CN212671927U

CN212671927U - Engine cooling system

Info

Publication number: CN212671927U
Application number: CN202021184521.4U
Authority: CN
Inventors: 刘益军; 冉景旭; 毛龙归; 宋路平
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-03-09
Anticipated expiration: 2030-06-23

Abstract

The utility model belongs to the technical field of engines, in particular to an engine cooling system, which comprises an electromagnetic clutch water pump, an engine body, a temperature adjusting device and a water tank, wherein the electromagnetic clutch water pump, the engine body, the temperature adjusting device and the water tank are sequentially connected end to end in a waterway to form a cooling circulation; two water outlets of the temperature adjusting device are respectively communicated with the water tank and the electromagnetic clutch water pump to respectively form engine major cycle and engine minor cycle, the temperature adjusting device comprises a shell, and a first temperature adjuster and a second temperature adjuster which are contained in the shell, the first temperature adjuster and the second temperature adjuster are arranged in a water path in parallel, an outlet water path of the first temperature adjuster and an outlet water path of the second temperature adjuster are converged into one path to be connected to the water tank, and the electromagnetic clutch water pump is set to be 2 or 3 working gears. The utility model discloses a two-stage or tertiary thermoregulator and multistage electromagnetic clutch water pump structure cooperation adjust engine circulation flow, reach the purpose of adjusting water temperature, and the regulation temperature just plans to mend original defect, can satisfy the needs that the start-up needs improve water temperature rapidly and improve, has prevented overheated production again.

Description

Engine cooling system

Technical Field

The utility model belongs to the technical field of the engine, especially, engine cooling system.

Background

With the increasing energy-saving requirement of the engine, the engine is required to maintain a proper working temperature. Conventional engine temperature control systems typically use a thermostat to control the temperature of the outgoing water.

The temperature range adjustable by the existing single-dependence temperature regulator is not wide enough, and the vehicle warming time is long in cold areas. The water-air cooling system disclosed in chinese patent CN109184895A comprises an engine water pump, a low temperature water tank, an engine internal circulation system and an air water cooler, wherein the engine internal circulation system comprises an oil cooler, a body and a cylinder head, a thermostat and an engine high temperature water tank, when the temperature of water entering the thermostat is higher than the opening temperature of the thermostat, the engine large circulation is opened, the engine small circulation is closed, water directly flows back to the high temperature water tank, enters the water pump after being cooled by a radiator in the high temperature water tank, when the temperature of water entering the thermostat is lower than the opening temperature of the thermostat, the engine small circulation is opened, the engine large circulation is closed, and water directly enters the water pump without passing through the high temperature water tank.

And cannot adapt to the rapidly changing requirements of different loads. The traditional engine water pump can only change along with the change of the rotating speed of the engine and can not change along with the change of load and water temperature.

Therefore, in the prior art, there is also an engine cooling method using two thermostat methods, such as an explosion-proof diesel engine warming-up cooling system disclosed in chinese patent CN204627730U, in which water paths from the right bank and the left bank of the crankcase are collected into one and connected to the thermostat housing; the third branch is connected to a water air cooler which is connected to the thermostat shell; two temperature-saving valves in the thermostat are connected with a radiator for cooling the engine body through a water path.

Also for example, chinese patent CN206625887U discloses a thermostat for an engine, which comprises a thermostat base, a thermostat cover, and two thermostats. The thermostat base is provided with a cylinder cover water inlet cavity and a low-temperature water cavity, and two thermostat holes are formed in the thermostat base; the low-temperature water cavity is provided with two water outlet holes and a machine body water outlet. Two thermostats are installed respectively in the thermostat hole, and the thermostat has and closes the thermostat hole and open the first position of apopore and open the second position of thermostat hole and close the apopore.

As a cooling system of an internal combustion engine disclosed in chinese patent CN107044332B, dual heat exchangers are respectively disposed in the high temperature branch and the low temperature branch, and the internal coolant is heated by the engine body and then divided into a first internal coolant branch and a second internal coolant branch: the first internal cooling liquid branch comprises a first thermostat, an auxiliary heat exchanger and a high-temperature intercooler; the second internal cooling liquid branch comprises a second thermostat, a main heat exchanger and a low-temperature-level intercooler; the internal coolant passing through the first internal coolant branch and the second internal coolant branch joins and returns to the engine block to form a closed cooling circuit.

Above-mentioned prior art adopts two thermostat structures, still exists not enoughly, and when adopting two thermostats to be in the state of difference, the flow that the water pump need supply is different, and above-mentioned prior art adopts quantitative water pump, hardly satisfies under the different engine load operating mode with thermostat combination matching work, reaches better cooling effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an engine cooling system adopts two-stage thermoregulator and multistage electromagnetic clutch water pump structure cooperation, adjusts engine circulation flow, reaches the purpose of adjusting water temperature, and the regulation temperature just plans to mend original defect, can satisfy the needs that the start needs improve water temperature rapidly and improve, can prevent overheated when engine heavy load again.

The technical scheme of the utility model as follows:

an engine cooling system comprises an electromagnetic clutch water pump, an engine body, a temperature adjusting device and a water tank, wherein water paths are sequentially connected end to form a cooling cycle; two delivery ports of the temperature adjusting device are respectively communicated with the water tank and the electromagnetic clutch water pump to respectively form engine major cycle and engine minor cycle, the temperature adjusting device comprises a shell and a first temperature adjuster and a second temperature adjuster which are contained in the shell, the first temperature adjuster and the second temperature adjuster are connected in parallel in a water path, the first temperature adjuster and an outlet water path of the second temperature adjuster are converged into one path to be connected to the water tank, and the electromagnetic clutch water pump is set to be 2 or 3 working gears.

The utility model adopts the electromagnetic clutch water pumps with a plurality of gears, the water pumps can change along with the change of load and water temperature, and the clutch is respectively controlled to work at first gear, second gear and third gear according to the water temperature and the engine load; the circulating flow of the engine is adjusted to achieve the purpose of adjusting the temperature of the outlet water;

first thermoregulator and second thermoregulator festival be the thermoregulator structure, the utility model discloses a thermoregulator of two combinations, temperature control range is wide, has increaseed temperature control range, can adapt to more harsh engine sudden change operating mode requirement.

The utility model discloses a combination thermoregulator technique changes the thermoregulator, changes fewly to the engine, and the cost change is also fewly, just can satisfy the demand that improves engine outlet water temperature and carry out the consumption reduction that economizes on fuel, can not produce other troubles from this.

Preferably, the first thermostat and the second thermostat are wax thermostats. Among the parts of the wax type thermostat, the body is the core part of the thermostat, and the water temperature is sensed by the body. When the temperature rises, the temperature sensing wax in the body is heated to expand to push the push rod to move, and the push rod is fixed at the top of the valve seat, so that the body is pushed reversely to move, the body drives the valve to move, and the temperature regulator is started. The structure is simple and the cost is low.

Preferably, the utility model discloses still include engine ECU and set up the temperature sensor of the water inlet department of casing, temperature sensor with electromagnetic clutch water pump all with engine ECU connection of electric lines. The water temperature sensor is used for collecting the water outlet temperature of the engine body, then transmitting data to the engine ECU for processing and then sending an instruction to the electromagnetic clutch water pump, and the engine ECU is adopted to control the electromagnetic clutch water pump to shift gears, so that accurate control can be achieved, and the working reliability of the cooling system is ensured.

Preferably, the initial opening temperature of the first thermostat is 83 ℃, the full opening temperature of the first thermostat is 93 ℃, the initial opening temperature of the second thermostat is 88 ℃, and the full opening temperature of the second thermostat is 98 ℃. The combined design of the main and auxiliary temperature regulators with different opening temperatures is adopted, so that the control range is enlarged from 10 ℃ to 15 ℃, the temperature regulation range is enlarged, and the method can meet the more severe requirement of the sudden change working condition of the engine.

The utility model has the advantages that:

1. the electromagnetic clutch water pump 1 with a plurality of gears is adopted, the water pump can change along with the change of load and water temperature, and the clutch is respectively controlled to work at a first gear, a second gear and a third gear according to the water temperature and the load of an engine; the circulating flow of the engine is adjusted to achieve the purpose of adjusting the temperature of the outlet water;

2. the two combined temperature regulators are adopted, so that the water temperature regulation range is wide, the temperature regulation range is enlarged, and the requirements of more severe sudden change working conditions of the engine can be met.

3. The engine is changed a little, the cost change is also little, the requirement of improving the water outlet temperature of the engine to save oil and reduce consumption can be met, and other faults can not be caused.

Drawings

Fig. 1 is a schematic diagram of an engine cooling system according to the present invention.

Fig. 2 is a schematic structural diagram of the temperature-saving device of the present invention.

Fig. 3 is a schematic diagram of the relationship between the input rotation speed of the electromagnetic clutch water pump at 3 different gears and the rotation speed of the water pump.

Fig. 4 is a schematic structural diagram of the first thermostat and the second thermostat of the present invention, which is a wax thermostat structure.

Fig. 5 is a schematic diagram of a small cycle operation when the thermostat device is not opened according to embodiment 2 of the present invention.

Fig. 6 is a working schematic diagram of the first thermostat in embodiment 2 of the present invention when it is opened, and is in a large circulation condition at this time.

Fig. 7 is a working schematic diagram of the first thermostat and the second thermostat of embodiment 2 of the present invention when both are open, and at this time, the two thermostats are in a large circulation condition.

In the figure: 1-an electromagnetic clutch water pump, 2-an engine body, 3-a temperature adjusting device, 301-a shell, 302-a first temperature adjuster, 303-a second temperature adjuster, 4-a water tank, 5-a water temperature sensor, 6-an engine ECU and 7-a cooling fan.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Example 1:

as shown in fig. 1, an engine cooling system comprises an electromagnetic clutch water pump 1, an engine body 2, a temperature adjusting device 3 and a water tank 4, wherein water paths are sequentially connected end to form a cooling cycle; two water outlets of the temperature adjusting device 3 are respectively communicated with the water tank 4 and the electromagnetic clutch water pump 1 to respectively form a large engine cycle and a small engine cycle,

as shown in fig. 2, the temperature adjusting device 3 includes a housing 301, and a first temperature adjuster 302 and a second temperature adjuster 303 accommodated in the housing 301, the first temperature adjuster 302 and the second temperature adjuster 303 are arranged in a water path in parallel, outlet water paths of the first temperature adjuster 302 and the second temperature adjuster 303 are collected into a path and connected to the water tank 4, and the electromagnetic clutch water pump 1 is set to 3 operating gears. In this embodiment, the electromagnetic clutch water pump 1 adopts the electromagnetic clutch to control the flow of the water pump so as to achieve the purpose of controlling the flow of the engine. According to the water temperature and the engine load, the clutch is respectively controlled to work in the first gear, the second gear and the third gear.

The embodiment adopts the electromagnetic clutch water pump 1 with a plurality of gears, the water pump can change along with the change of load and water temperature, and the clutch is respectively controlled to work at a first gear, a second gear and a third gear according to the water temperature and the load of an engine; the circulating flow of the engine is adjusted to achieve the purpose of adjusting the temperature of the outlet water;

this embodiment the utility model discloses a thermoregulator of two combinations, temperature control range is wide, has increaseed temperature control range, can adapt to more harsh engine sudden change operating mode requirement.

Example 2:

as shown in fig. 1 and 2, the embodiment is applied to an in-line 6-cylinder diesel engine, and the engine cooling system comprises an electromagnetic clutch water pump 1, an engine body 2, a temperature adjusting device 3 and a water tank 4, wherein water paths are sequentially connected end to form a cooling cycle; two water outlets of the temperature adjusting device 3 are respectively communicated with the water tank 4 and the electromagnetic clutch water pump 1 to respectively form a large engine cycle and a small engine cycle, the temperature adjusting device 3 comprises a shell 301, and a first temperature adjuster 302 and a second temperature adjuster 303 which are accommodated in the shell 301,

as shown in fig. 2, the first thermostat 302 and the second thermostat 303 are arranged in a water path in parallel, outlet water paths of the first thermostat 302 and the second thermostat 303 are converged into one path and connected to the water tank 4, and the electromagnetic clutch water pump 1 is set to 3 working gears.

In this embodiment, the electromagnetic clutch water pump 1 is indirectly connected with the power of the engine crankshaft, specifically:

the electromagnetic clutch water pump 1 structurally comprises a shell, a water pump belt pulley, a water pump impeller group, a water pump main shaft and an electromagnetic clutch, wherein the water pump belt pulley is directly in power connection with an engine through an engine crankshaft belt pulley, a middle wheel can be additionally arranged in the middle of the water pump belt pulley, the electromagnetic clutch comprises an electromagnetic coil, a friction plate, a driving disc, a spring piece and a control power supply, the electromagnetic coil is positioned in the water pump belt pulley and is connected with the control power supply, and the electromagnetic coil is fixedly arranged on the shell; the friction plate is connected with the driving disc through the spring piece, the driving disc is connected with one end of the water pump main shaft, the other end of the water pump main shaft extends into the shell to be connected with the water pump impeller set, gear switching of the electromagnetic clutch water pump 1 is achieved through the electromagnetic clutch, and the relation between the input and output rotating speed and the water pump rotating speed of the electromagnetic clutch water pump 1 in different gears is shown in figure 3.

As shown in fig. 4, in the present embodiment, the first thermostat 302 and the second thermostat 303 are wax thermostats, and the product is purchased from carparts manufacturing ltd. The first thermostat and the second thermostat are structurally as follows: the paraffin wax injection device comprises a shell, a spring, a valve and the like, wherein paraffin wax is arranged in the shell, the spring is sleeved on the shell, and the valve is arranged on the shell. Among the parts of the wax type thermostat, the body is the core part of the thermostat, and the water temperature is sensed by the body. When the temperature rises, the temperature sensing wax in the body is heated to expand to push the push rod to move, and the push rod is fixed at the top of the valve seat, so that the body is pushed reversely to move, the body drives the valve to move, and the temperature regulator is started. The structure is simple and the cost is low.

The present embodiment further includes a water temperature sensor 5 disposed at the water inlet of the housing 301, and the water temperature sensor 5 and the electromagnetic clutch water pump 1 are both connected to the engine ECU6 through wires. The engine ECU6 is adopted to control the electromagnetic clutch water pump 1 to shift gears, so that accurate control can be achieved, and the working reliability of the cooling system is ensured.

In this embodiment, the initial opening temperature of the first thermostat 302 is 83 ℃, the full opening temperature of the first thermostat 302 is 93 ℃, the initial opening temperature of the second thermostat 303 is 88 ℃, and the full opening temperature of the second thermostat 303 is 98 ℃. The combined design of the main and auxiliary temperature regulators with different opening temperatures is adopted, so that the control range is enlarged from 10 ℃ to 15 ℃, the temperature regulation range is enlarged, and the method can meet the more severe requirement of the sudden change working condition of the engine.

The cooling method of the engine cooling system in the embodiment comprises the following steps:

step 1: after the engine is started, the electromagnetic clutch water pump 1 can obtain a command of an engine ECU6, a first gear is engaged, the temperature adjusting device 3 is not started at the moment, the engine adopts small circulation cooling as shown in FIG. 5, and the electromagnetic clutch water pump 1 runs at a first speed;

step 2: when the water temperature rises and reaches 60 ℃, the engine ECU6 collects and processes the temperature data of the water temperature sensor 5 and sends a command to the electromagnetic clutch water pump 1, the electromagnetic clutch water pump 1 enters two gears from the first gear for meshing, and the electromagnetic clutch water pump 1 runs at the second gear;

step 3: when the water temperature rises to 75 ℃, the engine ECU6 sends a command to the electromagnetic clutch water pump 1, the electromagnetic clutch water pump 1 rises from the second gear to the third gear, and the electromagnetic clutch water pump 1 reaches a full-meshing state, namely a full-speed state.

step 4: as shown in fig. 6, the engine ECU6 continues to acquire the signal of the water temperature sensor 5, and when the water temperature reaches 83 ℃, the first thermostat 302 starts to be opened, the large circulation cooling is started, and the first thermostat 302 is fully opened after the temperature rises to 93 ℃;

step 5: as shown in fig. 7, the water temperature continuously rises to 88 ℃, the second thermostat 303 starts to be opened, and the second thermostat 303 is fully opened after the temperature rises to 98 ℃;

step 6: the electronic control engine judges whether the engine works normally according to the water temperature of the engine, the water temperature continuously rises to 95 ℃ along with the continuous increase of the load of the engine, and the engine ECU6 controls the radiating fan 7 to start working to keep the water temperature stable in a balance state. In this state the radiator fan 7 will maintain the wind on-off-on-off mode of operation. If the water temperature is too high, the heat dissipation fan 7 cannot be balanced even when operating at full speed. When the water temperature reaches a certain set value, an alarm is given, the fuel injection quantity is reduced when the water temperature reaches 105 ℃, further deterioration is prevented, even cylinder pulling faults occur, fuel injection is recovered when the water temperature is reduced to 102 ℃, and the step6 is entered. Thereby achieving the purpose of protecting the engine.

Example 3:

this embodiment is different from embodiment 1 described above in that: in this embodiment, the electromagnetic clutch water pump 1 is a 2-gear structure, and the clutch is controlled to be in the first gear and the second gear respectively according to the water temperature and the engine load.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An engine cooling system, characterized in that: the engine comprises an electromagnetic clutch water pump (1), an engine body (2), a temperature adjusting device (3) and a water tank (4), wherein water paths are sequentially connected end to form a cooling cycle; two delivery ports of attemperator (3) respectively with water tank (4) with electromagnetic clutch water pump (1) is linked together to form engine major cycle and engine minor cycle respectively, attemperator (3) include casing (301) and hold first thermoregulator (302) and second thermoregulator (303) in casing (301), first thermoregulator (302) with second thermoregulator (303) are parallelly connected to be set up in the water route, first thermoregulator (302) with the export water route integration of second thermoregulator (303) is connected to all the way water tank (4), electromagnetic clutch water pump (1) is for setting up to 2 or 3 work gears.

2. An engine cooling system according to claim 1, characterized in that: the first thermostat (302) and the second thermostat (303) are both wax thermostats.

3. An engine cooling system according to claim 1 or 2, characterized in that: still include engine ECU (6) and set up and be in water temperature sensor (5) of the water inlet department of casing (301), water temperature sensor (5) with electromagnetic clutch water pump (1) all with engine ECU (6) connection of electric lines.

4. An engine cooling system according to claim 1 or 2, characterized in that: the initial opening temperature of the first temperature regulator (302) is 83 ℃, the full opening temperature of the first temperature regulator (302) is 93 ℃, the initial opening temperature of the second temperature regulator (303) is 88 ℃, and the full opening temperature of the second temperature regulator (303) is 98 ℃.