Hot-end EGR (Exhaust Gas Recirculation) valve body

Abstract

The utility model discloses a hot end EGR valve body which comprises an EGR valve main body, a valve channel is arranged in the EGR valve main body, an exhaust channel is arranged on the lower portion of the EGR valve main body, a guide sleeve is arranged in the valve channel above an air inlet of the exhaust channel, and a sealing element is arranged above the guide sleeve. An annular cooling channel is arranged in the EGR valve main body above the exhaust channel, and the cooling channel is arranged on the peripheral side of the guide sleeve; a liquid inlet channel is further arranged on the outer wall of the EGR valve body located on the exhaust port side and communicates with the cooling channel on the corresponding side, and a liquid outlet pipe communicating with the cooling channel is arranged on the side, opposite to the exhaust port, of the EGR valve body. According to the EGR valve, the annular cooling channel surrounding the periphery of the guide sleeve is arranged in the EGR valve body, on one hand, the guide sleeve can be cooled in time, and on the other hand, waste gas in the exhaust channel can be preliminarily cooled, so that the situation that a sealing element is aged and damaged due to the fact that the temperature of the waste gas is too high is avoided, and the sealing performance of the valve body is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of EGR valve technology, specifically to a hot-end EGR valve body. Background Technology

[0002] The EGR valve is the actuator in the EGR system that regulates the flow rate of exhaust gas recirculation. The EGR valve is mainly installed between the engine exhaust system and the intake system. Its function is to control a certain amount of exhaust gas to re-enter the combustion chamber through its pipeline to participate in combustion, thereby reducing the emission of harmful substances such as nitrogen oxides and carbon dioxide.

[0003] Since the EGR valve is exposed to exhaust gas from the engine, and the exhaust gas is hot and contains impurities, the sealing elements inside the valve body will deform and fail due to prolonged exposure to high temperatures, affecting the sealing effect of the valve body. Therefore, it is necessary to cool and protect the sealing elements inside the valve body, and at the same time, minimize the exhaust gas temperature to reduce the high-temperature damage to the sealing elements during exhaust. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a hot-end EGR valve body with a built-in cooling channel to cool the inside of the valve body in a timely manner, so as to protect the sealing elements inside the valve body and avoid valve body seal failure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A hot-end EGR valve body includes an EGR valve body with a valve passage for assembling a valve stem inside. An exhaust passage is located at the lower part of the EGR valve body. A guide sleeve is located inside the valve passage above the exhaust passage's inlet to guide the valve stem and achieve linear movement of the valve stem. A sealing element is located above the guide sleeve. An annular cooling channel is located inside the EGR valve body above the exhaust passage, and the cooling channel is located around the guide sleeve. An inlet channel communicating with the coolant outlet of a cooler is also located on the outer wall of the EGR valve body on the exhaust port side. The inlet channel communicates with the cooling channel on the corresponding side. An outlet pipe communicating with the cooling channel is located on one side of the EGR valve body opposite the exhaust port.

[0007] The exhaust port of the exhaust passage in the aforementioned hot-end EGR valve body has a gradually expanding structure along the exhaust direction.

[0008] The aforementioned hot-end EGR valve body has a flange seat on the EGR valve body located on the exhaust port side, and the liquid inlet channel is provided through the flange seat. The EGR valve body is connected to the cooler through the flange seat.

[0009] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0010] This utility model provides a hot-end EGR valve body. By setting an annular cooling channel around the guide sleeve inside the EGR valve body, and the annular cooling channel being located above the exhaust channel, with the coolant inlet channel located on the exhaust port side, it can cool the guide sleeve in time, thereby protecting the sealing element above the guide sleeve and preventing the sealing element from being damaged by high temperature, thus affecting the seal. On the other hand, since the coolant inlet direction is completely opposite to the exhaust gas outlet direction, gas-liquid convection is formed inside the valve body, which can initially cool the exhaust gas in the exhaust channel, so as to avoid the exhaust gas temperature being too high and causing the sealing element to age and be damaged, thus ensuring the sealing performance of the valve body and preventing valve body seal failure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0012] Figure 2 This is a schematic diagram of the specific structure of the cooling channel described in this utility model;

[0013] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0014] The components are: 1. EGR valve body, 2. cooling channel, 3. liquid inlet channel, 4. liquid outlet pipe, 5. air inlet, 6. exhaust port, 7. flange seat, 8. exhaust channel, and 9. guide sleeve. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] A hot-end EGR valve body, such as Figures 1 to 3 As shown, the device includes an EGR valve body 1, a valve passage for assembling a valve stem is provided inside the EGR valve body 1, an exhaust passage 8 is provided at the lower part of the EGR valve body 1, a guide sleeve 9 is provided inside the valve passage above the exhaust passage inlet 5 to guide the valve stem and realize the linear movement of the valve stem, a sealing element is provided above the guide sleeve 9, and an annular cooling passage 2 is provided inside the EGR valve body 1 above the exhaust passage 8, and the cooling passage 2 is located around the guide sleeve 9.

[0017] In this embodiment, the cooling channel 2 is arranged in a square shape. In other embodiments, the cooling channel 2 can be arranged in a circular or other geometric annular structure.

[0018] An inlet channel 3 is also provided on the outer wall of the EGR valve body 1 located on the side of the exhaust port 6. The inlet channel 3 is connected to the cooling channel 2 on the corresponding side and is used to deliver coolant into the cooling channel.

[0019] A liquid outlet pipe 4 is provided on one side of the EGR valve body 1 opposite to the exhaust port 6, which is connected to the cooling channel 2 to discharge the cooled liquid and ensure that the cool liquid circulates in the cooling channel.

[0020] A flange seat 7 is provided on the EGR valve body 1 located on the side of the exhaust port 6. The liquid inlet channel 3 passes through the flange seat 7, and the EGR valve body 1 is connected to the cooler through the flange seat 7.

[0021] The exhaust port 6 is connected to the air inlet of the cooler, and the liquid inlet of the liquid inlet channel 3 is connected to the coolant outlet of the cooler, thereby forming gas-liquid convection to cool the high-temperature exhaust gas.

[0022] The exhaust port of exhaust channel 8 has a gradually expanding structure along the exhaust direction, which facilitates the rapid discharge of exhaust gas and reduces airflow loss.

[0023] In this embodiment, the inlet channel and the outlet pipe are misaligned. In other embodiments, the inlet channel and the outlet pipe may be arranged on the same axis.

[0024] When cooling is required inside the EGR valve, the coolant in the cooler is sent into the cooling channel through the inlet channel. Then, the coolant is split into two streams at the outlet of the inlet channel and flows to both sides of the annular channel to cool the inside of the valve body. Finally, the coolant flows into the inlet of the outlet pipe and is discharged through the outlet pipe. This provides initial cooling for the high-temperature exhaust gas entering the valve body, reduces the temperature of the high-temperature exhaust gas when it impacts the sealing elements, and prevents the sealing elements from being damaged by high temperatures.

[0025] This utility model provides a hot-end EGR valve body. By setting an annular cooling channel around the guide sleeve inside the EGR valve body, and the annular cooling channel being located above the exhaust channel, with the coolant inlet channel located on the exhaust port side, it can cool down the guide sleeve in time, protecting the sealing element above the guide sleeve from damage due to high temperature, thus affecting the seal. On the other hand, since the coolant inlet direction is completely opposite to the exhaust gas outlet direction, gas-liquid convection is formed inside the valve body, which can initially cool down the exhaust gas in the exhaust channel, preventing the sealing element from aging and being damaged due to excessively high exhaust gas temperature, thus ensuring the valve body's sealing performance and preventing valve body seal failure.

Claims

1. A hot-end EGR valve body, comprising an EGR valve body (1), wherein a valve passage for assembling a valve stem is provided inside the EGR valve body (1), an exhaust passage (8) is provided at the lower part of the EGR valve body (1), and a guide sleeve (9) is provided inside the valve passage above the exhaust passage inlet (5) to guide the valve stem and realize linear movement of the valve stem, and a sealing element is provided above the guide sleeve (9); characterized in that: An annular cooling channel (2) is provided inside the EGR valve body (1) located above the exhaust channel (8), and the cooling channel (2) is located on the periphery of the guide sleeve (9); an inlet channel (3) connected to the coolant outlet end of the cooler is also provided on the outer wall of the EGR valve body (1) located on the exhaust port (6), and the inlet channel (3) is connected to the cooling channel (2) on the corresponding side. An outlet pipe (4) connected to the cooling channel (2) is provided on the side of the EGR valve body (1) opposite to the exhaust port (6).

2. The valve body of a hot-end EGR valve according to claim 1, characterized in that: The exhaust port (6) of the exhaust channel (8) has a gradually expanding structure along the exhaust direction.

3. The valve body of a hot-end EGR valve according to claim 1, characterized in that: A flange seat (7) is provided on the EGR valve body (1) located on the side of the exhaust port (6). The liquid inlet channel (3) is provided through the flange seat (7). The EGR valve body (1) is connected to the cooler through the flange seat (7).

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