CN114592987A - Cylinder head and engine cooling system - Google Patents

Abstract

The invention provides a cylinder cover and an engine cooling system, which relate to the technical field of engines and are used for solving the technical problem that a cooling channel is easy to block; the cover body is also provided with a liquid inlet, a first channel and a second channel, and the liquid inlet is used for being connected with an external cooling water tank; the other end of the first channel is communicated with a cooling cavity of the oil sprayer, and the other end of the second channel is communicated with the cooling gap. In this embodiment, first passageway and second passageway all are connected with external cooling water tank through the inlet, can simplify cooling system, and in addition, the coolant liquid that is used for cooling the exhaust valve seat insert comes from external cooling water tank, can avoid the sand grain to block up the cooling hole between cooling gap and the second passageway, has improved the life of exhaust valve seat insert.

Description

Cylinder head and engine cooling system

Technical Field

The invention relates to the technical field of engines, in particular to a cylinder cover and an engine cooling system.

Background

The cylinder cover is a main part of an engine structure and is used for sealing a cylinder and forming a combustion space together with a piston, a fuel injector liner hole and an exhaust valve seat ring hole are usually formed in the cylinder cover, wherein the fuel injector liner hole is used for installing a fuel injector, the exhaust valve seat ring hole is used for installing an exhaust valve seat ring, a cooling gap is formed between the exhaust valve seat ring hole and the exhaust valve seat ring, when the engine works, a large amount of heat can be released, and if the heat cannot be diffused out of the cylinder cover in time, the faults of burning loss of the fuel injector and the exhaust valve seat ring easily occur.

In the related art, a cooling chamber for containing a coolant is generally provided in the cylinder head, the cooling chamber communicates with the cooling gap through a cooling hole, and heat of the exhaust valve is released by circulation of the coolant.

However, when the cylinder head is manufactured, sand particles are easily left in the cooling cavity, and the sand particles can flow along with the cooling liquid and block the cooling hole, so that the exhaust valve seat ring is damaged, and the service life of the exhaust valve seat ring is shortened.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a cylinder head and an engine cooling system, which can prevent sand from blocking a cooling hole, avoid an excessive temperature of an exhaust valve seat ring, and improve a service life of the exhaust valve seat ring.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

a first aspect of an embodiment of the present invention provides a cylinder head, including a cover body having a fuel injector liner hole and an exhaust valve seat ring hole, a fuel injector being installed in the fuel injector liner hole, an exhaust valve seat ring being installed in the exhaust valve seat ring hole, and a cooling gap being formed between the exhaust valve seat ring hole and the exhaust valve seat ring;

the cover body is also provided with a liquid inlet, a first channel and a second channel which are respectively communicated with the liquid inlet, and the liquid inlet is used for being connected with an external cooling water tank;

one end of the first channel, which is far away from the liquid inlet, is communicated with the cooling cavity of the oil sprayer, and one end of the second channel, which is far away from the liquid inlet, is communicated with the cooling gap.

The cylinder head as described above, wherein the first passage includes a first sub-passage and a second sub-passage communicating with the first sub-passage, the second sub-passage communicating with a cooling chamber of the injector;

the axes of the first and second sub-channels are perpendicular to each other.

The cylinder head as described above, wherein the second sub-passage includes a first section and a second section connected to the first section, the second section having a diameter smaller than a diameter of the first section.

The cylinder cover as described above, wherein the cover further includes a liquid outlet, and a third channel and a fourth channel communicated with the liquid outlet, wherein one end of the third channel facing away from the liquid outlet is communicated with the cooling cavity of the fuel injector, and one end of the fourth channel facing away from the liquid outlet is communicated with the cooling gap.

The cylinder cover as described above, wherein the cover body further has a fifth channel, one end of the fifth channel is connected to the liquid inlet, and the other end of the fifth channel is connected to the first channel and the second channel, respectively.

A second aspect of the embodiment of the present invention provides an engine cooling system, which includes a cooling water tank and the cylinder head as described above, wherein a liquid inlet pipeline of the cooling water tank is connected to the liquid inlet, and a liquid return pipeline of the cooling water tank is connected to a liquid outlet of the cylinder head.

The engine cooling system further comprises a controller, a radiator, an electric temperature regulating valve and a first temperature sensor, wherein the radiator, the electric temperature regulating valve and the first temperature sensor are all arranged on the liquid inlet pipeline, and the controller is respectively connected with the electric temperature regulating valve and the first temperature sensor;

the first temperature sensor is used for detecting the temperature of cooling liquid in the liquid inlet pipeline and sending the temperature to the controller;

the controller is used for controlling the opening degree of the electric temperature regulating valve according to the temperature.

The engine cooling system is characterized in that a water pump is arranged on a liquid inlet pipeline between the cooling water tank and the electric temperature regulating valve.

The cooling system for the engine comprises a first temperature sensor, a second temperature sensor, a liquid inlet pipeline, a liquid return pipeline, an electric bypass valve, a controller and a bypass pipeline, wherein the first temperature sensor is arranged on the first temperature sensor, the second temperature sensor is arranged on the second temperature sensor, the electric bypass valve is arranged on the second temperature sensor, and the controller is connected with the electric bypass valve.

The engine cooling system as described above, further comprising a filter, a flow meter, and a second temperature sensor, wherein the flow meter and the second temperature sensor are both connected to the controller;

the filter is arranged on the liquid inlet pipeline and is positioned between the electric temperature regulating valve and the electric bypass valve;

the flowmeter is arranged on the liquid inlet pipeline and is positioned between the first temperature sensor and the filter;

the second temperature sensor is arranged on the liquid return pipeline.

In the cylinder cover and the engine cooling system provided by the embodiment of the invention, the first channel and the second channel are arranged on the cylinder cover and are both connected with an external cooling water tank through the liquid inlet, so that the cooling system can be simplified on one hand, the preparation is simple, and on the other hand, the cooling liquid for cooling the exhaust valve seat ring comes from the external cooling water tank.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the cylinder head and the engine cooling system provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a cylinder head provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a fuel injector provided in accordance with an embodiment of the present invention;

FIG. 3 is a first schematic structural diagram of an engine cooling system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second engine cooling system according to an embodiment of the present invention.

Reference numerals:

10: a cover body; 11: a liquid inlet; 12: a liquid outlet;

20: an oil injector; 21: a cooling chamber; 22: a cooling inlet; 23: a cooling outlet;

30: an exhaust valve seat ring hole;

40: an exhaust valve seat ring;

50: a first channel; 51: a first sub-channel; 52: a second sub-channel; 521: a first stage; 522: a second stage; 53: a transition section;

60: a second channel;

70: a third channel; 71: a third sub-channel; 72: a fourth sub-channel;

80: a fourth channel;

90: a fifth channel;

100: a cooling water tank;

110: a controller;

120: an electric thermostat valve;

130: a heat sink;

140: a first temperature sensor;

150: a liquid inlet pipeline;

160: a water pump;

170: a bypass line;

180: a return line;

190: an electrically-powered bypass valve;

200: a filter;

210: a flow meter;

220: a second temperature sensor.

Detailed Description

When the engine is operated for a period of time, there is a significant amount of heat at the fuel injector and exhaust valve seat, and in order to dissipate this heat, relatively independent cooling passages are typically provided in the cylinder head. One end of one cooling channel is connected with external cooling equipment, the other end of the cooling channel is communicated with a cooling cavity of the oil injector, one end of the other cooling channel is communicated with a cooling water cavity of the cylinder cover, and the other end of the other cooling channel is communicated with a cooling gap between the exhaust valve seat ring and the exhaust valve seat ring hole, but the cooling mode has the following defects: firstly, residual sand grains exist in a cooling water cavity of the engine in the casting process, and the sand grains can block cooling holes between a cooling gap and the cooling water cavity, so that the temperature of an exhaust valve seat ring is overhigh; secondly, the cooling of the oil injector and the exhaust valve seat ring needs two sets of cooling systems, and the defects of incapability of unified control and complex structure exist.

In view of the above technical problems, embodiments of the present invention provide a cylinder head and an engine cooling system, in which a first channel and a second channel are disposed on the cylinder head, and both the first channel and the second channel are connected to an external cooling water tank through a liquid inlet, so that on one hand, the cooling system can be simplified, and the cooling system has the advantage of simple preparation, and on the other hand, a cooling liquid for cooling an exhaust valve seat ring comes from the external cooling water tank.

In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all 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.

As shown in fig. 1 and 2, the cylinder head according to the embodiment of the present invention includes a cover 10, the cover 10 is used for sealing a cylinder and forms a combustion space together with a piston, wherein the shape of the cover 10 can be freely set according to the needs of a customer or the model of a product.

The cover 10 is provided with an oil injector 20, for example, the oil injector 20 may be installed on an oil passage of the cover 10, and is configured to atomize the high-pressure fuel, so that the high-pressure fuel is injected into the cylinder in an atomized state, and then the fuel is provided for the cylinder.

The cover 10 is provided with an exhaust port for discharging exhaust gas generated by combustion of the engine and dissipating heat, wherein the exhaust valve seat ring 40 is installed in the exhaust port through the exhaust valve seat ring hole 30, and is used for sealing the exhaust port.

Since the exhaust valve seat ring 40 has a relatively high temperature during use and needs to be cooled, a distance is provided between the inner surface of the exhaust valve seat hole 30 and the outer surface of the exhaust valve seat ring 40, so that a cooling gap (not shown) is formed between the exhaust valve seat hole 30 and the exhaust valve seat ring 40 to facilitate the circulation of the cooling fluid.

Wherein the cooling gap may surround the exhaust valve seat ring 40, so that the contact area between the cooling liquid and the exhaust valve seat ring 40 may be increased, so as to cool down the exhaust valve seat ring 40 quickly. In addition, a cooling hole (not shown) may be formed in the exhaust valve seat hole 30 to facilitate the external cooling fluid to enter the cooling gap.

The cover body 10 is further provided with a liquid inlet 11, a first channel 50 and a second channel 60 which are respectively communicated with the liquid inlet 11, the liquid inlet 11 is used for being connected with an external cooling water tank, one end of the first channel 50, which deviates from the liquid inlet 11, is communicated with the cooling cavity 21 of the oil injector 20, and one end of the second channel 60, which deviates from the liquid inlet 11, is communicated with the cooling gap.

So set up, can introduce first passageway and second passageway respectively with the coolant liquid in the cooling water tank, utilize same coolant liquid to carry out cooling to sprayer and exhaust valve seat insert respectively, in the correlation technique, sprayer and exhaust valve seat insert adopt relatively independent cooling system's technical scheme to compare, cooling system can be simplified on the one hand, simple advantage of preparation has, on the other hand, can not carry the remaining grains of sand in the cooling chamber of cylinder head in the coolant liquid, and then can avoid the grains of sand to block up the cooling hole between cooling gap and the second passageway, the life of exhaust valve seat insert has been improved.

In some embodiments, the first passage 50 includes a first sub-passage 51 and a second sub-passage 52 communicating with the first sub-passage 51, the second sub-passage 52 communicating with the cooling chamber 21 of the fuel injector 20; the axes of the first and second sub-passages 51, 52 are perpendicular to each other so that the first passage is shaped like an L to facilitate the machining of the first passage.

In the present embodiment, the diameter of the first channel 50 is different from the diameter of the second channel 60, for example, the diameter of a portion of the first channel 50 is larger than the diameter of the second channel 60.

In some embodiments, the second sub-channel 52 includes a first section 521 and a second section 522 connected to the first section 521, and the diameter of the second section 522 is smaller than that of the first section 521, so that the flow rate of the cooling liquid at the second section 522 can be increased, so that the cooling liquid can rapidly enter the cooling cavity of the fuel injector, and the cooling effect can be improved; in addition, the diameter of the first section 521 is larger, so that the difficulty of machining the first section 521 can be reduced, and the safety of a drill bit during drilling the first section can be improved.

The ratio of the diameter of the first section 521 to the diameter of the second section 522 is 1.5-2, and thus, the ratio of the flow of the cooling liquid flowing to the fuel injector 20 to the flow of the cooling liquid flowing to the exhaust valve seat ring 40 can be controlled to be 3:7, and the cooling effect of the fuel injector and the cooling effect of the exhaust valve seat ring can be ensured.

In this embodiment, a transition section 53 may be further disposed at a connection position of the second sub-passage 52 and the first sub-passage 51, and diameters of the transition section 53 are both larger than those of the first sub-passage 51 and the second sub-passage 52, so as to reduce a vortex formed at a connection position where the coolant flows through the first sub-passage 51 and the second sub-passage 52, thereby reducing damage to the second sub-passage 52 and improving a service life of the cylinder head.

In some embodiments, the cover body 10 further includes a liquid outlet 12, and a third passage 70 and a fourth passage 80 communicating with the liquid outlet 12, wherein an end of the third passage 70 facing away from the liquid outlet 12 communicates with the cooling cavity 21 of the fuel injector 20, and an end of the fourth passage 80 facing away from the liquid outlet 12 communicates with the cooling gap.

In this embodiment, the diameter of the third passage 70 may be equal or different from place to place, for example, as shown in fig. 1, the third passage 70 includes a third sub-passage 71 and a fourth sub-passage 72 connected to the third sub-passage 71, and the third sub-passage 71 is connected to the cooling outlet 23 of the fuel injector 20, where the diameter of the third sub-passage 71 may be equal or different from place to place, for example, the diameter of a section of the third sub-passage 71 close to the fuel injector 20 is smaller than that of a section close to the fourth sub-passage 72, and with this arrangement, the flow rate of the cooling liquid flowing through the third passage may be controlled, and the cooling effect of the cylinder head is ensured.

After the coolant enters through the liquid inlet 11 of the cylinder head, a part of the coolant flows to the fuel injector 20 through the first channel 50 and enters the cooling cavity 21 through the cooling inlet 22 of the fuel injector 20, and after the fuel injector 20 is cooled, the coolant can flow out of the cooling cavity 21 through the cooling outlet 23 of the fuel injector 20 and then flow out of the cylinder head through the third channel 70 and the liquid outlet 12.

Another portion of the coolant flows through the second passage 60 to the cooling gap and, after cooling the exhaust valve seat insert 40, exits the cylinder head through the fourth passage 80 and the outlet port 12.

So set up, can utilize same coolant liquid to carry out cooling to sprayer and exhaust valve seat circle respectively, with the correlation technique in, sprayer and exhaust valve seat circle adopt relatively independent cooling system's technical scheme to compare, can simplify cooling system on the one hand, have the simple advantage of preparation, on the other hand can not carry the sand grain of remaining in the cooling chamber of cylinder head in the coolant liquid, and then can avoid the sand grain to block up the cooling hole between cooling gap and the second passageway, improved the life of exhaust valve seat circle.

In some embodiments, the cap body 10 further has a fifth channel 90, one end of the fifth channel 90 is connected to the loading port 11, and the other end of the fifth channel 90 is connected to the first channel 50 and the second channel 60, respectively.

In this embodiment, the fifth channel 90 is provided to buffer the cooling liquid, so that on one hand, the flushing of the first channel 50 and the second channel 60 can be reduced, and on the other hand, the flow direction of the cooling liquid can be better controlled.

As shown in fig. 3 and 4, an embodiment of the present invention also provides an engine cooling system, including: the cooling water tank 100 and the cylinder head in any of the above embodiments, the liquid inlet pipeline 150 of the cooling water tank 100 is connected to the liquid inlet 11, the liquid return pipeline 180 of the cooling water tank 100 is connected to the liquid outlet 12 of the cylinder head, and the cooling water tank 100 is used for supplying cooling liquid to the cylinder head.

Wherein, install the pressure lid on cooling water tank 100, the cracking pressure of this pressure lid is 100kPa, can avoid forming the low-pressure zone in the cylinder head, and then can avoid the emergence of cavitation erosion trouble, has improved the life of cylinder head.

At present, cooling water in a cooling cavity in an engine is generally adopted for cooling the exhaust valve seat ring as cooling power, but the influence on the exhaust valve seat ring caused by the operating condition of the engine is not considered, for example, when the engine is in a high-speed low-load condition for a long time, if the temperature of the cooling water is not changed, the exhaust valve seat ring is at a supercooling risk, so that the exhaust valve is abnormally abraded, and for example, when the engine is in a low-speed high-load condition for a long time, the exhaust valve seat ring is at a risk of insufficient cooling, so that the exhaust valve is abnormally abraded.

In view of the above problems, in the present embodiment, an external cooling system is adopted for cooling the exhaust valve seat ring and the injector, and the cooling system is improved, for example, the cooling system further includes a controller 110, an electric temperature regulating valve 120, a radiator 130, and a first temperature sensor 140, where the controller 110 is connected to the first temperature sensor 140 and the electric temperature regulating valve 120, respectively, and the radiator 130, the electric temperature regulating valve 120, and the first temperature sensor 140 are sequentially disposed on the liquid inlet pipeline 150 along the flowing direction of the coolant, that is, the radiator 130 is located between the cooling water tank 100 and the electric temperature regulating valve 120, and the radiator 130 radiates the coolant located in the liquid inlet pipeline 150 to primarily regulate the temperature of the coolant.

The first temperature sensor 140 is used to detect the temperature of the cooling fluid in the inlet line 150 and send the temperature to the controller 110.

The controller 110 stores a threshold temperature therein, and the controller 110 can receive the temperature detected by the first temperature sensor 140, compare the temperature with the threshold temperature, and control the opening degree of the electric thermostat valve 120 according to the temperature to prevent the coolant from being too cold or too hot.

In this embodiment, the temperature adjustment range of the electric temperature adjustment valve 120 is 80-86 ℃, when the first temperature sensor 140 detects that the temperature of the coolant in the liquid inlet pipeline 150 is lower than the set temperature, the detection signal is transmitted to the controller 110, and the controller 110 reduces the opening degree of the electric temperature adjustment valve 120, reduces the heat loss of the coolant, and increases the temperature of the coolant to the set value according to the temperature detected by the first temperature sensor 140.

When the first temperature sensor 140 detects that the temperature of the coolant in the inlet line is higher than the set temperature, the detection signal is transmitted to the controller 110, and the controller 110 increases the opening of the electric thermostat 120 according to the temperature detected by the first temperature sensor 140, increases the heat dissipation capacity of the coolant, and decreases the temperature of the coolant to the set value.

In some embodiments, as shown in fig. 3, a water pump 160 is disposed on the liquid inlet pipeline 150 between the cooling water tank 100 and the electric thermostat valve 120, and the water pump 160 is used for delivering the cooling liquid in the cooling water tank 100 to the liquid inlet 11 of the cylinder head, so as to achieve circulation of the cooling liquid in the cylinder head, so as to take away heat on the fuel injector 20 and the exhaust valve seat ring 40, and achieve cooling of the fuel injector 20 and the exhaust valve seat ring 40.

In some embodiments, the cooling system further includes a bypass line 170, one end of the bypass line 170 is connected to the liquid inlet line 150 between the electric thermostat valve 120 and the first temperature sensor 140, the other end of the bypass line 170 is connected to the liquid return line 180, and an electric bypass valve 190 is disposed on the bypass line 170, and the electric bypass valve 190 is connected to the controller 110.

In the present embodiment, the amount of the coolant entering the liquid inlet of the cylinder head is controlled by controlling the opening size of the electric bypass valve 190, for example, the electric bypass valve 190 can divide the flow rate of the coolant into four stages, i.e., high, medium, low and ultra-low, wherein when the electric bypass valve 190 is in a completely closed state, i.e., when the electric bypass valve 190 is in a high-grade state, 100% of the coolant coming out of the water pump flows to the liquid inlet 11 of the cylinder head; when the electric bypass valve 190 is in the middle gear state, 1/3 of the coolant from the water pump returns to the coolant tank 100 through the electric bypass valve 190, and the rest 2/3 of the coolant enters the liquid inlet 11 of the cylinder head through the liquid inlet pipeline 150; when the electric bypass valve 190 is in a low gear state, 2/3 of the coolant from the water pump returns to the coolant tank 100 through the electric bypass valve 190, and the rest 1/3 of the coolant enters the liquid inlet 11 of the cylinder head through the liquid inlet pipeline 150; when the electric bypass valve 190 is in the ultra-low gear state, 90% of the coolant from the water pump returns to the coolant tank 100 through the electric bypass valve 190, and the remaining 10% of the coolant enters the liquid inlet 11 of the cylinder head through the liquid inlet pipeline 150.

So set up, through electric bypass valve 190's setting, can guarantee cooling system's cooling effect according to the flow of the coolant liquid of the actual operating condition control flow direction cylinder head of engine, and then improved the life of engine.

In some embodiments, the cooling system further includes a filter 200, the filter 200 is disposed on the liquid inlet pipeline 150 and is located between the electric thermostat valve and the electric bypass valve, and impurities in the cooling liquid can be filtered through the filter 200, so that the purity of the cooling liquid entering the cylinder head is improved, and further, the channel in the cylinder head is prevented from being blocked, and the service life of the cylinder head is prolonged.

The cooling system further includes a flow meter 210, the flow meter 210 being disposed on the liquid inlet line 150 between the first temperature sensor 140 and the filter 200, for detecting the flow rate of the cooling liquid in the liquid inlet line 150 in real time and transmitting the detected flow rate value to the controller 110.

When the flow rate value is lower than the set value, the controller 110 sends a signal to the electric bypass valve 190 to decrease the opening of the electric bypass valve 190, and increases the flow rate of the coolant flowing to the cylinder head; when the flow rate is higher than the set value, the controller 110 sends a signal to the electric bypass valve 190 to increase the opening of the electric bypass valve 190, and decreases the flow rate of the coolant flowing to the cylinder head to finally reach the design value.

In the embodiment, the flow meter 210 and the controller 110 are arranged, so that the opening size of the electric bypass valve 190 can be controlled in real time, the flow rate of the cooling liquid flowing to the cylinder head is accurately controlled, and the cooling effect is ensured.

The cooling system further comprises a second temperature sensor 220, the second temperature sensor 220 is connected with the controller 110 and arranged on the liquid return pipeline 180, so that the temperature of cooling liquid in the liquid return pipeline can be detected in real time through the second temperature sensor 220, the cooling effect of the cooling system can be reflected laterally, the over-high temperature of the fuel injector 20 and the exhaust valve seat ring 40 is prevented, and the service lives of the fuel injector 20 and the exhaust valve seat ring 40 are prolonged.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the present invention, unless otherwise specifically stated, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A cylinder cover is characterized by comprising a cover body with a fuel injector bush hole and an exhaust valve seat ring hole, wherein a fuel injector is arranged in the fuel injector bush hole, an exhaust valve seat ring is arranged in the exhaust valve seat ring hole, and a cooling gap is formed between the exhaust valve seat ring hole and the exhaust valve seat ring;

the cover body is also provided with a liquid inlet, a first channel and a second channel which are respectively communicated with the liquid inlet, and the liquid inlet is used for being connected with an external cooling water tank;

one end of the first channel, which is far away from the liquid inlet, is communicated with the cooling cavity of the oil sprayer, and one end of the second channel, which is far away from the liquid inlet, is communicated with the cooling gap.

2. The cylinder head of claim 1, wherein the first passage includes a first sub-passage and a second sub-passage in communication with the first sub-passage, the second sub-passage being in communication with a cooling cavity of the fuel injector;

the axes of the first and second sub-channels are perpendicular to each other.

3. The cylinder head of claim 2, wherein the second sub-passage includes a first section and a second section connected to the first section, the second section having a diameter smaller than a diameter of the first section.

4. A cylinder head according to any one of claims 1 to 3, characterized in that the cover further includes a liquid outlet, and a third passage and a fourth passage that communicate with the liquid outlet, an end of the third passage that faces away from the liquid outlet communicating with a cooling chamber of the fuel injector, and an end of the fourth passage that faces away from the liquid outlet communicating with the cooling gap.

5. The cylinder head according to any one of claims 1 to 3, wherein the cover body is further provided with a fifth channel, one end of the fifth channel is connected with the liquid inlet, and the other end of the fifth channel is respectively connected with the first channel and the second channel.

6. An engine cooling system, characterized by comprising a cooling water tank and a cylinder head according to any one of claims 1 to 5, wherein a liquid inlet line of the cooling water tank is connected to the liquid inlet, and a liquid return line of the cooling water tank is connected to a liquid outlet of the cylinder head.

7. The engine cooling system according to claim 6, further comprising a controller, a radiator, an electric thermostat valve, and a first temperature sensor, wherein the radiator, the electric thermostat valve, and the first temperature sensor are all disposed on the liquid inlet pipe, and the controller is connected to the electric thermostat valve and the first temperature sensor, respectively;

the first temperature sensor is used for detecting the temperature of cooling liquid in the liquid inlet pipeline and sending the temperature to the controller;

the controller is used for controlling the opening degree of the electric temperature regulating valve according to the temperature.

8. Engine cooling system according to claim 7, characterized in that a water pump is arranged on a liquid inlet line between the cooling water tank and the electric thermo valve.

9. The engine cooling system according to claim 8, further comprising a bypass pipeline, wherein one end of the bypass pipeline is connected to the liquid inlet pipeline between the electric thermostat valve and the first temperature sensor, the other end of the bypass pipeline is connected to the liquid return pipeline, and an electric bypass valve is disposed on the bypass pipeline and connected to a controller.

10. The engine cooling system of claim 9, further comprising a filter, a flow meter, and a second temperature sensor, the flow meter and the second temperature sensor each being connected to the controller;

the filter is arranged on the liquid inlet pipeline and is positioned between the electric temperature regulating valve and the electric bypass valve;

the flowmeter is arranged on the liquid inlet pipeline and is positioned between the first temperature sensor and the filter;

the second temperature sensor is arranged on the liquid return pipeline.

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