Urea supply system and vehicle

Abstract

The utility model provides a urea supply system and a vehicle, and relates to the technical field of vehicle tail gas treatment. The urea supply system comprises a containing box, the containing box is used for being arranged at the bottom of a liquid storage box, the containing box is provided with a liquid inlet communicated with the liquid storage box, the liquid inlet is located below the liquid level in the liquid storage box, and the containing box is further provided with a liquid outlet, an air inlet and an exhaust port; the air inlet assembly is used for communicating with the air inlet; the exhaust part is used for controlling the exhaust port to be opened or closed; the spraying assembly is used for being communicated with the liquid outlet; and the accommodating box is configured to be communicated with the external atmosphere through the exhaust port when the exhaust part opens the exhaust port. Liquid in the containing box is driven by gas pressure and sprayed out from the spraying assembly through the liquid outlet, and a driving medium of the containing box is changed into gas from a mechanical part, so that mechanical driving abrasion is reduced, and the service life of the pump body is prolonged.

Description

Technical Field

[0001] This application relates to the field of vehicle exhaust technology, and more particularly to a urea supply system and a vehicle. Background Technology

[0002] During the vehicle exhaust treatment process, a urea supply unit is needed to provide urea solution, which is transported from the urea tank to the injection point. The urea reacts with harmful nitrogen oxides in the exhaust gas to produce harmless nitrogen and water.

[0003] In the prior art, the urea supply unit includes a urea pump and a urea tank. The urea pump is located on top of the urea tank and is connected to the urea tank. The urea pump is equipped with a drive gear or a drive diaphragm. Through the mechanical movement of the drive gear or drive diaphragm, the urea solution flows from the urea tank to other components (such as a spraying device).

[0004] However, the drive gears or drive diaphragms inside the urea pump are in direct contact with the urea solution for a long time. Impurities in the urea solution (such as crystal particles, precipitates, etc.) can easily cause wear, corrosion or jamming of the drive gears or drive diaphragms, thus causing the urea pump to malfunction. Utility Model Content

[0005] This application provides a urea supply system and vehicle to solve the problem that in existing urea pumps, the drive gears or drive diaphragms are in direct contact with the urea solution, and impurities in the urea solution can easily cause wear, corrosion, or jamming of the drive gears or drive diaphragms, leading to urea pump failure.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] On one hand, this application provides a urea supply system, comprising: a container, which is disposed at the bottom of a storage tank, and has an inlet communicating with the storage tank, the inlet being located below the liquid level in the storage tank; the container also has an inlet, an outlet, an air inlet, and an exhaust outlet; an air intake assembly communicating with the air inlet; an exhaust component controlling the opening or closing of the exhaust outlet; and a spray assembly communicating with the outlet. The container is configured such that when the exhaust component opens the exhaust outlet, the container is connected to the external atmosphere through the exhaust outlet, so as to drive liquid to flow unidirectionally into the container through the inlet using a pressure difference; when the exhaust outlet is closed, and both the air inlet and the outlet are open, the air intake assembly vents air into the container to drive the liquid in the container to be sprayed out from the spray assembly through the outlet.

[0008] In one possible implementation, the urea supply system in this application embodiment includes an air intake component comprising a drive unit, a first detection unit, a second detection unit, and a first switch. The drive unit is connected to an air intake port via a pipeline to supply air to the receiving tank through the air intake port. The first switch is disposed on the pipeline connecting the drive unit and the air intake port to open or close the air intake port. The first detection unit is used to detect the air pressure of the drive unit, and the second detection unit is used to detect the air pressure of the receiving tank. When the air pressure of the drive unit is detected to be less than a first preset value, and when the air pressure of the receiving tank is detected to be less than or equal to a second preset value, the drive unit is controlled to start, and the first switch is opened.

[0009] In one possible implementation, the urea supply system in this application embodiment further includes a control unit. The first detection unit and the second detection unit are both electrically connected to the control unit. When the air pressure of the driving unit is greater than a first safety threshold, the first detection unit is controlled to issue a first abnormal signal; when the air pressure of the container is greater than a second safety threshold, the second detection unit is controlled to issue a second abnormal signal.

[0010] In one possible implementation, the urea supply system in this application embodiment includes an injection component and a second switch. The injection component is connected to the outlet via a pipeline, and the second switch is disposed on the pipeline connecting the injection component and the outlet to open or close the outlet.

[0011] In one possible implementation, the urea supply system in this application embodiment has a second switch as a pressure switch. The pressure switch is used to detect the pressure inside the container. When the pressure in the container is greater than a third preset value, it controls the outlet to open, and the liquid in the container flows out from the spray nozzle through the outlet.

[0012] In one possible implementation, the urea supply system in this application embodiment has a nozzle in the injection component, which is connected to the liquid outlet. A second switch is disposed on the pipeline connecting the nozzle and the liquid outlet. When it is necessary to purge the nozzle, the exhaust component closes the exhaust port and the second switch opens the liquid outlet. The air intake component opens to vent air into the receiving tank, and the gas is discharged from the liquid outlet to purge the nozzle with residual liquid.

[0013] In one possible implementation, the urea supply system in this application embodiment includes an exhaust solenoid valve for controlling the opening or closing of the exhaust port.

[0014] In one possible implementation, the urea supply system in this application embodiment further includes a one-way switch, which is installed on the pipeline connected to the liquid inlet so that the liquid in the storage tank flows into the receiving tank in one direction.

[0015] In one possible implementation, the urea supply system in this application embodiment uses a normally open check valve as the one-way switch.

[0016] On the other hand, this application provides a vehicle including a body and a urea supply system as described in any of the above embodiments disposed on the body.

[0017] The urea supply system and vehicle provided in this application include a receiving tank located at the bottom of a storage tank. The receiving tank has an inlet communicating with the storage tank, positioned below the liquid level. It also includes an outlet, an air inlet, and an exhaust outlet. An air intake assembly communicates with the air inlet. An exhaust assembly controls the opening and closing of the exhaust outlet. An injection assembly communicates with the outlet. During the filling phase, the exhaust assembly opens the exhaust outlet, connecting the receiving tank to the outside atmosphere. The pressure inside the receiving tank gradually decreases. When the pressure inside the receiving tank is lower than that in the storage tank, liquid enters the receiving tank through the inlet under the pressure difference and gravity. During the draining phase, the exhaust assembly closes the exhaust outlet, while both the air inlet and outlet open. The air intake assembly vents air into the receiving tank, using gas pressure to drive the liquid inside and eject it through the outlet from the injection assembly. In this application, the supply system changes the driving force of liquid flow from mechanical components (such as drive gears and drive diaphragms) to gas drive, forming a non-contact drive. The air intake assembly itself has no direct contact with the liquid, but instead, air is introduced to make the gas come into contact with the liquid, thereby driving the liquid flow through the gas. This reduces the wear of mechanical drive components and extends the service life of the urea supply system. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1 This is a schematic diagram of the urea supply system provided in an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100-Container;

[0022] 110 - Liquid inlet; 120 - Liquid outlet; 130 - Air inlet; 140 - Exhaust outlet;

[0023] 200 - Intake assembly;

[0024] 210 - Drive components;

[0025] 220 - First inspection piece;

[0026] 230 - Second inspection piece;

[0027] 240 - First switch;

[0028] 300 - Exhaust components;

[0029] 400-Injection Assembly;

[0030] 410 - Spraying parts;

[0031] 420 - Second switch;

[0032] 510 - One-way switch.

[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and are not intended to indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0036] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] During the vehicle exhaust treatment process, a urea supply unit is needed to provide urea solution, which is transported from the urea tank to the injection point. The urea reacts with harmful nitrogen oxides in the exhaust gas to produce harmless nitrogen and water.

[0039] In the prior art, the urea supply unit includes a urea pump and a urea tank. The urea pump is located on top of the urea tank and is connected to the urea tank. The urea pump is equipped with a drive gear or a drive diaphragm. Through the mechanical movement of the drive gear or drive diaphragm, the urea solution flows from the urea tank to other components (such as a spraying device).

[0040] However, the drive gears or drive diaphragms inside the urea pump are in direct contact with the urea solution for a long time. Impurities in the urea solution (such as crystal particles, precipitates, etc.) can easily cause wear, corrosion or jamming of the drive gears or drive diaphragms, thus causing the urea pump to malfunction.

[0041] In view of this, this application provides a urea supply system, comprising: a receiving tank 100, which is disposed at the bottom of a storage tank, and the receiving tank 100 is provided with a liquid inlet communicating with the storage tank, the liquid inlet being located below the liquid level in the storage tank; the receiving tank 100 is also provided with a liquid outlet, an air inlet, and an exhaust outlet; an air inlet assembly, which is communicated with the air inlet; an exhaust component, which is used to control the opening or closing of the exhaust outlet; and a spray assembly, which is communicated with the liquid outlet. During the liquid filling phase of the receiving tank 100, the exhaust component opens the exhaust outlet. When the exhaust component opens the exhaust outlet, the receiving tank 100 is connected to the external atmosphere, and the pressure value inside the receiving tank 100 gradually decreases. When the pressure value inside the receiving tank 100 is less than the pressure value inside the storage tank, the liquid enters the receiving tank 100 through the liquid inlet under the drive of the pressure difference and the action of gravity. During the liquid discharge phase of the urea tank 100, with the exhaust port closed and both the air inlet and outlet open, the air intake assembly vents air into the urea tank 100. This gas pressure drives the liquid within the tank 100, ejecting it through the outlet from the spray assembly. The mechanism driving the liquid flow is changed from mechanical components (such as drive gears and diaphragms) to gas-driven operation, creating a non-contact drive. The air intake assembly itself has no direct contact with the liquid; instead, it drives the liquid flow through air, thereby reducing wear on the mechanical drive components and extending the service life of the urea supply system.

[0042] The following is combined with Figure 1 The present application will be described in detail with reference to specific embodiments.

[0043] On one hand, this application provides a urea supply system, including: a receiving tank 100, which is disposed at the bottom of a storage tank, and has an inlet 110 communicating with the storage tank, the inlet 110 being located below the liquid level in the storage tank; the receiving tank 100 also has an inlet 110, an outlet 120, an air inlet 130, and an exhaust outlet 140; an air intake assembly 200, which communicates with the air inlet 130; and an exhaust component 300, which controls the opening or closing of the exhaust outlet 140; and a spray nozzle. The injection assembly 400 is used to communicate with the liquid outlet 120; the container 100 is configured such that when the exhaust port 140 of the exhaust component 300 is opened, the container 100 is connected to the outside atmosphere through the exhaust port 140 so as to drive the liquid to flow into the container 100 unidirectionally through the liquid inlet 110 by utilizing the pressure difference; when the exhaust port 140 is closed and both the air inlet 130 and the liquid outlet 120 are open, the air intake assembly 200 vents into the container 100 so as to drive the liquid in the container 100 to be ejected from the injection assembly 400 through the liquid outlet 120.

[0044] A receiving tank 100 is disposed at the bottom of a storage tank. The receiving tank 100 has a liquid inlet 110, a liquid outlet 120, an air inlet 130, and an air outlet 140. The liquid inlet 110 is located below the liquid surface in the storage tank. The receiving tank 100 is used to drive the liquid in the storage tank to flow into the receiving tank 100. The type of liquid in the storage tank is not limited; for example, it can be a urea solution. The liquid in the receiving tank 100 is driven by air pressure, avoiding the need for a driving component inside the receiving tank 100. This ensures that the driving component does not directly contact the urea solution, but rather drives the urea solution to the outlet 120 via air pressure. Because the liquid inlet 110 is below the liquid surface in the storage tank, the liquid in the storage tank enters the receiving tank 100 under the influence of gravity and the pressure difference between the pressure values ​​of the receiving tank 100 and the liquid in the storage tank. The container 100 is lowered to the bottom of the liquid storage tank, and the liquid inlet 110 is immersed below the liquid surface, satisfying the condition of liquid gravity flow.

[0045] The intake assembly 200 is used to communicate with the air intake port 130. Specifically, the intake assembly 200 is connected to the air intake port 130 via a pipeline. Opening or closing the air intake port 130 connects or closes the intake assembly 200 to the receiving chamber 100. The air source for the intake assembly 200 can be the vehicle's air source, entering the receiving chamber 100 through the pipeline from the air intake port 130, thus supplying air to the receiving chamber 100. Using gas as the driving source prevents driving components such as drive gears or drive diaphragms from directly contacting liquids such as urea solution. The drive system is isolated by the air passage of the intake assembly 200, ensuring that the actuators have no physical contact with the urea solution.

[0046] The vent 300 controls the opening and closing of the vent 140. The vent 300 pressurizes the containment tank 100. When the vent 300 closes the vent 140, the pressure inside the containment tank 100 is greater than the pressure of the liquid in the storage tank, preventing the liquid from entering the containment tank 100 through the inlet 110. When the vent 300 opens the vent 140, the containment tank 100 is connected to the outside atmosphere, and the pressure inside the containment tank 100 gradually decreases. When the pressure inside the containment tank 100 is less than the pressure in the storage tank, the liquid, driven by the pressure difference, enters the containment tank 100 through the inlet 110.

[0047] The intake assembly 200 and exhaust component 300 form a dual-air-path control system: the exhaust component 300 depressurizes the containment box 100, and the intake assembly 200 connects to the vehicle's air source for pneumatic drive, eliminating mechanical drive components. The driving medium is changed from mechanical components to gas, and there are no mechanical parts at the interface with the liquid, reducing wear on the mechanical drive. To ensure smooth liquid delivery, the intake of the intake assembly 200 must simultaneously overcome the reaction pressure at the injection outlet and the resistance generated by the liquid flow in the pipeline.

[0048] The injection assembly 400 is used to communicate with the liquid outlet 120. The injection assembly 400 is connected to the liquid outlet 120 through a pipeline. The liquid flowing out of the liquid outlet 120 is sprayed out from the injection assembly 400 to react with harmful nitrogen oxides in the exhaust gas.

[0049] When the exhaust port 140 of the exhaust component 300 is opened, the container 100 is connected to the external atmosphere through the exhaust port 140, so that the liquid can be driven to flow unidirectionally into the container 100 through the liquid inlet 110 using the pressure difference. When the exhaust port 140 is closed, and both the air inlet 130 and the liquid outlet 120 are open, the air intake component 200 vents air into the container 100 to drive the liquid in the container 100 to be sprayed out from the spray component 400 through the liquid outlet 120. It can be understood that this application constructs a non-contact liquid delivery system by replacing mechanical drive with air-driven pressure control. The self-filling of urea solution is achieved by utilizing the dynamic balance between the static pressure of the storage tank and the air pressure of the container 100, and directional spraying is completed by pressurizing with compressed air. This design eliminates the contact interface between moving parts and urea solution, fundamentally avoiding mechanical failure problems caused by crystal deposition and electrochemical corrosion. It should be noted that the static pressure of the storage tank refers to the pressure value when the liquid in the storage tank is at rest.

[0050] During the liquid filling stage of the container 100, the vent 300 opens the vent port 140. When the vent 300 opens the vent port 140, the container 100 is connected to the outside atmosphere, and the pressure inside the container 100 gradually decreases. When the pressure inside the container 100 is less than the pressure inside the storage tank, the liquid enters the container 100 through the inlet port 110 under the pressure difference. During the liquid draining stage of the container 100, when the vent 300 closes the vent port 140 and both the air inlet port 130 and the liquid outlet port 120 are open, the air intake assembly 200 vents into the container 100 to use gas pressure to drive the liquid inside the container 100 to be ejected from the spray assembly 400 through the liquid outlet port 120. The driving medium of the container 100 is changed from mechanical parts to gas, and the driving mechanical parts do not come into contact with the liquid, thereby reducing mechanical drive wear and extending the service life of the container 100.

[0051] In one possible implementation, the urea supply system in this embodiment includes an air intake assembly 200 comprising a drive unit 210, a first detection unit 220, a second detection unit 230, and a first switch 240. The drive unit 210 is connected to an air intake port 130 via a pipeline to supply air to the receiving tank 100. The first switch 240 is disposed on the pipeline connecting the drive unit 210 and the air intake port 130 to open or close the air intake port 130. The first detection unit 220 is used to detect the air pressure of the drive unit 210, and the second detection unit 230 is used to detect the air pressure of the receiving tank 100. When the air pressure of the drive unit 210 is detected to be less than a first preset value, and when the air pressure of the receiving tank 100 is detected to be less than or equal to a second preset value, the drive unit 210 is activated and the first switch 240 is opened.

[0052] The drive unit 210 is the air source drive for the entire vehicle. The drive unit 210 is connected to the air intake 130 through a pipeline and is used to deliver compressed gas to the housing 100. The first detection unit 220 is a pressure sensor that detects the air source pressure of the entire vehicle. If the first detection unit 220 exceeds a predetermined threshold, such as a first preset value, an air source abnormality fault is reported. The second detection unit 230 is a pressure sensor that detects whether the air pressure entering the urea pump is abnormal. If the second detection unit 230 exceeds a predetermined threshold, such as a second preset value, an intake abnormality fault is reported.

[0053] In one possible implementation, the urea supply system in this embodiment further includes a control unit. Both the first detection unit 220 and the second detection unit 230 are electrically connected to the control unit. When the air pressure of the drive unit 210 exceeds a first safety threshold, the first detection unit 220 is controlled to issue a first abnormal signal; when the air pressure in the container 100 exceeds a second safety threshold, the second detection unit 230 is controlled to issue a second abnormal signal. It should be noted that the first detection unit 220 detects the output air pressure of the drive unit 210 to keep the output air pressure within a safe range. The second detection unit 230 detects the air pressure inside the container 100 to keep the air pressure inside the container 100 within a safe range.

[0054] In one possible implementation, the urea supply system in this application embodiment includes an injection component 400 comprising an injection element 410 and a second switch 420. The injection element 410 is connected to the outlet 120 via a pipeline, and the second switch 420 is disposed on the pipeline connecting the injection element 410 and the outlet 120 to open or close the outlet 120.

[0055] The injector 410 is connected to the outlet 120 via a pipeline and is used to atomize the urea solution and inject it into the exhaust gas treatment system. The second switch 420 is located in the pipeline between the injector 410 and the outlet 120 and is used to control the opening or closing of the outlet 120. Integrating the second switch 420 and the injector 410 into the same pipeline reduces external connection points and lowers the risk of leakage.

[0056] In one possible implementation, the urea supply system in this application embodiment uses a pressure switch 420 to detect the pressure inside the container 100. When the pressure in the container 100 is greater than a third preset value, the outlet 120 is opened, and the liquid in the container 100 is sprayed out from the sprayer 410 through the outlet 120.

[0057] The second switch 420 is a pressure switch, which contains a pressure detection unit that detects the pressure signal inside the container 100. When the pressure exceeds a third preset threshold, the pressure switch opens the outlet 120. By setting the third preset value, the second switch 420 is only opened when the pressure inside the container 100 reaches the required spray pressure, thus avoiding ineffective spraying under low pressure.

[0058] In one possible implementation, the urea supply system in this application embodiment has an injection component 410 with a nozzle that is connected to a liquid outlet 120. A second switch 420 is provided on the pipeline connecting the nozzle and the liquid outlet 120. When it is necessary to purge the nozzle, the exhaust component 300 closes the exhaust port 140 and the second switch 420 opens the liquid outlet 120. The air intake component 200 opens to vent air into the receiving tank 100, and the gas is discharged from the liquid outlet 120 to purge the nozzle with residual liquid.

[0059] When it is necessary to purge the nozzle, first close the exhaust port 140 of the exhaust component 300 so that the air pressure in the container 100 is higher than the air pressure in the liquid storage tank. The liquid in the liquid storage tank cannot enter the container 100, or a small amount enters the container 100. Then, the gas from the air intake component 200 is introduced into the container 100. The flow rate of the gas is greater than the flow rate of the liquid entering the container 100, so that the gas is discharged from the liquid outlet 120 first, thereby purging the nozzle with residual liquid.

[0060] It should be noted that closing the exhaust port 140 of the exhaust component 300 first is to prevent liquid from entering the container 100, or to prevent a small amount of liquid from entering or entering the container 100 during purging.

[0061] Understandably, when purging nozzle 411 is required, exhaust component 300 closes exhaust port 140, blocking the connection between container 100 and the external atmosphere, causing the air pressure P1 inside container 100 to rise as gas is introduced through air intake component 200; when P1 rises to a level higher than the static pressure P2 of the liquid surface in the storage tank, a pressure difference ΔP = P1 - P2 > 0 is formed, inhibiting the flow of liquid from the storage tank into container 100 through inlet 110, thus blocking the flow of liquid or allowing a small amount of liquid to flow in. As air intake component 200 continues to ventilate, gas dominates the volume of container 100, and the gas flows through outlet 120 to nozzle 411, thereby pushing the residual liquid in nozzle 41 out; second switch 420 keeps outlet 120 open, allowing the gas-liquid mixture to be ejected through nozzle 411, completing the removal of residual liquid and purging of pipeline. This application creates a closed pressure environment in the containment box 100 after the exhaust port 140 is closed. By controlling the pressure difference P1>P2, the continuous inflow of liquid is suppressed, and the additional liquid dilution gas driving force is avoided during the purging process. The purging process replaces the urea solution remaining in the nozzle 411 and the injection pipeline with gas, reducing the risk of urea solution crystallization and deposition in a low-temperature environment and ensuring the smooth flow of the nozzle.

[0062] The exhaust component 300 includes an exhaust solenoid valve, which is used to control the opening or closing of the exhaust port 140.

[0063] In one possible implementation, the urea supply system in this application embodiment further includes a one-way switch 510, which is disposed on a pipeline connected to the liquid inlet 110 so that the liquid in the storage tank flows unidirectionally into the container 100.

[0064] Under the influence of gravity, the liquid in the storage tank flows unidirectionally into the receiving tank 100 via the one-way switch 510. The one-way switch 510 ensures that the liquid in the storage tank flows unidirectionally into the receiving tank 100 under gravity, preventing reverse flow of liquid or gas. When the vent 140 is opened, the receiving tank 100 is connected to the atmosphere. The static pressure of the liquid surface in the storage tank drives the liquid to flow into the receiving tank 100 via the one-way switch 510 until the liquid level reaches a preset height. The one-way switch 510, through a mechanical locking structure, ensures that the inlet 110 allows only unidirectional flow. When the air inlet assembly 200 introduces gas into the receiving tank 100, the one-way switch 510 prevents the liquid from flowing back into the storage tank; instead, the liquid flows into the outlet 120, preventing backflow of liquid or gas into the storage tank and ensuring the gas-driven effect.

[0065] Among them, the one-way switch 510 is a normally open one-way valve. The normally open one-way valve is always open in the forward direction and not open in the reverse direction. Urea can pass through in one direction by gravity. The structure of the normally open one-way valve includes a valve body, a valve core, an elastic element, and a seal: the valve body has an inlet end that communicates with the liquid storage tank, an outlet end that communicates with the container 100, and an internal flow channel; the valve core moves axially in the inner cavity of the valve body. Under normal conditions, the flow channel is opened by its own weight against the valve seat; the elastic element is pre-compressed and installed between the valve core and the top of the valve body. Its pre-tightening force is less than the self-weight of the valve core, providing reverse elastic support; the seal is located on the contact surface between the valve core and the valve seat. When the reverse pressure difference P1>P2, the valve core is driven by air pressure to move upward and compress the elastic element. The seal presses the valve seat to close the flow channel and block the backflow.

[0066] On the other hand, this application provides a vehicle including a body and a urea supply system as described in any of the above embodiments disposed on the body.

[0067] It should be noted that this application does not limit the vehicle models to which the urea supply system is applicable; it can be used in diesel engine vehicles or hybrid vehicles. Examples include heavy-duty diesel trucks (long-distance tractors, dump trucks, etc.), large buses (city buses, long-distance coaches), construction machinery (excavators, loaders, bulldozers, etc.), agricultural machinery (tractors, harvesters), and special-purpose vehicles (garbage trucks, concrete mixer trucks, etc.). This application does not limit the installation location of the supply system; it can meet the principles of the inlet 110 always being below the liquid surface, close proximity for injection, compact layout, and ease of maintenance. For example, the liquid storage tank in this application can be fixed to the bottom of the vehicle or the chassis frame, as long as the inlet 110 of the storage tank 100 is always below the liquid surface, utilizing gravity-assisted liquid intake. The injection assembly 400 can be located near the engine exhaust pipe, allowing the urea to mix thoroughly with the exhaust gas after injection.

[0068] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0069] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A urea supply system, characterized in that, include: A container is provided at the bottom of a liquid storage tank. The container is provided with a liquid inlet communicating with the liquid storage tank. The liquid inlet is located below the liquid level in the liquid storage tank. The container is also provided with a liquid inlet, a liquid outlet, an air inlet, and an exhaust outlet. An air intake assembly, the air intake assembly being used to communicate with the air intake port; An exhaust component, used to control the opening or closing of the exhaust port; A spray assembly, the spray assembly being used to communicate with the liquid outlet; The container is configured such that when the vent is opened, the container is connected to the outside atmosphere through the vent, so as to drive the liquid to flow unidirectionally into the container through the inlet using the pressure difference; when the vent is closed, and both the air inlet and the liquid outlet are open, the air intake assembly vents into the container to drive the liquid in the container to be ejected from the spray assembly through the liquid outlet.

2. The urea supply system according to claim 1, characterized in that, The air intake assembly includes a drive unit, a first detection unit, a second detection unit, and a first switch. The drive unit is connected to the air inlet via a pipeline, and the air inlet is located above the liquid level in the container. The first switch is disposed on the pipeline connecting the drive unit and the air inlet to open or close the air inlet. The first detection unit is used to detect the air pressure of the drive unit, and the second detection unit is used to detect the air pressure of the container. When the air pressure of the drive unit is detected to be less than a first preset value, and when the air pressure of the container is detected to be less than or equal to a second preset value, the drive unit is controlled to start, the first switch is opened, and the drive unit supplies air to the container.

3. The urea supply system according to claim 2, characterized in that, It also includes a control unit, wherein the first detection unit and the second detection unit are both electrically connected to the control unit. When the air pressure of the drive unit is greater than a first safety threshold, the first detection unit is controlled to issue a first abnormal signal; when the air pressure of the container is greater than a second safety threshold, the second detection unit is controlled to issue a second abnormal signal.

4. The urea supply system according to any one of claims 1-3, characterized in that, The spraying assembly includes a spraying element and a second switch. The spraying element is connected to the liquid outlet through a pipeline, and the second switch is disposed on the pipeline connecting the spraying element and the liquid outlet to open or close the liquid outlet.

5. The urea supply system according to claim 4, characterized in that, The second switch is a pressure switch, which is used to detect the pressure inside the container. When the pressure inside the container is greater than a third preset value, the liquid outlet is opened, and the liquid in the container flows out from the spray element through the liquid outlet.

6. The urea supply system according to claim 4, characterized in that, The spraying component has a nozzle that is connected to the liquid outlet. The second switch is disposed on the pipeline connecting the nozzle and the liquid outlet. When it is necessary to purge the nozzle, the exhaust component closes the exhaust port and the second switch opens the liquid outlet. The air intake component opens to vent air into the container, and the air introduced by the air intake component is discharged from the liquid outlet to purge the nozzle containing residual liquid.

7. The urea supply system according to any one of claims 1-3, characterized in that, The exhaust component includes an exhaust solenoid valve, which is connected to the exhaust port via a pipeline. The exhaust solenoid valve is used to control the exhaust port to open or close.

8. The urea supply system according to any one of claims 1-3, characterized in that, It also includes a one-way switch, which is installed on the pipeline connected to the liquid inlet so that the liquid in the storage tank flows into the container in one direction.

9. The urea supply system according to claim 8, characterized in that, The one-way switch is a normally open one-way valve.

10. A vehicle, characterized in that, It includes a body and a urea supply system according to any one of claims 1-9 disposed on the body.

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