Plastic EGR valve
By integrating the plastic housing and bushing through injection molding and employing an anti-detachment structure, the corrosion, leakage, and complex assembly issues of the EGR valve have been resolved, enabling stable connection and efficient production.
Patent Information
- Application Number
- CN202520075335.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2035-01-14
AI Technical Summary
Existing EGR valves are susceptible to corrosion, which can lead to valve jamming and leakage. The assembly process is complex and there is a risk of valve seat detachment.
The system uses a plastic housing and bushing, with components such as gear pins and valve seats integrally injection molded. Anti-detachment structures are installed on these components, and the assembly process is simplified and the connection stability is improved by welding together the sealing ring and the plastic heat insulation cover.
It effectively prevents valve jamming and leakage caused by corrosion, simplifies the assembly process, reduces costs and improves production efficiency, prevents valve seat detachment, and enhances connection stability.
Smart Images
Figure CN223523849U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to EGR valve technical field, specifically refers to a kind of plastic EGR valve. BACKGROUND
[0002] Waste recirculation valve is also called EGR valve, it is by introducing part of exhaust gas into intake system, with fresh air or mixed gas to enter cylinder combustion again, reduce the temperature and pressure of combustion chamber, reduce NOx generation, improve engine efficiency, protect engine and improve fuel efficiency. With the gradual maturity of hybrid application, more condensate water is generated after engine combustion, and the application of non-standard gasoline and engine oil repeatedly forbidden in the market puts forward higher requirements for the corrosion resistance of existing EGR valve.
[0003] The current EGR valve includes a housing, an installation cavity and a passage are provided in the housing, the housing is an aluminum housing, a gear pin is arranged in the installation cavity and connected with the housing by interference press fitting, a sealing ring, a copper bushing and a metal heat shield are sequentially arranged in a guide area in the passage from top to bottom, a valve seat is interference press fitted in the passage and fixed with the housing by riveting process, and a motor support is fixedly connected with the housing by metric screw and located in the installation cavity.
[0004] The problem of the above-mentioned EGR valve is that:
[0005] 1. The EGR exhaust gas can form an acidic environment in the airway, as the housing is an aluminum housing, it cannot cope with the corrosion problem of the airway, and corrosion can cause valve jamming and leakage problems;
[0006] 2. There are many parts to be installed in the housing, which leads to a complex assembly process and affects production efficiency;
[0007] 3. The sealing ring is located at the upper end of the copper bushing, so that the corrosive substances or carbon deposits in the housing can easily enter the copper bushing, thereby causing valve jamming;
[0008] 4. The riveting process fixes the valve seat on the housing by rivet points, and due to the thermal expansion of the housing, there is a risk of valve seat falling off. UTILITY MODEL CONTENTS
[0009] In view of the deficiencies of the prior art, the utility model aims to provide a plastic EGR valve to solve the technical problems that the existing EGR valve is prone to valve jamming and leakage due to corrosion, the assembly process is complex, and there is a risk of valve seat falling off.
[0010] To solve the above technical problems, the utility model provides a kind of plastic EGR valve, including plastic shell, gear pin, plastic bushing and valve seat, plastic shell bottom end is equipped with passageway, passageway upper end is connected and is equipped with the installation cavity in plastic shell interior upper end, gear pin is equipped in installation cavity, plastic bushing is equipped in passageway inner wall, valve seat is equipped in passageway inner wall and is located plastic bushing below, gear pin, plastic bushing and valve seat are as insert and integrally injection moulded with plastic shell, gear pin, plastic bushing and valve seat all are equipped with the anti -drop structure for preventing from dropping from plastic shell.
[0011] After adopting above structure, the utility model a kind of plastic EGR valve has following advantages: shell is changed from aluminum structure to plastic structure, bushing is also changed from copper structure to plastic structure, to prevent valve stagnation, leakage caused by shell corrosion, reduce cost, and gear pin, plastic bushing and valve seat are as insert and integrally injection moulded with plastic shell, so the assembly steps of these key components are saved, assembly process is simplified, production efficiency is improved, on this basis, anti -drop structure is set on gear pin, plastic bushing and valve seat, prevent component and plastic shell from separating, and valve seat and plastic shell integrally injection moulded are combined with its anti -drop structure, valve seat can also be prevented from dropping due to thermal expansion of plastic shell.
[0012] As an improvement, the anti-drop structure on the valve seat includes a plurality of limiting holes, each limiting hole is arranged on the valve seat along the axial direction of the valve seat, and the plurality of limiting holes are distributed along the circumferential direction of the valve seat. An annular groove is arranged on the inner wall of the passageway, the valve seat is arranged in the annular groove, and all the limiting holes are located in the annular groove. A plurality of limiting columns are arranged in the limiting holes in the annular groove. With this structure, the limiting holes arranged on the valve seat are filled with material during the injection molding of the plastic shell, forming limiting columns to radially limit the valve seat, preventing the valve seat from moving radially and loosening under the condition of high-temperature expansion of the plastic shell.
[0013] As an improvement, the anti-drop structure on the valve seat includes an annular limiting groove arranged on the outer side wall of the valve seat, and a limiting ring arranged in the annular limiting groove on the inner wall of the passageway. With this structure, the annular limiting groove on the valve seat is filled with material during the injection molding of the plastic shell, forming a limiting ring to axially limit the valve seat, preventing the valve seat from moving axially and loosening under the condition of high-temperature expansion of the plastic shell. At the same time, the linear length of the contact between the valve seat and the plastic shell is increased, effectively preventing leakage of the air path at this point.
[0014] As an improvement, the anti-drop structure on the gear pin is knurling arranged on the outer wall of one end of the gear pin. With this structure, the stability of the connection between the gear pin and the plastic shell is improved, and there is no risk of falling off due to heat.
[0015] As an improvement, the anti-falling structure on the plastic bushing is a plurality of convex strips arranged on the outer wall of the plastic bushing and distributed circumferentially along the outer wall of the plastic bushing; by adopting this structure, the stability of the connection between the plastic bushing and the plastic shell is improved, and there is no risk of falling due to heat.
[0016] As an improvement, the inner wall of the channel is further provided with a sealing ring and a plastic heat shield, and the sealing ring and the plastic heat shield are sequentially arranged below the plastic bushing from top to bottom; by arranging the sealing ring at the lower end of the plastic bushing, the risk of valve jamming is reduced.
[0017] As an improvement, the plastic heat shield is connected with the plastic shell by welding; by adopting this structure, the plastic heat shield can prevent corrosion and reduce cost, and since the sealing ring also needs to be arranged in the plastic heat shield, the plastic heat shield cannot be integrally injection molded in the plastic shell, and the plastic heat shield cannot be fixed to the plastic shell by interference fit or riveting, therefore, welding can ensure the stability of the connection between the plastic heat shield and the plastic shell, and prevent the plastic heat shield from falling off.
[0018] As an improvement, the sealing ring has two upper and lower sealing rings, a skeleton is arranged between the two sealing rings, and a through hole communicating with the channel is arranged on the side wall of the plastic shell corresponding to the skeleton; by adopting this structure, if the upper sealing ring fails, the lower sealing ring can still play a sealing role, if the lower sealing ring fails, the exhaust gas can be discharged to the external environment through the through hole instead of entering the installation cavity, and corrosion is prevented. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a sectional view of the utility model.
[0020] Figure 2 It is Figure 1 It is a local enlarged view of A part in the middle.
[0021] Figure 3 It is a structure schematic view of the plastic shell part in the utility model.
[0022] Figure 4 It is Figure 3 It is a local enlarged view of B part in the middle.
[0023] Figure 5 It is a structure schematic view in the installation cavity in the utility model.
[0024] Figure 6 It is a structure schematic view of the shell part under another angle in the utility model.
[0025] Figure 7 It is a structure schematic view of the valve rod part in the utility model.
[0026] Fig. 1 is a plastic shell; 2 is a gear pin; 3 is a plastic bushing; 4 is a valve seat; 5 is a channel; 6 is a mounting cavity; 7 is a limiting hole; 8 is an annular groove; 9 is a limiting column; 10 is an annular limiting groove; 11 is a limiting ring; 12 is a convex strip; 13 is a sealing ring; 14 is a plastic heat shield; 15 is a motor support; 16 is a self-tapping screw; 17 is a framework; 18 is a through hole; 19 is a valve stem. DETAILED DESCRIPTION
[0027] The utility model discloses a plastic EGR valve is specifically as follows.
[0028] As shown in the drawings, Figures 1 to 7 A plastic EGR valve comprises a plastic shell 1, a gear pin 2, a plastic bushing 3 and a valve seat 4, the bottom end of the plastic shell 1 is provided with a channel 5, the upper end of the channel 5 is communicated with a mounting cavity 6 arranged at the upper end inside the plastic shell 1, a valve stem 19 is arranged in the channel 5, the gear pin 2 is arranged in the mounting cavity 6, the plastic bushing 3 is arranged on the inner wall of the channel 5, the valve seat 4 is arranged on the inner wall of the channel 5 and below the plastic bushing 3, and this part of structure is prior art, which will not be repeated here; the gear pin 2, the plastic bushing 3 and the valve seat 4 are integrally injection molded with the plastic shell 1 as inserts, and the gear pin 2, the plastic bushing 3 and the valve seat 4 are all provided with anti-falling structures for preventing falling from the plastic shell 1.
[0029] As shown in the drawings, Figure 1 And Figure 2 The anti-falling structure on the valve seat 4 comprises a plurality of limiting holes 7, each limiting hole 7 is arranged on the valve seat 4 along the axial direction of the valve seat 4, and the axial direction of the valve seat 4 is the axial direction of the valve stem 19, in the embodiment, the limiting holes 7 are arranged on the upper end face of the valve seat 4, and the plurality of limiting holes 7 are distributed along the circumferential direction of the valve seat 4, preferably equidistantly distributed in the circumferential direction, an annular groove 8 is arranged on the inner wall of the channel 5, the valve seat 4 is arranged in the annular groove 8 so that all the limiting holes 7 are located in the annular groove 8, and a plurality of limiting columns 9 located in the limiting holes 7 are arranged in the annular groove 8.
[0030] In addition, as shown in the drawings, Figure 2 The anti-falling structure on the valve seat 4 further comprises an annular limiting groove 10, the annular limiting groove 10 is arranged on the outer side wall of the valve seat 4, and a limiting ring 11 located in the annular limiting groove 10 is arranged on the inner wall of the channel 5, specifically, since the outer ring part of the valve seat 4 is arranged in the annular groove 8, the limiting ring 11 is actually formed on the inner wall of the annular groove 8 in the channel 5.
[0031] As shown in the drawings, Figure 3 And Figure 4 The anti-falling structure on the plastic bushing 3 is a plurality of convex strips 12 arranged on the outer wall of the plastic bushing 3 and distributed along the circumferential direction of the outer wall of the plastic bushing 3, preferably equidistantly distributed in the circumferential direction, and the anti-falling structure on the gear pin 2 is a knurl arranged on the outer wall of one end of the gear pin 2.
[0032] The utility model discloses a shell is changed from aluminium structure to plastic structure, bushing is also changed from copper structure to plastic structure to prevent the valve from sticking, leakage caused by shell corrosion, reduced cost, and gear pin 2, plastic bushing 3 and valve seat 4 are all as insert and integral injection molding with plastic shell 1, therefore, the assembly step of these key parts is saved, the assembly process is simplified, and the production efficiency is improved, wherein, gear pin 2 and valve seat 4 select the material to be stainless steel, and plastic bushing 3 and plastic shell 1 are all PPS, on this basis, all be provided with anti -drop structure on gear pin 2, plastic bushing 3 and valve seat 4, prevent the separation of parts and plastic shell 1, and valve seat 4 and plastic shell 1 integral injection molding combine its anti -drop structure, valve seat 4 can also prevent the drop due to the thermal expansion of plastic shell 1.
[0033] Specifically, the limiting hole 7 and annular limiting groove 10 provided on the valve seat 4 are filled with material into the limiting hole 7 and annular limiting groove 10 to form the limiting column 9 and limiting ring 11 respectively during the injection molding of the plastic shell 1, the limiting hole 7 can limit the valve seat 4 in the radial direction to prevent the valve seat 4 from moving in the radial direction under the condition of high-temperature expansion of the plastic shell 1, and the annular limiting groove 10 limits the valve seat 4 in the axial direction to prevent the valve seat 4 from moving in the axial direction under the condition of high-temperature expansion of the plastic shell 1, thereby preventing the valve seat 4 from loosening, and the annular limiting groove 10 increases the linear length of the contact between the valve seat 4 and the plastic shell 1 to effectively prevent the leakage of the air path at this position; the anti-drop principle of the convex strip 12 and the knurl is the same as that of the limiting hole 7 and the annular limiting groove 10, and the stability of the connection between the gear pin 2, the plastic bushing 3 and the plastic shell 1 is improved, and there is no risk of falling off under the heating.
[0034] As shown in Figure 5 , the mounting cavity 6 is provided with a motor support 15, the motor support 15 is in interference fit with the inner wall of the mounting cavity 6, the motor support 15 is fixedly connected with the plastic shell 1 through self-tapping nails 16, the stability of the connection between the motor support 15 and the plastic shell 1 is improved, the radial movement of the motor is prevented, and the self-tapping nails 16 are selected, so that there is no need to provide a threaded insert on the plastic shell 1, the cost is reduced, and the structure is simplified.
[0035] As shown in Figure 1 and Figure 7As shown in the drawings, the inner wall of the channel 5 is further provided with a sealing ring 13 and a plastic heat shield 14, which are sequentially arranged below the plastic bushing 3 from top to bottom, so as to prevent the carbon deposition from entering the plastic bushing 3 and reduce the risk of valve sticking; wherein the plastic heat shield 14 is connected with the plastic shell 1 by welding, and the plastic heat shield 14 can prevent corrosion and reduce the cost, and since the sealing ring 13 needs to be arranged in the plastic heat shield 14, the sealing ring 13 cannot be integrally injection molded with the plastic shell 1, so the plastic heat shield 14 also cannot be integrally injection molded in the plastic shell 1, and the plastic heat shield 14 cannot be fixed to the plastic shell 1 by interference fit or riveting, therefore, the welding is selected to ensure the stability of the connection between the plastic heat shield 14 and the plastic shell 1, prevent the plastic heat shield 14 from falling off, and the specific welding method is the prior art, which will not be described here.
[0036] As shown in the drawings, Figure 1 and Figure 7 As shown in the drawings, the sealing ring 13 is two, and a skeleton 17 is arranged between the two sealing rings 13, and the plastic bushing 3, the sealing ring 13 and the plastic heat shield 14 are all sleeved on the valve rod 19, wherein the plastic bushing 3 is used as a sliding bearing; the plastic shell 1 is provided with a through hole 18 corresponding to the skeleton 17 and communicating with the channel 5, if the upper sealing ring 13 fails, the lower sealing ring 13 can still play a sealing role, if the lower sealing ring 13 fails, the exhaust gas can be discharged to the outside environment from the through hole 18 instead of entering the installation cavity 6, so as to prevent corrosion.
[0037] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned one embodiment, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection range of the utility model.
Claims
1. A plastic EGR valve characterized by, The application relates to a plastic valve, which comprises a plastic shell (1), a gear pin (2), a plastic bushing (3) and a valve seat (4), wherein the bottom end of the plastic shell (1) is provided with a channel (5), the upper end of the channel (5) is communicated with a mounting cavity (6) arranged at the upper end inside the plastic shell (1), the gear pin (2) is arranged in the mounting cavity (6), the plastic bushing (3) is arranged on the inner wall of the channel (5), the valve seat (4) is arranged on the inner wall of the channel (5) and below the plastic bushing (3), the gear pin (2), the plastic bushing (3) and the valve seat (4) are integrally injection molded with the plastic shell (1) as inserts, and the gear pin (2), the plastic bushing (3) and the valve seat (4) are all provided with anti-falling structures for preventing falling from the plastic shell (1).
2. The plastic EGR valve of claim 1, wherein, The anti-falling structure on the valve seat (4) comprises a plurality of limiting holes (7), each limiting hole (7) is arranged on the valve seat (4) along the axial direction of the valve seat (4), and a plurality of limiting holes (7) are distributed along the circumferential direction of the valve seat (4); an annular groove (8) is arranged on the inner wall of the channel (5), the valve seat (4) is arranged in the annular groove (8) and all the limiting holes (7) are located in the annular groove (8), and a plurality of limiting columns (9) are arranged in the limiting holes (7) in the annular groove (8).
3. The plastic EGR valve of claim 1 or 2, wherein, The anti-falling structure on the valve seat (4) comprises an annular limiting groove (10) arranged on the outer side wall of the valve seat (4), and a limiting ring (11) is arranged on the inner wall of the channel (5) in the annular limiting groove (10).
4. The plastic EGR valve of claim 1, wherein, The anti-falling structure on the gear pin (2) is knurling arranged on the outer wall of one end of the gear pin (2).
5. The plastic EGR valve of claim 1, wherein, The anti-falling structure on the plastic bushing (3) is a plurality of convex strips (12) arranged on the outer wall of the plastic bushing (3) and distributed along the circumferential direction of the outer wall of the plastic bushing (3).
6. The plastic EGR valve of claim 1, wherein, The inner wall of the channel (5) is further provided with a sealing ring (13) and a plastic heat shield (14), and the sealing ring (13) and the plastic heat shield (14) are sequentially arranged below the plastic bushing (3) from top to bottom.
7. The plastic EGR valve of claim 6, wherein, The plastic heat shield (14) is connected with the plastic shell (1) through welding.
8. The plastic EGR valve of claim 6, wherein, The sealing ring (13) comprises two upper and lower sealing rings, a framework (17) is arranged between the two sealing rings (13), and a through hole (18) communicated with the channel (5) is arranged on the side wall of the plastic shell (1) and corresponds to the framework (17).