bypass mode;
the control module (6) is electrically connected with the frequency converter (2) and the bypass switch (5), and the control module (6) is used for acquiring an automatic frequency conversion mode setting instruction and controlling the frequency converter (2) to drive the fans (1) to operate in sequence based on the automatic frequency conversion mode setting instruction.
2. Marine nacelle ventilation system as claimed in claim 1, wherein said control module (6) is particularly adapted to deactivate said automatic frequency conversion mode of the remaining fans (1) when a preset number of said fans (1) are operating in said bypass mode.
3. The marine cabin ventilation system of claim 1, wherein said plurality of fans (1) comprises at least one reversible fan (1) and at least one blower (1);
control module (6) are used for acquireing and take out the ventilation switching instruction, work as during reversible fan (1) air supply based on take out ventilation switching instruction control reversible fan (1) stops the air supply to control after the time of predetermineeing reversible fan (1) starts convulsions, works as during reversible fan (1) convulsions based on take out ventilation switching instruction control reversible fan (1) stops convulsions, and controls after the time of predetermineeing reversible fan (1) starts the air supply.
4. The marine nacelle ventilation system as claimed in any one of claims 1 to 3, further comprising a temperature detecting member (7), the temperature detecting member (7) being for detecting a nacelle temperature;
the temperature detection piece (7) is electrically connected with the control module (6), the control module (6) is used for determining whether the cabin temperature is in a preset temperature range, when the cabin temperature is not in the preset temperature range, a first PID feedback value is determined through PID operation based on the cabin temperature and the preset temperature range, and the frequency converter (2) is controlled to adjust the speed of the fan (1) based on the first PID feedback value until the cabin temperature is in the preset temperature range.
5. The ship cabin ventilation system according to claim 4, further comprising a differential pressure detecting member (8), wherein the differential pressure detecting member (8) is configured to detect a cabin differential pressure;
the pressure difference detection piece (8) is electrically connected with the control module (6), the control module (6) is used for determining whether the cabin pressure difference is in a preset pressure difference range when the cabin temperature is in the preset temperature range, when the cabin pressure difference is not in the preset pressure difference range, a second PID feedback value is determined through PID operation based on the cabin pressure difference and the preset pressure difference range, and the frequency converter (2) is controlled to adjust the speed of the fan (1) based on the second PID feedback value until the cabin pressure difference is in the preset pressure difference range.
6. Marine cabin ventilation system according to any one of claims 1 to 3, further comprising an autotransformer (9), said autotransformer (9) being adapted to control at least one of said fans (1) to be activated for step-down operation in said bypass loop.
7. Marine engine room ventilation system according to any one of the claims 1-3, characterised in that the fans (1) comprise stator windings, the stator windings of at least one of the fans (1) being connected in a delta for start-up by star-delta voltage reduction for operation in the bypass loop.
8. The marine engine room ventilation system of any one of claims 1 to 3, further comprising start-stop switches (10), wherein the number of the start-stop switches (10) is the same as that of the fans (1), and the start-stop switches (10) are connected in a one-to-one correspondence, and the start-stop switches (10) are used for controlling the start and stop of the fans (1).
9. The marine nacelle ventilation system of claim 8, further comprising a switching module for switching the automatic frequency conversion mode and the manual frequency conversion mode;
the start-stop switch (10) is electrically connected with the switching module, and the start-stop switch (10) is used for controlling the start and stop of the fan (1) in the manual frequency conversion mode.
10. The marine nacelle ventilation system as claimed in claim 9, further comprising an input module for receiving an operating frequency given signal, the control module (6) being electrically connected to both the input module and the switching module, the control module (6) being configured to adjust the frequency of the fan (1) by the frequency converter (2) based on the operating frequency given signal in a manual frequency conversion mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211175472.1A CN115416836A (en) | 2022-09-26 | 2022-09-26 | Ventilation system for ship engine room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211175472.1A CN115416836A (en) | 2022-09-26 | 2022-09-26 | Ventilation system for ship engine room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115416836A true CN115416836A (en) | 2022-12-02 |
Family
ID=84204214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211175472.1A Pending CN115416836A (en) | 2022-09-26 | 2022-09-26 | Ventilation system for ship engine room |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115416836A (en) |
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2022
- 2022-09-26 CN CN202211175472.1A patent/CN115416836A/en active Pending
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