CN213743639U - Engine cooling system, engine and vehicle - Google Patents

Abstract

The utility model provides an engine cooling system, engine and vehicle, wherein, engine cooling system includes circulating line, oil cooler and puts the water pipe way, put the water pipe way with oil cooler's coolant liquid pipeline parallel access circulating line, it is equipped with the valve that drains to put the water pipe way. The utility model provides an engine cooling system, engine and vehicle set up the current setting near the water valve that drains in the water jacket of cylinder body near oil cooler, just can provide installation space for the installation of the valve that drains, more do benefit to operating personnel and operate the valve that drains.

Description

Engine cooling system, engine and vehicle

Technical Field

The utility model relates to an engine cooling system field especially relates to engine cooling system, engine and vehicle.

Background

The automobile cooling system has the function of timely dissipating partial heat absorbed by heated parts, and the engine is ensured to work in an optimum temperature state. Among them, a cooling system using air as a cooling medium is called an air cooling system; a water cooling system using cooling liquid as a cooling medium.

In the cooling system, the pressure of the coolant is increased by a water pump, so that the coolant is forced to flow in a circulating pipeline of the engine in a circulating mode. The cooling system mainly comprises a water pump, a radiator, a cooling fan, a compensation water tank, a thermostat, a water jacket in an engine body and a cylinder cover, an accessory device and the like. In addition, the circulating pipeline is communicated with a water discharge pipe. The cooling liquid in the circulating pipeline is discharged through a water discharging pipe.

The existing drain pipe is communicated with a water jacket of a cylinder body of an engine, and the drain pipe is provided with a drain valve so that an operator can control the on-off of the drain pipe. However, the installation space reserved for the drain valve at the cylinder of the existing engine is small, which causes difficulty in installing the drain valve.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an engine cooling system, engine and vehicle for the cylinder body department of solving current engine is little for the installation space that the valve reserved that drains, leads to the problem of the valve installation difficulty that drains.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an aspect of the embodiment of the utility model provides an engine cooling system, include circulation pipeline, oil cooler and drainage pipeline, drainage pipeline with oil cooler's coolant liquid pipeline parallel connection inserts circulation pipeline, drainage pipeline is equipped with the valve that drains.

In one possible implementation manner, the diameter of the water discharge pipe is smaller than that of the circulation pipeline.

In one possible implementation manner, the water discharge pipeline is further provided with a water retaining valve, and the water retaining valve and the water discharge valve are arranged in a linkage manner.

In one possible implementation manner, the water drain pipeline includes a first branch and a second branch, and two ends of the first branch are respectively connected to the water outlet end of the oil cooler and the water drain valve; one end of the second branch is communicated with the water outlet end of the engine oil cooler and the first branch between the water drain valves, and the other end of the second branch is communicated with the water inlet end of the engine oil cooler.

In one possible implementation manner, the water blocking valve is arranged on the first branch between the water outlet end of the oil cooler and the second branch.

In one possible implementation, the water check valve includes: the water outlet is arranged towards the water drain valve; a closure member movable relative to the housing and adapted to controllably close the outlet; the elastic resetting piece is connected with the blocking piece and the shell, and the elastic resetting piece is used for keeping the blocking piece at the position for blocking the water inlet.

In one possible implementation manner, the housing is cylindrical, and the blocking piece is slidably disposed on the housing along an axial direction of the housing.

In one possible implementation manner, the blocking piece is arranged coaxially with the water inlet, and includes a first section and a second section, wherein the diameter of the first section is larger than that of the water inlet so as to block the water inlet; the second section slides relative to the housing.

In one possible implementation manner, the elastic restoring member is sleeved outside the second section and located between the first section and the housing.

In one possible implementation manner, a positioning column is arranged inside the housing, the positioning column is provided with a central hole, the second section is opposite to the inner wall of the central hole and slides, and the elastic resetting piece is sleeved on the outer side of the positioning column.

An engine comprising a block and an engine cooling system as described in any one of the above, the circulation line being provided to the block.

A vehicle comprises a vehicle body and an engine as described above.

The utility model provides an engine cooling system, engine and vehicle, coolant liquid pipeline through will putting water pipeline and oil cooler connects in parallel into circulation line to make originally set up the valve that drains near the organism cylinder body water jacket of engine, set up near oil cooler. The oil cooler sets up the lower extreme at the engine, just so can provide installation space for the installation of the valve that drains, more does benefit to operating personnel and operates the valve that drains.

In addition to the technical problems, technical features constituting technical aspects, and advantageous effects brought by the technical features of the technical aspects described above, other technical problems, technical features included in technical aspects, and advantageous effects brought by the technical features that can be solved by the embodiments of the present invention will be described in further detail in the detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a prior art engine cooling system cycle;

fig. 2 is a schematic cycle diagram of an engine cooling system according to an embodiment of the present invention;

FIG. 3 is a schematic cycle diagram of another engine cooling system provided by an embodiment of the present invention;

fig. 4 is a cross-sectional view of a partial drain line according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of the discharge valve of fig. 4.

Description of reference numerals:

1-a circulation line;

2-an engine oil cooler;

3-water discharging pipeline; 31-a first branch; 32-a second branch;

4-a water drain valve;

5-a water retaining valve;

51-a housing; 511-water inlet; 512-water outlet; 513-a ring wall; 514-bottom wall;

52-a closure;

53-elastic return member;

6-positioning columns;

7-a water pump;

8-a water tank;

9-a seal;

101. a circulation loop;

102. a water pump;

103. a cylinder body;

104. a water discharge pipeline;

105. a water drain valve.

With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Fig. 1 is a schematic diagram of a conventional engine cooling system, and as shown in fig. 1, the automotive engine cooling system is a forced circulation water cooling system, that is, a water pump 102 is used to increase the pressure of coolant so that the coolant circulates in the engine and exchanges heat with heat inside the engine to maintain the temperature of the engine at a certain working temperature (typically 80 ℃ -90 ℃). A water discharge pipe 104 is connected to a water jacket of a cylinder 103 of the engine, and the coolant in the circulation circuit 101 is discharged through the water discharge pipe 104. The water discharge pipeline 104 is provided with a water discharge valve 105 so that an operator can control the on-off of the water discharge pipeline 104.

However, since the present engine requires a tightly coupled design, i.e. the connection between the parts of the engine is tight, the installation space of the engine reserved for the water discharge valve 105 at the position of the cylinder 103 is small, and the water discharge valve 105 is difficult to install.

In view of the above, since the oil cooler is located at the lower end of the engine, the present application provides a proper installation space for the drain valve by communicating the water outlet end of the drain pipe with the water outlet end of the oil cooler and disposing the drain valve near the oil cooler.

Fig. 2 is a schematic diagram of a cycle of an engine cooling system according to an embodiment of the present invention, as shown in fig. 2, the engine cooling system includes a circulation pipeline 1, an oil cooler 2 and a water discharge pipeline 3, the water discharge pipeline 3 is connected in parallel with a coolant pipeline of the oil cooler 2 to the circulation pipeline 1, and the water discharge pipeline 3 is provided with a water discharge valve 4.

That is, the oil coolant and the drain 3 share one water inlet end and one water outlet end. So that the drain valve 4, which is originally provided near the cylinder, is provided near the oil cooler 2. The oil cooler 2 is arranged at the lower end of the engine, so that an installation space can be provided for installing the water drain valve 4, and the operation of the water drain valve 4 by an operator is facilitated.

It should be noted that the engine cooling system includes a radiator, a cooling fan, a thermostat, and a fluid replacement tank, in addition to components such as a water tank, a water pump 8, and a valve. The engine body is provided with a water channel (water tank), and the cylinder cover is provided with a water jacket and other additional devices. The above components are connected together by water pipes to form a closed circulation line 1. The circulation line 1 includes a small circulation and a large circulation. The small circulation is a process in which when the temperature of the cooling water or the cooling liquid is lower than a predetermined value (generally, about 80 ℃), the circulating water or the cooling liquid does not pass through the radiator under the control of the thermostat. That is, water or cooling liquid directly enters the water inlet of the water pump 8 through the thermostat and then is sent into the water jacket of the cylinder 7 through the water pump 8. Since water or coolant does not pass through the radiator, the engine temperature can be rapidly increased.

In addition, the large circulation is that when the temperature of water or coolant exceeds a predetermined value (generally about 90 ℃), the main valve of the thermostat is opened, the sub-valve is closed, and all of the circulating water or coolant passes through the radiator. The cooling water or cooling liquid after heat dissipation is pumped by the water pump 8 to return to the water jacket of the cylinder block 7, and then flows into the radiator through the water jacket of the cylinder block 7. The water or coolant flow path is long, and the cooling intensity is high, so the circulation is called as large circulation.

It is noted that lubricating oil (engine oil) plays an important role in engine operation, providing the necessary lubrication, sealing, cleaning, corrosion protection, and cooling for the engine. For engine oil, temperature is the most important factor influencing the working state of the engine oil, and for some high-power and high-heat engines, the viscosity of the engine oil is reduced due to excessively high temperature, so that an oil film is damaged, the lubricating performance is reduced, the running resistance of the engine is increased, the power output is influenced, and the engine is abraded. The temperature of the lubricating oil needs to be kept at a reasonable temperature (generally 90-120 ℃) so as to ensure proper viscosity.

The oil cooler 2 is a device for maintaining the temperature of the lubricating oil. The oil cooler 2 includes an oil line for flowing lubricating oil and a coolant line for flowing coolant. The oil pipeline is connected between the oil filter and the main oil duct in series, and the cooling liquid pipeline is communicated with a circulating pipeline 1 of an engine cooling system. The oil pipeline and the cooling liquid pipeline inside the oil cooler 2 carry out heat convection so as to control the temperature of the lubricating oil within an ideal range.

In which the oil cooler 2 in fig. 2 is arranged in the circulation line 1, and the arrows in fig. 2 indicate the direction of flow of the cooling liquid. As shown in fig. 2, the coolant in the circulation line 1 is partially introduced into the oil cooler 2 and partially introduced into the drain line 3 by the water pump 8. Since the drain valve 4 is closed when the water is not discharged, the coolant entering the drain pipe 3 flows out from the water outlet end of the drain pipe 3 and is mixed with the coolant flowing out of the oil coolant. A part of the coolant does not enter the oil cooler 2 at all times during the circulation of the coolant. Therefore, in order to improve the efficiency of the cooling system, the diameter of the water discharge pipe 3 may be reduced or a water stop valve may be provided.

Illustratively, the diameter of the drain pipe is smaller than the diameter of the circulation line, so that the amount of water entering the oil cooler per unit time is larger than the amount of water entering the drain pipe.

Fig. 3 is a schematic diagram of another cycle of an engine cooling system according to an embodiment of the present invention, as shown in fig. 3, the water discharge pipe 3 is further provided with a water blocking valve 5, and when the water discharge valve 4 is closed, the water blocking valve 5 is closed to block the coolant from flowing in the water discharge pipe 3 and to enable the coolant to circulate in the circulation pipe 1 and the coolant pipe. When the water drain valve 4 is opened, the water blocking valve 5 is opened, so that the cooling liquid flows out from the water outlet end of the water drain valve 4.

That is to say, through the water retaining valve that sets up and the linkage of drain valve for when the drain valve was closed, the water retaining valve also links and closes, thereby prevents that the coolant liquid from flowing into the circulating line through the drain pipe, avoids not directly getting into the circulating line from the drain pipe through the coolant liquid of oil cooler, just so can make the volume of the coolant liquid of effectively carrying out the heat exchange increase, does benefit to the cooling efficiency who improves oil cooler. In addition, when the drain valve is opened, the water retaining valve is correspondingly linked to be opened, so that the cooling liquid in the circulating pipeline and the engine oil cooler is discharged from the drain valve of the drain pipe, and the discharge of the cooling liquid is facilitated.

The water blocking valve 5 is opened in conjunction with the opening of the water drain valve 4, and may be designed by using a pressure difference between the inside and the outside of the circulation line 1 when the water drain valve 4 is opened. The structure of the water check valve 5 will be described below on this principle.

Fig. 4 is a cross-sectional view of a part of the water discharge pipeline according to an embodiment of the present invention, as shown in fig. 4, the water discharge pipeline 3 may include a first branch 31 and a second branch 32. Wherein, two ends of the first branch 31 are respectively connected with the water outlet end of the cooling liquid pipeline of the oil cooler 2 and the water drain valve 4. The water check valve 5 is disposed at the first branch 31, and its one end near the oil cooler 2 is disposed. The two ends of the second branch 32 are respectively connected with the first branch 31 and the water inlet end of the cooling liquid pipeline of the engine oil cooler 2. The second branch 32 communicates with a position between the water stop valve 5 and the water discharge valve 4 so that the water stop valve 5 can block the coolant in the first branch 31 from flowing into the second branch 32.

The water stop valve 5 and the drain valve 4 are both provided in the first branch passage 31. Optionally, the water blocking valve 5 is arranged opposite to the water drain valve 4, so that a path for water coming out from a water outlet end of machine oil cooling liquid to reach the water drain valve 4 can be reduced, and the water blocking valve 5 can be opened quickly when the water drain valve 4 is opened.

In addition, the first branch 31 is generally connected to a water jacket of a cylinder block of the engine, and is made of a soft material and has a certain radian, which is inconvenient for installing the water check valve 5. The water stop valve 5 is generally disposed on the second branch 32, and the second branch 32 is generally linearly disposed. Not only can realize opening fast of manger plate valve 5, also can make things convenient for the installation of manger plate valve 5.

Fig. 5 is a sectional view of the discharge valve 4 of fig. 4, and as shown in fig. 4 and 5, the water blocking valve 5 may include a housing 51, a blocking member 52, and an elastic restoring member 53. Wherein, the shell 51 can be embedded in the water discharge pipeline 3, one end of the shell 51 is provided with a water inlet 511, the other end of the shell 51 is provided with a water outlet 512, and the water outlet 512 is arranged towards the water discharge valve 4. The blocking piece 52 is inserted into the housing 51 and is movable relative to the housing 51, and the blocking piece 52 is used for blocking the water inlet 511.

In addition, the elastic restoring member 53 is connected to the blocking member 52 and the housing 51, and the elastic restoring member 53 is used for keeping the blocking member 52 blocking the water inlet 511

When the coolant is circulated through the circulation line 1, that is, when the water is not discharged, the water inlet 511 is blocked by the blocking piece 52, the water outlet 512 of the water stop valve 5 is separated from the circulation line 1, and the water discharge line 3 is prevented from communicating with the circulation line 1. When water is discharged, the blocking piece 52 can be far away from the water outlet 512, so that the water outlet 512 of the water blocking valve 5 can be communicated with the circulation pipeline 1, and further, the cooling liquid in the circulation pipeline 1 and the engine oil cooler 2 flows out of the water discharging valve 4 through the water outlet 512 of the water blocking valve 5.

Furthermore, when the coolant circulates in the circulation line 1, the elastic restoring member 53 acts on the blocking member 52, so that the blocking member 52 keeps blocking the water inlet 511. When discharging water, the elastic restoring member 53 applies a restoring force to the block piece 52 smaller than the air pressure inside and outside the water discharge pipe 3, so that the block piece 52 is separated from the water inlet 511.

The manner in which the blocking piece 52 is used to block the water inlet 511 may include, but is not limited to, the following possible implementation manners:

in one possible implementation, as shown in fig. 5, the blocking piece 52 is arranged coaxially with the water inlet 511, and the cross-sectional diameter of the blocking piece 52 near the water inlet 511 is larger than that of the water inlet 511.

Alternatively, the movement of the blocking member 52 relative to the housing 51 may be sliding. Illustratively, the blocking piece 52 is slidably provided to the housing 51 in the axial direction of the discharge pipe 3. That is, the elastic restoring member 53 applies a restoring force to the block piece 52 in the axial direction of the discharge pipe 3. When the axis of the discharge conduit 3 is a straight line as shown in fig. 5, the movement locus of the block piece 52 is a straight line so that the plug simplifies the movement of the block piece 52.

Since the plugging member 52 is required to move linearly, the movement path of the plugging member 52 needs to be planned to avoid the situation that the plugging member 52 shakes left and right during the movement process. When the vertical section of the blocking piece 52 can be rectangular, the two ends of the blocking piece 52 can slide relative to the inner wall of the shell 51, so as to ensure the consistency of the movement of the two ends of the blocking piece 52; when the block piece 52 is arranged as shown in fig. 5, that is, the vertical section of the block piece 52 is T-shaped, the sliding with respect to the housing 51 can be achieved by the small-diameter end of the block piece 52. Illustratively, the blanking member 52 includes a first section and a second section. The diameter of the cross section of the first section is larger than that of the water inlet 511, and the first section is used for blocking the water inlet 511. The second section can be inserted through the bottom wall 514 of the housing 51. That is, the bottom wall 514 defines a central aperture and the second section is slidably disposed within the central aperture. Wherein the first section and the second section can be integrally arranged. Of course, the shape of the blocking piece 52 and the way in which the blocking piece 52 slides relative to the housing 51 are various, and the shape is only illustrative and not limited.

Next, it should be noted that the first section of the blocking piece 52 mentioned above may be disposed inside the outer shell 51 as shown in fig. 5, and may also be disposed outside the outer shell 51. When the first section of the blocking piece 52 is arranged inside the housing 51, as shown in fig. 5, the side of the first section away from the second section abuts against the inner side of the water inlet 511, that is, the blocking piece 52 blocks the water inlet 511 upwards in fig. 5; when the first end of the block piece 52 is disposed outside the housing 51, the side where the first section and the second section are connected abuts against the outside of the water inlet 511, that is, the block piece 52 blocks the water inlet 511 downward.

Alternatively, the movement of the blocking member 52 relative to the housing 51 may be a rotational arrangement. Illustratively, one end of the blocking piece 52 is hinged to one side of the water inlet 511, and the other end of the blocking piece 52 is realized by means of an elastic resetting piece 53 to block the water inlet 511 and be far away from the water inlet 511. Wherein the elastic restoring member 53 may be a linear spring so as to apply a restoring force to the blocking member 52 in the axial direction of the discharge pipe 3; the elastic restoring member 53 may also be a torsion spring so as to apply a rotational force to the blocking member 52.

It should be noted that the movement of the blocking member 52 relative to the housing 51 may be in other forms as long as the blocking member 52 can block the water inlet 511 and be away from the water inlet 511 under the action of the elastic restoring member 53 and the pressure difference between the inside and the outside of the pipeline.

In addition, in another possible implementation manner of the blocking piece 52 for blocking the water inlet 511, one end of the blocking piece 52 may be embedded in the water inlet 511. That is, the cross-sectional area of the block piece 52 is smaller than that of the water inlet 511. A sealing member 9 may be provided between the blocking member 52 and the inner wall of the water inlet hole to seal the blocking member 52 with the water inlet 511 to prevent the coolant from flowing through the gap between the blocking member 52 and the water inlet 511. The sealing member 9 includes, but is not limited to, a sealing ring and a gasket.

It should be noted that, the arrangement of the blocking member 52 and the movement of the blocking member 52 relative to the housing 51 can be found above, and are not described herein again.

The specific arrangement of the components of the water stop valve 5 will be described below by taking the arrangement of the blocking piece 52 in fig. 5, that is, the blocking piece 52 is arranged inside the housing 51, the blocking piece 52 includes a first section and a second section, the first section of the blocking piece 52 is used for blocking the lower side of the water inlet 511, and the second section of the blocking piece 52 is slidably arranged on the housing 51.

The arrangement of the housing 51 is described below:

as shown in fig. 5, in order to install the water blocking valve 5 into the discharge pipe 3, that is, to install the housing 51 of the water blocking valve 5 into the discharge pipe 3, the housing 51 may be provided with a certain elasticity so as to be snap-fastened to the discharge pipe 3. So, the water blocking valve 5 can be detachably connected to the water discharge pipeline 3, so that the water blocking valve 5 can be conveniently overhauled and maintained.

Further, a seal ring is provided between the housing 51 and the inner wall of the discharge pipe 3 so that the coolant does not flow out through a gap between the housing 51 and the discharge pipe 3.

Alternatively, since the elastic restoring member 53 and the blocking member 52 are disposed inside the housing 51, the housing 51 may include a first portion and a second portion independent from each other to facilitate the mounting and dismounting of the elastic restoring member 53 and the blocking member 52. The connection mode between the first part and the second part includes but is not limited to clamping connection, threaded connection and other detachable connections.

Illustratively, as shown in FIG. 5, the first portion includes an annular wall 513 and the second portion includes a bottom wall 514. A first end of the circumferential wall 513 has an inlet 511 and a second end of the circumferential wall 513 is connected to the bottom wall 514. The annular wall 513 is connected to the outer periphery of the bottom wall 514 and extends toward the circulation pipeline 1, and the annular wall 513 and the bottom wall 514 form an accommodating space. The elastic restoring piece 53 and the blocking piece 52 are arranged in the accommodating space.

The elastic restoring member 53 will be described below.

As shown in fig. 5, the elastic restoring member 53 is sleeved outside the second segment and located between the first segment and the bottom wall 514 of the housing 51. That is, the axis of the elastic restoring member 53 is parallel to or coincides with the axis of the second segment. The second segment not only serves to mount the elastic restoring member 53, but also serves to restrict the elastic restoring member 53 from moving in the radial direction.

Optionally, the bottom wall 514 of the housing 51 is provided with a positioning column 6, the elastic restoring member 53 is sleeved on the positioning column 6, and the second section is inserted through the positioning column 6. Wherein the second section can pass through the setting post 6. The positioning post 6 not only can increase the length for limiting the sliding of the second section, but also can further reduce the range of the elastic reset piece 53 moving along the radial direction.

It should be noted that the water blocking valve 5 may be disposed near the water inlet end of the water discharge pipeline 3, or may be disposed near the water outlet end of the water discharge pipeline 3.

The terms "upper" and "lower" are used to describe relative positions of the structures in the drawings, and are not used to limit the scope of the present invention, and the relative relationship between the structures may be changed or adjusted without substantial technical changes.

It should be noted that: in the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Furthermore, in the present disclosure, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 disclosure. In this specification, the schematic representations of the terms used above 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.

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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (12)

1. An engine cooling system is characterized by comprising a circulating pipeline, an engine oil cooler and a water discharging pipeline, wherein the water discharging pipeline and a cooling liquid pipeline of the engine oil cooler are connected into the circulating pipeline in parallel, and a water discharging valve is arranged on the water discharging pipeline.

2. The engine cooling system of claim 1, wherein the diameter of the water discharge pipe is smaller than the diameter of the circulation line.

3. The engine cooling system according to any one of claims 1-2, wherein the water discharge pipeline is further provided with a water retaining valve, and the water retaining valve is linked with the water discharge valve.

4. The engine cooling system according to claim 3, wherein the water discharge pipeline comprises a first branch and a second branch, and two ends of the first branch are respectively connected with a water outlet end of the oil cooler and the water discharge valve; one end of the second branch is communicated with the water outlet end of the engine oil cooler and the first branch between the water drain valves, and the other end of the second branch is communicated with the water inlet end of the engine oil cooler.

5. The engine cooling system of claim 4, wherein the water check valve is disposed on the first branch between the water outlet end of the oil cooler and the second branch.

6. The engine cooling system of claim 3, wherein the water check valve comprises:

the water outlet is arranged towards the water drain valve;

a closure member movable relative to the housing and adapted to controllably close the outlet;

the elastic resetting piece is connected with the blocking piece and the shell, and the elastic resetting piece is used for keeping the blocking piece at the position for blocking the water inlet.

7. The engine cooling system according to claim 6, wherein the housing is cylindrical, and the block piece is slidably provided in the housing in an axial direction of the housing.

8. Engine cooling system according to claim 7, characterized in that the blocking piece is arranged coaxially with the water inlet and comprises a first section and a second section, the first section having a diameter larger than the diameter of the water inlet for blocking the water inlet; the second section slides relative to the housing.

9. The engine cooling system of claim 8, wherein the resilient return member is disposed outside the second segment and between the first segment and the housing.

10. The engine cooling system of claim 9, wherein a positioning post is disposed inside the housing, the positioning post has a central hole, the second section slides relative to an inner wall of the central hole, and the elastic return member is sleeved outside the positioning post.

11. An engine comprising a block and an engine cooling system as claimed in any one of claims 1 to 10, said circulation line being provided to said block.

12. A vehicle characterized by comprising a vehicle body and the engine of claim 11.

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