CN111577442B - Outboard engine cooling system - Google Patents
Outboard engine cooling system Download PDFInfo
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- CN111577442B CN111577442B CN202010322245.1A CN202010322245A CN111577442B CN 111577442 B CN111577442 B CN 111577442B CN 202010322245 A CN202010322245 A CN 202010322245A CN 111577442 B CN111577442 B CN 111577442B
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- Prior art keywords
- water pump
- water
- engine
- radiator
- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0276—Draining or purging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/06—Cleaning; Combating corrosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an outboard engine cooling system which comprises a radiator, a first water pump and a second water pump, wherein the first water pump is connected with the radiator and used for pumping first cooling water from the first radiator to an engine, and the second water pump is connected with the radiator and used for pumping the first cooling water provided by an external cooling water source to the radiator. The outboard engine cooling system is compact in arrangement and light in weight, can improve the heat dissipation effect of the engine and maintain the engine to work for a long time at the optimal working temperature; and the use is simple, and the maintenance is convenient.
Description
Technical Field
The invention belongs to the technical field of outboard engines, and particularly relates to an outboard engine cooling system.
Background
The outboard engine is a detachable power device which is hung on a stern board of a boat and can push the boat and the boat to sail, and is also called as an outboard engine, a boat operating machine and a hanging machine. The outboard engine mainly comprises an engine, a transmission device, an operation device, a suspension device, a propeller and the like, has the characteristics of compact structure, light weight, convenient disassembly, simple operation, low noise and the like, and is suitable for being used in inland rivers, lakes and offshore places. Some operation boats are equipped with various propellers for different boats and ships to use when they are unloaded or fully loaded. The engine mainly adopts a two-stroke gasoline engine, but a few diesel engines and motors, the power range is 0.74-221 kilowatts, and the weight is 10-256 kilograms.
The outboard engines using diesel engines are becoming more common and it is determined that diesel outboard engines cannot be widely used due to the technical characteristics of diesel engines. Even if the high-pressure common rail technology is used for a long time, the compression-ignition working principle of the high-pressure common rail technology also ensures that the vibration and the noise are larger during working. It is not a problem for inboard machines mounted in the nacelle, but is fatal for outboard machines suspended from the transom. Diesel engines are typically higher in torque and transmitting high torque also presents a greater challenge to the gearbox. The attraction of diesel outboard engines comes from diesel, which is safer (safer than gasoline) and which does not require additional fuel tanks for traffic boats mounted on large ships fueled by diesel.
The existing diesel outboard engine is generally cooled by a submerged water pump, and external river water or seawater is directly introduced into the diesel engine, because the river water or seawater temperature is lower, and the optimal working temperature of the diesel engine is generally 80-100 ℃, the diesel engine is not beneficial to combustion, friction loss and oil consumption, the cruising mileage and working time are reduced, and the diesel engine is not beneficial to discharge.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The invention provides an outboard engine cooling system, aiming to improve the heat dissipation effect of an engine and maintain the engine to work for a long time at the optimal working temperature.
In order to achieve the purpose, the invention adopts the technical scheme that: the outboard engine cooling system comprises a radiator, a first water pump connected with the radiator and used for pumping first cooling water from the first radiator to an engine, and a second water pump connected with the radiator and used for pumping the first cooling water provided by an external cooling water source to the radiator.
The external cooling water source comprises an ocean and/or a lake.
The radiator is a plate radiator.
And the radiator is integrated with a pressure valve and a liquid level sensor.
The second water pump is a self-suction centrifugal water pump.
The water inlet end of the first water pump is connected with the radiator through a first water inlet pipe, the water outlet end of the engine is connected with the radiator through a first water return pipe, and the water outlet end of the engine is provided with a temperature sensor.
The outboard engine cooling system further comprises a filtering device which is connected with the second water pump and is used for filtering second cooling water provided by an external cooling water source.
The water outlet end of the second water pump is connected with the radiator through a second water inlet pipe, and the second water inlet pipe is a rubber pipe.
The outboard engine cooling system is compact in arrangement and light in weight, can improve the heat dissipation effect of the engine and maintain the engine to work for a long time at the optimal working temperature; and the use is simple, and the maintenance is convenient.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic structural view of an outboard engine cooling system of the present invention;
FIG. 2 is a graph of water pump power versus water temperature;
FIG. 3 is a graph of input PWM versus motor speed;
labeled as:
1. an engine; 2. a heat sink; 3. a second water pump; 4. a liquid level sensor; 5. a temperature sensor; 6. a pressure valve.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.
As shown in fig. 1, the present invention provides an outboard engine cooling system including a radiator, a first water pump connected to the radiator for pumping first cooling water from the first radiator to an engine, and a second water pump connected to the radiator for pumping first cooling water supplied from an external cooling water source to the radiator.
Specifically, the engine cooling system may maintain the engine within a suitable temperature range under all operating conditions, prevent overheating or overcooling of the engine, and quickly warm up the engine after a cold start of the engine, minimizing warm-up time. The ideal engine operating condition is a low cylinder head temperature and a relatively high cylinder block temperature. The lower temperature of the cylinder cover can improve the charging efficiency and increase the air input. The low temperature and large air intake can promote complete combustion, reduce the formation of CO, HC and NOx and improve the output power. Higher cylinder block temperatures reduce friction losses, directly improve fuel efficiency, and indirectly reduce in-cylinder peak pressures and temperatures.
As shown in figure 1, the water inlet end of the first water pump is connected with the radiator through a first water inlet pipe, the water outlet end of the engine is connected with the radiator through a first water return pipe, and the water outlet end of the second water pump is connected with the radiator through a second water inlet pipe. The water outlet end of the engine is provided with a temperature sensor, and the temperature of the first cooling water at the water outlet end of the engine is detected through the temperature sensor so as to control the operation of a water pump of the accessory cooling system. The engine is a gasoline engine or a diesel engine, the first water pump is connected with a crankshaft of the engine, and the first water pump is driven by the crankshaft of the engine to run. The radiator is provided with a first water outlet, a first water return opening, a water inlet and a second water outlet, one end of the first water inlet pipe is connected with the first water outlet of the radiator, the other end of the first water inlet pipe is connected with the water inlet end of the first water pump, and the water outlet end of the first water pump is connected with the water inlet end connected with the engine. One end of the first water return pipe is connected with a water outlet end of the engine, the other end of the first water return pipe is connected with a first water return opening of the radiator, and the first water return pipe guides first cooling water from the engine into the radiator. One end of the second water inlet pipe is connected with the water outlet end of the second water pump, the other end of the second water inlet pipe is connected with the water inlet of the radiator, the second water outlet of the radiator is connected with an external cooling water source through a water discharge pipe, and the water discharge pipe guides the second cooling water discharged from the radiator to the external cooling water source.
The external cooling water source comprises a sea and/or a lake. That is, the second cooling water of the external cooling water source may be from the sea, from the lake, or from a combination of the two, and is not limited herein.
Preferably, the heat sink is a plate heat sink, and the structure thereof is well known to those skilled in the art and will not be described herein. The radiator is made of stainless steel, the size is small by adopting a welding process, one side of the radiator is an engine coolant side and is connected with an engine, and the other side of the radiator is a water side and is connected with external seawater or fresh water, so that the radiator can resist seawater and fresh water corrosion. The temperature of the second cooling water entering the radiator is lower than that of the first cooling water entering the radiator, and the second cooling water entering the radiator and the first cooling water entering the radiator are subjected to heat exchange, so that the temperature of the first cooling water can be reduced, the cooled first cooling water flows to the engine, and the purpose of heat dissipation and cooling of the engine is achieved.
As shown in fig. 1, a pressure valve and a liquid level sensor are integrated on the radiator. The pressure valve is used for pressure relief and water supplement of the radiator, and when the pressure in the radiator reaches a set value, the pressure valve is opened to relieve the pressure. The liquid level sensor is used for detecting the water level height in the radiator, can detect whether the radiator lacks water, is convenient for investigate the liquid level of the engine, and avoids the engine fault caused by water shortage.
Preferably, the second water pump is a self-priming centrifugal water pump, and the second water pump is driven by a motor to operate. When the engine works, the second water pump can work through temperature feedback when the temperature of the engine is required to be reduced, the working flow of the water pump is adjusted according to the temperature, and the engine is maintained to work at a certain temperature. The self-suction centrifugal water pump is small in size, occupied space can be reduced, and the whole size and weight of the outboard engine can be reduced. The second water pump is a stainless steel part and can resist seawater and fresh water corrosion. And radiator and second water pump fixed mounting are on the engine, and radiator and second water pump and engine integration are integrative, can make the structure of whole outboard engine compacter, do not increase the size.
Preferably, the outboard engine cooling system of the present invention further includes a filter device connected to the second water pump and configured to filter the second cooling water supplied from the external cooling water source. The end of intaking of second water pump is connected with filter equipment's play water end through the third inlet tube, and filter equipment's the end of intaking is connected with external cooling water source through the fourth inlet tube, through the impurity in the filter equipment second cooling water, protects water pump and radiator, improves life.
Preferably, the first water inlet pipe, the second water inlet pipe, the third water inlet pipe and the fourth water inlet pipe are all rubber pipes.
The liquid level sensor, the temperature sensor and the second water pump are electrically connected with the engine control unit, the liquid level sensor transmits detected liquid level data to the engine control unit, the temperature sensor transmits detected temperature data to the engine control unit, and the second water pump is controlled by the engine control unit. The liquid level sensor monitors the liquid level height, and if the liquid level height in the radiator is detected to be lower than a set value, the engine control unit sends out an alarm signal, and the display unit gives an alarm.
As shown in fig. 2, when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine is lower than a set value, the engine control unit generates a signal to the second water pump to control the second water pump not to work; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine exceeds 80 ℃, the engine control unit controls the second water pump to start working, the second water pump pumps the second cooling water to the radiator, and the power of the second water pump is 30% of the maximum power; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine reaches 100 ℃, the engine control unit controls the second water pump to work at the maximum power; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine is within the range of 80-100 ℃, the engine control unit linearly controls the second water pump, and along with the increase of the temperature of the first cooling water at the water outlet end of the engine, the engine control unit linearly increases the power of the second water pump. And the rotating speed of the electronic water pump is linearly adjusted along with the rise of the water temperature, so that the power of the water pump is linearly improved. Prediction is carried out at 110 ℃, a customer is reminded to check the engine, and the electronic water pump is carried out according to the maximum power.
The control program of the second water pump calculates a target rotation speed according to the influence of factors such as the current actual rotation speed, a PWM (pulse width modulation) request state, a power limiting state, a fault state and the like.
When the second water pump is in a normal operation state, the operation rotation speed of the second water pump is related to the duty ratio of the input PWM signal, and the corresponding relationship between the duty ratio of the input PWM signal and the target rotation speed of the second water pump is shown in fig. 3.
Since the input PWM signal has a 1% error, the use of critical points is avoided. In order to avoid the jitter of the control state on the critical value, a return difference of 1% is set (for example, in order to avoid the jitter when the critical value is 30%, the rotating speed of the second water pump is 0 when the duty ratio of the input PWM signal is set to be less than or equal to 29.5%, and the rotating speed of the second water pump operates according to the PWM duty ratio when the duty ratio of the input PWM signal is set to be greater than or equal to 31.5%).
The corresponding relation between the operating rotating speed of the second water pump and the duty ratio of the input PWM signal is as follows:
when the duty ratio of the input PWM signal is equal to 0, the rotating speed n of the second water pump is equal to MAX;
the duty ratio of the input PWM signal is more than or equal to 0% and less than or equal to 29.5%, and then the rotating speed n of the second water pump is 0;
the duty ratio of the input PWM signal is more than or equal to 30.5 percent and less than or equal to 84.5 percent, and the rotating speed n of the second water pump is between MIN and MAX;
if the duty ratio of the input PWM signal is larger than 85.5%, the rotating speed n of the second water pump is MAX;
and if the duty ratio of the input PWM signal is equal to 100%, the rotating speed n of the second water pump is equal to MAX.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (7)
1. Outboard engine cooling system, its characterized in that: the system comprises a radiator, a first water pump which is connected with the radiator and used for pumping first cooling water from the radiator to an engine, and a second water pump which is connected with the radiator and used for pumping second cooling water provided by an external cooling water source to the radiator;
a liquid level sensor is integrated on the radiator, a temperature sensor is arranged at the water outlet end of the engine, the liquid level sensor, the temperature sensor and the second water pump are electrically connected with the engine control unit, the liquid level sensor transmits detected liquid level data to the engine control unit, the temperature sensor transmits detected temperature data to the engine control unit, and the second water pump is controlled by the engine control unit;
when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine is lower than a set value, the engine control unit generates a signal to the second water pump to control the second water pump to stop working; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine exceeds 80 ℃, the engine control unit controls the second water pump to start working, the second water pump pumps the second cooling water to the radiator, and the power of the second water pump is 30% of the maximum power; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine reaches 100 ℃, the engine control unit controls the second water pump to work at the maximum power; when the temperature sensor detects that the temperature of the first cooling water at the water outlet end of the engine is within the range of 80-100 ℃, the engine control unit linearly controls the second water pump, and along with the rise of the temperature of the first cooling water at the water outlet end of the engine, the engine control unit linearly increases the power of the second water pump;
the rotating speed of the electronic water pump is linearly adjusted along with the rise of the water temperature, and the power of the water pump is linearly improved; forecasting at 110 ℃, reminding a customer to check the engine, and carrying out the electronic water pump according to the maximum power;
the control program of the second water pump can calculate a target rotating speed according to the influence of the current actual rotating speed, the PWM request state, the power limiting state and the fault state;
when the second water pump is in a normal operation state, the operation rotating speed of the second water pump is related to the duty ratio of the input PWM signal;
the corresponding relation between the operating rotating speed of the second water pump and the duty ratio of the input PWM signal is as follows:
if the duty ratio of the input PWM signal is =0, the rotating speed n of the second water pump is = MAX;
the duty ratio of the input PWM signal is more than or equal to 0% and less than or equal to 29.5%, and then the rotating speed n of the second water pump is = 0;
the duty ratio of the input PWM signal is more than or equal to 30.5% and less than or equal to 84.5%, and the rotating speed n of the second water pump is between MIN and MAX;
if the duty ratio of the input PWM signal is larger than 85.5%, the rotating speed n of the second water pump is = MAX;
and the duty ratio of the input PWM signal is =100%, the rotating speed n of the second water pump is = MAX.
2. The outboard engine cooling system according to claim 1, wherein: the external cooling water source comprises an ocean and/or a lake.
3. The outboard engine cooling system according to claim 1, wherein: the radiator is a plate radiator.
4. The outboard engine cooling system according to any one of claims 1 to 3, wherein: the second water pump is a self-suction centrifugal water pump.
5. The outboard engine cooling system according to any one of claims 1 to 3, wherein: the water inlet end of the first water pump is connected with the radiator through a first water inlet pipe, and the water outlet end of the engine is connected with the radiator through a first water return pipe.
6. The outboard engine cooling system according to any one of claims 1 to 3, wherein: the water pump is connected with the first water pump and is used for filtering first cooling water provided by an external cooling water source.
7. The outboard engine cooling system according to any one of claims 1 to 3, wherein: the water outlet end of the second water pump is connected with the radiator through a second water inlet pipe, and the second water inlet pipe is a rubber pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010322245.1A CN111577442B (en) | 2020-04-22 | 2020-04-22 | Outboard engine cooling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010322245.1A CN111577442B (en) | 2020-04-22 | 2020-04-22 | Outboard engine cooling system |
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| CN111577442A CN111577442A (en) | 2020-08-25 |
| CN111577442B true CN111577442B (en) | 2022-03-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1136982A (en) * | 1997-07-23 | 1999-02-09 | Suzuki Motor Corp | Cooling water circulation system |
| CN2633745Y (en) * | 2003-08-19 | 2004-08-18 | 重庆宗申技术开发研究有限公司 | Outdoor machine with double circulation cooler |
| CN102431638A (en) * | 2010-09-29 | 2012-05-02 | 联合船舶设计发展中心 | Cooling system for shipboard power device |
| CN205686598U (en) * | 2016-06-16 | 2016-11-16 | 浙江迅鲨动力设备有限公司 | Shipboard cooling system |
| CN207000799U (en) * | 2017-03-16 | 2018-02-13 | 江西为民机械有限公司 | A kind of energy saving shipboard cooling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090318039A1 (en) * | 2008-06-23 | 2009-12-24 | Hays Kevin P | Boat engine cooling system |
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2020
- 2020-04-22 CN CN202010322245.1A patent/CN111577442B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1136982A (en) * | 1997-07-23 | 1999-02-09 | Suzuki Motor Corp | Cooling water circulation system |
| CN2633745Y (en) * | 2003-08-19 | 2004-08-18 | 重庆宗申技术开发研究有限公司 | Outdoor machine with double circulation cooler |
| CN102431638A (en) * | 2010-09-29 | 2012-05-02 | 联合船舶设计发展中心 | Cooling system for shipboard power device |
| CN205686598U (en) * | 2016-06-16 | 2016-11-16 | 浙江迅鲨动力设备有限公司 | Shipboard cooling system |
| CN207000799U (en) * | 2017-03-16 | 2018-02-13 | 江西为民机械有限公司 | A kind of energy saving shipboard cooling system |
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| CN111577442A (en) | 2020-08-25 |
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