CN210660365U

CN210660365U - Integrated EGR cooling system

Info

Publication number: CN210660365U
Application number: CN201921225414.9U
Authority: CN
Inventors: 覃海玉; 王冲有; 蒙小聪
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-06-02
Anticipated expiration: 2029-07-31

Abstract

The utility model relates to a diesel engine annex technical field, concretely relates to integrated form EGR cooling system, including the EGR disk seat, set up waste gas entry, exhaust outlet, delivery port, water inlet, EGR valve mount pad and EGR cooler connecting seat on the EGR disk seat, waste gas entry and exhaust outlet intercommunication, still including setting up the cooling jacket inside the EGR disk seat, the section shape of cooling jacket along the direction of admission is arc and arc length is greater than the arc length of the same radial semicircle, cooling jacket's one end and water inlet intercommunication, cooling jacket's the other end and the tangent intercommunication of delivery port, the delivery port with the cooling entry intercommunication of EGR cooler, exhaust outlet with the exhaust gas channel intercommunication of EGR cooler. The utility model discloses built-in cooling jacket of EGR disk seat forms the series connection water route with EGR cooler cooling channel, and the integrated level is high, reduces and leaks the risk, compact structure, and the coolant liquid encircles disk seat and velocity of flow soon, and the cooling effect is good.

Description

Integrated EGR cooling system

Technical Field

The utility model relates to a diesel engine annex technical field, concretely relates to integrated form EGR cooling system.

Background

With the increasing requirements of emission regulations, the regulations put higher requirements on the emission of engines, and most engines adopt EGR technical schemes. EGR applications include cold-end RGR and hot-end EGR, where cold-end EGR is: the exhaust gas is cooled by the cooler and then passes through the EGR valve, and the application mode has the defects of slow control response and easy carbon deposition to cause clamping failure of the EGR valve; the hot end valve is as follows: exhaust gas directly passes through the EGR valve without cooler cooling, and this kind of application mode control response is fast, avoid the carbon deposit scheduling problem, nevertheless because exhaust gas is high without cooler cooling temperature, and it is big to the electrical component heat radiation of EGR valve, and the EGR valve has the risk of scaling loss inefficacy.

To solve the above problems, a cooling structure may be integrated on an EGR valve seat, as in chinese patent: CN204941729U discloses an EGR valve seat with cooling water channel, comprising: the cooling water pipe comprises a first flange, a second flange, a cooling water pipe and a cooling water channel; the first flange and the second flange are coaxially connected, and a transition part is formed at the intersection joint; the first flange is connected with the EGR valve, and the second flange is connected with the exhaust manifold; the first flange and the second flange are provided with through holes along the axis; the cooling water pipe is connected with the transition part, and the axis of the cooling water pipe is vertical to the axes of the first flange and the second flange; the cooling water channel is arranged in the transition part and is connected with the cooling water pipe. The effectual above-mentioned problem of having solved, but this structure still has certain problem, and inlet tube and drain pipe adopt coaxial arrangement, and EGR disk seat length is great, and the coolant liquid velocity of flow is slow, and the cooling effect is not good.

In addition, the application of the engine hot end EGR valve generally adopts the mode that an independent cooling water path is arranged on a valve seat to cool the waste gas inlet, the EGR valve is connected with an EGR cooler cooling water path in parallel or connected in series through a pipeline, the arrangement of the engine cooling water path is complex, the leakage hidden danger of a plurality of interfaces is large, the assembly manufacturability is poor, and the part cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides an integrated form EGR cooling system, built-in cooling jacket of EGR disk seat forms the series connection water route with EGR cooler cooling channel, and the integrated level is high, reduces and leaks the risk, compact structure, and the coolant liquid encircles disk seat and velocity of flow fast, and the cooling effect is good.

The technical scheme of the utility model as follows: including the EGR disk seat, set up and be in waste gas entry, exhaust outlet, delivery port, water inlet, EGR valve mount pad and EGR cooler connecting seat on the EGR disk seat are installed the EGR valve on the EGR valve mount pad installs the EGR cooler on the EGR cooler connecting seat, waste gas entry with the exhaust outlet intercommunication is still including setting up the inside cooling jacket of EGR disk seat, cooling jacket is greater than the arc length of same radial semicircle for arc and arc length along the section shape of direction of admitting air, cooling jacket's one end with the water inlet intercommunication, cooling jacket's the other end and the tangent intercommunication of delivery port. The arc length of cooling jacket is greater than the arc length of the same radial semicircle, makes EGR valve circumferencial direction realize furthest's effective cooling, avoids high temperature radiation EGR valve's electric elements, has avoided delivery port and water inlet to arrange again on the diameter direction of EGR disk seat, and the whole length of intaking and play water connection structure is short, compact structure, cooling jacket is tangent with the delivery port, is favorable to reducing the cooling water flow resistance, and rivers are fast, and the cooling effect is better.

The water outlet is communicated with a cooling inlet of the EGR cooler, and the exhaust gas outlet is communicated with an exhaust gas channel of the EGR cooler. On the overall arrangement structure of the water path, a cooling water jacket is arranged in the EGR valve seat to form a series water path with a cooling channel of the EGR cooler, waste gas is primarily cooled by the cooling water jacket when passing through the EGR valve, the temperature of the waste gas after primary cooling can be reduced to be within the temperature resistance limit value of the EGR valve, the waste gas after primary cooling enters the EGR cooler through the gas outlet to be secondarily cooled, heat exchange between the waste gas and cooling water is carried out again, and the cooling effect is better; the cooling water jacket is connected with the EGR cooler in series through the water channel, the connecting structure is simple and compact, the integration level is high, and leakage caused by too many parts is avoided.

Preferably, the waste gas inlet, the waste gas outlet the delivery port the water inlet EGR valve mount pad and EGR cooler connecting seat with EGR disk seat integrated into one piece adopt aluminum alloy material casting shaping, multi-functional integrated design, the integrated level is higher, and intensity is better, has avoided the many big problems of hidden danger of leaking of interface, has simplified technology.

Preferably, EGR valve mount pad and EGR cooler connecting seat are flange structure, simple structure, and it is convenient, intensity is high, sealing performance is good to dismantle.

Preferably, the water outlet is arranged on the outer wall of the exhaust gas outlet, and the water outlet and the exhaust gas outlet are arranged on the same side of the EGR valve seat, so that the exhaust gas can be continuously cooled in the process of flowing to the EGR cooler, and the cooling effect is better.

The utility model has the advantages that:

1. the built-in cooling water jacket of EGR disk seat forms the water route of establishing ties with EGR cooler cooling channel, and the integrated level is high, reduces and leaks the risk, compact structure, and the coolant liquid encircles the disk seat and the velocity of flow is fast, and the cooling effect is good.

2. The cooling water jacket ensures that the cooling of waste gas is not influenced, the cooling of the EGR valve at the hot end of the engine is ensured, the whole length of the water inlet and outlet connecting structure is short, the structure is compact, the cooling water jacket is tangent to the water outlet, the improvement of the water outlet speed is facilitated, and the cooling effect is better.

Drawings

Fig. 1 is a schematic view of an installation structure of an integrated EGR cooling system according to the present invention.

Fig. 2 is a schematic sectional structure diagram of the EGR valve seat of the present invention.

Fig. 3 and 4 are schematic perspective views of the EGR valve seat according to the present invention.

In the figure: 1. an exhaust gas inlet; 2. a water inlet; 3. a cooling water jacket; 4. an EGR valve mounting seat; 5. a water outlet; 6. an EGR cooler connection seat; 7. an exhaust gas outlet; 8. an EGR valve seat; 9. an EGR cooler; 10. an EGR valve; 11. and (4) exhausting the gas.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

example 1:

as shown in fig. 1, 2 and 3, an integrated EGR cooling system includes an EGR valve seat 8, an exhaust gas inlet 1, an exhaust gas outlet 7, a water outlet 5, a water inlet 2, an EGR valve mounting seat 4 and an EGR cooler connecting seat 6 provided on the EGR valve seat 8, an EGR valve 10 mounted on the EGR valve mounting seat 4, an EGR cooler 9 mounted on the EGR cooler connecting seat 6, the exhaust gas inlet 1 is communicated with the exhaust gas outlet 7, and further comprises a cooling water jacket 3 arranged inside the EGR valve seat 8, the section of the cooling water jacket 3 along the air inlet direction is arc-shaped, the arc length is greater than that of a semi-arc with the same radius, one end of the cooling water jacket 3 is communicated with the water inlet 2, the other end of the cooling water jacket 3 is communicated with the water outlet 5 in a tangent way, the water outlet 5 is communicated with a cooling inlet of the EGR cooler 9, and the exhaust gas outlet 7 is communicated with an exhaust gas channel of the EGR cooler 9.

The working principle of the embodiment is as follows:

as shown in fig. 4, the EGR valve 10 is mounted on the EGR valve mounting seat 4, the opening degree of the EGR valve is controlled by the engine ECU, the EGR valve has fast response, which is beneficial to realizing optimal performance and emission, the EGR cooler 9 is mounted on the EGR cooler connecting seat 6, and the water outlet 5 is connected with the coolant inlet of the EGR cooler 9; high-temperature waste gas discharged by an exhaust pipe 11 directly passes through an EGR valve 10, the waste gas is primarily cooled by a surrounding cooling water jacket 3 when passing through the EGR valve 10, the temperature of the primarily cooled waste gas can be reduced to be within the temperature resistance limit value of the EGR valve 10, and the primarily cooled waste gas enters an EGR cooler 9 through a gas outlet in an EGR cooler connecting flange for secondary cooling; therefore, the cooling water jacket 3 and the EGR cooler 9 are connected in series through a water channel, cooling water passing through the cooling water jacket 3 enters the EGR cooler 9 through the water outlet 5, and heat exchange between exhaust gas and the cooling water is carried out again.

Example 2:

as shown in fig. 1, 2 and 3, in an integrated EGR cooling system, an EGR valve 10 is mounted on an EGR valve mounting seat 4, an EGR valve seat 8 is arranged at the hot end of an engine, and exhaust gas directly passes through the EGR valve seat 8 without being cooled, so that the application mode has fast control response and avoids the problems of carbon deposition and the like; an integrated form EGR cooling system include EGR disk seat 8, set up and be in waste gas entry 1, exhaust outlet 7, delivery port 5, water inlet 2, EGR valve mount pad 4 and EGR cooler connecting seat 6 on the EGR disk seat 8, exhaust gas entry 1 connects blast pipe 11, and waste gas passes through waste gas entry 1 and gets into EGR disk seat 8, and EGR cooler connecting seat 6 is connected with EGR cooler 9, waste gas entry 1 with exhaust outlet 7 is in the inside intercommunication of EGR disk seat 8, delivery port 5 and water inlet 2 are at EGR disk seat 8 internal connection, delivery port 5 with the cooling entry intercommunication of EGR cooler 9, exhaust outlet 7 with the exhaust gas passage intercommunication of EGR cooler 9.

Fig. 2 shows the utility model discloses an integrated form EGR cooling system's inner structure cross-sectional view has expressed cooling jacket 3 and delivery port 5's structure, cooling jacket 3 sets up inside EGR disk seat 8, cooling jacket 3 is greater than the arc length of the semicircle of the same radius for arc and arc length along the section shape of direction of admitting air, is "C" shape structure, cooling jacket 3's one end with 2 intercommunications of water inlet, cooling jacket 3's the other end and the tangent intercommunication of delivery port 5, cooling jacket 3 with 5 shapes of delivery port present approximate "9" font structure.

As shown in fig. 2 and 3, in a further aspect of the present embodiment, the exhaust gas inlet 1, the exhaust gas outlet 7, the water outlet 5, the water inlet 2, the EGR valve mounting seat 4, and the EGR cooler connecting seat 6 are formed integrally with the EGR valve seat 8, and are cast from an aluminum alloy material.

In a further scheme of the embodiment shown in fig. 2 and 3, the EGR valve mounting seat 4 and the EGR cooler connecting seat 6 are both flange structures, and have the advantages of simple structure, convenience in disassembly, high strength and good sealing performance.

As shown in fig. 2, in a further aspect of the present embodiment, the water outlet 5 is disposed on an outer wall of the exhaust gas outlet 7, and the water outlet 5 and the exhaust gas outlet 7 are disposed on the same side of the EGR valve seat.

The working principle of the embodiment is as follows:

Claims

1. The utility model provides an integrated form EGR cooling system, includes EGR disk seat (8), sets up exhaust gas inlet (1), exhaust outlet (7), delivery port (5), water inlet (2), EGR valve mount pad (4) and EGR cooler connecting seat (6) on the EGR disk seat (8) are installed EGR valve (10) on EGR valve mount pad (4), EGR cooler (9) installed on EGR cooler connecting seat (6), exhaust gas inlet (1) with exhaust outlet (7) intercommunication, its characterized in that: the EGR valve seat is characterized by further comprising a cooling water jacket (3) arranged inside the EGR valve seat (8), the section shape of the cooling water jacket (3) along the air inlet direction is arc-shaped, the arc length of the cooling water jacket (3) is larger than that of a semi-arc with the same radius, one end of the cooling water jacket (3) is communicated with the water inlet (2), the other end of the cooling water jacket (3) is communicated with the water outlet (5) in a tangent mode, the water outlet (5) is communicated with a cooling inlet of the EGR cooler (9), and the waste gas outlet (7) is communicated with a waste gas channel of the EGR cooler (9).

2. The integrated EGR cooling system of claim 1 wherein: the exhaust gas inlet (1), the exhaust gas outlet (7), the water outlet (5), the water inlet (2), the EGR valve mounting seat (4), the EGR cooler connecting seat (6) and the EGR valve seat (8) are integrally formed.

3. An integrated EGR cooling system according to claim 1 or 2, wherein: the EGR valve mounting seat (4) and the EGR cooler connecting seat (6) are both of flange structures.

4. An integrated EGR cooling system according to claim 1 or 2, wherein: the water outlet (5) is arranged on the outer wall of the waste gas outlet (7).