KR100991144B1 - Exhaust Gas Recirculation Valve - Google Patents

Abstract

The present invention includes a housing covering a solenoid driven by an electrical signal; The EGR valve is installed on the lower side of the housing and includes a mounting base for opening and closing the flow path formed for the entry and exit of the EGR gas in accordance with the operation of the solenoid and the communication portion connecting the housing and the mounting base, by entering and exiting the high temperature EGR gas It is related with the EGR valve which has a structure which reduces the heat load which generate | occur | produces.

To this end, the present invention forms a hole having the same diameter as the outer periphery of the communication portion in the center, the upper portion has a "U" shaped groove and is mounted on the lower plate provided on the upper portion of the mounting base, and the "U" shaped groove. A “U” shaped pipe through which coolant is circulated and a “U” shaped groove of the same shape are formed in the lower portion so as to correspond to the “U” shaped groove formed in the lower plate, and the hole having the same diameter as the outer circumferential edge of the communicating portion is formed in the center. It is characterized in that it is configured to include a top plate formed in and bonded to the bottom plate.

The present invention as described above to protect the configuration (weak solenoid valve, sensor, etc.) to the heat of the configuration of the EGR valve so that their normal operation can be maintained.

EGR, EGR Valve, NOx, PM, Automotive

Description

EBR valve with structure to reduce heat load {Exhaust Gas Recirculation Valve}

The present invention relates to an EGR valve having a structure for reducing heat load generated by the entry and exit of high temperature EGR gas.

As diesel engines have higher thermal efficiency and lower fuel consumption than gasoline engines, CO2 emissions, which are the main causes of global warming, are relatively low and high loads and high powers are possible as prime movers. In order to secure a position as a passenger car, a diesel engine having such advantages may be required to reduce emissions such as PM (particulate matter) and NOx (nitrogen oxide), which are relatively disadvantageous compared to gasoline engines.

The study of diesel engines aimed at developing low pollution, low fuel consumption, and high output engines that can cope with the emission gas environmental regulations have been carried out to reduce fuel consumption while simultaneously reducing them due to trade-off between NOx, PM, and fuel consumption in exhaust gas. Enhancement is a very difficult challenge. In recent years, research on these areas is being actively conducted due to stricter emission regulations.

Among them, NOx reduction technologies include delayed fuel injection timing, improved combustion chamber shape, improved fuel injection system, and EGR (exhaust gas recirculation), but the application of EGR system is becoming more common. EGR recirculates some of the exhaust gas back to the engine to reduce NOx. This EGR system replaces a part of the intake air with recycled exhaust gas, and the concentration of CO2 having a large specific heat increases to reduce the NOx production due to the temperature reduction during combustion. In addition, since the recycled exhaust gas replaces a part of the oxygen in the intake, NOx production is suppressed because the oxygen in the combustion chamber is reduced.

Until now, EGR valves have been used for mechanical devices, but as the exhaust regulations become more stringent, the use of electronic (EG) -EGR valves using electronic motors or solenoid valves for faster and more precise control is increasing.

However, the EGR ratio of these E-EGR valves should be small in high speed / high load areas where a large amount of NOx is generated, and small in the low speed area because the ratio of residual gas increases. In case of warming after cold start, precise control such as stopping EGR is necessary. Since the temperature of EGR gas can rise to 700 ℃ at full load, the thermal durability of E-EGR related parts (solenoid valve, motor, sensor, etc.) A thorough review is required, and a method and apparatus for lowering the temperature of the E-EGR valve are required for the smooth operation of the E-EGR related parts.

Conventionally, cooling was performed using cooling water to lower the temperature of the E-EGR valve. In order to flow the cooling water into the E-EGR valve, it was important to form a conduit in the E-EGR valve. Conventionally, various embodiments have been proposed to make such a conduit, but a common one was to perform additional operations such as drilling a hole, reinserting a pipe, and then blocking some holes again.

Therefore, it was difficult to maintain a close and stable coupling state between the E-EGR valve and the cooling water pipe, and both ends of the hole should be machined by turning, thus not only reducing productivity but also processing error due to turning, resulting in cooling water efficiency. This phenomenon of reduction was caused. In addition, the operation of drilling the hole, etc. had a disadvantage in that it is difficult to form a "U" shape.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to protect the components of the EGR valve vulnerable to high temperature due to the entry and exit of high temperature EGR gas EGR valve to maintain their normal operation To provide.

An object of the present invention as described above comprises a housing for covering a solenoid driven by an electrical signal; The EGR valve is installed on the lower side of the housing and includes a mounting base for opening and closing the flow path formed for the entry and exit of the EGR gas in accordance with the operation of the solenoid and the communication portion connecting the housing and the mounting base, the same as the outer peripheral edge of the communication portion A hole having a diameter in the center, the upper portion having a “U” -shaped groove, and a lower plate provided at an upper portion of the mounting base, and a “U” -shaped pipe seated in the “U” -shaped groove and having coolant circulated therein; The upper plate may be formed at the bottom to form a “U” shaped groove having the same shape to correspond to the “U” shaped groove formed in the lower plate, and to form a hole having the same diameter as the outer circumferential edge of the communication unit in the center and to be coupled to the lower plate. It is achieved by the EGR valve which has a structure which reduces the heat load characterized by the above-mentioned.

In the present invention, it is preferable to interpose an insulator between the lower plate and the upper plate to prevent heat conducted to the upper plate from being transferred to the upper plate.

In addition, both sides of the lower plate forms a threaded coupling groove, and both sides of the corresponding upper plate forms a threaded through-hole so that the coupling of the upper plate and the lower plate is coupled by bolting fastening.

In addition, the lower surface of the upper plate, or the upper surface of the lower plate, or the lower surface of the upper plate and the upper surface of the lower plate is characterized in that the embossing (embossing), such embossing may be made of a semi-circular, or polygonal.

According to the EGR valve having a structure for reducing the heat load according to the present invention, the EGR valve is operated by providing ease of processing and assembly, improving the cooling efficiency of the EGR valve in contrast to the conventional technology, and blocking the malfunction of the EGR valve. It is effective to keep it for a long time.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention will be described in detail.

The present invention includes a housing 10 for covering a solenoid driven by an electrical signal, and a mounting base 30 installed at a lower side of the housing 10 and opening and closing a flow path formed for entry and exit of EGR gas according to the driving of the solenoid. And it relates to an EGR valve comprising a communication portion 20 for connecting the housing 10 and the mounting base 30, the configuration of the present invention is largely provided with a lower plate 60 provided on the upper portion of the mounting base (30) and And an upper plate 40 covering the upper portion of the lower plate 60 to accommodate the “U” shaped pipe 50 seated on the upper portion of the lower plate 60. .

The lower plate 60 has a structure having a flat upper portion, and a hole 61 having the same diameter as the outer circumference of the communicating portion 20 is formed at the center of the flat surface. In addition, the plane of the lower plate 60 forms a "U" -shaped groove 62, such a "U" -shaped groove 62 is formed horizontally on the plane of the lower plate 60 to surround the hole 61. do.

The “U” shaped pipe 50 is mounted in the “U” shaped groove 62 and is connected to a coolant tank (not shown) provided in a vehicle to allow the coolant to circulate to the EGR valve side.

The lower portion of the upper plate 40 is a structure having a plane having the same area as the upper portion of the lower plate 60, in addition to the "U" -shaped groove (62) to correspond to the "U" -shaped groove 62 formed in the lower plate (60) 42). That is, the "U" -shaped grooves 42 and 62 of the lower part of the upper plate 40 and the upper part of the lower plate 60 are formed to accommodate the "U" -shaped pipe 50, and the "U" -shaped pipe 50 It is formed to fit the diameter of).

In addition, the upper plate 40 forms a hole 41 having the same diameter as the outer periphery of the communication portion 20 at a position corresponding to the hole 61 of the lower plate 60.

In addition, both sides of the lower plate 60 forms a threaded coupling groove 63, and both sides of the upper plate 40 corresponding to the upper plate 40 form threaded through holes 43 to form the upper plate 40 and the lower plate ( The coupling of 60 may be coupled by bolting fastening using bolts 91.

On the other hand, between the lower plate 60 and the upper plate 40 is configured through the insulator 70 to prevent the heat conducted to the lower plate 60 from being transferred to the upper plate (40). This is for blocking heat when the heat is conducted to the lower plate 60 by the mounting base 30 through which the EGR gas enters. Both sides of the insulator 70 are bolted together with the lower plate 60 and the upper plate 40. The hole 71 is formed. Therefore, since the heat conducted to the lower plate 60 is not transmitted to the upper plate 40, the solenoid and the sensor provided in the housing 10, which are weak in heat, may perform a smooth operation.

In addition, the present invention in addition to the insulator 70 in order to block the heat transferred from the mounting base 30, the lower surface of the upper plate 40, or the upper surface of the lower plate 60, or lower portion of the upper plate 40 Embossing the upper surface of the surface and the lower plate 60 (embossing), this embossing form may be made of a semi-circular, polygonal or the like. Therefore, the contact area between the upper plate 40 and the lower plate 60 is reduced, the thermal conductivity can be seen to be lowered.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will readily occur to those skilled in the art without departing from the spirit and scope of the invention. Therefore, it should be understood that the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense, and that the true scope of the invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof, .

1 is a view showing a conventional EGR valve,

2 is a view showing an EGR valve according to an embodiment of the present invention,

3 is an exploded perspective view of FIG. 2;

4 is an exploded perspective view of an EGR valve according to another embodiment of the present invention,

5 is an exploded perspective view of an EGR valve according to another embodiment of the present invention;

6 is an exploded perspective view of the EGR valve according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: housing 20: communication part

30: mounting base 40: top plate

50: "U" shaped pipe

60: lower plate 41, 61: hall

42, 62: "U" groove 43: through hole

63: coupling groove 70: insulator

Claims (5)

A housing 10 covering the solenoid driven by an electrical signal; The communication unit 20 is installed below the housing 10 and connects the mounting base 30 and the housing 10 and the mounting base 30 to open and close a flow path formed for entry and exit of the EGR gas according to the driving of the solenoid. In an EGR valve comprising A hole 61 having the same diameter as the outer circumference of the communication portion 20 is formed in the center, and the upper portion has a “U” -shaped groove 62 and is provided on the upper portion of the mounting base 30. and; A “U” shaped pipe 50 seated in the “U” shaped groove 62 and having a cooling water circulated therein; A “U” shaped groove 42 having the same shape is formed at a lower portion so as to correspond to the “U” shaped groove 62 formed in the lower plate 60, and a hole 41 having the same diameter as the outer circumferential edge of the communication portion 20. The upper plate 40 to form a center in combination with the lower plate 60; EGR valve having a structure for reducing the heat load, characterized in that comprising a. The method of claim 1, Between the lower plate 60 and the upper plate 40 to reduce the heat load, characterized in that through the insulator 70 to prevent the heat conducted to the lower plate 60 from being transferred to the upper plate 40 EGR valve with. The method of claim 1, On both sides of the "U" -shaped groove 62 of the lower plate 60 to form a coupling groove 63 penetrating the upper and lower portions of the lower plate 60 and formed a thread on the inner circumferential surface, On both sides of the "U" -shaped groove 42 of the upper plate 40 to form a through hole 43 penetrating the upper and lower portions of the upper plate 40 and forming a screw thread on the inner circumferential surface, EGR valve having a structure for reducing the heat load, characterized in that the coupling of the upper plate (40) and the lower plate (60) is coupled to the coupling groove (63) and the through hole (43) by bolting. The method of claim 1, The lower surface of the upper plate 40, or the upper surface of the lower plate 60, or the lower surface of the upper plate 40 and the upper surface of the lower plate 60 is embossed (embossed) structure to reduce the heat load EGR valve with. The method of claim 4, wherein The embossing EGR valve having a structure for reducing heat load, characterized in that consisting of a semi-circular, or polygonal.

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