CN218971287U - Urea metering valve assembly - Google Patents

Abstract

The utility model discloses a urea metering valve assembly, which comprises: the metering valve, the outer bushing, the inner bushing, the sealing sleeve and the cooling water joint; the metering valve is sleeved in the inner bushing and is surrounded by the axial annular closed cavity, the injection front end of the metering valve is connected with or sleeved with the sealing sleeve, and the sleeving depth is smaller than the length of the sealing sleeve; the cooling water connector is communicated with the axial annular closed cavity and is used for introducing cooling water to cool the metering valve. The utility model constructs the closed cavity to surround the whole urea metering valve assembly, and the closed cavity is filled with cooling water to realize large-area heat exchange, but prevents the cooling water from directly soaking the urea metering valve, and simultaneously prevents the heat of tail gas from entering from a nozzle at the front end of the urea metering valve, thereby effectively reducing the temperature of the urea injector.

Description

Urea metering valve assembly

Technical Field

The utility model relates to the technical field of exhaust treatment of internal combustion engines, in particular to a urea metering valve assembly.

Background

In the tail gas treatment process of the internal combustion engine, urea injected by a urea injector is mixed with the discharged tail gas to react, so that the pollutant components in the tail gas are purified, and the corresponding emission standard is achieved. However, the high-temperature tail gas makes the metering valve nozzle of the urea injector bear high temperature, which easily causes crystallization failure of the urea injector, influences the tail gas treatment effect, causes air pollution and is not up to standard in emission, so that a cooling structure is usually required to be arranged for cooling the urea injector. In the prior art, as disclosed in publication number CN 107701271A, a metering injector with a spliced cooling water jacket adopts a water cooling structure, a metering injection valve is arranged in the cooling water jacket, a sealed cooling cavity is formed between the metering injection valve and the cooling water jacket, circulating cooling water is introduced into the cooling cavity, cooling water flows through the periphery of the metering injection valve, precise movement parts of the injector are wrapped in the cooling water, uneven temperature fields formed by single-side cooling and insufficient cooling are avoided, and therefore deviation and even failure of the working characteristics of the metering injection valve caused by temperature boundary conditions are avoided. However, after the cooling cavity in the prior art is filled with cooling water, the outer wall of the metering injection valve is soaked by the cooling water, the waterproof performance and the mounting tightness setting requirement of the metering injection valve are very high, and the injection front end of the metering injection valve is leveled or protruded and is directly exposed to high-temperature tail gas so as to bear high temperature. Accordingly, there is a need to provide a solution for effectively reducing the temperature of a urea injector.

Disclosure of Invention

It is an object of the present utility model to address at least the above-mentioned drawbacks and to provide at least the advantages to be described later.

The utility model further aims to provide a urea metering valve assembly, which utilizes an outer bushing, an inner bushing and a sealing sleeve to construct a closed cavity to surround the whole urea metering valve assembly, cooling water is introduced into the closed cavity to realize large-area heat exchange, the cooling water is prevented from directly soaking the urea metering valve, meanwhile, a spray head at the front end of the urea metering valve is recessed into the sealing sleeve, the influence of high-temperature tail gas on the spray head is reduced, and the urea metering valve assembly is beneficial to cooling of a urea injector.

To achieve these objects and other advantages and in accordance with the purpose of the utility model, a urea metering valve assembly is provided, comprising: the metering valve, the outer bushing, the inner bushing, the sealing sleeve and the cooling water joint;

the metering valve is sleeved in the inner bushing and is surrounded by the axial annular closed cavity, the injection front end of the metering valve is connected with or sleeved with the sealing sleeve, and the sleeved depth is shorter than the length of the sealing sleeve; the cooling water joint is communicated with the axial annular closed cavity and is used for introducing cooling water to cool the metering valve.

Preferably, in the urea metering valve assembly, the cooling water joint comprises a cooling water inlet joint and a cooling water outlet joint, the cooling water inlet joint is connected with the water inlet pipe, and the cooling water outlet joint is connected with the water outlet pipe;

wherein, the cooling water joint is internally provided with a water storage pipe, one end of the water storage pipe is communicated with a water inlet pipe or a water outlet pipe, and the other end of the water storage pipe extends into the closed cavity to a certain depth.

Preferably, in the urea metering valve assembly, the depth of the water storage pipe extending into the closed cavity is more than the radius of the closed cavity, and the part of the water storage pipe extending into the closed cavity comprises an arc-shaped pipe section.

Preferably, in the urea metering valve assembly, the arc-shaped pipe section of the water storage pipe extending into the closed cavity is tangential to the inner wall of the closed cavity or is concentrically arranged with the metering valve; or the cooling water inlet joint and the cooling water outlet joint are tangential to the outer liner.

Preferably, in the urea metering valve assembly, the cooling water inlet joint and the cooling water outlet joint are arranged at the upper half part of the outer bushing; or the arrangement positions of the cooling water inlet joint and the cooling water outlet joint are the same in height or have height difference.

Preferably, in the urea metering valve assembly, the urea metering valve further comprises a liquid inlet cap, wherein the liquid inlet cap covers the top end of the metering valve and is provided with a liquid inlet communicated with the metering valve, and liquid to be metered enters the metering valve through the liquid inlet cap.

Preferably, in the urea metering valve assembly, the outer liner is coaxially and fixedly connected with the sealing sleeve or integrally formed; the inner bushing and the sealing sleeve are coaxially and hermetically connected or integrally formed.

Preferably, in the urea metering valve assembly, after the metering valve is sleeved in the inner bushing, the outer wall of the metering valve is attached to the inner wall of the inner bushing; the injection front end of the metering valve is tightly connected with the sealing sleeve or is tightly sleeved and matched with the sealing sleeve.

Preferably, in the urea metering valve assembly, the closed cavity surrounds at least the injection front end of the metering valve to the magnet part of the metering valve.

Preferably, the urea metering valve assembly further comprises a mounting seat for being fixed to an engine, the outer liner is mounted on the mounting seat, and the metering valve is in clamping fit with the inner liner.

The utility model at least comprises the following beneficial effects:

1. according to the utility model, the outer bushing, the inner bushing and the sealing sleeve form the closed cavity capable of storing cooling water, so that high-capacity water storage is realized, the whole urea metering valve assembly is surrounded and wrapped by the closed cavity, and the metering valve assembly can be contacted with the cooling water in a large area only by sleeving and concentrating, so that large-area heat exchange is realized, and accordingly, the temperature is well reduced.

2. After the urea metering valve is matched with the inner bushing, the sealing sleeve is formed at the injection front end of the urea metering valve, namely, a sealed cavity is formed at the injection front end of the urea metering valve, the injection front end of the urea metering valve is recessed into the sealing sleeve, so that on one hand, the injection front end of the urea metering valve is far away from high-temperature tail gas, the high-temperature tail gas is prevented from directly affecting spray nozzle holes at the injection front end of the urea metering valve, on the other hand, the heat of the high-temperature tail gas is taken away by cooling water in a sealed cavity formed by the sealing sleeve, and therefore the heat is effectively prevented from being transmitted to the urea metering valve through the sealing sleeve, and the urea metering valve is facilitated to cool.

3. The sealed cavity formed by the outer bushing, the inner bushing and the sealing sleeve can prevent the outer wall of the urea metering valve from being in direct contact with cooling water, so that the cooling water is prevented from soaking the urea metering valve, the condition that the cooling water permeates into the urea metering valve to damage parts is avoided, the requirement on the tightness of the urea metering valve is lower, and the applicability is higher.

4. The water storage pipe design of the utility model ensures that the closed cavity always keeps water storage, and solves the problem that the urea metering valve can not store water when being transversely arranged.

5. The water storage pipe is arc-shaped or tangent to the closed cavity, or the cooling water joint is tangent to the outer liner, so that the introduced cooling water is accelerated to rotate in the closed cavity to form turbulent flow, the cooling water speed is increased, and the heat exchange efficiency is increased; the height difference between the cooling water inlet joint and the cooling water outlet joint can further increase the cooling effect.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic vertical cross-sectional view of a first embodiment of a urea metering valve assembly according to the present utility model;

FIG. 2 is a schematic perspective view of a first embodiment of a urea metering valve assembly according to the present utility model;

FIG. 3 is a schematic top view of a first embodiment of a urea metering valve assembly according to the present utility model;

FIG. 4 is a schematic vertical cross-sectional view of a second embodiment of a urea metering valve assembly according to the present utility model;

FIG. 5 is a schematic view of a third embodiment of a urea metering valve assembly according to the present utility model in a vertical cross-sectional configuration;

FIG. 6 is a schematic top view of a fourth embodiment of a urea metering valve assembly according to the present utility model;

FIG. 7 is a schematic diagram of cooling water flow in a fourth embodiment of a urea metering valve assembly according to the present utility model;

FIG. 8 is a schematic vertical cross-sectional view of a fifth embodiment of a urea metering valve assembly according to the present utility model;

FIG. 9 is a schematic diagram of cooling water flow in a fifth embodiment of a urea metering valve assembly in accordance with the present utility model;

FIG. 10 is a schematic view of a first embodiment of the water storage tube extending into the closed cavity according to the present utility model;

fig. 11 is a schematic view of a second embodiment of the water storage tube extending into the closed cavity.

In the figure: the liquid inlet cap 1, the metering valve 2, the metering valve injection front end 201, the metering valve magnet 202, the outer liner 3, the inner liner 4, the mounting seat 5, the sealing sleeve 6, the first sealing ring 7, the water storage pipe 8, the cooling water joint 9, the cooling water inlet joint 901, the cooling water outlet joint 902, the C-shaped clamping plate 10 and the second sealing ring 11.

Detailed Description

The present utility model is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the utility model by referring to the description.

The experimental methods described in the following embodiments are conventional methods unless otherwise indicated, and the reagents and materials are commercially available. The room temperature refers to the room temperature of 20-25 ℃.

As shown in fig. 1-5, a urea dosing valve assembly comprising: the metering valve 2, the outer lining 3, the inner lining 4, the sealing sleeve 6 and the cooling water joint 9;

the outer liner 3, the inner liner 4 and the sealing sleeve 6 form an axial annular closed cavity, the metering valve 2 is sleeved in the inner liner 4 and is surrounded by the axial annular closed cavity, the injection front end of the metering valve 2 is connected with the sealing sleeve 6 in a connecting mode comprising a terminating and sleeving way, the sleeving depth is shorter than the length of the sealing sleeve, the structure shown in fig. 1 is that the injection front end 201 of the metering valve is sleeved to a position 2-3 mm away from a bottom port of the sealing sleeve, the structure shown in fig. 4 is that the injection front end 201 of the metering valve is sleeved to a position in the middle of the sealing sleeve 6, the structure shown in fig. 5 is that the injection front end 201 of the metering valve is matched with the sealing sleeve 6 in a terminating way, when the urea metering valve assembly is mounted to an engine exhaust pipe, the matching structures can avoid the injection front end of the metering valve being directly exposed in engine exhaust gas, and fully utilize the sealing sleeve and a built sealing cavity thereof to perform heat dissipation and cooling, particularly when the terminating or sleeving depth is in the middle position (even shallower), the injection front end 201 of the metering valve is obviously pulled away from the distance of the high-temperature exhaust gas, and the sealing sleeve and the sealing cavity built by the sealing sleeve can perform heat dissipation, but when the terminating or sleeving is shallow enough, the sealing sleeve can affect the cooling effect on the metering valve, the injection front end, the metering valve, the sealing sleeve needs to affect the cooling effect the metering valve, and the corresponding metering valve and the corresponding matching structure or the corresponding matching structure to be selected according to the requirements; the cooling water joint 9 is communicated with the axial annular closed cavity, and the cooling water joint 9 is at least one inlet and one outlet and is used for introducing cooling water to cool the metering valve 2.

For easy understanding, in the illustration shown in fig. 1, the inner liner 4 and the sealing sleeve 6 are located inside the outer liner, and are preferably coaxially arranged, so that the effect that the periphery of the metering valve 2 is uniformly wrapped and surrounded by cooling water is achieved, but the metering valve can also be arranged to be different according to the needs, because the high temperature conditions born by each side surface of the metering valve assembly are different when the metering valve assembly is installed to an engine exhaust pipe, and a larger airtight space is arranged near one side of the high temperature, so that the cooling effect can be improved. The outer lining 3, the inner lining 4 and the sealing sleeve 6 can be mutually independent components, during assembly, the joint is in sealing connection, the sealing connection mode comprises welding or sealing ring and sealing gasket connection, so that a sealed cavity is not leaked, in the illustration, the joint of the inner lining 4 and the sealing sleeve 6 is provided with a first sealing ring 7, the sealing sleeve 6 and the outer lining 3 are welded and fixed at the front end, but the sealing sleeve 6 can be integrally formed with the inner lining 4, the sealing sleeve 6 can be integrally formed with the outer lining 3, and a proper composition mode can be selected according to processing requirements or market requirements.

In the structure shown in fig. 1, the inner liner 4 has a fitting space, the metering valve 2 is fitted into the inner liner 4 and is attached to the inner wall of the inner liner 4 to enable heat exchange, and the inner liner is preferably made of heat-conducting metal, such as steel materials 304 and 316; the injection front end of the metering valve 2 is butted with the inner bushing 4 in a manner of termination or sleeving, when termination is carried out, the injection front end 201 or the spray head of the metering valve 2 is aligned with the central channel of the sealing sleeve 6, when sleeving, the injection front end 2 or the spray head of the metering valve 2 is sleeved in the central channel of the sealing sleeve 6, the sleeving depth is shorter than the length of the sealing sleeve, and when the metering valve assembly is mounted to a target mounting position such as an engine exhaust pipe, liquid injected by the metering valve 2 can be sprayed into the engine exhaust pipe. The inner liner 4 is fixedly connected with the outer liner 3, and the fixed connection comprises common connection structures such as welding, threaded connection, bonding, clamping and the like, and in fig. 1, the inner liner 4 is fixedly welded with the outer liner 3.

The shapes of the outer bush 3, the inner bush 4 and the sealing sleeve 6 are set according to the needs, in the structure shown in fig. 1, the inner bush 4 is provided with a conical sleeve section, a cylindrical section, edges, folded angles and the like, which are designed according to the external shape of the metering valve and the installation and matching needs of the outer bush and the sealing sleeve, so that the assembly is convenient, and the adaptability is improved; the sealing sleeve 6 is of a round straight sleeve structure and can be matched with the inner bushing 4 and the injection front end of the metering valve 2, and the outer bushing 3 is of a sleeve structure with a large end and a small end based on the requirements of maximization of a sealing cavity and matching with a mounting seat. The structures can be formed by stamping the pipe, are beneficial to processing and manufacturing, and have low manufacturing cost.

In this embodiment, the metering valve 2 is directly assembled into the inner liner 4, the circulating cooling water is connected to the closed cavity through the cooling water connector 9, the closed cavity forms an annular axial surrounding package of the metering valve 2, heat is effectively taken away, the cooling effect on the metering valve 2 is remarkable, the design of the sealing sleeve 6 is long enough to keep the distance between the metering valve 2 and the tail gas of the engine, namely, the high temperature is kept away, the metering valve 2, particularly the injection port or the injection nozzle, is prevented from being directly exposed to the high temperature tail gas, and crystallization of the injection front end 2 or the injection nozzle of the metering valve and other parts is effectively prevented. Because the inner lining 4 is blocked, the cooling water can not soak the metering valve 2, even if the common metering valve with no sealing design or no water resistance can be directly used, the core parts of the metering valve 2, such as the controller or the metering valve magnet 202, which cannot be soaked with water, can be wrapped by the closed cavity, the wrapped area of the metering valve 2 is increased, and the heat dissipation area is larger, so that the metering valve can be rapidly and effectively cooled.

Further, in another embodiment, as shown in fig. 1 to 10, the cooling water connector 9 includes a cooling water inlet connector 901 and a cooling water outlet connector 902, the cooling water inlet connector 901 is connected to the water inlet pipe, and the cooling water outlet connector 902 is connected to the water outlet pipe;

wherein, be provided with the aqua storage pipe 8 in the cooling water joint, aqua storage pipe 8 one end intercommunication inlet tube or outlet pipe, the other end stretches into certain degree of depth in the airtight cavity.

In this embodiment, as shown in fig. 1, the water storage pipe 8 extends into the closed cavity for a certain distance (without touching the middle metering valve 2), and in fact, the depth of the water storage pipe 8 extending into the closed cavity is set according to the water storage requirement of the closed cavity, when the urea metering valve assembly is installed to the engine exhaust pipe (target installation position) of different mechanical equipment, such as a tractor, a farming machine, a transport vehicle and the like, the installation modes of vertical, inclined or horizontal transverse are usually provided, so that through the design of the water storage pipe 8, the urea metering valve assembly can keep water storage in different installation modes, the applicability of the urea metering valve assembly can be effectively improved, and the urea metering valve assembly is very important for market popularization of products. As shown in fig. 1 or 4 or 5 or 6, is in a vertically installed state of the urea dosing valve assembly; the cooling water joint and the cooling water outlet joint are arranged at the upper half part of the closed cavity shown in fig. 2, so that the aim of maximizing the water storage of the closed cavity can be fulfilled, and even if the closed cavity is arranged at the installation position shown in fig. 8 and 9, a certain water storage capacity of the closed cavity can be maintained, and the urea metering valve assembly is beneficial to cooling.

When the metering valve assembly is obliquely or horizontally arranged, the water storage pipe 8 is inserted into the closed cavity to a certain depth, so that the cooling water in the closed cavity can be prevented from flowing out completely, and the water storage is kept. The water storage is beneficial to the temperature reduction of the metering valve and avoids overheating. As shown in fig. 10 and 11, the metering valve assembly is a horizontal structure schematic, at this time, the water storage pipe 8 extends into the closed cavity, the extending depth reaches more than half the radius of the closed cavity, and even reaches or approaches the diameter of the closed cavity, so as to increase the water storage capacity of the closed cavity.

Further, in another embodiment, the depth of the water storage pipe 8 extending into the closed cavity is preferably equal to or greater than the radius of the closed cavity. As shown in fig. 10, the depth of the water storage pipe 8 extending into the closed cavity is close to the diameter of the closed cavity, and as shown in fig. 11, the depth of the water storage pipe 8 extending into the closed cavity is equal to the radius of the closed cavity. When the metering valve 1 is horizontally arranged horizontally, the water storage capacity of the closed cavity can be kept, and the maximum water storage capacity can reach more than the volume of the closed cavity.

Further, in another embodiment, as shown in fig. 10 and 11, the portion of the water storage tube 8 extending into the closed cavity has an arc-shaped tube section, that is, the water storage tube may have an arc-shaped structure as a whole or may have an arc-shaped structure as a part.

Further, in another embodiment, as shown in fig. 10 and 11, the arc-shaped pipe section of the water storage pipe extending into the closed cavity is tangential to the inner wall of the closed cavity or concentrically surrounds the metering valve; or the cooling water inlet joint and the cooling water outlet joint are tangential to the outer liner.

The arc-shaped arrangement and the tangent arrangement aim to accelerate cooling water in the closed cavity in a spiral manner, form turbulence and improve the heat dissipation and cooling effects.

In the structure shown in fig. 10 and 11, the water storage pipe combines the design of extending into the closed cavity and the arc structure, and preferably, the arc structure is a semicircular arc concentric with the closed cavity, so that the closed cavity is beneficial to keeping water storage, the introduced cooling water can be caused to rotate and accelerate in the closed cavity, turbulence is formed, the heat exchange efficiency is improved, and other arc structures can be arranged as required. As shown in fig. 6 and 7, the tangential arrangement can also make the cooling water rotationally accelerate, so that the heat exchange efficiency is improved.

Further, in another embodiment, as shown in fig. 2, the inlet cooling water joint 901 and the outlet cooling water joint 902 are both disposed at the upper half position of the outer liner 3;

or the arrangement positions of the cooling water inlet joint and the cooling water outlet joint are the same in height;

or, as shown in fig. 8 and 9, the arrangement positions of the inlet and outlet cooling water joints have a height difference.

Or, the arrangement of the water inlet pipe and the water outlet pipe, or the arrangement of the water inlet joint and the water outlet joint is not limited to the arrangement form of the water inlet joint and the water outlet joint which are in the same direction, form a certain angle, are opposite and are tangential to the outer lining.

In the present embodiment, both the cooling water inlet joint 901 and the cooling water outlet joint 902 are provided at the upper half portion of the outer liner 3, so that the water storage of the closed cavity is maximized in the vertical installation state; the arrangement of the height difference between the cooling water inlet joint 901 and the cooling water outlet joint 902 can promote the cooling water to sufficiently circulate, so that the cooling effect is improved.

Further, in another embodiment, as shown in fig. 1, the liquid inlet cap 1 is further included, the liquid inlet cap 1 covers the top end of the metering valve 2, and is provided with a liquid inlet communicated with the metering valve 2, and liquid (urea) to be metered enters the metering valve 2 through the liquid inlet cap 1. In the illustration, the top end of the metering valve is completely covered inside by the liquid inlet cap 1, the metering valve is wrapped together with the closed cavity, the bottom end of the liquid inlet cap 1 and the inner lining 4 or the outer lining 3 are fixed in a welding mode and the like, and a second sealing ring 11 is arranged inside the liquid inlet cap 1 and used for preventing liquid leakage.

Further, in another embodiment, the outer bushing is fixedly connected with the sealing sleeve coaxially or integrally formed; the inner bushing and the sealing sleeve are coaxially and hermetically connected or integrally formed. And selecting a proper processing mode according to the need.

Further, in another embodiment, as shown in fig. 1, after the metering valve 2 is sleeved into the inner liner 4, the outer wall of the metering valve is attached to the inner wall of the inner liner; the injection front end of the metering valve is tightly connected with the sealing sleeve 6 or is tightly sleeved and matched with the sealing sleeve.

Further, in another embodiment, as shown in fig. 1, the closed cavity surrounds at least the metering valve injection front to the metering valve magnet 202.

Further, in another embodiment, as shown in fig. 1, a mounting seat 5 for fixing to an engine is further included, the outer liner 3 is mounted on the mounting seat, and the metering valve 2 is in snap fit with the inner liner 4. In the illustration, the metering valve 2 is secured to the inner liner 4 by a C-clamp.

Example 1

As shown in fig. 1 to 11, a urea metering valve assembly is disclosed, wherein an outer liner 3, an inner liner 4 and a sealing sleeve 6 form a large-area axial annular closed cavity, a cooling water joint 9 can be divided into one inlet and one outlet, engine cooling water can be led into the closed cavity through the cooling water joint 9 to form cooling water circulation, the urea metering valve 2 is arranged in a cavity surrounded by the closed cavity, a magnet of the urea metering valve 2 is attached to the inner liner inner wall in the cavity, a front-section spray head of the urea metering valve 2 is attached to the inner liner inner wall of the sealing sleeve 6 (the inner liner and the sealing sleeve can be designed into a whole), and large-capacity cooling water is formed to integrally surround the urea metering valve 2, so that large-area and efficient heat dissipation and cooling of the urea metering valve are realized. The clamping groove is reserved on the urea metering valve 2, the urea metering valve 2 is fixed on the inner bushing 4 through the c-shaped clamping plate 10, the liquid inlet cap 1 is connected with the urea metering valve 2, liquid enters the urea metering valve 2 through the liquid inlet cap 1, and the urea metering valve 2 performs quantitative injection. The water storage pipe 8, one end of the water storage pipe 8 is positioned in the cooling water joint 9, the other end of the water storage pipe 8 is positioned in the closed cavity, the distance extending into the closed cavity is most preferably more than the radius of the closed cavity, so that the closed cavity always keeps water storage when the urea metering valve is transversely installed, the part of the water storage pipe 8 extending into the closed cavity can be arc-shaped or straight or the two parts are combined, and the water storage pipe 8 is not contacted with the metering valve 2.

The cooling water pipe connected with the cooling water joint 9 is divided into a water inlet pipe and a water outlet pipe, and the following setting modes can be selected: (1) as shown in fig. 2, the water inlet pipe and the water outlet pipe are positioned at the upper half part of the outer bushing, so that the water storage of the closed cavity is maximized; (2) as shown in fig. 8 and 9, the water inlet pipe and the water outlet pipe form a height difference, turbulence is formed in the closed cavity, and the large-area heat exchange is realized by combining the large-area contact cooling water of the urea metering valve 2; (3) as shown in fig. 6 and 7, the water inlet pipe and the water outlet pipe are tangential to the outer liner, the cooling water forms turbulence in the closed cavity, the cooling water speed is increased, and the great cooling is realized; (4) in addition, the arrangement of the water inlet pipe and the water outlet pipe is not limited to the arrangement form that the water inlet pipe and the water outlet pipe are in the same direction, form a certain angle, are opposite and are tangential to the outer lining.

The mounting seat 5, the outer liner 3 is installed on the mounting seat 5, and the urea metering valve 2 is fixed on the engine through the mounting seat 5 to realize injection. The first sealing ring 7 and the second sealing ring 11 play a role in sealing.

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art.

Claims (10)

1. The urea metering valve assembly, characterized by includes: the metering valve, the outer bushing, the inner bushing, the sealing sleeve and the cooling water joint;

the metering valve is sleeved in the inner bushing and is surrounded by the axial annular closed cavity, the injection front end of the metering valve is connected with or sleeved with the sealing sleeve, and the sleeved depth is shorter than the length of the sealing sleeve; the cooling water joint is communicated with the axial annular closed cavity and is used for introducing cooling water to cool the metering valve.

2. The urea metering valve assembly of claim 1, wherein the cooling water connector comprises a cooling water inlet connector and a cooling water outlet connector, the cooling water inlet connector is connected with the water inlet pipe, and the cooling water outlet connector is connected with the water outlet pipe;

wherein, the cooling water joint is internally provided with a water storage pipe, one end of the water storage pipe is communicated with a water inlet pipe or a water outlet pipe, and the other end of the water storage pipe extends into the closed cavity to a certain depth.

3. The urea metering valve assembly of claim 2, wherein the depth of the water storage tube extending into the closed cavity is the radius of the closed cavity and above, and the portion of the water storage tube extending into the closed cavity comprises an arcuate tube segment.

4. A urea metering valve assembly as claimed in claim 3 wherein the arcuate tube section of the reservoir extending into the closed chamber is tangential to the inner wall of the closed chamber or concentric with the metering valve; or the cooling water inlet joint and the cooling water outlet joint are tangential to the outer liner.

5. The urea dosing valve assembly of claim 2, wherein the inlet and outlet cooling water fittings are disposed in an upper half of the outer liner; or the arrangement positions of the cooling water inlet joint and the cooling water outlet joint are the same in height or have height difference.

6. The urea metering valve assembly of claim 1, further comprising a liquid inlet cap covering the top end of the metering valve and having a liquid inlet opening communicating to the metering valve through which liquid to be metered enters the metering valve.

7. The urea metering valve assembly of claim 1, wherein the outer bushing is fixedly connected coaxially or integrally formed with the sealing sleeve; the inner bushing and the sealing sleeve are coaxially and hermetically connected or integrally formed.

8. The urea metering valve assembly of claim 1 wherein the metering valve outer wall conforms to the inner liner inner wall after the metering valve is nested within the inner liner; the injection front end of the metering valve is tightly connected with the sealing sleeve or is tightly sleeved with the sealing sleeve.

9. The urea dosing valve assembly of claim 1, wherein the closed cavity encloses at least the dosing valve injection front to the dosing valve magnet region.

10. The urea metering valve assembly of claim 1, further comprising a mount for securing to an engine, the outer liner being mounted on the mount, the metering valve being in snap-fit engagement with the inner liner.

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