EGR cooling pipe connection structure
By adopting the engineering plastic pipeline connection structure, using bolt fixation and O-ring sealing, the problems of deformation, poor sealing and high cost of cooling water pipe structure materials in the prior art are solved, and simple and reliable connections are achieved, reducing the risk of damage and improving safety.
Patent Information
- Application Number
- CN202421295704.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-07
AI Technical Summary
The cooling water pipe structure of the existing hot-end electric EGR valve uses bent steel pipes or cast steel pipes, which has problems such as material deformation, poor sealing, high cost and difficulty in dismantling.
The engineering plastic pipe connection structure is adopted, fixed by bolts and sealed by O-rings, and the adhesive is eliminated. The design connection joint has grooves and mounting ears embedded in the O-ring, fixed with screws, and limit steps and anti-slip facilities are set on the joint.
It realizes a simple and reliable connection between the hose and the valve body, reducing the risk of damage from installation and disassembly, with low cost, wide applicability, strong sealing and high safety factor.
Smart Images
Figure CN222716985U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an EGR cooling pipeline connection structure, which is a structure used by automobile engine accessories and a pipeline connection structure used by engine environmental protection facilities. Background Art
[0002] EGR valves are divided into two types: cold end and hot end. Since the hot end EGR valve is in direct contact with the high-temperature engine exhaust gas, it is necessary to cool the valve body through circulating cooling water, and separate the high-temperature gas channel from the valve seal and electrical structure to avoid high temperature affecting or even damaging the mechanical and electrical structure. Therefore, it is necessary to introduce external coolant into the valve body cooling water channel. Because the coolant temperature is relatively low, a hose is generally used as a water supply channel, and a connecting joint is installed on the valve body to connect with the hose. The cooling water pipe structure assembled on the valve body of the existing hot end electric EGR valve is generally connected by a bent steel pipe or a cast steel pipe. When the steel pipe is assembled with the hose, a layer of high-temperature resistant surface sealant is applied on the mating surface, and then the steel pipe is pressed into the valve body. After the sealant is cured, a fixed connection is achieved. However, the bent steel pipe is generally a thin-walled pipe. When the material is deformed during bending, the straight section is also affected, resulting in insufficient roundness of the pipe. At the same time, the steel pipe and the valve body have an interference fit, which is easy to be pressed and deformed, affecting the sealing performance. In addition, a certain bending radius is required when the steel pipe is bent, otherwise the process cannot be achieved, limiting the scope of use. The cast steel pipe has thick wall and heavy weight. Generally, there is no problem with reliability, but it does not conform to the lightweight design concept. At the same time, the appearance connection part needs to be machined to ensure accuracy, which is costly. Both structures need to be sealed with high-temperature resistant sealant. It is difficult to disassemble after sealing problems occur, and the valve body and parts are greatly damaged after disassembly. How to solve the simple and reliable connection between the hose and the valve body is a problem that needs to be solved. Summary of the invention
[0003] In order to overcome the problems of the prior art, the utility model proposes an EGR cooling pipe connection structure. The connection structure adopts an engineering plastic pipe, and is fixed with bolts and sealed with an O-ring. No glue is used between the hose and the connection joint, making the overall structure simple, easy to install, and not easy to damage.
[0004] The purpose of the utility model is achieved as follows: an EGR cooling pipeline connection structure, comprising: a connecting joint with one end inserted into the water inlet of a valve body, the other end of the connecting joint inserted into the hose, the portion of the connecting joint inserted into the valve body is provided with a groove for embedding an O-ring, the exposed portion of the connecting joint inserted into the valve body is provided with a mounting ear, the mounting ear is provided with a mounting hole for fixing the connecting joint and a screw that passes through the mounting hole and is connected to the valve body.
[0005] Furthermore, a limiting step is provided on the exposed portion of the connecting joint inserted into the hose.
[0006] Furthermore, the portion of the connecting joint that is inserted into the hose is provided with a facility to prevent the hose from slipping off.
[0007] Furthermore, the device for preventing the hose from slipping off is an annular protrusion.
[0008] Furthermore, the connecting joint is in a broken line shape, that is, the angle between the rotation center line of the part of the connecting joint inserted into the valve body and the rotation center axis of the part inserted into the hose is less than 180 degrees.
[0009] Furthermore, the connecting joint is in a broken line shape, that is, the angle between the rotation center line of the part of the connecting joint inserted into the valve body and the rotation center axis of the part inserted into the hose is 90 degrees.
[0010] The advantages and beneficial effects of the utility model are as follows: the main body of the connection structure described in the utility model is made of engineering plastics and adopts injection molding technology, which is suitable for mass production and low cost. A sealing groove is set on the connection joint, and the O-ring is assembled in the sealing groove. A screw hole for fixing is set on the joint, and the joint equipped with the O-ring is pressed into the valve body mounting hole, and then tightened with screws to prevent it from falling off. The advantage of the structure of the utility model is that the connection joint is made of high-strength engineering plastics, and the injection molding process is formed in one step. Various structures can be designed according to needs, which has a wider applicability, and the injection molding production efficiency is high, the appearance is smooth and beautiful, and the O-ring is used for sealing. It does not require a particularly high matching accuracy with the inner hole of the valve body. Injection molding can ensure the size requirements without adding new processing steps. The O-ring uses national standard products, which are easy to obtain, and is fixed with screws, which is easy to disassemble and replace, will not damage the parts, has strong pressure bearing capacity, and a high safety factor. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0012] Figure 1 It is a schematic diagram of the connection structure described in Embodiments 1, 2, 3, 5 and 6 of the present utility model;
[0013] Figure 2 is a schematic diagram of the connection structure described in Embodiments 1, 2 and 3 of the present invention, Figure 1 Center A view. DETAILED DESCRIPTION
[0014] Embodiment 1:
[0015] This embodiment is an EGR cooling pipe connection structure. Figure 1 , 2This embodiment includes: a connection joint 2 with one end inserted into the water inlet 101 of the valve body 1, the other end of the connection joint is inserted into the hose 3, the portion of the connection joint inserted into the valve body is provided with a groove 201 for embedding the O-ring 4, the exposed portion of the connection joint inserted into the valve body is provided with a mounting ear 202, the mounting ear is provided with a mounting hole for fixing the connection joint and a screw 5 passing through the mounting hole and connected to the valve body.
[0016] This embodiment replaces the traditional metal pipe joint with an engineering plastic joint, and makes corresponding adjustments to the specific structure, provides mounting ears and screws for installation and fixation, and uses O-rings for sealing. The mounting ears also have the function of limiting the insertion depth, making the installation regular.
[0017] Since the connecting joint is engineering plastic and can be injection molded, it is very convenient to set up facilities such as steps. A limiting annular step can also be set at the part of the connecting joint where the hose is inserted, so that the length of the inserted hose is also regularized.
[0018] In order to make the connecting joint inserted into the hose more firmly, some facilities for preventing the hose from slipping off, such as a protruding annular step, can be provided at the end of the connecting joint where the hose is inserted.
[0019] For the installation environment of the EGR system, the connecting joint can be a straight pipe or a curved pipe, such as Figure 1 , 2 Bend it 90 degrees like that.
[0020] Embodiment 2:
[0021] This embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment regarding the exposed portion of the connecting joint inserted into the hose. The exposed portion of the connecting joint inserted into the hose in this embodiment is provided with a limiting step 203, such as Figure 1 , 2 shown.
[0022] The length of the connecting joint inserted into the hose should not be too long or too short. Setting a limit step on the connecting joint can solve the problem of the length limitation of the inserted hose.
[0023] Embodiment three:
[0024] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the part of the connecting joint inserted into the hose. The part of the connecting joint inserted into the hose described in this embodiment is provided with a facility to prevent the hose from slipping off.
[0025] There are many ways to prevent the rubber hose from slipping. An annular protrusion or a groove can be set at the end of the connecting joint. When the groove is used, it can be matched with a pipe clamp.
[0026] Embodiment 4:
[0027] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the facility for preventing the rubber hose from slipping off. The facility for preventing the rubber hose from slipping off described in this embodiment is an annular protrusion.
[0028] The annular protrusion may be provided in one or more rows.
[0029] Embodiment five:
[0030] This embodiment is an improvement of the above embodiment and a refinement of the above embodiment regarding the connection joint. The connection joint described in this embodiment is in the shape of a broken line, that is, the angle between the rotation center line 205 of the part of the connection joint inserted into the valve body and the rotation center axis 206 of the part inserted into the hose is α Less than 180 degrees, such as Figure 1 shown.
[0031] Since the pipe fittings are all rotating bodies, the centerline of rotation is the extension line of the pipe. The key is the connection joint, which has a centerline of rotation. In this embodiment, the connection joint is divided into two parts, one part is inserted into the valve body and connected to the water outlet, and the other part is inserted into the hose. If the centerlines of rotation of the two parts are collinear, the connection joint is a straight pipe. In actual applications, in order to adapt to the installation environment, the connection joint is usually designed as a curved pipe, that is, the centerlines of rotation of the two parts are not collinear, but have a certain angle, such as 30 degrees, 90 degrees, etc.
[0032] Embodiment six:
[0033] This embodiment is an improvement of the above embodiment and is a refinement of the above embodiment regarding the connection joint. The connection joint described in this embodiment is in a broken line shape, that is, the rotation center line of the part of the connection joint inserted into the valve body and the rotation center axis of the part inserted into the hose are at a 90-degree angle. Figure 1 shown.
[0034] The rotation center line of the portion of the connecting joint of this embodiment that is inserted into the valve body forms a right-angle turn with the portion that is inserted into the hose.
[0035] Finally, it should be noted that the above is only used to illustrate the technical solution of the utility model and is not a limitation. Although the utility model has been described in detail with reference to the preferred arrangement scheme, ordinary technicians in the field should understand that the technical solution of the utility model (such as the form of the EGR valve, the form of the connecting hose and the type of engineering plastics used, etc.) can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.
Claims
1. An EGR cooling pipe connection structure, comprising: One end of a connecting joint is inserted into the water outlet of a valve body, and the other end of the connecting joint is inserted into a hose. The connecting joint is characterized in that the portion of the connecting joint inserted into the valve body is provided with a groove for embedding an O-ring, and the exposed portion of the connecting joint inserted into the valve body is provided with a mounting ear, and the mounting ear is provided with a mounting hole for fixing the connecting joint and a screw that passes through the mounting hole and is connected to the valve body.
2. The pipeline connection structure according to claim 1, characterized in that: The exposed part of the connecting joint inserted into the hose is provided with a limiting step.
3. The pipeline connection structure according to claim 2, characterized in that: The part of the connecting joint inserted into the hose is provided with a facility to prevent the hose from slipping off.
4. The pipeline connection structure according to claim 3, characterized in that: The device for preventing the rubber hose from slipping off is an annular protrusion.
5. The pipeline connection structure according to any one of claims 1 to 4, characterized in that: The connecting joint is in a broken line shape, that is, the angle between the rotation center line of the part of the connecting joint inserted into the valve body and the rotation center axis of the part inserted into the hose is less than 180 degrees.
6. The pipeline connection structure according to claim 5, characterized in that: The connecting joint is in a broken line shape, that is, the angle between the rotation center line of the part of the connecting joint inserted into the valve body and the rotation center axis of the part inserted into the hose is 90 degrees.