Expansion water tank and vehicle

Abstract

The expansion water tank comprises a liquid storage structure, an overflow pipe, a first pressure valve and a second pressure valve, the liquid storage structure is provided with a high-temperature expansion cavity and a low-temperature expansion cavity which are independently arranged, the low-temperature expansion cavity is provided with an exhaust port communicated with the outside, the high-temperature expansion cavity is communicated with an engine cooling circulation pipeline, and the first pressure valve is communicated with the second pressure valve. The low-temperature expansion cavity is communicated with a motor system cooling circulation pipeline; an overflow pipe is respectively communicated with the high-temperature expansion cavity and the low-temperature expansion cavity; the first pressure valve is arranged on the overflow pipe; and the second pressure valve is arranged in the exhaust port. The utility model provides an expansion water tank and a vehicle and aims to solve the problem that in the prior art, cooling liquid is prone to outflow due to abnormal loop pressure of an expansion water tank for cooling an engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle cooling systems, and more specifically, relates to an expansion water tank and a vehicle. Background Art

[0002] The main function of the expansion tank is to provide coolant storage, expansion space, degassing, and easy filling of coolant for the cooling system. When the low-temperature water radiator or high-temperature water radiator heats up during system operation, the coolant capacity inside the water radiator increases, and a part of high-temperature and high-pressure gas-liquid mixture is generated. These gas-liquid mixtures enter the expansion tank through their respective joints and pipelines, and partially condense after encountering the lower temperature tank body and internal reinforcement plate, and return to the liquid state to continue to participate in the coolant circulation. The engine water pump is connected to the expansion tank through a pipeline, and gas-liquid exchange is also carried out to ensure the normal operation of the cooling system.

[0003] The traditional closed expansion tank is a separate cavity, corresponding to a separate coolant circulation system. Hybrid vehicles and new energy vehicles have added generator cooling, battery pack cooling, reducer cooling, etc. Since the engine cooling circuit has a large temperature rise range, when there are problems such as vehicle cooling system failure, insufficient heat dissipation margin under extreme conditions, abnormal internal pressure of the engine body, or insufficient expansion space margin of the expansion tank, the circuit pressure will be abnormal, causing the coolant level to rise abnormally and be discharged from the overflow valve. In addition, if the vehicle shakes during driving, the expansion tank may tilt excessively or continue to vibrate, causing the coolant to be discharged from the overflow valve. No matter which of the above situations occurs, it will cause coolant loss, which not only causes other components in the front cabin to be contaminated, but also causes waste due to frequent coolant replenishment. Utility Model Content

[0004] The utility model aims to provide an expansion water tank and a vehicle, aiming to solve the problem in the prior art that the expansion water tank for engine cooling is prone to outflow of coolant due to abnormal circuit pressure.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] In a first aspect, an expansion water tank is provided, comprising:

[0007] The liquid storage structure has a high-temperature expansion chamber and a low-temperature expansion chamber which are independently arranged, the low-temperature expansion chamber is provided with an exhaust port which is connected to the outside, the high-temperature expansion chamber is connected to the engine cooling circulation pipeline, and the low-temperature expansion chamber is connected to the motor system cooling circulation pipeline;

[0008] An overflow pipe, connected to the high-temperature expansion chamber and the low-temperature expansion chamber respectively;

[0009] A first pressure valve, disposed on the overflow pipe; and

[0010] The second pressure valve is arranged in the exhaust port.

[0011] In combination with the first aspect, in a possible implementation, the liquid storage structure includes a high-temperature expansion tank and a low-temperature expansion tank, the inner cavity of the high-temperature expansion tank forms the high-temperature expansion chamber, and the inner cavity of the low-temperature expansion tank forms the low-temperature expansion chamber.

[0012] In combination with the first aspect, in a possible implementation, the liquid storage structure includes an expansion box body, and a partition plate arranged in the expansion box body, and the partition plate divides the inner cavity of the expansion box body into the high-temperature expansion chamber and the low-temperature expansion chamber along the left-right direction or the front-back direction.

[0013] In combination with the first aspect, in a possible implementation, the liquid storage structure also includes a separation plate, and the separation plate and the partition plate together separate the inner cavity of the expansion box to form the high-temperature expansion chamber, the low-temperature expansion chamber and the battery expansion chamber which are independent of each other, and the battery expansion chamber is connected to the battery cooling circulation pipeline.

[0014] In combination with the first aspect, in a possible implementation, a first opening connecting the high-temperature expansion chamber with the outside and a second opening connecting the low-temperature expansion chamber with the outside are opened on the top of the liquid storage structure, and the liquid storage structure also includes a first pressure cover covering the first opening and a second pressure cover covering the second opening, one end of the overflow pipe is inserted in the first pressure cover, and the other end is inserted in the low-temperature expansion chamber.

[0015] In combination with the first aspect, in a possible implementation, the expansion water tank also includes a first liquid level detector provided in the high-temperature expansion chamber, a second liquid level detector provided in the low-temperature expansion chamber, and a controller, and the first liquid level detector, the second liquid level detector, the first pressure valve and the second pressure valve are respectively communicatively connected to the liquid level detectors.

[0016] In combination with the first aspect, in a possible implementation, the expansion water tank also includes a mounting structure connected to the liquid storage structure, the mounting structure includes a mounting bracket and a fixing bracket, the mounting bracket is fixed to the front cabin along the up and down direction, and the fixing bracket is fixed to the front cabin along the front and back direction and / or the left and right direction.

[0017] In combination with the first aspect, in a possible implementation, the mounting bracket includes a mounting plate and two reinforcing plates respectively arranged on both sides of the mounting plate, the mounting plate and the two reinforcing plates form a "U"-shaped structure, and the mounting plate and the two reinforcing plates are both connected to the liquid storage structure, and a mounting hole is opened on the mounting plate, and the axis of the mounting hole is parallel to the up and down direction.

[0018] In combination with the first aspect, in a possible implementation, the fixed bracket includes a fixed plate and two reinforcement plates respectively arranged on both sides of the fixed plate, the fixed plate and the two reinforcement plates form a "U"-shaped structure, and the fixed plate and the two reinforcement plates are both connected to the liquid storage structure, a fixing hole is opened on the fixed plate, and the axis of the fixing hole is parallel to the left-right direction or the front-back direction.

[0019] The expansion water tank provided by the utility model has the beneficial effect that: compared with the prior art, the expansion water tank of the utility model adopts an overflow pipe to connect the high-temperature expansion chamber with the low-temperature expansion chamber. When the temperature of the coolant in the high-temperature expansion chamber increases, the coolant vaporizes to increase the pressure in the high-temperature expansion chamber, or the pressure in the engine cooling circulation pipeline increases abnormally. When the pressure in the high-temperature expansion chamber is higher than the first preset pressure, the first pressure valve opens, and the coolant in the high-temperature expansion chamber enters the low-temperature expansion chamber along the overflow pipe. At the same time, the gas in the high-temperature expansion chamber also enters the low-temperature expansion chamber along the overflow pipe, resulting in an increase in the pressure in the low-temperature expansion chamber. When the pressure in the low-temperature expansion chamber is higher than the second preset pressure, the second pressure valve opens, and the gas is discharged from the low-temperature expansion chamber. When the pressure in the low-temperature expansion chamber is lower than the third preset pressure, the second pressure valve is closed. After the temperature of the coolant in the high-temperature expansion chamber decreases, the vaporized coolant liquefies into liquid due to the temperature drop, or the pressure in the engine cooling circulation pipeline is restored, and the pressure in the high-temperature expansion chamber decreases. At this time, the pressure in the low-temperature expansion chamber is greater than the pressure in the high-temperature expansion chamber. Under the action of air pressure, the coolant in the low-temperature expansion chamber flows back to the high-temperature expansion chamber along the overflow pipe until the pressure in the high-temperature expansion chamber is the same as that in the low-temperature expansion chamber. The utility model avoids the problem of coolant overflowing when the temperature in the high-temperature expansion chamber rises or the pressure in the engine cooling circulation pipeline increases. The low-temperature expansion chamber temporarily stores the coolant overflowing the high-temperature expansion chamber, thereby reducing the waste of coolant and avoiding the problem of contamination of the front engine room caused by the outflow of coolant.

[0020] In a second aspect, an embodiment of the utility model further provides a vehicle, comprising an expansion water tank as described in any one of the above items.

[0021] The beneficial effect of the vehicle provided by the utility model is that, compared with the prior art, the vehicle of the utility model adopts the above-mentioned expansion water tank, and has similar technical effects as the above-mentioned expansion water tank, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an expansion water tank provided in an embodiment of the utility model;

[0024] Figure 2 Another structural schematic diagram of the expansion water tank provided by the embodiment of the utility model;

[0025] Figure 3 A cross-sectional view of an expansion water tank provided in an embodiment of the utility model.

[0026] In the figure: 1. liquid storage structure; 101. expansion box; 102. partition plate; 103. separation plate; 104. high-temperature expansion chamber; 105. low-temperature expansion chamber; 106. battery expansion chamber; 2. overflow pipe; 3. mounting bracket; 301. mounting plate; 302. reinforcement plate; 303. mounting hole; 4. fixing bracket; 401. fixing plate; 402. reinforcement plate; 403. fixing hole; 5. first pressure cover; 6. second pressure cover; 7. first liquid level detector; 8. second liquid level detector; 9. reflux pipe. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In the claims, specification and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, rather than to describe a specific order. The directional terms "upper" and "lower" in the claims, specification and drawings of the present utility model are the same as the up and down direction of the vehicle body, the terms "left" and "right" are the same as the left and right direction of the vehicle body, the terms "front" and "rear" are the same as the front and rear direction of the vehicle body, and the term "inside" is the side adjacent to the passenger compartment in the left and right direction of the vehicle body, and vice versa. "outside". Unless otherwise specified, other directional words, such as "vertical", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so it cannot be understood as limiting the specific protection scope of the present utility model. In the claims, specification and the above drawings of the present utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements. In the claims, specification and the above drawings of the present utility model, if the terms "including", "having" and their variations are used, it is intended to mean "including but not limited to".

[0029] Please also read Figures 1 to 3 The expansion water tank and the vehicle provided by the utility model are now described. The expansion water tank includes a liquid storage structure 1, an overflow pipe 2, a first pressure valve and a second pressure valve. The liquid storage structure 1 has a high-temperature expansion chamber 104 and a low-temperature expansion chamber 105 that are independently arranged. The low-temperature expansion chamber 105 is provided with an exhaust port that is connected to the outside. The high-temperature expansion chamber 104 is connected to the engine cooling circulation pipeline, and the low-temperature expansion chamber 105 is connected to the motor system cooling circulation pipeline; the overflow pipe 2 is respectively connected to the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105; the first pressure valve is arranged in the overflow pipe 2; and the second pressure valve is arranged in the exhaust port.

[0030] Compared with the prior art, the expansion water tank provided by the utility model adopts an overflow pipe 2 to connect the high-temperature expansion chamber 104 with the low-temperature expansion chamber 105. When the temperature of the coolant in the high-temperature expansion chamber 104 increases, the coolant vaporizes to increase the pressure in the high-temperature expansion chamber 104, or the pressure in the engine cooling circulation pipeline increases abnormally. When the pressure in the high-temperature expansion chamber 104 is higher than the first preset pressure, the first pressure valve opens, and the coolant in the high-temperature expansion chamber 104 enters the low-temperature expansion chamber 105 along the overflow pipe 2. At the same time, the gas in the high-temperature expansion chamber 104 also enters the low-temperature expansion chamber 105 along the overflow pipe 2, resulting in an increase in the pressure in the low-temperature expansion chamber 105. When the pressure in the low-temperature expansion chamber 105 is higher than the second preset pressure, the second pressure valve opens, and the gas is discharged from the low-temperature expansion chamber 105. When the pressure in the low-temperature expansion chamber 105 is lower than the third preset pressure, the second pressure valve closes. After the temperature of the coolant in the high-temperature expansion chamber 104 decreases, the vaporized coolant liquefies into liquid due to the temperature drop, or the pressure of the engine cooling circulation pipeline is restored, and the pressure in the high-temperature expansion chamber 104 decreases. At this time, the pressure in the low-temperature expansion chamber 105 is greater than the pressure in the high-temperature expansion chamber 104. Under the action of air pressure, the coolant in the low-temperature expansion chamber 105 flows back to the high-temperature expansion chamber 104 along the overflow pipe 2 until the pressure in the high-temperature expansion chamber 104 is the same as that in the low-temperature expansion chamber 105. The utility model avoids the problem of coolant overflowing when the temperature in the high-temperature expansion chamber 104 increases. The low-temperature expansion chamber 105 temporarily stores the coolant overflowing from the high-temperature expansion chamber 104, thereby reducing the waste of coolant and avoiding the problem of contamination of the front engine room caused by the outflow of coolant.

[0031] Specifically, a warning liquid level line is provided in the low-temperature expansion chamber 105 , and the end of the overflow pipe 2 is located below the warning liquid level line, or is flush with the warning liquid level line.

[0032] It should be noted that after the engine temperature rises, the coolant in the engine cooling circulation pipeline increases in temperature after heat exchange with the engine, and then enters the high-temperature expansion chamber 104, causing the temperature in the high-temperature expansion chamber 104 to rise and the coolant to vaporize.

[0033] Optionally, a water return pipe is provided at the bottom of the liquid storage structure 1, and the water return pipe connects the high-temperature expansion chamber 104 with the motor cooling circulation pipeline, and connects the low-temperature expansion chamber 105 with the motor system cooling circulation pipeline.

[0034] Optionally, the first pressure valve and the second pressure valve may be pressure relief valves or safety valves.

[0035] Principle of pressure relief valve: When the pressure in the pipeline is greater than the set pressure of the pressure relief valve, the oil will flow out of the pressure relief valve, thereby controlling the pressure in the pipeline not to exceed a certain limit. For example, the needle pressure relief valve adjusts the clamping force by adjusting the length of the spring force in the valve. When the pressure in the pipeline is higher than the set value, the spring is reversely pressed, so that the sealing ejector pin opens and the oil leaks out, which protects the equipment and regulates the system pressure.

[0036] In some embodiments, see Figures 1 to 3 The liquid storage structure 1 includes a high-temperature expansion tank and a low-temperature expansion tank. The inner cavity of the high-temperature expansion tank forms a high-temperature expansion chamber 104, and the inner cavity of the low-temperature expansion tank forms a low-temperature expansion chamber 105.

[0037] In this embodiment, a high-temperature expansion tank and a low-temperature expansion tank are respectively provided. The high-temperature expansion tank and the low-temperature expansion tank can be provided close to each other or distributed at intervals. They are reasonably distributed according to the space and position in the front cabin, and the layout is more spiritual.

[0038] In some embodiments, see Figures 1 to 3 The liquid storage structure 1 includes an expansion box 101 and a partition plate 102 arranged in the expansion box 101. The partition plate 102 divides the inner cavity of the expansion box 101 into a high-temperature expansion chamber 104 and a low-temperature expansion chamber 105 along the left-right direction or the front-back direction.

[0039] Because the optimal operating temperatures required by various components to be cooled are different, different components need to be equipped with corresponding cooling pipes, and each must operate independently of each other, resulting in multiple expansion water tanks in the front engine room of the vehicle. The excessive number of expansion water tanks occupies a large amount of space in the front engine room, affecting the layout of other components. In this embodiment, the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 are integrated into the expansion tank body 101, and the isolation is achieved through the partition plate 102. Compared with the solution of setting two expansion water tanks, the overall volume is reduced, which is conducive to the reasonable layout of the components in the front engine room.

[0040] Optionally, the partition plate 102 is a heat insulating component to reduce heat exchange between the coolant in the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 .

[0041] In some embodiments, see Figures 1 to 3 The liquid storage structure 1 also includes a separation plate 103. The separation plate 103 and the partition plate 102 together separate the inner cavity of the expansion box 101 to form a mutually independent high-temperature expansion chamber 104, a low-temperature expansion chamber 105 and a battery expansion chamber 106. The battery expansion chamber 106 is connected to the battery cooling circulation pipeline.

[0042] For hybrid vehicles, a battery cooling circulation pipeline is also required to cool the battery to ensure the normal operation of the battery, so a battery expansion chamber 106 is required. In this embodiment, the battery expansion chamber 106, the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 are integrated into the expansion box 101, which reduces the overall volume and is conducive to the reasonable layout of the components in the front cabin.

[0043] Optionally, the separation plate 103 is a heat insulation member. The battery expansion chamber 106 may be adjacent to the high-temperature expansion chamber 104 or the low-temperature expansion chamber 105 .

[0044] In some embodiments, see Figures 1 to 3 A first opening is provided at the top of the liquid storage structure 1 to connect the high-temperature expansion chamber 104 with the outside, and a second opening is provided to connect the low-temperature expansion chamber 105 with the outside. The liquid storage structure 1 also includes a first pressure cover 5 to cover the first opening and a second pressure cover 6 to cover the second opening. One end of the overflow pipe 2 is inserted into the first pressure cover 5, and the other end is inserted into the low-temperature expansion chamber 105.

[0045] The first opening and the second opening are respectively provided on the liquid storage structure 1, so that the structures in the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 can be conveniently observed when the cooling system is repaired, and the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 can also be cleaned. In this embodiment, the first pressure cap 5 and the second pressure cap 6 can ensure the sealing of the high-temperature expansion chamber 104 and the low-temperature expansion chamber 105 when the cooling system is used normally, and prevent the coolant from flowing out. The overflow pipe 2 is respectively inserted into the first pressure cap 5 and the low-temperature expansion chamber 105, so that the installation is more convenient, and the plug-in holes are provided on the first pressure cap 5 and the second pressure cap 6, so that the processing is more convenient.

[0046] Optionally, the first pressure cap 5 and the second pressure cap 6 are respectively threadedly connected to the liquid storage structure 1 .

[0047] Optionally, the first pressure cap 5 and the second pressure cap 6 are equipped with different pressure relief capabilities. When the engine cooling cycle management pressure is abnormal, causing the liquid level in the high-temperature expansion chamber 104 to rise, when the liquid level exceeds the capacity limit of the high-temperature expansion chamber 104, the first pressure valve opens, and the coolant overflow pipe 2 enters the low-temperature expansion chamber 105. The pressure in the low-temperature expansion chamber 105 increases, and the second pressure valve opens.

[0048] In some embodiments, see Figures 1 to 3 The expansion water tank also includes a first liquid level detector 7 arranged in the high-temperature expansion chamber 104 and a second liquid level detector 8 arranged in the low-temperature expansion chamber 105, as well as a controller. The first liquid level detector 7, the second liquid level detector 8, the first pressure valve and the second pressure valve are respectively connected to the liquid level detectors for communication.

[0049] When the first liquid level detector 7 detects that the pressure in the high-temperature expansion chamber 104 is higher than the first preset liquid level, an overflow signal is generated, and the controller controls the first pressure valve to open according to the overflow signal, and the coolant in the high-temperature expansion chamber 104 enters the low-temperature expansion chamber 105 along the overflow pipe 2. When the first liquid level detector 7 detects that the pressure in the high-temperature expansion chamber 104 is lower than the second preset liquid level, a reflux signal is generated, and the controller controls the first pressure valve to open according to the reflux signal, and the coolant in the low-temperature expansion chamber 105 flows back to the high-temperature expansion chamber 104 under pressure. When the second liquid level detector 8 detects that the liquid level in the low-temperature expansion chamber 105 is lower than the third liquid level, a refill signal is generated, and the controller sends an alarm to the in-vehicle display system according to the refill signal.

[0050] It should be noted that when the liquid level in the high-temperature expansion chamber 104 is between the first preset liquid level and the second preset liquid level, the controller closes the first pressure valve.

[0051] In some embodiments, see Figures 1 to 3 The expansion water tank also includes a mounting structure connected to the liquid storage structure 1, and the mounting structure includes a mounting bracket 3 and a fixing bracket 4. The mounting bracket 3 is fixed to the front cabin along the up-down direction, and the fixing bracket 4 is fixed to the front cabin along the front-back direction and / or the left-right direction.

[0052] In this embodiment, the liquid storage structure 1 is fixed in the front cabin along the up and down direction by the installation bracket 3, and the liquid storage structure 1 is fixed to the front cabin along the up and down direction or the left and right direction by the fixing bracket 4. By fixing and limiting the liquid storage structure 1 in at least two directions, the firmness and stability of the liquid storage structure 1 after installation are improved.

[0053] In some embodiments, see Figures 1 to 3 The mounting bracket 3 includes a mounting plate 301 and two reinforcing plates 302 respectively arranged on both sides of the mounting plate 301, the mounting plate 301 and the two reinforcing plates 302 form a "U"-shaped structure, and the mounting plate 301 and the two reinforcing plates 302 are both connected to the liquid storage structure 1, and a mounting hole 303 is opened on the mounting plate 301, and the axis of the mounting hole 303 is parallel to the up and down direction.

[0054] Compared with the solution of only setting the mounting plate 301 to connect with the liquid storage structure 1, the solution in this embodiment increases the strength of the mounting bracket 3, increases the contact area with the liquid storage structure 1, and improves the connection stability with the liquid storage structure 1. The mounting hole 303 is adapted to the through hole in the front cabin, and the fixing is achieved by inserting the bolts into the mounting hole 303 and the corresponding through hole.

[0055] In some embodiments, see Figures 1 to 3The fixed bracket 4 includes a fixed plate 401 and two reinforcement plates 402 respectively arranged on both sides of the fixed plate 401, the fixed plate 401 and the two reinforcement plates 402 form a "U"-shaped structure, and the fixed plate 401 and the two reinforcement plates 402 are both connected to the liquid storage structure 1, and a fixing hole 403 is opened on the fixed plate 401, and the axis of the fixing hole 403 is parallel to the left-right direction or the front-back direction.

[0056] Compared with the solution of only setting the fixing plate 401 to connect with the liquid storage structure 1, the solution in this embodiment increases the strength of the fixing bracket 4, increases the contact area with the liquid storage structure 1, and improves the connection stability with the liquid storage structure 1. The fixing hole 403 is adapted to the through hole in the front cabin, and the fixing is achieved by inserting the bolts into the fixing hole 403 and the corresponding through hole.

[0057] Based on the same inventive concept, the utility model also provides a vehicle, which comprises any one of the above expansion water tanks.

[0058] The vehicle provided by the utility model adopts the above-mentioned expansion water tank, and uses the overflow pipe 2 to connect the high-temperature expansion chamber 104 with the low-temperature expansion chamber 105. When the temperature of the coolant in the high-temperature expansion chamber 104 increases, the coolant vaporizes to increase the pressure in the high-temperature expansion chamber 104, or the pressure in the engine cooling circulation pipeline increases abnormally. When the pressure in the high-temperature expansion chamber 104 is higher than the first preset pressure, the first pressure valve opens, and the coolant in the high-temperature expansion chamber 104 enters the low-temperature expansion chamber 105 along the overflow pipe 2. At the same time, the gas in the high-temperature expansion chamber 104 also enters the low-temperature expansion chamber 105 along the overflow pipe 2, resulting in an increase in the pressure in the low-temperature expansion chamber 105. When the pressure in the low-temperature expansion chamber 105 is higher than the second preset pressure, the second pressure valve opens, and the gas is discharged from the low-temperature expansion chamber 105. When the pressure in the low-temperature expansion chamber 105 is lower than the third preset pressure, the second pressure valve closes. After the temperature of the coolant in the high-temperature expansion chamber 104 decreases, the vaporized coolant liquefies into liquid due to the temperature drop, or the pressure of the engine cooling circulation pipeline is restored, and the pressure in the high-temperature expansion chamber 104 decreases. At this time, the pressure in the low-temperature expansion chamber 105 is greater than the pressure in the high-temperature expansion chamber 104. Under the action of air pressure, the coolant in the low-temperature expansion chamber 105 flows back to the high-temperature expansion chamber 104 along the overflow pipe 2 until the pressure in the high-temperature expansion chamber 104 is the same as that in the low-temperature expansion chamber 105. The utility model avoids the problem of coolant overflowing when the temperature in the high-temperature expansion chamber 104 increases. The low-temperature expansion chamber 105 temporarily stores the coolant overflowing from the high-temperature expansion chamber 104, thereby reducing the waste of coolant and avoiding the problem of contamination of the front engine room caused by the outflow of coolant.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Expansion water tank, characterized in that: include: The liquid storage structure (1) comprises a high-temperature expansion chamber (104) and a low-temperature expansion chamber (105) which are independently arranged, the low-temperature expansion chamber (105) is provided with an exhaust port which is connected to the outside, the high-temperature expansion chamber (104) is connected to an engine cooling circulation pipeline, and the low-temperature expansion chamber (105) is connected to a motor system cooling circulation pipeline; An overflow pipe (2) connected to the high-temperature expansion chamber (104) and the low-temperature expansion chamber (105) respectively; A first pressure valve, arranged on the overflow pipe (2); as well as The second pressure valve is arranged in the exhaust port.

2. The expansion water tank according to claim 1, characterized in that: The liquid storage structure (1) comprises a high-temperature expansion tank and a low-temperature expansion tank, the inner cavity of the high-temperature expansion tank forms the high-temperature expansion chamber (104), and the inner cavity of the low-temperature expansion tank forms the low-temperature expansion chamber (105).

3. The expansion water tank according to claim 1, characterized in that: The liquid storage structure (1) comprises an expansion box (101) and a partition plate (102) arranged in the expansion box (101), wherein the partition plate (102) divides the inner cavity of the expansion box (101) into the high-temperature expansion chamber (104) and the low-temperature expansion chamber (105) along the left-right direction or the front-back direction.

4. The expansion water tank according to claim 3, characterized in that: The liquid storage structure (1) further comprises a separation plate (103), wherein the separation plate (103) and the partition plate (102) together separate the inner cavity of the expansion box (101) to form the high-temperature expansion chamber (104), the low-temperature expansion chamber (105) and the battery expansion chamber (106) which are independent of each other, and the battery expansion chamber (106) is connected to the battery cooling circulation pipeline.

5. The expansion water tank according to claim 1, characterized in that: The top of the liquid storage structure (1) is provided with a first opening for connecting the high-temperature expansion chamber (104) with the outside, and a second opening for connecting the low-temperature expansion chamber (105) with the outside. The liquid storage structure (1) also includes a first pressure cover (5) for sealing the first opening and a second pressure cover (6) for sealing the second opening. One end of the overflow pipe (2) is inserted into the first pressure cover (5), and the other end is inserted into the low-temperature expansion chamber (105).

6. The expansion water tank according to claim 1, characterized in that: The expansion water tank further comprises a first liquid level detector (7) arranged in the high-temperature expansion chamber (104), a second liquid level detector (8) arranged in the low-temperature expansion chamber (105), and a controller, wherein the first liquid level detector (7), the second liquid level detector (8), the first pressure valve and the second pressure valve are respectively connected to the liquid level detectors for communication.

7. The expansion water tank according to claim 1, characterized in that: The expansion water tank further comprises a mounting structure connected to the liquid storage structure (1), the mounting structure comprising a mounting bracket (3) and a fixing bracket (4), the mounting bracket (3) being fixed to the front cabin along the up-down direction, and the fixing bracket (4) being fixed to the front cabin along the front-back direction and / or the left-right direction.

8. The expansion water tank according to claim 7, characterized in that: The mounting bracket (3) comprises a mounting plate (301) and two reinforcing plates (302) respectively arranged on both sides of the mounting plate (301); the mounting plate (301) and the two reinforcing plates (302) form a "U"-shaped structure, and the mounting plate (301) and the two reinforcing plates (302) are both connected to the liquid storage structure (1); a mounting hole (303) is provided on the mounting plate (301), and the axis of the mounting hole (303) is parallel to the up and down direction.

9. The expansion water tank according to claim 7, characterized in that: The fixing bracket (4) comprises a fixing plate (401) and two reinforcing plates (402) respectively arranged on both sides of the fixing plate (401); the fixing plate (401) and the two reinforcing plates (402) form a "U"-shaped structure, and the fixing plate (401) and the two reinforcing plates (402) are both connected to the liquid storage structure (1); a fixing hole (403) is provided on the fixing plate (401); and the axis of the fixing hole (403) is parallel to the left-right direction or the front-back direction.

10. A vehicle, characterized in that An expansion water tank according to any one of claims 1 to 9.

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