Integrated expansion tank, cooling system and automobile

Abstract

The integrated expansion tank includes a tank body (1), in which a coolant flow path (8) is provided through a chamber (2), and at least one set of gas-liquid separation structures is provided in the coolant flow path (8), each set of gas-liquid separation structures includes a first opening (13) provided in the coolant flow path (8) for allowing liquid in the chamber (2) to flow into the coolant flow path (8) and a second opening (14) for allowing liquid in the coolant flow path (8) to flow into the chamber (2), and the pressure in the first opening (13) is greater than the pressure in the second opening (14). A cooling system is further disclosed, including a motor cooling circuit (17), a battery cooling circuit (16), and the expansion tank. A vehicle including the cooling system is further disclosed. The integrated expansion tank ensures efficiency of gas-liquid separation and eliminates abnormal noise by performing separation in two stages. Overall, the degassing time of gas-liquid separation is shortened, heat leakage is reduced, and the temperature difference between the liquid inlet and the liquid outlet is also greatly reduced.

Description

[Technical field]

[0001] The present invention relates to the technical field of expansion tanks, in particular to integrated expansion tanks, cooling systems and automobiles. [Background technology]

[0002] Expansion tanks are used in many industries, especially in the automotive field. Due to the thermal expansion and contraction of water in a heat supply system, when the hot water rises in temperature, the volume of water in the system increases. If there is no place to absorb the expansion of this part of the water, the water pressure in the heat supply system will increase, affecting normal operation. The expansion tank absorbs the water expansion in the system, so it can reduce the water pressure fluctuation caused by the expansion of water in the system and improve the safety and reliability of the system operation. If the system leaks water for some reason or the temperature of the system drops, the water level in the expansion tank will drop and replenish water to the system. In addition to functioning as pressure stabilization and unloading, the expansion tank can also function as a buffer when the pressure changes slightly.

[0003] After the vacuum filling in the production line and the static filling in the service repair, a large amount of air will be present in the entire cooling system. The presence of air will affect the life of the pump, the efficiency of heat dissipation, and will generate abnormal noise, so it is necessary to separate these airs and store them above the liquid surface of the expansion tank. In the prior art, the expansion tank itself does not have a dedicated gas-liquid separation function, and it is common to use an external gas-liquid separator to perform gas-liquid separation. For the gas-liquid separator, it is also common to realize gas-liquid separation by utilizing the buoyancy of the air itself. However, since the liquid entering the separator has a certain flow rate, when the liquid pushes up the air bubbles and makes them rise to the liquid surface, if part of the kinetic energy is not counteracted, they will collide with the liquid surface, which will cause abnormal noise. Especially during degassing at a large flow rate, the flow rate is relatively large, and the abnormal noise caused by the collision will be more obvious. On the other hand, if the kinetic energy of the liquid is too much counteracted by other methods, for example by isolating it into multiple chambers and designing a tortuous flow path between the inlet and outlet, the gas-liquid separation is performed using only the buoyancy of the air, and the separation efficiency is not high. On the other hand, the cooling liquid will remain in the gas-liquid separator for a long time, and excessive heat exchange will occur, making it easy for excessive heat leakage to occur and resulting in a large temperature difference between the liquid at the inlet and outlet. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an integrated expansion tank, a cooling system, and an automobile, which solve the problem that the conventional expansion tank does not have a dedicated gas-liquid separation function, and also solves the problems of low efficiency of the gas-liquid separation process, abnormal noise, and large temperature difference between the inlet and outlet. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention proposes the following technical solution.

[0006] The integrated expansion tank includes a tank body, a chamber used to store liquid is provided within the tank body, the tank body is provided with a liquid inlet and a liquid outlet, and importantly, a cooling liquid flow path is provided within the tank body through the chamber, both ends of the cooling liquid flow path are connected to the liquid inlet and the liquid outlet, respectively, the cooling liquid flow path is provided with at least one set of gas-liquid separation structures, each set of the gas-liquid separation structures includes a first opening provided in the cooling liquid flow path through which liquid from the chamber flows into the cooling liquid flow path, and a second opening through which liquid from the cooling liquid flow path flows into the chamber, the pressure at the first opening is greater than the pressure at the second opening, and when the tank body is operating, the liquid and gas in the cooling liquid flow path flow into the chamber from the second opening, and the liquid in the chamber is replenished into the cooling liquid flow path from the first opening.

[0007] Preferably, the first opening and the second opening of each set of the liquid / gas separating structures are located on the same side of the coolant flow path or on opposite sides of the coolant flow path.

[0008] Preferably, in each set of the gas-liquid separation structures, the first opening and the second opening are arranged opposite each other, or the first opening and the second opening are arranged offset in the flow direction or circumferential direction of the cooling liquid flow path.

[0009] Preferably, the cooling liquid flow path is provided with one or more fluid redirecting sections, the first opening and the second opening are provided in the fluid redirecting section, and when liquid in the cooling liquid flow path flows through the first opening and the second opening, the fluid redirecting section causes the flow velocity of the liquid in the cooling liquid flow path at the second opening to be greater than the flow velocity at the first opening.

[0010] Preferably, the fluid deflection portion is a curved or bent portion, the first opening being located inside the curved or bent portion, and the second opening being located outside the curved or bent portion.

[0011] Preferably, one side surface of the cooling liquid flow passage is recessed inward or protrudes outward to form the fluid deflection portion.

[0012] Preferably, when the tank body is in operation, the first opening and the second opening are located below the liquid level in the chamber.

[0013] Preferably, the vertical distance between the first opening and the second opening and the liquid surface is 5 mm or more.

[0014] Preferably, the cooling liquid flow path includes a liquid introduction portion communicating with the liquid inlet, a liquid discharge portion communicating with the liquid outlet, and a gas-liquid separation portion connected between the liquid introduction portion and the liquid discharge portion, the gas-liquid separation portion being located in a central area of ​​the tank body, and a first opening and a second opening of the gas-liquid separation structure being provided in the gas-liquid separation portion.

[0015] Preferably, the gas-liquid separation section has an end communicating with the liquid discharge section at a mounting height equal to or lower than an end communicating with the liquid introduction section.

[0016] Preferably, the gas-liquid separation section includes a lower flow passage groove and an upper cover plate, a first end face of the upper cover plate is covered by the lower flow passage groove, a second end face of the upper cover plate abuts against the top of the tank body, and a first opening and a second opening of the gas-liquid separation structure are provided in a side wall of the lower flow passage groove.

[0017] Preferably, edges of the first opening and the second opening extend towards and are flush with a first end surface of the upper cover plate.

[0018] Preferably, the edge of the upper cover plate is provided with at least one outwardly extending flow guide portion, the flow guide portion being provided corresponding to the second opening.

[0019] Preferably, a first reinforcing rib is provided on a first end face of the upper cover plate corresponding to an edge of the lower flow path groove, and a second reinforcing rib is provided on a second end face of the upper cover plate extending therefrom and abutting the top of the tank body.

[0020] Preferably, a locking member is provided on an outer side of a side wall of the lower flow channel, and the upper cover plate is locked to the lower flow channel via the locking member.

[0021] Preferably, the tank body includes a lower tank body and an upper tank cover, the lower flow path groove is provided in the lower tank body, a first end face of the upper cover plate is covered by the lower flow path groove, and a second end face of the upper cover plate abuts against the upper tank cover, and when the upper tank cover and the lower tank body are assembled, the upper cover plate and the lower flow path groove are abutted against each other.

[0022] Preferably, the tank body is further provided with a motor liquid refill port, a degassing and liquid inlet port, and a service switch, the degassing and liquid inlet port communicates with a service switch, and the open / closed state of the degassing and liquid inlet port is controlled via the service switch. The motor liquid refill port is located at the bottom of the tank body, and the degassing and liquid inlet port and the service switch are provided at the top of the tank body.

[0023] Preferably, the tank body is further provided with a relief valve and a liquid level sensor.

[0024] Furthermore, importantly, a cooling system is provided, which includes a motor cooling circuit, a battery cooling circuit, and an integrated expansion tank provided by any one of the above technical solutions.

[0025] Furthermore, and importantly, a vehicle is provided that includes a cooling system provided by the above-mentioned technical solution.

[0026] From the above, the integrated expansion tank, cooling system, and automobile according to the present invention have the following beneficial effects.

[0027] The liquid and gas in the cooling liquid flow path flow into the chamber from the second opening, and thus carry the gas in the cooling circuit into the expansion tank. Meanwhile, the liquid in the chamber is replenished into the cooling liquid flow path from the first opening, and thus replenished into the cooling circuit together with the liquid in the expansion tank. This realizes primary separation of gas and liquid without affecting the flow rate of the entire cooling circuit, and ensures the efficiency of gas-liquid separation. Meanwhile, after the gas is drawn out from the cooling liquid flow path into the chamber, secondary separation is further performed by the buoyancy of the gas itself, so that even if the flow rate of the cooling circuit increases, the gas and liquid do not collide with the liquid surface and generate abnormal noise. Overall, the degassing time of gas-liquid separation is shortened, heat leakage is reduced, and the temperature difference between the liquid inlet and liquid outlet of the cooling liquid flow path is also significantly reduced.

[0028] In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, the following will briefly describe the accompanying drawings required for the description of the embodiments or the prior art. It is clear that the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these accompanying drawings without creative labor. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a structural schematic diagram of an integrated expansion tank according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded view of the integral expansion tank according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a structural schematic diagram of a lower tank body of the integrated expansion tank according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an enlarged view of A in FIG. [Diagram 5] 2 is an exploded view of a gas-liquid separation section in the integral expansion tank according to the first embodiment of the present invention. FIG. [Figure 6]FIG. 2 is a perspective view of an upper cover plate in the integrated expansion tank according to the first embodiment of the present invention. [Figure 7] FIG. 11 is a schematic diagram illustrating the principle of a cooling system according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a structural schematic diagram of a gas-liquid separation section in an integral expansion tank according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a structural schematic diagram of a gas-liquid separation section in an integral expansion tank according to a fourth embodiment of the present invention. [Figure 10] FIG. 11 is a structural schematic diagram of a gas-liquid separation section in an integral expansion tank according to a fourth embodiment of the present invention. [Figure 11] FIG. 11 is a structural schematic diagram of a gas-liquid separation section in an integral expansion tank according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] In the following, the embodiments of the present invention will be described using specific concrete examples, but those skilled in the art can easily understand other advantages and functional effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific examples. Each detail in this specification may be modified or changed in various ways based on different perspectives and applications without departing from the gist of the present invention. In addition, the following examples and features in the examples may be combined with each other unless inconsistent. It should also be understood that the terms used in the examples of the present invention are intended to describe specific implementations and are not intended to limit the scope of protection of the present invention. In the following examples, test methods for which specific conditions are not specified are usually performed according to conventional conditions or conditions recommended by each manufacturer.

[0031] 1 to 11, the structures, proportions, sizes, etc. shown in the attached drawings of this specification are merely for the purpose of aligning with the contents disclosed in the specification so that those skilled in the art can understand and read them, and do not limit the limiting conditions under which this application can be implemented, and therefore have no technically substantial meaning, and any modification of the structure, change in proportionality, or adjustment of size shall be within the scope covered by the technical content disclosed in this application as long as it does not affect the effects and objectives achieved by this application. In addition, the terms "upper", "lower", "left", "right", "middle", "one", etc. referred to in this specification are merely for the purpose of clarifying the description, and are not intended to limit the scope of the present invention, and any change or adjustment of the relative relationship shall be considered as within the scope of the present invention as long as it does not substantially change the technical content.

[0032] When a numerical range is given in the examples, it should be understood that the two endpoints of each numerical range and any numerical value between the two endpoints can be used unless otherwise stated in the present invention. Unless otherwise defined, all technical and scientific terms used in the present invention, the understanding of the prior art of a person skilled in the art, and the description of the present invention can be used to realize the present invention using any method, device, and material in the prior art that is similar or equivalent to the method, device, and material described in the examples of the present invention.

[0033] Example 1: 1 and 2, the integrated expansion tank, cooling system and automobile includes a tank body 1, a chamber 2 for storing liquid is provided in the tank body 1, a liquid inlet 1-1 and a liquid outlet 1-2 are provided in the tank body 1, the tank body 1 includes a lower tank body 1a and an upper tank cover 1b, and the shape of the tank body 1 can be designed according to the space in which it is installed and is not limited to the shape of the present application. The tank body 1 is provided with a relief valve 3 and a liquid level sensor 4.

[0034] 1 and 2, the tank body 1 is further provided with a motor liquid refill port 5, a degassing and liquid inlet port 6, and a service switch 7, the degassing and liquid inlet port 6 is connected to the service switch 7, and the open / close state of the degassing and liquid inlet port 6 is controlled via the service switch 7. The motor liquid refill port 5 is located at the bottom of the tank body 1, and the degassing and liquid inlet port 6 and the service switch 7 are provided at the top of the tank body 1. The motor liquid refill port 5 and the degassing and liquid inlet port 6 are connected to the motor cooling circuit 17, and during degassing, the service switch 7 is turned on to operate the pump in the motor cooling circuit 17, automatic degassing is performed, and after completion, the service switch 7 is turned off.

[0035] 2, 3 and 4, a cooling liquid flow path 8 passing through the chamber 2 is provided in the tank body 1, and both ends of the cooling liquid flow path 8 are connected to the liquid inlet 1-1 and the liquid outlet 1-2, respectively. The cooling liquid flow path 8 includes a liquid introduction portion 8a connected to the liquid inlet 1-1, a liquid discharge portion 8c connected to the liquid outlet 1-2, and a gas-liquid separation portion 8b connected between the liquid introduction portion 8a and the liquid discharge portion 8c. Since the attached equipment may tilt during operation, the gas-liquid separation portion 8b is disposed in the central area of ​​the tank body 1 to prevent the gas-liquid separation portion 8b from being exposed above the liquid surface during tilting. The installation height of the end of the gas-liquid separation portion 8b connected to the liquid discharge portion 8c is set to be equal to or lower than the installation height of the end of the gas-liquid separation portion 8b connected to the liquid introduction portion 8a. This makes it easier for gas to condense in the gas-liquid separation portion 8b, making degassing easier.

[0036] 5 and 6, the gas-liquid separation section 8b includes a lower flow passage groove 8-1 and an upper cover plate 8-2, the lower flow passage groove 8-1 is provided in the lower tank body 1a, a first end face of the upper cover plate 8-2 is covered by the lower flow passage groove 8-1, and a second end face of the upper cover plate 8-2 is provided with a second reinforcing rib 10 for increasing strength that extends and abuts against the top of the tank body 1. A first reinforcing rib 9 for increasing strength is provided on the first end face of the upper cover plate 8-2 corresponding to an edge of the lower flow passage groove 8-1, and a locking member 11 is further provided on the outer side of a side wall of the lower flow passage groove 8-1, and the upper cover plate 8-2 is locked to the lower flow passage groove 8-1 via the locking member 11. When the upper tank cover 1b and the lower tank body 1a are assembled, the upper cover plate 8-2 and the lower flow passage groove 8-1 are brought into contact with each other, and are locked and fixed by the locking member 11.

[0037] 3 and 4, the gas-liquid separation section 8b of the cooling liquid flow passage 8 is provided with two fluid redirection sections, and the fluid redirection section 12 is a curved section. A set of the gas-liquid separation structures is provided corresponding to the fluid redirection section 12, and each set of the gas-liquid separation structures includes a first opening 13 through which the liquid in the chamber 2 flows into the cooling liquid flow passage 8, and a second opening 14 through which the liquid in the cooling liquid flow passage 8 flows into the chamber 2, and the first opening 13 and the second opening 14 of the two sets of the gas-liquid separation structures are all formed on the opposite side of the side wall of the lower flow passage groove 8-1, and the edges of the first opening 13 and the second opening 14 extend toward the first end surface of the upper cover plate 8-2 and are flush with the first end surface of the upper cover plate 8-2. Collision of the liquid surface can be avoided. The first opening 13 is located inside the curved section, and the second opening 14 is located outside the curved section.

[0038] In addition, when the proposal of this embodiment is applied to a car or other traveling equipment, which will be tilted irregularly during driving, it is necessary to prevent the kinetic energy of the liquid and gas coming out of the second opening 14 from being suddenly converted into kinetic energy in the vertical direction as much as possible, reduce the vertical flow speed, and prevent abnormal noise caused by the impact of the water flow on the liquid surface, so that a large angle must be maintained between the direction in which the water is discharged from the second opening 14 and the vertical direction. Therefore, when arranged horizontally, it is preferable that the direction in which the water is discharged from the second opening 14 is parallel to the liquid surface and at the same time, the discharge of the water is not hindered.

[0039] 6, the edge of the upper cover plate 8-2 is provided with at least one outwardly extending flow guide portion 18 corresponding to the second opening 14. This extends the flow distance in the direction in which water is discharged from the second opening 14, and prevents a large flow rate of liquid from carrying gas and directly colliding with the liquid surface to generate abnormal noise.

[0040] 2, 3 and 4, when the tank body 1 is in operation, the first opening 13 and the second opening 14 are located below the liquid level in the chamber 2, and the vertical distance between the first opening 13 and the second opening 14 and the liquid level is 5 mm or more, thereby preventing the first opening 13 and the second opening 14 from being exposed from the liquid level when the equipment is tilted. When the liquid in the cooling liquid flow path 8 flows through the first opening 13 and the second opening 14, the flow velocity of the liquid in the cooling liquid flow path 8 at the second opening 14 is higher than that at the first opening 13 by the fluid redirecting unit 12, and the higher the flow velocity, the lower the pressure, and the lower the flow velocity, the higher the pressure, so that the pressure at the first opening 13 is higher than that at the second opening 14. When the tank body 1 is operating, liquid and gas in the cooling liquid flow path 8 flow into the chamber 2 through the second opening 14, and liquid in the chamber 2 is replenished into the cooling liquid flow path 8 through the first opening 13.

[0041] Example 2: Referring to FIG. 7, the cooling system provided by the technical solution of this embodiment includes a motor cooling circuit, a battery cooling circuit, and the expansion tank in the first embodiment.

[0042] In summary, the integrated expansion tank and cooling system provided by the technical solutions of the first and second embodiments has a gas-liquid separation function, and the liquid inlet and liquid outlet of the expansion tank body 1 communicate with the battery cooling circuit 16, and the motor liquid refill port 5 and the degassing and liquid inlet port 6 communicate with the motor cooling circuit 17, so that the motor cooling circuit 17 and the battery cooling circuit 16 share one expansion tank, and one tank can be used instead of two tanks. In addition, there is no need to provide a dedicated gas-liquid separator, and the service switch 7 is also integrated. Overall, the number of expansion tanks and liquid level sensors 4 is reduced, and the number of piping, pipe clips, etc. is also reduced, so the cost and weight of the entire cooling system drops linearly.

[0043] More importantly, in the integrated gas-liquid separation function, the coolant flow path 8 is curved, and the first opening 13 and the second opening 14 are formed on the inner side wall and the outer side wall of the curved position of the coolant flow path 8, respectively. When the fluid passes through the curved position, a difference in flow rate occurs between the area of ​​the first opening 13 and the area of ​​the second opening 14, so that the flow rate in the area of ​​the second opening 14 is greater than the flow rate in the area of ​​the first opening 13, and the pressure near the second opening 14 is less than the pressure near the first opening 13. This allows the liquid in the coolant flow path to carry the gas and flow into the expansion tank through the opening on the outer side wall, and the liquid in the expansion tank to flow into the coolant flow path through the opening on the inner side wall, thereby realizing the primary separation of gas and liquid and ensuring the efficiency of gas-liquid separation. Meanwhile, the secondary separation is performed by the buoyancy of the air itself after the gas-liquid mixture is drawn out from the hole of the flow path, so that even if the flow rate of the cooling circuit is high, the gas-liquid mixture will not collide with the liquid surface to generate abnormal noise. The degassing time for gas-liquid separation is shortened, heat leakage is reduced, and the temperature difference between the liquid inlet 1-1 and the liquid outlet 1-2 is also greatly reduced. The conflicting problems of incomplete degassing due to the large flow rate of the coolant in the expansion tank, or low degassing efficiency due to the small flow rate, and large temperature difference between the inlet and outlet due to heat leakage are thoroughly solved.

[0044] Example 3: 8, this embodiment provides an alternative to the integrated expansion tank based on the embodiment 1, in which the fluid redirecting section 12 may be a bend, the first opening 13 is located inside the bend, and the second opening 14 is located outside the bend, so that a pressure difference is generated between the first opening 13 and the second opening 14, and liquid is discharged through the second opening 14 in the coolant flow passage 8 and liquid is replenished through the first opening 13.

[0045] Example 4: 9 and 10, this embodiment provides an alternative to the integrated expansion tank based on the first embodiment, and the fluid redirecting section 12 may also be formed by one side of the coolant flow passage 8 being inwardly recessed or outwardly protruding. Whether one side of the coolant flow passage 8 is inwardly recessed or outwardly protruding, a change in flow rate can be generated on the inwardly recessed or outwardly protruding side of the fluid redirecting section 12. This creates a pressure difference between the first opening 13 and the second opening 14, and liquid is discharged from the coolant flow passage 8 through the second opening 14 and replenished through the first opening 13.

[0046] Example 5: 11, this embodiment provides an alternative to the integrated expansion tank based on embodiment 1, and the fluid redirecting portion 12 may also be asymmetrically inwardly concave or outwardly convex on the opposite side, so as to form different flow rates on the opposite side, thereby forming a pressure difference between the first opening 13 and the second opening 14, so that the liquid is discharged through the second opening 14 in the coolant flow passage 8 and the liquid is replenished through the first opening 13.

[0047] Example 6: The technical solution of this embodiment provides an automobile equipped with the cooling system described in the above embodiment 2.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those skilled in the art may modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary skill in the art to which this application pertains without departing from the spirit and technical ideas disclosed in the present invention are still intended to be encompassed within the scope of the claims of the present invention. [Explanation of symbols]

[0049] 1 Tank body 1-1 Liquid inlet 1-2 Liquid outlet 1a Lower tank body 1b Upper tank cover 2 Chamber 3. Relief valve 4 Liquid level sensor 5 Motor Fluid Refill Port 6 Degassing and liquid inlet 7 Service Switch 8 Coolant flow path 8a Liquid introduction part 8b Gas-liquid separation section 8c Liquid drain 8-1 Lower flow channel 8-2 Top cover plate 9 First reinforcing rib 10 Second reinforcing rib 11 Locking member 12 Fluid deflection section 13 First Opening 14 Second Opening 15 Battery cooling circuit 16 Motor cooling circuit 17 Direction section

Claims

1. An integrated expansion tank comprising a tank body, the tank body having a chamber for containing a liquid, the tank body having a liquid inlet and a liquid outlet, A coolant flow path is provided in the tank body through the chamber, the cooling liquid passage has two ends communicating with the liquid inlet and the liquid outlet, At least one set of gas-liquid separation structures is provided in the cooling liquid flow path, Each set of the gas-liquid separation structures includes a first opening provided in a cooling liquid flow path and used for liquid in a chamber to flow into the cooling liquid flow path, and a second opening used for liquid in the cooling liquid flow path to flow into the chamber; When the pressure at the first opening is greater than the pressure at the second opening and the tank body is in operation, the liquid and gas in the cooling liquid flow path flow into the chamber from the second opening, and the liquid in the chamber is replenished into the cooling liquid flow path from the first opening. An integral expansion tank.

2. The first opening and the second opening of each set of the gas-liquid separation structures are located on the same side of the cooling liquid flow path or on opposite sides of the cooling liquid flow path.

2. The integral expansion tank according to claim 1 .

3. In each set of the gas-liquid separation structures, The first opening and the second opening are provided opposite to each other, or The first opening and the second opening are provided so as to be shifted from each other in a flow direction or a circumferential direction of the cooling liquid flow path.

2. The integral expansion tank according to claim 1 .

4. The cooling liquid flow path is provided with one or more fluid redirecting sections, the first opening and the second opening are provided in the fluid redirecting section, and when liquid in the cooling liquid flow path flows through the first opening and the second opening, the fluid redirecting section causes the flow velocity of the liquid in the cooling liquid flow path at the second opening to be greater than the flow velocity at the first opening.

2. The integral expansion tank according to claim 1 .

5. The fluid redirecting portion is a curved portion or a bent portion, the first opening is located inside the curved portion or the bent portion, and the second opening is located outside the curved portion or the bent portion.

5. The integral expansion tank according to claim 4.

6. One side of the cooling liquid flow passage is recessed inward or protruded outward to form the fluid deflection portion.

5. The integral expansion tank according to claim 4.

7. When the tank body is in operation, the first opening and the second opening are located below the liquid level in the chamber.

2. The integral expansion tank according to claim 1 .

8. The vertical distance between the first opening and the second opening and the liquid surface is 5 mm or more.

8. The integral expansion tank according to claim 7.

9. the cooling liquid flow path includes a liquid introduction portion communicating with the liquid inlet, a liquid discharge portion communicating with the liquid outlet, and a gas-liquid separation portion connected between the liquid introduction portion and the liquid discharge portion, The gas-liquid separation section is located in a central area of ​​the tank body, and the first opening and the second opening of the gas-liquid separation structure are provided in the gas-liquid separation section.

9. An integral expansion tank according to claim 1 ,

10. The gas-liquid separation section has an end communicating with the liquid discharge section at a mounting height equal to or lower than an end communicating with the liquid introduction section.

10. The integral expansion tank according to claim 9.

11. The gas-liquid separation section includes a lower flow passage groove and an upper cover plate, a first end surface of the upper cover plate is covered by the lower flow passage groove, a second end surface of the upper cover plate is in contact with the top of the tank body, and the first opening and the second opening of the gas-liquid separation structure are provided in a side wall of the lower flow passage groove.

10. The integral expansion tank according to claim 9.

12. The edges of the first opening and the second opening extend toward and are flush with the first end surface of the upper cover plate.

12. The integral expansion tank according to claim 11.

13. At least one outwardly extending flow guide portion is provided on an edge portion of the upper cover plate, the flow guide portion being provided corresponding to the second opening.

12. The integral expansion tank according to claim 11.

14. A first reinforcing rib is provided on a first end surface of the upper cover plate in correspondence with an edge of the lower flow channel, and a second reinforcing rib is provided on a second end surface of the upper cover plate, extending to abut against a top of the tank body.

12. The integral expansion tank according to claim 11.

15. A locking member is provided on the outer side of the side wall of the lower flow channel, and the upper cover plate is locked to the lower flow channel via the locking member.

12. The integral expansion tank according to claim 11.

16. The tank body includes a lower tank body and an upper tank cover, the lower flow passage groove is provided in the lower tank body, a first end surface of the upper cover plate is covered by the lower flow passage groove, and a second end surface of the upper cover plate abuts against the upper tank cover, and when the upper tank cover and the lower tank body are assembled, the upper cover plate abuts against the lower flow passage groove.

12. The integral expansion tank according to claim 11.

17. The tank body is further provided with a motor liquid refill port, a degassing and liquid inlet port, and a service switch; The degassing and liquid inlet is connected to a service switch, and the open / close state of the degassing and liquid inlet is controlled via the service switch. The motor liquid refill port is located at the bottom of the tank body, and the degassing and liquid inlet and the service switch are provided at the top of the tank body.

9. An integral expansion tank according to claim 1 ,

18. The tank body is further provided with a relief valve and a liquid level sensor.

9. An integral expansion tank according to claim 1 ,

19. A motor cooling circuit, a battery cooling circuit, and an expansion tank according to any one of claims 1 to 18. A cooling system comprising:

20. The cooling system of claim 19. A vehicle characterized by:

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