Diesel engine starting device and diesel generator set

Abstract

The utility model provides a diesel engine starting device and a diesel generating set, the diesel engine starting device is provided with an electric starting motor and a gas starting motor which are in transmission connection with a diesel engine main shaft, and a starting control module which comprises a starting control unit and a starting driving unit, the starting driving unit is provided with two starting paths which are respectively used for starting power supply control of the electric starting motor and starting air supply control of the air starting motor; the conduction of the two starting paths is respectively controlled by the starting control unit, and a logic controller arranged on the starting control unit can synchronously open an oil valve of the diesel engine during electric starting and gas starting, so that the oil supply of the diesel engine is guaranteed, and the starting reliability is guaranteed. According to the diesel engine starting device and the diesel generating set, the electric starting redundant starting motor and the gas starting redundant starting motor are arranged, when starting driving force of one redundant starting motor is insufficient, the other redundant starting motor can be selected, when any one redundant starting motor is started, the diesel engine oil valve can be opened synchronously, and starting reliability of the diesel generating set can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel generators, in particular to a diesel engine starting device and a diesel generator set. Background Art

[0002] To ensure effective starting, the internal combustion engine needs to be externally driven to increase the speed before ignition to avoid vibration. The diesel engine has a simple structure, long service life, high economy and strong reliability, so diesel generator sets are often used for emergency power supply.

[0003] At present, diesel generator sets generally use electric motors to start diesel generator sets, but the starting of the electric motor itself requires a large starting current. When the configured battery power consumption is large or the battery is powered up due to long-term use, the diesel generator set will not be able to start normally.

[0004] Diesel generator sets are often used as backup power sources in rescue scenarios, hospitals, data centers and other places. If the starting motor fails during the starting process, it will affect the normal power supply of the diesel generator set and cause great economic losses. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a diesel engine starting device and a diesel generator set to solve the problem of insufficient starting reliability of the diesel generator set in the prior art.

[0006] The utility model provides a diesel engine starting device, comprising: an electric starting motor and an air starting motor connected to the main shaft of the diesel engine, and a starting control module, wherein the starting control module comprises a starting control unit and a starting drive unit, wherein:

[0007] The starting drive unit comprises an electric starting path and an air starting path connected from the positive end to the negative end of the driving power supply, the electric starting path comprises a first switch and a coil of a first electric starting contactor connected in series in a forward direction, the normally open contact of the first electric starting contactor is connected in series between the electric starting motor and the driving power supply, the air starting path comprises a second switch and an electromagnetic valve connected in series in a forward direction, and the electromagnetic valve is connected in series on the air supply pipeline of the air starting motor;

[0008] The starting control unit includes a logic controller, and the first output terminal, the second output terminal and the third output terminal of the logic controller are respectively connected to the negative power terminal of the logic controller through the coils of the first relay, the second relay and the third relay, and the first output terminal and the second output terminal are respectively connected to the positive power terminal of the logic controller through the electric start logic switch and the gas start logic switch, the first switch and the second switch are the normally open contacts of the first relay and the second relay respectively, and the normally open contact of the third relay is also connected in series to the diesel engine oil valve driving path, and the third output terminal of the logic controller is also connected to the positive power terminal of the logic controller when the electric start logic switch or the gas start logic switch is triggered.

[0009] Optionally, the startup control module further includes a mode selection unit, wherein:

[0010] The mode selection unit includes an electric start mode selection path and a gas start mode selection path connected in parallel between the positive end of the power supply and the negative end of the power supply of the mode selection unit, the electric start mode selection path includes an electric start mode selection switch and a coil of a fourth relay, and the gas start mode selection path includes a gas start mode selection switch and a coil of a fifth relay;

[0011] The normally open contact of the fourth relay and the normally closed contact of the fifth relay are connected in series in the electric start path and are located at the input side of the first switch;

[0012] The normally closed contact of the fourth relay and the normally open contact of the fifth relay are connected in series in the gas starting path and are located on the input side of the second switch.

[0013] Optionally, the startup control module further includes a mode selection unit, wherein:

[0014] The mode selection unit includes an electric start mode selection path and a gas start mode selection path connected in parallel between the positive end of the power supply and the negative end of the power supply of the mode selection unit, the electric start mode selection path includes an electric start mode selection switch and a coil of a fourth relay, and the gas start mode selection path includes a gas start mode selection switch and a coil of a fifth relay;

[0015] The fourth relay and the fifth relay both include a secondary normally open contact, and the secondary normally open contact of the fourth relay is connected in series between the negative end of the gas-started logic switch and the negative end of the power supply of the logic controller, and the secondary normally open contact of the fifth relay is connected in series between the negative end of the electric-started logic switch and the negative end of the power supply of the logic controller.

[0016] Optionally, the mode selection unit also includes an automatic mode selection path, which includes an automatic start mode switch and a coil of a sixth relay connected in series between the positive end of the power supply to the negative end of the power supply of the mode selection unit, and two sets of normally open contacts of the sixth relay are respectively connected in parallel with the series structure of the normally open contacts of the fourth relay and the normally closed contacts of the fifth relay, and the series structure of the normally closed contacts of the fourth relay and the normally open contacts of the fifth relay.

[0017] Optionally, the positive ends of the electric starting path and the gas starting path are connected in parallel and are connected to the positive end of the driving power supply through a main starting control switch.

[0018] Optionally, the starting drive unit also includes a second electric starting contactor, the normally open contact of the first electric starting contactor and the coil of the second electric starting contactor are connected in series with the driving power supply, and the normally open contact of the second electric starting contactor and the electric starting motor are connected in series with the driving power supply.

[0019] Optionally, a charger is further included, the driving power source includes a battery pack, the charger is connected to the battery pack for charging, and the charger is connected to the diesel engine for transmission.

[0020] Optionally, the driving power source includes a battery pack, and the battery pack is also connected to the mains via a floating charger so as to be charged by connecting to the mains via the floating charger.

[0021] Optionally, a power switch is also connected in series on the negative output path of the driving power supply.

[0022] Another aspect of the utility model provides a diesel generator set, which comprises the above-mentioned diesel engine starting device.

[0023] The diesel engine starting device provided by the utility model comprises an electric starting motor and an air starting motor connected to the diesel engine main shaft transmission, and a starting control module, wherein the starting control module comprises a starting control unit and a starting driving unit, wherein the starting driving unit comprises an electric starting path and an air starting path connected from the positive end to the negative end of the driving power supply, and is respectively used for starting power supply control of the electric starting motor and starting air supply control of the air starting motor; the starting control unit comprises a logic controller, wherein the first output end, the second output end and the third output end of the logic controller are respectively connected to the negative end of the power supply of the logic controller through the coils of the first relay, the second relay and the third relay, the first output end and the second output end are respectively connected to the positive end of the power supply of the logic controller through the electric starting logic switch and the air starting logic switch, the first switch and the second switch are respectively the normally open contacts of the first relay and the second relay, and the starting control of the electric starting motor and the air starting motor can be isolated and controlled by the electric starting logic switch and the air starting logic switch, and the normally open contact of the third relay is also connected in series on the diesel engine oil valve driving path, and when the electric starting logic switch or the air starting logic switch is triggered, the diesel engine oil valve can be opened synchronously to ensure the diesel engine oil supply and the reliability of starting.

[0024] The diesel generator set provided by the utility model comprises the above-mentioned diesel engine starting device, which can effectively improve the starting reliability of the diesel generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a starting drive unit of a diesel engine starting device in the utility model;

[0026] Figure 2 It is a schematic diagram of the equivalent structure of the starting control unit of the diesel engine starting device in the utility model;

[0027] Figure 3 It is a structural schematic diagram of the mode selection unit of the diesel engine starting device in the utility model.

[0028] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] In order to solve the problem of insufficient starting reliability of diesel generator sets in the prior art, the utility model provides a diesel engine starting device, which includes an electric starting motor and an air starting motor connected to the main shaft of the diesel engine, and a starting control module, wherein the starting drive unit includes an electric starting path and an air starting path connected to the positive end of the driving power supply, which are respectively used for starting power supply control of the electric starting motor and starting air supply control of the air starting motor; the starting control unit includes a logic controller, the first output end, the second output end and the third output end of the logic controller are respectively connected to the negative end of the power supply of the logic controller through the coils of the first relay, the second relay and the third relay, the first output end and the second output end are respectively connected to the positive end of the power supply of the logic controller through the electric starting logic switch and the air starting logic switch, the first switch and the second switch are respectively the normally open contacts of the first relay and the second relay, the starting control of the electric starting motor and the air starting motor can be isolated and controlled by the electric starting logic switch and the air starting logic switch, and the normally open contact of the third relay is also connected in series on the diesel engine oil valve driving path, when the electric starting logic switch or the air starting logic switch is triggered, the diesel engine oil valve can be opened synchronously to ensure the fuel supply of the diesel engine and the reliability of starting.

[0033] For details, please refer to Figure 1 , Figure 2 and Figure 3 , shown is a schematic diagram of the structure of each part of the diesel engine starting device of this embodiment.

[0034] The starting drive unit includes an electric starting path and an air starting path connected from the positive end to the negative end of the driving power supply BT, which are respectively used for power starting control of the electric starting motor M1 and air supply starting control of the air starting motor M2.

[0035] The electric starting path includes a first switch (KA1-1) and a coil (KM1) of a first electric starting contactor connected in series in a forward direction. The normally open contact (KM1-1) of the first electric starting contactor and the coil (KM2) of the second electric starting contactor are connected in series between the positive end and the negative end of the driving power supply BT. The normally open contact (KM2-1) of the second electric starting contactor is connected in series between the electric starting motor M1 and the driving power supply BT. When the driving power supply BT is connected to the input path of the first switch, as the first switch is turned on, the coil of the first electric starting contactor is energized, and finally the normally open contact of the second electric starting contactor is controlled to close, and the electric starting motor M1 is started by connecting the driving power supply BT.

[0036] In this embodiment, a two-stage starting contactor is provided to improve the isolation effect of electrical control, improve the power stability and safety of the electric starting motor M1, and further improve the reliability of electric starting. In an optional embodiment, the normally open contact of the first electric starting contactor is directly connected in series to the power path of the electric starting motor M1.

[0037] The air start path includes a second switch (KA2-1) and a solenoid valve T1 which are connected in series in a forward direction. The solenoid valve T1 is connected in series to the air supply pipeline of the air start motor M2. When the driving power supply BT is connected to the input path of the second switch, as the second switch is turned on, the solenoid valve T1 is energized, and the air start motor M2 is connected to the air source and started.

[0038] The starting control unit includes a logic controller 20, wherein the first output terminal 21, the second output terminal 22 and the third output terminal 23 of the logic controller 20 are respectively connected to the negative power terminal of the logic controller 20 through the coils of the first relay, the second relay and the third relay (corresponding to KA1, KA2 and KA3 respectively), and the first output terminal 21 and the second output terminal 22 are respectively connected to the positive power terminal of the logic controller 20 through the electric starting logic switch 201 and the gas starting logic switch 202. The first switch and the second switch are the normally open contacts of the first relay and the second relay respectively. When the electric starting logic switch 201 is triggered, the coil of the first relay is energized and the first switch is closed. When the gas starting logic switch 202 is triggered, the coil of the second relay is energized and the second switch is closed.

[0039] The normally open contact (KA3-1) of the third relay is also connected in series on the driving path of the diesel engine oil valve 10. The third output terminal 23 of the logic controller 20 is also connected to the positive power terminal of the logic controller 20 when the electric start logic switch 201 or the gas start logic switch 202 is triggered, so as to synchronously open the diesel engine oil valve T0 during electric start or gas start.

[0040] The logic controller 20 may be a programmable logic controller or other logic controllers in the prior art, and is mainly used to realize the control logic. The specific structure thereof is not described in detail here. For example, the electric start logic switch 201 and the gas start logic switch 202 are each provided with a bypass switch, and the two bypass switches are respectively connected to the third output terminal 23 of the logic controller 20 and the positive terminal of the power supply, or the first output terminal 21 and the second output terminal 22 are used as the control source of the third output terminal 23 by using logic gates such as "XOR" and "NOR".

[0041] In order to improve the unity of starting and avoid the electric starter motor and the gas starter motor being started at the same time, causing waste of resources, in this embodiment, the starting control module also includes a mode selection unit, which is used to lock the starting drive path of another starting mode when selecting a starting mode.

[0042] Specifically, the mode selection unit includes an electric start mode selection path and a gas start mode selection path connected in parallel between the positive end of the power supply to the negative end of the power supply of the mode selection unit, the electric start mode selection path includes an electric start mode selection switch and a coil (KA4) of a fourth relay, the gas start mode selection path includes a gas start mode selection switch and a coil (KA5) of a fifth relay, the electric start mode selection switch and the gas start mode selection switch are provided by two switch control paths in the mode selection switch 30; the normally open contact (KA4-1) of the fourth relay and the normally closed contact (KA5-2) of the fifth relay are connected in series in the electric start path and are located on the input side of the first switch; the normally closed contact (KA4-2) of the fourth relay and the normally open contact (KA5-1) of the fifth relay are connected in series in the gas start path and are located on the input side of the second switch.

[0043] When only the electric start mode selection switch is triggered, the coil of the fourth relay is energized, the normally open contact of the fourth relay is closed, the normally closed contact is open, the input path of the first switch is connected, and the input path of the second switch is disconnected, thereby avoiding false triggering of the gas start path; when only the gas start mode selection switch is triggered, the same reason applies and will not be repeated; and when both the electric start mode selection switch and the gas start mode selection switch are triggered or neither is triggered, the normally open contact and the normally closed contact of the fourth relay and the fifth relay can form a circuit breaker interlock on the electric start path and the gas start path, and cannot be started, which can effectively avoid the electric start motor and the gas start motor from being started at the same time, resulting in waste of resources and low starting efficiency.

[0044] To further reduce the risk of simultaneous starting of the electric starter motor and the gas starter motor, in this embodiment, the fourth relay and the fifth relay both include auxiliary normally open contacts (corresponding to KA4-11 and KA5-11, respectively), and the auxiliary normally open contact of the fourth relay is connected in series between the negative terminal 221 of the gas starter logic switch 202 and the negative power terminal of the logic controller 20, and the auxiliary normally open contact of the fifth relay is connected in series between the negative terminal 221 of the electric starter logic switch 201 and the negative power terminal of the logic controller 20.

[0045] When the electric start mode selection switch is triggered, the coil of the fourth relay is energized, and the secondary normally open contact of the fourth relay is closed, so that the second output terminal 22 of the logic controller 20 can be connected to the negative terminal of the power supply, so that both ends of the coil of the second relay can be connected to the negative terminal of the power supply of the logic controller 20, and the coil of the second relay is prevented from being energized, so that the conduction of the second switch can be prohibited, and the gas start motor can be disabled, so as to avoid the gas start logic switch 202 being accidentally touched during the electric start and triggering the gas start. The same is true for the gas start, which will not be repeated. Therefore, the start mode singleness control can be achieved at the start control module end.

[0046] To improve the convenience of use, in this embodiment, the mode selection unit also includes an automatic mode selection path, which includes an automatic start mode switch and a coil (KA6) of the sixth relay connected in series between the positive end and the negative end of the power supply of the mode selection unit. The two groups of normally open contacts (KA6-1) of the sixth relay are respectively connected in parallel with the series structure of the normally open contact of the fourth relay and the normally closed contact of the fifth relay, and the series structure of the normally closed contact of the fourth relay and the normally open contact of the fifth relay. When the coil of the sixth relay is energized, the interlocking of the electric start path and the gas start path by the fourth relay and the fifth relay can be bypassed. The automatic start mode switch is provided by a switch path in the mode selection switch 30.

[0047] In automatic mode, the logic controller 20 controls the outputs of its first output terminal 21, the second output terminal 22 and the third output terminal 23 according to a preset number of times and sequence to automatically control the conduction of the electric start path and the gas start path. The preset number of times is, for example, 3 times, and the preset sequence is, for example, electric start first and then gas start. When starting in automatic mode, the logic controller 20 connects its first output terminal 21 to the positive terminal of the power supply to start the motor, and monitors the speed of the diesel engine to determine whether the start is successful. If the start is successful, the output of the logic controller 20 is stopped to complete the start. If the start is unsuccessful, the first output terminal 21 is reconnected to the positive terminal of the power supply to retry the electric start. If the start is unsuccessful for three consecutive times, the second output terminal 22 is connected to the positive terminal of the power supply, and the gas start is also tried three times. If the start is successful in three times, the output of the logic controller 20 is stopped. If the start still fails after three times, the start attempt is stopped and an alarm indication is given.

[0048] To improve electrical safety, in this embodiment, the positive ends of the electric starting path and the gas starting path are connected in parallel and connected to the positive end of the driving power supply BT through the main starting control switch Q1. When the starting path is abnormal, the main starting control switch Q1 can be used to control power failure to ensure safety.

[0049] For convenience and practicality, the driving power supply generally includes a battery pack. To ensure the effectiveness of the battery pack, in this embodiment, a charger 101 is also included. The charger 101 is connected to the battery pack for charging. The charger 101 is connected to the diesel engine for transmission. After the diesel engine is successfully started, the battery pack can be charged by the charger 101 to keep the battery pack fully charged, so as to improve the reliability of the next electric start.

[0050] Furthermore, the driving power supply BT includes a battery pack, and the battery pack is also connected to the mains via a floating charger 102 so as to be charged by connecting to the mains via the floating charger 102. When there is power supply from the grid, the battery pack can be charged by the mains to ensure the power of the battery pack and the reliability of electric starting in an emergency.

[0051] To further improve electrical safety, in this embodiment, a power switch Q2 is also connected in series on the negative output path of the driving power supply BT. The driving power supply can be used to supply power to the above-mentioned modules and units. When the power switch Q2 is disconnected, the power supply to the above-mentioned modules and units can be directly disconnected, thereby improving the power safety guarantee capability.

[0052] The utility model also provides a diesel generator set, which includes the above-mentioned diesel engine starting device, and can effectively improve the starting reliability of the diesel generator set.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above-mentioned embodiments only express several specific implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A diesel engine starting device, characterized in that: include: An electric starter motor and a gas starter motor connected to the main shaft of the diesel engine, and a start control module, the start control module includes a start control unit and a start drive unit, wherein: The starting drive unit comprises an electric starting path and an air starting path connected from the positive end to the negative end of the driving power supply, the electric starting path comprises a first switch and a coil of a first electric starting contactor connected in series in a forward direction, the normally open contact of the first electric starting contactor is connected in series between the electric starting motor and the driving power supply, the air starting path comprises a second switch and an electromagnetic valve connected in series in a forward direction, and the electromagnetic valve is connected in series on the air supply pipeline of the air starting motor; The starting control unit includes a logic controller, and the first output terminal, the second output terminal and the third output terminal of the logic controller are respectively connected to the negative power terminal of the logic controller through the coils of the first relay, the second relay and the third relay, and the first output terminal and the second output terminal are respectively connected to the positive power terminal of the logic controller through the electric start logic switch and the gas start logic switch, the first switch and the second switch are the normally open contacts of the first relay and the second relay respectively, and the normally open contact of the third relay is also connected in series to the diesel engine oil valve driving path, and the third output terminal of the logic controller is also connected to the positive power terminal of the logic controller when the electric start logic switch or the gas start logic switch is triggered.

2. The diesel engine starting device according to claim 1, characterized in that: The startup control module further includes a mode selection unit, wherein: The mode selection unit includes an electric start mode selection path and a gas start mode selection path connected in parallel between the positive end of the power supply and the negative end of the power supply of the mode selection unit, the electric start mode selection path includes an electric start mode selection switch and a coil of a fourth relay, and the gas start mode selection path includes a gas start mode selection switch and a coil of a fifth relay; The normally open contact of the fourth relay and the normally closed contact of the fifth relay are connected in series in the electric start path and are located at the input side of the first switch; The normally closed contact of the fourth relay and the normally open contact of the fifth relay are connected in series in the gas starting path and are located on the input side of the second switch.

3. The diesel engine starting device according to claim 1, characterized in that: The startup control module further includes a mode selection unit, wherein: The mode selection unit includes an electric start mode selection path and a gas start mode selection path connected in parallel between the positive end of the power supply and the negative end of the power supply of the mode selection unit, the electric start mode selection path includes an electric start mode selection switch and a coil of a fourth relay, and the gas start mode selection path includes a gas start mode selection switch and a coil of a fifth relay; The fourth relay and the fifth relay both include a secondary normally open contact, and the secondary normally open contact of the fourth relay is connected in series between the negative end of the gas-started logic switch and the negative end of the power supply of the logic controller, and the secondary normally open contact of the fifth relay is connected in series between the negative end of the electric-started logic switch and the negative end of the power supply of the logic controller.

4. The diesel engine starting device according to claim 2, characterized in that: The mode selection unit also includes an automatic mode selection path, which includes an automatic start mode switch and a coil of a sixth relay connected in series between the positive end of the power supply to the negative end of the power supply of the mode selection unit, and two groups of normally open contacts of the sixth relay are respectively connected in parallel with the series structure of the normally open contacts of the fourth relay and the normally closed contacts of the fifth relay, and the series structure of the normally closed contacts of the fourth relay and the normally open contacts of the fifth relay.

5. The diesel engine starting device according to claim 1, characterized in that: The positive ends of the electric starting path and the gas starting path are connected in parallel and are connected to the positive end of the driving power supply through a main starting control switch.

6. The diesel engine starting device according to claim 1, characterized in that: The starting drive unit also includes a second electric starting contactor, a normally open contact of the first electric starting contactor and a coil of the second electric starting contactor are connected in series with the driving power supply, and a normally open contact of the second electric starting contactor and the electric starting motor are connected in series with the driving power supply.

7. The diesel engine starting device according to claim 1, characterized in that: It also includes a charger, the driving power source includes a battery pack, the charger is connected to the battery pack for charging, and the charger is connected to the diesel engine for driving.

8. The diesel engine starting device according to claim 1, characterized in that: The driving power source comprises a battery pack, and the battery pack is also connected to the mains via a floating charger, so as to be charged by connecting to the mains via the floating charger.

9. The diesel engine starting device according to claim 1, characterized in that: A power switch is also connected in series on the negative output path of the driving power supply.

10. A diesel generator set, characterized in that: The diesel engine starting device comprises the diesel engine starting device according to any one of claims 1 to 9.

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