CN215486217U

CN215486217U - Liquid inlet connecting assembly, electromagnetic valve structure and urea injection system

Info

Publication number: CN215486217U
Application number: CN202120642728.XU
Authority: CN
Inventors: 赵志强
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2022-01-11
Anticipated expiration: 2031-03-30

Abstract

The utility model relates to a liquid inlet connecting assembly, a solenoid valve structure and a urea injection system, wherein the liquid inlet connecting assembly comprises a liquid inlet connector, and the liquid inlet connector is provided with a liquid inlet channel and a liquid inlet and a liquid outlet which are respectively communicated with the liquid inlet channel; wherein, the liquid inlet joint still sets up the filter piece installing port that communicates inlet channel, and the solenoid valve structure still includes filtering the piece, filters the piece and inserts from filtering a piece installing port and locate in inlet channel and lie in between inlet and the leakage fluid dram. Above-mentioned feed liquor coupling assembling, usable filtration piece filters the impurity in the inlet channel, prevents that the impurity in the coolant liquid from getting into in the solenoid valve main part. Because filter the piece installation mouth through being independent of the inlet and establishing and insert the inlet channel in, consequently only need operate through filtering the piece installation mouth when changing the filter screen, and need not the dismouting and connect in the pipeline of inlet to the dismouting convenience of filtering the piece has been improved.

Description

Liquid inlet connecting assembly, electromagnetic valve structure and urea injection system

Technical Field

The utility model relates to the technical field of vehicle manufacturing, in particular to a liquid inlet connecting assembly, an electromagnetic valve structure and a urea injection system.

Background

With the increasing emphasis on environmental protection,the requirements of vehicle emission regulations are becoming more and more strict, and the requirements of the emission amount of NOx (nitrogen oxides) and PM (particulate matter) in the exhaust gas of diesel engines are also becoming higher and higher. In order to meet the increasing emission standards, most of the diesel engines on the market currently adopt an SCR (selective catalytic Reduction) after-treatment technology, and a urea injection system is used for reducing NOx in the tail gas into N₂And H₂O to reduce NOx emissions.

However, in a low temperature condition, urea in a urea tank for storing urea in the urea injection system is easy to freeze, and thus normal operation of the urea injection system is affected. In order to solve the problem of urea freezing, the conventional mode is that cooling liquid with higher temperature is taken out from an engine and is conveyed to a urea tank, and a heating element of the urea tank is used for further heating the cooling liquid so as to unfreeze the frozen urea.

In order to control the delivery of the coolant, a urea heating solenoid valve is provided between the engine and the urea tank to control the on/off of the coolant. However, when a large amount of impurities exist in the cooling liquid, the impurities are easily blocked in the urea heating solenoid valve, so that the flow rate of the cooling liquid flowing through the urea heating solenoid valve is small or zero, and finally the urea tank is slowly thawed or is not thawed. In order to solve the problems, the mainstream scheme in the industry at present is to install a filter screen at the water inlet end of the urea heating electromagnetic valve, wherein the filter screen can filter impurities such as iron in the cooling liquid so as to prevent the impurities from entering the urea tank and ensure the normal use of the urea injection system.

However, as the operating range increases, impurities gradually accumulate in the filter screen, further causing poor flow of the coolant, and thus the impurities in the filter screen need to be cleaned periodically. But because the structural defect of present urea heating solenoid valve leads to needing to dismantle urea heating water pipe at the in-process of washing and installation to for the change of filter screen and washing brought the inconvenience, damage the filter screen easily moreover at the in-process of dismantling the filter screen, lead to the decline of the filter capacity of filter screen.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a feed liquor coupling assembling, solenoid valve structure and urea injection system, and this feed liquor coupling assembling, solenoid valve structure and urea injection system can reach the technological effect that improves the dismouting convenience of filtering piece.

According to one aspect of the application, a liquid inlet connection assembly is provided, which comprises a liquid inlet connector, a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet connector is provided with a liquid inlet channel and a liquid inlet and a liquid outlet which are respectively communicated with the liquid inlet channel;

the liquid inlet connector is further provided with a filter piece mounting port communicated with the liquid inlet channel, the liquid inlet connecting assembly further comprises a filter piece, and the filter piece is inserted into the liquid inlet channel from the filter piece mounting port and is positioned between the liquid inlet and the liquid outlet.

In one embodiment, the filter element has a filter surface for filtering impurities, the filter surface is perpendicular to the central axis of the liquid inlet, and an orthographic projection of the liquid inlet on a plane of the filter surface at least partially coincides with the filter surface.

In one embodiment, the liquid inlet joint includes a first connection portion, a second connection portion, and a third connection portion, one end of the first connection portion, one end of the second connection portion, and one end of the third connection portion are connected to each other, the other end of the first connection portion forms the liquid inlet, the other end of the second connection portion forms the liquid outlet, and the other end of the third connection portion forms the filter mounting port.

In one embodiment, the inner wall of the third connecting portion defines two limiting grooves communicating with the filter mounting opening, the two limiting grooves are disposed opposite to each other in a radial direction of the third connecting portion, each limiting groove extends lengthwise along a central axis of the filter mounting opening, and two side edges of the filter are respectively limited in the two limiting grooves.

In one embodiment, the inlet connection assembly further comprises a sealing member detachably coupled to an end of the inlet fitting at which the filter mounting opening is provided, the sealing member being configured to seal or unseal the filter mounting opening.

In one embodiment, the sealing member is screwed with the liquid inlet joint.

In one embodiment, the inlet connection assembly further comprises a sealing ring, and the sealing ring is located between the filter element and the inlet connector.

According to another aspect of the application, a solenoid valve structure is provided, including above-mentioned feed liquor coupling assembling, the solenoid valve structure still includes the solenoid valve main part, feed liquor coupling assembling the leakage fluid dram intercommunication the solenoid valve main part.

In one embodiment, the electromagnetic valve structure further includes a heating pipe, and the heating pipe is connected to the end of the liquid inlet joint, where the liquid inlet is provided, and is in interference fit with the liquid inlet joint.

According to another aspect of the present application, a urea injection system is provided that includes the above-described inlet-coupling assembly.

Above-mentioned feed liquor coupling assembling, usable filtration piece filters the impurity in the inlet channel, prevents that the impurity in the coolant liquid from getting into in the solenoid valve main part. Because filter the piece installation mouth through being independent of the inlet and establishing and insert inlet channel in, consequently only need operate through filtering a piece installation mouth when changing and cross filtering the piece, and need not the dismouting and connect in the pipeline of inlet to the dismouting convenience of filtering the piece has been improved.

Drawings

FIG. 1 is a schematic diagram of a solenoid valve according to an embodiment of the present invention;

FIG. 2 is an exploded view of an electromagnetic valve according to an embodiment of the present invention;

the reference numbers illustrate:

100. a solenoid valve structure; 20. a solenoid valve body; 40. a liquid inlet connecting assembly; 41. a liquid inlet joint; 412. a first connection portion; 4121. a liquid inlet; 414. a second connecting portion; 416. a third connecting portion; 4161. a filter mounting port; 4163. a limiting groove; 43. a filter member; 45. a seal member; 47. a seal ring; 60. heating a tube; 80. and (5) clamping a hoop.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

FIG. 1 shows a schematic diagram of a solenoid valve configuration in one embodiment of the present invention; fig. 2 is an exploded view of the solenoid valve according to an embodiment of the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention provides a urea injection system for injecting urea to reduce nitrogen oxide emissions in automobile exhaust. The urea injection system includes a urea injection structure (not shown), a solenoid valve structure 100 and a heating pipe 60, wherein the solenoid valve structure 100 includes a solenoid valve main body 20 and a liquid inlet connection assembly 40. The heating pipe 60 is connected with the electromagnetic valve main body 20 through the liquid inlet connecting assembly 40, the electromagnetic valve main body 20 is connected with the urea injection structure, and cooling liquid output by an engine enters the urea injection structure through the heating pipe 60, the liquid inlet connecting assembly 40, the electromagnetic valve main body 20 and the like.

Further, the liquid inlet joint 41 has a liquid inlet channel, the liquid inlet channel is provided with a liquid inlet 4121 and a liquid outlet (not shown) which are communicated with each other, and the liquid inlet joint 41 is communicated with the heating pipe 60 through the liquid inlet 4121 and is communicated with the electromagnetic valve main body 20 through the liquid outlet. In this way, the coolant output from the heating pipe 60 enters the liquid inlet passage through the liquid inlet 4121, and then flows into the solenoid valve body 20 through the liquid outlet.

As described in the background art, the coolant output from the engine often contains impurities such as iron, and in order to filter the impurities, a filter screen is usually disposed in the existing electromagnetic valve structure to prevent the impurities from entering the urea tank, so as to ensure the normal use of the urea injection system. However, as impurities accumulate, the filter screen is easy to be blocked, so that the cooling liquid cannot smoothly enter the urea tank through the electromagnetic valve structure, and the filter screen needs to be replaced regularly.

In this application, in order to filter the coolant in the liquid inlet channel, the liquid inlet joint 41 is further provided with a filter mounting port 4161 communicated with the liquid inlet channel, and the electromagnetic valve structure 100 further includes a filter 43, wherein the filter 43 is inserted into the liquid inlet channel from the filter mounting port 4161 and is located between the liquid inlet 4121 and the liquid outlet.

In this way, the impurities in the liquid inlet passage can be filtered by the filter member 43, and the impurities in the coolant can be prevented from entering the solenoid valve body 20. Since the filter member 43 is inserted into the liquid inlet passage through the filter member mounting port 4161 provided independently of the liquid inlet port 4121, it is only necessary to operate through the filter member mounting port 4161 when replacing the filter member 43, and it is not necessary to disassemble and assemble the heating pipe 60 connected to the liquid inlet port 4121, thereby improving the convenience of disassembling and assembling the filter member 43.

Specifically, in some embodiments, the inlet fitting 41 includes a first connection portion 412 having a circular tubular shape, a second connection portion 414 having a circular tubular shape, and a third connection portion 416 having a circular tubular shape. One end of the first connecting portion 412, one end of the second connecting portion 414, and one end of the third connecting portion 416 are connected to each other, the other end of the first connecting portion 412 forms a liquid inlet 4121, the other end of the second connecting portion 414 forms a liquid outlet, and the other end of the third connecting portion 416 forms a filter mounting port 4161.

Preferably, the central axis of the first connecting portion 412 coincides with the central axis of the third connecting portion 416, and the central axis of the second connecting portion 414 is perpendicular to the central axes of the first connecting portion 412 and the third connecting portion 416.

Further, the inner wall of the third connecting portion 416 is formed with two limiting grooves 4163 communicating with the filter mounting port 4161 to limit the filter member 43, the two limiting grooves 4163 are oppositely disposed in a radial direction of the third connecting portion 416, and each limiting groove 4163 longitudinally extends along a central axis direction of the filter mounting port 4161.

Filter 43 and be the platelike structure of rectangle, including filtering a casing and inlaying the filter screen of locating a casing, the filter screen forms the filtering surface that is used for filtering impurity. The filter element 43 is inserted into the third connecting part 416 along the central axis direction of the liquid inlet 4121, the two side edges of the filter element 43 are respectively limited in the two limiting grooves 4163 to realize automatic fastening and positioning, the filter surface is perpendicular to the central axis of the liquid inlet 4121, and the orthographic projection of the liquid inlet 4121 on the plane of the filter surface is at least partially overlapped with the filter surface. In this manner, the flow of coolant entering the inlet passage through inlet 4121 passes through the screen and is filtered by the screen.

Further, the solenoid valve structure 100 further includes a sealing member 45 and an annular sealing ring 47. The sealing member 45 is detachably connected to the end of the third connecting portion 416, which is opened with the filter mounting opening 4161, and the sealing member 45 is used for sealing or opening the filter mounting opening 4161. The sealing ring 47 is sleeved on the third connecting portion 416 and located between the filtering member 43 and the third connecting portion 416, and the sealing ring 47 is used for sealing a gap between the sealing ring 47 and the third connecting portion 416.

Specifically, in some embodiments, the sealing member 45 is a screw nut provided with an internal thread, and the third connecting portion 416 is provided with an external thread, so that the sealing member 45 is screwed with the third connecting portion 416 and sealed by the sealing ring 47, thereby preventing the coolant from leaking from a gap between the sealing member 45 and the third connecting portion 416 while facilitating the assembly and disassembly of the sealing member 45.

In some embodiments, the solenoid valve structure 100 further includes a clamping band 80, the heating tube 60 is connected to the second connecting portion 414 and is in interference fit with the second connecting portion 414, and the clamping band 80 is sleeved at the connection position of the heating tube 60 and the first connecting portion 412 to tightly connect the heating tube 60 and the first connecting portion 412. It is understood that the connection manner of the heating tube 60 and the second connection portion 414 is not limited, and may be set as required to meet different requirements.

The assembly process of the solenoid valve structure 100 is as follows:

first, the filter member 43 is inserted into the stopper groove 4163 of the third connecting portion 416 in the central axis direction of the filter member mounting hole 4161.

Then, the seal member 45 and the seal ring 47 are attached to the third connecting portion 416 to close the filter member attachment opening 4161 to prevent the coolant from leaking.

Then, the heating pipe 60 is sleeved on the first connecting portion 412 in an interference manner to communicate with the liquid inlet 4121.

Finally, the clamp 80 is sleeved on the joint of the heating pipe 60 and the first connecting portion 412 for fastening.

The assembly and disassembly processes of the filter member 43 of the solenoid valve structure 100 are as follows:

first, the seal 45 and the packing 47 are removed.

Then, the filter member 43 is taken out in the central axis direction of the filter member mounting port 4161 to complete the cleaning or replacement of the filter member 43.

Finally, the cleaned or replaced filter member 43 is reinserted into the third connecting portion 416 through the limiting groove 4163, and the sealing member 45 and the sealing ring 47 are reinstalled.

Above-mentioned feed liquor coupling assembling 40, solenoid valve structure 100 and urea injection system, through the filtration piece installing port 4161 installation filtration piece 43 with inlet 4121 independent setting, need not dismouting heating pipe 60 and only need the independent sealing member 45 that sets up of dismouting when the dismouting filters piece 43, consequently effectively improved the convenience of filtering the piece 43 dismouting, and not fragile filtration piece 43 in the dismouting in-process, guarantee the filter capacity of filtering piece 43.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A liquid inlet connecting assembly is characterized by comprising a liquid inlet connector, wherein the liquid inlet connector is provided with a liquid inlet channel, a liquid inlet and a liquid outlet which are respectively communicated with the liquid inlet channel;

2. A feed connection assembly according to claim 1, wherein the filter element has a filter surface for filtering impurities, the filter surface being perpendicular to the central axis of the inlet port, an orthographic projection of the inlet port on a plane of the filter surface at least partially coinciding with the filter surface.

3. A feed liquor connection assembly according to claim 1, wherein the feed liquor connector comprises a first connection portion, a second connection portion and a third connection portion, one end of the first connection portion, one end of the second connection portion and one end of the third connection portion being connected to one another, the other end of the first connection portion forming the liquor inlet, the other end of the second connection portion forming the liquor discharge port, the other end of the third connection portion forming the filter mounting port.

4. A liquid inlet connecting assembly according to claim 3, wherein the inner wall of the third connecting portion defines two limiting grooves communicating with the filter mounting opening, the two limiting grooves are oppositely arranged in a radial direction of the third connecting portion, each limiting groove extends lengthwise along the central axis of the filter mounting opening, and two side edges of the filter are respectively limited in the two limiting grooves.

5. A liquid inlet connection module according to claim 1, further comprising a sealing member removably fitted to the end of the liquid inlet fitting at which the filter mounting port is provided, the sealing member being adapted to seal or unseal the filter mounting port.

6. A service coupling assembly according to claim 5, wherein the seal is threadedly connected to the service coupling.

7. A service coupling assembly according to claim 6, further comprising a sealing ring located between the filter element and the service coupling.

8. A solenoid valve structure, characterized by comprising the liquid inlet connection assembly according to any one of claims 1 to 7, and further comprising a solenoid valve body, wherein the liquid outlet of the liquid inlet connection assembly is communicated with the solenoid valve body.

9. The electromagnetic valve structure according to claim 8, characterized in that the electromagnetic valve structure further comprises a heating pipe connected to the end of the liquid inlet joint where the liquid inlet is provided and in interference fit with the liquid inlet joint.

10. A urea injection system comprising an inlet connection assembly according to any one of claims 1 to 8.