Vent valve, urea box assembly and vehicle

Abstract

The utility model discloses a vent valve, urea box assembly and vehicle relates to vehicle manufacturing technical field, vent valve includes: shell, be equipped with first cavity and second cavity in the shell, the first cavity is communicated with first valve port, the second cavity is communicated with second valve port; the valve element assembly is installed in the shell, and when the pressure of the first cavity and the pressure of the second cavity are the same, the valve element assembly separates the first cavity from the pressure of the second cavity. And when the pressure of one of the first cavity and the second cavity is greater than the pressure of the other one, one of the first cavity and the second cavity is communicated with the other one of the first cavity and the second cavity. According to the vent valve disclosed by the utility model, the closure of the urea box can be realized, the ammonia gas precipitation speed is reduced, the service life of a urea water solution is prolonged, the cost is reduced, and the stability of pressure in the urea box is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle manufacturing technical field especially, and it relates to a vent valve, have the urea tank assembly with the vent valve and have the vehicle with the vent valve or the urea tank assembly. BACKGROUND

[0002] Urea is easy to emit ammonia after hydrolysis, therefore, under natural conditions, urea solution concentration will gradually reduce, when concentration is lower than set threshold value, urea concentration sensor will identify and cause instrument alarm prompt, at this moment, urea solution in urea tank needs to be replaced.

[0003] Therefore, urea solution has certain service life, especially when temperature is higher, urea solution service life will greatly reduce, and there is still room for improvement for how to prolong urea solution service life. UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a vent valve, the vent valve can realize the closure of urea tank, reduce ammonia emission rate, improve urea solution service life, reduce cost, and ensure the stability of urea tank pressure.

[0005] According to the vent valve of the utility model embodiment, the first cavity and the second cavity are separated by the valve core assembly when the pressure of the first cavity and the second cavity is the same, the independence and the sealing of the first cavity and the second cavity are realized, and the first cavity and the second cavity are communicated by the valve core assembly when the pressure of one of the first cavity and the second cavity is greater than the pressure of the other, so as to balance the pressure difference between the first cavity and the second cavity, realize the effective balance of the pressure in the shell, and then the sealing of the second cavity 12 can realize the closure of the urea tank, reduce the ammonia emission rate, improve the urea solution service life, reduce the cost, and ensure the stability of the urea tank pressure.

[0006] According to the vent valve of the utility model embodiment, the first cavity and the second cavity are separated by the valve core assembly when the pressure of the first cavity and the second cavity is the same, the independence and the sealing of the first cavity and the second cavity are realized, and the first cavity and the second cavity are communicated by the valve core assembly when the pressure of one of the first cavity and the second cavity is greater than the pressure of the other, so as to balance the pressure difference between the first cavity and the second cavity, realize the effective balance of the pressure in the shell, and then the sealing of the second cavity 12 can realize the closure of the urea tank, reduce the ammonia emission rate, improve the urea solution service life, reduce the cost, and ensure the stability of the urea tank pressure.

[0007] According to the vent valve of some embodiments of the present application, the valve core assembly comprises a first baffle and a second baffle, the first baffle is provided with a first communication port, the second baffle is provided with a second communication port, and an intermediate communication port is arranged between the first cavity and the second cavity; wherein when the pressure in the first cavity is greater than the pressure in the second cavity, the first communication port and the intermediate communication port jointly communicate the first cavity and the second cavity, and when the pressure in the second cavity is greater than the pressure in the first cavity, the second communication port and the intermediate communication port jointly communicate the first cavity and the second cavity.

[0008] According to the vent valve of some embodiments of the present application, the first baffle is movably installed in the first cavity, and the first baffle is adapted to block the intermediate communication port when the pressure in the first cavity is greater than the pressure in the second cavity, and the first communication port and the intermediate communication port are communicated; the second baffle is movably installed in the second cavity, and the second baffle is adapted to block the intermediate communication port when the pressure in the second cavity is greater than the pressure in the second cavity, and the second communication port and the intermediate communication port are communicated.

[0009] According to the vent valve of some embodiments of the present application, a separation portion is arranged in the housing, the separation portion is located between the first cavity and the second cavity, the intermediate communication port is formed in the separation portion, and the first baffle or the second baffle is adapted to abut against the separation portion to close the intermediate communication port.

[0010] According to the vent valve of some embodiments of the present application, the vent valve further comprises a first elastic member connected between the inner wall of the first cavity and the first baffle, and used to push the first baffle to abut against the separation portion; and / or, further comprising a second elastic member connected between the inner wall of the second cavity and the second baffle, and used to push the second baffle to abut against the separation portion.

[0011] According to the vent valve of some embodiments of the present application, the first baffle is formed with a blocking portion protruding towards the second baffle, the blocking portion is arranged in the intermediate communication port and spaced apart from the inner wall of the intermediate communication port, and the blocking portion is adapted to extend into the second communication port to block the second communication port when the pressures in the first cavity and the second cavity are the same.

[0012] According to the vent valve of some embodiments of the present application, the vent valve further comprises a waterproof and breathable membrane, and the waterproof and breathable membrane is arranged at one of the first valve port and the second valve port.

[0013] According to the air vent valve of some embodiments of the present application, one of the first valve port and the second valve port is provided with a waterproof cover, the waterproof air permeable film is arranged in the waterproof cover, and a plurality of valve holes are arranged at the waterproof cover.

[0014] The utility model also provides a urea tank assembly.

[0015] According to the urea tank assembly of the embodiments of the present application, the air vent valve of any one of the above embodiments is arranged on the urea tank, one of the first valve port and the second valve port is communicated with the accommodating cavity, and the other is communicated to the outside of the accommodating cavity.

[0016] The utility model also provides a vehicle.

[0017] According to the vehicle of the embodiments of the present application, the air vent valve of any one of the above embodiments or the urea tank assembly of the above embodiments is arranged.

[0018] The urea tank assembly, the vehicle and the air vent valve have the same advantages as the prior art, and details are not repeated here.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a structure schematic view of the urea tank assembly according to the embodiments of the present application;

[0022] Figure 2 is a structure schematic view of the air vent valve according to the embodiments of the present application Figure One ;

[0023] Figure 3 is a structure schematic view of the air vent valve according to the embodiments of the present application Figure Two ;

[0024] Figure 4 is a cross-sectional view of the air vent valve according to the embodiments of the present application Figure One ;

[0025] Figure 5 is a cross-sectional view of the air vent valve according to the embodiments of the present application Figure Two ;

[0026] Figure 6is a cross section of the vent valve according to the embodiment of the utility model Figure Three .

[0027] Reference signs:

[0028] Urea tank assembly 100, vent valve 101, urea tank 102, containing cavity 1021, urea pump assembly 103, urea filling pipe 104, vent pipe 105,

[0029] Housing 1, first cavity 11, first valve port 111, second cavity 12, second valve port 121,

[0030] Valve core assembly 2, first baffle 21, first communication port 211, second baffle 22, second communication port 221, intermediate communication port 222, partition 3, first elastic member 41, second elastic member 42, plugging part 5, waterproof air-permeable membrane 6, waterproof cover 7, valve hole 71. DETAILED DESCRIPTION

[0031] The embodiments of the utility model will be described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0032] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as limiting the utility model. In addition, the features limited as "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following is for reference. Figures 1-6 The vent valve 101 according to an embodiment of the present invention can achieve the sealing of the urea tank 102, reduce the ammonia precipitation rate, improve the service life of the urea solution, reduce costs, and at the same time ensure the stability of the pressure inside the urea tank 102.

[0035] like Figures 1-6 As shown, a vent valve 101 according to an embodiment of the present invention includes: a housing 1 and a valve core assembly 2.

[0036] First, it should be noted that the vent valve 101 of this utility model can be used for sealing and pressure balancing of any structure or device. The following description will take its application in the urea tank 102 as an example.

[0037] The housing 1 has a first cavity 11 and a second cavity 12. The first cavity 11 is connected to a first valve port 111, and the second cavity 12 is connected to a second valve port 121.

[0038] Specifically, the shell 1 is an external structure of the vent valve 101, which can protect the internal valve core assembly 2 or other structural components from the external environment, and ensure the internal gas flow and sealing, and the shell 1 can be hollow to form a first cavity 11 and a second cavity 12, which can be separated or communicated. The first cavity 11 is communicated with a first valve port 111, i.e. the gas in the first cavity 11 and the gas outside the first cavity 11 can flow through the first valve port 111, for example, the gas outside the first cavity 11 can enter the first cavity 11 through the first valve port 111, and the gas in the first cavity 11 can also flow out of the first cavity 11 through the first valve port 111, and the second cavity 12 is communicated with a second valve port 121, i.e. the gas in the second cavity 12 and the gas outside the second cavity 12 can flow through the second valve port 121, for example, the gas outside the second cavity 12 can enter the second cavity 12 through the second valve port 121, and the gas in the second cavity 12 can also flow out of the second cavity 12 through the second valve port 121. In practice, the first valve port 111 can be communicated with the external environment, so that the gas in the first cavity 11 can flow into the external environment through the first valve port 111 or the gas in the external environment can flow into the first cavity 11 through the first valve port 111, and the second valve port 121 can be communicated with the urea tank 102, so that the gas in the second cavity 12 can flow into the urea tank 102 through the second valve port 121 or the gas in the urea tank 102 can flow into the second cavity 12 through the second valve port 121.

[0039] Further, the valve core assembly 2 is a key structural component for controlling whether the first cavity 11 and the second cavity 12 are in a communicated state, and the valve core assembly 2 is installed in the shell 1, so that the shell 1 can protect the valve core assembly 2, and the valve core assembly 2 can move in the shell 1 to separate or communicate the first cavity 11 and the second cavity 12.

[0040] Among them, the valve core assembly 2 separates the first cavity 11 and the second cavity 12 when the pressures of the first cavity 11 and the second cavity 12 are the same, and is used to conduct from one of the first cavity 11 and the second cavity 12 to the other when the pressure of one of the first cavity 11 and the second cavity 12 is greater than that of the other.

[0041] Specifically, when the pressure in the first cavity 11 is the same as or similar to the pressure in the second cavity 12, that is, the pressure in the shell 1 is in a balanced state or the pressure difference is within a certain range, at this time, the valve core assembly 2 can separate the first cavity 11 from the second cavity 12, so that the gas in the first cavity 11 cannot flow with the gas in the second cavity 12, thereby ensuring the independence and respective sealing of the first cavity 11 and the second cavity 12. Further, since the second cavity 12 is in communication with the urea tank 102 and the first cavity 11 is in communication with the external environment, the gas in the external environment is separated from the gas in the urea tank 102, thereby achieving sealing of the urea tank 102, which can effectively prevent the ammonia gas volatilized after urea water is decomposed from flowing into the external environment to reduce the concentration of urea water solution, that is, the volatilized ammonia gas is enclosed in the urea tank 102, thereby reducing the ammonia gas precipitation speed, improving the service life of urea water solution, and further reducing the cost of replacing urea and reducing costs.

[0042] When the pressure in the first cavity 11 is different from the pressure in the second cavity 12, that is, the pressure in the shell 1 is in an unbalanced state, for example, when the pressure in the first cavity 11 is greater than the pressure in the second cavity 12, or the pressure in the second cavity 12 is greater than the pressure in the first cavity 11, due to the existence of the pressure difference, the pressure difference can act on the valve core assembly 2, which can make the first cavity 11 to the second cavity 12 conductive or the second cavity 12 to the first cavity 11 conductive, thereby making the first cavity 11 and the second cavity 12 conductive, at this time, the gas in the first cavity 11 can flow with the gas in the second cavity 12, thereby making the pressure in the first cavity 11 and the pressure in the second cavity 12 the same, achieving effective balance of the pressure in the shell 1. Further, since the second cavity 12 is in communication with the urea tank 102 and the first cavity 11 is in communication with the external environment, thereby achieving effective balance between the pressure of the external environment and the pressure in the urea tank 102, that is, making the pressure of the external environment and the pressure in the urea tank 102 the same or within a certain range, thereby ensuring the stability of the pressure in the urea tank 102, preventing the urea tank 102 from being unable to operate normally due to excessive or insufficient pressure.

[0043] Therefore, by flexibly controlling the separation or communication of the first cavity 11 and the second cavity 12 by the valve core assembly 2, the effective balance of the pressure in the first cavity 11 and the pressure in the second cavity 12 can be achieved, and the independence and respective sealing of the first cavity 11 and the second cavity 12 when the pressure is balanced are also ensured.

[0044] According to the vent valve 101 of the present embodiment, the independence and the respective sealing of the first cavity 11 and the second cavity 12 are realized by the valve core assembly 2 separating the first cavity 11 and the second cavity 12 when the pressures of the first cavity 11 and the second cavity 12 are the same, and the effective balance of the pressure in the shell 1 is realized by the valve core assembly 2 conducting from one of the first cavity 11 and the second cavity 12 to the other when the pressure of one of the first cavity 11 and the second cavity 12 is greater than that of the other, so as to balance the pressure difference between the first cavity 11 and the second cavity 12, and further, the sealing of the second cavity 12 can realize the sealing of the urea tank 102, reduce the ammonia precipitation speed, prolong the service life of the urea solution, reduce the cost, and ensure the stability of the pressure in the urea tank 102.

[0045] In some embodiments, as shown in Figures 4-6 The valve core assembly 2 includes a first baffle 21 and a second baffle 22, the first baffle 21 is provided with a first communication port 211, the second baffle 22 is provided with a second communication port 221, and an intermediate communication port 222 is arranged between the first cavity 11 and the second cavity 12. The first communication port 211, the second communication port 221 and the intermediate communication port 222 can be circular, oval, square or irregular, etc., which can be set according to actual needs.

[0046] Further, when the pressure in the first cavity 11 exceeds the set pressure in the second cavity 12, the first communication port 211 and the intermediate communication port 222 jointly communicate the first cavity 11 and the second cavity 12, so that the gas in the first cavity 11 can flow into the second cavity 12 through the first communication port 211 and the intermediate communication port 222, so that the pressure in the first cavity 11 is the same as that in the second cavity 12, thereby realizing the effective balance of the pressure in the first cavity 11 and the second cavity 12.

[0047] And when the pressure in the second cavity 12 exceeds the set pressure in the first cavity 11, the second communication port 221 and the intermediate communication port 222 jointly communicate the first cavity 11 and the second cavity 12, so that the gas in the second cavity 12 can flow into the first cavity 11 through the second communication port 221 and the intermediate communication port 222, so that the pressure in the first cavity 11 is the same as that in the second cavity 12, thereby realizing the effective balance of the pressure in the first cavity 11 and the second cavity 12.

[0048] In practice, since the first cavity 11 is in communication with the external environment and the second cavity 12 is in communication with the urea tank 102, when the pressure in the urea tank 102 is within the set pressure range, the vent valve 101 is in a closed state, i.e. the first cavity 11 is separated from the second cavity 12, i.e. the pressure difference between the first cavity 11 and the second cavity 12 is within a certain range, at this time, the urea tank 102 is in a closed state, and the ammonia gas generated by the decomposition of urea is enclosed in the urea tank 102, which can reduce the decomposition rate of urea when the ammonia gas reaches a certain concentration, thereby improving the service life of urea.

[0049] When the pressure in the urea tank 102 exceeds the set pressure range, i.e. the pressure in the urea tank 102 is too high or too low, the valve core assembly 2 will move or move to balance the pressure difference between the first cavity 11 and the second cavity 12. For example, when the pressure in the urea tank 102 is greater than the set pressure range, the gas in the first cavity 11 can flow into the second cavity 12 through the first communication port 211 and the intermediate communication port 222, and when the pressure in the urea tank 102 is less than the set pressure range, the gas in the second cavity 12 can flow into the first cavity 11 through the second communication port 221 and the intermediate communication port 222, so that the pressure in the first cavity 11 is the same as the pressure in the second cavity 12, i.e. the pressure in the urea tank 102 is the same as the pressure in the external environment, thereby ensuring that the pressure in the urea tank 102 is stable and can work normally.

[0050] In some embodiments, the first baffle 21 is movably installed in the first cavity 11, and the first baffle 21 is adapted to block the intermediate communication port 222 when the pressure in the first cavity 11 is greater than the set pressure in the second cavity 12 and the first communication port 211 and the intermediate communication port 222 are in communication. That is, the first baffle 21 is installed in the first cavity 11 and can move in the first cavity 11, the first baffle 21 is simultaneously subjected to the pressure in the first cavity 11 and the pressure in the second cavity 12, and reacts to the pressure difference, since the second cavity 12 is in communication with the urea tank 102, the pressure in the second cavity 12 is the same as the pressure in the urea tank 102, and the set pressure in the second cavity 12 can be a value or a certain range.

[0051] Reference is made to the accompanying drawings Figure 6As shown, when the pressure in the first cavity 11 is greater than the set pressure in the second cavity 12, i.e. the first baffle 21 is subjected to a greater pressure in the first cavity 11 than the set pressure in the second cavity 12, the first baffle 21 will block the intermediate communication port 222 under the action of the pressure difference, and the first communication port 211 is in communication with the intermediate communication port 222. Since the pressure in the first cavity 11 is greater, the gas in the first cavity 11 can flow into the intermediate communication port 222 and then into the second cavity 12, so that the pressures in the first cavity 11 and the second cavity 12 are the same, achieving the balance of the first cavity 11 and the second cavity 12, thereby preventing the pressure in the urea tank 102 from being too small, and stabilizing the internal pressure within a certain range.

[0052] Further, the second baffle 22 is movably installed in the second cavity 12, and the second baffle 22 is adapted to block the intermediate communication port 222 and the second communication port 221 is in communication with the intermediate communication port 222 when subjected to a greater pressure in the second cavity 12 than the set pressure in the first cavity 11. That is, the second baffle 22 is installed in the second cavity 12 and can move in the second cavity 12, and the second baffle 22 is subjected to the pressure in the first cavity 11 and the pressure in the second cavity 12, and reacts to the pressure difference. The set pressure in the first cavity 11 can be a value or a certain range.

[0053] Reference is made to the accompanying drawings Figure 5 As shown, when the pressure in the second cavity 12 is greater than the set pressure in the first cavity 11, i.e. the second baffle 22 is subjected to a smaller pressure in the first cavity 11 than the set pressure in the second cavity 12, the second baffle 22 will block the intermediate communication port 222 under the action of the pressure difference, and the second communication port 221 is in communication with the intermediate communication port 222. Since the pressure in the second cavity 12 is greater, the gas in the second cavity 12 can flow into the intermediate communication port 222 through the second communication port 221, and then flow into the first cavity 11, so that the pressures in the first cavity 11 and the second cavity 12 are the same, achieving the balance of the first cavity 11 and the second cavity 12, thereby preventing the pressure in the urea tank 102 from being too large, and stabilizing the internal pressure within a certain range.

[0054] Specifically, as shown Figures 4-6 As shown, the first baffle 21 and the second baffle 22 are spaced apart in the up-down direction, the first baffle 21 is located on the upper side, the second baffle 22 is located on the lower side, and the first baffle 21 and the second baffle 22 are spaced apart to form the intermediate communication port 222 between the first cavity 11 and the second cavity 12. The first baffle 21 is installed in the first cavity 11 and can move in the first cavity 11 in the up-down direction, and the second baffle 22 is installed in the second cavity 12 and can move in the second cavity 12 in the up-down direction.

[0055] As shown in Figure 4 and Figure 6 , the first baffle plate 21 is subjected to the pressure in the first cavity 11 and the pressure in the second cavity 12 at the same time. When the pressure in the first cavity 11 that the first baffle plate 21 is subjected to is greater than the set pressure in the second cavity 12 that the first baffle plate 21 is subjected to, the atmospheric pressure in the external environment acts on the second baffle plate 22 to push the second baffle plate 22 to move downward in the second cavity 12, so that the intermediate communication port 222 communicates with the second cavity 12. At the same time, the first baffle plate 21 blocks the intermediate communication port 222 and the first communication port 211 communicates with the intermediate communication port 222, so that the first cavity 11 and the second cavity 12 communicate through the first communication port 211 and the intermediate communication port 222. Therefore, the gas in the first cavity 11 can flow to the second cavity 12 through the first communication port 211 and the intermediate communication port 222, and then flow to the urea tank 102 through the second valve port 121, so as to increase the pressure in the urea tank 102 and ensure the stability of the pressure in the urea tank 102.

[0056] As shown in Figure 4 and Figure 5 , the second baffle plate 22 is subjected to the pressure in the first cavity 11 and the pressure in the second cavity 12 at the same time. When the pressure in the first cavity 11 that the second baffle plate 22 is subjected to is less than the set pressure in the second cavity 12 that the second baffle plate 22 is subjected to, the pressure in the urea tank 102 acts on the first baffle plate 21 to push the first baffle plate 21 to move in the first cavity 11, so that the intermediate communication port 222 communicates with the first cavity 11. At the same time, the second baffle plate 22 blocks the intermediate communication port 222 and the second communication port 221 communicates with the intermediate communication port 222, so that the first cavity 11 and the second cavity 12 communicate through the second communication port 221 and the intermediate communication port 222. Therefore, the gas in the second cavity 12 can flow to the first cavity 11 through the second communication port 221 and the intermediate communication port 222, and then flow to the external environment through the first valve port 111, so as to reduce the pressure in the urea tank 102 and realize pressure relief, thereby ensuring the stability of the pressure in the urea tank 102.

[0057] In some embodiments, the housing 1 is provided with a partition 3, the partition 3 is located between the first cavity 11 and the second cavity 12, and the intermediate communication port 222 is formed in the partition 3. The first baffle plate 21 or the second baffle plate 22 is adapted to abut against the partition 3 to close the intermediate communication port 222.

[0058] Specifically, as shown in Figures 4-6As shown, the inner wall of the shell 1 is inwardly convex to form a partition 3 between the first cavity 11 and the second cavity 12. The cavity above the partition 3 is the first cavity 11, and the cavity below the partition 3 is the second cavity 12. The partition 3 is annular, and the gap in the middle is the middle communication port 222, as shown in Figure 4 As shown, when the pressure in the first cavity 11 is the same as or close to the pressure in the second cavity 12, i.e. the pressure is in a balanced state or the pressure difference is within a certain range, the first baffle 21 is pressed against the upper side of the partition 3, and the second baffle 22 is pressed against the lower side of the partition 3, thereby simultaneously closing the middle communication port 222 from above and below, and as shown in Figure 6 As shown, when the pressure in the first cavity 11 is greater than the pressure in the second cavity 12, i.e. when the first baffle 21 is subjected to a greater pressure in the first cavity 11 than the set pressure in the second cavity 12, the first baffle 21 is pressed against the upper side of the partition 3 to close the middle communication port 222 from above, while the second baffle 22 is separated from the lower side of the partition 3 to allow the first communication port 211 to communicate with the middle communication port 222, and as shown in Figure 5 As shown, when the pressure in the second cavity 12 is greater than the pressure in the first cavity 11, i.e. when the second baffle 22 is subjected to a smaller pressure in the first cavity 11 than the set pressure in the second cavity 12, the second baffle 22 is pressed against the lower side of the partition 3 to close the middle communication port 222 from below, while the first baffle 21 is separated from the upper side of the partition 3 to allow the second communication port 221 to communicate with the middle communication port 222.

[0059] In some embodiments, the vent valve 101 further comprises a first elastic member 41 connected between the inner wall of the first cavity 11 and the first baffle 21, and configured to push the first baffle 21 against the partition 3.

[0060] Specifically, the first elastic member 41 has a certain elastic force, and the initial elastic force of the first elastic member 41 can be used to push the first baffle 21 against the partition 3, so that the first baffle 21 remains in a stable state, as shown in Figure 4 As shown, the first elastic member 41 extends in the up-down direction, the upper end of the first elastic member 41 is pressed and connected to the inner wall of the first cavity 11, and the lower end of the first elastic member 41 is pressed and connected to the upper side of the first baffle 21. When the first elastic member 41 is in an initial state, i.e. not subjected to external force and elastically deformed, the initial elastic force of the first elastic member 41 can be used to push the first baffle 21 against the partition 3.

[0061] When the pressure in the second cavity 12 is greater than the set pressure in the first cavity 11, as shown in Figure 5As shown, the second baffle plate 22 will be pressed upward by the pressure and be kept in a stable position, and the first baffle plate 21 will also be pressed upward, when the pressure on the first baffle plate 21 is greater than the elastic force of the first elastic member 41 keeping the initial state, the first baffle plate 21 will move upward to compress the first elastic member 41, so that the second communication port 221 communicates with the intermediate communication port 222, and then the first cavity 11 communicates with the second cavity 12, in other words, the set pressure in the first cavity 11 can be the elastic force of the first elastic member 41 keeping the first baffle plate 21 can be pressed against the partition 3, when the pressure in the second cavity 12 increases to overcome the elastic force of the first elastic member 41, the first baffle plate 21 will move upward under the action of the pressure difference to compress the first elastic member 41.

[0062] After pressure balance, that is, the pressure in the first cavity 11 is the same or similar to the pressure in the second cavity 12, there is no pressure difference or the pressure difference is within a certain range, the first baffle plate 21 is no longer affected by the gas pressure difference, at this time, the elastic force of the first elastic member 41 returning to the initial state acts on the first baffle plate 21 to push the first baffle plate 21 to move downward and press against the partition 3.

[0063] In some other embodiments, a second elastic member 42 is further included, which is connected between the inner wall of the second cavity 12 and the second baffle plate 22, and is used to push the second baffle plate 22 to press against the partition 3.

[0064] Specifically, the second elastic member 42 has a certain elastic force, and the elastic force of the second elastic member 42 can be used to push the second baffle plate 22 to press against the partition 3, so that the second baffle plate 22 is kept in a stable state, as shown in Figure 4 As shown, the second elastic member 42 extends in the up-down direction, the lower end of the second elastic member 42 is connected to the inner wall of the second cavity 12, and the upper end of the second elastic member 42 is connected to the lower side of the second baffle plate 22, when the second elastic member 42 is in the initial state, that is, not subjected to external force and elastically deformed, the initial elastic force of the second elastic member 42 can be used to push the second baffle plate 22 to press against the partition 3.

[0065] When the pressure in the first cavity 11 is greater than the set pressure in the second cavity 12, as shown in Figure 6As shown, the first baffle plate 21 will be pressed by the downward pressure against the partition 3 and remain in a stable position, and the second baffle plate 22 will also be pressed by the downward pressure. When the pressure acting on the second baffle plate 22 is greater than the elastic force of the second elastic member 42 maintaining the initial state, the second baffle plate 22 will move downward to compress the second elastic member 42, so that the first communication port 211 communicates with the intermediate communication port 222, and then the first cavity 11 communicates with the second cavity 12. In other words, the set pressure in the second cavity 12 can be the elastic force of the second elastic member 42 maintaining the initial state so that the second baffle plate 22 can be pressed against the partition 3. When the pressure in the first cavity 11 increases to overcome the elastic force of the second elastic member 42, the second baffle plate 22 will move downward under the action of the pressure difference to compress the second elastic member 42.

[0066] After pressure balance, that is, the pressure in the first cavity 11 is the same as or close to the pressure in the second cavity 12, or there is no pressure difference or the pressure difference is within a certain range, the second baffle plate 22 is no longer affected by the gas pressure difference. At this time, the elastic force of the second elastic member 42 restoring to the initial state acts on the second baffle plate 22 to push the second baffle plate 22 to move upward and press against the partition 3.

[0067] In actual design, the first elastic member 41 and the second elastic member 42 can be configured as springs.

[0068] Therefore, the elastic force of the first elastic member 41 and the second elastic member 42 can make the first baffle plate 21 and the second baffle plate 22 press against the partition 3 and remain in a stable state, preventing the two baffle plates from deviating to cause the first cavity 11 and the second cavity 12 to communicate. At the same time, the elastic force of the first elastic member 41 and the second elastic member 42 restoring to the initial state can make the first baffle plate 21 and the second baffle plate 22 press against the partition 3 again after the pressure balance, thereby realizing the automatic opening and closing of the breather valve 101, which is flexible, convenient, safe and reliable.

[0069] In addition, as shown, Figures 4-6 The first elastic member 41 and the second elastic member 42 are both provided, and the two first elastic members 41 are distributed at the two ends of the first baffle plate 21, so that the entire first baffle plate 21 can stably press against the partition 3. The two second communication ports 221 are distributed away from the two first elastic members 41 to avoid interference between the first elastic member 41 and the first communication port 211. Therefore, the radial dimension of the first communication port 211 is set to be smaller than the radial dimension of the second communication port 221.

[0070] The two second elastic members 42 are distributed at the two ends of the second baffle plate 22, so that the entire second baffle plate 22 can stably press against the partition 3.

[0071] In some embodiments, the first baffle 21 is formed with a blocking portion 5 protruding toward the second baffle 22. The blocking portion 5 passes through the intermediate communication port 222 and is spaced apart from the inner wall of the intermediate communication port 222. The blocking portion 5 is adapted to extend into the second communication port 221 to block the second communication port 221 when the pressure of the first cavity 11 and the second cavity 12 is the same.

[0072] Specifically, such as Figures 4-6 As shown, a sealing part 5 protruding downwards towards the second baffle 22 is formed on the first baffle 21. The sealing part 5 passes through the intermediate connecting port 222 and is spaced apart from the inner wall of the intermediate connecting port 222 to prevent interference with the intermediate connecting port 222. The shape and size of the sealing part 5 match the second connecting port 221 and the positions are directly opposite each other. In this way, when the pressure in the first cavity 11 and the second cavity 12 is the same or similar, the sealing part 5 can smoothly extend into the second connecting port 221 to completely seal the second connecting port 221, preventing gaps from forming and causing the gas in the first cavity 11 and the gas in the second cavity 12 to flow to each other.

[0073] And such as Figures 4-6 As shown, the sealing part 5 has a certain thickness, and the thickness of the sealing part 5 is the same as the size of the second connecting port 221. In other words, the size of the second connecting port 221 determines the thickness of the sealing part 5, and the length of the sealing part 5 in the vertical direction is greater than the length of the partition part 3 in the vertical direction. In this way, the first baffle 21 and the second baffle 22 can float slightly under a small pressure difference, while maintaining the sealing of the second connecting port 221.

[0074] The radial dimension of the second connecting port 221 is larger than that of the first connecting port 211. Thus, when the pressure on the first baffle 21 within the first cavity 11 is greater than the set pressure within the second cavity 12, a portion of the gas in the first cavity 11 can quickly enter the second cavity 12 through the intermediate connecting port 222 and the second connecting port 221, while another portion of the gas can directly enter the second cavity 12 through the intermediate connecting port 222. This allows for rapid pressure balance between the first and second cavities 11 and 12. Conversely, when the pressure on the second baffle 22 within the first cavity 11 is less than the set pressure within the second cavity 12, a portion of the gas in the second cavity 12 can quickly enter the first cavity 11 through the second connecting port 221 and the intermediate connecting port 222, while another portion of the gas can enter the first cavity 11 through the second connecting port 221, the intermediate connecting port 222, and the first connecting port 211. This again allows for rapid pressure balance between the first and second cavities 11 and 12.

[0075] In addition, such as Figures 4-6As shown, two first connecting ports 211 are provided and spaced apart on both sides of the sealing part 5. In the projection along the vertical direction, the second connecting port 221 is located between the two first connecting ports 211. In this way, by reasonably arranging the various structures, the second connecting port 221 and the first connecting port 211 are staggered, which is conducive to the sealing of the second connecting port 221. This facilitates the connection and separation of the first cavity 11 and the second cavity 12. Furthermore, by providing two second connecting ports 221, the gas flow efficiency can be increased and the pressure balance efficiency can be improved.

[0076] In practice, the blocking part 5 can be set to a cylindrical, conical, stepped, square or irregular shape, etc., to match the second connecting port 221 and close the second connecting port 221. The specific shape can be flexibly set according to the actual situation and needs, and is not limited to the one described in this embodiment.

[0077] In some embodiments, the vent valve 101 further includes a waterproof and breathable membrane 6, which is disposed at one of the first valve port 111 and the second valve port 121.

[0078] In other words, the waterproof and breathable membrane 6 can be set at the first valve port 111, or it can be set at the second valve port 121. The waterproof and breathable membrane 6 has the functions of waterproofing and breathability. It can allow gas to pass through while preventing liquid from passing through, thus achieving a waterproof effect. By setting the waterproof and breathable membrane 6 at the first valve port 111, the smooth flow of gas at the first valve port 111 can be maintained while preventing external liquid from flowing into the first cavity 11 and then into the second cavity 12, thus contaminating the first cavity 11 and the second cavity 12. By setting the waterproof and breathable membrane 6 at the second valve port 121, the smooth flow of gas at the second valve port 121 can be maintained while preventing external liquid from flowing into the second cavity 12 and then into the first cavity 11, thus contaminating the first cavity 11 and the second cavity 12.

[0079] Specifically, such as Figures 4-6 As shown, the waterproof and breathable membrane 6 is disposed at the second valve port 121, which is connected to the urea tank 102. This allows gas to flow smoothly from the second cavity 12 into the urea tank 102, or vice versa. At the same time, it effectively prevents the urea solution in the urea tank 102 from flowing out into the vent valve 101 and then into the external environment, thereby further improving the sealing performance of the vent valve 101, further reducing the urea decomposition rate, and extending the service life of the urea solution.

[0080] In some embodiments, a waterproof cover 7 is provided at one of the first valve port 111 and the second valve port 121, a waterproof and breathable membrane 6 is disposed inside the waterproof cover 7, and a plurality of valve holes 71 are provided at the waterproof cover 7.

[0081] That is, the waterproof cover 7 can be arranged at the first valve port 111, or the waterproof cover 7 can be arranged at the second valve port 121, the waterproof cover 7 can be arranged at the first valve port 111 or the second valve port 121 to protect the first valve port 111 or the second valve port 121, and the waterproof effect is realized, the waterproof and breathable film 6 can be arranged in the waterproof cover 7 to further realize the waterproof effect, prevent external liquid from entering the breather valve 101 from the first valve port 111 or the second valve port 121, and effectively ensure the dryness and cleanliness in the breather valve 101. The waterproof cover 7 can be provided with two, three or more valve holes 71, and the gas can flow from the second cavity 12 to the outside of the second cavity 12 or flow from the outside of the second cavity 12 to the second cavity 12.

[0082] Specifically, as shown in Fig. 4- Figure 6 The waterproof cover 7 is arranged at the second valve port 121, the waterproof and breathable film 6 is arranged in the waterproof cover 7, the second valve port 121 is communicated with the urea tank 102, and as Figure 2 shown, the waterproof cover 7 is provided with a plurality of valve holes 71 distributed in multiple layers and multiple columns, so that the gas in the urea tank 102 and the second cavity 12 can flow smoothly while effectively preventing the urea solution in the urea tank 102 from flowing into the breather valve 101.

[0083] The utility model also provides a urea tank assembly 100.

[0084] According to the urea tank assembly 100 of the utility model embodiment, the urea tank 102 is formed with a containing cavity 1021, the breather valve 101 is installed on the urea tank 102, one of the first valve port 111 and the second valve port 121 is communicated with the containing cavity 1021 and the other is communicated to the outside of the containing cavity 1021, that is, the first valve port 111 can be communicated with the containing cavity 1021, the second valve port 121 is communicated to the outside of the containing cavity 1021, or the second valve port 121 can be communicated with the containing cavity 1021, and the first valve port 111 is communicated to the outside of the containing cavity 1021.

[0085] Specifically, as Figure 1As shown, the urea tank 102 is hollow to form a containing cavity 1021, and the urea solution is contained in the containing cavity 1021, and a urea pump assembly 103 can be arranged in the containing cavity 1021 to pump the urea solution into or out of the containing cavity 1021, or a urea filling pipe 104 can be arranged on the outside of the tank body, and the urea solution can be injected into the containing cavity 1021 through the urea filling pipe 104.

[0086] The valve core assembly 2 separates the first cavity 11 and the second cavity 12 when the pressures of the first cavity 11 and the second cavity 12 are the same, thereby realizing the independence and sealing of the first cavity 11 and the second cavity 12, and the valve core assembly 2 conducts from one of the first cavity 11 and the second cavity 12 to the other when the pressure of one of the first cavity 11 and the second cavity 12 is greater than that of the other, thereby balancing the pressure difference between the first cavity 11 and the second cavity 12 and effectively balancing the pressure in the shell 1, and the sealing of the second cavity 12 can realize the sealing of the urea tank 102, thereby reducing the ammonia precipitation speed, prolonging the service life of the urea solution, reducing the cost, and ensuring the stability of the pressure in the urea tank 102.

[0087] The utility model also provides a vehicle.

[0088] The vehicle according to the utility model embodiment is provided with the vent valve 101 of any one of the above embodiments or the urea tank assembly 100 of the above embodiments.

[0089] The vent valve 101 of any one of the above embodiments can also be applied to the fuel system, the cooling system, the turbocharging system and other structures or systems or devices requiring automatic pressure balancing of the vehicle, by arranging the vent valve 101 in the fuel system, the vent valve 101 can effectively prevent the generation of vacuum or excessively high air pressure, by arranging the vent valve 101 in the cooling system, the vent valve 101 can prevent the engine overheating caused by insufficient cooling liquid, when the cooling liquid is insufficient, the vent valve 101 can be automatically opened to allow part of the cooling liquid to flow back, thereby balancing the internal pressure of the system and protecting the engine from overheating damage, by arranging the vent valve 101 in the turbocharging system, the vent valve 101 can discharge excess air or release pressure, thereby protecting the engine and the turbocharger.

[0090] By setting the urea tank assembly 100, the continuous effectiveness of the urea solution during the use of the vehicle can be ensured, so as to reduce the exhaust emission, protect the environment, and prolong the service life of the vehicle.

[0091] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.​

Claims

1. A vent valve characterized by, Comprising: a housing, a first cavity and a second cavity are formed in the housing, the first cavity is communicated with a first valve port, the second cavity is communicated with a second valve port; a valve core assembly is installed in the housing, the valve core assembly separates the first cavity and the second cavity when the pressure of the first cavity and the second cavity is the same, and is used to communicate one of the first cavity and the second cavity to the other when the pressure of one of the first cavity and the second cavity is greater than the pressure of the other.

2. The vent valve of claim 1, wherein, The valve core assembly comprises a first baffle and a second baffle, the first baffle is provided with a first communication port, the second baffle is provided with a second communication port, and an intermediate communication port is provided between the first cavity and the second cavity; Wherein, after the pressure in the first cavity exceeds the set pressure in the second cavity, the first communication port and the intermediate communication port jointly communicate the first cavity and the second cavity, and after the pressure in the second cavity exceeds the set pressure in the first cavity, the second communication port and the intermediate communication port jointly communicate the first cavity and the second cavity.

3. The vent valve of claim 2, wherein, The first baffle is movably installed in the first cavity, and the first baffle is adapted to block the intermediate communication port and the first communication port communicates with the intermediate communication port when the pressure in the first cavity is greater than the set pressure in the second cavity; The second baffle is movably installed in the second cavity, and the second baffle is adapted to block the intermediate communication port and the second communication port communicates with the intermediate communication port when the pressure in the second cavity is greater than the set pressure in the first cavity.

4. The vent valve of claim 3, wherein, A partition is provided in the housing, the partition is located between the first cavity and the second cavity, the intermediate communication port is formed in the partition, and the first baffle or the second baffle is adapted to press against the partition to close the intermediate communication port.

5. The vent valve of claim 4, wherein, Further comprising a first elastic member connected between the inner wall of the first cavity and the first baffle, and used to push the first baffle to press against the partition; And / or, further comprising a second elastic member connected between the inner wall of the second cavity and the second baffle, and used to push the second baffle to press against the partition.

6. The breather valve of claim 2, wherein, The first baffle is formed with a blocking part protruding towards the second baffle, the blocking part is provided in the intermediate communication port and spaced apart from the inner wall of the intermediate communication port, and the blocking part is adapted to extend into the second communication port to block the second communication port when the pressure of the first cavity and the second cavity is the same.

7. The breather valve according to any one of claims 1-6, wherein, Further comprising a waterproof and breathable membrane provided at one of the first valve port and the second valve port.

8. The vent valve of claim 7, wherein, One of the first valve port and the second valve port is provided with a waterproof cover, the waterproof and breathable membrane is provided in the waterproof cover, and a plurality of valve holes are provided at the waterproof cover.

9. A urea tank assembly characterized in that, A urea tank having a receiving cavity formed therein, and a vent valve as claimed in any one of claims 1 to 8 mounted to the urea tank, one of the first valve port and the second valve port communicating with the receiving cavity and the other communicating to outside the receiving cavity.

10. A vehicle characterized by comprising: A urea tank assembly as claimed in claim 9, provided with a vent valve as claimed in any one of claims 1 to 8.

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