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, and in particular to integrated expansion tanks, cooling systems and motor vehicles. [Background technology]

[0002] Expansion tanks are used in many industries, especially the automotive industry. Due to the thermal expansion and contraction of water in heat supply systems, when the hot water heats up, the volume of the water in the system increases. Without a suitable space to absorb this expansion, the water pressure in the heat supply system increases, affecting normal operation. Expansion tanks absorb the water expansion, reducing the water pressure fluctuations caused by water expansion within the system and improving the safety and reliability of system operation. If the system experiences a water leak or a drop in temperature, the water level in the expansion tank drops, replenishing the system. In addition to stabilizing and unloading pressure, expansion tanks can also act as a buffer against slight pressure changes.

[0003] After vacuum filling on the production line and static filling during service repairs, a large amount of air remains in the entire cooling system. The presence of air can affect the pump's lifespan, heat dissipation efficiency, and noise. Therefore, it is necessary to separate the air and store it above the liquid surface in the expansion tank. In conventional technologies, the expansion tank itself does not have a dedicated gas-liquid separation function, and gas-liquid separation is typically performed using an external gas-liquid separator. Gas-liquid separators also typically achieve gas-liquid separation by utilizing the buoyancy of the air itself. However, because the liquid entering the separator has a certain flow velocity, when the liquid pushes the air bubbles up to the liquid surface, some of the kinetic energy must be counteracted, causing noise. The noise caused by the collision is particularly pronounced during high-flow degassing, where the flow velocity is relatively high. On the other hand, if the kinetic energy of the liquid is too much canceled out by other methods, for example, if the design involves isolating the liquid into multiple chambers and tortuously winding the 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 remains in the gas-liquid separator for a long time, and excessive heat exchange occurs, which makes it easy for excessive heat leakage to occur and results 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 drawbacks of the prior art, the object of the present invention is to provide an integrated expansion tank, a cooling system, and a vehicle that solves the problem of the conventional expansion tank not having a dedicated gas-liquid separation function, and also solves the problems of low efficiency in 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 for storing a liquid provided within the tank body, a liquid inlet and a liquid outlet provided within the tank body, and importantly, a coolant flow path through the chamber provided within the tank body, both ends of which are connected to the liquid inlet and the liquid outlet, respectively, and at least one set of gas-liquid separation structures provided in the coolant flow path, each set of gas-liquid separation structures including a first opening provided in the coolant flow path and used for liquid from the chamber to flow into the coolant flow path, and a second opening through which liquid from the coolant flow path flows into the chamber, and when the pressure at the first opening is greater than the pressure at the second opening, the liquid and gas in the coolant flow path flow into the chamber through the second opening, and the liquid in the chamber is replenished into the coolant flow path through the first opening.

[0007] Preferably, the first opening and the second opening of each set of the gas-liquid 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 redirection sections, the first opening and the second opening are provided in the fluid redirection sections, and when the liquid in the cooling liquid flow path flows through the first opening and the second opening, the fluid redirection sections make the flow velocity of the liquid in the cooling liquid flow path at the second opening greater than the flow velocity at the first opening.

[0010] Preferably, the fluid deflecting 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.

[0011] Preferably, one side surface of the cooling liquid flow path is recessed inward or protruded 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 the central area of ​​the tank body, and the first opening and the second opening of the gas-liquid separation structure being provided in the gas-liquid separation portion.

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

[0016] Preferably, the gas-liquid separation section includes a lower flow channel and an upper cover plate, a first end face of the upper cover plate is covered by the lower flow channel, 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 channel.

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

[0019] Preferably, a first reinforcing rib is provided on a first end surface of the upper cover plate corresponding to the 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 the top of the tank body.

[0020] Preferably, a locking member is provided on the 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 surface of the upper cover plate is covered by the lower flow path 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 path groove.

[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 being connected to the service switch, and the open / closed states of the degassing and liquid inlet port are 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 located 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, and 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 motor vehicle is provided that includes a cooling system provided by the above-described 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 coolant flow path flow into the chamber through the second opening, carrying the gas from the cooling circuit into the expansion tank. Meanwhile, the liquid in the chamber is replenished into the coolant flow path through the first opening, replenishing it with the liquid from the expansion tank into the cooling circuit. This ensures primary gas-liquid separation without affecting the flow rate of the entire cooling circuit, ensuring efficient gas-liquid separation. Furthermore, because secondary separation occurs due to the buoyancy of the gas itself after the gas is drawn from the coolant flow path into the chamber, even when the flow rate of the cooling circuit increases, the gas and liquid do not collide with the liquid surface, causing noise. Overall, this shortens the degassing time for gas-liquid separation, reduces heat leakage, and significantly reduces the temperature difference between the liquid inlet and liquid outlet of the coolant flow path.

[0028] In order to more clearly describe the embodiments of the present invention or the technical solutions in 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 work. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a structural schematic diagram of an integral expansion tank according to a first embodiment of the present invention. [Figure 2] 1 is an exploded view of an integral expansion tank according to a first embodiment of the present invention. [Figure 3] 1 is a structural schematic diagram of a lower tank body of an integrated expansion tank according to a first embodiment of the present invention. FIG. [Figure 4] FIG. 4 is an enlarged view of A in FIG. [Figure 5] 1 is an exploded view of a gas-liquid separator in an integral expansion tank according to a first embodiment of the present invention. [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. 10 is a principle schematic diagram of a cooling system according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a structural schematic diagram of a gas-liquid separator in an integral expansion tank according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a structural schematic diagram of a gas-liquid separator in an integral expansion tank according to a fourth embodiment of the present invention. [Figure 10] FIG. 10 is a structural schematic diagram of a gas-liquid separator in an integral expansion tank according to a fourth embodiment of the present invention. [Figure 11] FIG. 10 is a structural schematic diagram of a gas-liquid separator in an integral expansion tank according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, embodiments of the present invention will be described using specific examples. However, those skilled in the art will easily understand other advantages and functional effects of the present invention from the contents disclosed herein. The present invention can also be implemented or applied through different specific examples. Various modifications or changes may be made to the details in this specification based on different perspectives and applications without departing from the gist of the present invention. 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 generally follow conventional conditions or conditions recommended by each manufacturer.

[0031] 1 to 11, the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are merely for the purpose of facilitating understanding and viewing by persons skilled in the art and are not intended to limit the conditions under which the present application can be implemented, and therefore have no substantial technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size are considered to be within the scope of the technical content disclosed in this application, as long as they do not affect the effects and objectives of the present application. In addition, the terms "upper," "lower," "left," "right," "middle," "one," etc. used in this specification are merely used to clarify the description and are not intended to limit the scope of the present invention. Any changes or adjustments in their relative relationships should be considered within the scope of the present invention, as long as they do not substantially change the technical content.

[0032] When a range of values ​​is given in the examples, it should be understood that the two endpoints of each range and any value between the two endpoints can be used unless otherwise specified in the present invention. Unless otherwise defined, all technical and scientific terms used in the present invention, the understanding of those skilled in the art in the prior art, and the description of the present invention can be used to realize the present invention using any methods, devices, and materials in the prior art that are similar or equivalent to the methods, devices, and materials described in the examples of the present invention.

[0033] Example 1: 1 and 2, the integrated expansion tank, cooling system, and automobile include a tank body 1, a chamber 2 for storing liquid provided within the tank body 1, a liquid inlet 1-1 and a liquid outlet 1-2 provided within the tank body 1, and a lower tank body 1a and an upper tank cover 1b. The shape of the tank body 1 can be designed according to the installation space 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 located 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, automatically performing degassing, and once complete, the service switch 7 is turned off.

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

[0036] 5 and 6, the gas-liquid separation unit 8b includes a lower flow channel 8-1 and an upper cover plate 8-2, the lower flow channel 8-1 is provided in the lower tank body 1a, a first end surface of the upper cover plate 8-2 is covered by the lower flow channel 8-1, and a second end surface 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 surface of the upper cover plate 8-2 corresponding to an edge of the lower flow channel 8-1, and a locking member 11 is further provided on the outer side of the side wall of the lower flow channel 8-1, and the upper cover plate 8-2 is locked to the lower flow channel 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 coolant flow path 8 has two fluid redirection sections, and the fluid redirection sections 12 are curved sections. A pair of the gas-liquid separation structures is provided corresponding to the fluid redirection section 12. Each pair of the gas-liquid separation structures includes a first opening 13 through which the liquid in the chamber 2 flows into the coolant flow path 8 and a second opening 14 through which the liquid in the coolant flow path 8 flows into the chamber 2. The first opening 13 and the second opening 14 of the two pairs of the gas-liquid separation structures are formed on opposite sides of the sidewall of the lower flow path groove 8-1. The edges of the first opening 13 and the second opening 14 extend toward and are flush with the first end surface of the upper cover plate 8-2. This prevents collision of liquid surfaces. The first opening 13 is located inside the curved section, and the second opening 14 is located outside the curved section.

[0038] Furthermore, when this embodiment is applied to a car or other traveling equipment, which may tilt irregularly during operation, it is necessary to maintain a large angle between the direction in which water is discharged from second opening 14 and the vertical direction in order to prevent the kinetic energy of the liquid and gas coming out of second opening 14 from being suddenly converted into kinetic energy in the vertical direction, reduce the vertical flow velocity, and prevent abnormal noise caused by the impact of the water flow on the liquid surface. Therefore, when the device is placed horizontally, it is desirable that the direction in which water is discharged from second opening 14 be parallel to the liquid surface and that the discharge of water is not obstructed.

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

[0040] 2, 3, and 4, when the tank body 1 is operating, 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 above the liquid level when the equipment is tilted. When the liquid in the coolant flow path 8 flows through the first opening 13 and the second opening 14, the fluid redirection unit 12 causes the flow velocity of the liquid in the coolant flow path 8 at the second opening 14 to be greater than the flow velocity at the first opening 13. The greater the flow velocity, the lower the pressure, and the lower the flow velocity, the higher the pressure. Therefore, the pressure at the first opening 13 is greater than the pressure at the second opening 14. When the tank body 1 is operating, the liquid and gas in the coolant flow path 8 flow into the chamber 2 through the second opening 14, and the liquid in the chamber 2 is replenished into the coolant 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 Examples 1 and 2 has both gas-liquid separation functionality and, since 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 degassing and liquid inlet port 6 communicate with the motor cooling circuit 17, a single expansion tank can be shared by the motor cooling circuit 17 and the battery cooling circuit 16, allowing for the use of a single tank instead of two. Furthermore, a dedicated gas-liquid separator is not required, and the service switch 7 is integrated. Overall, the number of expansion tanks and liquid level sensors 4 is reduced, as well as the number of piping, pipe clips, etc., resulting in a linear reduction in the cost and weight of the entire cooling system.

[0043] More importantly, the integrated gas-liquid separation function utilizes a curved design for the coolant flow path 8, with a first opening 13 and a second opening 14 formed on the inner and outer side walls of the curved portion of the coolant flow path 8, respectively. When the fluid passes through the curved portion, a difference in flow velocity occurs between the area of ​​the first opening 13 and the area of ​​the second opening 14. The flow velocity in the area of ​​the second opening 14 is greater than that in the area of ​​the first opening 13, and the pressure near the second opening 14 is lower than that 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 in the outer side wall, and the liquid in the expansion tank to flow into the coolant flow path through the opening in the inner side wall, achieving primary gas-liquid separation and ensuring efficient gas-liquid separation. Meanwhile, secondary separation occurs due to the buoyancy of the air itself after the gas-liquid mixture is drawn out of the flow path holes. Therefore, even if the flow velocity in the cooling circuit is high, the gas-liquid mixture will not collide with the liquid surface and 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 significantly reduced. This thoroughly solves the contradictory problems such as incomplete degassing due to a high flow rate of the coolant in the expansion tank, or low degassing efficiency due to a low flow rate, and a large temperature difference between the inlet and outlet due to heat leakage.

[0044] Example 3: 8, this embodiment provides an alternative to the integrated expansion tank according to the first embodiment, in which the fluid redirecting section 12 may be a bent section, with the first opening 13 located inside the bent section and the second opening 14 located outside the bent section, so that a pressure difference is generated between the first opening 13 and the second opening 14, causing the liquid to be discharged through the second opening 14 in the coolant flow path 8 and 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 portion 12 may also be formed by one side of the coolant flow path 8 being concave inward or convex outward. Whether one side of the coolant flow path 8 is concave inward or convex outward, a change in flow rate can be generated on the inwardly concave side or the outwardly convex side of the fluid redirecting portion 12. As a result, a pressure difference is generated between the first opening 13 and the second opening 14 in the coolant flow path 8, and liquid is discharged 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 according to the first embodiment, and the fluid redirecting section 12 may also be asymmetrically concave inward or convex outward on the opposite side, similarly creating different flow rates on the opposite side. This creates a pressure difference between the first opening 13 and the second opening 14, causing the coolant flow path 8 to discharge liquid through the second opening 14 and replenish liquid through the first opening 13.

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

[0048] The above-described 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-described embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept 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 chambers 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 inlet 8b Gas-liquid separation section 8c Liquid drain 8-1 Lower flow channel 8-2 Upper 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. 1. An integrated expansion tank comprising a tank body, a chamber for containing a liquid provided within the tank body, and a liquid inlet and a liquid outlet provided in the tank body, a coolant flow path through the chamber is provided within the tank body; the cooling liquid flow path has opposite ends communicating with the liquid inlet and the liquid outlet, respectively; At least one gas-liquid separation structure is provided in the coolant flow path; each set of the gas-liquid separation structures includes a first opening provided in a coolant flow path and used for allowing liquid in the chamber to flow into the coolant flow path, and a second opening used for allowing liquid in the coolant 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 operating, the liquid and gas in the cooling liquid flow path flow into the chamber through the second opening, and the liquid in the chamber is replenished into the cooling liquid flow path through the first opening; The cooling liquid flow path is provided with one or more fluid redirection units, the first opening and the second opening are provided in the fluid redirection units, and when the liquid in the cooling liquid flow path flows through the first opening and the second opening, the fluid redirection units cause 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. An integrated 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 coolant flow path or on opposite sides of the coolant flow path.

2. The integral expansion tank according to claim 1.

3. In each set of the gas-liquid separation structure, 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 offset from each other in the flow direction or the circumferential direction of the coolant flow path.

2. The integral expansion tank according to claim 1.

4. 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.

2. The integral expansion tank according to claim 1.

5. One side of the coolant flow path is recessed inward or protruded outward to form the fluid deflection portion.

2. The integral expansion tank according to claim 1.

6. 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.

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

7. The one-piece expansion tank according to claim 6.

8. 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 unit 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 unit.

2. The integral expansion tank according to claim 1.

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

9. The one-piece expansion tank according to claim 8.

10. The gas-liquid separation unit includes a lower flow channel and an upper cover plate, a first end surface of the upper cover plate is covered by the lower flow channel, 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 channel.

9. The one-piece expansion tank according to claim 8.

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

11. The one-piece expansion tank according to claim 10.

12. At least one flow guide portion extending outward is provided on an edge portion of the upper cover plate, and the flow guide portion is provided corresponding to the second opening.

11. The one-piece expansion tank according to claim 10.

13. A first reinforcing rib is provided on a first end surface of the upper cover plate in correspondence with the 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 the top of the tank body.

11. The one-piece expansion tank according to claim 10.

14. 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.

11. The one-piece expansion tank according to claim 10.

15. The tank body includes a lower tank body and an upper tank cover, the lower flow channel is provided in the lower tank body, a first end surface of the upper cover plate is covered by the lower flow channel, 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 channel.

11. The one-piece expansion tank according to claim 10.

16. 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.

2. The integral expansion tank according to claim 1.

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

2. The integral expansion tank according to claim 1.

18. A motor cooling circuit, a battery cooling circuit, and an expansion tank according to any one of claims 1 to 17. A cooling system characterized by:

19. 19. A cooling system comprising: A vehicle characterized by:

Images